CONTROL DEVICE OF SYNCHRONOUS ELECTROMOTOR, ELECTRICAL EQUIPMENT, AND MODULE

This invention provides the controller of a synchronous motor. It realizes a low vibration and low noise variable speed drive by suppressing a periodic interference in a driver. When a load unit generates the periodic interference in the driver, it calculates the rotor position of an AC synchronous motor, and by means of detecting a rotating speed directly. The resolving method is that: A sensorless drive is realized by calculating a difference (axial error) between the position of the magnetic flux axis of the AC synchronous motor. The position of the magnetic flux axis assumed in a controller, and correcting the rotating speed, such that the difference becomes zero. Further, according to the calculated value of this axial error, and by means of compensating, it is performed by providing a means for extracting the pulsation component of the torque generated from the motor or the load unit