With the implementation of "made in China 2025", China's industrial structure will move towards the high-end development. The manufacturing of frequency conversion, intelligent and high-end chemical, mechanical and electrical products has become an industry consensus. To provide support for the development of low consumption and high efficiency dc inverter motor and pump industry; Consumer demand induces the transformation of white electricity industry, and the rise of the Internet of things promotes the development of dc, modularization and electromechanical integration into a new trend of future technology development.