Thermal Measurement and Thermal Modelling of Electrical Insulation Systems in Electric Machines
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Inclou dades d'ús des de 2022
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hdl:2117/371737
Tipus de documentProjecte Final de Màster Oficial
Data2022-06-27
Condicions d'accésAccés obert
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Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
Improved cooling in electric machines is of importance to achieve enhanced performance in electric machines and, in general, a necessary step in Scania’s transition to electrification. The cooling of electric machines can be improved in several aspects, and one crucial part is to improve the thermal conductivity of insulating materials within stator slots. The majority of thermal conductivity resistance in the stator, which opposes heat extraction, is due to the electrical insulation materials used inside the slots. In this thesis project, several GPMs, made with different combinations of insulating materials have gone through thermal measurements in order to compare their thermal conductivity. Afterwards, the effect of thermal aging has been investigated on the thermal conductivity of insulating materials using accelerated aging methods. Furthermore, a 2D model has been developed in COMSOL and MATLAB to evaluate the equivalent thermal conductivity of each insulation layer combination. The report starts with a short description of the electric machines' cooling mechanisms and heat generation sources. Basic theoretical knowledge in heat transfer that is required during the project is presented. This project explains the steps and challenges of manufacturing GPMs in the lab environment and all the errors and difficulties experienced during the experimental thermal measurement. Finally, validation of simulations using experimental data and utilizing these models to measure the effective thermal conductivity of materials is explained. Further investigation of experimental observation is continued by cutting GPMs and performing SEM (Scanning electron microscope) analysis. Finally, the report concludes by demonstrating the equivalent thermal conductivity of electrical insulation material together with their pros and cons.
MatèriesElectric machines, Electric machines--Cooling, Màquines elèctriques, Màquines elèctriques--Refrigeració
TitulacióMÀSTER UNIVERSITARI ERASMUS MUNDUS EN SISTEMES DESCENTRALITZATS D’ENERGIA INTEL·LIGENTS (DENSYS) (Pla 2020)
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master-s-thesis ... mmad-roozbahani-scania.pdf | 2,270Mb | Visualitza/Obre |