The well known semi-empirical methods of the commutation do notmeet our expectations. Thus, we have developed a specific method linkingnumerical calculations for the iron parts (by using the FLUX2D programin magnetostatic and in transient magnetic (i.e., use of the moving airgap) and an analytical calculation for the end windings. The approach isas follows: numerical calculation using a finite element method of theinductances and of the mutuals: of the commutating poles, of eachspecified rotor conductor, of conductor to conductor located in the sameslot, and from slot to slot for each angular position of the rotor;tridimensional analytical calculation of the field in each space pointby integration of the Biot and Savart formulation and by using themethod of the electrical images: proper inductance of the end windings,and mutuals of the different windings. The calculation results areconfirmed by experimental tests realised on an instrumented motor
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