Motor control device, electromechanical unit, electric vehicle system, and motor control method

A motor control device connected to a power converter that performs power conversion from direct current power to alternating current power, and configured to control drive of an alternating current motor driven with the alternating current power,

• the motor control device comprising:
• a current control unit configured to generate a voltage command in accordance with a torque command;
• a carrier wave generation unit configured to generate a carrier wave;
• a carrier wave frequency adjusting unit configured to adjust a frequency of the carrier wave;
• and
• a gate signal generation unit configured to perform pulse width modulation of the voltage command based on the carrier wave, so as to generate a gate signal to control an operation of the power converter, wherein
• the carrier wave frequency adjusting unit adjusts the frequency of the carrier wave, so as to change a phase difference between a phase of the voltage command and a phase of the carrier wave, and
• the current control unit corrects an amplitude of the voltage command and the phase of the voltage command based on the phase of the carrier wave, when a modulation rate in accordance with a voltage amplitude ratio between the direct current power and the alternating current power exceeds a predetermined value.