Motor control device

A motor drive system, comprising:

• a motor;
• a rotation transmission system provided with a drive limiting portion configured to limit the drive while a rotation of the motor is transmitted and driven;
• and
• a motor control device configured to control a drive of the motor, wherein
• the motor control device includes a computer including a processor and a memory that stores instructions configured to, when executed by the processor, cause the processor to
• control an energization to the motor,
• determine whether or not there is a possibility of an excessive return exceeding an allowable return position, when a non-energization return control is performed to return the motor in a direction away from a movable limit position by an external force generated in the rotation transmission system by turning off the energization to the motor after driving the motor to the movable limit position where the drive is restricted by the drive limiting portion,
• turn off continuously the energization to the motor, when it is determined that there is no possibility of the excessive return, and
• stop the motor by energizing, when it is determined that there is a possibility of the excessive return.