Method of reducing rotation noise in a magnetoelastic torque sensing device
AssigneeMethode Electronics, Inc.
InventorsTimothy J. Moran, Frank Ursetta
Life of this patent
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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. Upon magnetization of the torque sensing element, rotation noise produced by the magnetically conditioned region is measured. Adjustment factors are calculated based on the measured rotation noise, and the adjustment factors are used to adjust a magnetic field source during subsequent magnetization of the torque sensing element.
Claims28
A method for manufacturing a magnetoelastic torque sensing device, the method comprising the steps of:
- forming an initial magnetically conditioned region at a first location on magnetoelastic element;
- measuring magnetic fields produced by various portions of the initial magnetically conditioned region;
- calculating adjustment factors based on the measured magnetic fields;
- and
- using the calculated adjustment factors to form a final magnetically conditioned region at the first location on the magnetoelastic element.
A system for manufacturing a magnetoelastic torque sensing device, the system comprising:
- a DC magnetic field source;
- a holder configured to hold the DC magnetic field source in proximity to a magnetoelastic element;
- a magnetic field sensor configured to sense a magnetic field produced by the magnetoelastic element;
- and
- a computer system configured to control a position of the holder based on information received from the magnetic field sensor.
A system for manufacturing a magnetoelastic torque sensing device, the system comprising:
- a permanent magnet configured to be positioned in proximity to a magnetoelastic element;
- a solenoid having a central axis that is perpendicular to a magnetic orientation of the permanent magnet;
- a magnetic field sensor configured to sense a magnetic field produced by the magnetoelastic element;
- and
- a computer system configured to control an electrical current applied to the solenoid based on information received from the magnetic field sensor.
A method for manufacturing a magnetoelastic torque sensing device, the method comprising the steps of:
- positioning a DC magnetic field source in proximity to a magnetoelastic element such that the DC magnetic field source is capable of forming a magnetically conditioned region on the magnetoelastic element;
- 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 various portions of a magnetically conditioned region on the magnetoelastic element;
- calculating adjustment factors based on the measured magnetic fields;
- and
- adjusting the DC magnetic field source based on the calculated adjustment factors.
Dependencies are inferred from the claim text.