Motor control device

A motor control device comprising:

• a motor that serves as a driving source of a control target;
• a rotation sensor that outputs a signal according to a rotation of the motor;
• a motor control unit that controls a rotation position of the motor based on an output signal of the rotation sensor;
• a state monitoring unit that detects a power supply abnormality in which a power is not normally supplied to at least one of the rotation sensor and the motor;
• an abnormality determination unit that detects an abnormality of the rotation sensor based on the output signal of the rotation sensor;
• and
• a decision unit that decides whether to confirm the abnormality of the rotation sensor based on a detection result of the state monitoring unit and a detection result of the abnormality determination unit, wherein
• the state monitoring unit executes a preliminary detection to detect the power supply abnormality based on a state of a driving power supply before the motor is driven to rotate, and an interim detection to detect the power supply abnormality based on the state of the driving power supply while the motor is driven to rotate, and
• when the state monitoring unit detects the power supply abnormality, the decision unit does not decide the abnormality of the rotation sensor even when the abnormality determination unit detects the abnormality of the rotation sensor.