VP6-06 Analysis of a New Consequent-Pole Hybrid Excited Machine with Drum Winding
Creators: Guangyu Qu
Jinyi Yu
Zhenghan Li
Yingcan Liu and Yongjiang Jiang
Publisher: name: IEEE
Year: 2025

I. INTRODUCTION Owing to the merits of high torque density, low permanent magnet (PM) usage and large speed range, hybrid excited (HE) machines have drawn much attention in electric vehicles [1-3]. However, due to the series magnetic circuits, slip rings and brushes can’t be avoided in HE machines with the rotor-PM structures [4]. To achieve the brushless hybrid excitation, both PMs and field coils are placed in stators, which may lead to crowed stators [5]. In this paper, a new consequent-pole HE machine with drum winding (CPHE-DW machine) are proposed, which can achieve both the brushless hybrid excitation and the excellent flux-regulating ability. II. MACHINE TOPOLOGY As shown in Fig. 1(a), The U-type PM-pole, which consists of three PMs, is housed in the consequent-pole rotor. In addition, all the PM-poles are magnetized in the same direction. To simplify the winding structure, the three-phase drum winding is adopted on the stator. The stator teeth are subdivided into the main teeth and the auxiliary teeth. The inverter circuit is illustrated in Fig. 1(b). The currents input into the winding are divided into two types: the DC component and the AC component. According to the DC current directions, the coils in each phase winding are divided into two sub-types. The DC currents and the PMs can be regarded as two excitations. According to the particular slot/pole combination, an electromagnetic coupling effect between these two excitations can be achieved. The flux paths generated by these two excitations are exhibited in Fig. 1(c). III. ELECTROMAGNETIC ANALYSIS The back electromotive forces (back-EMFs) are simulated as shown in Fig. 2(a). The output torque waves under no DC current are shown in Fig. 2(b). The average torques under different DC currents are exhibited in Fig. 2(c). Hence, it can be found that the excellent flux-regulating ability can be achieved. IV. CONCLUSION In this paper, a new CPHE-DW machine with drum winding is exhibited, in which the rotor-PM brushless hybrid excitation can be achieved.References: [1] J. Jiang and S. Niu, "A novel high-order-harmonic winding design in hybrid-excited reluctance machine for electric vehicle application," IEEE Trans. Magn., vol. 59, no. 11, pp. 1-7, Nov. 2023 [2] L. Cinti, N. Bianchi and M. Bertoluzzo, "Performance and short-circuit fault analysis in hybrid excited and interior PM motors," IEEE Trans. Energy Convers., vol. 39, no. 2, pp. 1412-1422, Jun. 2024. [3] C. Xia, Y. Feng, M. Jia, Y. Gao and S. Huang, "A novel counter-rotating axial-flux hybrid-excitation permanent magnet machine with dual-rotor," IEEE Trans. Magn., vol. 59, no. 11, pp. 1-5, Nov. 2023. [4] Q. Chen, J. Liao, Z. Sang, W. Qian, G. Xu and Z. Liu, "Design and analysis of a novel hybrid rotor PM machine considering negative torque ripple contribution," IEEE Trans. Ind. Electron., vol. 71, no. 7, pp. 6775-6786, Jul. 2024. [5] G. Qu and Y. Fan, "Design of a new consequent-pole segmented dual-stator permanent magnet machine," IEEE Trans. Magn., vol. 58, no. 2, pp. 1-5, Feb. 2022.
I. INTRODUCTION Owing to the merits of high torque density, low permanent magnet (PM) usage and large speed range, hybrid excited (HE) machines have drawn much attention in electric vehicles [1-3]. However, due to the series magnetic circuits, slip rings and brushes can’t be avoided in HE machines with the rotor-PM structures [4]. To achieve the brushless hybrid excitation, both PMs and field coils are placed in stators, which may lead to crowed stators [5]. In this paper, a new consequent-pole HE machine with drum winding (CPHE-DW machine) are proposed, which can achieve both the brushless hybrid excitation and the excellent flux-regulating ability. II. MACHINE TOPOLOGY As shown in Fig. 1(a), The U-type PM-pole, which consists of three PMs, is housed in the consequent-pole rotor. In addition, all the PM-poles are magnetized in the same direction. To simplify the winding structure, the three-phase drum winding is adopted on the stator. The stator teeth are subdivided into the main teeth and the auxiliary teeth. The inverter circuit is illustrated in Fig. 1(b). The currents input into the winding are divided into two types: the DC component and the AC component. According to the DC current directions, the coils in each phase winding are divided into two sub-types. The DC currents and the PMs can be regarded as two excitations. According to the particular slot/pole combination, an electromagnetic coupling effect between these two excitations can be achieved. The flux paths generated by these two excitations are exhibited in Fig. 1(c). III. ELECTROMAGNETIC ANALYSIS The back electromotive forces (back-EMFs) are simulated as shown in Fig. 2(a). The output torque waves under no DC current are shown in Fig. 2(b). The average torques under different DC currents are exhibited in Fig. 2(c). Hence, it can be found that the excellent flux-regulating ability can be achieved. IV. CONCLUSION In this paper, a new CPHE-DW machine with drum winding is exhibited, in which the rotor-PM brushless hybrid excitation can be achieved.References: [1] J. Jiang and S. Niu, "A novel high-order-harmonic winding design in hybrid-excited reluctance machine for electric vehicle application," IEEE Trans. Magn., vol. 59, no. 11, pp. 1-7, Nov. 2023 [2] L. Cinti, N. Bianchi and M. Bertoluzzo, "Performance and short-circuit fault analysis in hybrid excited and interior PM motors," IEEE Trans. Energy Convers., vol. 39, no. 2, pp. 1412-1422, Jun. 2024. [3] C. Xia, Y. Feng, M. Jia, Y. Gao and S. Huang, "A novel counter-rotating axial-flux hybrid-excitation permanent magnet machine with dual-rotor," IEEE Trans. Magn., vol. 59, no. 11, pp. 1-5, Nov. 2023. [4] Q. Chen, J. Liao, Z. Sang, W. Qian, G. Xu and Z. Liu, "Design and analysis of a novel hybrid rotor PM machine considering negative torque ripple contribution," IEEE Trans. Ind. Electron., vol. 71, no. 7, pp. 6775-6786, Jul. 2024. [5] G. Qu and Y. Fan, "Design of a new consequent-pole segmented dual-stator permanent magnet machine," IEEE Trans. Magn., vol. 58, no. 2, pp. 1-5, Feb. 2022.