电感式接近开关工作原理

■ 工作原理

   Working principle of inductive proximity switch

  物体       LC振荡器        开关级         放大输出级

Object 　LC oscillator　switching stage　magnified output stage

由三大部分组成:

振荡器、开关电路及放大输出电路。振荡器产生一个交变磁场。当金属物体 接近这一磁场，

并达到感应距离时，在金属物体内产生涡流，从而导致振荡衰减，以 至停振。

振荡器振荡及停振的变化被后级放大电路处理并转换成开磁信号，触发驱动控制器件，从而

达到非接触式这检测目的。

物体离越近，线圈内的阻尼就越大，阻尼越大，振荡器的电流越小。

Inductive proximity switch is composed of three parts: oscillator, switch

circuit and magnified output circuit. The oscillator will generate an

alternating electric field. When themetal object approaches this electric

field and reaches the induction distance, whirlpool will generate in metal

object, resulting in attenuation of vibrati on and then stop. The changeof

vibration and stop of oscillator is treated by behind stage magnified circuit and