With the continuous pursuit of motor efficiency, closed-slot rotors are gradually recognized by motor manufacturers. For three-phase asynchronous motors, due to the existence of stator and rotor grooves, the rotation will produce pulsation loss. If the rotor adopts closed slot, the effective air gap is shortened, and the pulsation of the air gap magnetic field is weakened, thus reducing the excitation potential and harmonic magnetic field loss, which helps to improve the performance of the motor.
Arch direction is an important parameter of the closed slot rotor, in the case of the same rotor slot type, the choice of different bridge arch height will have different degrees of impact on the motor performance. Closed slot rotor stacking due to no slot invisible, neatness checking is difficult, easy to appear hidden sawtooth problem, increase the uncontrollable factors.
