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Load and speed sensitive motor starting circuit

  • US 4,622,506 A
  • Filed: 12/11/1984
  • Issued: 11/11/1986
  • Est. Priority Date: 12/11/1984
  • Status: Expired due to Fees
First Claim
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1. In an AC motor having a main winding and an auxiliary winding both connectable to an AC power source, and having a switch for disconnecting said auxiliary winding from said AC source, an improved control circuit for said switch comprising:

  • main voltage detector means for sensing the magnitude of the AC main winding voltage;

    auxiliary voltage detector means for sensing the magnitude of the AC auxiliary winding voltage;

    initialization means sensing main winding voltage at initial energization of said motor;

    flip flop means responsive to said initialization means to output a turn-on signal to said switch to connect said auxiliary winding to said AC source;

    voltage comparator means responsive to said main and auxiliary detector means and comparing the magnitude of the auxiliary winding voltage against the magnitude of the main winding voltage;

    said flip flop means also being responsive to said voltage comparator means to output a turn-off signal to said switch to disconnect said auxiliary winding from said AC source when the magnitude of the auxiliary winding voltage increases above a predetermined value relative to the magnitude of the main winding voltage as a function of motor speed.

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