论文部分内容阅读
近年来,可控硅无触点开关在一些矿山开始应用,可是由于其保护环节还不够完善,售价又较昂贵,至今还没有广泛普及。目前,大部分矿山还是采用交流接触器,它是电动机合闸与切断电路所不可缺少的电气装置。CJ1系列交流接触器的电磁吸引线圈(图1),按规定是采用交流电源。交流电是按正弦曲线变化的,因此磁通也做周期性的变化。当电流经过零时,即磁通量(磁力线)为零值时,可能引起衔铁的振动,发出
In recent years, SCR non-contact switch in some mines began to apply, but because of its protection is not yet perfect, the price is more expensive, so far there is no widespread. At present, most of the mines still use AC contactor, which is an indispensable electrical device for closing and cutting off the motor. CJ1 series AC contactor electromagnetic coil (Figure 1), according to the provisions of the use of AC power. The alternating current is sinusoidal, so the flux also changes periodically. When the current through zero, the magnetic flux (magnetic line) is zero, the armature may cause vibration, issued