Variable slip controller for an AC motor
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United States of America Patent
Stats
-
Mar 20, 1984
Grant Date -
N/A
app pub date -
Dec 24, 1981
filing date -
Dec 24, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control system is provided in which a signal proportional to the actual rotor speed of an induction motor is coupled to a variable gain amplifier. Changes in the commanded gain of the amplifier electronically control the ratio between rotor speed and the output signal amplitude of the variable gain amplifier. The output of the variable gain amplifier determines the commanded stator frequency. Disks optically encoded with a PWM pattern are driven at a speed which corresponds to the commanded stator frequency. Optical sensors read the pattern and provide switching signals to an inverter coupled to an induction motor.
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Cited Art Landscape
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