Table of Contents
ISRN Electronics
Volume 2012 (2012), Article ID 738597, 8 pages
Research Article

Proposal and Performance Evaluation of a Magneto-Striction Type Torque Sensor Consisting of Small-Sized Coils Connected in Series

1Information Media Center, Tokyo University of Agriculture and Technology, Tokyo, Japan
2Azuma Systems Corporation, Kumagaya, Japan

Received 25 June 2012; Accepted 5 August 2012

Academic Editors: H. J. De Los Santos and J. Zhang

Copyright © 2012 Takahiko Tsujisawa and Kazuhiro Yamakawa. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We propose a sensor consisting of small-sized coils connected in series and a detection method for the sensor based on the iteration of the periodic time difference. The evaluation results are also presented and show the effectiveness of the proposed system. The target performance of the sensor is as follows: (i) a detection range from 0 to ±100 Nm, (ii) a hysteresis error of less than 1%, (iii) an angular-dependent noise of less than 2%, and (iv) a sensor drift of less than 2%. From the evaluation results, it is clear that these performance targets, as well as a sufficient response time, are realized.