Generalised analysis of machine windings, impedances and generated e.m.f.s, with particular reference to multispeed synchronous machines

The paper extends previously available results for the calculation of airgap flux densities, generated e.m.f.s and synchronous impedances for all types of salient-pole or segmented synchronousmachines. Special emphasis is placed on multispeed machines, both excited and unexcited, but results for single-speed machines are included as particular cases. Nonidentical phase windings are treated as is necessary for practical multispeed machines. The needs to allow, in fundamental-frequency power calculations, for pulsations in the magnetic potentials induced on the rotor, and for differences in phase associated with the different harmonics, are brought out and treated for the first time. Earlier studies of various types of single- and multispeed reluctance machines are correlated in the context of the generalised results presented.