定子永磁型双转子高速电机温度场分析及冷却结构设计

Temperature field analysis and cooling structure design of the stator permanent magnet dual-rotor high-speed electrical machine

关键词:  定子永磁型电机  定子过热  冷却结构  热网络模型  温度场分析

Key words:  stator permanent magnet machine  stator overheat  cooling structure  thermal network model  temperature field analysis

摘要:

为解决定子永磁型双转子高速电机（stator permanent magnet dual-rotor high-speed electrical machine,SPMDR-HSEM）热源集中及高速运行引起的定子过热问题,本文提出一种二维三维混合热网络法对电机温度场进行分析,并设计一种新型隔磁冷却一体化结构对电机定子进行冷却,以提高电机散热能力。首先,介绍了SPMDR-HSEM拓扑结构,并分析其传热机理,确定该电机各部分导热系数及表面散热系数。其次,针对SPMDR-HSEM结构复杂、温度场难以快速准确计算的问题,建立了二维三维混合热网络模型对电机额定及过载工况下主要零部件温升进行解析计算,并搭建实验平台进行实验测试,验证所提出二维三维混合热网络模型的准确性。再次,针对SPMDR-HSEM热源集中及高速运行引起的定子过热问题,设计了一种隔磁冷却一体化结构对电机定子进行冷却,研究其结构参数及入水口流速对电机散热效果的影响,确定最佳冷却结构,并采用仿真分析验证了所提出冷却结构的有效性及合理性。该研究结果可拓宽定子永磁型高速电机的应用领域,为定子永磁型高速电机温度场分析及先进冷却结构设计提供新思路。

Abstract:

To resolve the stator overheat problem of the stator permanent magnet dual-rotor high-speed electrical machine (SPMDR-HSEM) due to its mustered heats source and high-speed operation condition, a 2D-3D hybrid thermal network model (HTNM) is built to analyze the temperature field of the electrical machine, and an integrated structure with magnetic isolation and cooling functions (IS-MIC) is proposed for accurately calculating the machine temperature and improving the machine heat dissipation capacity. Firstly, the topology of the SPMDR-HSEM is introduced, and its heat transfer mechanism is analyzed, as well as the conduction and convection heat coefficients are given. Secondly, for the problem of complex structure of the SPMDR-HSEM and the difficulty in calculating the temperature fast and accurately, the 2D-3D HTNM is proposed to analytically calculate the key components temperature rise of the SPMDR-HSEM under rated and overload conditions, its temperature distribution characteristics are summarized. And a test plat is established and the experimental tests are conducted, which verify the accuracy of the HTNM. Then, the IS-MIC is proposed to solve the heat dissipation problem of the SPMDR-HSEM, and the influence of the structure parameters and water flow velocity of the IS-MIC on the cooling effect is investigated, and the optimal structure of the IS-MIC is designed. And the finite element analysis is carried out to verify the effectiveness and rationality of the IS-MIC. It broadens the application field and provides a new temperature field analysis and cooling structure design method for the stator permanent magnet electrical machines.