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一、引言本转速表系应用新型磁敏元件——强磁性金属薄膜磁敏电阻,利用其对磁场强度十分敏感的特点设计而成的转速测试仪,由于它的最大优点是采用非接触方式测量旋转物体的转速,因此它不受被测物启动力矩大小和被测物表面摩擦系数大小的影响,即不用考虑传感头和旋转体间摩擦力大小以及是否有滑动情况,避免了丢转。较之接触式转速表,其测量精度得到了提高。又由于磁敏电
I. Introduction The tachometer system uses a new type of magnetic sensor - ferromagnetic metal thin film magnetoresistive sensor, using its magnetic field strength is very sensitive to the design of the speed tester, because of its biggest advantage is the use of non-contact measurement Therefore, it is not affected by the magnitude of the starting torque of the measured object and the friction coefficient of the surface of the measured object, that is, it does not need to consider the magnitude of the friction between the sensing head and the rotating body and whether there is a sliding condition to avoid losing the rotation. Compared with the contact tachometer, its measurement accuracy has been improved. And because of magnetostriction