G - Physics
08
C
340/135.6
G08C 21/00 (2006.01) G01D 5/14 (2006.01) G01D 11/24 (2006.01)
Patent
CA 1232957
ABSTRACT OF THE DISCLOSURE A novel sensor or transducer is provided herein. The sensor is an angle sensor which may be used to achieve spatially correspondent master/slave controls. The sensor includes an inner ring of robust, non- magnetic material within which is fixedly disposed, but preferably is em- bedded, at least one Hall-effect plate ; an outer ring of robust non- magnetic material relatively rotatable with respect to the inner ring, the outer ring having fixed therein, but preferably embedded therein , at least two magnet poles to provide a uniform magnetic field in the inner ring ; and a casing around the outer ring, the casing being formed of a ferromagnetic metal. Electrical connections are provided for the Hall- effect plate for applying a current along the length thereof and for conducting the voltage therefrom which has been produced across the Hall- effect plate. Means are provided for relatively rotating the inner and outer rings. Finally means are provided for reading the voltage which has been produced across the Hall-effect plate. This voltage varies continuously as the sine of the angle of rotation between the inner and outer rings. This sensor thus provides reliable and precise angle sensing.
464374
Borden Ladner Gervais Llp
Hewett Allan J.
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