Optimization design method of contact bounce and breakaway initial velocity for aerospace electromagnetic relay

Aerospace electromagnetic relay is an electric component that has been widely used in aerospace industry. Contact bounce and contact breakaway for initial velocity are the key parameters that have strong influ- ence on reliability and electric life of the relay. Generally, it is difficult to optimize these two parameters simultaneously. In this paper, according to kinetics theory and structural mechanics, a dynamic reaction calculation model of the relay that describes contact bounce and breakaway for initial velocity is proposed. Under the con- straints of contact gap and contact force, the optimal combination of debugging parameters is obtained by the ap- plication of orthogonal design. It considers the reduction of contact bounce and the augmentation of breakaway for initial velocity as the optimization objectives, and takes the debugging parameters as the optimization variables. All these above ensure the increase of contact breakaway for initial velocity and the decrease of contact bounce simultaneously, and contact arc erosion is also reduced.