Systems and methods for reducing rotation noise in a magnetoelastic device and measuring torque, speed, and orientation
First Claim
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1. A method for manufacturing a magnetoelastic torque sensing device, the method comprising the steps of:
- positioning a solenoid formed around a permanently magnetized core in proximity to a magnetoelastic element;
rotating the magnetoelastic element about a central axis whereby an initial magnetically conditioned region is formed at a first location on the magnetoelastic element;
measuring magnetic fields produced by various portions of the initial magnetically conditioned region;
calculating one or more adjustment factors based on the measured magnetic fields wherein the adjustment factors comprise an offset angle; and
rotating the magnetoelastic element about the central axis while applying an electrical current to the solenoid whereby a final magnetically conditioned region is formed at the first location on the magnetoelastic element, wherein the electrical current that is applied is adjusted based on the adjustment factors during the rotation of the magnetoelastic element.
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Abstract
A system and method for creating one or more magnetically conditioned regions on a rotatable shaft or disk-shaped torque sensing element, wherein rotation noise produced by the element due to magnetic field variations is substantially negated, and a system and method for creating one or more magnetically conditioned regions on a rotatable shaft or disk-shaped element to allow the element to function as part of a rotational speed or rotational position sensing device.
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Citations
21 Claims
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1. A method for manufacturing a magnetoelastic torque sensing device, the method comprising the steps of:
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positioning a solenoid formed around a permanently magnetized core in proximity to a magnetoelastic element; rotating the magnetoelastic element about a central axis whereby an initial magnetically conditioned region is formed at a first location on the magnetoelastic element; measuring magnetic fields produced by various portions of the initial magnetically conditioned region; calculating one or more adjustment factors based on the measured magnetic fields wherein the adjustment factors comprise an offset angle; and rotating the magnetoelastic element about the central axis while applying an electrical current to the solenoid whereby a final magnetically conditioned region is formed at the first location on the magnetoelastic element, wherein the electrical current that is applied is adjusted based on the adjustment factors during the rotation of the magnetoelastic element. - View Dependent Claims (2, 3, 4, 5)
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6. A system for manufacturing a magnetoelastic torque sensing device, the system comprising:
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a permanently magnetized core configured to be positioned in proximity to a magnetoelastic element; a solenoid comprising a coil formed around the permanently magnetized core; a magnetic field sensor configured to sense a magnetic field produced by the magnetoelastic element; and a computer for controlling an electrical current applied to the solenoid based on information received from the magnetic field sensor, and based on one or more adjustment factors, wherein the adjustment factors comprise an offset angle. - View Dependent Claims (7, 8, 9)
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10. A method for manufacturing a magnetoelastic torque sensing device, the method comprising the steps of:
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positioning a magnetic field source in proximity to a magnetoelastic element such that the magnetic field source is capable of forming a magnetically conditioned region on the magnetoelastic element, wherein the magnetic field source includes a permanently magnetized core having a solenoid disposed therearound; positioning a magnetic field sensor in proximity to the magnetoelastic element such that the magnetic field sensor is capable of measuring magnetic fields produced by various portions of the magnetically conditioned region; rotating the magnetoelastic element about an axis; measuring magnetic fields produced by the various portions of a magnetically conditioned region on the magnetoelastic element; calculating one or more adjustment factors based on the measured magnetic fields, wherein the adjustment factors comprise an offset angle; and adjusting the magnetic field source based on the calculated adjustment factors by at least applying an electrical current to the solenoid and adjusting the value of the electrical current based on the adjustment factors to form the magnetically conditioned region on the magnetoelastic element. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A system comprising:
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a disk-shaped or shaft-shaped magnetoelastic torque sensing member adapted for being rotated about a central axis and for receiving a magnetically conditioned region at a radially- extending first location on the disk-shaped member or an axially-extending first location on the shaft-shaped member; a permanently magnetized core configured to be positioned in proximity to the first location; a solenoid comprising a coil formed around the permanently magnetized core for use in magnetizing the magnetically conditioned region at the first location; a magnetic field sensor configured to sense a magnetic field produced by the magnetically conditioned region; and a software subsystem comprising at least one memory device storing a software and at least one processor adapted to executing the software for providing instructions to control an electrical current applied to the solenoid based on information received by the software subsystem from the magnetic field sensor and one or more adjustment factors, wherein the adjustment factors comprise an offset angle measured relative to the central axis of the member. - View Dependent Claims (19, 20, 21)
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Specification