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Control system for regulating the speed of an electric motor including static frequency detector for speed detection and regulation

  • US 4,078,190 A
  • Filed: 06/22/1976
  • Issued: 03/07/1978
  • Est. Priority Date: 06/22/1976
  • Status: Expired due to Term
First Claim
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1. Means for ascertaining the instantaneous rotor speed of an alternating current induction motor having a rotor and a stator and energizable from a source of alternating current electric power comprising:

  • first means for detecting the instantaneous waveform of the current flow in said motor rotor;

    second means for extracting the fundamental frequency from said waveform and for providing a square wave signal related thereto;

    and third means for receiving and converting said square wave signal into an analog voltage signal proportional to speed.

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