Apparatus for magnetically detecting position or speed or moving body utilizing bridge circuit with series connected MR elements
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United States of America Patent
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Apr 4, 1989
Grant Date -
N/A
app pub date -
Feb 26, 1987
filing date -
Mar 5, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Magnetic poles are provided continuously with a pitch .lambda. on the peripheral portion of a drum rotated in accordance with a movement of a moving body. A magnetic sensor is provided in opposition to these poles. The sensor is formed of two magnetoresistive element pairs which are spaced from each other at .lambda./6, and the two elements in each pair are arranged in positions spaced from each other at .lambda./2. The two elements in each pair are connected in series to form a bridge circuit. The signals obtained from the nodes of the series-connected elements in the two element pairs are differentially amplified so that third harmonic wave components are eliminated, and a signal having no distortion and representative of the position or speed of the moving body can be obtained.
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