关键词: 电磁铁, 剩磁, 残余吸力, 固有气隙, 方法

Abstract: Because of the remanence of soft magnetic materials, the electromagnet disk had residual magnetic attraction after the power off and it affected the normal function of the docking system of spacecraft. The principle of the residual magnetic attraction of the electromagnet disk was studied. And the equivalent magnetic circuits of the electromagnet disk were given when it was electrified and when power off. According to the equivalent magnetic circuits, the factors influencing the residual magnetic attraction were analyzed. A method to reduce the residual magnetic attraction by increasing the indigenous air of the electromagnet disk was provided. This method was validated through finite element method account and prototype machine. The research showed that the designed electromagnet disk based on this method had big magnetic attraction when it was electrified and had small residual magnetic attraction when power off, which satisfied the needing of engineering.

Key words: electromagnet, remanence, residual magnetic attraction, indigenous air, method