交流接触器短路环的作用是减低衔铁的振动及噪声。

当接触器的线圈通电后，线圈中流通的是交变电流。由于交流电磁铁通入交流电，磁场交变，产生的吸力是脉动的，特别是交流电流过零时，磁场消失，这会引起衔铁振动。

                         1-动铁心  2-静铁心  3-线圈  4-短路环

短路环是嵌装在铁心某一端的铜环（见上图），加入短路环后，由于在短路环中产生的感应电流，阻碍了穿过它的磁通变化，使磁极的两部分磁通之间出现相位差，因而两部分磁通所产生的吸力不会同时过零，即一部分磁通产生的瞬时力为零时，另一部分磁通产生的瞬时力不会是零，其合力始终不会有零值出现。简而言之，交变电流过零时，维持动静铁芯之间具有一定的吸力，以清除动、静铁芯之间的振动，这样就达到减少振动及噪声的目的。

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