Abstract：In order to improve the calculation accuracy, an improved equivalent magnetic network (EMN) model is proposed for interior permanent magnet synchronous motors (IPMSM) considering the non-uniform saturation of the magnetic bridge. By analyzing the causes of uneven saturation phenomenon, the magnetic bridge is divided into four regions. According to the geometric structure and flux distribution of each region, the nonlinear permeance unit is used to consider the non-uniform saturation and the saturation shift of the magnetic bridge. Then, taking a 20kW IPMSM as an example, the proposed model is used to analyze the no-load and load magnetic fields and no-load back electromotive force (EMF), and the calculated results are compared with the traditional EMN model, finite element analysis (FEA) and experimental results. It is shown that the proposed model can improve the calculation accuracy by more than 4% compared with the traditional EMN model. Finally, the applicability of the proposed model is analyzed. The results show that when the ratio of the maximum to minimum magnetic density in the magnetic bridge is greater than about 1.3, it is necessary to consider the non-uniform saturation of the magnetic bridge by the proposed model.
佟文明, 姚颖聪, 李世奇, 位海洋. 考虑磁桥不均匀饱和的内置式永磁同步电机等效磁网络模型[J]. 电工技术学报, 2022, 37(12): 2961-2970.
Tong Wenming, Yao Yingcong, Li Shiqi, Wei Haiyang. Equivalent Magnetic Network Model for Interior Permanent Magnet Machines Considering Non-Uniform Saturation of Magnetic Bridges. Transactions of China Electrotechnical Society, 2022, 37(12): 2961-2970.
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2022, Vol. 37 
