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METHOD AND APPARATUS ANALYZING AND MONITORING THE PERFORMANCE AND OPERATION OF MACHINES AND PROCESSES DRIVEN BY ELECTRICAL MOTORS

  • US 3,839,628 A
  • Filed: 08/09/1972
  • Issued: 10/01/1974
  • Est. Priority Date: 08/09/1972
  • Status: Expired due to Term
First Claim
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1. A method of determining the characteristics signature of a machine driven by electric motor including the steps:

  • measuring the electric power applied to the drive motor during a standard operating cycle of the machine;

    storing the information with respect to the frequency spectrum distribution of power applied to the motor during standard operating cycle;

    changing one or more of the machine operating parameters required for standard operation;

    measuring the power applied to the drive motor during an operating cycle in which said one or more parameters has been varied;

    storing the information with respect of the frequency spectrum distribution of power applied to the motor during the operating cycle in which one or more parameters has been varied;

    comparing the information concerning frequency spectrum distribution of power for a standard operating cycle with the information concerning frequency spectrum distribution of power for an operating cycle in which said one or more parameters has been varied;

    determining from the comparing step components of power which exhibit relatively small changes during the operating cycle in which one or more parameters has been varied as compared with the standard operating cycle; and

    determining from the comparing step components of power which exhibit relatively large changes during the operating cycle in which one or more parameters has been varied as compared with the standard operating cycle.

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