Influence of Copper Plating on Electromagnetic and Temperature Fields in a High-Speed Permanent-Magnet Generator
Influence of Copper Plating on Electromagnetic and Temperature Fields in a High-Speed Permanent-Magnet Generator
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DOI：
10.1109/tmag.2012.2190740
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发表时间：
2012-03
影响因子：
2.1
通讯作者：
Li Weili;Qiu Hongbo;Zhang Xiaochen;Yi Ran
中科院分区：
文献类型：
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作者：
Li Weili;Qiu Hongbo;Zhang Xiaochen;Yi Ran
在高速永磁发电机（HSPMG）中，通常使用合金套筒来防止转子磁体由于大的旋转离心力而引起的损坏。然而，套管中出现的涡流损耗增加了发电机的工作温度，这可能会降低发电机的性能，甚至导致磁体的热退磁。因此，有必要设计一种低涡流损耗的套筒方案，本文提出了一种镀铜转子结构。建立了一台117 kW、60 000 rpm高速永磁发电机的二维数学模型，采用有限元法计算了发电机内的电磁场。结果表明，镀铜层对降低转子涡流损耗有明显效果，并分析了轴套厚度和镀铜层厚度对转子涡流损耗的影响。基于流体力学和传热学理论，采用流-热耦合方法，对比分析了不同铜层厚度下发生器的温度分布。得出了温度与铜层厚度的关系，最后给出了不同铜层厚度下受温度影响最严重的永磁体的温度。所得结论可为高速脉冲磁流变液的设计和研究提供参考。
In a high-speed permanent-magnet generator (HSPMG), an alloy sleeve is often used to prevent damage to rotor magnets caused by the large rotational centrifugal forces. However, eddy-current losses appearing in the sleeve increase the generator working temperature, which may reduce the generator performance and even cause thermal demagnetization of the magnets. Thus, a sleeve scheme designed with low eddy current losses is necessary, and a rotor structure with copper plating is presented in this paper. The two-dimensional mathematical model of a 117 kW, 60 000 rpm HSPMG is established, and the electromagnetic field in the generator is calculated using the finite element method. The results show the effectiveness of the copper plating in reducing the eddy current losses in the rotor, and the influences of the sleeve thickness and the copper layer thickness on rotor eddy current losses are analyzed. Using the fluid-thermal coupling method, the temperature distribution of the generator with different copper layer thicknesses is comparatively analyzed based on the theories of fluid mechanics and heat transfer. The relationship between the temperature and the copper layer thickness is obtained, and finally the temperature of the permanent magnets, which is the part most seriously affected by the temperature, is given with different copper layer thicknesses. The obtained conclusions may provide useful reference for the design and research of HSPMG.