Rotation speed detecting apparatus

Details Rotation speed detecting apparatus Rotation speed detecting apparatus

1986-05-23

1988-12-27

Lall, Parshotam S.

Boots, shoes, and leggings

324166, 377 20, G01P 3489, G01P 354, G06F 1540

Patent

active

047945516

ABSTRACT:
An apparatus for detecting the rotation speed of a rotatory member such as a rotary shaft of an electric motor comprises a first counter for counting the pulses of a pulse signal of a frequency proportional to the rotation speed of the rotatory member, a presettable down-counter for counting down a predetermined value sequentially in response to clock pulses, and a CPU for reading out the count value of the first counter upon completion of prescribed count-down of the presettable down-counter and computing the rotation speed of the rotatory member on the basis of the count value thus read out. And upon termination of such computation, the CPU changes the count value of the presettable down-counter back to the predetermined value.

REFERENCES:
patent: 3757167 (1973-09-01), Yoshikawa et al.
patent: 4229695 (1980-10-01), Bassi
patent: 4281388 (1981-07-01), Friend et al.
patent: 4434470 (1984-02-01), Thomas et al.
patent: 4485452 (1984-11-01), Cording et al.
patent: 4527248 (1985-07-01), Takase et al.
patent: 4566069 (1986-01-01), Hirayama et al.
patent: 4584528 (1986-04-01), Ohmae et al.

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