摘要
针对分析混合励磁同步电机电磁特性时,三维有限元法计算量大、耗时长,解析法难以考虑铁磁材料饱和影响的问题,提出一种改进的三维等效磁网络模型。该模型考虑了模块化定子齿和转子极靴不均匀饱和,磁极间漏磁、磁极端部漏磁和定子槽内漏磁,能够快速预测具有模块化定转子结构的新型混合励磁同步电机的电磁特性;在建模过程中,根据电机转动时定转子的相对位置,建立相应的气隙磁导等效模型,以进行动态分析。利用该模型,计算了混合励磁同步电机的气隙磁通密度分布、磁链、反电动势和转矩,分析了电机的励磁调节能力。最后,将计算结果与三维有限元、样机实验结果进行比较,验证了该模型的准确性和有效性,为具有三维磁通路径特性的复杂结构电机提供一种快速的初期设计方法。相比于传统模型,该模型精度提高约9.5%;相比于三维有限元法,该模型所需计算时间仅为其0.05%。
Hybrid excitation synchronous machines(HESM),due to the advantages of convenient air gap magnetic field regulation,high torque density and high efficiency,are widely used in industrial applications,new energy transportation equipment and power generation.The three-dimensional(3D)finite element analysis(FEA)is widely used in machine design due to the ability to consider saturation and complex geometries.However,it is time-consuming due to the need for high-precision mesh.The analytical method based on Laplace-Poisson equation is one of the effective tools to quickly obtain the machines performance,but it is difficult to consider the influence of core saturation,which will reduce the calculation accuracy.In order to achieve balance between calculation accuracy and calculation time,this paper proposes an improved 3D nonlinear dynamic equivalentic magnetic network(EMN)model to predict the electromagnetic characteristics and magnetic modulation capability of the HESM.Firstly,the topology of HESM with modularized stator and rotor structure is introduced,and the axial,tangential and radial equivalent permeances in the motor are analyzed.Secondly,based on the magnetic flux tube theory,the 3D EMN model of the HESM is established considering the influence of non-uniform saturation of modular stator teeth and rotor pole shoes,flux leakage between magnetic poles,end flux leakage and the flux leakage in stator slots.Finally,the change laws of the equivalent permeances of the air gap during the machine rotation is studied,and the corresponding equivalent air gap permeance model is established to improve the speed of EMN dynamic analysis.Compared with the traditional 3D EMN model,the proposed 3D EMN model can further improve the calculation accuracy while ensuring the calculation speed for the HESM.The calculated air-gap flux density waveforms,flux linkage waveforms,back electro motive force(EMF)and torque by the proposed 3D EMN model are compared with FEA and experimental results.For the three states of no excitation current,m
作者
佟文明
王萍
吴胜男
贾建国
Tong Wenming;Wang Ping;Wu Shengnan;Jia Jianguo(National Engineering Research Center for Rare-earth Permanent Magnet Machines Shenyang University of Technology,Shenyang 110870 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2023年第3期692-702,共11页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51677122,51907129)
霍英东教育基金会青年教师基金(171049)资助项目。
关键词
混合励磁同步电机
三维等效磁网络模型
三维有限元分析
电磁特性分析
Hybrid excitation synchronous machines
3D equivalent magnetic network model
3D finite-element analysis
electromagnetic performance analysis
