Modal Analysis and Calculation of Stator Core with Welding Slots of PMSM for Electrical Vehicles

In view of the influence of welding slots on the circumferential mode of stator core, this paper proposes a calculation method of stator natural frequency based on the hybrid beam element model. This method equates the yoke, teeth and yoke with welding slots of motor stator core into different beam elements. According to the overall stiffness matrix and overall mass matrix of stator core, the circumferential mode frequency and vibration mode of stator core with welding slots are accurately calculated, and compared with the results calculated by the finite element method. Further, this method was used to investigate the influence of the number, length, and depth of welding slots on the natural frequency of the stator core, and to summarize its rules. Finally, the correctness of the beam element model method and the finite element model was verified using the exciter modal experimental method.