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:
Jun. 14, 2005
Filed:
Sep. 11, 2001
Lutz Axel May, Gelting, DE;
Lutz Axel May, Gelting, DE;
Abas, Incorporated, Chicago, IL (US);
Abstract
A shaft () subject to torque about its axis (A—A) has an axial bore (). A region () of the shaft () has a stored magnetisation, the region () being permanently magnetised with circumferential magnetisation about the axis (A—A) or an annulus of longitudinal magnetisation which is preferred. The stored magnetisation emanates a torque-dependent field into the bore (). A magnetic field sensor arrangement () is positioned in the bore to produce a torque-dependent signal. The disclosure discusses the relationship between the radial depth (t) of the permanent magnetisation in region () relative to the shaft wall thickness (t). Magnetic sensor placements include axial () or offset arrangements of pairs of sensors (). Dependent on the nature of the field to be sensed, sensors () may be oriented axially, radially or tagentially with respect to the axis (A—A).