Speed detector and indicator for DC motors

Details Speed detector and indicator for DC motors Speed detector and indicator for DC motors

1974-10-15

1976-03-02

Smith, Alfred E.

Electricity: measuring and testing

Electrical speed measuring

Including motor current or voltage sensor

246182R, 318317, G01P 346

Patent

active

039421147

ABSTRACT:
A speed detector for a direct current motor is coupled substantially in parallel with the motor such that only the motor input voltage and a function of the input current are inputs to the speed detector/indicator system. Analog speed detection is provided by using either operational amplifiers or single stage transistor circuits to sample the current and voltage to generate a voltage proportional to speed of the motor.

REFERENCES:
patent: 3652937 (1972-03-01), Garrott
henry G. and Patlach A., "Motor Tachometer Circuit", IBM Technical Disclosure Bulletin, Vol. 14, No. 7, Dec. 1971, pp. 1986-1987.
Butterworth H., "Speed Control for D.C. Model Motors", Wireless World, Sept. 1967, pp. 440-442.

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