A Novel Buffering Method for Permanent Magnet Electromagnetic Repulsion Mechanism

The electromagnetic repulsion mechanism (ERM) is a vital operation mechanism of the high speed switch (HSS) owing to its simple structure and fast response capability. However, the rapidity of the ERM will cause too high terminal velocity, which may lead to the rebound of the switch. In this paper, a novel buffering method for the permanent magnet electromagnetic repulsion mechanism (PMERM) is proposed. The method realizes the opening buffer by shorting the closing coil in the process of opening. Based on the Lenz's law, we use the induced voltage generated in the closing coil during the opening process to generate the buffer current and thus provide the reverse buffer force. To validate the method, the multi-physical domain co-simulation numerical model is implemented using the ANSYS Maxwell and ANSYS Simplorer. Finally, an HSS based on the PMERM prototype is developed to verify the simulation results. The effectiveness of the proposed method is thus verified via simulations and experiments.