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Synchronous reluctance motor control device

  • US 6,822,417 B2
  • Filed: 05/11/2004
  • Issued: 11/23/2004
  • Est. Priority Date: 03/22/2002
  • Status: Expired due to Fees
First Claim
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1. A motor control apparatus of a synchronous reluctance motor comprising:

  • a current detector that detects a motor current flowing in a stator winding of the synchronous reluctance motor;

    a position and speed estimation unit that estimates an induced voltage of the synchronous reluctance motor from the detected value by the current detector and a voltage command which is a command to a voltage to be applied to the stator winding of the synchronous reluctance motor, and estimated rotor position and rotating speed of the synchronous reluctance motor on the basis of the estimated induced voltage;

    a speed control unit that determines a current command which is a command to a current to be supplied to the stator winding of the synchronous reluctance motor so as to eliminate the error of the estimated rotating speed by the position and speed estimation unit and a target value of the rotating speed given from outside;

    a distribution unit that distributes the current command from the speed control unit into a torque current command which is a torque current component of the current command and a field current command which is a field current component of the current command, on the basis of a predetermined current phase angle of the synchronous reluctance motor;

    a torque current correction unit that corrects the torque current command on the basis of the torque current command from the distribution unit and the estimated rotating speed from the position and speed estimation unit, so that a load torque generated by a load element of the synchronous reluctance motor coincides with the output torque of the synchronous reluctance motor;

    a current control unit that generates a voltage command so as to eliminate the error between the corrected torque current command from the torque current correction unit and the detected motor current from the current detector, and the error between the field current command from the distribution unit and the detected motor current obtained from the current detector; and

    a conduction distribution unit that distributes conduction signals into driving elements in the synchronous reluctance motor on the basis of the voltage command.

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