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. 24, 2008
Filed:
Dec. 01, 2004
Song Ouyang, Tokyo, JP;
Ryoichi Menju, Tokyo, JP;
Song Ouyang, Tokyo, JP;
Ryoichi Menju, Tokyo, JP;
Hitachi Cable, Ltd., Tokyo, JP;
Abstract
A magnetostrictive torque sensor comprises a rotary shaft rotating around its center axis and having a magnetostrictive characteristic and a cylindrical ferrite magnetic core disposed at a predetermined distance from the outer periphery of the rotary shaft and coaxially with the rotary shaft and having on its inner peripheral surface a coil serving to detect the strain of the rotary shaft and having an insulating cover. The cylindrical ferrite magnetic core has a pair of opposed coil-forming inner peripheral surfaces defined by dividing the inner peripheral surface into two parts along a plane including the center axis. The coil has, on the respective opposed paired inner peripheral surfaces, a first coil including a going-current coil and a returning-current coil disposed in the same position at an angle of +45° to the center axis, adapted to flow a going current and a returning current in the same direction, and connected in series and a second coil including a going-current coil and a returning-current coil disposed in the same position at an angle of −45° to the center axis, crossing the first coil at right angles, adapted to flow a going current and a returning current in the same direction, and connected in series.