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Method and apparatus for controlling the input to 3-phase AC induction motors

  • US 20070024250A1
  • Filed: 08/01/2005
  • Published: 02/01/2007
  • Est. Priority Date: 08/01/2005
  • Status: Active Grant
First Claim
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1. In a method of controlling the input to a three phase inductive load from a three phase AC power supply wherein a measure of reactive power in at least one input line to the load is determined during a time period, and a solid state relay is connected in series in said input line between the power supply and the inductive load and maintained in a non-conducting state for a subsequent period of time, the length of which subsequent period of time is determined by analyzing the measure of VAR, the improvement comprising:

  • analyzing the measure of VAR using a controller dedicated to handling the calculation for said one input line.

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