access icon free New finite element based method for thermal analysis of axial flux interior rotor permanent magnet synchronous machine

A new method for computing convection heat transfer coefficients in axial flux permanent magnet synchronous machines (AF-PMSMs) is introduced. The method is based on a two-step finite element analysis (FEA). In the first step, a simple 2D model is introduced and fluid flow and temperature fields are studied using computational fluid dynamic (CFD) technique. Convective heat transfer coefficients for all heat transfer surfaces of the model are extracted from CFD analysis and are then used as inputs to a 3D thermal finite element model. Two case studies are considered to check the accuracy of the abovementioned two-step method. One of the case studies is an air-cooled AF-PMSM that has air inlet and outlet on its enclosure and the other case is a totally enclosed AF-PMSM. The correctness of the mentioned method is verified by practical measurements on the second case. In addition, an experimental set-up is conducted to measure the temperature of different parts of the second case. It is observed that the results of the two-step CFD-FEA model are in good agreement with the experimental data. In the other case, the effect of inlet air velocity on heat transfer coefficients, as well as the thermal behaviour of the machine are explored.

Inspec keywords: rotors; thermal analysis; synchronous machines; cooling; finite element analysis; synchronous motors; permanent magnet motors; convection; computational fluid dynamics; permanent magnet machines

Other keywords: two-step CFD-FEA model; two-step finite element analysis; axial flux interior rotor permanent magnet synchronous machine; fluid flow; air inlet; heat transfer surfaces; AF-PMSM; air-cooled AF-PMSM; 3D thermal finite element model; convection heat transfer coefficients; finite element-based method; computational fluid dynamic technique; axial flux permanent magnet synchronous machines; thermal analysis; two-step method; convective heat transfer coefficients; AF-PMSMs; CFD analysis

Subjects: Applied fluid mechanics; Numerical approximation and analysis; Numerical analysis; Convection and heat transfer; General fluid dynamics theory, simulation and other computational methods; Heat and thermodynamic processes (mechanical engineering); Fluid mechanics and aerodynamics (mechanical engineering)

http://iet.metastore.ingenta.com/content/journals/10.1049/iet-epa.2019.0514
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