摘要
针对钕铁硼永磁体在受到高温、强退磁磁场等因素影响易产生局部不可逆失磁故障问题。对一台100 kW/30000 rpm十二相不控整流发电机的直流侧空载短路进行不可逆失磁分析,并探究不同转子结构对退磁率和短路电流的影响。采用二维有限元分析了不同的护套材料、永磁体的周向段数和铜屏蔽层的厚度,结果表明,在纯去磁磁场的影响下,转子中的涡流对永磁体的抗去磁能力和短路电流的峰值有显著影响。通过三维有限元仿真,现提出了一种使用碳纤维护套、分段永磁体和铜屏蔽层的复合转子结构,将永磁体的不可逆退磁率从9.6%降低到2%。这种复合转子结构可以显著提高永磁体的抗失磁性能,为这类电机的抗失磁技术提供参考。
In response to the problem of local irreversible demagnetization failure of neodymium iron boron permanent magnets caused by the factors such as high temperature and strong demagnetization field,this paper analyzes the irreversible demagnetization field of DC side no-load short circuit of a 100 kW 30000 rpm twelve-phase uncontrolled rectifier generator,and explores the influence of different rotor structures on demagnetization rate and short-circuit current.This paper analyzes the different sheath materials,the circumferential segments number of permanent magnets and the thickness of copper shielding layers by 2D finite-element method.The result indicates that the eddy current in the rotor has a significant impact on the demagnetization resistance and peak short-circuit current of the permanent magnets under the influence of a pure demagnetization field.Through 3D finite-element simulation,this paper proposes a composite rotor structure with carbon fiber sheath,segmented permanent magnets and copper shielding layer,which reduces the irreversible demagnetization rate of the permanent magnets from 9.6%to 2%.This structure can significantly improve the anti-demagnetization performance of permanent magnets,which provides the reference for the anti-demagnetization technology of such type of motors.
作者
王迎春
李祥成
王晓阳
Wang Yingchun;Li Xiangcheng;Wang Xiaoyang(CRRC Yongji Electric Machine Co.,Ltd.,Yongji 044502,China)
出处
《防爆电机》
2025年第4期27-31,42,共6页
Explosion-proof Electric Machine
关键词
十二相不控整流
空载短路
抗失磁能力
转子结构
Twelve-phase uncontrolled rectification
no-load short circuit
anti-demagnetization ability
rotor structure
