Method and apparatus for controlling alternating current motors

Details Method and apparatus for controlling alternating current motors Method and apparatus for controlling alternating current motors

1981-08-05

1983-11-22

Truhe, J. V.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318806, 318808, H02P 540

Patent

active

044171935

ABSTRACT:
In a method and apparatus for controlling a speed of an AC motor energized by a source of alternating current through a frequency converter, a limiter responsive to input voltage and input current is provided for decreasing a primary frequency at a rate faster than a rate of decrease in a number of revolutions of the motor when the source is interrupted for a short interval and for accelerating the motor with a primary current thereof limited to a predetermined value while maintaining the primary frequency and the primary current in a predetermined relation.

REFERENCES:
patent: 3781616 (1973-12-01), Mokrytzki
patent: 4243927 (1981-01-01), D'Atre

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