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System and method for clamp current regulation in field-weakening operation of permanent magnet (PM) machines

  • US 20050046370A1
  • Filed: 08/26/2003
  • Published: 03/03/2005
  • Est. Priority Date: 08/26/2003
  • Status: Active Grant
First Claim
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1. A device to regulate current provided to a permanent magnet (PM) machine responsive to a plurality of phase current signals to produce torque on a shaft comprising:

  • a processing and drive circuit responsive to a direct voltage command signal and a quadrature voltage command signal, said processing and drive circuit configured to produce said plurality of phase current signals for input to said permanent magnet machine;

    a current regulator including, a command circuit responsive to a torque input command signal configured to produce a direct current command signal and a quadrature current command signal;

    a control circuit responsive to the direct and quadrature current command signals configured to produce said direct and quadrature voltage command signals; and

    a limiter configured to limit the direct and quadrature voltage command signals to a preselected level.

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