Feedback circuit controls fluctuations in speed of synchronous ac motor. Voltage proportional to phase angle is developed by phase detector, rectified, amplified, compared to threshold, and reapplied positively or negatively to motor excitation circuit. Speed control reduces wow and flutter of audio turntables and tape recorders, and enhances hunting in gyroscope motors.


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    Title :

    Speed control for synchronous motors


    Contributors:
    Packard, H. (author) / Schott, J. (author)

    Published in:

    Publication date :

    1981-04-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English





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