... 3.Stamping:high speed stamping4,automatic welding or riveting 1,external rotor brushless motor2,Material: silicon steel ,Stainless steel , Iron3 ... Parts (including DC brushed motor commutator, BLDC motor commutator, AC series motor commutator, FHP motor commutator, PSC motor commutator, ... for oil hydraulic equipment and exhaust equipmentIron cores for AC and DC series excitation motors and hand tool ...