G - Physics
05
B
341/88
G05B 11/26 (2006.01) G01P 3/42 (2006.01) H02P 23/00 (2006.01)
Patent
CA 1116269
PHN 8914 ABSTRACT: A tachometer system for supplying a control sig- nal which is indicative of positional and/or speed errors of a rotatable element. The tachometer system comprises a tachometer on which marks are arranged in a closed track, which in cooperation with a detector produce n tacho-pulses per revolution of the tachometer, The tacho- meter system furthermore comprises a memory devise with n locations, in which n correction signals are stored. The correction signals are obtained by driving the tachometer with an accurately constant speed, then 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 measure, yielding a correction in respect of the deviations in these phase- error signals owing to positional tolerances of the marks on the tachometer. -36-
313788
Immink Kornelis A.
Van Dam Rudolf A.a.f.
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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