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Motor control apparatus

  • US 20030222617A1
  • Filed: 05/23/2003
  • Published: 12/04/2003
  • 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; and

    control means for rotating the rotor 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, wherein in an initial drive that is performed after application of power, the control means learns a corresponding relationship between a count of the output signal of the encoder, a rotation position of the rotor, and a current supply phase at an end of the initial drive by counting pulses of the output signal of the encoder by effecting current supply for all phases of the motor around according to a prescribed time schedule, and wherein in an ordinary drive that is performed after the initial drive, the control means determines a current supply phase on the basis of a count of the output signal of the encoder and a learning result that is obtained at the end of the initial drive.

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