Performance of a five-phase induction machine with single-tooth winding under open-phase conditions

Five-phase induction machine with a single-tooth winding is shown promise when compared with a conventional five-phase distributed winding in some applications such as high frequency induction motors and motors with long stators and limited diameters. Unlike a conventional five-phase with distributed winding, the effect of non-fundamental subspaces is a quite different in a single-tooth winding. In this paper, a five-phase induction machine with a single-tooth winding is investigated under open-phase conditions. Firstly, the MMF distribution of a conventional full-pitch concentrated winding and a single-tooth winding are compared to explore the effect of different subspaces. Then, the steady-state model using the symmetrical components theory is derived to compare the machine performance under healthy and open-phase conditions. A prototype five-phase machine with a single-tooth winding has been used to verify the derived mathematical model under different operational cases.