Abstract: Some embodiments provide an apparatus for controlling the motion of a camera component. In some embodiments, the apparatus includes an actuator module. The actuator module includes a plurality of magnets. Each magnet of the plurality of magnets is poled with magnetic domains substantially aligned in the same direction throughout each magnet. The apparatus further includes a coil rigidly disposed around a lens. Each magnet of the plurality of magnets contributes to the forces to adjust focus of the lens based on Lorentz forces generated from the coil.

Abstract: Disclosed herein is a control circuit of a three-phase DC motor used along with an external resistance and a three-phase inverter. The control circuit includes a current detection circuit that generates a first current detection value indicating an amount of current of a first current flowing through a first phase of the three-phase inverter. The current detection circuit can generate the first current detection value, based on a voltage drop of a resistance component of a wire existing on a path of the first current, the wire being formed from a material containing copper, or based on a voltage drop of a first resistance that is an on-resistance of an arm of the first phase, and can use, as a standard, a current detection value based on a voltage drop of the external resistance to calibrate the first current detection value based on the voltage drop of the first resistance.

Abstract: A control device which includes a power conversion circuit configured to supply driving power to an electric motor, a magnetic flux estimation circuit configured to estimate a primary magnetic flux of the motor, and a voltage command generation circuit (control circuit) configured to control the conversion circuit based on an estimation result of the primary magnetic flux, in which the estimation circuit performs, when an operating speed of the motor is less than a predetermined level, a first estimation of estimating the primary magnetic flux based on an output current to the motor and an inductance thereof, and performs, when the speed exceeds a predetermined level, a second estimation of estimating the primary magnetic flux by estimating a magnetic flux differential value based on an output voltage of the conversion circuit and integrating the value using, as an initial value, an estimation result by the first estimation.

Abstract: To provide a controller for AC rotary electric machine which can compensate error of the actual on-duty with respect to the command on-duty calculated from command voltage with good accuracy, with a simple circuit configuration. A controller for AC rotary electric machine detects an actual on-duty of the switching device based on the detection value of the midpoint potential which is the potential of the connection node of the series connection in the series circuit; calculates an on-duty error based on the difference between the command on-duty and the actual on-duty; and corrects the voltage command or the command on-duty based on the on-duty error.

Abstract: A method for detecting low impedance condition at an output (15) of an electrical converter (10), a control unit (1000), a computer program product, and an electrical converter (10) are presented. The method includes determining (110) a first current value (I1(T1)) of a first current (I1), and a second current value (I1(T2)) of the first current (I1), and determining (120) a first current difference (?I1) between the first (I1(T1)) and the second (I1(T2)) current values, and comparing (130) the first current difference (?I1) to a first current difference threshold (I1_TH), and if the first current difference (?I1) is of predefined magnitude with respect to the first current difference threshold (I1_TH), such as higher, turning off (140) a first voltage (U1) driving the first current (I1), such as by switching off a corresponding switch or switches for applying the first voltage (U1) to the output (15).

Abstract: A motor drive apparatus includes a motor, a power converter, and a controller that controls the voltage supplied to the motor by the power converter. The power converter converts a voltage of a 400 V-class AC power supply to a voltage with an effective value lower than an effective value of the 400 V-class AC power supply. The power converter converts the voltage by a switching operation of a plurality of switching elements. The motor is configured so that a value of ?×Vx/Ld is greater than Pmax when an effective value voltage Vx=200 V. A d-axis inductance of the motor is Ld. A flux linkage of the motor is ?. A maximum output of the motor in a device where the motor is mounted is Pmax. The controller has a control mode in which an effective value voltage higher than Vx is applied to the motor.

Abstract: A system and method for integrated electrification of vehicle accessories conventionally driven by an internal combustion engine includes an electric motor coupled to a common accessory drive that drive a plurality of accessories, such as a power steering pump, an air conditioning compressor, an air compressor, a thermodynamic heater and/or a coolant pump. The integrated electrified accessory unit preferably has the electric motor, accessory drive and accessories arranged in a common housing which is configured to be mounted to a chassis frame rail of the vehicle, the common housing including wall penetrations which facilitate rapid connection of the accessories to external lines of the vehicle.

Abstract: A motor controller includes a motor drive unit configured to drive and control a motor, an electrical discharge control unit configured to perform control in which regenerative power from the motor is consumed by a regenerative power discharge resistor, and a housing formed to accommodate the motor drive unit and the electrical discharge control unit, wherein at least a part of the housing is configured as the regenerative power discharge resistor.

Abstract: Selective efficiency multi-phase traction inverters and chargers as heat sources for thermal conditioning of electric vehicles is provided. The traction inverter comprises a plurality of phases, each of the plurality of phases having at least one semiconductor switching device, the at least one semiconductor switching device configured to switch between at least three differing states, for thermal management of the electric vehicle components and compartments. The traction inverter includes a controller coupled to the plurality of phases, to operate the plurality of phases in a first mode of the traction inverter to drive the electric motor as a traction motor. The controller operates the plurality of phases in a second mode of the traction inverter as a first type of converter. The controller to operate the plurality of phases in a third mode of the traction inverter as a second type of converter.

Abstract: A motor apparatus for a switch drive of an electric switch has an electric motor and a control apparatus for controlling the electric motor. The control apparatus has a power supply device for the electrical power supply of the electric motor. The electric power supply has a rectifier unit, a voltage measurement unit for detecting the supply voltage or a rectifier output voltage of the rectifier unit, a switch unit for generating a drive voltage for the electric motor from the supply voltage or from the rectifier output voltage, and a control unit for controlling the switch unit as a function of the supply or rectifier output voltage detected. Accordingly, the motor apparatus has a motor housing which, besides the electric motor, houses part of the power supply device and/or at least part of the control unit.

Abstract: A control circuit for an NPC-type three-level converter is provided. Each phase bridge arm of the NPC-type three-level converter includes multiple IGBT devices. For each phase bridge arm, a control circuit corresponding to the phase bridge arm includes an off-time control circuit and a timing control circuit. The off-time control circuit is configured to reserve a preset time period for turn-off of the multiple IGBT devices in the corresponding phase bridge arm. The timing control circuit includes a first sub-circuit and a second sub-circuit, and each sub-circuit of the first sub-circuit and the second sub-circuit includes: a first fixed delay circuit, a second fixed delay circuit, a first AND gate circuit and a first OR gate circuit. For each sub-circuit, output terminals of the first AND gate circuit and the first OR gate circuit serve as output terminals of the timing control circuit, respectively.

Abstract: Embodiments of present disclosure relate to a Safe Torque Off (STO) circuit and a method for the STO circuit. The STO circuit has an input suitable for receiving an input signal, channels coupled to the input in parallel, wherein each of the channels includes a switch, a level conversion circuit, and an isolation circuit connected in series. Each isolation circuit being configured to be turned on when the respective switch is closed and to be turned off when the respective switch is opened. Each of the channels also includes an inverter module, a control unit, a first switch unit, and a second switch unit.

Abstract: In a method for operating a controllable converter with an intermediate circuit capacitor, the control behavior can be improved by transmitting, depending on an intermediate circuit voltage applied to the intermediate circuit capacitor, an additional power component via the controllable converter such that the electric current that is generated by the controllable converter for the additional power component counteracts an oscillation of the intermediate circuit voltage. The additional power component is transmitted by the controllable converter to a connected motor as a pulsating additional torque. Also described is a controllable converter with a control unit for carrying out a method, wherein the controllable converter has semiconductors that can be switched off, and an intermediate circuit capacitor designed as a film-type capacitor.

Abstract: A control system configured to control a transistor configured to control energy delivery to a load. The control system comprises a system controller to sense an event in the control system and to assert a command signal in response to the sensed event and a switch controller configured to receive the command signal. The switch controller is configured to control the turn on and the turn off of the transistor, wherein the system controller controls the turn on or the turn off, or control both the turn on and the turn off of the transistor with a first drive strength in response to a first command in the command signal and controls the turn on or the turn off, or control both the turn on and the turn off of the transistor with a second drive strength in response to a second command in the command signal.

Abstract: The invention relates to a method for controlling a three-phase inverter (3) using a 120° control arrangement associated with a PWM-type control, the inverter (3) being driven by a controller and configured to power a permanent-magnet synchronous motor (5) of a device on board an aircraft. The motor (5) comprises a stator and a rotor that can be rotated relative to the stator when the motor (5) is powered. The inverter (3) comprises three branches (31, 32, 33), each branch comprising two switches (310, 311, 320, 321 and 330, 331) associated with a motor winding sing a 120° control arrangement of a three-phase inverter. The method is characterised in that when one switch on one branch is controlled such as to switch front the on-state to the off-state, the other switch on said branch is controlled such as to be in the on-state for a sufficient amount of time to allow the magnetic discharge of the motor winding associated with said branch.

Abstract: A motor driving device controls a three-phase motor and a single-phase motor to operate in parallel. The motor driving device includes a dc terminal in which an upper and a lower DC-link capacitor are located. The motor driving device also includes a neutral terminal disposed between the upper and lower DC-link capacitors. The motor driving device includes an inverter that includes three pairs of upper switching elements and lower switching elements. Two pairs of upper switching elements and lower switching elements among three pairs are connected to an a-phase terminal and a b-phase terminal of the three-phase motor, respectively. The other pair of upper switching elements and lower switching elements among three pairs is connected to a first terminal of the single-phase motor. The neutral terminal is connected to a second terminal of the single-phase motor. A c-phase terminal of the three-phase motor is connected to the single-phase motor.

Abstract: A motor system can include a motor, the motor including at least a rotor, and a controller configured to operate the motor. The controller can be configured to perform operations for operating the motor.

Abstract: Technical solutions are described for estimating machine parameters of a permanent magnet synchronous motor (PMSM) drive. An example method includes determining a region for estimating a machine parameter based on a motor velocity value and a motor current value. The method further includes, in response to the motor velocity value and the motor current value being in the region, estimating an error in estimated voltage command, and estimating the machine parameter using the error in estimated voltage command.

Abstract: A battery control apparatus includes: an MCU including a first control terminal, a first sensing terminal connected to a first node, a second control terminal, a third control terminal, a second sensing terminal connected to a second node, and a fourth control terminal; a relay including a switch and a coil connected between the first node and the second node; and a first reduction circuit including a first transistor having a first gate connected to the first control terminal and a first end connected to the first node, and a second transistor having a second gate connected to the second control terminal and the MCU controls the first gate and the second gate to respectively allow the first transistor to be turned on and the second transistor to be turned off when there is no voltage change of the first node.

Abstract: Provided is a motor drive device including a motor having a rotor and a stator, an inverter electrically connected to the motor, and a control device for controlling the inverter. The control device includes: an impedance observer that estimates at least an amount of variation in impedance of the motor on the basis of a voltage command value, a current command value, and an actual current flowing between the inverter and the motor; a comparator that calculates a difference between the current command value and the actual current flowing between the inverter and the motor; and a failure detection unit that outputs a failure flag when the amount of variation in impedance exceeds or falls below a predetermined threshold, or when the difference calculated by the comparator exceeds or falls below a predetermined threshold.

Abstract: A refrigeration system for a temperature-controlled storage device includes a refrigeration circuit, a cooling circuit, and a controller. The refrigeration circuit includes a compressor driven by a brushless DC motor operable at multiple different speeds, a first heat exchanger, an expansion device, and a cooling unit in fluid communication via a first working fluid. The cooling circuit includes a pump and a second heat exchanger in fluid communication with the first heat exchanger via a second working fluid such that the first heat exchanger is liquid-cooled by the second working fluid. The controller operates the brushless DC motor at multiple different speeds to accommodate multiple different thermal loads experienced by the refrigeration system. Each of the speeds corresponds to a different thermal load. The controller modulates the speed of the brushless DC motor to maintain a desired temperature of a temperature-controlled space within the temperature-controlled device.

Abstract: An inverter converts direct-current power to alternating-current power by operations of a plurality of switching elements under a PWM control, and supplies the alternating-current power to an alternating-current electric motor. A feedback control computation unit of an inverter control unit uses current values acquired from current sensors detecting a current flowing to the alternating-current electric motor and a rotation angle of the alternating-current electric motor to perform a control computation in a (N/2) cycle (N is a natural number) of a triangular wave carrier of the PWM control. At the acquisition of the current values detected by the current sensors, an average acquisition unit acquires an average of current values in a carrier half cycle as a period between a peak and a valley of the carrier, or acquires a current value regarded as an average of the current values at an acquirable timing.

Abstract: A 15-level multilevel inverter circuit includes an outer circuit, an inner circuit, a polarity changing circuit and a computing device. The outer circuit and the inner circuit include a plurality of DC voltage supplies. Each DC voltage supply has a positive and a negative terminal. The outer circuit, the inner circuit and the polarity changing circuit include a plurality of unidirectional power switches. Each unidirectional power switch is a transistor with a diode connected in parallel to the transistor. The computing device is configured to provide control signals to the gates of the plurality of the unidirectional power switches of the outer circuit and the inner circuit to add or subtract the voltage of each of inner DC voltage supplies to form square waveforms approximating sinusoidal waveforms, and to the gates of the plurality of the unidirectional power switches of the polarity changing circuit to switch the polarity of the voltage.

Abstract: Switching control of an inverter is performed such that rising and falling of a terminal voltage of U phase including upper and lower arm switching elements are calculated, and the calculated rising of the terminal voltage of U phase and falling of a terminal voltage of V phase or W phase or the calculated falling of the terminal voltage of U phase and rising of the terminal voltage of V phase or W phase are synchronized with each other.

Abstract: The current disclosure provides methods and systems for intelligent load management in off-grid AC systems and provides methods and systems to control and prioritize loads, so that supply and demand can be balanced via an extremely robust and reliable system.

Abstract: A motor driving apparatus for a home appliance includes: a power supply part configured to supply DC power, a DC-Link capacitor connected to the power supply part, an inverter connected to the DC-Link capacitor and comprising a plurality of switching elements, the inverter being configured to convert, by operating the plurality of switching elements, the DC power into AC power and output the converted AC power to a motor, a DC-Link resistor element disposed between the DC-Link capacitor and the inverter, a signal generator connected to the DC-Link resistor element and configured to generate and output a plurality of signals based on an output current flowing through the DC-Link resistor element, and a controller configured to control the inverter based on the plurality of signals received from the signal generator.

Abstract: A charging power supplying system using a motor driving system includes an inverter that is connected to a battery, includes at least one switching device, and is configured to change an on/off state of the switching device and to convert power stored in the battery to output the converted power to an output terminal of the inverter, a motor including a plurality of coils that each receive power provided from the output terminal of the inverter, a charging power output terminal that is connected to a neutral point to which the plurality of coils of the motor is commonly connected and outputs current output from the neutral point to an external charging target, and a controller configured to control the switching device in the inverter based on current of the output terminal of the inverter.

Abstract: For high frequency injection (HFI) transition disturbance elimination, a processor directs an HFI transition for a motor. The processor determines compensation pulse voltages for an HFI compensation pulse. The processor further injects a sum of the HFI compensation pulse and an HFI voltage into a current regulator voltage output signal for a compensation Pulse Width Modulation (PWM) cycle. The HFI compensation pulse settles an HFI current to a steady state.

Abstract: Provided is an AC electric motor control device capable of detecting, in an AC electric motor drive device, abnormal operation of an AC electric motor or abnormal operation due to, for example, a sudden change of a load without an erroneous operation regardless of the operational state of the AC electric motor. When driving a three-phase AC electric motor by an inverter, inside a controller, an electric motor constant is calculated using at least one of the current, voltage, and rotational speed of the electric motor and the variation of the constant value is analyzed, thereby detecting abnormal operation of the electric motor or abnormal operation of a load device connected to the electric motor. In order to analyze the constant, a variation to be determined to be abnormal is preset or an abnormal value is calculated in comparison with the accumulated values of past constant changes. Alternatively, only the variation of the constant calculated in the controller is extracted to detect abnormality.

Abstract: An overcurrent detection reference compensation system of a switching element for an inverter and an overcurrent detection system using the same can correct an overcurrent detection reference used to detect an overcurrent of a switching element according to a temperature of the switching element.

Abstract: A motor control system for selectively controlling power from a power source to a load includes a PCB structure and a power converter affixed to the PCB structure that is operable to provide a controlled output power to the load. The motor control system also includes a standalone protection and control module mounted onto the at least one PCB structure so as to be electrically coupled therewith, the standalone protection and control module further including a front-end switching unit comprising a plurality of switching devices operable to selectively interrupt and control power flow from the power source to the power converter and to a bypass path that bypasses the power converter and a back-end switching unit positioned downstream from the front-end switching unit and comprising a plurality of switching devices operable to selectively interrupt power flow from the power converter and the bypass path to the load.

Abstract: A motor vehicle, particularly a passenger car, contains an onboard electrical system having a number of electrical consumers, a generator and an onboard electrical system rechargeable battery. A bidirectional interface is provided for a rechargeable device battery of a mobile device such that the rechargeable device battery can be coupled to the onboard electrical system by the bidirectional interface and, when coupled, can both be charged by the onboard electrical system and be used as an additional energy source in the onboard electrical system.

Abstract: The invention relates to a method for the closed-loop and open-loop control of two or more EC motors operated using a common converter, wherein for the purpose of setting the operating point of the EC motors, common open-loop or closed-loop control using at least one controller is provided, wherein a combination of at least two control options is provided and in this case a controlled variable regulates the voltage setting at the output of the converter such that the two or more EC motors follow an intended sequence of operating points in a stable manner.

Abstract: An inverter device includes a motor, a power supply that supplies the motor with electric current, an inverter that, during regenerative operation of the motor, performs switching between a first state in which regenerative current generated in the motor is returned to the motor again and a second state in which the regenerative current is supplied to the power supply, a first detector that detects a first condition electrically acting on the inverter, a second detector that detects a second condition electrically acting on the power supply, and a determiner that performs a first determination to perform switching between the first state and the second state, based on a detection result by the first detector or the second detector.

Abstract: The ideal design for a redundant orbitally driven electric ducted fan that can replace a family of current propeller and motor combinations in electric ducted fan designs by meeting air flow and pressure requirements while drawing less electric current to rotate and thus produce the required flow not only would reduce cost of operation over the life of the fan but opens new possibilities for electric powered vertical takeoff and landing vehicles with redundant drives improving safety of operation. The entry of flying machines using propellers and lifting fans such as hover bikes and quadcopters, manned or unmanned is driving a need to re-examine the application of force applied to rotate these fans to achieve a reduction in aircraft weight and increase flying time for a given battery charge or load of fuel.

Abstract: A drive control method and system for controlling an inverter during power disruptions in the operation of an elevator drive includes the steps of predetermining whether a hoist motor of the elevator drive will be operating in a motor mode, a balanced mode or a regenerative mode on commencement of the power disruption, and controlling the inverter in accordance with the predetermined operating mode after commencement of the power disruption.

Abstract: A controller of a motor that drives a driven body includes: an inertia estimating unit that estimates inertia on the basis of feedback information (torque and current) of the motor; a computing unit that computes an acceleration or deceleration time constant of the motor from the estimation inertia estimated by the inertia estimating unit; a storage unit that stores an inertia difference which is a difference between the estimation inertia and at least one known actual inertia and a time constant difference which is a difference between an actual acceleration or deceleration time constant corresponding to the actual inertia and an acceleration or deceleration time constant calculated on the basis of the estimation inertia; and a correction unit that corrects the acceleration or deceleration time constant calculated by the computing unit using the inertia difference and the time constant difference stored in the storage unit.

Abstract: A 15-level multilevel inverter circuit includes an outer circuit, an inner circuit, a polarity changing circuit and a computing device. The outer circuit and the inner circuit include a plurality of DC voltage supplies. Each DC voltage supply has a positive and a negative terminal. The outer circuit, the inner circuit and the polarity changing circuit include a plurality of unidirectional power switches. Each unidirectional power switch is a transistor with a diode connected in parallel to the transistor. The computing device is configured to provide control signals to the gates of the plurality of the unidirectional power switches of the outer circuit and the inner circuit to add or subtract the voltage of each of inner DC voltage supplies to form square waveforms approximating sinusoidal waveforms, and to the gates of the plurality of the unidirectional power switches of the polarity changing circuit to switch the polarity of the voltage.

Abstract: A voltage converter (110, 210) having a first bidirectional voltage line (112, 212), a second bidirectional voltage line (114, 214), a power storage element (L1) arranged between the first bidirectional voltage line and the second bidirectional voltage line, a switch element electronically coupled to the power storage element, a controller (141) for controlling the switch, and the controller configured and arranged to adjust a current flow between the first voltage line and the second voltage line such that a voltage level on the second bidirectional voltage line is substantially maintained at a target DC voltage.

Abstract: Electric drive devices having at least one power electronics module including at least one voltage circuit having power electronics components such as a converter, transformer, frequency inverter, power capacitor, circuit breaker and the like, and at least one fuse for interrupting the voltage circuit in the event of excess currents and/or voltages. The invention also relates to a wind turbine and similar large industrial electrical systems having such a drive device. The device can comprise at least one pyrotechnic fuse with a propellant charge for the irreversible interruption of the voltage circuit, wherein the pyrotechnic fuse is arranged in the voltage circuit of the power electronics module or immediately adjacent to at least one power electronics component such as a converter, frequency inverter, transformer, power capacitor or circuit breaker.

Abstract: Integrated circuitry, such as a microcontroller, for controlling an electric motor includes circuitry for measuring a bi-directional current flowing within a coil of the electric motor. The current is sensed by an externally implemented current sensing element, such as a shunt resistor, to produce a differential voltage that is delivered to input pins of the microcontroller, which are protected by electrostatic discharge protection circuits. Current sources implemented within the microcontroller are coupled to the input pins, and work in concert with external resistors to shift the differential voltage so that it is maintained within an appropriate voltage operating range so that an accurate measurement of the bi-directional current can be made by the microcontroller.

Abstract: An electric tool includes a motor, a drive circuit, a power supply and a controller. The motor includes a rotor and first, second, and third phase windings. The drive circuit is electrically connected to the first, second, and third phase windings and drives the motor to output power. The power supply is electrically connected to the drive circuit and supplies power to the first, second, and third phase windings through the drive circuit. The controller is connected to the drive circuit and outputs a control signal to control the drive circuit. The controller controls the drive circuit according to a rotation position of the rotor when a voltage of the power supply is less than or equal to a preset voltage threshold so that the first, second, and third phase windings are simultaneously connected to the power supply.

Abstract: A system includes a motor operating with an angular velocity and an operational current, a motor controller circuit to issue control signals to the motor, and a stator resistance calculation circuit. The calculation circuit is to introduce a perturbation signal to the motor through the control signals issued by the motor controller circuit, observe operations of the motor in response to the perturbation signal, estimate stator resistance of the motor based upon the observations of the operations of the motor in response to the perturbation signal, adjust operation of the motor based upon a changed stator resistance.

Abstract: A system includes an electronic power converter and a controller. The electronic power converter supplies power to one or more motor drives of an HVAC and/or refrigeration system. The controller obtains a plurality of pulse width modulation (PWM) algorithms. Each PWM algorithm has an associated harmonic signature. The controller further determines one or more resonance frequencies associated with the HVAC and/or refrigeration system. The controller also selects a first PWM algorithm from the plurality of PWM algorithms based at least in part on the harmonic signature associated with the first PWM algorithm mitigating the one or more resonance frequencies associated with the refrigeration system. The controller further operates the electronic power converter according to the first PWM algorithm.

Abstract: An inverter device includes gate driving circuits for upper and lower arms of a bridge circuit, a first power supply supplying a power supply voltage to each driving circuit, and a second power supply having a reference potential different from that of the first power supply. The inverter device also includes a first fail-safe circuit having a reference potential common to the first power supply and generating driving commands with respect to the upper and lower arms, and a second fail-safe circuit having a reference potential common to the second power supply and generating driving commands with respect to the upper or lower arm. The lower arm gate driving circuit has two driving command input functions having different reference potentials, one function inputs the driving commands from the first fail-safe circuit, and the other function inputs the driving commands from the second fail-safe circuit.

Abstract: A single-phase voltage source inverter including a first stage configured to be connectable to a DC source, and a second stage configured to be connectable to an AC load, the first stage including a bridge leg including first and second decoupling switches, the bridge leg connected through an inductor to a decoupling capacitor, where the decoupling capacitor is in series with the DC source when the inverter is connected to the DC source, and the second stage including a bi-directional H-bridge inverter including first, second, third and fourth switches. The decoupling capacitor can be a small film capacitor. The first and second decoupling switches are the only decoupling switches in the bridge leg. The first controller can use pulse width modulation and the second controller uses sinusoidal pulse width modulation. The first controller can use pulse width modulation and the second controller uses pulse energy modulation.

Abstract: The present disclosure may provide a shift range control apparatus that controls on-off operations of switching elements in a driver circuit, drives a motor, and switches a shift range. The shift range control apparatus may be configured to determine an abnormality of a rotation angle sensor detecting a rotation angle of the motor, to control a drive of the motor using a detection value, and to execute a control which switches an energization phase every energization phase switching period without using the detection value of the rotation angle sensor in response to that the rotation angle sensor is abnormal.

Abstract: A power conversion apparatus includes a power converter circuit that outputs an AC power to an electric motor, and circuitry that controls the power converter circuit to add a first change, accompanying a change of a power generated by the electric motor, to a first phase angle, which is a phase angle of a magnetic flux direction of the electric motor corresponding to the AC power, extracts a component generated by the first change from first information indicating the electric power supplied to the electric motor, and estimates the power generated by the electric motor based on the component.

Abstract: A motor system provided with one motor, two batteries, and two inverters further includes a charger which is connected to a first battery and supplies external power; and a control unit which controls drive of the first inverter and the second inverter to drive the motor. When the second battery is charged with the external power, the control unit drives the first inverter and the second inverter to allow power from the first inverter to be transmitted to the second battery through the motor and the second inverter while the motor is in a stationary state.

Abstract: A motor driving circuit including a first and a second driving signal output circuit is configured to selectively output a six-step square wave driving signal from the first driving signal output circuit, or a space-vector driving signal from the second driving signal output circuit to an inverter to drive a motor according to whether an operating power exceeds a power threshold. The first driving signal output circuit is configured to generate the six-step square wave driving signal. The second driving signal output circuit is configured to generate the space-vector driving signal.