Parametric Sensitivity Analysis and Efficiency Improvement of Electromagnetic Repulsion Mechanism Based on Orthogonal Experiment Design

As a linear actuator, the electromagnetic repulsion mechanism (ERM) has the advantages of simple structure and fast driving speed and is widely used as the circuit breaker, the bypass and the grounding switch in flexible DC transmission systems. However, the low efficiency of ERM is a significant drawback. There are many parameters that affect the dynamic characteristics and efficiency of ERM, but the importance of each parameter still needs to be further explored. This article establishes a two-dimensional ERM finite element model, and verifies the accuracy of the model through preliminary experiments. Next, the efficiency of ERM at different parameter levels were calculated by the orthogonal experimental method, and the main parameters affecting performance were determined through range analysis and variance analysis. The results show that the main parameters affecting efficiency are the coil outer diameter, capacitance value, pre-charging voltage of capacitance, and mass of moving parts. The coil outer diameter is the most important parameter affecting efficiency, and the capacitance and pre-charging voltage are both important parameters. When designing ERM, different parameters should be considered based on the required performance.