Atef S. Refiniment of correlation between geometrical and power parameters of electrical machine series for determination of criterion of their optimality

The aim of theses is to define more precisely really existing correlations of dimensions and power parameters of revolving electrical machines in order to get the criterion of technical optimum of the series and development ways. The investigations were carried out with the use of methods of electrical machines' theory, electromagnetic field, heat transfer mathematical statistics, probability theory and errors analysis. Well-known indexes of level dependence of electromagnetic power and summary power losses for the linear dimension 4 and 3 accordingly on the basis of analytical investigations are extended to the ranges of 1,5-5 and 2-3,5. Theoretical and semi-empirical dependence of the efficiency in accordance with the total linear dimensions are offered. A rotation axis height is selected as a linear dimension. The values of indexes of level dependence of electromagnetic power and summary power of some series of synchronous and asynchronous electrical machines losses are calculated, the majority bein g adequate to the theory developed. The criterion of optimum of electrical machines series is received and the ways of their improvement are offered. The results of the research can be used for the selection of the best technically series of electrical machines and evaluation of their level and competability.