A study of electrical contacts in which a permanent magnet is embedded to reduce contact erosion caused by arc discharges

当直流电路由安装在磁继电器上的电触点切换时，电弧放电的发生是不可避免的。如果电弧的位置位于接触面上，则继电器福尔斯会进入故障操作。为了避免这一缺陷，提出了一种新的电触头结构，即在触头中嵌入永磁体。结果表明，该结构能有效地实现直流电路中电触头的宽而均匀的烧蚀。

Occurrence of arc discharges is inevitable when the DC electrical circuit is switched by electrical contacts mounted on a magnetic relay. The relay falls into the defective operation if the position of the arcs is localized on contact surfaces. A new structure of the electrical contacts in which the permanent magnet was embedded was proposed in order to avoid the defect. As results, it is proved that the new structure was effective to achieve the wide and uniform erosion of electrical contacts used in the DC circuit.