Abstract
A single-structured torque sensor using a magnetostrictive ring attached to the steering shaft of the steering-by-wire system of an automobile was developed. An (Fe0.80Ga0.15Al0.05)99Zr0.5C0.5 alloy, which exhibited the large magnetostriction of 134ppm and the strong tensile stress of over 800MPa, was used for the magnetostrictive torque ring. However, the sensitivity of the torque ring sensor was 0.12 © 10 ¹4 TN ¹1 m ¹1 , which is smaller than the 0.8 © 10 ¹4 TN ¹1 m ¹1 needed for a steering-by-wire system. The ring was therefore heattreated at 743K under a compressed stress of 100MPa via the spark plasma sintering method to increase the sensitivity of torque. As a result, the sensitivity of the torque ring sensor increased to 0.72 © 10 ¹4 TN ¹1 m ¹1 although depending on the residual magnetic flux density.
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