Abstract: A method of synchronizing a cross-compound generator system on one or more turning gears during startup includes determining, via a notch monitor controller, first and second angular velocities, respectively, of a first and a second rotor. The method also includes simultaneously exciting, via the notch monitor controller, the first and second rotors to attain electromechanical coupling therebetween. The method further includes determining, via the notch monitor controller, a value of a time at which a calibration value of an offset is a constant value, where the offset is representative of a phase alignment of the first rotor relative to the second rotor, and where the offset is indicative of a successful electromechanical coupling therebetween. The method also includes disengaging the one or more turning gears from the cross-compound generator system.

Abstract: The invention relates to an inverter for controlling an electric machine on a voltage source having a first and a second potential. The inverter comprises a plurality of bridge circuits which each comprise a first flow control valve, a second flow control valve and a connector for the electric machine, and a first interface for receiving individual control signals for the flow control valves and a second interface for detecting a switch-off signal. Each first flow control valve is configured to control current between the high electrical potential and the associated connector, and each second flow control valve is configured to control current between the associated connector and the low electrical potential. A switch-off device is configured to close either all first or all second flow control valves as a function of the shut-off signal and independently of signals on the first interface.

Abstract: A protection device provided between a synchronous motor having a plurality of windings and a motor driving device for driving the synchronous motor includes: a switching unit for making and breaking the connection between the motor driving device and the synchronous motor; a dynamic brake circuit including resistors and switches, to short-circuit the plurality of windings between the switching unit and the synchronous motor via the resistors; and a control device for controlling the switching unit and the dynamic brake circuit. The control device controls the switches in the dynamic brake circuit to short-circuit the plurality of windings, and then controls the switching unit to cut off the connection between the motor driving device and the synchronous motor.

Abstract: The present application provides a control method, an apparatus, a power system, and an electric vehicle, relating to the field of electric vehicles. The method includes: obtaining a battery cell temperature of a power battery, and sending a first control signal to an inverter when the battery cell temperature meets a preset power battery heating condition, where the first control signal is configured to control the inverter to convert a current provided by the power battery into an alternating current with a randomly changing frequency, and the alternating current with a randomly changing frequency is configured to supply power to a permanent magnet motor. New frequency components may be introduced to evenly distribute originally concentrated radial electromagnetic forces to an entire stator, thereby reducing vibration noises during the heating process of the power battery.

Abstract: A steering controller includes processing circuitry. The processing circuitry is configured to execute an operation process for calculating a torque command value corresponding to a sum of an amount by which the steering-side operation amount is converted into the torque required for the electric motor and an amount by which the steerable wheel-side operation amount is converted into the torque required for the electric motor and operate a drive circuit of the electric motor to adjust the torque of the electric motor to the torque command value.

Abstract: An estimating method includes the following steps. Firstly, if the electrical machine control system is in the generator mode, a bus voltage of the bus capacitor is monitored continuously. Then, if the switch is turned to an on state, a first current value of a current flowing through the bus capacitor during an off state of the switch is calculated. Then, the switch is turned to the on state. Then, if the switch is turned to the off state, a second current value of a current flowing through the bus capacitor during the on state of the switch is calculated, and a resistance value of the braking resistor is estimated according to the first current value and the second current value.

Abstract: An actuator (1) comprises an electric motor (11) for moving an actuated part (2) to an actuated position. The actuator (1) further comprises a controller (10) connected to the electric motor (11) and configured to determine a motor current of the electric motor (11) and to detect motor rotations. The controller (10) is further configured to determine the actuated position by counting the motor rotations detected while the motor current is at or above a current threshold indicative of a load torque, and by not counting motor rotations detected while the motor current is below said current threshold.

Abstract: A switching device for switching an electric motor, where the switching device is arranged on a component which is driven in rotation by the motor. The switching device is characterized in that a contactless, absolute position-measuring device, an evaluation unit for evaluating position signals and an output unit for outputting switching information for indirectly switching and/or directly switching the motor current as a function of a position signal are provided within a single housing.

Abstract: A device for speed-dependent braking torque control for electrical machines excited by permanent magnets includes a switching device deliberately short-circuits the electrical machine. The switching device is controlled as a function of an induced voltage generated by the electrical machine. If the induced voltage falls below a defined value, the switching device reverses the short-circuited state of the electrical machine to cause the braking torque to reduce to zero and the speed to increase again. The speed can thus be controlled within a range by alternately opening and closing the switching device.

Abstract: Provided is a power conversion controller in which variation in reactive power among power conversion controllers can be inhibited while maintaining the running performance of vehicles. The power conversion controller includes a power factor setter that sets a power factor based on a detection value of an overhead line voltage, and a calculator that calculates a reactive current command value by multiplying an active current command value by a tangent of a power factor angle of the power factor. The power factor setter sets a reference value set in advance as the power factor if the detection value is within a reference range, sets a value smaller than the reference value as the power factor if the detection value is below the reference range, and sets a value larger than the reference value as the power factor if the detection value is beyond the reference range.

Abstract: A signal processor is configured to perform a process equivalent to performing a series of fixed-to-rotating coordinate conversion, a predetermined process and then rotating-to-fixed coordinate conversion, while maintaining linearity and time-invariance. The signal processor performs a process given by the following matrix G: G = [ F ? ( s + j ? ? ? 0 ) + F ? ( s - j ? ? ? 0 ) 2 F ? ( s + j ? ? ? 0 ) - F ? ( s - j ? ? ? 0 ) 2 ? j - F ? ( s + j ? ? ? 0 ) - F ? ( s - j ? ? ? 0 ) 2 ? j F ? ( s + j ? ? ? 0 ) + F ? ( s - j ? ? ? 0 ) 2 ] where F(s) is a transfer function representing the predetermined process, ?0 is a predetermined angular frequency and j is the imaginary unit.

Abstract: Provided is a vehicle door opening/closing device. Given that a door is in an initial fully-open position, a storage unit stores: a target speed map for defining a relation between the door position and the target speed of a motor; and information indicative of an arbitrary fully open position set by a user. A map speed computation unit calculates a map speed based on the target speed map, whereas a gradually decreasing speed calculation unit calculates a gradually decreasing target speed for decreasing at a prescribed deceleration rate as the arbitrary fully open position gets closer so that a prescribed terminal speed is reached at the arbitrary fully open position. A speed sequence control unit switches a set target speed to the gradually decreasing target speed from the map speed at a door position where the gradually decreasing target speed becomes slower than the map speed.

Abstract: A window regulator system for a window coupled to a door and movable between fully open and closed positions and a short drop position and method of operation are disclosed. The system includes rails with window regulator lifter plate assemblies being moveable along the rails by cables. A motor winds the cables to move the window. An electronic control unit detects operation of at least one of a door handle and a latch of the door to identify a short drop request corresponding to the door shut or opened. The electronic control unit ensures that no freeplay exists in the window regulator system to provide accurate movement of the window and controls the motor to selectively raise the window to the fully closed position in response to the door being shut and temporarily lower the window to the short drop position in response to identifying the short drop request.

Abstract: A motor includes: a stator having an annular stator core and multiple teeth protruding radially inwards from the stator core; a coil wound around the teeth; a shaft rotating around the rotation axis radially inside of the stator core; a rotor core fixed to the shaft; magnets positioned on the outer peripheral surface of the rotor core; a salient pole positioned between magnets adjacent to each other in the circumferential direction; an applying portion applying a voltage to the coil; and an applying control portion controlling the applying portion. The ratio of the number of magnetic poles of the magnets and the number of teeth is 2:3. The voltage is a rectangular wave, and its application is started when the tip of the salient pole does not face an opening in the teeth.

Abstract: An electrical combination, a tool system, an electric motor, a battery pack, and operating and manufacturing methods. The tool may include a tool housing, a motor supported by the tool housing, the motor having a nominal outer diameter of up to about 80 millimeters (mm), the motor being operable to output at least about 2760 watts (W), and a tool terminal electrically connected to the motor; a battery pack including a pack housing defining a volume of the battery pack, the volume being up to about 5.2×106 cubic millimeters (mm3), battery cells supported by the pack housing, the battery cells being electrically connected and having a nominal voltage of up to about 80 volts (V), and a pack terminal electrically connectable to the tool terminal to transfer current between the battery pack and the tool; and a controller operable to control the transfer of current.

Abstract: The invention comprises an inverter/converter yielding high frequency harmonics and/or non-sixty Hertz output coupled to a high frequency inductor-capacitor filter apparatus. For example, an inverter/converter apparatus is provided that uses a silicon carbide transistor to output power having a carrier frequency modulated by a fundamental frequency and a set of harmonic frequencies, where the minimum carrier frequency is above that usable by an iron-steel inductor, such as greater than ten kiloHertz at fifty or more amperes. An inductor-capacitor filter, comprising an inductor having a distributed gap core material, receives power output from the inverter/converter and processes the power by passing the fundamental frequency while reducing amplitude of the harmonic frequencies.

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 method of controlling the commutation of a brushless direct current motor includes providing sensors which provide a variable output dependent on rotational angle or the relative position of the stator and rotor of the motor. Output from the sensors is sampled at a time between a past commutation event and the next commutation event to be implemented. An angular position between the rotor and stator is determined at the time. The time of the next commutation event is determined based on the next commutation angle, motor speed, and the determined angular position.

Abstract: The present invention quickly stops rotation of an electric compressor while preventing damage to switching elements. An electric compressor 1 comprises a motor drive circuit 52 having multiple switching elements IGBT Q1 to Q6, a control unit 53 that controls driving of the multiple switching elements IGBT Q1 to Q6 and drives a motor 4, and a current detection unit 54 that detects a current flowing through the motor drive circuit 52. The control unit 53 performs stop control that stops rotation of the compression mechanism 3 by performing braking control that controls drive of predetermined switching elements IGBT (Q2, Q4, Q6 and the like) among the multiple switching elements IGBT Q1 to Q6.

Abstract: An electrical machine includes a with a parallel first and second phase windings. A first neutral bus is connected to the first phase winding and a second neutral bus is connected to the second phase winding. A first voltage sensor is coupled to the first neutral bus and a second voltage sensor coupled to the second phase winding for monitoring current imbalance between the first and second phase windings.