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Motor driving control device

  • US 20070132424A1
  • Filed: 12/05/2006
  • Published: 06/14/2007
  • Est. Priority Date: 12/08/2005
  • Status: Active Grant
First Claim
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1. A motor driving control device that performs driving control of a motor, wherein let an axis parallel to a magnetic flux produced by a permanent magnet forming a rotor of the motor be called a d axis, and let an axis estimated, for a purpose of control, to correspond to the d axis be called a γ

  • axis, then the motor driving control device comprises;

    a voltage feeder that applies an alternating voltage or a rotation voltage having a predetermined frequency to the motor as a detection voltage;

    an extractor that extracts, from a γ

    -axis component of a motor current that flows through the motor, a partly-extracted γ

    -axis current obtained by attenuating at least a direct-current component of the γ

    -axis component; and

    a detector that detects a polarity of a magnetic pole of the rotor by a use of the partly-extracted γ

    -axis current.

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