The motor is widely used in office equipment, covering all areas of people's work and life, such as printers, copiers, fax machines, projectors, glue machines, lifting office seats, etc. For today's designers, in order to meet the energy efficiency laws and regulations around the world and the higher demand of end users for energy conservation, it is necessary to improve the energy efficiency of power supply, improve the power factor and reduce the energy consumption of light load and standby. It is also necessary to improve the energy efficiency of motors widely used in today's electronic products, reduce their energy consumption and provide reliability.