CONTROLLER OF SYNCHRONOUS MOTOR, ELECTRIC APPARATUS AND MODULE

摘要

PROBLEM TO BE SOLVED: To provide the controller of a synchronous motor which can realize a low vibration and low noise variable speed drive by suppressing a periodic disturbance in a driver or when a load unit generates the periodic disturbance in the driver which does not have the rotor position of an AC synchronous motor and a means for detecting directly a rotating speed.

SOLUTION: A sensorless drive is realized by calculating a difference (axial error)between the position of the magnetic flux axis of the AC synchronous motor and the position of the magnetic flux axis assumed in a controller, and correcting the rotating speed so that the difference becomes zero. Further, it is performed by providing a means for extracting the pulsating component of the torque generated from the motor or the load unit based on the calculated value of this axial error and a means for compensating it.

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