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Switching circuit providing adjustable capacitive series voltage dropping circuit with a fractional horsepower motor

  • US 4,992,709 A
  • Filed: 06/20/1989
  • Issued: 02/12/1991
  • Est. Priority Date: 06/20/1989
  • Status: Expired due to Term
First Claim
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1. For use in combination with a fractional horsepower alternating current motor connected between hot and neutral wires to impose a series impedance reducing the voltage applied to the motor, a motor control system which comprises:

  • (a) at least two independent parallel capacitors connected in series with a motor and connected in series with the hot wire for conducting alternating current power to the motor;

    (b) first and second switching devices, each thereof being connected in series with one of said capacitors, wherein said switching devices conduct alternating current flowing between the hot and neutral wires and are controllably switched between off and on states to thereby control alternating current flow through the respectively connected capacitors; and

    (c) control means connected to said switching devices for providing control signals to said switching devices to selectively switch said switching devices to the on state and the off state.

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