Tachometer system

Details Tachometer system Tachometer system

1978-03-03

1980-08-05

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318314, 318318, H02P 540

Patent

active

042164192

ABSTRACT:
A tachometer system for supplying a control signal indicative of positional and/or speed errors of a rotatable element comprises a tachometer on which marks are arranged in a closed track and a detector responsive thereto to produce n tacho-pulses per revolution of the tachometer. The tachometer system further comprises a memory device with n locations in which n correction signals are stored. The correction signals are obtained by driving the tachometer at an accurately constant speed, measuring the phase difference between the tacho-pulses and the reference signal, and storing the phase-error signals related to the consecutive tacho-pulses in separate locations of the memory device. When the tachometer system is used in a servo control loop these correction signals are used to correct the phase-error signals then measured, yielding a correction in respect of the deviations in these phase-error signals owing to positional tolerances of the marks on the tachometer.

REFERENCES:
patent: 3648141 (1972-03-01), Scheer
patent: 3737751 (1973-06-01), Lima
patent: 3820893 (1974-06-01), Donohue et al.
patent: 3836833 (1914-09-01), Harris et al.
patent: 3845370 (1974-10-01), Mantey
patent: 4042863 (1977-08-01), von de Heide

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