Tachometer

Details Tachometer Tachometer

1983-03-08

1985-11-12

Krawczewicz, Stanley T.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324154R, 324166, G01P 348, G01P 354

Patent

active

045530939

ABSTRACT:
A detection signal of a frequency corresponding to a rotational frequency is applied to a frequency-voltage converter and its converted voltage signal is provided to a sine-cosine current generator, from which sine-wave and cosine-wave currents having sine and cosine values corresponding to the voltage value of the voltage signal are supplied to a cross-coil rotary magnet type indicator for providing an indication of the rotational frequency by a pointer. When the power source is cut off, interruption of the power source voltage supply to the frequency-voltage converter and the sine-cosine current generator is delayed by delay means and, in the delay time, the input to the sine-cosine current generator is reduced, returning the pointer to the zero point. The indicator further includes a zero-resetting magnet which interacts with the rotary magnet to force the pointer to move to said zero point.

REFERENCES:
patent: 4291268 (1981-09-01), Okuyama
Buckwalter, Knight-Kit Tachometer, Radio Electronics, Feb. 1962, pp. 42 and 43.

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