NASA NTRS · 19800000444
Speed control for synchronous motors
Abstract
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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Packard, H., Schott, J.. 1981-04-01. Speed control for synchronous motors. https://ntrs.nasa.gov/citations/19800000444
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