Rotor position indicator with correction for apparant accelerati

Details Rotor position indicator with correction for apparant accelerati Rotor position indicator with correction for apparant accelerati

1987-04-08

1989-03-21

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

324225, 123416, G01B 714, G01N 2772, G01R 3300, F02P 500

Patent

active

048147044

ABSTRACT:
In one aspect of the present invention, an angle measuring device is described for measuring the angle of a rotating rotor having a plurality of markings spaced thereabout. The device comprises: a sensor positioned adjacent the rotor for detecting the markings and generating a sensor signal in response thereto; an indicator device, responsive to the sensor signal, for generating a position signal indicative of the angular position of the rotor. Additionally, a timing circuit is used for measuring the time between contiguous sensor signals; and a comparator is used for comparing at least one of the measured times against at least one predetermined value and for generating a comparison output signal indicative thereof. Finally, a correction circuit is used, in response to the comparison output signal, for correcting the position signal to avoid inaccuracies due to such problems as unequal spacing between the markings.

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