Motor speed control system

Details Motor speed control system Motor speed control system

1986-05-30

1987-07-14

Shoop, Jr., William M.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318327, 318314, 318341, 318317, 318318, 318138, G05B 1928

Patent

active

046805168

ABSTRACT:
A motor speed control system comprises an encoder (12) which produces a series of indicator pulses related to the motor's speed. The period of the pulse is compared with that of a crystal-controlled reference period produced by a period generator (14). Comparison is made by means of a period comparator (16) consisting of logic elements, including flip-flops (F1, F2, F3) and gates (G1 and G2). Digital outputs of the period comparator control UP and DOWN charge pumps whose integrated value controls the motor through a power driver. Advantages of the system are precise digital control with crystal accuracy.

REFERENCES:
patent: 3564368 (1968-01-01), Kelling
patent: 3950682 (1976-04-01), Dohanich
patent: 4153863 (1979-05-01), Schachte et al.
patent: 4376262 (1983-03-01), Okuda et al.
patent: 4463300 (1984-07-01), Mayne et al.
patent: 4486692 (1984-12-01), Sonoda et al.
patent: 4516060 (1985-05-01), Guzik et al.
patent: 4631462 (1986-12-01), Geven

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