In order to detect the piston position of cylinder and control the stroke of piston movement accurately,a contactless magnetic switch which based on the principle of magnetic resistance effect was designed . The switch turned the change of magnetic field into the change of electrical signal. The operating travel of switch was detected by a cylinder through practise. The case study shows that the operating trave of the switch is between 3 mm to 10 mm,and its reaction time is within 1 ms. And besides,it has the following advantages: contaceless, low power consumption, long operation life, convenient operation and quick response.%为准确检测气缸活塞位置,控制活塞的运动行程,以磁阻效应的原理为基础,设计了一种无触点磁性开关.该开关将磁场的变化转化为电信号的变化输出.在实例运用中,以一种气缸为对象,进行了开关的动作行程检测.实例研究表明:该开关动作范围为3～10 mm,反应时间在1 ms以下,具有无触点、寿命长、功耗低、使用方便和响应快等优点.
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