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Method and apparatus for reducing generated heat in three-phase motors driving air circulation fans in large industrial refrigerators and freezers

  • US 7,015,673 B1
  • Filed: 01/08/2004
  • Issued: 03/21/2006
  • Est. Priority Date: 01/08/2004
  • Status: Expired due to Fees
First Claim
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1. An apparatus for reducing heat generated by a tree-phase motor operating under load, comprising, in combination:

  • a power supply;

    said three-phase motor coupled to a fan and to said power supply, said motor connected to said power supply by means of three power conductors;

    a plurality of capacitors, said capacitors inserted into said power conductors such that equal capacitance is introduced into each said power conductor;

    wherein said plurality of capacitors are mounted in a separate bank; and

    further comprising means to select power input level connected to said motor, wherein said means to select power input level alternatively connects said motor to said power supply and said capacitor bank.

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