Fe-Al合金を用いた磁歪式トルクセンサ

概要

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The needs of accurate torque control of motors and engines have acceralated the development of various types of torque sensors. We investigated solenoid type magnetostrictive torque sensor with grooved shafts made of Fe-Al alloys. Sensor output characteristics (sensitivity and hysteresis) were measured by changing Al content and heat treatment (cooling rate) of the shafts.Maximum sensitivity and zero hysteresis were obtained at around 13wt% Al content when the shafts were oil quenched. With increasing the cooling rate of the shaft, linear sensor output was obtained, and the hysteresis became small on all the samples tested.The calculation of sensor sensitivity was made assuming the rotation magnetization, which showed agreement with the experimental value.Relationship between the hysteresis and the magnetic properties (Br) was observed although the origin of the hysteresis of the sensor output is not clear.