Core punching manufacturing is an important part of the motor manufacturer. Maximum workload, the technical requirements of the most stringent manufacturing punching, mold requirements are highest, is an important factor affecting the economic benefits, therefore, must pay attention to research core punching mold structure manufacturing process and its related problems. First, the type of punching structure and process in order to facilitate the study of motor core, according to the shape into round punching punching, fan-punching and punching pole. 1. SEGMENT generator, hydro and other large and medium core diameter of the motor exceeds 1180mm, required the use of a fan punching. Consider material utilization and condition of existing equipment, and some small motor stator core chip architecture also uses a fan. 1) stator segments punching punching although this is similar to the shape of a fan, but because of overlying different ways in many different forms of appearance. Two common stator lamination sector, as shown in Figure 5. 2) Rotate the fan rotor core laminations diameter greater than 1180mm, the use of punching fan assembly. Figure 6 is an even number of rotor grooves sector punchings (α is the angle between two adjacent grooves, z is the number of slots per segment piece). Figure 7 is an odd number grooves of the rotor SEGMENT. Figure 8 shows the fan rotating armature plate structure for three commonly used. 3. Magnetic Magnetic grade level punching punching generally used thicker (1 ~ 2mm) A3 or 16Mn steel plate punching, Figure 9a is a main pole DC motor punching, b, c of the rotation pole punching, d , e is the eddy current brake pole punching.