Entries |
Document | Title | Date |
20080224640 | Brake-controllable brushless motor - A brake-controllable brushless motor has a rotor and a stator having polyphase coils; a polar position detector whereby electric power is supplied to the coil selected by its phase in response to the polar positions of the rotor detected by the polar position detector; a driver division for controlling the electric supply to the coils; a motor pulse identifier for recognizing motor pulse signals fed from the polar position detector; and a delayed pulse generator for producing phase-delayed pulse signals in response to the pulse signals fed from the motor pulse identifier, thereby ensuring that when the brushless motor is braked, the phase delay of the delayed pulse signals is progressively and continuously enlarged, and that the coils receive a controlled electric supply from the driver division in response to the delayed pulse signals. | 09-18-2008 |
20080297080 | Hand-Guided or Stationary Power Tool Having a Drive Unit - A hand-guided or stationary power tool has a drive unit having a motor that includes a rotor having a permanent magnet and a stator and has a motor control designed to trigger the motor in a first rotational speed range according to a voltage-controlled mode and to trigger the motor in a second rotational speed range following the first rotational speed range in the direction of a higher rotational speed according to a field-weakening operation. | 12-04-2008 |
20080303463 | MOTOR CONTROL - A washing machine and a method of operating same is disclosed. A electronically commutated motor for using in a washing machine is also disclosed. The washing machine has an agitator operated by an electronically commutated motor. An agitate cycle of the washing machine is detected. During an agitate cycle, the motor is electronically commutating with two phase firing if the agitator is rotating at rate below a first threshold, or the motor is electronically commutating using an optimised firing angle with three phase firing if the agitator is rotating at rate above a first threshold. | 12-11-2008 |
20090021199 | Motor Driving Integrated Circuit - A motor driving integrated circuit comprising: a speed control circuit configured to control a rotation speed of a motor according to a speed control signal; a detecting circuit configured to detect whether the speed control signal indicates stop of rotation of the motor; and a shut-off circuit configured to shut off power supply to a circuit included in the motor driving integrated circuit when the detecting circuit detects that the speed control signal indicates stop of rotation of the motor. | 01-22-2009 |
20090021200 | Load Driving Apparatus, Vehicle Incorporating the Same, and Control Method for Load Driving Apparatus - An ECU estimates an output allowable power of a power storage device based on the temperature and SOC of the power storage device. The ECU also calculates a threshold power based on the power required to start an engine. When the ECU determines that the output allowable power is lower than the threshold power, the up-converter is controlled such that the boosting rate of the up-converter is restricted to be below a prescribed value. | 01-22-2009 |
20090039809 | MOTOR CONTROL METHOD AND DEVICE - A control device includes a drive control unit that performs control for driving the electromagnetic coil, and a regeneration control unit that performs control for regenerating power from the electromagnetic coil. The drive control unit includes an excitation interval setting unit that sets an excitation interval and a non-excitation interval such that voltage is applied to the electromagnetic coil during the excitation interval while not applied to the electromagnetic coil during the non-excitation interval. The excitation interval has a symmetrical shape whose center corresponds to a π/2 phase point of the induced voltage waveform, and the non-excitation interval has a symmetrical shape whose center corresponds to the π phase point of the induced voltage waveform. The regeneration control unit includes a regeneration interval setting unit that sets a regeneration interval and a non-regeneration interval such that power is regenerated from the electromagnetic coil during the regeneration interval while not regenerated from the electromagnetic coil during the non-regeneration interval. The regeneration interval has a symmetrical shape whose center corresponds to the π/2 phase point of the induced voltage waveform, and the non-regeneration interval has a symmetrical shape whose center corresponds to the π phase point of the induced voltage waveform. | 02-12-2009 |
20090058337 | CONTROL DEVICE AND CONTROL METHOD OF BOOST CONVERTER - A control device of a boost converter which includes: an inverter circuit which controls switching to apply current to a stator winding of respective phases of a multi-phase brushless DC motor; and a boost circuit which is provided on an input side of the inverter circuit and has at least a reactor and a switching element, and controls ON and OFF states of the switching element of the boost circuit on the basis of a boost voltage command which is a command for boost voltage output from the boost circuit, the control device is provided with a boost voltage command setting unit which sets the boost voltage command on the basis of counter electromotive voltage of the brushless DC motor and a torque command for the brushless DC motor. | 03-05-2009 |
20090096394 | ROTARY ELECTRIC SYSTEM WITH STAR-CONNECTED MULTIPHASE STATOR WINDINGS - In a rotary electric system, a switch member includes at least one of a first switch and a second switch. The first switch is connected between a neutral point of multiphase stator windings and a high-side electrode of a direct current power source. The second switch is connected between the neutral point and a low-side electrode of the direct current power source. A controller works to turn the switch member off and on thereby switching control of the multiphase inverter between full-wave driving mode and half-wave driving mode. The full-wave driving mode allows the controller to drive all of the high-side and low-side switching elements per phase of the multiphase stator windings. The half-wave driving mode allows the controller to drive any one of the high-side switching element and the low-side switching element per phase of the multiphase stator windings. | 04-16-2009 |
20090108781 | MOTOR DRIVING APPARATUS, BRUSHLESS MOTOR, AND METHOD FOR DRIVING THE SAME - A motor driving apparatus has first, second, and third positive-side driving transistors having drains which are supplied with a power supply voltage, first, second, and third negative-side driving transistors having sources which are grounded and drains which are connected to sources of the first, second, and third positive-side driving transistors, respectively, a power supply monitoring circuit which monitors the power supply voltage and outputs a driving mode switching signal which has a first value if the power supply voltage is not less than a predetermined value and has a second value if the power supply voltage is less than the predetermined value, and an output PWM control section which switches a mode of driving from synchronous rectification PWM driving to one-way PWM driving on the basis of a change of the driving mode switching signal from the second value to the first value. | 04-30-2009 |
20090115361 | PERMANENT MAGNET MOTOR AND WASHING MACHINE PROVIDED THEREWITH - A permanent magnet motor includes a rotor including a rotor core and a plurality of permanent magnets located inside the rotor core and establishing a plurality of magnetic poles. In the permanent magnet motor, the permanent magnets include a plurality of types of permanent magnets having different coercive forces. The types of permanent magnets are disposed so that each one type constitutes one magnetic pole. | 05-07-2009 |
20090115362 | Electric motor control device, electric vehicle, and hybrid electric vehicle - An electric motor control device includes a direct current power source; an inverter interposed between an electric motor and the direct current power source, the inverter device controlling an exchange of electric power therebetween; an inverter control unit that generates PWM pulses having a duty ratio corresponding to voltage command signals and sends the PWM pulses to the inverter in order to switch the inverter; a frequency changing unit that changes a carrier frequency of the PWM pulses generated by the inverter control unit in a manner corresponding to a frequency control signal; and a motor control unit. | 05-07-2009 |
20090121664 | Open/Close Body Drive Device - The open/close body drive device is capable of restarting a brushless motor, without using magnetic pole sensors, so as to securely drive an open/close body in an arbitrary direction when any of the magnetic pole sensors has failed. When a CPU ( | 05-14-2009 |
20090128069 | Motor Control Apparatus and Control Apparatus for hybrid Electric Vehicles - To provide a motor control apparatus that uses an inverter to drive an AC motor and hybrid automotive control apparatus adapted to drive an AC motor by use of an inverter while reducing torque pulsations during switching from PWM driving to rectangular-wave driving. | 05-21-2009 |
20090195197 | Rotating electrical machine control device - A rotating electrical machine control device includes an inverter; a resolver; a unit; a three-phase/two-phase modulation switching unit; and a motor control unit that switches to a two-phase modulation in a specific region where an electric noise given to the resolver by a rotating electrical machine is large, even in a region where the modulation ratio is smaller than the three-phase/two-phase modulation switching boundary. | 08-06-2009 |
20090230905 | Back Electro-Motive Force (BEMF) Commutation and Speed Control of a Three-Phase Brushless DC (BLDC) Motor - A DC motor comprises a stator having at least three windings coupled to a neutral point; a first pair of upper and lower switches for driving a first winding of the at least three windings to a first voltage or in tristate; a second pair of upper and lower switches for driving a second winding of the at least three windings to a second voltage or in tristate; a third pair of upper and lower switches for driving a third winding of the at least three windings to a third voltage or in tristate, one of the first, second or third windings being in tristate; a back electro-motive force (BEMF) signal generation circuit coupled to receive a BEMF voltage from the winding in tristate; a comparator coupled to receive the BEMF voltage and a zero-crossing voltage representing the voltage at the neutral point at a predetermined time and for comparing the BEMF voltage and the zero-crossing voltage to generate a comparison result; a zero-crossing voltage generation circuit to output the zero-crossing voltage to the comparator; and a commutation controller coupled to receive the comparison result and a speed control signal and for using the comparison result and the speed control signal to generate complementary pulse width modulated (PWM) control signals, one of the complementary PWM control signals for controlling an upper switch and the other of the complementary PWM control signals for substantially simultaneously controlling a lower switch. | 09-17-2009 |
20090237019 | MOTOR DRIVE CONTROL APPARATUS, VEHICLE EQUIPPED WITH MOTOR DRIVE CONTROL APPARATUS, AND MOTOR DRIVE CONTROL METHOD - When a target operation point of either a motor MG | 09-24-2009 |
20090256506 | Drive device for synchronous electric motor - Switching elements are driven by a control signal outputted from a control circuit, so that a rotating magnetic field is generated from a stator coil to rotate a rotor of a synchronous electric motor. The control signal is generated through use of a selected modulation scheme, which is selected from a plurality of modulation schemes. The control circuit determines which one of the modulation schemes is used as the selected modulation scheme based on a sensed voltage value of a voltage sensor, which senses an output voltage of a power supply device. | 10-15-2009 |
20090289585 | MOTOR CONTROL APPARATUS AND MOTOR CONTROL METHOD - A motor control apparatus and a motor control method determine whether the motor is in a back-pressure area so as to provide different rotation-speed control signals. When the fan is in the low duty cycle, a first circuit loop is switched on, so that the fan has more accurate rotation speed. When the fan is in the high duty cycle, a second circuit loop is switched on, so that the rotation speed of fan does not be limited to a constant rotation-speed as the fan enters the back-pressure area. Thus, the fan has larger airflow quantity and higher airflow pressure. | 11-26-2009 |
20090315493 | SINGLE-PHASE BRUSHLESS FORWARD AND REVERSE TURN CONTROL CIRCUIT DEVICE - A single-phase brushless forward and reverse turn control circuit device is provided, in which a PCB is provided on a stator unit and a rotor unit that are mutually encircled and spaced from each other. On the PCB, a microprocessor unit, a logic unit, a drive unit, and at least one sensor are provided. The sensor is provided in the outer circumference of PCB to sense the variation of a magnetic pole of the rotor unit and then transmit it back to the logic unit and supply it to the drive unit, making the drive unit control the current passing through the coils and then the stator unit generate an opposite magnetic field, the rotor unit thereby smoothly running forward or reversely. | 12-24-2009 |
20090315494 | OPTIMIZATION OF MOTOR OPERATION USING A TEST CYCLE - An electronic control system for a motor uses a test cycle to select an optimum mode of operation from a plurality of available modes of operation. In some embodiments, the test cycle produces test data that is compared to information in a library of operating parameters relating to the available modes of operation. An algorithm uses the information in the library of operating parameters to choose an optimum mode of operation. In certain embodiments, the test cycle tries each of the available modes of operation, monitors operational parameters, and determines the best performing mode of operation. | 12-24-2009 |
20090322264 | APPARATUS FOR CARRYING OUT IMPROVED CONTROL OF ROTARY MACHINE - In an apparatus, a first drive unit drives, in a first range of a voltage utilization factor, a switching member to thereby control an output voltage of the power converter to be matched with a command voltage. A second drive unit drives, in a second range of the voltage utilization factor, the switching member to thereby generate a value of a controlled variable of a rotary machine. The second range of the voltage utilization factor is higher than the first range thereof. An estimating unit estimates, during the switching member being driven by the second drive unit, a value of a parameter associated with the output voltage of the power converter. The estimated value is required for the first drive unit to generate the value of the controlled variable generated by the second drive unit. | 12-31-2009 |
20100001670 | SINGLE-CHIP BRUSHLESS MOTOR CONTROLLER - A brushless motor control is provided that includes an application processor and a motor controller chip. The application processor includes a serial interface and is configured to supply, via the serial interface, motor control commands, and to receive, via the serial interface, data representative of motor operational state. The motor controller chip is in operable communication with the application processor, and has formed thereon a motor controller serial interface, a first control, and a second control, which cooperate together to controllably energize a brushless motor. | 01-07-2010 |
20100013421 | DRIVE CONTROLLER AND DRIVE CONTROL METHOD FOR ELECTRIC MOTOR - Control mode switching determination is made as a part of a main loop (control period (Tm)) for overall control of an AC electric motor. Control period (Tc) of a rectangular wave voltage control mode is shorter than the execution period (Tm) of the control mode switching determination. When switching from the rectangular wave voltage control mode to PWM control mode is determined, change in voltage phase of the rectangular wave voltage is inhibited from the timing (time t | 01-21-2010 |
20100033119 | RETROFIT MOTOR SYSTEM FOR HEATING, VENTILATION, AND AIR CONDITIONING APPLICATIONS - A motor control system for heating, ventilation, and air conditioning (HVAC) applications is described. The motor control system includes a thermostat and an electronically commutated motor (ECM) coupled to the thermostat. The ECM is configured to retrofit an existing non-ECM electric motor included in an HVAC application and to operate in one of a plurality of HVAC modes. The HVAC modes include at least one of a heating mode, a cooling mode, and a continuous fan mode. The HVAC mode is determined based at least partially on outputs provided by the thermostat. | 02-11-2010 |
20100052583 | Vehicle equipped with motor and inverter - A vehicle includes a motor for driving wheels WH, an inverter to drive the motor, and a control device to perform PWM control of the inverter. The control device performs synchronous PWM control in a case where an electric current supplied to the motor by the inverter or torque generated in the motor is larger than a threshold value; and performs the synchronous PWM control or non-synchronous PWM control in a case where the electric current or the torque is smaller than the threshold value and sets carrier frequency or a pulse number of the PWM control to be higher than the case where the electric current or the torque is larger than the threshold value. Thereby, it is possible to provide a vehicle of achieving reduction of noise, reduction of cost and improvement of fuel consumption in a balanced manner. | 03-04-2010 |
20100060214 | BLOWER MOTOR FOR HVAC SYSTEMS - A blower motor assembly having a variable speed motor that is suitable for direct, drop-in replacement in a residential HVAC (heating, ventilation, and air conditioning) system that employs a PSC motor. The blower motor assembly includes at least a neutral input and two hot AC line connections, one for connection to the heating power source and the other to the cooling power source. A sensing circuit senses which of the inputs is energized by sensing either voltage or current on the inputs. The sensing circuit delivers a corresponding signal to a motor controller to control the speed of the variable speed motor. The blower motor assembly may also be equipped with additional hot AC inputs, more than one neutral line, and several sensing circuits for sensing current or voltage in the hot inputs and/or the neutral lines for controlling various aspects of the variable speed motor. | 03-11-2010 |
20100060215 | BLOWER MOTOR FOR HVAC SYSTEMS - A blower motor assembly having a variable speed motor that is suitable for direct, drop-in replacement in a residential HVAC (heating, ventilation, and air conditioning) system that employs a PSC motor. The blower motor assembly includes at least a neutral input and two hot AC line connections, one for connection to the heating power source and the other to the cooling power source. A sensing circuit senses which of the inputs is energized by sensing either voltage or current on the inputs. The sensing circuit delivers a corresponding signal to a motor controller to control the speed of the variable speed motor. The blower motor assembly may also be equipped with additional hot AC inputs, more than one neutral line, and several sensing circuits for sensing current or voltage in the hot inputs and/or the neutral lines for controlling various aspects of the variable speed motor. | 03-11-2010 |
20100060216 | BLOWER MOTOR FOR HVAC SYSTEMS - A blower motor assembly having a variable speed motor that is suitable for direct, drop-in replacement in a residential HVAC (heating, ventilation, and air conditioning) system that employs a PSC motor. The blower motor assembly includes at least a neutral input and two hot AC line connections, one for connection to the heating power source and the other to the cooling power source. A sensing circuit senses which of the inputs is energized by sensing either voltage or current on the inputs. The sensing circuit delivers a corresponding signal to a motor controller to control the speed of the variable speed motor. The blower motor assembly may also be equipped with additional hot AC inputs, more than one neutral line, and several sensing circuits for sensing current or voltage in the hot inputs and/or the neutral lines for controlling various aspects of the variable speed motor. | 03-11-2010 |
20100072926 | ROTARY ELECTRIC MACHINE CONTROL SYSTEM - A control unit for a rotary electric machine includes a first current command module, a second current command module, a change module, and a return module. The first module performs a first current command on a maximum efficiency characteristic line on a d-q plane thereby to drive the machine at a maximum efficiency. The second module performs a second current command on a switching line set at a retard angle side relative to the maximum efficiency characteristic line. The change module changes a control mode from a rectangular wave voltage phase control mode to an overmodulation current control mode when an operation point of the machine reaches the switching line. The return module returns the current command from the second command to the first command after performance of the second command for a predetermined period. | 03-25-2010 |
20100072927 | ROTARY ELECTRIC MACHINE CONTROL SYSTEM - A control unit of a rotary electric machine control system includes a stationary switching module and a transitional switching module. The stationary switching module switches over a control mode from a rectangular wave voltage phase control mode to an overmodulation current control mode by using a current phase of a smoothed current produced by filtering of high harmonic components on an actual current in a stationary operation state. The transitional switching module switches the control mode from the rectangular wave voltage phase control mode to the overmodulation current control mode by using the current phase of the actual current in a transitional operation state. The control mode is switched over by comparing the current phase of the actual current with a transitional switching reference line, which is preset separately from a switching reference line used for comparison with a current phase of the smoothed current. | 03-25-2010 |
20100090629 | FLUX CONTROLLED MOTOR MANAGEMENT - A motor in an electric vehicle can be controlled by receiving at least one of a user input or vehicle information, selecting one of a plurality of available flux modes using at least one of the user input or the vehicle information, and calculating a control signal, using the selected flux mode, to control the motor of the electric vehicle. | 04-15-2010 |
20100109587 | AC motor driving circuit and electric car driving circuit - In an AC motor driving circuit from an AC power supply and a DC power supply, a matrix converter and a power conversion circuit are provided. The matrix converter is connected between an output of the AC power supply and an input of the AC motor. In the power conversion circuit, switches back-to-back connected to diodes, and bidirectional switches are series-connected, respectively. Connection junctions between the switches and the bidirectional switches are connected to the input phases of the AC motor, respectively. The other terminal of each switch is connected to one terminal of the DC power supply while the other terminal of each bidirectional switch is connected to the other terminal of the DC power supply. In this manner, the number of switches through which electric power passes at the time of operation is reduced so that loss can be reduced. Accordingly, power conversion efficiency can be improved. | 05-06-2010 |
20100171450 | Composite electromechanical machines with controller - Embodiments of the present invention include a composite electromechanical machine which can operate as a motor, a generator (including dynamo or alternator), or any combination thereof. In an aspect, the present composite electromechanical machine comprises at least a double-sided magnetic plane (e.g., rotor or stator) to form two rotor/stator pairs, together with a controller to configure the multiple rotor/stator pairs. The controller can configure or convert the multiple rotor/stator pairs into motors, generators, or nonoperation, and also can change the windings characteristics of the magnetic planes. The controller can add new functionality and characteristics to the present composite electromechanical machine. Other embodiments can also be included. | 07-08-2010 |
20100171451 | Integrated composite electromechanical machines - Embodiments of the present invention include a composite electromechanical machine which can operate as a motor or a generator (including dynamo or alternator). In an aspect, the present composite electromechanical machine comprises at least double-sided magnetic planes (e.g., rotor or stator) disposed on both sides of a central frames. Other embodiments can also be included. | 07-08-2010 |
20100176757 | CONTROLLER FOR MOTOR DRIVE CONTROL SYSTEM - In a control of an AC motor that uses a PWM control and a rectangular-wave control, when switching is conducted from the rectangular-wave control to the PWM control, a current command generated in a current command generation unit is corrected so as to smooth the variations in a time axis direction on the basis of a target torque command value by taking the final current state in the rectangular-wave control immediately prior to switching as an initial value, thereby generating a current command after the correction. An inverter is current feedback-controlled based on the current command after the correction. As a result, the continuity from the current state immediately prior to switching of the rectangular-wave control can be ensured for the current command in the PWM control. | 07-15-2010 |
20100181949 | MOTOR CONTROL MECHANISM FOR ELECTRIC VEHICLES - An apparatus for controlling a wheel motor is provided. A plurality of switches is provided for controlling a direction of current through motor coils of the wheel motor. A brushless motor control circuit is connected to each of the plurality of switches. Responsive to a request to adjust one of an angular velocity and an angular acceleration of the wheel motor, the plurality of switches are activated to place the motor coils in a predetermined configuration to maximize torque or reduce a total back electromotive force (BEMF) from the motor coils. | 07-22-2010 |
20100231151 | AC MOTOR DRIVE CONTROL DEVICE AND METHOD - An AC motor drive control device includes a control mode judgment unit that performs a judgment based on required voltage amplitude required by a synchronous AC motor, in order to switch units for applying voltage to the AC motor to one of a rectangular wave voltage phase control unit, an overmodulation control unit, and a PWM current control unit. | 09-16-2010 |
20100253254 | WOUND FIELD SYNCHRONOUS MOTOR DRIVE - A hybrid synchronous motor drive circuit and method operates in one or two or more modes based on the speed of the synchronous machine. In a first mode, the synchronous machine is driven at a relatively low frequency by a current controlled voltage source inverter (VSI). In a second mode, the synchronous machine is driven at a relatively high frequency by a load commutated inverter (LCI) in tandem with the VSI. In the second mode, the LCI acts as the main power source for controlling the machine and determining machine torque and speed. The VSI acts as a harmonic compensator by compensating the dominant harmonic currents fed to the machine from the LCI such that the synchronous machine will see sinusoidal currents and thereby sinusoidal voltages at its terminals. The VSI also functions to provide sufficient reactive power at fundamental frequency so that the thyristors in the inverter are load commutated. | 10-07-2010 |
20100253255 | WOUND FIELD SYNCHRONOUS MOTOR DRIVE - A hybrid synchronous motor drive circuit and method operates in one or two or more modes based on the speed of the synchronous machine. In a first mode, the synchronous machine is driven at a relatively low frequency by a current controlled voltage source inverter (VSI). In a second mode, the synchronous machine is driven at a relatively high frequency by a load commutated inverter (LCI) in tandem with the VSI. In the second mode, the LCI acts as the main power source for controlling the machine and determining machine torque and speed. The VSI acts as a harmonic compensator by compensating the dominant harmonic currents fed to the machine from the LCI such that the synchronous machine will see sinusoidal currents and thereby sinusoidal voltages at its terminals. The VSI also functions to provide sufficient reactive power at fundamental frequency so that the thyristors in the inverter are load commutated. | 10-07-2010 |
20100283416 | BRUSHLESS MOTOR DEVICE AND CONTROL DEVICE - A brushless motor device switches between a 120-degree energization method and a 180-degree energization method of advancing an electrical angle by 30 degrees to drive a brushless motor | 11-11-2010 |
20100308759 | Method and Control System for Controlling a Synchronous Electric Machine - A method of controlling an electric synchronous machine ( | 12-09-2010 |
20100327787 | PERMANENT-MAGNET-TYPE ROTATING ELECTRICAL MACHINE - The present invention provides a permanent-magnet-type rotating electrical machine capable of realizing variable-speed operation in a wide range from low speed to high speed at high output and improving, in a wide operating range, efficiency, reliability, and productivity. A narrow magnetic path | 12-30-2010 |
20110080125 | CONTROL DEVICE FOR ELECTRIC MOTOR DRIVE APPARATUS - A electric motor drive apparatus comprising a voltage control unit performing voltage control processing that determines alternating-current voltage command values serving as command values of the alternating-current voltages to be supplied to the alternating-current electric motor and generates switching control signals for the inverter; and a control mode selection unit selecting a synchronous control mode in which a cycle of electric angle of the alternating-current electric motor is synchronized with a switching cycle of the inverter, or an asynchronous control mode in which the cycles are not synchronized with each other. Current detection processing is performed to detect currents flowing in coils of the alternating-current electric motor in every standard calculation cycle that is set to a half of a cycle of the carrier. | 04-07-2011 |
20110089875 | LIMP HOME OPERATIONAL MODE FOR AN ELECTRIC VEHICLE - Methods and apparatus are provided for a limp home operational mode for an electric motor system. The method includes determining whether a resolver has failed. When the resolver has not failed, operation of the electric motor system uses resolver signals. When the resolver fails, operation of the electric motor system uses sensorless rotor position and rotor speed signals. | 04-21-2011 |
20110101900 | METHOD FOR DETERMINING THE INDUCTANCES OF A PERMANENT MAGNET SYNCHRONOUS MACHINE - The invention relates to a control method implemented in a variable speed drive for determining the inductances (Ld, Lq) of a permanent magnet synchronous machine comprising three phases (a, b, c), each oriented along a direction, a stator, and a rotor. For each phase, one after the other, said method includes steps of: applying, along the direction of the phase (a, b, c), a voltage vector (V | 05-05-2011 |
20110109253 | Motor Controlling Circuit for Multiple Control Modes - A motor driving circuit has a motor operated with a forward operation, a reverse operation, an inactivating operation, and/or a brake operation under a constant current mode, a constant voltage mode, and/or a full swing mode. The motor driving circuit also prevents usage of multiple operational amplifiers and errors brought by the usage of the multiple operational amplifiers with simple circuit designs. | 05-12-2011 |
20110115419 | System and Method for Aligning a Rotor to a Known Position - A system and method are presented for aligning a rotor in a motor. The motor may include the rotor and a plurality of pairs of electromagnets. One or more pairs of electromagnets may be excited at a first excitation level. The one or more pairs of electromagnets may be less than all of the plurality of pairs of electromagnets. The excitation of the one or more pairs of electromagnets may be increased to a second excitation level over a first period of time. The excitation of the one or more pairs of electromagnets may be decreased to a third excitation level over a second period of time. Exciting the one or more pairs of electromagnets, increasing the excitation, and decreasing the excitation may cause the rotor to stop in a known position. | 05-19-2011 |
20110115420 | CONTROL DEVICE AND CONTROL METHOD FOR ALTERNATING-CURRENT MOTOR - When performing PWM control in accordance with an overmodulation mode, an ECU variably sets a switching determination value, which is used for determination of switching control modes between the overmodulation mode and a sinusoidal wave modulation mode, based on a switching state of an inverter at present. Then, the ECU compares the degree of modulation, which is calculated from voltage command values, with the switching determination value so as to determine whether to switch to the sinusoidal wave modulation mode or to maintain the overmodulation mode. In particular, when an influence of a dead time is likely to cause generation of a voltage command that requires switching to the overmodulation mode just after switching to the sinusoidal wave modulation mode, the switching determination value is variably set to prevent the transition from the overmodulation mode to the sinusoidal wave modulation mode. This prevents chattering in which the control modes are frequently switched therebetween. | 05-19-2011 |
20110156625 | MOTOR DRIVING APPARATUS AND METHOD FOR CONTROL OF MOTOR REVOLUTION - This invention provides a motor driving apparatus that made it possible to reduce torque ripples including those attributed to load variation of the motor and an associated method for control of motor revolution. An output stage to a multiphase DC motor is comprised of power elements to supply output voltages to multiphase coils and a predriver to supply drive voltages to the power elements. A resistor means detects a current flowing through the power elements. A supply current detector detects a voltage signal produced across the resistor means as a supply current, using a high-speed ADC and a moving average filter. An output controller generates a PWM signal with a frequency lower than the frequency of the high-speed ADC so that the current detected by the supply current detector conforms to a current signal indicating a motor revolving speed and transfers the PWM signal to the output stage. | 06-30-2011 |
20110234131 | METHOD AND APPARATUS FOR CONTROLLING PULSE-WIDTH MODULATION IN AN ELECTRIC MOTOR - In a method of controlling current in a control circuit of an electric motor, pulse-width modulation (PWM) pulses are applied to a stator of the electric motor, via a plurality of transistors of the control circuit, using a first control mode when a rotational speed of a rotor of the electric motor is within a first range. At least one PWM pulse is applied to the stator, via a subset of the plurality of transistors, using a second control mode when the rotational speed of the rotor is within a second range. When it is determined that the rotational speed of the rotor has changed from being within the second range to being within the first range, additional PWM pulses are applied to the stator such that, for each of the plurality of transistors, a current through the transistor does not exceed a maximum current capacity of the transistor. | 09-29-2011 |
20110241583 | CONTROL DEVICE OF MOTOR DRIVING APPARATUS - Disclosed is a control device capable of ending strong field control in a structure that performs strong field control and square wave control on the basis of a voltage index, such as a modulation factor. A voltage waveform control unit performs PWM control when a voltage index is less than a threshold, and performs square wave control when the voltage index is equal to or greater than the threshold value. A field adjusting unit performs strong field control when the voltage index is equal to or greater than a predetermined strong field threshold value less than the square wave threshold value. A mode control unit ends the strong field control when a field adjustment command value is equal to or greater than an adjustment command threshold value determined on the basis of a target torque and a voltage/speed ratio in a direction in which field flux is strengthened. | 10-06-2011 |
20110241584 | CONTROL DEVICE OF MOTOR DRIVING APPARATUS - Disclosed is a control device capable of ending strong field control based on a voltage index, such as a modulation factor. A voltage waveform control unit performs PWM control when a voltage index indicating the magnitude of voltage command values with respect to a DC voltage is less than a predetermined square wave threshold value, and performs square wave control when the voltage index is equal to or greater than the threshold. A field adjusting unit performs strong field control on the condition that the voltage index is equal to or greater than a predetermined strong field threshold value less than the square wave threshold value. A mode control unit ends the strong field control when a rotational speed is less than a rotational speed threshold value determined on the basis of a target torque and the DC voltage. | 10-06-2011 |
20110241585 | DIRECT-CURRENT TO THREE-PHASE ALTERNATING-CURRENT INVERTER SYSTEM - A DC to three-phase AC inverter system includes a three-phase motor, an inverter circuit, switching elements, a capacitor, a DC power source and a control circuit. The DC power source is connected to the three-phase motor at a neutral point thereof. The control circuit calculates voltage commands, first through third divided boost commands by dividing a boost command, and first through third drive signals based on the voltage commands and the first through third divided boost commands. The second and third divided boost commands are used when the PWM control is performed by turning on and off the switching elements for the second and third phases while the switching elements for the first phase continues to be on or off state is set larger than those used when the PWM control is performed by turning on and off the switching elements for the first through third phases. | 10-06-2011 |
20110291596 | Method and Apparatus for Controlling Motor Torque - The subject matter disclosed herein describes a system for controlling torque in a soft starter. In particular, torque ripple is reduced when transitioning between two different operating modes of a soft starter. A soft starter may include a first operating mode, designed for improved performance during low-speed operation of a motor, and a second operating mode, designed for improved performance during high-speed operation of the motor. However, transitioning between two different operating modes may result in significant transient currents in the motor, which, in turn, produce torque in the motor. The system described herein reduces this transient torque production in the motor. | 12-01-2011 |
20120032620 | CONTROL DEVICE - A control device that controls for an electric motor drive device including a DC/AC conversion section that converts a DC voltage into an AC voltage to supply the AC voltage to an AC electric motor. The control device is configured with a computation cycle setting section that sets a computation cycle of the control signal generation section to a first cycle, which is N times (N is an integer of 1 or more) a reference computation cycle that is set to half a carrier cycle, and that sets a computation cycle of the voltage command value determination section to a second cycle, which is M times (M is an integer of 2 or more) the first cycle, in the case where the control mode determined by the control mode determination section is the pulse width modulation control mode. | 02-09-2012 |
20120074881 | METHOD AND SYSTEM FOR ELECTRONIC BRAKING OF A MOTOR - A power tool includes a housing, a brushless DC motor housed inside the housing, a power supply, a control unit, and an input unit such as a trigger switch actuated by a user. The control unit controls the commutation of the motor through a series of power switches coupled to the power supply. The control unit initiates electronic braking of the motor after occurrence of a condition in the input unit, such as trigger release or reduced speed, indicative of the power tool shut-down. A mechanism is provided to power the control unit for a predetermined amount of time after the detection of the condition from the input unit in order to complete the electronic braking of the motor. | 03-29-2012 |
20120081047 | CONTROL DEVICE OF A DRIVING APPARATUS - A control device for a driving apparatus. The control device is configured with a device that controls the rotary electric machine via the inverter, a device that determines whether a disconnect condition of the main power supply is satisfied, and a device that obtains an estimated field amount that is an estimated value of the field flux supplied from the rotor to the stator. The control device is also configured with a device calculates an induced voltage that is induced in the coil, and a device that determines whether an overvoltage state in which the induced voltage exceeds a voltage resistance of the inverter exists. If it is determined that an overvoltage state exists when the disconnect condition is satisfied, connection with a main power supply is maintained until the overvoltage state is eliminated. The rotary electric machine is controlled by weakening the field flux to the coil. | 04-05-2012 |
20120081048 | MOTOR ABLE TO WORK SYNCHRONOUSLY AND AS INDUCTION MOTOR - The present invention relates to a motor that acts both as a synchronous motor and as an induction motor, and that comprises a stator ( | 04-05-2012 |
20120098471 | ELECTRICAL SYSTEM AND METHOD FOR CONTROLLING AN ELECTRICAL MOTOR - An electrical system comprising an electrical motor and a method for controlling the electrical motor. The system comprises the electrical motor, a power source connection, a first motor control device placed between the power source connection and the motor, and a second motor control device placed in parallel with the first motor control device, the first motor control device supplying electrical power to the motor at least one first operating condition of the motor, and the second motor control device supplying electrical power to the motor at least one second operating condition of the motor, wherein the at least one first operating condition differs from the at least one second operating condition of the motor. | 04-26-2012 |
20120112674 | CONTROL OF A TRACTION POWER INVERTER MODULE IN A VEHICLE HAVING AN ELECTRIC TRACTION MOTOR - A method for controlling a traction power inverter module (TPIM) in a vehicle includes determining a commanded output torque of the motor using a controller. The method further includes controlling the TPIM and motor using a discontinuous pulse width modulated (DPWM) signal when the commanded output torque is less than a calibrated torque threshold. A continuous pulse width modulated (CPWM) signal is used when the commanded output torque is greater than the threshold. The method may include determining a direction of a change in the commanded output torque, and controlling the TPIM, via the controller, using the DPWM signal only when the commanded output torque drops below a predetermined hysteresis level. A vehicle includes a traction motor producing a motor torque for propelling the vehicle, an ESS, a TPIM, and a controller configured as noted above. | 05-10-2012 |
20120262098 | Method for Operating a Drive Unit, and a Drive Unit - In a method for operating a drive unit having an electric machine, in a normal operating mode the electric machine is operated with current provided by an inverter on at least two phases, and particular phase voltages for the electric machine are set on the phases. Upon an occurrence of an error of the inverter, the inverter is operated in an emergency operating mode for the further operation of the electric machine. | 10-18-2012 |
20120280641 | DEVICE FOR CONTROL OF A PMSM - A permanent magnet synchronous machine (PMSM) includes a stator and rotor powered by an inverter. A device to control the PMSM includes a sensor to sample a measurement θ | 11-08-2012 |
20130069570 | PWM Strategy for Reduction of Inverter Hotspot Temperature and Overall Losses - A PWM strategy can be implemented to reduce device power losses and hotspot temperature in an inverter circuit that drives a synchronous motor. A method includes migrating a phase current from a power device with higher losses to a power device with lower losses. A PWM modulation signal can be modified to alter the inverter duty cycle and migrate phase current in the direction of lower losses. As an example, a PWM reference signal can be shifted to a lower value. A PWM loss reduction strategy can be performed while a motor is in a rotor-lock state to reduce device hotspot temperature. The PWM loss reduction strategy can also be performed when a motor is operating in a normal state, pushing PWM to DPWM, reducing switching and overall losses. The strategy can be practiced while a PMSM is operating as a motor, and can also be practiced during regenerative braking. | 03-21-2013 |
20130127383 | INVERTER APPARATUS AND INVERTER CONTROL METHOD - An inverter apparatus basically includes an inverter, a rotational speed detecting component and a control component. The inverter includes a plurality of pairs of switching elements. The control component controls an on-off status of the switching elements to convert a direct current from a direct current power source into alternating current by alternately executing first and second controls when a rotational speed of a motor connected to the switching elements is larger than a prescribed rotational speed. The first control turns on the switching elements that are directly connected to a positive electrode of the power source, and turns off the switching elements that are directly connected to a negative electrode of the power source. The second control turns on the switching elements that are directly connected to the negative electrode and turns off the switching elements that are directly connected to the positive electrode. | 05-23-2013 |
20130221880 | MOTOR DRIVING CIRCUIT AND MOTOR APPARATUS - The motor driving circuit includes a driving controlling signal generating circuit that controls a driver with a driving controlling signal. The motor driving circuit includes a detecting circuit that outputs a first voltage signal based on a driving current flowing to the driver in a case where the motor is being driven by direct-current excitation driving. The motor driving circuit includes a calculating circuit that removes a direct-current component from the first voltage signal and outputs a resulting second voltage signal. The motor driving circuit includes a determining circuit that determines, based on an amplitude of the second voltage signal, whether or not to make the motor transition from the direct-current excitation driving to forced commutation driving and outputs a determination signal according to a result of the determination to the driving controlling signal generating circuit. | 08-29-2013 |
20130221881 | DRIVING APPARATUS AND DRIVING METHOD - A driving apparatus is configured to switch states in one modulation period so as to include a conductive state in a first drive direction, a conductive state in a second drive direction having a polarity different from the conductive state in the first drive direction, and a ground state at least when a motor output is in a low output region including a case where a duty ratio of a PWM control is at zero, in which the duty ratio is changed by changing periods of the respective states. | 08-29-2013 |
20130234634 | Controlling A Multiphase Brushless DC Motor For STaging And Driving A Remote-Control Vehicle - Control of rotational speed of a motor is provided using an apparatus and method that provides a staging and a driving mode. A processor controls speed of the motor in three different modes to provide different control that is appropriate for different situations. Control-input indications are received by a processor indicating that a stepping mode is selected. In stepping mode, a sequence of commutation states are chosen in succession at a given stepping frequency for a given control selection. In an active-holding mode, the same phase in the commutation sequence is pulsed at low power to hold a motor location. In a closed-loop motor-control mode, the commutation state is sensed and state transition time is controlled relative to neutral timing. These modes may be used to advantage to simulate a drag race. An operator controls a remote-control vehicle in a stepping mode to drive toward a first beam at a drag start line. When the first beam at the start line is broken, but a second beam is not broken, the ESC begins to perform motor control to actively hold the vehicle in position until the race starts. After the race starts, the ESC receives a control-input indication to drive the motor in a closed-loop motor-control mode. | 09-12-2013 |
20130249454 | DRIVING APPARATUS FOR MULTIPLEX-WINDING ROTARY MACHINE - Provided are rotational position detection means detecting the rotational position of a multiplex-winding rotary machine; failure determination means determining failure of the rotational position detection means; control means calculating a voltage instruction for each winding group, based on the rotational position detected by the rotational position detection means; and voltage application means applying voltage to each winding group, based on the voltage instruction. According to the failure determination by the failure determination means, the control means outputs a voltage instruction for rotational position estimation to the voltage application means, and estimates the rotational position θe, based on at least one of voltage and current obtained from the winding group in accordance with the voltage instruction. | 09-26-2013 |
20140028226 | BRUSHLESS DIRECT-CURRENT MOTOR AND CONTROL FOR POWER TOOL - Brushless direct-current (“BLDC”) motor and control for a power tool. A BLDC motor of a power tool is controlled in either a pulse-width modulation (“PWM”) commutation mode or a centerline commutation mode. When the motor is rotating slowly, the motor is operated using PWM commutation. When the motor is rotating at a speed greater than a threshold speed value, the operation of the motor is transitioned to the centerline commutation mode. When operating in the centerline commutation mode, the high-side field-effect transistors (“FETs”) and low-side FETs can each be used for motor speed control. By switching between speed control using the high-side FETs and speed control using the low-side FETs, the heat generated by freewheeling currents can be approximately evenly distributed among the high-side and low-side FETs. | 01-30-2014 |
20140042941 | MATRIX INTEGRATED SEQUENTIAL MAGNETIC ATTRACTION ELECTRIC MACHINE - The invention discloses a reciprocal radial field electric machine based on the soft magnetic attraction principle, characterized by a plurality of active elements organized as a bi-dimensional cylindrical machine matrix and fed sequentially by an external power converter in order to derive a motoring or generation effect. The machine is comprised of a fixed stator matrix featuring salient poles and electrical coils, and a mobile rotor matrix featuring salient poles. The machine works on the principle of time integration of the discrete actions performed by its active elements. The bi-dimensional matrix organization of the active elements and the algorithms of their activation in both motoring and generation modes are key features for the functional cohesion of the machine. The design of this machine is based on a unique digital modeling method developed by the inventors, using exclusively the matrix calculus adapted to cylindrical matrices. | 02-13-2014 |
20140049198 | Power Conversion Device - A power conversion device includes a power switching circuit that supplies AC voltages generated between switching elements operating as upper arms and switching elements operating as lower arms, and a control circuit that generates and supplies to the driver circuit signals for controlling the switching operation of the switching elements by a PWM method in a first operational region in which frequency of an AC power to be outputted is low, and that generates and supplies to the driver circuit signals for controlling the switching operation of the switching elements at timings based upon the phase of the AC power to be outputted in an operational region in which the frequency of the AC power to be outputted is higher than in the first operational region. | 02-20-2014 |
20140049199 | MOTOR CONTROL DEVICE, MOTOR CONTROL METHOD, AND IMAGE FORMING APPARATUS - A motor control device supplies a drive control signal to a drive circuit that drives a motor at a constant period using a motor drive signal based on the drive control signal, and shuts off the motor drive signal when a count value counted by a counter that reset the count value if a state of the motor changes exceeds a threshold corresponding to a plurality of driving periods of the motor. The motor control device includes: a control unit that controls a setting unit to set a rotational direction of the motor to a first rotational direction and a second rotational direction reverse to the first rotational direction at the constant period alternately, when a drive mode of the motor is a position holding mode to drive the motor so as to hold a rotational position of the motor. | 02-20-2014 |
20140084823 | MOTOR CONTROLLING DEVICE AND MOTOR CONTROLLING METHOD - There are provided a motor controlling device and a motor controlling method. The motor controlling device includes: an open loop driving unit performing open loop controlling using a pulse width modulation (PWM) signal; a closed loop driving unit performing feedback controlling using a difference between a current speed of a motor and the PWM signal; and a driving controlling unit calculating a duty ratio of the PWM signal and comparing the calculated duty ratio with a preset reference duty to thereby control any one of the open loop driving unit and the closed loop driving unit to operate signal. | 03-27-2014 |
20140084824 | Sensorless Driving Apparatus and Sensorless Driving Method for Brushless Motor - The present relates to a sensorless driving apparatus and a sensorless driving method for a brushless motor. In a state that the brushless motor is driven by rectangular waves, when the driving apparatus detects that a rotation speed of the brushless motor becomes higher than a predetermined speed and thereafter it detects that an angle of a rotor of the brushless motor becomes a predetermined angle, the driving apparatus switches the drive from rectangular wave drive to sign wave drive. The driving apparatus sets as the predetermined angle an angle at which energizing mode is switched in the rectangular wave drive or an angle at which a motor torque is at a peak value in the rectangular wave drive. | 03-27-2014 |
20140103842 | PORTABLE CONTROLLER WITH INTEGRAL POWER SOURCE FOR MECHANICAL CIRCULATION SUPPORT SYSTEMS - A portable external device for a mechanical circulation support system includes first and second power sources, e.g. batteries and control electronics for redundant uninterrupted operation of an implantable blood pump. The control and power source module may be configured to accommodate a variety of wearable configurations for patient convenience and comfort. | 04-17-2014 |
20140111126 | Adaptive E-Drive Operation for Electrified Vehicle - A system is configured to receive vehicle state input, and in response to the vehicle state input, select an operational mode for PWM switching of electronics in a power conversion circuit of a hybrid electric vehicle electric drive system (EDS). Vehicle state input can pertain to EDS state, engine state, and the presence of alternative noise sources, such as audio equipment, climate control equipment, and lowered windows. Various operational modes can include a noise reduction mode in which EDS noise is reduced, a loss reduction mode in which EDS losses are reduced, and a default mode, which can be designed to maximize fuel efficiency. A system can be configured to provide a PWM implementation strategy based on operational mode selection. By way of example, a PWM implementation strategy can comprise random PWM, continuous PWM, discontinuous PWM and fixed frequency PWM. | 04-24-2014 |
20140167663 | LOAD DRIVE CONTROL SYSTEM FOR HYBRID VEHICLE AND METHOD OF CONTROLLING HYBRID VEHICLE - A load drive control system for a hybrid vehicle includes a zero current control execution device and an error compensating device. The zero current control execution device is configured to control a converter to output a substantially constant raised voltage that is higher than an inductive voltage generated in an electric motor. The error compensating device is configured to compensate for an attachment error of a first position detector based on a d-axis voltage command value for the electric motor calculated during zero current control. | 06-19-2014 |
20140184116 | APPARATUS FOR MOTOR CONTROL SYSTEM AND ASSOCIATED METHODS - A motor control apparatus to control a motor external to the motor control apparatus includes a microcontroller unit (MCU). The MCU includes mixed signal motor control circuitry adapted to perform back electromotive force (EMF) motor control in a first mode of operation. The mixed signal motor control circuitry is further adapted to perform field oriented control (FOC) in a second mode of operation. | 07-03-2014 |
20140300300 | Method For Controlling A Brushless Electric Motor - The invention describes a method for controlling a sensorless, brushless DC motor that is controlled via a bridge circuit preferably using pulse width modulation (PWM) having precommutation. According to the invention, in the braking operation each commutation interval is divided into two phases. A drive phase, lasting from the start of the commutation interval up to zero crossing in which the motor is controlled with the normal PWM, and a braking phase, lasting from zero crossing up to the next commutation time in which at least two motor phases are short-circuited and/or in which the PWM is operated with recovered energy. The efficiency of the control circuit is as low as possible so as to ensure that the braking energy is consumed in the control circuit. | 10-09-2014 |
20140300301 | Motor and Switching Apparatuses, Systems and Methods - Unique motor drive apparatuses, systems and methods are disclosed. One exemplary embodiment is an apparatus comprising an AC-DC power supply structured to couple with and drive an electric motor. A sampling and switching device is coupled with the power supply. The switching device is configured to sample an electrical condition of a plurality of power line inputs and to selectably connect the power supply with the plurality of power line inputs. A controller is operatively coupled with and structured to control the switching device in a first mode in which the controller determines a power at which to operate the motor based upon which of the plurality of power line inputs receives power and a second mode in which the controller provides power factor correction of the motor and selects the power line inputs connected to the AC-DC power supply by the sampling and switching device. | 10-09-2014 |
20140300302 | VEHICLE AND METHOD OF CONTROLLING VEHICLE - A vehicle includes a motor generator generating driving power for running, and an ECU. The ECU performs driving power variation operation on the motor generator in which the motor generator is switched between a first state (acceleration running) and a second state (inertial running) when power requested by a user varies within a prescribed range to run the vehicle. In the first state, the motor generator generates driving power. In the second state, the motor generator generates driving power smaller than the driving power in the first state. The ECU controls the motor generator in such a manner that the driving power during the acceleration running has a non-rectangular shape. As a result, gradual variation in driving power can be provided at the time of switching between the acceleration running and the inertial running, to improve drivability. | 10-09-2014 |
20140368138 | METHOD OF CONTROLLING A BRUSHLESS PERMANENT-MAGNET MOTOR - A method of controlling a brushless permanent-magnet motor. The method includes dividing each half of an electrical cycle of the motor into a conduction period followed by a primary freewheel period. The conduction period is then divided into a first excitation period, a secondary freewheel period, and a second excitation period. The method then involves exciting a winding of the motor during each excitation period and freewheeling the winding during each freewheel period. The secondary freewheel period has a position and length within the conduction period that acts to reduce the harmonic content of current in the winding relative to back EMF in the winding. As a result, the efficiency of the motor is improved. | 12-18-2014 |
20150008854 | Quadrant Change Control in Brushless DC Motors - A method and apparatus for controlling a change in a quadrant of operation of a brushless direct current motor. A quadrant change in an operation of a motor is identified. In response to identifying the quadrant change, selected ones of a plurality of switches in a switch bridge are selected to be controlled to couple a direct current power source to the windings of the motor to change a direction of an actual current in the windings. | 01-08-2015 |
20150008855 | CONTROLLER FOR A BRUSHLESS MOTOR - A controller for a brushless motor that is configured to operate in normal mode or under-voltage mode. When operating in normal mode, the controller generates control signals for exciting a winding of the motor, monitors the magnitude of an input voltage, and switches to under-voltage mode in the event that the input voltage drops below an under-voltage threshold. When operating in under-voltage mode, the controller suspends excitation of the winding, monitors the magnitude of the input voltage, monitors the magnitude of a supply voltage used to power the controller, switches to normal mode in the event that the input voltage exceeds a restart threshold, and resets itself in the event that the supply voltage drops below a brown-out threshold. | 01-08-2015 |
20150318803 | HYBRID PULSE WIDTH MODULATION METHOD FOR VARIABLE SPEED DRIVE - A system or method controlling a variable speed drive based on PWM techniques, wherein a first PWM method is used when the input current is less than a predetermined threshold value, for higher efficiency and lower total harmonic distortion (THD); and a second PWM method comprising a discontinuous modulation signal is used when the input current is greater than the predetermined threshold value for higher efficiency. By doing so, the maximum efficiency of VSD within the whole operation range can be achieved. | 11-05-2015 |
20160049890 | BRUSHLESS DIRECT-CURRENT MOTOR AND CONTROL FOR POWER TOOL - Brushless direct-current (“BLDC”) motor and control for a power tool. A BLDC motor of a power tool is controlled in either a pulse-width modulation (“PWM”) commutation mode or a centerline commutation mode. When the motor is rotating slowly, the motor is operated using PWM commutation. When the motor is rotating at a speed greater than a threshold speed value, the operation of the motor is transitioned to the centerline commutation mode. When operating in the centerline commutation mode, the high-side field-effect transistors (“FETs”) and low-side FETs can each be used for motor speed control. By switching between speed control using the high-side FETs and speed control using the low-side FETs, the heat generated by freewheeling currents can be approximately evenly distributed among the high-side and low-side FETs. | 02-18-2016 |
20160056739 | APPARATUS FOR CONTROLLING ROTARY MACHINE - In a control apparatus, an extractor extracts, from a rotational speed of a rotating member, a vibration component included in the rotational speed of the rotating member. A first suppressor performs first suppression to suppress the rotational speed of the rotating member from changing due to change of a speed change ratio. A mode setter switchably sets one of an enabling mode to enable the first suppression or a disabling mode to disable the first suppression in the control apparatus according to a parameter indicative of the speed change ratio. A second suppressor performs second suppression to suppress change of the vibration component generated based on switching of one of the enabling mode and the disabling mode to the other thereof. | 02-25-2016 |
20160094167 | BLDC MOTOR SYSTEM INCLUDING PARAMETER DETECTING CIRCUIT AND OPERATING METHOD THEREOF - Provided is a BrushLess Direct Current (BLDC) motor system including a motor driving circuit configured to control a pulse-width-modulation (PWM) inverter in a first operation mode or a second operation mode according to a control signal, and output a switching signal according to each operation mode, the PWM inverter configured to receive the switching signal to output first three-phase voltages having a first frequency in the first operation mode, and output second three-phase voltages having a second frequency in the second operation mode, a sensorless BLDC motor configured not to operate in the first operation mode by operating based on three-phase voltages having a frequency in a different band from the first frequency, and operate in the second mode by operating based on three-phase voltages having a frequency in an identical band to the second frequency, and a parameter detecting circuit configured to calculate parameter information on the sensorless BLDC motor in the first operation mode by using sensing voltages sensed in the PWM inverter. | 03-31-2016 |
20160105138 | MOTOR DRIVE DEVICE - When a control device determines, based on a sampling number in one period of a target modulation factor waveform, that the sampling number is less than a predetermined value in a case where a two-phase modulation scheme is selected and the target rotation number increases, the control device switches a modulation scheme from the two-phase modulation scheme to a three-phase modulation scheme. | 04-14-2016 |
20160380569 | DEVICE AND METHOD FOR OPERATING AN ELECTRIC MACHINE - The present invention provides a device and a method for changing over an electric machine from the regular operating mode into the open-circuit mode. In order to avoid excessive increases in voltage and associated adverse effects on the electric machine and the other components, in particular batteries, a further control phase is introduced between the end of the regular operating mode and the freewheeling mode, during which further control phase the voltage at the terminals of the electric machine is continuously adjusted from the voltage previously set in the regular operating mode to the expected open-circuit voltage of the electric machine. | 12-29-2016 |
20170234556 | RETROFIT MOTOR SYSTEM FOR HEATING, VENTILATION, AND AIR CONDITIONING APPLICATIONS | 08-17-2017 |
20180026558 | Motor Control Circuit, Motor Drive Control Apparatus And Control Method Of Motor Drive Control Apparatus | 01-25-2018 |