MAGNETOSTRICTIVE TORQUE DETECTOR AND MAGNETOSTRICTIVE TORQUE SENSOR

摘要

PROBLEM TO BE SOLVED: To reduce the detection error resulted from a temperature change in a signal processing unit for generating a DC detection signal from the AC output of each detecting coil. SOLUTION: A pair of detecting coils 20A and 20B of a magnetostrictive torque sensor 10 is serially connected with reverse polarities to use both ends thereof as output ends for outputting the differential output of the AC output induced in each of the detecting coils 20A and 20B. Both the detecting coils 20A and 20B are provided with a difference in number of turns so that the magnitude of the differential AC shows a linear output characteristic in the detecting range of load torque when a load torque is added in the detecting range within a maximum detected load torque set every rotating direction to a shaft S.