Abstract
In this study, we present a thermal optimization method using the overall lumped parameter (LP) and partial computational fluid dynamics (CFD) modeling for a 600-kW permanent magnet traction motor developed for high-speed trains. The motor is totally enclosed forced ventilated to achieve high power density, high efficiency, and low maintenance requirements. Considering the electro-magnetic performance, bogie space, and thermal capacity, we propose a ventilation structure with zigzag plates in sector cross-section. We focus particularly on the ventilation channels and propose an overall LP model for thermal optimization, in which the full consideration of the influence of turbulent flow is given by using a partial CFD model. Given the specific critical parameters from the optimization results, we present a complete 3D CFD model of the whole motor to obtain an accurate temperature distribution and the maximum temperature rises in local points. The benefit of zigzag plates is studied extensively using both the LP and the complete CFD models and the results are verified by equivalent thermal experiments under rated operations. Experimental results indicate that the ventilation structure fulfills the normal operational demands of high-speed trains by improving thermal performance by more than 15%. Additionally, we propose an engineering method to estimate iron loss constraint with the complete CFD model to guide the control system design.
中文概要
目的
提出-种适用于全封闭冷却结构的电机热作能优化模 ад, 设计ᅳ台600 kW的高速列车用永磁牵引 电机«
创新点
1. 通过耦合局部流体动力学模« 的方法求解电机S 杂 冷 却 风 近 内 的 付 流 传 热 系 数, 并 ri -: 全 局 热 M 络 模 -Щ 的 框架内得到快速、准确的电机温升结果以用于结构优 化: 2. 在冷却风道中引A極格结构, 采用热性能分析 模« 优化冷却结构, 提升电机热性能: 3. 通过三维流体动力学模型计算电机局部温升最大值,并提出一种预测特定结构下电机铁损工作阀值的工程方法。
方法
1. 采用热网络法建立全局热网络模型(图3)通过偶合局部流体动力计算风近内的热 M 络参 数 (图4和6): 2. 应用田니 设计法对电机风道结构 进行优化. 并研制样机进行验证 (计算与试验结果见 表5 ): 3 假设铁损的谐波附加值与磁密值成正比, 通过三维流体动力学模型计算给出的端部绕组,永磁体温升值与铁损的预测曲线,并用样机试验进行验证。
结论
1.采用全局热网络和局部流体动力学建模的方法可以 快速、正确地计算复杂冷却结构下的电机温升分布, 且优化后的冷却结构至少可以提升文中电机 15% 的热性能;2. 文本提出的优化模型适用于全封闭风冷或者水冷 等冷却结构相对独立И. 尚无经验公式可参考的电机热性能优化设计;3.铁损工作阀值的预测方法可以为电磁和控制系统设计提供参考。
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Project supported by the National Natural Science Foundation of China (Nos. 51607123, 51577166, and U1434202) and the Fund of Wenzhou Municipal Science and Technology Bureau, China (No. ZG2017002)
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Chen, W., Wu, Gc., Fang, Yt. et al. Thermal optimization of a totally enclosed forced ventilated permanentmagnet traction motor using lumped parameter and partial computational fluid dynamics modeling. J. Zhejiang Univ. Sci. A 19, 878–888 (2018). https://doi.org/10.1631/jzus.A1700649
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DOI: https://doi.org/10.1631/jzus.A1700649
Key words
- Computational fluid dynamics (CFD)
- Lumped parameter (LP) model
- Permanent magnet (PM) synchronous motors
- Totally enclosed forced ventilated motor