Motor speed control

Details Motor speed control Motor speed control

1987-12-09

1989-03-21

Ro, Bentsu

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318310, 318326, H02P 500

Patent

active

048146790

ABSTRACT:
A motor speed control applicable to an optical disk device and others includes a frequency converter for digitally comparing the frequency of a target speed signal and that of an actual speed signal. The outputs of the frequency converter are individually applied to frequency-to-voltage converters one of which is associated with the target speed and the other with the actual speed.

REFERENCES:
patent: 3543112 (1970-11-01), Richmond
patent: 3952236 (1976-04-01), Hoover
patent: 4254368 (1981-03-01), Ido et al.
patent: 4543516 (1985-09-01), Korobi et al.
patent: 4668900 (1987-05-01), Tabuchi
patent: 4739230 (1988-04-01), Sonobe et al.

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