Abstract: The device for braking an electric motor comprises a rotor provided with two brushes and a stator comprising at least two half-coils connected in series to the brushes while the motor is nominally activated. Said device comprises a means for underpowering, the motor, a means for connecting in series a single half-coil to the rotor brushes and a means for controlling the braking by underpowering the motor until at least one value of a physical quantity reaches a predetermined value and the single half-coil is connected in series to the rotor brushes when the value of a physical quantity reaches the predetermined value.

Abstract: The present application relates to a method, circuit, and motor driving system for adaptively adjusting a PWM duty cycle, comprising: sampling a direct current bus voltage and performing a low-pass filtering; determining whether the direct current bus voltage is under-voltage; if yes, entering an under-voltage protection state; and if not, executing the next step; calculating a new duty cycle and a new amplitude; determining whether the new duty cycle is greater than 100%; if yes, applying a weak magnetic control; and if not, adjusting a duty cycle of PWM signals through the new amplitude. Without altering the core current loop, torque loop, or speed loop of the motor driving system, this application adaptively adjusts the PWM duty cycle based on existing sine wave generators and PWM generators, effectively mitigating the impact of direct current bus voltage fluctuations on motor performance, ensuring straightforward operation, and significantly reducing costs.

Abstract: The electronic parking brake system according to an exemplary embodiment of the present disclosure includes a first ECU (electronic control unit) and a second ECU respectively connected to a plurality of motors for providing a driving force to a wheel to control the plurality of motors, wherein the second ECU includes a power reserve system for storing power supplied from a battery; a switch for switching to connect the plurality of motors to the first ECU or the second ECU based on the operating state of the first ECU; and a second MCU for identifying an operating state of the first ECU, controlling the switch to connect the plurality of motors from the first ECU to the second ECU based on the operating state being an inactive state, and controlling the plurality of motors through the power stored in the power reserve system.

Abstract: A motor controller comprises a switch circuit, a control unit, and a pulse width modulation signal, where the pulse width modulation signal has a duty cycle. The motor controller is used for driving a motor, where the motor has a coil. The switch circuit is configured to supply a coil current to the coil. The control unit is configured to generate a plurality of control signals to control the switch circuit. When the motor controller enters an early alignment state, the motor controller enables the coil current to achieve a predetermined value within one electric period. When the coil current achieves the predetermined value, the control unit records the duty cycle. The motor controller is configured to increase a success rate of starting the motor.

Abstract: A current control method and a motor control circuit are provided. The motor control circuit includes a first rectification circuit and a second rectification circuit connected in parallel between a live wire and a natural wire of a power supply, a sampling resistor, and a controller connected to the second rectification circuit. The first rectification circuit is connected to the motor. The current control method include obtaining a periodic waveform signal of a bus voltage; collecting a bus current value through the sampling resistor; sampling the periodic waveform signal for a plurality of times; linearly fitting multiple voltage values obtained at a plurality of sampling time points to obtain multiple slopes; obtaining a power frequency according to the multiple slopes; calculating a compensation current value according to the power frequency; and generating a control signal according to the compensation current value and the bus current value.

Abstract: A hybrid propulsion unit for an aircraft with multi-rotor rotary wings includes an electrical generator driven by an internal combustion engine, a rectifier configured to convert an AC current sent by the electrical generator into DC current, a DC-AC converter, an electrical network connecting the rectifier to the converter and including a high-voltage DC current bus, electric motors powered by propeller converters coupled to the electric motors, electrical energy storage connected to the electrical network, the electrical storage including at least one primary storage element and at least one secondary storage element.

Abstract: A system includes a battery configured for providing electrical energy in direct current and a drive unit configured for utilizing electrical energy in alternating current to provide an output torque. The system includes a power inverter configured for receiving the electrical energy in direct current, transforming the electrical energy to alternating current, and providing the electrical energy in alternating current to the drive unit. The power inverter includes a direct current bus bar. The system includes a computerized controller. The controller monitors an environmental temperature of the inverter and monitors a current flow of the electrical energy received by the inverter. The controller determines an estimated temperature of the bus bar based upon the environmental temperature and the current flow and determining an inverter percent available capability based upon the estimated temperature.

Abstract: A primary-side inverter is connected to three output terminals of six output terminals included in a motor with an open winding structure including windings of three independent phases and a secondary-side inverter is connected to the remaining three output terminals. Direct current power is supplied to the inverters, and a control device performs PWM control on the inverters by using a switching pattern in which the numbers of phases where each is turned on are equal, and in the switching pattern, ON of only an upper is continued in one phase from among the three phase outputs, OFF of only a lower is continued in another phase, and the upper and lower are alternately turned on and off such that mutual phases are opposite in the remaining one phase in one cycle of an electric angle of the motor over a plural carrier cycles in PWM control.

Abstract: An induction motor assembly includes an induction motor, and one or more switches coupled to selectively inhibit the supply of power from a power source to at least one of a main winding and an auxiliary winding of the motor. A control circuit is configured to obtain a main winding voltage value representative of a voltage across the main winding, receive an auxiliary winding voltage value according to a sensed voltage across the auxiliary winding, and determine at least one of a rotational speed of the induction motor and a load of the induction motor, according to the main winding voltage value and the auxiliary winding voltage value. The control circuit is configured to control switching operation of the one or more switches according to the determined rotational speed or the determined load, or generate a log of the determined rotational speed or the determined load in memory for monitoring.

Abstract: The present invention provides a vehicle control method for controlling a capacitance ripple and a torque ripple of a vehicle drive system, wherein the vehicle drive system comprises a first DC-DC convertor. The vehicle control method comprises utilizing a first three-phase inverter circuit of a motor control device of the vehicle drive system as a first switching circuit of the first DC-DC convertor; utilizing a first three-phase winding of a motor of the vehicle drive system as a first three-phase inductor of the first DC-DC convertor; utilizing a pulse width modulation controller of the vehicle drive system for modulating a first three-phase current outputted by the first switching circuit to generate a first three-phase carrier wave; and setting a first phase difference of each phase of the first three-phase carrier wave for controlling the capacitance ripple and the torque ripple.

Abstract: On a lower side of a floor (2), a battery storage section (31) is formed on a front side of a cross member (27) that connects left and right side members (3l, 3r) to dispose a driving battery (34), a tank storage section (30) is formed on a rear side to dispose a fuel tank (32) and a driving motor (9) is disposed on a rear side of the tank storage section (30). A power cable (26) from a terminal block (34a) of the driving battery (34) is routed and fixed as appropriate so as to bypass the fuel tank (32) via the left side of the fuel tank (32) in the tank storage section (30) and connected to the driving motor (9) via a junction box (21). In an extra length routing area (37) on a side wall (27a) of the cross member (27), an extra length area (26a) is formed by slackening the power cable (26) in a semicircular shape.

Abstract: The present disclosure relates to a dead-time compensation method and apparatus for a permanent magnet synchronous motor (PMSM), a device, and a storage medium. The method includes: acquiring current sampling time d-axis currents and current sampling time q-axis currents corresponding to current sampling time three-phase stator currents of the PMSM; acquiring, according to vector angles of current sampling time three-phase current vectors, current sampling time filtered d-axis currents, and current sampling time filtered q-axis currents, included angles between the current sampling time three-phase current vectors and the d-axis, and acquiring current sampling time angles ? of the current sampling time three-phase current vectors; acquiring polarities of the current sampling time three-phase stator currents according to the current sampling time angles ?; and acquiring current sampling time compensation voltage values according to the polarities of the current sampling time three-phase stator currents.

Abstract: A rotary electric machine control apparatus is provided which controls energization of a rotary electric machine having a plurality of winding sets. The apparatus includes an energization control circuit that is provided for each of the winding sets and has a switching element related to switching of energization to the winding set, a driver circuit that outputs a drive signal to the switching element through a signal line connected to the switching element, and a protection element that is connected to the signal line and in parallel with the switching element. When combinations of the winding sets and electronic components including the energization control circuit provided for each of the winding sets are regarded as systems, in at least one of the systems, performance of the protection element is differentiated from that in the other system to make noise resistance different from noise resistance in the other system.

Abstract: A method for controlling a direct drive system, including: S1: outputting, by the actuator, a current to the winding of the stator corresponding to the actuator to cause the windings to drive the mover corresponding to the windings to move in a single direction along the guide rail; S2: sensing a position of the second position feedback means through the first position feedback means, and acquiring position information of the mover relative to the stator; and S3: changing a drive mode of the actuator according to the position information, so that the actuator adjusts, according to the drive mode, magnitude of the current outputted to the windings of the stator corresponding to the actuator. The above solution can reduce a number of power modules used in the direct drive system, so as to reduce overall manufacturing and use costs of the direct drive system.

Abstract: A propulsion channel for aircraft at least one first dual-fed polyphase asynchronous rotating electric machine configured to be mechanically coupled to a turbine engine. The propulsion channel further includes at least one second polyphase rotating electric machine electrically coupled to the first asynchronous rotating electric machine, and a control and storage module configured to control the first polyphase asynchronous rotating electric machine. The module is connected to the first dual-feed polyphase asynchronous rotating electric machine as well as to the at least second polyphase rotating electric machine. The at least second polyphase rotating electric machine includes a polyphase synchronous rotating electric machine with permanent magnet.

Abstract: A control device controls a multi-phase rotating machine having two multi-phase winding sets of two systems and outputting a torque to a common output shaft. The control device includes: two electric power converters individually connected to two power supplies and supplying an AC electric power to the multi-phase winding sets; and a control unit. The power supplies includes a charge side power supply and a discharge side power supply. The control unit energizes a charge side system and a discharge side system with reciprocal currents, and executes a charge operation from the discharge side power supply to the charge side power supply via the multi-phase rotating machine.

Abstract: A battery-operated device including a rechargeable battery and an interchangeable drive unit that is supplied with power by the rechargeable battery via an electromechanical interface is provided. The rechargeable battery is chargeable via the electromechanical interface.

Abstract: In order to improve a method for selecting a frequency converter for a refrigerant compressor unit comprising a refrigerant compressor and an electric drive motor in such a way that the frequency converter is optimised for the application in question, it is proposed that a working state suitable for the operation of the refrigerant compressor unit is selected in an application field of an application diagram of the refrigerant compressor, that an operating frequency is selected for this selected working state, and that, on the basis of drive data, a working state operating current value corresponding to the selected working state and the selected operating frequency is ascertained for the operation of the refrigerant compressor unit.

Abstract: An object is to achieve overheat protection for a converter and stable voltage output thereof. This power supply device includes: a converter connected to power supply voltage and having a plurality of switching elements; a temperature detection circuit for detecting a temperature of the converter; an inverter which is connected between the converter and a load, and which converts output voltage of the converter and outputs resultant voltage to the load; and a control unit for controlling the switching elements of the converter. When the temperature detected by the temperature detection circuit has exceeded a first limitation value, the control unit controls the switching elements so that the output voltage of the converter becomes the power supply voltage at a set change rate.

Abstract: A controller for an electric motor comprises: an estimator configured to estimate a position of a rotor by using a d-axis current, a q-axis current, a d-axis voltage command value, and a q-axis voltage command value from which a noise is removed by a filter having a first time constant when a torque command value is equal to or greater than zero, and estimate a rotational speed of the electric motor and the position by using the d-axis current, the q-axis current, the d-axis voltage command value, and the q-axis voltage command value from which a noise is removed by a filter having a second time constant smaller than the first time constant when the torque command value is less than zero.