Plural rotary member position encoder having electromagnetically coupled resonant frequency multiplexed outputs for respectively associated rotatable members
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United States of America Patent
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Aug 18, 1998
Grant Date -
N/A
app pub date -
Dec 14, 1995
filing date -
May 1, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An apparatus for indicating the angular position of a rotatable member includes a drive coil with its axis corresponding to the axis of rotation of the rotatable member. A coil is wound around the rotatable member, and a capacitor is provided in the coil to form an LC resonant circuit. The coil on the rotatable member is wound so that application of an alternating magnetic field to the drive coil induces a resonance in the LC circuit which is constant for all angular positions of the rotatable member. Pick-up coils are provided such that the planes of these coils and the drive coil are orthogonal. The resonance of the LC circuit produces signals in the output coils which depend upon the angular position of the rotatable member. The signals may be processed to determine that angular position, and the processing is simplified with this arrangement of output coils since the signals produced therein are quadrature signals.
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