Turntable speed lock system

Details Turntable speed lock system Turntable speed lock system

G - Physics

11

B

181/68, 352/21.2

G11B 3/60 (2006.01) G11B 19/28 (2006.01)

Patent

CA 1069211

A TURNTABLE SPEED LOCK SYSTEM Abstract of the Disclosure A turntable speed lock system is provided to supplement an inexpensive main motor which drives the turntable through a pulley-belt arrangement, and which main drive arrangement fails to maintain the turntable rotation at a predetermined speed within specified tolerance limits desired for proper operation. A rotor ring, having a plurality of permanently magnetized poles of alternate polarity along its periphery, is mounted concentrically on the turntable for rotation therewith. A stator assembly including a core with an airgap, for receiving the rotatable rotor ring, is fixedly mounted on a turntable mounting plate. The stator assembly further includes a field winding for establishing an alternating field across the airgap. The magnetized poles freely pass, a seriatim, through the airgap when the turntable-mounted rotor ring is rotated by the main motor. The rotor ring and stator assembly function as a synchronous motor wherein the reluctance across the airgap is minimum when the turntable- mounted rotor ring is rotating at the predetermined speed, thereby locking the turntable to rotate at the predetermined speed within the specified tolerance limits. -1-

233779

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