Motor control device and electric power steering device

A motor control device comprising:

• a first calculation unit that obtains a current that needs to be supplied to a motor, and
• a second calculation unit that
• obtains an overheat protection coefficient when current obtained from the first calculation unit flows through using an overheat protection feature, and
• obtains a current that is actually supplied to the motor using the obtained overheat protection coefficient, wherein
• the overheat protection feature:
• shows a relationship between how large the current is, and the overheat protection coefficient, where the current is regulated by taking into account an effect that heat generated by a part out of a plurality of parts disposed on a pathway which the current that is supplied to the motor flows through has on an ambient temperature, and an effect that heat generated by other parts out of the plurality of parts has on the ambient temperature, and
• the second calculation unit
• retains:
• a first overheat protection feature that is the overheat protection feature in a case where the motor is stopped, and
• a second overheat protection feature different from the first overheat protection feature, that is the overheat protection feature in a case where the motor is rotating, and
• obtains the overheat protection coefficient when a current obtained from the first calculation unit flows through, whether the motor is rotating or is stopped, using the first overheat protection feature or the second overheat protection feature.