由于交流电磁铁的电磁吸力是脉动的，即当电磁吸力小于作用在动铁芯上的弹簧力时.动铁芯将从静铁芯闭合处被拉开使铁芯释放;而当电磁吸力大于弹簧时，动铁芯又被吸合。所以，电源电压变化一个周期，电磁铁吸合两次，

对于频率为50Hz的交流电源来讲，在1s内电磁铁可吸合100次从而使动铁芯剧烈振动井产生噪声、亦会使钊触处产生靡损，降低电磁铁使用寿命口因此，必须采取有效措施消除动铁芯的振动。办法是在电磁铁铁芯的端而上开一个小槽，在槽内嵌人铜质短路环。

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