EQUIVALENT THERMAL CONDUCTIVITY OF INSULATING MATERIALS FOR HIGH VOLTAGE BARS IN SLOTS OF ELECTRICAL MACHINES
The equivalent thermal conductivity of insulating materials for a high voltage bar in slots of electrical machines is calculated using the finite element method. This allows the use of much coarser meshes with an equivalent thermal conductivity k e , without accuracy loss in the hot spot temperature calculation. It is shown the dependency of k e value on the equivalent mesh used. Some considerations are also presented on the heat flux finite element calculation.
KeywordsElectrical Machine Coarse Mesh Thermal Source Integration Line Thermal Problem
Unable to display preview. Download preview PDF.
- E. Matagne, “Macroscopic Thermal Conductivity of a Bundle of Conductors”, Conference on Modelling and Simulation of Electrical Machine and Static Converters (IMACS TC1’90), Nancy, France, September 1990, pp. 189–193.Google Scholar
- M. Dodd, “The Application of FEM to the Analysis of Loudspeaker Motor Thermal Behavior”, 112th Audio Engineering Society Convention (AES 112th Convention), München, Germany, May 2002.Google Scholar
- J. Holman, Heat Transfer, 6th edition, New York: McGraw-Hill Book Company, 1986.Google Scholar
- J.C. Coulomb, J.C. Sabonnadiere, CAO en électrotechnique, Paris, France: Hermes Publishing, 1985, pp. 41–43.Google Scholar
- J. Pinto, C.L. Antunes, A.P. Coimbra, “Influence of the Thermal Dependency of the Windings Resistivity in the Solution of Heat Transfer Problem Using the Finite Element Approach”, Proc. of the International Conference on Electrical Machines (ICEM94), Paris, France, September 1994, pp. 448–451.Google Scholar