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General modeling of the windings for multi-phase ac machines

Application for the analytical estimation of the mutual stator inductances for smooth air gap machines

Published online by Cambridge University Press:  17 May 2010

F. Scuiller ,
E. Semail  and
J.-F. Charpentier
F. Scuiller*
Affiliation:
Institut de Recherche de l'École Navale, 29240 Brest-Armées, France
E. Semail
Affiliation:
Arts et Métiers ParisTech, 59000 Lille, France Université Lille Nord de France, 59000 Lille, France
J.-F. Charpentier
Affiliation:
Institut de Recherche de l'École Navale, 29240 Brest-Armées, France
*
franck_scuiller@yahoo.fr

Abstract

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This paper, which deals with the winding modeling of ac multi-phase machines with a regular distribution of the stator slots, details an original matrix modeling of the stator winding. First, the properties of the balanced multi-phase windings (with integral-slot and fractional-slot patterns) are analysed. The winding function approach, one of the most common way to model the winding distribution effects on the stator rotating field, is then introduced. For multi-phase machines, it will be shown that the pole number generated by the winding distribution depends on a new parameter: the circularity index. The discrete nature of the winding, imposed by the stator slots, leads to the development of a discrete modeling of the winding obtained from sampling the winding function: two matrices, the winding function matrix and the distribution function matrix, are introduced to characterize the multi-phase winding. This matrix approach is thus a concise way to calculate the winding factors and to estimate the set of self and mutual stator inductances for smooth air gap multi-phase machines. A particularly original method of obtaining an analytical expression for the leakage mutual inductance is described. The results are validated with two experimental 5-phase PM machines by using experimental measurements and numerical simulations.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 50 , Issue 3 , June 2010 , 31102
Copyright
© EDP Sciences, 2010

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