Motor control device and motor unit

A motor control device to control a motor by feedback control, the motor control device comprising:

• an inverter to convert a DC voltage to a three-phase AC voltage and output the three-phase AC voltage to the motor;
• a current sensor to detect a three-phase current flowing through the motor;
• and
• a controller configured or programmed to control an output duty of the inverter by controlling the inverter by pulse width modulation, based on an output signal of the current sensor;
• wherein
• the controller is configured or programmed to execute:
• acquisition processing to acquire a discrete three-phase current I[n] being a discrete-time signal by sampling an output signal of the current sensor at a sampling cycle shorter than a cycle of the feedback control;
• and
• duty calculation processing to reduce a subsequent output duty D[n+1] of the inverter to be smaller than a current output duty D[n] of the inverter when the discrete three-phase current I[n] exceeds a target current value Itgt.