Motor speed control circuit

Details Motor speed control circuit Motor speed control circuit

1980-10-29

1985-02-05

Dobeck, B.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318318, 318327, 318341, H02P 540

Patent

active

044980345

ABSTRACT:
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 331/3 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.

REFERENCES:
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patent: 3008075 (1961-11-01), Scott
patent: 3086157 (1963-04-01), Branco
patent: 3110853 (1963-11-01), Jones
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patent: 3843914 (1974-10-01), Carlson et al.
patent: 4223261 (1980-09-01), White
patent: 4227137 (1980-10-01), Hartman
patent: 4271382 (1981-06-01), Maeda et al.
patent: 4278925 (1981-07-01), Minakuchi
Modern Applications of Linear IC's, TAB Books, Blue Ridge Summit, Pa., 2nd printing, Jan. 1976, pp. 218-219.

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