| ABB OY Patent applications |
| Patent application number | Title | Published |
|---|
| 20120126049 | METHOD AND ARRANGEMENT IN CONNECTION WITH WINDER DRIVE - A method and arrangement are provided in connection with a continuous material web, which runs from an unwinder to a winder, at least one of which being a center winder. The method includes providing an initial value for density of a material on the center winder, calculating a moment of inertia for a roll of material on the center winder, determining tightness of the material web, producing a correction term for torque calculation based on a material web tightness reference, the material web tightness and the moment of inertia of the roll of material, calculating a torque reference based on the produced correction term and the calculated moment of inertia of the roll of material, and controlling the torque of the center winder based on the torque reference. The method also includes correcting the density value of the material on the center winder based on the produced correction term. | 05-24-2012 |
| 20120123715 | METHOD AND ARRANGEMENT FOR DETERMINING INDUCTANCES OF SYNCHRONOUS RELUCTANCE MACHINE - A method and an arrangement of determining inductances of a synchronous reluctance machine are provided. The method includes supplying a voltage pulse in the quadrature-axis or direct-axis direction of rotor, sampling currents generated by the supplied voltage pulse, and calculating values of flux at the sampling instants from the value of the supplied voltage pulse, the sampled current values and a value of the stator resistance. The method also includes calculating synchronous inductance of the machine by dividing the calculated flux values by the corresponding sampled currents, and/or calculating transient inductance of the machine as a derivative of the flux with respect to current, and storing the calculated values as a function of current. | 05-17-2012 |
| 20120120698 | SWITCHING BRANCH FOR THREE-LEVEL CONVERTER AND METHOD FOR CONTROLLING SWITCHING BRANCH OF THREE-LEVEL CONVERTER - Exemplary embodiments for controlling a switching branch for a three-level converter, and a switching branch are disclosed. A first semiconductor switch and a second semiconductor switch, a first diode and a second diode, a third semiconductor switch and a fourth semiconductor switch, a third diode, and a fourth diode, a fifth semiconductor switch and a sixth semiconductor switch, a fifth diode, and a sixth diode, and a control arrangement for controlling the semiconductor switches are provided. The first semiconductor switch, the first diode, the fifth semiconductor switch and the fifth diode reside in a first switching branch-specific semiconductor module, and the fourth semiconductor switch, the fourth diode, the sixth semiconductor switch and the sixth diode reside in a second switching branch-specific semiconductor module. | 05-17-2012 |
| 20120119712 | CONTROL METHOD FOR DOUBLY-FED ELECTRIC GENERATOR - Exemplary embodiments provide a method of controlling a doubly-fed electric generator using a frequency converter having a torque and flux controller. The frequency converter is connected to a rotor of the generator. The frequency converter calculates a stator flux positive sequence component from a stator flux. A rotor flux amplitude reference and an estimated torque is then calculated by using the stator flux positive sequence component. The frequency converter selects a voltage vector to steer the rotor flux by using the rotor flux amplitude reference and the estimated torque. | 05-17-2012 |
| 20120099347 | FREQUENCY CONVERTER ASSEMBLY - A frequency converter assembly including an input for supplying electric power having an input frequency into the frequency converter assembly from a supply network, a direct voltage intermediate circuit having capacitor component, and at least one controllable switch. The switch being electrically positioned between the input and the direct voltage intermediate circuit. The assembly also includes an output for supplying electric power having an output frequency from the frequency converter assembly, and control component arranged to control the at least one controllable switch. The control component provides a recovery function to recover the capacitor component by supplying restricted recovery current from the supply network to the capacitor component through the at least one controllable switch, the control means also prevents supply of electric power from the direct voltage intermediate circuit towards the output during the recovery function. | 04-26-2012 |
| 20120098377 | ARRANGEMENT FOR ATTACHING A MAGNET TO A ROTOR, AND A ROTOR - In an arrangement in accordance with the invention for attaching a permanent magnet to an electrical machine's rotor, the rotor comprises at least two magnetic poles, and there is a pole gap between two magnetic poles. Permanent magnets are installable on the surface of the magnetic core. A pole piece is installable on the permanent magnet side facing the air gap. There is fixing means on the sides of the pole piece facing the pole gap for attaching the pole piece to the rotor using the locking parts, and the fixing means are connected to the pole piece through an articulated joint. | 04-26-2012 |
| 20120092914 | SWITCHING BRANCH FOR THREE-LEVEL RECTIFIER AND METHOD FOR CONTROLLING SWITCHING BRANCH FOR THREE-LEVEL RECTIFIER - A switching branch for a three-level rectifier and a method for controlling a switching branch for a three-level rectifier are provided. The switching branch includes a first diode and a second diode connected in series, a third diode and a fourth diode connected in series, a first controllable switch connected between a neutral DC output pole and a connection point between the first and the second diode, and a second controllable switch connected between the neutral DC output pole and a connection point between the third and the fourth diode. The switching branch includes means for controlling the first controllable switch to be in a conductive state during a reverse blocking state of the first diode and the second diode, and means for controlling the second controllable switch to be in a conductive state during a reverse blocking state of the third diode and the fourth diode. | 04-19-2012 |
| 20120086289 | ROTOR OF A SYNCHRONOUS RELUCTANCE MACHINE AND THE METHOD FOR MANUFACTURING THE ROTOR OF A SYNCHRONOUS RELUCTANCE MACHINE - A rotor is disclosed for a synchronous reluctance machine which includes an axis, which is supported by bearings to rotate inside a stator, and to which axis a rotor frame has been attached. The frame can be made of magnetically non-conductive material, having arranged magnetically conductive bar-shaped objects which extend through the rotor frame from the outer surface of the magnetic pole of the rotor to the outer surface of the pole. The whole length of each bar-shaped object inside the rotor frame can be surrounded by non-magnetic material. | 04-12-2012 |
| 20120072868 | FREQUENCY CONVERTER WITH TEXT EDITOR - A frequency converter includes a symbol string editor in which the potential input symbols are grouped into at least two symbol lists. One of the lists is treated as a current symbol list, which can be scrolled and from which the symbols can be selected as the user input. In addition, a user is allowed to control change of the current symbol list such that the symbols in all of the symbol lists are available for selection. This arrangement allows for scrollable lists to be significantly shorter than a single list of potential symbols would be, which makes entering symbol strings faster. | 03-22-2012 |
| 20120044730 | LINE AND NEUTRAL POINT CLAMPED INVERTER - Exemplary embodiments are directed to an inverter and a method for controlling an inverter. The inverter includes a DC link having two capacitor units in series and a neutral point between the capacitor units, and a first and a second inverter leg. Both inverter legs are connected between the poles of the DC link and include four switching devices connected in series. Both inverter legs include an upper connection point between the two topmost switching devices, a lower connection point between the two bottommost switching devices, and an output between the two middle switching devices. Both inverter legs further include a first rectifier device connected between the DC link neutral point and the leg upper connection point, and a second rectifier device connected between the DC link neutral point and the leg lower connection point. Both inverter legs further include a third rectifier device connected between the upper connection point of the leg and the output of the other leg, and a fourth rectifier device connected between the output of the leg and the lower connection point of the other leg. | 02-23-2012 |
| 20120044717 | TRANSFORMER-ISOLATED SWITCHING CONVERTER - Exemplary systems and methods provide a transformer-isolated current-fed quadratic full-bridge converter topology. The optimal interfacing of a current source, such as a solar panel, can be implemented by using current-fed converters. The current-fed converter can operate within the whole range of a UI curve from short-circuit to open-circuit condition and its input voltage can be readily controlled. The quadratic behaviour between input and output in regard of a duty cycle allows large conversion ratios. | 02-23-2012 |
| 20120029844 | DETERMINING ELASTIC MODULUS FOR CONTINUOUS MATERIAL WEB - A method and apparatus are disclosed for determining elastic modulus for a continuous material web, in which method a continuous material web runs on a roll driven by an electric motor drive. The method includes determining material web speed v | 02-02-2012 |
| 20120008356 | CURRENT-FED CONVERTER - A converter circuit includes first and second input terminals for receiving input current from a current source, a first capacitor connected between the first and second input terminals, a second capacitor having a first terminal of which is connected to the second input terminal and a second terminal which forms a positive voltage node, and first and third semiconductor components connected in series between the first input terminal and a positive voltage node, where the midpoint between the series connection forms a first node. The converter circuit includes first inductive component connected between the second input terminal and first node, second and fourth semiconductor components connected in series in parallel with the series connection first and third semiconductor components, a second inductive component having a first end which is connected to a second node formed between the second and fourth semiconductor components and a second end which produces a first output terminal, where the second output terminal is formed of the first input terminal. The first and the third semiconductor components are configured to control the voltage between the first and second input terminals. | 01-12-2012 |
| 20120007576 | CURRENT-FED CONVERTER - A converter circuit includes first and second input terminals for receiving an input current from a current source, a first capacitor connected between the first and second input terminals, a second capacitor having a first terminal which is connected to the second input terminal and a second terminal forming a positive voltage node. First and third semiconductor components are connected in series between the first input terminal and the positive voltage node to form a first node. A series connection of a first inductive component, a first diode and a second inductive component is connected between the second input terminal and the first node. A third capacitor and a third inductive component are included, as are first and second output terminals. The first and the third semiconductor components are configured to control the voltage between the first and second input terminals. | 01-12-2012 |
| 20120001508 | PERMANENT MAGNET ELECTRIC MACHINE AND PERMANENT MAGNET FOR AN ELECTRIC MACHINE - The disclosure relates to an electric machine with a permanent magnet rotor, where permanent magnets have been fitted on an outer surface of a cylindrical rotor, and relates to a permanent magnet. The permanent magnets forming the electric machine's rotor pole are shaped so that the electric machine's air gap is substantially constant in a middle of the pole, and the air gap increases in an essentially straightforward manner when moving towards the edge of the pole. The permanent magnet is of an even thickness in the middle, and becomes thinner towards the edges. This can result in a decrease in the torque ripple and cogging torque of an electric machine. | 01-05-2012 |
| 20110320073 | METHOD AND ARRANGEMENT FOR CONTROLLING ENERGY CONSUMPTION IN A MARINE VESSEL - An apparatus and a method are disclosed for controlling energy consumption in a marine vessel having a plurality of energy consuming users and fuel consuming engines. An exemplary apparatus includes a voyage management tool for planning a route for the marine vessel and for estimating energy consumption on the route; an energy management tool for predicting energy consumption; and control tool for managing an energy balance on the route. | 12-29-2011 |
| 20110298470 | DETECTION OF WELDED SWITCH CONTACTS IN A LINE CONVERTER SYSTEM - A system for the detection of welded contacts in a circuit of a line converter system has a plurality of inverter switches, a plurality of utility switches in which a pair of utility switches is connected in series through a line to a utility, a voltage detector, an electronic controller, and a DC input source. The line converter system converts incoming DC power into AC output power that is delivered to the utility grid. The voltage detector measures the voltage across a first node and a second node of the circuit and provides an output that is interpreted by an electronic controller for each step performed during a method of detection of welded contacts. The detection method has a sequence of test steps in which at least one switch is opened and/or closed, a DC bus of the inverter or the utility grid is used as a stimulus voltage, and the voltage is measured. If a voltage is not detected across the first and second nodes, the test sequence is continued until a welded contact is detected or the electronic controller determines that none of the contacts are welded. If the controller determines that none of the contacts are welded, the line converter system is permitted to connect and supply AC power to the utility. | 12-08-2011 |
| 20110298282 | METHOD AND ARRANGEMENT FOR BALANCING VOLTAGES OF SERIES CONNECTION OF STORAGE UNITS FOR ELECTRICAL ENERGY - An arrangement which includes two or more energy storage units for electrical energy connected in series, and two or more balancing resistor units. Each balancing resistor unit is connected in parallel with one of the energy storage units. The arrangement also includes means for determining a voltage over all of the series-connected energy storage units and means for determining the energy storage unit voltages between poles of the energy storage units. One or more of the balancing resistor units include a base resistor unit and a control resistor unit connected in series and a switching device connected in parallel with the control resistor units. The arrangement further comprises means for determining reference voltages for the energy storage units based on the voltage over all of the series-connected capacitors and means for controlling the switching device to control the resistance of one or more of the balancing resistor units so that the energy storage unit voltage of each energy storage unit is maintained within a set range of the reference voltage for each energy storage unit. | 12-08-2011 |
| 20110276279 | FAULT DIAGNOSTICS ARRANGEMENT FOR ELECTRIC DRIVE SYSTEM, AND ELECTRIC DRIVE SYSTEM - An exemplary electric drive system has a plural number of electric drive subsystems. Each subsystem having a fault diagnostics arrangement, where the arrangement includes a respective control board for each subsystem. Event data of each subsystem is recorded on the respective control board, and one of the respective control boards of the electric drive system is a main control board of the electric drive system. Event data of a subsystem is transferred from the respective control board to the main control board through a data transfer medium. | 11-10-2011 |
| 20110272319 | OUTDOOR ENCLOSURE FOR ELECTRONIC EQUIPMENT AND METHOD FOR PROVIDING AN OUTDOOR ENCLOSURE FOR ELECTRONIC EQUIPMENT - An enclosure and method for arranging an enclosure provides a robust and inexpensive enclosure for protection against gun fire and high temperature variations, in which method an enclosure having an inner shell and an outer shell en-closing the inner shell at a clearance thereof is formed, whereby a cavity is formed between the shells. Electrical equipment can be enclosed within the inner shell. Natural granular absorption material can be provided as the protective layer into the cavity on site upon installation of the enclosure. | 11-10-2011 |
| 20110271891 | MOORING WINCH AND A METHOD FOR CONTROLLING A CABLE OF A MOORING WINCH - An electrically driven mooring winch is provided. The mooring winch includes a winding drum, an AC motor configured to drive the winding drum, a frequency conversion unit connected to the AC motor, and a control unit configured to control the frequency conversion unit on the basis of an indicator for tension of the mooring rope. The control unit is configured to set a reference value of rotational speed of the AC motor to a predetermined value, drive the AC motor in one direction for a predetermined time interval, define a first value of a torque of the AC motor, drive the AC motor in an opposite direction for the predetermined interval, define a second value of the torque of the AC motor, and compute a torque estimate using the first and second values of the torque. | 11-10-2011 |
| 20110265975 | MOUNTING BASE - The disclosure relates to a mounting base for an electric component, including, for example, first surface for receiving the electric component, and for receiving a heat load generated by the electric component, and a second surface for dissipating heat from the mounting base. The mounting base can include evaporator channels arranged in the vicinity of the first surface, condenser channels in the vicinity of the second surface and a first and second connecting part for passing fluid between the condenser channels and evaporator channels. | 11-03-2011 |
| 20110254493 | METHOD AND ARRANGEMENT IN CONNECTION WITH ELECTRIC DEVICE SYSTEM - A method and arrangement in connection with an electric drive system are provided. The electric drive system includes an intermediate circuit with two or more supply units and two or more inverter units connected thereto, and an electric machine having two or more three-phase windings galvanically separated from each other. Two or more inverter units are connected to the three-phase windings. The arrangement also includes first main circuit switches to galvanically separate each supply unit from a supply, second main circuit switches to galvanically separate each supply unit from the intermediate circuit, first intermediate circuit switches to galvanically separate each inverter unit from the intermediate circuit, and second intermediate circuit switches to galvanically separate each inverter unit from the electric machine. | 10-20-2011 |
| 20110254473 | ARRANGEMENT AND METHOD FOR CONTROLLING FREQUENCY CONVERTER MODULES - An arrangement for controlling frequency converter modules of an electric drive. In the arrangement, the frequency converter modules are arranged to control alternatively a first motor or several motors having less power than the first motor. | 10-20-2011 |
| 20110200454 | METHOD IN CONNECTION WITH A PUMP DRIVEN WITH A FREQUENCY CONVERTER AND FREQUENCY CONVERTER - An exemplary frequency converter and method are directed to estimating an operation point of a pump when the QH characteristic curve of the pump is known. The frequency converter controls the pump, and a process curve is estimated when a first operation point of the pump is in the nominal range. The process curve defines a head as a function of volumetric flow. A rotational speed of the pump is determined and a QH characteristic curve of the pump is converted to a current rotational speed of the pump based on affinity laws. A second operation point of the pump is estimated by determining an intersection point of the converted QH characteristic curve and the estimated process curve. | 08-18-2011 |
| 20110198064 | COOLING STRUCTURE FOR ELECTRONIC DEVICE, AND A METHOD - This disclosure relates to a cooling structure for an electronic device including an inlet for conveying a flow in a first flow direction towards a first component and an outlet for conveying the flow further. To deter dirt particles from proceeding to electronic components, the cooling structure can include a second flow channel, which starts from a port oriented transversely to the first flow direction or away therefrom and receives part of the flow from the inlet, and which conveys the part of the flow to an electronic component located in the second flow channel. | 08-18-2011 |
| 20110181212 | CONTROL METHOD FOR FREQUENCY CONVERTER - A motor drive and a method in connection with a motor drive including a frequency converter are provided. The motor of the drive is connected to a load, and the motor is controlled with the frequency controller. The method includes the steps of converting changes in electrical quantities of the motor caused by actions affecting the load into observations representing the changes, selecting control symbols on the basis of matching of the sequences of observations with a set of valid patterns, and controlling the converter based on the selected symbols. | 07-28-2011 |
| 20110176274 | COOLING ELEMENT - A cooling element for an electronic apparatus can include an inlet for receiving fluid, an outlet for forwarding fluid from the cooling element, and multiple pipes providing parallel fluid paths for passing the fluid from the inlet to the outlet. To obtain a simple and efficient cooling element, multiple base plates for receiving electronic components can be attached to the pipes for conducting heat generated by the electronic components to the fluid in the pipes. | 07-21-2011 |
| 20110169504 | METHOD AND APPARATUS FOR MEASURING BEARING CURRENTS IN AN ELECTRICAL MACHINE - The present disclosure relates to a measuring bearing currents in an electrical machine. According to exemplary embodiments, radio frequency signals that are generated by electric discharges are detected by an antenna near the bearing. A synchronizing signal is combined with the origin of the bearing current and signal triggered by the synchronizing signal is measured. | 07-14-2011 |
| 20110149513 | POWER ELECTRONIC APPARATUS WITH COOLING ARRANGEMENT - A power electronic apparatus with cooling arrangement comprises a housing ( | 06-23-2011 |
| 20110149512 | POWER ELECTRONIC APPARATUSES WITH COOLING ARRANGEMENTS - A power electronic device with cooling arrangement includes a housing that accommodates power electronic components. At least two adjacent axial fans are connected to the housing for inducing an airflow from outside into the housing in order to cool the power electronic components. Furthermore, the device can include a separating wall that extends outside the housing from between the at least two adjacent axial fans in order to reduce noise caused by the fans. Such a cooling arrangement can provide a power electronic device with effective cooling in compact size and also having an acceptable level of noise. | 06-23-2011 |
| 20110148334 | METHOD AND ARRANGEMENT FOR CONTROLLING PERMANENT MAGNET SYNCHRONOUS MACHINES - A method and an arrangement are provided for controlling a sensorless permanent magnet synchronous machine using a frequency converter connected to feed the machine with electrical power. A current a current vector having a magnitude is produced to the stator of the machine with the frequency converter, and the current vector is rotated for rotating the rotor of the machine. Prior to starting the drive, a value is defined for the magnitude of the current vector and a frequency limit. The defined value is used as the magnitude of the current vector when the rotor of the machine is rotated with a frequency that is lower than the defined frequency limit. A vector control method is used for controlling the machine when the frequency of the machine is higher than or equal to the defined frequency limit. | 06-23-2011 |
| 20110147185 | CONTROLLER UNIT FOR SWITCHING DEVICE - Exemplary embodiments are directed to a controller unit for a switching device. The controller unit includes a body part and an operating axle. The operating axle is connected to contacts of the switching device to adjust a respective state of the contacts between a closed position and an open position. A control axle includes a first axle part and a second axle part, the first axle part is arranged to be turned by a user, and the second axle part is functionally connected to the operating axle to turn it between the open position and the closed position. A tripping assembly is functionally connected to the operating axle to turn the operating axle from the closed position to the open position. The controller unit also includes connecting means for functionally connecting a first axle part to one of a tripping assembly and a second axle part. | 06-23-2011 |
| 20110147184 | CONTROLLER UNIT FOR SWITCHING DEVICE - Exemplary embodiments are directed to a controller unit for a switching device. The controller unit includes a body part and an operating axle, which is turnable between a closed position and an open position in relation to the body part and is functionally connectable to contacts of the switching device to change respective states of the contacts between the closed position and the open position. The controller also includes a control axle that is turned by a user between an off-position and an on-position in relation to the body part and is functionally connected to turn the operating axle. A tripping assembly is functionally connected to the operating axle such that the tripping event of the tripping assembly turns the operating axle from the closed position to the open position. Connecting means selectably connect the control axle to the tripping assembly. | 06-23-2011 |
| 20110147183 | TRIPPING ASSEMBLY FOR SWITCHING DEVICE - A tripping assembly is provided for a switching device. The tripping assembly includes: a body part, a tripping axle configured to turn between a trip position and a tensioned position in relation to the body part; a tripping frame configured to turn between a trip position and a tensioned position in relation to the body part and whose turning axis is substantially parallel with the turning axis of the tripping axle; at least one tripping spring which has an non-tensioned state and a tensioned state and which is functionally connected to the tripping axle and to the tripping frame; a frame spring which has a non-tensioned state and a tensioned state and which is functionally connected between the body part and the tripping frame; and a connecting member which is arranged to functionally connect the tripping axle and the tripping frame both in the final stage of a tensioning event and in the initial stage of a tripping event. In the tripping event: (i) both the frame spring and the at least one tripping spring are configured to transfer from the tensioned state to the non-tensioned state, thus releasing energy needed for the tripping event to the tripping assembly; and (ii) the tripping frame and the tripping axle are configured to turn from their tensioned positions to their trip positions, and while doing so, to turn to opposite directions with respect to one another. | 06-23-2011 |
| 20110128105 | METHOD FOR MANUFACTURING COIL, AND A COIL - A coil includes electrically conductive winding wire wound in turns around a core in one or more layers. The surface of the winding wire is provided with at least one groove in the direction of the longitudinal axis of the winding wire, and at least one cooling tube which enables coolant circulation is positioned in the groove of the winding wire, being at least partly embedded therein. The groove is formed on the surface of the winding wire of an outermost winding wire layer relative to the core and opens away from the core The cooling tube in the groove is placed around the outermost winding wire layer and covers the outermost winding wire layer at least partly. | 06-02-2011 |
| 20110076163 | METHOD AND APPARATUS IN CONNECTION WITH PUMP DRIVE - A method in connection with a pump drive connected to a container or the like, wherein a frequency converter is arranged to supply power to a pump in such a manner that a pump flow (Q | 03-31-2011 |
| 20110074489 | INVERTER - A two-level or multi-level inverter are supplied with a positive auxiliary voltage (Ug+) and a negative auxiliary voltage (Ug−). A bootstrap technique provides a first positive auxiliary voltage and a first negative auxiliary voltage from the supplied potentials. The bootstrap technique provides at least one additional negative auxiliary voltage to a switch driver of at least one semiconductor switch from the first negative auxiliary voltage. At the start up of an inverter, the inverter can perform a startup sequence to provide auxiliary voltages to the respective auxiliary voltage inputs of the switch drivers by turning the power semiconductors sequentially on and off. | 03-31-2011 |
| 20110071684 | METHOD AND ARRANGEMENT FOR OPERATING A SHIP RAMP - A method and arrangement are provided for operating a ship ramp driven by an electric motor between an upper end position and a lower end position. The arrangement includes means for reducing the maximum torque of the at least one electric motor when the ramp is in proximity to an end position of the ramp, and means for determining the position of the ramp on the basis of at least one of the number of rotations performed by the at least one electric motor, a quantity indicative of the number of rotations, and an elapsed time in accordance with the velocity of the ramp. The arrangement also includes means for allowing the reduction of the maximum torque of the at least one electric motor only when the determined position of the ramp is within a zone defined by predetermined limits. | 03-24-2011 |
| 20110069520 | FREQUENCY CONVERTER - A frequency converter includes a housing, a frequency conversion component installed in the housing, a controller that controls the frequency conversion component, and a user interface that transmits control commands from a user to the controller. The controller of the frequency converter are provided with a load examination function that examines whether a load is connected to an output of the frequency conversion component, the controller raising an output frequency of the frequency conversion component to a desired value in response to a load connected to the frequency conversion component and detected by the load examination function. | 03-24-2011 |
| 20110061834 | COOLED BASE PLATE FOR ELECTRIC COMPONENTS - A cooled base plate is provided for electric components. A first side of the cooled base plate is provided for attaching exothermal electric components thereto. On a second side of the base plate, opposite to the first side, there is embedded a cooling channel system having a cooling fluid inlet at a first end of the base plate and a cooling fluid outlet at a second end of the base plate. In order to minimize differences in temperature between the electric components, the thickness of the base plate increases in the direction from the inlet of the cooling channel system towards the outlet of the cooling channel system, e.g., in the flow direction of the cooling fluid, for at least a portion of the length of the base plate. | 03-17-2011 |
| 20110010116 | INDUCTION MOTOR PARAMETER IDENTIFICATION - A method and an arrangement are provided for identifying parameters of an induction machine when the induction machine is connected to the output phases of a voltage source inverter and the induction machine is in standstill state. The method includes providing a DC magnetization current (i | 01-13-2011 |
| 20110001447 | ESTIMATION OF PARAMETERS OF AN INDUCTION MACHINE - A method and an arrangement are disclosed for identifying one or more parameters of an induction machine when the induction machine is connected to the output phases of a voltage source inverter and the induction machine is in standstill state. The method can include a first phase for magnetizing the machine by providing a first DC magnetization current until the induction machine reaches steady state, the current reference of the inverter having a first value (i | 01-06-2011 |
| 20100290196 | ELECTRICAL CABINET - The disclosure relates to an electrical cabinet for receiving and enclosing an electrical apparatus such that the electrical apparatus can be isolated from surroundings by the electrical cabinet. To address water condensing inside the electrical cabinet, a roof construction of the electrical cabinet includes at least a first capillary part located above the electrical apparatus, and the first capillary part includes capillary grooves for recovering liquid condensing on the first capillary part. | 11-18-2010 |
| 20100265659 | ELECTRIC DRIVE - An electric drive is disclosed which includes at least a choke unit, a power step unit, and a capacitor unit for implementing power supply to an electricity-consuming device. A cooling arrangement is disclosed for cooling the choke unit, the power step unit, and the capacitor unit. The choke unit, the power step unit, and the capacitor unit can be distributed into at least two separate and separately coolable entities, and the cooling arrangement can include parallel cooling apparatuses for cooling the at least two separate and separately coolable entities. | 10-21-2010 |
| 20100237727 | ARRANGEMENT AND METHOD FOR COOLING AN ELECTRICAL MACHINE - An exemplary arrangement is disclosed for cooling an electrical machine having an external rotor rotating around its rotation axis and a stator having sheet packs, located inside the rotor at the end of an air gap. In the arrangement, a first part of a coolant flow is conducted from both ends of the stator through axial cooling channels into the stator sheet pack. A second part of the coolant flow is conducted from both ends of the stator into the air gap and from the air gap through at least one radial cooling channel into the stator sheet pack. Both parts of the coolant flow are conductable into at least one heat exchanger placed radially inside and at a distance from the stator sheet pack. At least one fan is placed radially inside the heat exchanger to send the first and the second part of the coolant flow to the ends of the stator. | 09-23-2010 |
| 20100232106 | ARRANGEMENT FOR A MOTOR CONTROLLER - An arrangement is disclosed for a motor controller, the arrangement including a number of power semiconductors and cooling elements, the cooling elements being connected to the power semiconductors for cooling them. The power semiconductors and the cooling elements are disposed around a center axis of the arrangement in such a manner that they demark a channel around the center axis from at least three sides, to which channel cooling surfaces of the cooling elements extend and in which the cooling medium is able to flow in the direction of the center axis, and the power semiconductors extend from the connections between the power semiconductors and the cooling elements substantially away from the center axis. The arrangement can further include at least one choke disposed in the channel demarked around the center axis. | 09-16-2010 |
| 20100226153 | METHOD AND ARRANGEMENT IN CONNECTION WITH HALF-CONTROLLED NETWORK BRIDGE - A method and an arrangement for controlling phase-specific thyristors of a half-controlled network bridge. The method comprises the steps of identifying continuously a thyristor to be controlled on the basis of magnitudes of supplying phase voltages; controlling the thyristor by enabling a current flow to its gate current circuit through an inductive component of a constant current regulator, which constant current regulator is common to all the gate current circuits, the thyristor control comprising the steps of determining a magnitude of the gate current at the potential of the gate conductor in the constant current regulator, alternately switching the voltage producing the gate current off from the gate current circuit when the gate current is higher than a predetermined limit, and switching the voltage producing the gate current on in the gate current circuit when the gate current is lower than a predetermined limit. | 09-09-2010 |
| 20100194512 | PERMANENT MAGNET DC INDUCTOR - A permanent magnet DC inductor is disclosed which includes at least two separate and individual magnetic inductors, each having its own core structure and forming closed individual magnetic paths having at least one magnetic gap. Windings are provided on the magnetic cores, and at least one permanent magnet piece is provided with each inductor. The separate magnetic cores having the at least one magnetic gap are arranged against each other to form external magnetic gaps with the permanent magnet pieces arranged inside the external magnetic gaps on both sides of the at least one magnetic gap. | 08-05-2010 |
| 20100194451 | METHOD OF CONTROLLING AN IGBT AND A GATE DRIVER - A method is disclosed for controlling an IGBT component and a gate driver. An exemplary method includes producing, with two separate driver circuits, a gate voltage for controlling the IGBT component, the outputs of the driver circuits being connected to free ends of a series connection of resistive components. A location, such as a midpoint between the series connection, forms the gate voltage. | 08-05-2010 |
| 20100188135 | LOAD BALANCING OF PARALLEL CONNECTED INVERTER MODULES - A method and an arrangement are disclosed for balancing load between parallel connected inverter modules, which inverter modules are arranged to supply a common load. The method can include providing similar switching instructions for parallel connected inverter modules, determining on the basis of phase currents of each parallel inverter module a first time period for each output phase of each inverter module for correcting current imbalance by advancing or delaying turn-on or turn-off time instants of switch components of the inverter modules, and advancing or delaying the turn-on or turn-off time instants of the switching instructions based on the first time period. The method also can include determining temperatures of each output phase of each inverter module, modifying the switching instructions for one or more of the parallel inverter modules for controlling the temperatures of the output phases, and controlling the inverter modules with a switching instruction in which the turn-on or turn-off times have been advanced or delayed in respect of one or more parallel modules and further modified in respect of one or more inverter modules. | 07-29-2010 |
| 20100188122 | SYNCHRONIZING AN INVERTER WITH AN ALTERNATING VOLTAGE SOURCE - A method and device are disclosed for synchronizing an inverter with an alternating voltage source. The method includes measuring a current generated by the alternating voltage source and flowing through diodes of the inverter, determining a phase angle and angular velocity relating to the alternating voltage source from the measured current for enabling synchronization between the inverter and the alternating voltage source, and starting modulation of the inverter according to the obtained phase angle and angular velocity. | 07-29-2010 |
| 20100181412 | METHOD AND APPARATUS FOR DECELERATING A MACHINE REEL OF AN UNWINDER - A method and apparatus are provided for decelerating an inverter-controlled machine reel in a paper machine. The method includes detecting a break in a paper web from a machine reel, determining the inertia of the machine reel, determining continuously the angular speed of the machine reel, and determining continuously the torque required to decelerate the machine reel, on the basis of the determined inertia and angular speed, for the purpose of stopping the machine reel in a predefined time. The method also includes decelerating the machine reel electrically to stop the machine reel, in accordance with the determined torque, and using a mechanical brake when the rotation speed of the machine reel is lower than a predefined rotation speed and when the torque obtained by electrical deceleration is too small to stop the machine reel in a predefined time. | 07-22-2010 |
| 20100180926 | SOLAR POWER PLANT - A solar power plant is disclosed for converting solar energy into electric energy, and having a plurality of solar cell units, each solar cell unit containing a first cell pole and a second cell pole. The cell poles can cooperate for feeding electric energy produced by the solar cell unit as direct current out of the solar cell unit. A direct-current converter can include a plurality of direct-current input poles and two direct-current output poles, each direct-current input pole being connected to at least one cell pole. The direct-current converter can convert input direct currents entered via the direct-current input poles, and having input voltages, into an output direct current having an output voltage, and feed the output direct current via the direct-current output poles out of the direct-current converter. The direct-current converter can include a three-phase inverter unit having three phase poles and two direct-voltage poles, the inverter unit being adapted to serve as a direct-current converter in such a manner that each of the three phase poles are adapted as direct-current input poles and each of the direct-voltage poles is in electrically conductive connection to exactly one direct-current output pole of the direct-current converter. | 07-22-2010 |
| 20100164665 | METHOD FOR MANUFACTURING INDUCTIVE ELECTRIC COMPONENT, AND INDUCTIVE ELECTRIC COMPONENT - A method and electric component, such as inductor, coil, resistor, or the like, are disclosed wherein a winding includes at least one spiral or coiled element, the spiral or coiled element being formed from a piece furnished with cooling ribs. | 07-01-2010 |
| 20100164319 | METHOD FOR MANUFACTURING A WINDING COIL FOR AN ELECTRICAL MACHINE AND A WINDING FOR AN ELECTRICAL MACHINE - The object of the invention is a method for manufacturing a winding coil for an electrical machine, as well as the corresponding winding. The electrical machine comprises a stator sheet pack in which slots are arranged at the edge of the inner circumference of the sheet pack for fitting the winding coils. In the method, a winding coil is made of flat wire so that one coil turn ( | 07-01-2010 |
| 20100156435 | METHOD AND ARRANGEMENT FOR MONITORING CONNECTIONS OF SWITCH INTENDED FOR ACTIVATING SAFETY FUNCTION - A method and an arrangement are disclosed for monitoring connections of a switch intended for activating a safety function, the switch having at least two poles. The arrangement can supply voltages to first sides of two poles of the switch through first connections, and monitor the voltages supplied through the switch and further from second sides of the two poles of the switch to a device through second connections. The arrangement can form a voltage difference between the voltages to be supplied to the first sides of the two poles of the switch, and detect a connection failure when the difference between the voltages supplied to the device does not correspond with the formed voltage difference or when the difference between the voltages supplied to the device is substantially zero. | 06-24-2010 |
| 20100156178 | METHOD AND ARRANGEMENT FOR LIMITING ELECTRIC POWER REQUIRED BY ELECTRIC LOADS - A method and arrangement for limiting an electric power required by at least two electric loads, each of which has a predetermined priority level, the arrangement comprising means ( | 06-24-2010 |
| 20100143157 | METHOD AND SYSTEM FOR DETECTING CAVITATION OF PUMP AND FREQUENCY CONVERTER - A method and a system are disclosed in accordance with a pump controlled with a frequency converter. An exemplary method includes controlling the pump with a frequency converter, the frequency converter feeding a motor connected to drive the pump, providing a torque estimate (T | 06-10-2010 |
| 20100142238 | METHOD AND DEVICE IN FREQUENCY CONVERTER - A method in connection with a frequency converter for correcting the power factor of the frequency converter, and a power factor correction unit. The method includes connecting the power factor correction unit between a rectifier bridge of the frequency converter and the supplying AC voltage network, generating with the power factor correction unit DC voltage from the AC voltage of the supply network and feeding the generated DC voltage to the frequency converter via the rectifier bridge of the frequency converter. | 06-10-2010 |
| 20100134064 | METHOD AND APPARATUS FOR ESTIMATING A ROTATION SPEED OF AN ELECTRIC MOTOR - A method is disclosed for estimating a rotation speed of an electric motor supplied by an inverter, by determining a time derivative of a stator current vector of the electric motor during a zero vector state of the inverter; and determining an estimate of the rotation speed of the electric motor on the basis of the determined time derivative of the stator current vector. | 06-03-2010 |
| 20100133933 | COOLING ARRANGEMENT FOR AN ELECTRICAL MACHINE - A cooling arrangement is disclosed for an electrical machine in which the main cooling air circulation within the machine is arranged using a centrifugal blower in at least one of the ends of the machine, making the main cooling air circulation flow through at least an air space in the machine and the outer surface of the stator. A circulating fan is arranged in the immediate vicinity of the centrifugal fan for the purpose of generating a coil end circulation that circulates air at least in the area of the machine's coil ends. | 06-03-2010 |
| 20100128505 | CURRENT MEASUREMENT IN AN INVERTER UNIT AND A FREQUENCY CONVERTER - A method and an arrangement of measuring inverter current, where the inverter is connected to and supplied by a DC intermediate circuit having two or more parallel capacitor branches connected between the positive and negative rail of the DC intermediate circuit, and the capacitance of the capacitor branches being known. The method comprises the steps of measuring the current of one of the parallel capacitor branches, and determining from the measured current the magnitude of the inverter current. | 05-27-2010 |
| 20100116191 | MOORING WINCH AND A METHOD FOR CONTROLLING A CABLE OF A MOORING WINCH - An electrically driven mooring includes a winding drum ( | 05-13-2010 |
| 20100106301 | METHOD FOR CONTROLLING AN ELECTRIC DRIVE - The invention discloses a method for controlling an electric drive that drives reels of a slitter in the paper machine. In the method at least speed and acceleration/deceleration of a slitter is controlled. According to the invention a limit value of the electric drive is defined in the method, values of at least two or more parameters effecting to the electric drive is monitored, a reference value of the acceleration/deceleration is defined on the basis of at least two parameters, and the electric drive is controlled so that the acceleration/deceleration corresponds to the highest possible reference value, by which the reference value of the acceleration/deceleration defined on the basis of any parameter is not exceeded, and that the limit value of the electric drive is not exceeded. | 04-29-2010 |
| 20100097121 | METHOD AND ARRANGEMENT FOR CONTROLLING SEMICONDUCTOR COMPONENT - A method is disclosed for controlling a semiconductor component which includes a voltage controlled gate. The method includes determining and storing, prior to use of the semiconductor component, reference values of a gate voltage to be given to the gate of the semiconductor component during a change of operating states. The method also includes providing a pulse width modulated voltage from a driver circuit to a resistor connected to the gate of the semiconductor component according to the stored reference values of the gate voltage when a change in operating states of the semiconductor component is desired. | 04-22-2010 |
| 20100060328 | REDUCTION OF SEMICONDUCTOR STRESSES - A method of reducing thermal stresses of a semiconductor component in a frequency converter, an arrangement in a frequency converter, and a frequency converter, wherein the semiconductor component is attached to a cooling element for cooling the semiconductor component and one or more resistive elements are attached to the cooling element. In the method, the cooling element is heated by the one or more resistive elements attached thereto by supplying current from the frequency converter through the one or more resistive elements for obtaining an elevated lowest temperature for the semiconductor component and thereby reducing the amount of temperature change between the highest and the lowest temperatures in the semiconductor component during use of the frequency converter. | 03-11-2010 |
| 20100052582 | METHOD AND ARRANGEMENT FOR DETERMINING ROTATION SPEED OF A MOTOR - A method and an arrangement for determining the rotation speed of a motor fed by an inverter, the arrangement comprising means for determining the rotation speed of the motor in at least two alternative manners, whereby the means for determining the rotation speed of the motor comprise one of the at least two alternative manners of performance: means for measuring the frequency of the voltage fed to the motor by the inverter; and means for estimating the rotation speed of the motor on the basis of the measured frequency. | 03-04-2010 |
| 20100039445 | DISPLAYING INFORMATION ON MOVING OBJECTS, AND FREQUENCY CONVERTER - A method, equipment and frequency converter for displaying information on a moving object, the information being displayed using a light source row arranged to the moving object. The method comprises the steps of generating the information to be displayed; controlling the movement of the moving object by the frequency converter; generating control data for the light source row in accordance with information obtained from the frequency converter on the motion state of the moving object and the information to be displayed; and controlling the light sources in the light source row arranged to the moving object in accordance with the control data. | 02-18-2010 |
| 20100039162 | METHOD OF CONTROLLING A RECTIFYING BRIDGE IN A DIODE MODE AND A CIRCUIT FOR THE CONTROL - A method and a circuit for controlling a thyristor (V | 02-18-2010 |
| 20100039161 | METHOD OF CONTROLLING A RECTIFYING BRIDGE AND A CIRCUIT FOR THE CONTROL - A circuit for controlling a thyristor (V | 02-18-2010 |
| 20100019597 | ROTOR FOR A PERMANENT-MAGNET ELECTRICAL MACHINE - The object of the invention is a rotor for an electrical machine excited by permanent magnets, said rotor comprising a substantially cylindrical magnetic body of the rotor fitted onto the shaft of the electrical machine and a set of permanent magnets used to create a first and a second pole alternately in the circumferential direction, excited in opposite directions. The permanent magnets are fitted into openings arranged within the rotor. The rotor comprises a body part with several segments extending to the outer circumference in the circumferential direction and an outward tapered section remaining between the segments in the radial direction of the rotor. Permanent-magnet pieces are arranged between each section and segment. | 01-28-2010 |
| 20100001608 | ROTOR FOR ELECTRIC MACHINE - Electric machine rotor comprising: an inner rotor element and an outer rotor element positioned more outwards in the radial direction than the inner rotor element, the inner rotor element and the outer rotor element being made of a material of high permeance, and an air gap of low permeance between the inner rotor element and the outer rotor element. The outer rotor element forms a shape-mating pair with the inner rotor element, the inner rotor element and the outer rotor element being shaped in such a way that radial detachment of the outer rotor element from the inner rotor element is prevented. | 01-07-2010 |
| 20090295588 | METHOD AND APPARATUS FOR VERIFYING A LEAK IN CONNECTION WITH A FLOW INHIBITOR - The present invention relates to a method for verifying a leak situation in a liquid transfer system where liquid is transferred with a frequency-converter-controlled pump from a lower pressure to a higher pressure and where liquid is prevented from being transferred from a higher pressure to a lower pressure with one or more check valves positioned in a pipe system. The method is characterized by comprising the steps of comprising the steps of generating for the frequency converter motion information on the motion of the pump between the motion operations, and indicating a leak situation of the check valve if the direction of operation of the pump is, in the motion information, opposite to the direction of operation during the use of the pump. Further, the invention relates to a system and a control unit of a frequency converter for implementing the method. | 12-03-2009 |
| 20090267545 | METHOD AND ARRANGEMENT IN CONNECTION WITH A BRAKE CHOPPER - A method of controlling a brake chopper and a control arrangement, the brake chopper being connected between the positive and the negative rails of an intermediate voltage circuit feeding an inverter bridge, wherein current measurement means are arranged between a DC voltage source and the brake chopper and adapted to measure DC current flowing in the intermediate voltage circuit, which method comprises steps of forming with the inverter bridge an output voltage to a load connected to the output of the inverter bridge, determining a time instant when the DC current of the intermediate circuit is sampled, and preventing the use of the brake chopper at the determined time instant. | 10-29-2009 |
| 20090261668 | COOLING ELEMENT FOR AN ELECTRICAL MACHINE - In an electrical machine cooling element according to the invention, the electrical machine ( | 10-22-2009 |
| 20090231891 | REACTOR ARRANGEMENT FOR ALTERNATING ELECTRICAL CURRENT - A reactor arrangement for alternating electrical current includes different coils ( | 09-17-2009 |
| 20090231074 | REACTOR ARRANGEMENT - A reactor arrangement for alternating electrical currents includes, for each alternating electrical current, different coils ( | 09-17-2009 |
| 20090190281 | LOAD CONTROL APPARATUS - A load control apparatus adapted to indirectly detect an overcurrent, i.e. a current magnitude exceeding a predetermined limit value, occurring in an electric conductor element ( | 07-30-2009 |
| 20090177295 | METHOD AND APPARATUS FOR TRANSFERRING SIGNAL DATA - The invention relates to a method and device for transferring signal data from a sender to one or more receivers. The invention includes receiving a quantity as a function of time, arranging the quantity into a first polynomial to obtain values for polynomial coefficients of a first continuous signal, and transferring the values of the polynomial coefficients of the first continuous signal via a first data transfer link to one or more receivers. | 07-09-2009 |
| 20090165473 | AIR DEHUMIDIFIER FOR FREQUENCY CONVERTER ARRANGEMENT - The invention relates to an air dehumidifier for a frequency converter arrangement ( | 07-02-2009 |
| 20090160453 | METHOD AND APPARATUS FOR DETECTING GROUND FAULT - Method and apparatus for detecting a ground fault, the apparatus comprising means arranged to monitor a sum current of output phases of a frequency converter, means arranged to detect a ground fault, if the sum current exceeds a predetermined threshold value, and means for performing the initial setting of the threshold value, the means being arranged to determine the value of the sum current when the frequency converter starts up and to set the threshold value so that it is greater than the predetermined value of the sum current. | 06-25-2009 |
| 20090146521 | PERMANENT MAGNET MODULE AND AN ELECTRICAL MACHINE ROTOR INCLUDING THE MODULE - The object of the invention is a permanent magnet module comprising at least two permanent magnets with the first magnetic pole on the first plane surface and the second magnetic pole on the second plane surface, and a cover at least partially enveloping the permanent magnets. According to the invention the cover of the module is magnetically conductive and comprises a top surface, substantially covering the first plane surface of the permanent magnet, and a bottom surface, substantially covering the second plane surface of the permanent magnet. The cover is at least partially open at the side surfaces of the permanent magnet. Another object of the invention is a rotor for an electrical machine, the rotor having permanent magnets fitted into a corresponding module. | 06-11-2009 |
| 20090146520 | PERMANENT MAGNET UNIT FOR AN ELECTRICAL MACHINE, A METHOD OF INSTALLING PERMANENT MAGNET UNITS AND A ROTOR OF AN ELECTRICAL MACHINE - In a permanent magnet unit according to the invention, designed for an electrical machine comprising a stator and rotor, at least one permanent magnet ( | 06-11-2009 |
| 20090138669 | Frequency Converter - The present invention relates to a frequency converter ( | 05-28-2009 |
| 20090134714 | COMPENSATION OF HARMONICS OF ELECTRICAL NETWORK - A system and a method for compensating harmonic components or a reactive power of an electrical network. The system comprises a measurement unit ( | 05-28-2009 |
| 20090116405 | Redundant Automation Data Communications Network - The object of the invention is an automation data communications network ( | 05-07-2009 |
| 20090103570 | Time Synchronization in Serial Communications - A real-time clock ( | 04-23-2009 |
| 20090096408 | FREQUENCY CONVERTER - The present invention relates to a frequency converter comprising electric power supply devices for supplying electric power to an electric motor ( | 04-16-2009 |
| 20090094080 | METHOD AND A SYSTEM FOR IMPROVING THE OPERABILITY OF A PRODUCTION PLANT - A method for improving the operability of a production plant is invented. The production plant has at least one production process comprising at least one equipment, a system for obtaining equipment condition measuring data and a system for obtaining maintenance work data. The equipment condition measuring data and the maintenance work data is continuously acquired and stored to equipment reliability calculation system, and equipment reliability is calculated based on the equipment condition measuring data and the maintenance work data. | 04-09-2009 |
| 20090066453 | CHOKE OF ELECTRIC DEVICE - The present invention relates to a choke ( | 03-12-2009 |
| 20090059625 | SINGLE-PHASE TO THREE-PHASE CONVERTER - Single-phase to three-phase converter comprising a rectifier stage, a DC link and an inverter stage, wherein the rectifier comprises a filter choke, one controllable switch for power factor correction, rectifying diodes arranged in a diode bridge configuration having input terminals and output terminals, the controllable switch being connected to the output terminals of the diode bridge, an upper blocking diode arranged between the positive output terminal of the diode bridge and the positive input of the DC link and a lower blocking diode arranged between the negative output terminal of the diode bridge and the negative input of the DC link, the DC link comprises a capacitor bank connected between the DC link, which capacitor bank has a center point. The inverter stage comprises three phase outputs, two of which are formed with a series connections of controllable switches arranged between the DC link for switching either positive voltage or negative voltage of the DC link to the phase outputs, and one phase output is formed of the voltage of the center point of the capacitor bank, and in that the center point of the capacitor bank is configured to be optionally connected to the neutral line of the single-phase AC input by using a connection switch element providing thereby doubled voltage to the DC link. | 03-05-2009 |
| 20090052217 | METHOD AND APPARATUS FOR STABILIZING VOLTAGE OF INTERMEDIATE CIRCUT OF FREQUENCY CONVERTER - A method and an apparatus for damping voltage oscillation of a voltage intermediate circuit of a frequency converter, the frequency converter comprising a half controlled rectifier bridge coupled to a supply network. The method comprises determining magnitude (U | 02-26-2009 |
| 20090039987 | Switching Device Module - A switching device module comprising a frame ( | 02-12-2009 |
| 20090022391 | Method and Product for Detecting Abnormalities - A new method for processing image data in order to detect abnormalities in a web is provided. The web is monitored by at least one camera, whereby an image comprising of plurality of pixels is generated. The data of the image is stored in a memory. Image data is filtered by a processor by creating a filtered image data by weighting the image data and at least one of earlier image data and earlier filtered image data; and combining the weighted image data and at least one of the weighted earlier image data and the weighted earlier filtered image data; and controlling filtering by at least one nonlinear algorithm; and thresholding the created filtered image data. | 01-22-2009 |
| 20090000767 | COOLING ELEMENT - The present invention relates to a cooling element ( | 01-01-2009 |
| 20080316777 | Method for thermal protection of frequency converter and a frequency converter - A method for thermal protection of a frequency converter and a frequency converter that comprises means for controlling the output current of the frequency converter. The method comprises the steps of determining beforehand two or more data points which define a thermal current limit for a semiconductor component of the frequency converter at specific temperatures at two or more switching frequencies, determining beforehand two or more data points which define a thermal current limit for the semiconductor component at specific temperatures at a zero converter output frequency, measuring the temperature of the semiconductor component, determining the switching frequency of the frequency converter, determining the output frequency of the frequency converter, determining the highest allowable thermal current as a function of measured temperature, determined switching frequency and determined output frequency on the basis of the defined data points, and limiting the output current of the frequency converter to the determined highest allowable thermal current. | 12-25-2008 |
| 20080310206 | Method for controlling frequency converter unit, and frequency converter assembly - A method for controlling a frequency converter unit, the frequency converter unit containing an input connection for supplying electric power at an input frequency to the frequency converter unit, and an output connection for supplying electric power at an output frequency from the frequency converter unit, the method comprising a control step, in which the frequency converter unit is controlled by means of control signals. In the control step the control signals are supplied through an inductive connection to at least one wire connected to the input connection or the output connection of the frequency converter unit for transmitting electric power, the control signals being supplied to the frequency converter unit over the at least one wire. | 12-18-2008 |
| 20080303620 | DC Inductor - A DC inductor comprising a core structure ( | 12-11-2008 |
| 20080303619 | PROTECTION OF PERMANENT MAGNENTS IN A DC-INDUCTOR - A DC inductor comprising a core structure ( | 12-11-2008 |
| 20080290749 | End Shield - A cast end shield for an electrical machine, said end shield supporting a bearing that supports the rotor, and said end shield having an opening in the middle. In the radial direction from the centre of the shield, there is an inner rim limited by the opening, an intermediate rim connected to the inner rim and an outer rim connected to the intermediate rim. The intermediate rim has at least one substantially waved reinforcement structure, and within the reinforcement structure, the valleys of the waves are substantially in the radial direction. | 11-27-2008 |
| 20080288100 | Method for creating a cutting plan for a strip-like material - A method for creating a cutting plan for a strip-like material for maximizing a quality yield of the process is invented. In the method a cutting plan for a strip-like material is made based on end-product data, and the strip-like material is driven at a production speed in a manufacturing machine or in a finishing machine, and strip length data is recorded. A chart of the strip-like material characteristics is generated and stored in a memory. The recorded strip length data and the chart of the strip-like material characteristics is calibrated with calibration data in a winding process, and during a set change in the winding process the cutting plan for the strip-like material is optimized for maximizing a quality yield of the process based on the end-product data and the calibrated chart of the strip-like material characteristics, and a revised cutting plan is created from the optimization result. | 11-20-2008 |
| 20080265823 | Stator resistance adaptation in sensorless PMSM drives - A method of estimating stator resistance of a permanent magnet synchronous machine, when the permanent magnet synchronous machine is controlled with an inverter using a control system having an adaptive observer which is augmented with a signal injection, the adaptive observer having a stator resistance estimate ({circumflex over (R)} | 10-30-2008 |
| 20080253041 | Thermal Overload Protection - A thermal overload protection for an electrical device, particularly an electric motor (M), measures a load current supplied to the electrical device (M), and calculates the thermal load on the electrical device on the basis of the measured load current, and shuts off (S | 10-16-2008 |
| 20080247816 | Arrangement for Securing Switch Control Shaft to Switch Pipe Shaft - The invention relates to an arrangement for attaching a switch control shaft to a switch pipe shaft, where the control shaft is mounted partly in the switch pipe shaft and tightened to the switch pipe shaft by a screw. The arrangement comprises a tightening piece. The screw is arranged to act on the control shaft through the tightening piece so that when the screw is turned, the tightening piece is arranged to press the control shaft against the pipe shaft so that the control shaft tightens fast between the tightening piece and the pipe shaft. | 10-09-2008 |
| 20080216995 | Arrangement in a heat exchanger - In the arrangement in a heat exchanger in accordance with the invention, the heat exchanger comprises a shell and tubes. The tubes are placed inside the shell. The first medium entering the heat exchanger can be conducted into the tubes and the second medium between the inner shell surface and outer tube surface, and the first medium from the heat exchanger can be conducted out from the tubes and the second medium out from between the inner shell surface and outer tube surface. The heat exchanger comprises at least two tube rows placed in succession in the direction of the second medium's flow. The first tube row comprises at least two tubes, the first distance being between the two parallel tubes, the second distance being between the first parallel tube in the first row and a tube in the second row, and the third distance is between the second parallel tube in the first row and the tube in the second row. The first, second and third distances form a triangle, each angle of which is smaller than 90° and the second distance is a different length from the third distance. | 09-11-2008 |
| 20080205097 | Method and arrangement in connection with inverter - A method and an arrangement for controlling an inverter provided with a voltage intermediate circuit, the inverter ( | 08-28-2008 |
| 20080204976 | Fastening Arrangement - The invention relates to a fastening arrangement for fastening a switching device to a mounting tray, the fastening arrangement comprising a fastening point ( | 08-28-2008 |
| 20080204289 | Signal interface circuit - Interface unit for voltage input signals comprising two or more input channels. The input signals of these two or more input channels are connected alternately by an analog multiplexer to an analog-to-digital converter. The A/D converter comprises an integrated sigma-delta modulator circuit which generates a digitized 1-bit signal representing the input signal voltage level for a control unit irrespective of whether the input channel signal is digital or analog. By means of the invention all input voltage channels are made similar such that the input channels of the interface unit can receive an analog or digital signal irrespective of each other. | 08-28-2008 |
