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Motor control apparatus

  • US 6,469,461 B1
  • Filed: 10/04/2000
  • Issued: 10/22/2002
  • Est. Priority Date: 10/05/1999
  • Status: Active Grant
First Claim
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1. An apparatus for detecting a motor current flowing through delta-connected armature windings of a three-phase brushless dc motor when the motor is operated through a motor driver, comprising:

  • a neutral voltage detecting circuit including three resistors which are connected at one end to the armature windings of the motor, respectively, and at the other end to a common junction, said neutral voltage detecting circuit measuring a voltage developed at the common junction as a neutral voltage V1 of the motor;

    a speed proportional voltage generator generating a voltage V2 proportional to a speed N of the motor according to an equation (1) below; and

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