Method and apparatus for analysis of polyphase electrical motor

Details Method and apparatus for analysis of polyphase electrical motor Method and apparatus for analysis of polyphase electrical motor

1993-06-29

1996-05-21

Wysocki, Jonathan

Electricity: motive power systems

Induction motor systems

Power-factor control

324 7611, H02P 600, G01L 300

Patent

active

055193005

ABSTRACT:
A method for determining at least one operating parameter to determine the operating condition of a polyphase electric motor system comprises sensing the instantaneous current signal and the instantaneous voltage signal as a function of time for more than one electrical phase of the motor. The sensed current signals and the sensed voltage signals are both amplitude demodulated and phase demodulated to provide amplitude demodulated current and voltage signals as a function of time and phase demodulated current and voltage signals as a function of time. The resulting amplitude and phase demodulated signals are used to determine one or more of the following electrical parameters as a function of time: total real power, real power per phase, total reactive power, reactive power per phase, total apparent power, apparent power per phase, overall power factor, power factor per phase, electrical impedance per phase, and electrical balance.

REFERENCES:
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patent: 4356440 (1982-10-01), Curtiss et al.
patent: 4356443 (1982-10-01), Emery
patent: 4851766 (1989-07-01), Shiobara et al.
patent: 4949362 (1990-08-01), Gaubatz
patent: 4978909 (1990-12-01), Hendrix et al.
patent: 5190185 (1992-04-01), Ball

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