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Means for stabilizing an a-c electric motor drive system

  • US 4,088,934 A
  • Filed: 10/04/1976
  • Issued: 05/09/1978
  • Est. Priority Date: 10/04/1976
  • Status: Expired due to Term
First Claim
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1. An improved stabilizing scheme for an a-c electric motor comprising a stator and a rotor and provided with a source of excitation comprising electric power conversion apparatus that supplies a-c power of variable frequency to said stator, said motor being capable of developing electromagnetic force tending to move the rotor relative to the stator due to the interaction of current and flux in the motor when excited, wherein the improvement comprises:

  • a. first means coupled to said motor for deriving an angle feedback signal representative of the actual phase angle between said interacting current and flux in the motor when excited; and

    b. second means responsive to said angle feedback signal for controlling the motor excitation as a function of said angle feedback signal.

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