Patent ID: 7852039

Claim:
A control apparatus for controlling an alternating current rotary machine including a stator and a rotor, the stator having a coil wound thereon, in which at least one of said stator and said rotor is divided into at least two separate elements which are so configured that a phase difference representative of a relative position difference between one separate element and another can be varied in a circumferential direction, said control apparatus comprising: an actuator for adjusting a voltage induced in the coil of said stator, due to rotation of said rotor, by driving at least one of said separate elements; a magnetic flux command calculator for calculating a desired magnetic flux amplitude command based on rotating speed of said alternating current rotary machine; a magnetic flux estimator for calculating estimated magnetic flux amplitude of said alternating current rotary machine; a speed command calculator for calculating an actuator speed command to be given to said actuator so that the estimated magnetic flux amplitude follows the magnetic flux amplitude command; and an actuator controller for controlling said actuator according to the actuator speed command.