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Motor control apparatus

  • US 20090193923A1
  • Filed: 03/19/2009
  • Published: 08/06/2009
  • Est. Priority Date: 06/03/2002
  • Status: Active Grant
First Claim
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1. A motor control apparatus comprising:

  • an encoder for producing a pulse output signal in synchronism with rotation of a rotor of a motor;

    control means for rotating the rotor to a target position by detecting a rotation position of the rotor on the basis of a count of the output signal of the encoder and sequentially switching a current supply phase of the motor;

    reversing monitoring means for monitoring a variation direction of the count of the output signal of the encoder, and determining whether a rotation direction of the rotor has been reversed from a rotation direction toward the target position; and

    reversed rotation preventing means for prohibiting current supply for A-phase with which the rotor is driven in a reversed direction when the reversing monitoring means has detected reversing.

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