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Integrated electric motor monitor

  • US 6,529,135 B1
  • Filed: 10/12/1999
  • Issued: 03/04/2003
  • Est. Priority Date: 10/12/1999
  • Status: Expired due to Term
First Claim
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1. A method for monitoring an operational condition of an electric motor, and for storing in a memory device information indicative of the motor'"'"'s operational condition, where the motor rotates at a rotational speed to drive a load, generates vibration and magnetic flux, and attains a temperature when a voltage is applied to the motor, the method comprising the steps of:

  • (a) sensing characteristics indicative of the operational condition of the electric motor;

    (b) generating sensor signals related to the sensed characteristics, the sensor signals including a speed signal, a temperature signal, and a voltage signal;

    (c) extracting a speed value from the speed signal, a temperature value from the temperature signal, and a voltage value from the voltage signal, where the speed value, temperature value, and voltage value are numerical values indicative of the speed, temperature, and voltage, respectively, of the electric motor;

    (d) combining the speed value, temperature value, and voltage value to form a profile prognosis value;

    (e) during a learning period, repeating steps (a)-(d) n number of times to determine n number of profile prognosis values; and

    (f) determining a most common profile prognosis value which is the profile prognosis value of the n number of profile prognosis values occurring most often during the learning period.

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