Device including magnet-biased magnetoresistive sensor and rotatable, magnetized encoder for detecting rotary movements
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United States of America Patent
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Dec 7, 1999
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N/A
app pub date -
Aug 26, 1996
filing date -
Dec 22, 1993
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Abstract
A device for detecting rotary movements includes a measuring data emitter that co-rotates with the part performing the rotary movement, and a stationary transducer which includes a magneto-resistive sensor element with a bias magnet. The measuring data emitter is an encoder having successive permanent magnet areas of alternating polarity in the direction of rotation (Y direction). The sensor element is arranged and the bias magnet is magnetized in such a way that, during rotary movement, in a preferred direction of the sensor element (Y direction) which is orthogonal to the magnetic field component (X direction) produced by the bias magnet, the magnetized areas cause a variable magnetic field component between the adjacent permanent magnet areas which is representative of the rotary movement and passes through the magneto-resistive sensor element in the Y direction.
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