抄録
The purpose of this study is material development for non-contact torque sensor utilizing magnetostriction ring. We applied FeGa polycrystalline magnetostrictive material which has been studied by the author's grope. However, when actually using it for sensor, it becomes necessary to increase the strength more than that of the present FeGa materials. For this purpose, C element was added to FeGaAl alloy, and then magnetic property and mechanical property were investigated. (Fe-13ga-5Al)-1.5C [at.%] sample showed the value of the 50ppm of the maximum magnetostrictions and the value of 667MPa of fracture stress which seemed applicable as a torque sensor material. The torque sensor system was assembled using this alloy ring on the twisted shaft of non-ferromagnetic material and the output magnetic field was measured by ten adjacent Hall-sensor. The output of (Fe-13ga-5Al)-1.5C [at.%] ring showed the linear line mostly and sensitivity was 47.5m Oe/Nm. that is promising data for the proposed torque sensing systemn.
