Affiliation:
1. Department of Electrical and Electronic Engineering, Hosei University, Koganei, Tokyo 184-8584, Japan
Abstract
AbstractWith the development of electrical machines for achieving higher performance and smaller size, heat generation in electrical machines has also increased. Consequently, the temperature rise in electrical machines causes unexpected heating of components and makes it difficult to operate properly. Therefore, in the development of electrical machines, the accurate evaluation of temperature increase is important. In the thermal design of electrical machines, heat-conduction analysis using the heat-transfer boundary set on the surface of a heated target has been frequently performed. However, because the heat-transfer coefficient is dependent on various factors, it is often determined based on experimental or numerical simulation results. Therefore, setting the heat-transfer coefficient to a constant value for the surface of the heated target degrades the analysis accuracy because the actual phenomenon cannot be modeled. To enhance the accuracy of the heat-transfer coefficient, the coupled electromagnetic field with heat-conduction analysis finite element method (FEM), thermal-fluid analysis using FEM, and the highly simplified marker and cell method is applied to the estimation of the distribution of the heat-transfer coefficient. Moreover, to accurately calculate the localized heat-transfer coefficient, the temperature distribution and flow velocity distribution around the heated target are analyzed in the induction-heating apparatus.
Subject
General Physics and Astronomy
Reference26 articles.
1. A survey of finite differences with upwinding for numerical modelling of the incompressible convective diffusion equation;Comput Techniq Trans Turbul Flow,1981
2. Comparison of CFD analyzing strategies for hydrogenerators;Int Conf Electr Mach,2014
3. Moving-particle semi-implicit method for fragmentation of incompressible fluid;Nuclear Sci Eng,1996
4. Design optimization of primary core in induction heating roll by combination of 2D level-set method and 3D coupled magnetic-thermal FEM;IEEE J Ind Appl,2018
5. Magneto-thermal-fluid analysis taking account of natural convection using semi-Lagrange coordinate system;IEEE Trans Magn,1999