Analysis of Magnetomechanical Properties at the Tooth–Yoke Embedding Position in Grain-Oriented Electrical Steel Electric Motors

作者：Zhiye Li, Yuxiao Li, Yiwei Qin, Lubin Zeng, Jun Li, Ruilin Pei · 发表于：IEEE Transactions on Magnetics · 年份：2024 · DOI：10.1109/tmag.2024.3401141 · 被引用次数：3 · 研究领域：Magnetic Properties and Applications、Electric Motor Design and Analysis、Magnetic Bearings and Levitation Dynamics

In permanent magnet synchronous motors (PMSMs), grain oriented electrical steels (GOES), which have high permeability, high saturation flux density and low core losses in the rolling direction (RD), are gradually being used to increase power/torque density and efficiency. In radial flux PMSM, the use of GOES tooth yoke assemblies introduces a parasitic air gap which leads to a change in the magneto-mechanical characteristics at the position. In order to explore the effect of different shapes of parasitic air gap and to adopt a good splicing method, this paper investigates the maxwell’s stress and material properties at the parasitic air gap in dovetail and circular splices. Firstly, the electric motor performances of two kinds of spliced tooth with GOES are calculated by the finite element method (FEM), and then the maxwell’s stress distributions at the parasitic air gaps are calculated and the tensile stresses generated by different shapes of the parasitic air gaps are analyzed. The maximum stress at the parasitic air gap appears on both edges of the tooth, and the magnitude and waveform of the tensile stress are dependent on the shape of the parasitic air gap. The circular parasitic air gap can generate a maximum tensile stress of 1.4 MPa, and the stress distribution at the center of the tooth of the circular parasitic air gap is similar to a sinusoidal function. Experiments have shown that tensile stresses of 0 to 2 MPa can improve the material properties, which is due to ...