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直流电磁式时间继电器断电延时原理是利用楞次定律,方法有两种:
1、阻尼铜套法:当线圈通电时,衔铁处于释放位置,气隙大,磁阻大,磁通小,所以阻尼铜套的作用很小,可不计延时作用,而线圈断电时,由于电流瞬间减小,根据楞次定律阻尼铜套中将产生一个感应电流,阻碍磁通的变化,维持衔铁不立即释放,直至磁通通过阻尼铜套电阻消耗逐渐使电磁吸力不足以克服反力时,衔铁释放,从而产生了断电延时。
2、短接线圈法:当电磁线圈断电时,立即把线圈短接,根据楞次定律线圈中将产生一个阻碍磁通变化的感应电流,维持衔铁不立即释放,从而产生断电延时。
延时范围的调整:
(1)改变释放弹簧的松紧度:释放弹簧越紧,释放磁通越大,延时越短。
(2)改变非磁性垫片厚度:垫片厚度增加,延时增加。
(3)为增大断电延时,对带阻尼套的时间继电器可兼用短接线圈法。
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