Magnetoelastic torque sensor with ambient field rejection
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United States of America Patent
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Jan 3, 2012
Grant Date -
Sep 17, 2009
app pub date -
Mar 13, 2009
filing date -
Mar 14, 2008
priority date (Note) -
Expired
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Abstract
The present invention involves a method and apparatus for canceling the effects of magnetic field noise in a torque sensor by placing three sets of magnetic field sensors around a shaft, the first set of field sensors being placed in the central region of the shaft and the second and third sets of field sensors being placed on the right side and left side of the field sensors placed at the central region, respectively. A torque-induced magnetic field is not cancelled with this arrangement of field sensors but a magnetic near field from a near field source is cancelled.
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