Class / Patent application number | Description | Number of patent applications / Date published |
318254100 | SWITCHED RELUCTANCE MOTOR COMMUTATION CONTROL | 28 |
20080197793 | Control of an electrical machine - A switched reluctance machine has salient poles on the stator and rotor. The windings of the machine are supplied from a converter which provides energisation at a chosen rate. The windings of the machine may be energised at the rate at which the rotor poles pass the stator poles, or it may be operated at a fraction of that rate by energising the windings to cooperate with every second, third or fourth rotor pole. This can extend the output of the machine. | 08-21-2008 |
20080224639 | Method and Device for Commutating Electromechanical Actuators - The invention relates to the commutation of electromechanical, commutatorless actuators, more particularly of permanent magnet motors and reluctance motors, having a rotor and a stator including at least one stator winding (W | 09-18-2008 |
20080231216 | Method for control of a reluctance motor - The invention relates to a method for control of a reluctance motor which has a rotor ( | 09-25-2008 |
20080272719 | Selectively configurable electric motor - A selectively configurable electric motor comprises a stator and a plurality of poles electrically coupled to the stator. The selectively configurable electric motor also includes an actuator separated from the poles by an air gap and configured to move relative to the stator in the presence of an electromagnetic field. The selectively configurable electric motor further includes a plurality of electric conductors, each of the plurality of electric conductors substantially wound around one of the plurality of poles. The selectively configurable electric motor also includes a power converter, at least a portion of which is coupled to the plurality of electric conductors, including a plurality of switching elements configured to selectively couple one or more of the plurality of electric conductors in a predetermined electrical configuration. | 11-06-2008 |
20090001911 | Conduction angle control of a switched reluctance generator - A control system is disclosed. The control system has a switched reluctance generator coupled to provide electrical power through a DC bus to a motor. The control system also has a controller in communication with the switched reluctance generator, the motor, and the DC bus. The controller is configured to receive an indication of an amount torque or power required by the motor, determine a conduction angle of the switched reluctance generator based on the amount of torque or power required by the motor; and energize the DC bus with the electrical power provided by the switched reluctance generator based on the optimal conduction angle. | 01-01-2009 |
20090021192 | Switched Reluctance Machine And Method Of Operation Thereof - The present invention provides an S SRM (switched reluctance machine), which supports one or more phases and each phase comprises a stator, a rotor and coils. The stator is hollow, cylindrical and comprises stator poles extending inwards, such that a recess is formed between adjacent stator poles. The coils are wound on the stator poles and occupy the recess. The rotor is positioned inside the stator and has poles extending outwards. The rotor and stator poles subtend an angle having a maximum value of 0.5 electrical pole pitches at a center of rotation. The different phases are distributed along the axis of the S SRM. The rotor is rotated by a reluctance torque generated by energizing a phase in a current controlled manner until the rotor rotates through a minimum commutation angle required to maintain motion; de-energizing the phase by freewheeling it by using the energy stored in it and simultaneously energizing a second sequentially adjacent phase. | 01-22-2009 |
20090079368 | Electronic Direct Current Intermediate Circuit - The invention relates to an electronic intermediate DC circuit which is to be used in brushless electric motors ( | 03-26-2009 |
20090302787 | Induction and switched reluctance motor - This application describes a motor designed to operate as a reluctance machine at low speeds and as an induction machine at high speeds. The drive waveform is composed of one or more harmonics to be used to match the reluctance pattern of the stator-rotor, causing the rotor to rotate due to the reluctance effect, and one or more other harmonics to induce current in the rotor, causing the rotor to rotate due to the induction effect and the subsequent interaction of the stator and rotor magnetic fields. The two effects are generally not applied simultaneously. | 12-10-2009 |
20130181641 | UNIPOLAR SWITCHING APPARATUS OF SWITCHED RELUCTANCE MOTOR - Disclosed herein is a unipolar switching apparatus of a switched reluctance motor, including: a control unit outputting a unipolar switching control signal; and a transformer driving an SRM according to the unipolar switching control signal output from the control unit, thereby minimizing vibration and noise. | 07-18-2013 |
20140035490 | POWER FACTOR CORRECTION DRIVE CIRCUIT TOPOLOGIES AND CONTROL FOR SWITCHED RELUCTANCE MACHINES - Drive circuits that provide power factor correction and input current waveform shaping for controlling the speed and torque in a switched reluctance machine (SRM). The machine's phase windings are split into two segments, one of which is used for active power factor correction, input ac current waveform shaping and partial torque generation and the other of which is used for torque generation. | 02-06-2014 |
20140055062 | SWITCHING APPARATUS FOR TWO-PHASE SRM AND CONTROL METHOD THEREOF - Disclosed herein are a switching apparatus for a two-phase SRM and a control method thereof. The switching apparatus for a two-phase SRM includes: a rectifier rectifying commercial power; and a zero-voltage switching converter including a pair of upper and lower switches that is vertically connected to each of two phase windings in series and a pair of diodes that is cross-connected across the two phase windings to be operated in operation modes 1 to 3 for each phase winding and provide commercial power supplied from the rectifier to the two-phase SRM so as to operate the two-phase SRM. | 02-27-2014 |
20140184112 | METHOD AND APPARATUS OF CONTROLLING DRIVING OF TWO-PHASE SWITCHED RELUCTANCE MOTOR - Disclosed herein are a method and apparatus of controlling driving of a two-phase switched reluctance motor (SRM). The apparatus includes: a target speed arrival judging unit judging whether or not a current speed of the SRM has arrived at a target speed; a zero volt switching (ZVS) achievement judging unit judging whether or not the SRM is in a state in which ZVS is possible; a negative torque generation judging unit judging whether or not a negative torque has been generated in the SRM; an advanced angle controlling unit judging whether or not an advanced angle will be controlled based on judgment results of the target speed arrival judging unit, the ZVS achievement judging unit, and the negative torque generation judging unit; and a dwell angle controlling unit judging whether or not a dwell angle will be controlled on the judgment results. | 07-03-2014 |
20140265950 | SWITCHED RELUCTANCE MOTOR - A switched reluctance motor (SRM) is disclosed which has a rotor position detecting system with magnetic switches to detect the rotor position and give signals to a logic circuit to trigger electrical phase changes among the coils of the switched reluctance motor. | 09-18-2014 |
20140340006 | Position Sensorless Step-Wise Freewheeling Control Method for Switched Reluctance Motor - A position sensorless step-wise freewheeling control method for a switched reluctance motor having dual switched-mode power converters for each phase doesn't require any additional external hardware, any rotor-position sensor, or storage of flux linkage data of the motor. After the upper and lower tubes of the main switch are switched off, and the phase of the switched reluctance motor enters into a negative voltage forced freewheeling state, the phase current is detected. When the phase current falls to a preset threshold, one of the upper or lower tubes is switched on and the phase enters into a zero voltage natural freewheeling state. When the phase current reaches a peak value, the rotor position becomes the start position of the minimum phase inductance and the rotor position is used as the switch-on position of the main switch. The upper and lower tubes are then switched on. | 11-20-2014 |
20140354196 | MOTOR CONTROLLER - A motor controller configured to control an SRM includes an inverter connected to an SRM, a torque and flux estimator configured to estimate a torque and a flux generated in the SRM as an estimated torque and an estimated flux, based on output from the inverter and a rotor angle of the switched reluctance motor, a switching pattern selector configured to select one of a plurality of switching patterns based on comparing a result of a reference torque and the estimated torque, comparing a result of a reference flux and the estimated flux, and a flux phase angle, and performing switching of the inverter in accordance with a selected switching pattern, and a reference flux calculator configured to obtain the reference flux from a flux trajectory and the rotor angle changing the flux trajectory, the flux trajectory indicating a relationship between the rotor angle and the reference flux. | 12-04-2014 |
20150102751 | MOTOR ACCELERATION APPARATUS AND METHOD - Embodiments of the invention provide a motor acceleration apparatus and a motor acceleration method. According to at least one embodiment, the motor acceleration apparatus includes a rectifier converting household power into direct current (DC) voltage to output the converted DC voltage, a switching converter switching the DC voltage output from the rectifier in an alternating current manner to drive a two-phase switched reluctance motor (SRM), and a microprocessor controlling the switching converter at the time of initial acceleration of the two-phase SRM, so that an initially set dwell angle is changed to a dwell angle in a normal operation state and starting an advanced-angle control. | 04-16-2015 |
20150365035 | APPARATUS FOR DRIVING SWITCHED RELUCTANCE MOTOR AND METHOD OF CONTROLLING THE APPARATUS - There is provided an apparatus for driving a switched reluctance motor (SRM) including: a converter for applying a direct current (DC) voltage supplied from a power supply unit to each phase coil of the SRM via a switching operation; and a processor for controlling a switching operation of the converter based on a driving state of the SRM. | 12-17-2015 |
20160065041 | ELECTRIC MOTOR WITH PLURAL STATOR COMPONENTS - An electric motor apparatus comprises a rotor and a stator formed of at least two stator components, each of the at least two stator components having a substantially hollow cylindrical form. The rotor is mounted within the at least two stator components on a rotational mounting such that the rotor can rotate about a longitudinal central axis with respect to the stator. Each of the at least two stator components has at least two protrusions arranged at different circumferential points on an inner surface of the at least two stator components. Each protrusion has a winding mounted thereon. Control circuitry generates control signals to control power supplied to the windings on each stator component such that power can be controlled to each stator component independently. The stator components are mounted adjacent to each other along the longitudinal central axis and rotationally offset with respect to each other such that the two protrusions on one of the stator components are offset with respect to the protrusions on an adjacently mounted stator component, such that a portion of each winding that extends beyond a longitudinal end of the protrusions on one of the stator components fits within a gap between windings mounted on the adjacently mounted stator component. | 03-03-2016 |
20160072413 | METHOD, COMPUTER PROGRAM PRODUCT AND CONTROLLER FOR STARTING-UP A SWITCHED RELUCTANCE MOTOR, AND ELECTRICAL APPARATUS IMPLEMENTING SAME - A method of starting-up a switched reluctance, SR, motor is provided. The method comprises simultaneously energizing a plurality of phases at a first time point with respective phase voltages that are substantially the same, until the motor rotor is stabilized in alignment with either one of the plurality of phases; simultaneously de-energizing the plurality of phases at a second time point that follows the first time point; monitoring a decrease of respective phase currents in the plurality of phases from a third time point that follows the second time point by a first predetermined time interval; determining a phase of alignment of the rotor using evaluation of the decrease of the phase currents following simultaneous de-energizing of the plurality of phases; and, initiating rotation of the rotor from the determined phase of alignment of the rotor. | 03-10-2016 |
20160079893 | ELECTRICAL MOTOR SYSTEM AND METHOD OF OPERATING THE ELECTRICAL MOTOR SYSTEM - An electrical motor system comprises a switched reluctance electrical motor comprising a rotor section and a stator section, the rotor section comprising a plurality of rotor teeth and the stator section comprising a plurality of stator teeth, the stator teeth wound with respective coils. Coil driver circuitry is coupled to the coils of the stator teeth and controls an independent phase of electrical power to each coil of the plurality of stator teeth. The coils of the stator teeth each have an inductance which absorbs electrical energy provided to that coil by the coil driver circuitry and subsequently releases at least a portion of the electrical energy back to the coil driver circuitry when that coil is not being actively driven by the coil driver circuitry. The coil driver circuitry comprises an electrical energy store configured to store the portion of the electrical energy released back from the inductance of each coil and the electrical energy provided to each coil of the stator teeth by the coil driver circuitry is augmented by the electrical energy stored in the electrical energy store. | 03-17-2016 |
20160087570 | System and Method to Control a Switched Reluctance Machine in Continuous Conduction - A control system for a switched reluctance (SR) machine is disclosed. The SR machine may have a rotor and a stator. The control system may have a converter circuit operatively coupled to the stator and including a plurality of gates in selective communication with each phase of the stator, and a controller in communication with each of the stator and the converter circuit. The controller may be configured to command a fixed dwell of a theta-on angle and a theta-off angle and a varying current command to the plurality of gates when the SR machine is in a continuous conduction mode. | 03-24-2016 |
20160141995 | Flyback Control Mode-Based Controller and Motor-Controlling Method Thereof - A flyback control mode-based controller includes a power supply circuit, a position-checking circuit, a current-checking circuit, a control circuit, and a power output circuit. The power output circuit includes a controlled energy conversion unit. The energy conversion unit includes a control switch and an energy conversion circuit. The energy conversion circuit uses the capacitor C circuit, the inductor L circuit, or the LC circuit to connect parallelly or serially with an inductor in a motor winding L so as to form an oscillation circuit, such that periodic oscillations with attenuation are enabled by relying on the energy stored in the motor winding L. By applying the controller to motors having forward control mode or motors having flyback control mode, the current to be released by the motor during discharging can be repeated used, thereby achieving maximum energy conservation. | 05-19-2016 |
20160181962 | ELECTRIC MOTOR | 06-23-2016 |
20160190967 | MOTOR CONTROLLER - A motor controller which controls a switched reluctance motor (hereinafter referred to as a motor) includes an inverter, a torque computation part, a magnetic flux computation part, and a switching control unit. The switching control unit controls the inverter by using at least a reference torque, which is a torque command value, and a calculated torque. The switching control unit includes a minimum magnetic flux maintenance part. The minimum magnetic flux maintenance part controls the inverter such that a calculated phase magnetic flux of each phase becomes equal to or larger than a predetermined minimum value in a state where the rotational speed of the motor is above a predetermined speed. | 06-30-2016 |
318254200 | Having asymmetric half-bridge | 4 |
20100264858 | PASSIVE CONVERTER FOR DRIVE DEVICE OF SWITCHED RELUCTANCE MOTOR - Disclosed is a passive converter for a drive device of a switched reluctance motor (SRM), in which high demagnetization voltage for the SRM is provided. The converter includes a rectifier which smoothes input voltage to supply DC voltage, a boost circuit connected with the rectifier, and an asymmetric converter connected with the boost circuit, and the boost circuit includes first to third diodes and first and second capacitors. The high demagnetization voltage is generated at current duration of a single phase or poly-phase SRM by using the passive converter for the drive device of the SRM, so that the driving | 10-21-2010 |
20140021889 | Compensating Hysteresis Bands to Hold Specified Switching Frequency - A control system for compensating a hysteresis band of a switched reluctance (SR) machine having a rotor and a stator is provided. The control system may include a converter circuit and a controller. The converter circuit may be operatively coupled to the stator and include a plurality of switches in selective communication with each phase of the stator. The controller may be in communication with each of the stator and the converter circuit, and configured to monitor at least one phase current of the SR machine relative to a current threshold of the hysteresis band, determine an adjustment value based on a difference between the phase current and the current threshold if the phase current exceeds the current threshold, and compensate the current threshold by the adjustment value. | 01-23-2014 |
20140239857 | CONTROL APPARATUS FOR A SWITCHED RELUCTANCE MOTOR - An apparatus for controlling a switched reluctance motor with use of a power conversion circuit. In the apparatus, a command voltage setter sets a command voltage for a coil of the motor, where the command voltage is set to change gradually during either or both of a ramp-up period and a ramp-down period of the command voltage. A voltage controller controls an applied voltage to the coil to the command voltage set by the command voltage setter by operating the power conversion circuit. | 08-28-2014 |
20160043681 | SWITCHED RELUCTANCE MOTOR - A switched reluctance motor includes: a stator provided with a plurality of stator teeth as salient poles in a radial fashion with winding wire wound around each of the plurality of stator teeth; a rotor provided with a plurality of rotor teeth as salient poles in a radial fashion; a driving circuit configured to apply a current to the winding wire for each phase; and a control device configured to control the driving circuit, the control device being configured to perform: starting rising of a current to the winding wire of a stator tooth of a phase being a non-excitation target due to stop of energization to the winding wire; and allowing the current applied to the winding wire of the stator tooth of a phase being an excitation target to fall. | 02-11-2016 |