F0401(1) 自動車ステアバイワイヤー化への磁歪合金トルクセンサーの開発([F0401]エネルギー維新と知的材料システム,先端技術フォーラム)

概要

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Polycrystalline Galfenol (Fe-Ga-X, X=Al, C, Mo, etc.) alloys were fabricated as a bulk sample by ark-melting or as an ribbon samples by rapid-solidification melt-spinning method. Their metallurgical characterization, the magnetic characteristic and strength property after appropriate heat-treatments were studied. As one example, FeGa-Al-C arc melted and following annealed sample showed a maximum magnetostriction over λmax=100ppm as well as a high tensile stress σ=800MPa level.. Based on this result, we will introduce an application as a torque sensor for steering-by-wire system of automobile because this Galfenol alloy with large magnetostriction also has high strength and workability for torque-ring around the steering shafts.
2009-09-12