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:
Mar. 09, 2004
Filed:
Jun. 13, 2002
Christer Wallin, Västerås, SE;
Hans Ling, Spánga, SE;
Lars Hassel, Västerås, SE;
ABB AB, Vasteras, SE;
Abstract
The present invention relates to a magnetostrictive sensor for measuring a torque in a shaft. The sensor comprises at least one active magnetostrictive region on the shaft, a surface pattern in the magnetostrictive region such that it obtains anisotropic properties, a first means arranged to generate a magnetic field varying in time in the magnetostrictive region and a second means arranged to sense variation in the permeability in the magnetostrictive region. Said magnetostrictive region comprises a first layer of a magnetostrictive material which is provided on the surface of the shaft and that said surface pattern is formed by a second layer of a non-magnetostrictive material comprising a low resistivity.