Shaft rotation monitoring apparatus

Details Shaft rotation monitoring apparatus Shaft rotation monitoring apparatus

1990-06-25

1992-04-07

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

361 51, 324160, 324166, 324175, G08B 2100

Patent

active

051032139

ABSTRACT:
A photo-optical coupler is connected to a shaft to provide a series of electronic pulses at a frequency corresponding to rotational velocity of the shaft. Apparatus electronics is responsive to frequency of such pulses for indicating a low speed alarm condition when such frequency is below a preselected threshold. The apparatus electronics includes a digital counter that is set to a first preselected count upon occurrence of each of the shaft rotation pulses, and which is thereafter decremented between the shaft rotation pulses. A low speed alarm condition is indicated if the counter reaches a count of zero prior to a succeeding shaft rotation pulse. In the preferred embodiment, the counter is decremented by an oscillator having a clock frequency coordinated with the first preselected count so as to activate the alarm when rotational velocity of the shaft decreases to a predetermined threshold percentage of a nominal rotational velocity of the shaft.

REFERENCES:
patent: 3264496 (1966-08-01), Scholl
patent: 3636545 (1972-01-01), Boyd et al.
patent: 3739367 (1973-06-01), Fathauer
patent: 3792460 (1974-02-01), Ratz
patent: 3932812 (1976-01-01), Milligan
patent: 4090181 (1978-05-01), Ansari et al.
patent: 4195291 (1980-03-01), Burks, Jr.
patent: 4521894 (1985-06-01), Moffat
patent: 4794551 (1988-12-01), Yoshida
patent: 5031144 (1991-07-01), Persky

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