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Compensation for input voltage variation in an electric motor drive

  • US 5,724,477 A
  • Filed: 06/07/1995
  • Issued: 03/03/1998
  • Est. Priority Date: 04/20/1995
  • Status: Expired due to Term
First Claim
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1. A method of compensating for deviations in actual DC link voltage from a desired DC link voltage in an electric drive system including a machine controller that controls a machine in response to a speed signal, the machine including a rotor, and stator windings, the rotor rotating at an actual rotor speed during operation of the machine, wherein the machine controller selectively applies the actual DC link voltage to the machine stator windings, the method comprising the steps of:

  • periodically sampling the actual DC link voltage and converting the sampled DC link voltage into a digital representation;

    periodically sampling the actual rotor speed and converting the sampled actual rotor speed to a digital representation;

    generating a compensation factor from the digital representation of the sampled DC link voltage;

    multiplying the digital representation of the actual rotor speed by the compensation factor to produce a compensated speed signal; and

    transmitting the compensated speed signal to the electric machine controller and using the compensated speed signal to control the application of the actual DC link voltage to the machine stator windings.

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