Design and Analysis of a Pole-Changing Machine With Multi-Auxiliary-Teeth Structure

This article proposes a multi-auxiliary-teeth pole-changing machine based on zero-sequence current. Through changing the direction of the zero-sequence current, the excitation flux field is varied and weakened to improve its flux-weakening ability. For this proposed machine, its torque and flux-weakening ability are closely related to the number of the auxiliary teeth. In this article, the performance about the multi-auxiliary-teeth structure is analyzed based on flux modulation theory in detail. Moreover, the proposed machines with the different auxiliary teeth are simulated by finite element analysis (FEA) method and further compared. According to the comparison results, the best scheme is determined with the relatively high torque and flux-weakening ability simultaneously.