Topological Analysis and Optimization Method Research on Thermal Circuit Matrix of Sealed Electromagnetic Relay

Small sealed electromagnetic relay is a type of commonly used micro switching devices in the aerospace field. Efficient thermal analysis methods are required in the design and analysis process. For finite element method (FEM) for relay temperature simulation has a complex boundary setting and takes long time to build model and solve. When handling multi-dimensional calculations, FEM has a low adaptability to design processes of a complex systems. This article provides a design method from the perspective of matrix transformation - inverse thermal path model - temperature rise calculation - scheme comparison - product implementation. Based on the principle of thermal circuit, a thermal circuit basic unit was established, and its thermal network was abstractly established for a typical 1/2 crystal case sealed electromagnetic relay; Build an experimental system for testing, compare the experimental data with the calculated data of the thermal network model, and verify the correctness of the thermal network model. Based on the topology analysis method, the thermal circuit topology model of the electromagnetic relay was analyzed. Searching for reasonable potential thermal paths in relay design and proposing optimization solutions. Based on the optimization scheme, the topology model of the thermal path matrix is inverted back into the thermal path, and the temperature rise of different optimization design schemes is calculated using a heat transfer equation set. Applying this method to the aforementioned typical 1/2 crystal case sealed electromagnetic relay, multiple optimization design schemes for the product were quickly obtained, and the product optimization design was completed, greatly improving the efficiency of thermal analysis and design.