In small and medium-sized motors, the rotor or stator core is often made into a twist groove to twist the rotor or stator slot into a certain shape. This special structure can improve the magnetic circuit to weaken the high-order electromagnetic harmonics to achieve smooth motor waveform, reduce the noise and vibration of the motor, reduce the loss and improve the efficiency, and obtain good starting performance and improve the electrical and mechanical resistance of the whole machine. Impact and vibration resistance. Therefore, the twisted groove has great practical significance for improving the performance index of the motor and improving the quality of the motor.
　　According to the structural twisting mode of the motor core, it can be divided into three categories: non-segment single skew, segment single skew and segment double skew, and the segmented double skew core can be divided into odd ventilation slots. And even ventilation slots are two small categories.
　　To realize the processing of the motor's twist groove, it is obviously impossible to complete the high-speed press because the torsion groove mold needs to move one step after reaching one another to reach another specific position and punch another continuous punch. After the iron chips are laminated, they can form the required twisted groove shape. To realize this function, an additional control system must be designed to cooperate with high-speed presses.