1. Working principle and function of short circuit ring

交流接触器的铁心由硅钢片叠压而成，这样可以减少交变磁通在铁心中的涡流和磁滞损耗。

The iron core of AC contactor is made of silicon steel sheets, which can reduce the eddy current and hysteresis loss of alternating magnetic flux in the iron core.

在有交变电流通过电磁线圈时，线圈对衔铁的吸引力也是交变的，当交流电流通过零值时，线圈磁通变为零，对衔铁的吸引力也为零。

When an alternating current passes through the electromagnetic coil, the attraction of the coil to the armature is also alternating. When the alternating current passes through zero, the magnetic flux of the coil becomes zero and the attraction to the armature is also zero.

衔铁在复位弹簧作用下将产生释放趋势，这使动静铁心之间的吸引力随着交流电的变化而变化，从而产生变化和噪声'加速动静铁心接触产生的磨损，引起给合不良.严重时还会使触点烧蚀。

The armature will have a release trend under the action of the return spring, which makes the attraction between the dynamic and static iron cores change with the change of AC, resulting in change and noise, accelerating the wear caused by the contact between the dynamic and static iron cores and causing poor closing In severe cases, it will also cause contact ablation.

为了消除此弊端.在铁心柱端面的一部分嵌入一只铜环，名为/短路环/，该短路环相当于变压器的副边绕组，在线圈通入交流电时不仅线圈产生磁通。

In order to eliminate this disadvantage A copper ring named / short-circuit ring / is embedded in a part of the end face of the core column. The short-circuit ring is equivalent to the secondary winding of the transformer. When the coil is connected with AC, not only the coil generates magnetic flux.

交流接触器短路环

Short circuit ring of AC contactor

2、短路环中的感应电流也产生磁通

2. The induced current in the short-circuit ring also generates magnetic flux

此时短路环相当于纯电感电路，从纯电感电路的相位可知，线圈电流磁通与短路环感应电流磁通不同时为零.即电源输入的交变电流通过零值时短路环感应电流不为零。

At this time, the short-circuit loop is equivalent to a pure inductance circuit. From the phase of the pure inductance circuit, the coil current flux and the induced current flux of the short-circuit loop are not zero at the same time That is, when the alternating current input by the power supply passes through the zero value, the induced current of the short-circuit ring is not zero.

此时它的磁通对衔铁对将起着吸咐作用，从而克服了衔铁被释放的趋势.使衔铁在通电过程总是处于吸合状态，明显减少了振动噪声，所以短路环又名消振环。

At this time, its magnetic flux will attract the armature pair, thus overcoming the trend of armature being released The armature is always in the pull in state during the energization process, which significantly reduces the vibration and noise, so the short-circuit ring is also known as the vibration elimination ring.

3、材料

3. Materials

通常由康铜或镍铬合金制成。

It is usually made of constantan or nickel chromium alloy.

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