Conference: 2025 25th International Conference on the Computation of Electromagnetic Fields (COMPUMAG)
Authors: Ji-Hoon Lee, Seung-Hun Lee, Yun-Jae Won, Byeong-Cheol Bae, Moo-Hyun Sung, Myung-Seop Lim
DOI:
Induction motors (IMs) have long been widely used as industrial motors. Although the required characteristics of IMs may vary depending on the application, reducing noise, vibration and harshness is a common requirement across all fields. As demonstrated in multiple studies, the radial electromagnetic force is the most influential factor affecting the vibration characteristics of electric motors. Therefore, analyzing the radial electromagnetic force is essential for enhancing the vibration performance of electric motors. However, finite element analysis (FEA) of IMs requires considerable computation time, as it must be conducted as a transient analysis. In this paper, stepping time-harmonic FEA is proposed for the fast calculation of the radial electromagnetic force in IMs. Unlike conventional time-harmonic FEA, the proposed method incorporates mechanical and electrical rotation of the IM in the analysis. The proposed method was used to obtain the airgap flux density over one electrical period, and the radial electromagnetic force density was calculated using Maxwell stress tensor. The spatial and temporal orders of the radial electromagnetic force density were analyzed using 2-dimensional (2D) fast Fourier transform, and good agreement was confirmed between the proposed method and the 2D transient FEA. The proposed method significantly reduces the computation time required for calculating the radial electromagnetic force density compared to 2D transient FEA. Therefore, it was confirmed that the proposed method enables rapid computation of the radial electromagnetic force density in the IM, while ensuring a high level of accuracy.