Patent · US Expired

Torque sensing apparatus

US7225686B2 · kind B2 · utility

0Cited by

6References

13Claims

0Family size

Assignee

TDK CORPORATION · JP

Inventors

Teruo Mori · Tokyo, JP
Toshihiro Suzuki
Shiro Tomizawa · Tokyo, JP
Kesaharu Takatoh · Tokyo, JP

Key dates

Filing date	Mar 3, 2005
Grant date	Jun 5, 2007
Priority date	—
Expiry date	Jul 20, 2025

Classification

Technology area (CPC G)Physics
CPC primaryG01L3/102
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A torque sensor includes a substantially tubular giant magnetostrictive member, a shaft passing through the inner bore of the giant magnetostrictive member and capable of transmitting torque to the giant magnetostrictive member, and a detection coil for detecting changes in the magnetic permeability or remnant magnetization of the giant magnetostrictive member. Torque changes of the shaft are detected as changes in the magnetic permeability or remnant magnetization of the giant magnetostrictive member, based on the deformation of the giant magnetostrictive member. The torque sensor enables a reduction in the number of components and costs, as well as detection of torque changes with high sensitivity.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.