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Motor control apparatus

  • US 6,900,613 B2
  • Filed: 11/20/2003
  • Issued: 05/31/2005
  • Est. Priority Date: 12/03/2002
  • Status: Expired due to Fees
First Claim
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1. A motor control apparatus for driving, by means of a power converter such as inverter, a synchronous motor such as brushless motor not provided with a sensor for detecting a motor axis position, comprising:

  • phase current detecting means for detecting phase currents to the synchronous motor;

    current phase calculating means for calculating a current phase based on the phase currents detected by said phase current detecting means;

    voltage phase setting means for setting a voltage phase that is determined by adding a predetermined phase difference to the current phase calculated by said current phase calculating means;

    command voltage determining means for determining a command voltage based on a rotational speed command; and

    phase voltage setting means for setting phase voltages to the synchronous motor based on the voltage phase set by said voltage phase setting means and the command voltage determined by said command voltage determining means.

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