Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Having electrical synchronizing interconnections
Patent
1977-07-20
1978-07-11
Smith, Jr., David
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Having electrical synchronizing interconnections
274 39A, A02P 546
Patent
active
041004655
ABSTRACT:
A motor-driven turntable supports, for rotation therewith, a concentric ring having a plurality of permanently magnetized poles of alternate polarity symmetrically disposed along its periphery. A magnetizable core includes a pair of pole pieces having spaced surfaces defining an air gap across which magnetic flux is directed when a winding on the core is energized with alternating current. The magnetizable core is fixedly mounted such that the permanently magnetized poles pass, a seriatim, through the core gap when the turntable is rotating. The magnetized ring and the energized core form a synchronizer which opposes deviations of the turntable speed from a predetermined speed corresponding to the winding energization current frequency divided by half the number of the poles. A capacitor is connected in series with the synchronizer winding for establishing a load which exhibits a resonance at the winding energization current frequency. Means, including a crystal controlled oscillator and a frequency divider, are provided for developing a square wave output at the winding energization current frequency. Means, comprising a power amplifier including transistors operating in a switching mode, are provided for applying the square wave output of the developing means to the resonant load.
REFERENCES:
patent: 2999186 (1961-09-01), Pritchard et al.
patent: 3912283 (1975-10-01), Hammond et al.
Kulkarni Dilip A.
RCA Corporation
Smith Jr. David
Tripoli Joseph S.
Whitacre Eugene M.
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