Title: Turntable drive system for video disc player

Abstract: A turntable drive motor comprises a stator having a core defining an airgap for receiving a rotor, and a field winding for establishing an alternating magnetic flux of a given frequency therein. An elastic belt is disposed about a pully mounted on the rotor shaft and a flange secured to the turntable. A ring having a plurality of permanently magnetized poles of alternate polarity along its periphery is attached to the flange. A pair of elements are secured to the core for diverting a portion of the stator magnetic flux to a region adjacent to the ringed magnets. The relationship between the excitation frequency and the number of the permanently magnetized poles is such that deviations in the rate of rotation of the turntable for a desired rotational rate are opposed.

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Inventors: Pyles, Gerald D. (Danville, IN, US)

Application Number: 042919
Filing Date: 1979-05-29
Publication_date: 1980-12-16
Assignee: RCA Corporation (New York, NY)
Primary Class(es): 369/241 318/66, 369/266
Other Classes:
US Patent Ref:

3848146	Nov, 1974	Tourtellot et al.	310/163.
3912283	Oct, 1975	Hammond et al.	274/39.
4100465	Jul, 1978	Hagino	274/39.

Other Refs:
Primary Examiner: Stephan, Steven L.
Assistant Examiner:
Attorney: Whitacre; Eugene M., Tripoli; Joseph S., Kulkarni; Dilip A.