Motor Control Device

A motor control device comprising:

• a torque designation value input unit that inputs a torque designation value indicating a necessary torque value;
• a rotational speed input unit that inputs a rotational speed of a motor;
• a control unit that calculates necessary power that is necessary to drive the motor in accordance with the torque designation value being input and the rotational speed of the motor being input and calculates a voltage value and a current value that are necessary to drive the motor in accordance with the necessary power being calculated;
• a voltage supply unit that outputs a voltage in accordance with the voltage value being calculated;
• and
• an inverter unit that generates a drive signal for driving the motor from the voltage output from the voltage supply unit in accordance with the current value being calculated,
• wherein the control unit:
• sets the voltage value to a predetermined voltage value and changes the current value in accordance with the necessary power in a case in which the necessary power being calculated is less than a predetermined threshold value, and
• sets the current value to a predetermined current value and changes the voltage value in accordance with the necessary power in a case in which the necessary power being calculated is equal to or greater than the predetermined threshold value.