×

Method and apparatus to control input to AC induction motors

  • US 6,737,827 B2
  • Filed: 08/08/2002
  • Issued: 05/18/2004
  • Est. Priority Date: 04/10/2001
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method to control input to an alternating current (AC) induction motor from a power supply that comprises steps of:

  • determining a measure of reactive power (VAR) in two input lines to the motor during a time period; and

    maintaining an SSR (solid state relay) connected in series between the power supply and the motor in a non-conducting state for a subsequent time period, the length of which subsequent time period is determined by analyzing the measure of VAR;

    wherein the step of determining a measure comprises determining a product of a voltage difference between the two input lines and a current in one of the lines.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×