Patent ID: 6529135
Filing Date: 2003-03-04
Classification: G01R,H02P

Abstract:
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.