Motor control apparatus

  • US 20030001536A1
  • Filed: 06/26/2002
  • Published: 01/02/2003
  • Est. Priority Date: 06/29/2001
  • Status: Active Grant
First Claim
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1. A motor control apparatus comprising:

  • a fundamental wave current control system that controls a fundamental wave component of a motor current in an orthogonal coordinate system which hypothetically rotates in synchronization with a rotation of a 3-phase AC motor;

    a higher harmonic current control system that controls a higher harmonic component contained in the motor current in an orthogonal coordinate system hypothetically rotating with a frequency which is an integral multiple of the frequency of the fundamental wave component of the motor current;

    a voltage command value generating device that generates 3-phase AC voltage command values by adding an output from said fundamental wave current control system and an output from said higher harmonic current control system;

    a power conversion device that converts a DC source voltage to a 3-phase AC voltage corresponding to the 3-phase AC voltage command values and outputs the 3-phase AC voltage to the 3-phase AC motor;

    a voltage saturation detection device which detects that an output voltage from said power conversion device is in a saturated state; and

    a gain adjustment device that reduces a current control gain for said higher harmonic current control system if said voltage saturation detection device detects an output voltage-saturated state.

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