Motor control device for switching pwm frequency to use the same

A motor control device comprising:

• an inverter that inverts DC voltage into AC voltage at a specified PWM frequency by PWM control using a power device to apply the AC voltage to a motor;
• a power device temperature obtaining unit that obtains a temperature of the power device of the inverter;
• a motor temperature obtaining unit that obtains a temperature of the motor;
• a power device temperature determination level storage unit that stores a power device temperature determination level;
• a motor temperature determination level storage unit that stores a motor temperature determination level;
• a PWM frequency storage unit that stores at least two PWM frequencies including a high PWM frequency higher than the specified PWM frequency, and a low PWM frequency lower than the specified PWM frequency;
• a power device temperature determining unit that determines whether or not the temperature of the power device is equal to or higher than the power device temperature determination level;
• a motor temperature determining unit that determines whether or not the temperature of the motor is equal to or higher than the motor temperature determination level;
• and
• a PWM frequency selecting unit that selects a PWM frequency to be given as a command to the inverter, from the specified PWM frequency and the at least two frequencies on the basis of determination results of the power device temperature determining unit and the motor temperature determining unit.