MOTOR CONTROL DEVICE THAT CONTROLS d-AXIS CURRENT OF PERMANENT MAGNET SYNCHRONOUS MOTOR

A motor control device comprising:

• a q-axis current and d-axis current detection unit configured to detect a q-axis current and a d-axis current of a permanent magnet synchronous motor having a stator provided with one of a group of windings and a group of permanent magnets and a rotor provided with the other thereof, based on at least two of a first phase current, a second phase current and a third phase current flowing through the permanent magnet synchronous motor and a position of the rotor;
• a q-axis current command value generation unit configured to generate a q-axis current command value based on a speed command value for the rotor;
• a d-axis current command value generation unit configured to generate a d-axis current command value, in which an amount of rise in the temperature of the permanent magnets in a steady state of the permanent magnet synchronous motor is a minimum, based on a speed of the rotor;
• and
• a drive unit configured to drive the permanent magnet synchronous motor based on the q-axis current, the d-axis current, the q-axis current command value, and the d-axis current command value.