An Iterative Periodic Time Difference Detection Method and Its Application to Noncontact Torque Sensors

Abstract

In this paper, a noncontact magnetostriction type torque sensor using iterative periodic time difference detection method and its application to a rotational axis torque detection are described. In order to apply the proposed method to the rotational axis, i) reduction of the sensor hysteresis due to the magnetic characteristic of materials, ii) reduction of the sensor ripple due to the characteristic difference of material surface, and iii) reduction of the sensor drift to occur by a temperature change are examined and carried out. As a result, it is shown that the sensor ripple and the sensor drift can be suppressed about 1.0 Nm (p-p) and less than 0.5 Nm, respectively.