Commutation processes in polyphase commutatorless DC generators

The aim of this paper is to study the commutation processes in a polyphase rectified output generator with a DC type armature winding and a nearly rectangular field MMF. It is assumed that the mutual inductances between the different coils are a linear function of their relative position. This is a much more realistic assumption then the first harmonic one, and using a matrix formulation it leads to an analytical solution for the steady state behaviour from no load to short circuit. The theoretical results are very different from the ones given by the classical theory of rectification. They have been tested by experiments made on laboratory test machines.Anglai