目前,国产交流接触器的机械寿命(指承受机械破坏的能力。常用无负载情况下的操作次数来表示)很低,一般只有三百万次左右,而国外同类产品的机械寿命均在一千万次以上。寿命低的原因主要是铁芯(如图)的质量差,这样接触器工作时,铁芯在承受多次吸合冲击后极面发生变形,使接触器无法工作。为了提高铁芯的质量,除采用合理的设计外,一般有两 At present, the mechanical life of the domestic AC contactor (means the ability to withstand mechanical damage. Commonly used in the case of no-load operation to indicate) is very low, usually only about three million times, and foreign similar products, mechanical life in a thousand Million or more. Low life is mainly due to the poor core (pictured), so that when the contactor work, the core withstand multiple pull after the deformation of the polar surface, so that the contactor can not work. In order to improve the quality of the iron core, in addition to using a reasonable design, there are generally two