Motion analysis of a Multi-DOF contact of vacumnum relay based on dynamics modelle and its load experiment

The contact forms of relay, contactor and other switching devices are diverse. Among them, the pendulum contact which has multi-degree-of-freedom (Multi-DOF) is the contact form usually used under narrow space and high load capacity, and its dynamic characteristics are different from most clapping contacts. Firstly, the electromagnetic system model of the driving part is established based on the finite element model (FEM). The static data table of the calculated attractive moment is used as the driving data of the dynamic model and compared with the actual test data for correction. Based on the mathematical calculation, the dynamic model of Multi-DOF contact is established and applied to simulate and analyze the movement process of the contact. A movement process description method is proposed from the armature, rod and contact view respectively. Then an experimental system is established to observe the contact movement process and verifies the multi-body dynamics model. Based on the above analyses, the arc breaking capacity of contacts under different DOFs are measured, the relationship between the main factors of the contact motion and the breaking capacity is established, which have enhanced the contacting stability. It provides a basic theoretical model and an analysis method to support the product optimization with this Multi-DOF contact.