A control system for a motor includes: a first processing circuit configured to operate a first drive circuit; a second processing circuit configured to operate a second drive circuit; and a command circuit configured to output a signal relating to a command value for a steered angle of a steered wheel to the first processing circuit and the second processing circuit. The command circuit is configured to execute a detection process, a first notification process, and a second notification process. The first processing circuit is configured to execute a first correction process based on a first result signal to control the steered angle to the command value. The second processing circuit is configured to execute a second correction process based on a second result signal to control the steered angle to the command value.

A circuit for converting single phase power to three phase power and method of operation that automatically starts upon detection of a demand for three phase power from a three phase load connected to the circuit.

A circuit for converting single phase power to three phase power and method of operation that automatically starts upon detection of a demand for three phase power from a three phase load connected to the circuit.

This invention proposes a method to regulate high efficiency region of permanent magnet motor. The internal relationship between the point with maximum efficiency and the points around it is firstly revealed. Then, the optimal combination of copper loss, iron loss and permanent magnet eddy-current loss is presented when maximum efficiency point moves toward different directions. Hence, the method for regulating high efficiency region can be obtained. This method can be suitable for any type of permanent magnet motors, which can adjust high efficiency region to the dense working point area of the motor under different operating conditions according to design requirements. If this method is used into electric vehicle, it can combine the high efficiency region with the electric vehicle driving cycle to reduce energy consumption and enhance the life mileage of electric vehicle effectively.

A spacing-assured gas discharge tube assembly is installed on a printed circuit board, which may be part of a motor controller. The discharge tube assembly includes a tube body and an electrostatic spacing shield disposed at least partially around the tube body. The shield is configured to prevent close physical proximity of adjacent structures having electrostatic fields that may alter the breakdown voltage of the tube body.

A circuit arrangement (10) for controlling a stator winding (11) of a stator (12) of an electric machine (13) is provided. The stator winding (11) has at least four electrical phases (), which are designed to be supplied with a separate phase current (I.sub.n), respectively. A modulation signal (M) is assigned to each electrical phase () and the modulation signals (M) are out of phase with respect to one another so that the stator winding (11) is designed to generate a rotary field. At least two carrier signals (T) are provided for generating the phase currents (I.sub.n), and the electrical phases () are divided into at least two groups, each of which is assigned a carrier signal (T). The carrier signals (T) have a phase shift () relative to one another. Furthermore, an electric machine (13) comprising a circuit arrangement (10) is provided.

A circuit arrangement (10) for controlling a stator winding (11) of a stator (12) of an electric machine (13) is provided. The stator winding (11) has at least four electrical phases (), which are designed to be supplied with a separate phase current (I.sub.n), respectively. A modulation signal (M) is assigned to each electrical phase () and the modulation signals (M) are out of phase with respect to one another so that the stator winding (11) is designed to generate a rotary field. At least two carrier signals (T) are provided for generating the phase currents (I.sub.n), and the electrical phases () are divided into at least two groups, each of which is assigned a carrier signal (T). The carrier signals (T) have a phase shift () relative to one another. Furthermore, an electric machine (13) comprising a circuit arrangement (10) is provided.

An apparatus for controlling an inverter driving a motor is provided. The apparatus includes a current controller that generates a voltage instruction for causing a current detection value, obtained by measuring a current provided from an inverter to a motor, to correspond to a current instruction for driving the motor. A voltage modulator generates a pulse width modulation signal for controlling on/off states of switching devices in the inverter at a predetermined switching frequency based on the voltage instruction. A frequency determiner determines the switching frequency based on driving information of the motor, determines a plurality of synchronization frequencies based on a speed of the motor, and randomly selects and determines one of the plurality of synchronization frequencies as the switching frequency.

A system is provided for driving a load such as a multi-phase motor. The system includes a motor driver that has a plurality of switches coupled to a motor to drive a current through each of a plurality of phase coils of the motor. A polarity detection circuit detects a polarity of the current in one or more of the phase coils of the motor to generate a polarity value that represents the detected current polarity. The polarity detection circuit can include at least one comparator that has a first input coupled to a node between two of the plurality of switches, a second input coupled to receive a threshold value, and an output from which the polarity value is provided. Further included is a controller that is configured to provide a plurality of pulse width modulated (PWM) output control signals to the plurality of switches to control the switches to drive the current through the plurality of phase coils of the motor. In response to the polarity value, the controller is configured to alter a duty cycle of the plurality of PWM output control signals to modify a voltage applied to the plurality of phase coils of the motor.

A controller, responsive to a signal indicating deactivation of a vehicle and disconnection of a traction battery from an inverter, generates a d-axis current command for the inverter having a ramp portion that defines a rate of change in current magnitude that depends on an electric angle between a rotor and stator of an electric machine.