533 鉄基FeGa(Galfenol)系磁歪材料を用いたリング式非接触トルクセンサシステムとその特性(複合機能化材料・デバイスとその加工プロセス2)

概要

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A torque sensing system by using a magnetostrictive ring of Fe-Ga (Galfenol) alloy was developed and magnetic flux leakage from the surface of a ring attached on the rotating shaft was experimentally measured. The ring material is the new Galfenol system (FeGaAlC) alloy with higher strength and ductility The influence of alloy compositions (SK-105 carbon steel, FeGaAlC alloy), rotations speed (250〜1000rpm) on the sensitivity of pick-up voltage from Hall sensor was discussed. As a result , the sensitivity in FeGaAl-C alloy increased by about six times at rotations speed 500rpm in comparison with SK-105, and an almost linear relationship between pick-up voltage and applied toque value was obtained. In the case of the rings made by a centrifugal casting process, the sensitivity is investigated in comparison with other samples.
2007-11-16