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

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International Journal of Mechanical System Dynamics 2023年第1期3卷 25-38页

作者： Qinkai Han Xueping Xu Zhihong Zhang Yifeng Yan Chao Peng Fulei Chu Department of Mechanical Engineering The State Key Laboratory of TribologyTsinghua UniversityBeijingChina School of Instrumentation and Optoelectronic Engineering Research Institute for Frontier ScienceBeihang UniversityBeijingChina Institute of Research Center Xinjiang Goldwind Science and Technology Co.Ltd.XinjiangChina

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.

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

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