Motor line 1: successively complete the assembly of all parts of the four motors Motor line 2: successively complete the assembly of all parts including of 8 motors --- including coil group, thin silicon steel sheet, thick silicon steel sheet, rotor, bearing, base, small base, plastic fan, metal fan bolt and other parts. and test all mechanical parameters of the assembled products, as well as screen the defective products found in the assembly and testing process, and finally output the qualified production line realizes semi-automatic production.