Motor driving unit

A motor driving unit for driving a vehicle driving motor by using a battery as a power source, comprising:

• an inverter that converts DC power supplied from the battery into AC power, and that supplies the AC power to the motor;
• a controller that performs driving control of the motor by controlling the inverter, based on a rotation frequency of the motor;
• a capacitor that is connected in parallel to an input side of the inverter;
• and
• a voltage sensor that detects an inter-terminal voltage of the capacitor,
• wherein during regeneration of the motor, the controller performs output stopping control for causing the inverter to stop an output of the AC power, when the inter-terminal voltage of the capacitor which is detected by the voltage sensor is equal to or greater than a first threshold value,
• wherein the controller performs output restarting control for causing the inverter to restart the output of the AC power, when the inter-terminal voltage of the capacitor which is detected by the voltage sensor is equal to or smaller than a second threshold value which is smaller than the first threshold value, and
• wherein the controller performs regenerative braking by allowing the output stopping control and the output restarting control to be repeatedly performed.