Motor speed control circuit

Details Motor speed control circuit Motor speed control circuit

H - Electricity

02

P

342/29, 318/96

H02P 5/00 (2006.01) G11B 19/28 (2006.01) H02P 23/00 (2006.01)

Patent

CA 1127234

ABSTRACT OF THE DISCLOSURE A motor speed control circuit, for example, for the turntable drive motor of a phonograph record player, is of the type having a phase-locked loop including a frequency- divider with a dividing ratio which is changeable for altering the rotational speed of the motor, for example, so as to selectively establish turntable speeds of 45 rpm and 33 1/3 rpm, and has the gain of one of the components of the phase- locked loop, such as, the servo-amplifier, the loop filter or the phase comparator, varied in accordance with changes in the dividing ratio of the frequency-divider so that the loop gain of the phase-locked loop is maintained substantially constant regardless of the rotational speed of the motor.

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