A inclined tooth structure of external rotor for reducing the radial force wave of switched reluctance motor

In order to reduce the vibration noise of switched reluctance motor, this paper proposes an inclined rotor structure. By analyzing the inductance variation of different inclined tooth structures, the best inclined tooth model is determined to reduce the radial magnetic density. According to Ohm’s magnetic field law, the magnetic equivalent circuit model is established. By analyzing the magnetic equivalent circuit model, the inclined tooth structure will probably reduce the torque of the motor. Finally, using the finite element simulation software to verify the validity of the inclined structure theory analysis, and to determine the optimal inclined angle. When the inclined angle was 4°, the average torque and efficiency are basically not reduced and the peak value of the radial force wave was reduced by 27.8%. Through the electromagnetic-acoustic multi-physics coupling, the vibration acceleration of the housing with the inclined tooth structure is reduced by 57.5%, which proves that the vibration of the motor can be effectively reduced by the inclined tooth structure.