Dynamic characteristics of large permanent magnet direct‐drive generators considering electromagnetic–structural coupling effects

作     者：Qinkai Han Xueping Xu Zhihong Zhang Yifeng Yan Chao Peng Fulei Chu 

作者机构：Department of Mechanical EngineeringThe State Key Laboratory of TribologyTsinghua UniversityBeijingChina School of Instrumentation and Optoelectronic EngineeringResearch Institute for Frontier ScienceBeihang UniversityBeijingChina Institute of Research CenterXinjiang Goldwind Science and Technology Co.Ltd.XinjiangChina 

出 版 物：《International Journal of Mechanical System Dynamics》 (国际机械系统动力学学报（英文）)

年 卷 期：2023年第3卷第1期

页      面：25-38页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0702[理学-物理学] 

基　　金：National Natural Science Foundation of China,Grant/Award Numbers:11872222,11902173 State Key Laboratory of Tribology,Grant/Award Number:SKLT2021D11。 

主　　题：permanent magnet direct‐drive generators dynamic characteristics electromagnetic–structural coupling effects conformal mapping magnetic equivalent circuit model electromagnetic springs 

摘      要：Dynamic characteristics of large permanent magnet direct‐drive generators(PMDGs)considering electromagnetic–structural coupling effects are analyzed in this study.Using the conformal mapping method,the scalar magnetic potential of the air gap magnetic field considering the slot effect is calculated.On the basis of the discrete current element and magnetic equivalent circuit model,the local magnetic saturation effect of the stator and rotor is quantitatively simulated and the air gap magnetic field intensity distribution is obtained via numerical simulation.A series of uniformly distributed equivalent electromagnetic springs are introduced to develop an electromagnetic–structural coupling finite element PMDG model.The proposed air gap field analysis method is verified by the finite element analysis results.On the basis of the test platform for the Goldwind 1.5MW PMDG,both modal and dynamic response tests for the stator/rotor coupling system are conducted,and the results are compared with the natural frequencies,mode shapes,and vibration responses obtained using the numerical model.The effects of the air gap length and rotor speed on the natural frequencies of the coupling system are analyzed.The proposed model has the potential to accurately evaluate the PMDG vibration energy,avoiding resonance points,and maintaining stable operations of the unit.