张凤阁 蒋晓东 李应光

摘 要：为了降低笼障转子无刷双馈电机的温升，进一步提高其功率密度，提出采用水冷方式替代风扇冷却对该种新型电机进行冷却系统设计。建立水冷系统解析计算模型，分别设计了轴向和螺旋两种水路结构，计算两种水路结构机壳表面温度，并对两种水路结构进行对比分析。选取无刷双馈电机周向1/6区域作为研究对象，建立三维稳态温度场物理模型，通过采用有限元方法计算了电机各部分的温升分布，并对结果进行详细分析。最后将有限元计算结果与解析结果进行对比，验证了螺旋水路冷却方案设计的有效性，为后续水冷样机的研制和进一步实验研究提供理论依据。

关键词：笼障转子；无刷双馈电机；解析模型；冷却系统；螺旋水路

中图分类号：TM 352

文献标志码：A

文章编号：1007-449X（2018）06-0070-07

Abstract：For reducing the temperature rise of brushless doublyfed machine with cagebarrier rotor and improving the power density further， water cooling mode is put forward instead of fan cooling to design the cooling system. The analytical calculation model of water cooling system was established. The structures of axial and spiral water road were designed respectively. The temperature of casing surface was calculated. The advantages and disadvantages of two kinds of water road structure were compared and analyzed. Circumferential 1/6 structure of BDFM with cagebarrier rotor was taken as research object and 3D temperature field physical model was established. The temperature rise distribution of each parts of electrical machine were calculated by using finite element method and the results were analyzed in detail. Finally the numerical calculation results were compared with analytical calculation results and the effectiveness of cooling design scheme of spiral water road was verified. It provides theoretical basis for the development and further experimental research of subsequent watercooled prototype machine.

Keywords：brushless doublyfed machine； cagebarrier rotor； analytical model； cooling system； spiral water road

0 引 言

無刷双馈电机（brushless doublyfed machine，BDFM）是一种新型结构的电机，其结构取消了电刷和滑环，降低了电机维护成本，增强了电机运行时的可靠性和安全性，在变速恒频恒压发电和大容量变频调速系统中具有广泛应用前景[1-3]。

BDFM定子上嵌有极数不同的两套绕组，分别为控制绕组和功率绕组，运行时功率绕组与电网直接相连，控制绕组通过变频器与电网相连。BDFM两套绕组通过特殊转子结构磁场调制作用进行耦合，转子起着“极数转换器”的作用，转子性能的好坏直接决定着电机的功率密度和效率。

然而该种电机谐波磁场较为丰富，损耗较大，温升问题尤为突出，直接影响到电机运行时的性能指标，并且限制了电机功率密度的进一步提高，因此有必要对该种电机的温度场和冷却方式进行研究。……