A closed-loop circuit is detected based on a short-circuit failure of a motor control switching element of a motor drive circuit and a cutoff switching element. A motor control device including a motor, a motor drive circuit (10a) that is connected to a power supply device and the motor and controls the output of the motor, and a processing unit for detecting a closed-loop circuit formed by the motor and the motor drive circuit (10a) based on a short-circuit failure of switching elements arranged in the motor drive circuit (10a).

A controller for an electric motor includes a protective circuit for limiting current or for polarity reversal protection, the protective circuit including a field effect transistor having a gate. The protective circuit further includes a control unit for providing a control voltage for the gate, a smoothing capacitor for charge storage being provided at the gate.

A controller for an electric motor includes a protective circuit for limiting current or for polarity reversal protection, the protective circuit including a field effect transistor having a gate. The protective circuit further includes a control unit for providing a control voltage for the gate, a smoothing capacitor for charge storage being provided at the gate.

The present invention relates broadly to commutation control of a BLDC motor for use with, for example, a power tool. The method uses a controller to control a BLDC motor in the event of a position sensor failure. Rather than ceasing operation of the motor and indicating a fault or error message to the user, the present invention determines when the next transition should occur based on the time between past hall transitions using a timer. Thus, if one or two position sensors are no longer providing position information to the controller, the controller can determine when the transitions would be changing based on past transitions to continue controlling the motor and prevents the motor from ceasing operation.

A motor control system comprises: a motor; power sources; electric control units (ECUs) connected with the motor, each of ECUs comprising an inverter connected with a respective power source; and a controller monitoring whether an abnormality is detected in a voltage supplied to ECU(s). When the abnormality is detected in the voltage supplied to non-active ECU, the controller isolates current of active ECU to an inverter of active ECU to prevent high voltage spike caused by uncontrolled current flowing from active ECU to non-active ECU having the abnormality, and after the current of active ECU is isolated, electrically disconnects non-active ECU from active ECU and/or the motor. When the abnormality is detected in the voltage supplied to active ECU, the controller electrically disconnects active ECU from non-active ECU and/or the motor; and after active ECU having the abnormality is disconnected from non-active ECU and/or the motor, activates non-active ECU.

A motor control system comprises: a motor; power sources; electric control units (ECUs) connected with the motor, each of ECUs comprising an inverter connected with a respective power source; and a controller monitoring whether an abnormality is detected in a voltage supplied to ECU(s). When the abnormality is detected in the voltage supplied to non-active ECU, the controller isolates current of active ECU to an inverter of active ECU to prevent high voltage spike caused by uncontrolled current flowing from active ECU to non-active ECU having the abnormality, and after the current of active ECU is isolated, electrically disconnects non-active ECU from active ECU and/or the motor. When the abnormality is detected in the voltage supplied to active ECU, the controller electrically disconnects active ECU from non-active ECU and/or the motor; and after active ECU having the abnormality is disconnected from non-active ECU and/or the motor, activates non-active ECU.

A control apparatus for a rotary electric machine extracts, based on a rotational speed of a rotating member, a vibration component included in the rotational speed of the rotating member, the vibration component being based on vibrations of a drivetrain. The control apparatus calculates, according to the extracted vibration component, compensation torque for compensating the vibrations of the drivetrain. The control apparatus performs drive control of the rotary electric machine according to the compensation torque. The control apparatus performs suppression to suppress the rotational speed of the rotating member from changing due to change of a speed change ratio.

A control apparatus for a rotary electric machine extracts, based on a rotational speed of a rotating member, a vibration component included in the rotational speed of the rotating member, the vibration component being based on vibrations of a drivetrain. The control apparatus calculates, according to the extracted vibration component, compensation torque for compensating the vibrations of the drivetrain. The control apparatus performs drive control of the rotary electric machine according to the compensation torque. The control apparatus performs suppression to suppress the rotational speed of the rotating member from changing due to change of a speed change ratio.

The present invention discloses an intelligent power control system for driving UAV motors comprising: a motor temperature reading unit, a processing unit and a motor power output controlling unit. The motor-temperature reading unit may be configured for reading a temperature of at least one motor mounted in the UAV. The processing unit may be configured for comparing whether the read temperature exceeds a first particular temperature, and controlling the motor power output controlling unit to adjust dynamically allowed maximum output power of various motors according to a comparison result. The present invention is also related to an intelligent power control system for driving UAV motors, and a UAV utilizing the intelligent power control system for driving UAV motors.

The present invention discloses an intelligent power control system for driving UAV motors comprising: a motor temperature reading unit, a processing unit and a motor power output controlling unit. The motor-temperature reading unit may be configured for reading a temperature of at least one motor mounted in the UAV. The processing unit may be configured for comparing whether the read temperature exceeds a first particular temperature, and controlling the motor power output controlling unit to adjust dynamically allowed maximum output power of various motors according to a comparison result. The present invention is also related to an intelligent power control system for driving UAV motors, and a UAV utilizing the intelligent power control system for driving UAV motors.