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:
May. 22, 2012
Filed:
Feb. 26, 2009
Magnestostrictive torque sensor and manufacturing method thereof, and electric power steering system
Takuya Yamamura, Tochigi, JP;
Yuichi Fukuda, Tochigi, JP;
Nobuhiko Yoshimoto, Tochigi, JP;
Yukiya Kashimura, Tochigi, JP;
Takuya Yamamura, Tochigi, JP;
Yuichi Fukuda, Tochigi, JP;
Nobuhiko Yoshimoto, Tochigi, JP;
Yukiya Kashimura, Tochigi, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
A magnestostrictive torque sensor detects rotating torque applied to a rod-shaped rotating shaft to work around the rotating shaft based on a change in magnetic characteristics of a magnetostrictive film formed on a surface the rotating shaft so as to extend around a full circumference thereof in a circumferential direction. The magnetostrictive film is formed continuously in an axial direction at a portion on the rotating shaft in the axial direction thereof. The magnetostrictive film has on the continuously formed area a first magnetostrictive film portion and a second magnetostrictive film portion having magnetic anisotropies which are opposite to each other and a third magnetostrictive film portion which is formed between the first and second magnetostrictive film portions. A first detection coil, a second detection coil and a third detection coil are provided for the first magnetostrictive film portion, the second magnetostrictive film portion and the third magnetostrictive film portion, respectively.