Motor control device and motor control method

A motor control device that is connected to an inverter that converts direct current power into three-phase alternating-current power and outputs the converted power to a motor, and controls operation of the inverter to control drive of the motor by using the inverter, the motor control device comprising:

• a current control unit that calculates a voltage command with respect to a d-axis and a q-axis of the motor at every predetermined calculation cycle;
• a carrier wave generation unit that generates a carrier wave;
• a carrier wave frequency adjustment unit that adjusts a frequency of the carrier wave;
• a phase calculation unit that calculates a voltage phase of the inverter based on a rotation position of the motor;
• a divided phase calculation unit that calculates a divided phase in which the voltage phase is divided for every predetermined division number of two or more;
• a three-phase voltage conversion unit that converts the voltage command into a three-phase voltage command based on the divided phase;
• and
• a PWM control unit that performs pulse width modulation on the three-phase voltage command using the carrier wave and generates a PWM pulse signal for controlling operation of the inverter.