SYSTEM AND METHOD FOR DETECTING MAGNETIC NOISE BY APPLYING A SWITCHING FUNCTION TO MAGNETIC FIELD SENSING COILS
First Claim
1. A torque sensing device comprising:
- a magnetoelastic torque to magnetic field transducer having a first magnetically conditioned region and a second, oppositely polarized magnetically conditioned region;
a first magnetic field sensing device positioned proximate to the first magnetically conditioned region;
a second magnetic field sensing device positioned proximate to the second magnetically conditioned region; and
means for switching between a first electrical connection state and a second electrical connection state,wherein, in the first connection state, the first magnetic field sensing device and the second magnetic field sensing device are oppositely polarized, and wherein, in the second connection state, the first magnetic field sensing device and the second magnetic field sensing device are polarized in the same direction.
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Abstract
A torque sensing device for measuring the torque applied to a rotatable shaft, and also measuring the magnetic field noise affecting the device. The device incorporates a switching function thereby enabling the device to operate in a common signal detection mode and a differential noise detection mode. The device is capable of determining the torque applied to the rotatable shaft based upon output signals obtained from magnetic field sensors operating in both the common signal detection mode and the differential noise detection mode. The device is capable of accurately measuring a torque induced magnetic field and is capable of canceling measurement error resulting from noise induced magnetic fields.
25 Citations
20 Claims
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1. A torque sensing device comprising:
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a magnetoelastic torque to magnetic field transducer having a first magnetically conditioned region and a second, oppositely polarized magnetically conditioned region; a first magnetic field sensing device positioned proximate to the first magnetically conditioned region; a second magnetic field sensing device positioned proximate to the second magnetically conditioned region; and means for switching between a first electrical connection state and a second electrical connection state, wherein, in the first connection state, the first magnetic field sensing device and the second magnetic field sensing device are oppositely polarized, and wherein, in the second connection state, the first magnetic field sensing device and the second magnetic field sensing device are polarized in the same direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for determining the amount of torque applied to a torque sensing device comprising the steps of:
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providing a magnetoelastic torque to magnetic field transducer having a first magnetically conditioned region and a second, oppositely polarized magnetically conditioned region; providing a first magnetic field sensor positioned proximate to the first magnetically conditioned region, the first magnetic field sensor having a sensitive direction; providing a second magnetic field sensor positioned proximate to the second magnetically conditioned region, the second magnetic field sensor having a sensitive direction; configuring the first and second magnetic field sensors in a first connection state wherein the sensitive directions of the first and second magnetic field sensors are opposite one another; obtaining a first output signal from each of the first and second magnetic field sensors in the first connection state; causing a switching function to reconfigure first and second magnetic field sensors in a second connection state wherein the sensitive directions of the first and second magnetic field sensors are identical; obtaining a second output signal from each of the first and second magnetic field sensors in the second connection state; and calculating the torque applied to the torque sensing device based on the first and second output signals.
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Specification