The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 11, 2003
Filed:
Nov. 10, 1999
Carl Gandarillas, Beacon Falls, CT (US);
Siemens VDO Automotive Corporation, Auburn Hills, MI (US);
Abstract
A low-hysteresis torque sensor and method for producing a low-hysteresis magnetoelastic element including thermally spraying a magnetoelastic material onto a metal substrate. During the spraying process, axial compressive pressure is applied to the substrate, and subsequently released after the substrate and magnetoelastic element have substantially cooled. This process has the effect of substantially reducing hysteresis and the axial stress in the magnetoelastic element that would normally occur due to the different coefficients of thermal expansion between the magnetoelastic element and the substrate. In a preferred embodiment, the magnetoelastic element includes nickel and the substrate includes stainless steel. It is further preferred that the substrate include a shaft and the magnetoelastic element comprise a circumferential ring intimately attached thereto.