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Method for controlling an electronically commutated DC motor

  • US 6,838,841 B2
  • Filed: 01/29/2002
  • Issued: 01/04/2005
  • Est. Priority Date: 03/30/2001
  • Status: Expired due to Fees
First Claim
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1. A method of controlling an electronically commutated DC motor, the method comprising:

  • providing a multiphase stator winding having an even number of winding phases parallel to one another;

    connecting each of the winding phases in series with one of a plurality of controllable semiconductor switches;

    cycling the plurality of controllable semiconductor switches in a lower output range of the electronically commutated DC motor using a pulse control factor, which is predefinable as a function of a rpm, within consecutive periods when individual ones of the winding phases are energized; and

    achieving a setpoint pulse control factor required for a setpoint rpm within a selected set range of the pulse control factor by alternating between setting a first pulse control factor that is greater than the setpoint pulse control factor and a second pulse control factor that is smaller than the setpoint pulse control factor, the setting of the first and second pulse control factors being varied over time so that a voltage that regulates the rpm at the setpoint rpm is set across the stator winding as an average over time.

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