关键词: 传感器, 纳米晶软磁合金, 多功能, 转矩, 转速, 转角

Abstract:

To improve the versatility of sensor, a new non-contact sensor to measure angle, rotational speed and torque at the same time was discussed. First, the structure and principle based on magneto-elastic effect of nanocrystalline soft magnetic alloy were presented. Second its output mathematical model and sensitivity formula were derived. Finally a measuring experiment was made at 25~100℃ temperature range , 0～450N·m torque range and 500～3525r/min rotational speed range. The testing results are that the sensor's temperature drift is as 0.002 03% F.S/℃ for 25℃, its maximum linearity 0.81% F.S, repeatability error 0.50% F.S, hysteresis error 0.85% F.S and rotational speed maximum relative error 0.70%. The experimental results also show the sensor's sensitivity is as 1.26mV/N·m and measurement precision is as 1.0%, so it can be used for general engineering applications.

Key words: sensor, nanocrystalline soft magnetic alloy, multifunction;torque, rotational speed, angular displacement