Motor control device

In order to obtain a motor control device that is capable of suppressing an abnormal operation of a synchronous motor, even of a synchronous motor with no saliency, by detecting a disk misalignment problem immediately after the motor starts operating, this motor control device is characterized by being equipped with: a motor speed detection unit that detects a motor speed from an output signal of an encoder (position sensor) connected to a motor, said motor being a synchronous motor, and outputs the detected motor speed; a motor electrical angle detection unit that detects a motor electrical angle from the output signal of the encoder and outputs the detected motor electrical angle; a motor electrical angle estimation unit that receives inputs of a motor voltage, a motor current, and the detected motor speed, estimates an estimated motor electrical angle from the motor voltage and the motor current, and outputs the estimated motor electrical angle; and a switching unit that receives inputs of the detected mot