Motor speed indicator

Details Motor speed indicator Motor speed indicator

1974-03-20

1976-01-13

Smith, Alfred E.

Electricity: measuring and testing

Electrical speed measuring

Speed comparing means

324 78Q, G01P 356

Patent

active

039328120

ABSTRACT:
Apparatus for indicating when a change has taken place in a desired operating condition of a device using retriggerable multivibrators which are adjusted to represent particular periods with respect to the desired operating rate of the device. In the case of a motor, the multivibrators indicate when the motor is operating at, below or above a desired operating speed.

REFERENCES:
patent: 3146432 (1964-08-01), Johnson
patent: 3585400 (1971-06-01), Brayton
patent: 3719888 (1973-03-01), Sampey
patent: 3739367 (1973-06-01), Fathauer
E. M. Dumstorff et al, Digital Speed Checking Circuit, IBM Tech. Discl. Bull., 15(12), May, 1973, pp. 1223.

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