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SWITCHING CIRCUIT FOR MOTOR START WINDING

  • US 3,761,792 A
  • Filed: 02/07/1972
  • Issued: 09/25/1973
  • Est. Priority Date: 02/07/1972
  • Status: Expired due to Term
First Claim
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1. In an electric motor having a main winding and a start winding each connecTable with an AC source of voltage, a control circuit for controlling the application of electric power to the start winding, comprising:

  • main winding circuit means connecting said main winding to said AC source;

    switch means connected between said start winding and said AC source and gatable to couple current to said start winding; and

    control means for gating said switch means to cause current flow through said start winding, the phase of said current through said start winding relative to the phase of said voltage varying with motor speed, said control means including reference means for developing a reference signal related to the phase of the voltage from said AC source, and network means responsive to a predetermined change in the relative phase between said reference signal and the phase of current through said start winding for terminating the gating of said switch means.

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