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Motor starting circuit with time delay cut-out and restart

  • US 4,786,850 A
  • Filed: 08/13/1987
  • Issued: 11/22/1988
  • Est. Priority Date: 08/13/1987
  • Status: Expired due to Fees
First Claim
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1. In a single phase AC induction motor having a main winding and a start winding both connectable to an AC power source, and having start switch means in series with said start winding for disconnecting said start winding from said AC source, an improved time delay disconnect control comprising:

  • turn-on switch means connected across said start switch means and not across said start winding, and turning on said start switch means to connect said start winding to said AC source at energization of said motor;

    cut-out switch means turning off said start switch means to disconnect said start winding from said AC source after a given time delay following said energization;

    timing means connected across said AC source and coupled to said cut-out switch means to provide said time delay following said energization,wherein said timing means comprises an RC timing circuit including a resistor and a timing capacitor, said RC timing circuit being connected across said AC source in parallel with said main winding and in parallel with the series connectd start winding and start switch means, and comprising restart switch means connected in series with said RC timing circuit and sensing start winding voltage and turning ON to permit charging of said timing capacitor when said start winding voltage is above a given value.

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