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

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.