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Galfenol-based Sensor/Actuator Devices for Smart by-Wire Steering System for Automobile Technology

Published online by Cambridge University Press:  31 January 2011

Yasubumi Furuya ,
Chihiro Saito ,
Teiko Okazaki ,
Kazumi Okada ,
Yusuke Sado ,
Takeo Chinen ,
Naoki Ogasawara  and
Muneaki Shimada
Yasubumi Furuya
Affiliation:
[email protected], Hirosaki University, Intelligent machines and System Engineering, 3 Bunkyo-cho, Hirosaki, 036-8561, Japan, +81-172-39-3677, +81-172-39-3513
Chihiro Saito
Affiliation:
[email protected], Namiki Precision Jewel Co.,Ltd, NJC Research Center, Tokyo, Japan
Teiko Okazaki
Affiliation:
[email protected], Hirosaki University, Advanced Physics, Hirosaki, Japan
Kazumi Okada
Affiliation:
[email protected], Hirosaki University, Graduate School, Hirosaki, Japan
Yusuke Sado
Affiliation:
[email protected], Hirosaki University, Graduate School, Hirosaki, Japan
Takeo Chinen
Affiliation:
[email protected], Hirosaki University, Graduate School, Hirosaki, Japan
Naoki Ogasawara
Affiliation:
[email protected], Hirosaki University, Graduate School, Hirosaki, Japan
Muneaki Shimada
Affiliation:
[email protected], NISSAN Motor Co.Ltd, Technical Research Institute, Yokosuka, Japan
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Abstract

Polycrystalline Galfenol (Fe-Ga-X, X=Al, C, Zr etc.) alloys were fabricated as a bulk sample from ark-melted and annealing process method for enhancing various engineering applicability. (Fe-Ga0.15-Al0.05)99.0-Zr0.5-C0.5 [at.%] sample showed a maximum magnetostriction of 134 ppm as well as a tensile stress over σ=800MPa. This large magnetostriction is caused by A2 phases without the excessive precipitation of ordered phases such as fcc ordered L12 and bcc ordered D03 phases. Secondarily, we will introduce an application as a smart torque sensor by utilizing Galfenol-ring around the steering shaft for steering-by-wire system of automobile. In this system, a torque sensing system by using the magnetostrictive ring of FeGa (Galfenol) alloy was developed and magnetic flux leaked from the Galfenol ring attached on the rotating shaft was experimentally measured by using two differential Hall probe sensor. As a result, the sensitivity in (Fe0.80Ga0.15Al0.05)99Zr0.5C0.5 ring increased by 2.9 times in comparison with the (Fe0.80Ga0.15Al0.05)98.5C1.5 alloy at rotations speed 500 rpm.

Keywords

sensormagnetic propertiesferromagnetic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1200: Symposium G – Magnetic Shape Memory Alloys , 2009 , 1200-G10-06
Copyright
Copyright © Materials Research Society 2010

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