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Harmonic torque ripple reduction at low motor speeds

  • US 7,768,220 B2
  • Filed: 04/24/2008
  • Issued: 08/03/2010
  • Est. Priority Date: 04/24/2008
  • Status: Active Grant
First Claim
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1. A method for reducing torque ripple in an electric motor for use in an electric motor drive system for a vehicle, wherein the electric motor is coupled to an inverter, which is coupled to a current regulated control module, wherein the inverter is configured to drive the electric motor, the method comprising:

  • receiving a torque command;

    determining a cancellation current command based on the torque command;

    generating a harmonic cancellation command based on the cancellation current command, wherein the harmonic cancellation command is generated to compensate for a phase shift and an attenuation introduced by the current regulated control module; and

    providing the harmonic cancellation command to the current regulated control module, wherein the current regulated control module is configured to control the inverter in response to the harmonic cancellation command and the torque command.

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