Method and apparatus for providing thermal protection for large

Details Method and apparatus for providing thermal protection for large Method and apparatus for providing thermal protection for large

1988-04-28

1990-04-03

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

318490, G01R 2700, H02P 540

Patent

active

049143867

ABSTRACT:
A microprocessorized thermal protection system and accompanying method measures input voltage and current of an induction motor and derives therefrom continuously updated estimates of the slip dependent rotor resistance during acceleration of the motor. The measurements and calculations of the varying rotor resistance enable determination of the heat generated within the motor based on a thermal model thereof. Phase shift distortions induced by the measurement system are accounted for by determining the value of the stator resistance at start up. In addition, during a brief period following start up, sampling of the voltage/current inputs is suspended to avoid the effects of the initially occurring DC-offset resulting from the application of the voltage input to the inductive motor load.

REFERENCES:
patent: 2568406 (1951-09-01), Packer et al.
patent: 2640100 (1953-05-01), Packer et al.
patent: 4413325 (1983-11-01), Elfner et al.
patent: 4441065 (1984-04-01), Bayer et al.
patent: 4442393 (1984-04-01), Abbondanti
patent: 4525763 (1985-06-01), Hardy et al.
patent: 4670698 (1987-06-01), Fulton et al.
Deshpande et al.; "A New Method of Determining Rotor Leakage Reactance and Resistance of a Three Phase Induction Motor"; The Institution of Electrical Engineers; paper #2757u; Feb. 1959; pp. 46-50.

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