Magnetic rotary encoder system having a multi-element magnetoresistive sensor
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United States of America Patent
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Sep 12, 1989
Grant Date -
N/A
app pub date -
Nov 4, 1987
filing date -
Nov 4, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A magnetic rotary encoder system includes a magnetoresistive sensor having a magnetoresistive element array which is selectively connected to accommodate a number of different diameter encoder wheels each wheel of which contains a different number of pieces of magnetic information recorded at corresponding different wavelengths. A sensing and conditioning circuit is coupled to the magnetoresistive sensor and detects changes in resistance of the magnetoresistive elements when a magnetic field produced by a magnetic pole causes the magnetoresistive resistance to drop. Output signals are provided in quadrature to increase the resolution of the system.
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