Modeling and simulation of hermetically sealed electromagnetic relay under mechanical environment

摘要

Hermetically sealed electromagnetic relays (EMR) are widely used for high reliability control and executive systems as a device mechanically transferring signals. Now they are more indispensable in space engineering, such as rockets, satellites and other ground attachment, but which mechanical atmosphere is too harsh. So structures analysis of EMR is needed to satisfy particularity of such mechanical atmosphere. In this paper, a typical hermetically sealed EMR structure is modeled by using finite element analyzing software-Nastran. In the meantime the finite element model of normally closed contacts, the contact between armature and yoke is investigated by using Hertz theory. And dynamic performance is simulated under different mechanical environment, including sinusoid vibration condition and impact vibration condition. The factors affecting vibration modal and dynamic response of relay is analyzed. The results of the analysis can be useful for designers to develop optimal structure of relays.