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Speed control for synchronous motorsFeedback 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.
Document ID
19800000444
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Packard, H.
(Northrop Corp.)
Schott, J.
(Northrop Corp.)
Date Acquired
August 10, 2013
Publication Date
April 1, 1981
Publication Information
Publication: NASA Tech Briefs
Volume: 5
Issue: 4
ISSN: 0145-319X
Subject Category
Electronic Components And Circuits
Report/Patent Number
MSC-18680
Accession Number
80B10444
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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