Abstract

Torque was detected in a steel shaft with a ring-shaped surface by using a magneto-impedance effect sensor. The hysteresis of torque detection was removed by summing the output of two magmeto-impedance effect sensors whose heads were placed on the two edges of a gutter in the ring-shaped surface. The hysteresis removal was done utilizing two different shapes of the hysteresis of torque detection at the two edges. A large pulse current was a priori applied through the shaft to induce circumferential magnetic anisotropy in order to remove the magnetic poles at the gutter edge for zero torque.

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