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STATIC TORQUE MEASUREMENT USING GMI STRAIN GAUGE

T. Uchiyama1, F. Borza1,* , T. Meydan1

Affiliation

  1. Wolfson Centre for Magnetics Technology, School of Engineering, Cardiff University, P.O. Box 925, Cardiff, CF24 0YF, UK

Abstract

Torque detection characteristics using GMI strain gauge, which is based on CoFeSiB amorphous microwires, are investigated. The gauge factor of the negative magnetostrictive wire used in this paper is higher than 2000. The linear relation between the bridge sensor output and the applied static torque is obtained in the torque range of +5 Nm for a 13 mm in diameter brass shaft. The torque sensitivity is enhanced by the bias technique while the field sensitivity is reduced. Applying simultaneously dc bias current and dc bias field, the sensitivity reaches 14 mV/Nm. Both high sensitivity and small power consumption are advantages of GMI stain gauge. Based on the results obtained in this paper, GMI strain gauges would be useful for the power steering application in the automotive industry..

Keywords

Torque detection, Strain gauge, GMI effect.

Submitted at: April 26, 2004
Accepted at: June 10, 2004

Citation

T. Uchiyama, F. Borza, T. Meydan, STATIC TORQUE MEASUREMENT USING GMI STRAIN GAUGE, Journal of Optoelectronics and Advanced Materials Vol. 6, Iss. 2, pp. 699-703 (2004)