VP21-08 Design and Analysis of a Pole-changing Machine with Multi-auxiliary-teeth Structure
Creators: Wenjie Wu
Mingyuan Jiang
and Shuangxia Niu
Publisher: name: IEEE
Year: 2025

I. Introduction With the increasing demand for high-speed and high torque density machines in electric vehicles application fields, the pole-changing machine has attracted more and more attention because of its superior effects in speed range expansion. At present, many different pole-changing machine structures such as [1],[2] are designed to improve the flux-weakening ability, while pay little attention to the torque density. In order to realize the high torque density and improved flux-weakening ability simultaneously, the multi-auxiliary teeth structure is applied in a pole-changing machine. Besides, the number of the auxiliary teeth is the key factor to influence the torque and flux-weakening ability of this proposed machine. Therefore, the performances with the different auxiliary teeth are simulated and compared which helps to select the optimal design based on different design requirements. II. Proposed design and simulated result Fig. 1 illustrates the proposed topological structure and the different auxiliary teeth distribution. It can be observed that the number of the auxiliary teeth mainly affect the pole-pair number of the excitation source. Therefore, when the number of auxiliary teeth changes, the flux density and flux linkage of the proposed machine have the variation, which affects the torque density and flux-weakening ability. The specific relationship between them will be deduced in detail in subsequent paper. Fig. 2 illustrates the comparison results of the torque and flux-weakening ability based on the different auxiliary teeth structures. With the increase of the auxiliary teeth number, the torque performance of the proposed machine is improved while the flux weakening ability is decreased.References: [1] M. Tian, X. Wang, D. Wang, W. Zhao and C. Li, "A Novel Line-Start Permanent Magnet Synchronous Motor With 6/8 Pole Changing Stator Winding," IEEE Trans. Energy Convers., vol. 33, no. 3, pp. 1164-1174, Sept. 2018. [2] C. Contà and N. Bianchi, "Pole-Changing in Synchronous Machines: A Reluctance-Permanent Magnet Hybrid Motor," IEEE Trans. Ind. Appl., 2023, doi: 10.1109/TIA.2023.3338194.
I. Introduction With the increasing demand for high-speed and high torque density machines in electric vehicles application fields, the pole-changing machine has attracted more and more attention because of its superior effects in speed range expansion. At present, many different pole-changing machine structures such as [1],[2] are designed to improve the flux-weakening ability, while pay little attention to the torque density. In order to realize the high torque density and improved flux-weakening ability simultaneously, the multi-auxiliary teeth structure is applied in a pole-changing machine. Besides, the number of the auxiliary teeth is the key factor to influence the torque and flux-weakening ability of this proposed machine. Therefore, the performances with the different auxiliary teeth are simulated and compared which helps to select the optimal design based on different design requirements. II. Proposed design and simulated result Fig. 1 illustrates the proposed topological structure and the different auxiliary teeth distribution. It can be observed that the number of the auxiliary teeth mainly affect the pole-pair number of the excitation source. Therefore, when the number of auxiliary teeth changes, the flux density and flux linkage of the proposed machine have the variation, which affects the torque density and flux-weakening ability. The specific relationship between them will be deduced in detail in subsequent paper. Fig. 2 illustrates the comparison results of the torque and flux-weakening ability based on the different auxiliary teeth structures. With the increase of the auxiliary teeth number, the torque performance of the proposed machine is improved while the flux weakening ability is decreased.References: [1] M. Tian, X. Wang, D. Wang, W. Zhao and C. Li, "A Novel Line-Start Permanent Magnet Synchronous Motor With 6/8 Pole Changing Stator Winding," IEEE Trans. Energy Convers., vol. 33, no. 3, pp. 1164-1174, Sept. 2018. [2] C. Contà and N. Bianchi, "Pole-Changing in Synchronous Machines: A Reluctance-Permanent Magnet Hybrid Motor," IEEE Trans. Ind. Appl., 2023, doi: 10.1109/TIA.2023.3338194.