A method is described for controlling an electric motor having a rotor. The method is carried out after a shutdown of the motor has been initiated. The method includes starting a timer in a motor controller, performing regenerative braking to recapture kinetic energy from the rotor as electrical energy, and using the recaptured electrical energy from the regenerative braking to power the motor controller. If the timer in the motor controller exceeds a predetermined timer value, a flag is set in memory in the motor controller to indicate that the motor has stopped.

A supercharging system includes a supercharger including a motor generator, and an intake-side variable cam phase mechanism variably setting a valve-closing timing (IVC angle) of an intake valve. If an operation state of the engine is within a regenerative operation region, a turbine rotation speed controller controls a turbine rotation speed to a target turbine rotation speed set to optimize turbine efficiency by controlling an opening degree of a wastegate valve toward a closing side and by adjusting an amount of power generated by the motor generator. If the operation state is within the regenerative operation region and within a supercharging operation region, a torque controller controls a generated torque to a requested torque by performing cooperative control of an opening degree of an intake bypass valve, the IVC angle and an opening degree of an intake throttle valve.

A vehicle power source includes a generator motor coupled to an engine, a first power storage, a second power storage, a conduction switch, and a switch controller. The first and the second power storages are coupled, in parallel, to the generator motor. The conduction switch is subject to change between a conductive state and a cut-off state of the generator motor and the second power storage. The switch controller changes the conduction switch from the conductive state to the cut-off state, on a condition that the generator motor is controlled in a powered state. The switch controller changes the conduction switch from the cut-off state to the conductive state, on a condition that the second power storage discharges in excess of a threshold, with the conductive switch changed to the cut-off state.

A vehicle power source includes a generator motor coupled to an engine, a first power storage, a second power storage, a conduction switch, and a switch controller. The first and the second power storages are coupled, in parallel, to the generator motor. The conduction switch is subject to change between a conductive state and a cut-off state of the generator motor and the second power storage. The switch controller changes the conduction switch from the conductive state to the cut-off state, on a condition that the generator motor is controlled in a powered state. The switch controller changes the conduction switch from the cut-off state to the conductive state, on a condition that the second power storage discharges in excess of a threshold, with the conductive switch changed to the cut-off state.

A technique controls regenerative braking to reduce skidding of a vehicle. Such a technique involves imparting rotation to an alternating current (AC) electric motor to move the vehicle to a first commanded vehicle speed; applying a regenerative braking power to the AC electric motor to bring the vehicle to a second commanded vehicle speed; while applying the regenerative braking power, adjusting the level of regenerative braking power applied to follow a predetermined speed reduction rate; while adjusting the level of regenerative braking power applied, provide a limit to the maximum level of regenerative braking power available; and while providing the limit to the maximum level of regenerative braking power available, adjusting the limit to the maximum level of regenerative braking power available based on a current speed of the vehicle.

A method of recycling motor power of a movable object is provided to recycle and redistribute power from at least one motor in a decelerating state. The method comprises determining whether an operating state of at least one motor of the movable object is a decelerating state, and recycling power from the at least one motor having a decelerating state. The method also comprises redistributing the recycled power to other power consuming components of the movable object. The method of present invention increases the energy efficiency and a battery life of the movable object. The movable object may be an unmanned aerial vehicle (UAV).

A method of recycling motor power of a movable object is provided to recycle and redistribute power from at least one motor in a decelerating state. The method comprises determining whether an operating state of at least one motor of the movable object is a decelerating state, and recycling power from the at least one motor having a decelerating state. The method also comprises redistributing the recycled power to other power consuming components of the movable object. The method of present invention increases the energy efficiency and a battery life of the movable object. The movable object may be an unmanned aerial vehicle (UAV).

A method is described for controlling an electric motor having a rotor. The method is carried out after a shutdown of the motor has been initiated. The method includes starting a timer in a motor controller, performing regenerative braking to recapture kinetic energy from the rotor as electrical energy, and using the recaptured electrical energy from the regenerative braking to power the motor controller. If the timer in the motor controller exceeds a predetermined timer value, a flag is set in memory in the motor controller to indicate that the motor has stopped.

A method is described for controlling an electric motor having a rotor. The method is carried out after a shutdown of the motor has been initiated. The method includes starting a timer in a motor controller, performing regenerative braking to recapture kinetic energy from the rotor as electrical energy, and using the recaptured electrical energy from the regenerative braking to power the motor controller. If the timer in the motor controller exceeds a predetermined timer value, a flag is set in memory in the motor controller to indicate that the motor has stopped.

The present invention relates to a motor drive apparatus and, more particularly, to a motor drive apparatus capable of immediately restarting by maintaining sensorless control during a stop operation of a motor. The motor drive apparatus comprises: an inverter for driving a motor by using an AC voltage; and a control unit for controlling operations of a switching element included in the inverter. At this time, when a stop command is input, the control unit decreases a duty ratio of a PWM signal until a present speed of the motor becomes smaller than a predetermined minimum speed, thereby decreasing the revolutions per minute of the motor. Then, when a restart command is input in a state where the duty ratio of the PWM signal is decreased, the control unit can immediately restart the motor by increasing the duty ratio of the PWM signal.