Optimization Design of Permanent Magnet Mechanism Based on 6 Sigma Design Method

With the development of DC grid technology, the application of hybrid DC switches is more and more extensive, and the reliability and life requirements of hybrid DC contactors are also increasing. As the core unit of hybrid DC contactor, mechanical switch is optimized to improve the reliability and life of the switch. In this paper, based on the 6 Sigma design method, the optimization design of the monostable permanent magnet mechanism is studied. The structural parameters were optimized with the closing force as the objective function, and the significant factors and non-significant factors were analyzed. The best factor level combination was selected to reduce the fluctuation of quality characteristics to improve the reliability of the switch and make the tolerance design reach the level of 6 Sigma. This method combines parameter optimization with reliability design and has great practical value. Finally, the experimental platform was built to verify the mechanical characteristics of the mechanical switch prototype. The experimental results verified that the opening and closing characteristics meet the design requirements.