The prototype pcb assembly for starter has the characteristics of small starting current, large starting torque, automatic adaptation to changes in power supply and load, and protection of the motor. Widely used in metallurgy, machinery, petroleum, chemical, mining, building materials, paper, rubber, water plants, power stations and other industrial fields of ball mills, crushers, fans, pumps, beaters, air compressors, rolling mills, hot mills, Starting of a wound-type asynchronous motor in a motor drive device such as an oxygen generator.