3-D analysis of induction motor with skewed slots using regular coupling mesh

A new method using a regular coupling mesh is proposed for problems involving movement in the FEM analysis of electric machines using edge elements. The fixed and moving regions are coupled through the mesh. The approach allows simple and independent generation of rotor and stator meshes. An induction motor with skewed slots is analyzed in 3-D by this method and the results are compared to measurements. The authors investigated the effects of the skewed slots and the end-rings on the characteristics of the induction motor, which are difficult to analyze in 2-D analysis. The good agreements between the numerical results and experimental data validate the applicability of the proposed method.