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Induction motor torque/flux control system

  • US 4,885,518 A
  • Filed: 08/21/1987
  • Issued: 12/05/1989
  • Est. Priority Date: 08/21/1987
  • Status: Expired due to Term
First Claim
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1. In an AC induction motor drive including:

  • first means responsive to a flux demand for generating a first signal representative of a direct component reference current;

    second means responsive to a torque demand for generating a second signal representative of a quadrature component reference current;

    third means responsive to a speed signal for generating a third signal representative of a position angle characterizing the current resultant vector of said direct and quadrature components; and

    fourth means responsive to said first, second and third signals for generating three coordinate phase currents for the motor drive;

    the combination ofmeans within said first means for dynamically responding to said flux demand and first limiting means respopnsive to said dynamically responding means for limiting said first signal in magnitude within a predetermined maximum value LIM;

    second limiting means responsive to said first limiting means for establishing with said first signal a limit ALIM defined by the square of said first signal being made equal to (LIM2 -ALIM2);

    said second limiting means being operative upon said second means for limiting said second signal so that said resultant vector remain within the limit ALIM.

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