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Abstract

The innovaTive design concepT of Thermal model for The calculaTion of The elecTromagneTic circuiT of roTaTing elecTrical machines innowacyjna koncepcja budowy obliczeniowego modelu cieplnego dla obwodu elekTromagneTycznego wirujących maszyn elekTrycznych* Operating parameters and reliability of rotating electrical machines are connected to a large extent with their thermal state. The high temperature of these devices has an impact on the life of such elements as bearings, windings, andalso efficiency and possibility of their use. More often, during the analysis of the existingand new designs of electrical machines,the thermal and mechanical calculations are carried out. The finite element method which uses spatial models is commonly used in such calculations. The correct formulation of boundary conditionsand the appropriate model simplifications are the key problems. Parameters calibration of thecalculation model in order to obtain adequate calculations results to the actual device operation is necessary to performed. The innovative conception for determining the thermal parameters of the numerical model for the most complex structure of electrical machinery, which is the electromagnetic circuit, is presented in this paper. During the preparation of the thermal IntroductionGrowing demands on the efficiency of electric motors, as well as economic aspects and diversity of application cause that in the design of electrical machines not only electrical parameters are important.The higher reliability, minimize weight and dimensions, high strength, and appropriate vibration, noise and thermal stateparameters are required from actually designed and manufactured electrical machines [1,[4][5][6]10]. In other words, electrical machines should be optimized to working conditions in which they are operated. This approach necessitate development of newer and more elaborate design. At the same time in the design process of modern electrical machines the interdisciplinary knowledge in the field of electrical engineering, electronics, strength sciENcE aNd tEchNology of materials, thermodynamics, fluid mechanics and acoustics is required from constructor.The development of computer technology and constantly increasing computing capabilities have contributed to the development of numerical methods and increasing popularity of programs supporting the work of design engineers. Skillful use of specialized software in the design of electrical machines can increase the efficiency of project work and motor durability simultaneously reducing their weight, vibration, noise and temperature. In the available publications, it can be seen that more often to thedesign analysis of electrical machine researchers use sophisticated computational programs. In addition to the mechanical analysis, software for thermal and flowanalysis based on FEM and CFD or the Lumped Parameter Modelingis becoming more popular [2].In the literature related to this subject, different ways of modeling and calibration of computational models and related problemscan be...