VP4-03 Effect of Different Winding Layers and Connection Method on the Electromagnetic Performance of Dual Three-Phase HSPMSG
Creators: Qinglin Fan
Xiangjian Zhang
Xiaodong Hu
Lubin Zeng and Ruilin Pei
Publisher: name: IEEE
Year: 2025

In recent years, dual three-phase(DTP) high-speed permanent magnet synchronous generators(PMSG) have been widely used in the aerospace field due to their high reliability. However, it tends to generate abundant harmonics when the generator is loaded. Researchers have proposed the use of dual multiphase winding to reduce the low harmonics of fractional slot winding[1],[2], but the use of multilayer and star-delta connection winding has a more significant impact in reducing the harmonic of the MMF. In this paper, five different winding configuration are investigated: three-phase double-layer short-pitch winding, DTP star-star connection double-layer winding(DLW), DTP star-delta connection DLW, DTP star-star connection four-layer winding(FLW), and DTP star-delta connection FLW. Firstly, 24-plot/4-pole finite element analysis(FEA) model is established to study the performance of these five winding configurations in terms of winding coefficient, harmonic distribution of armature MMF, radial air-gap magnetic flux density, electromagnetic torque, torque ripple, and inductance between different winding. The results show that when the number of winding layers is the same, the motor with star-delta connection can significantly reduce the low harmonics of the radial armature magnetic flux density and increase the amplitude of the armature fundamental MMF, thus improving the electromagnetic torque. When the number of winding layers is increased from two to four, the torque ripple, iron and copper loss are reduced. The armature fundamental MMF and average torque are slightly lower as shown in Fig.1, which is acceptable for the generator. Furthermore, the multi-objective optimization strategy is used to optimize and analyze the DTP star-delta connection FLW motor, and the torque ripple is reduced to 0.15%. Finally, a 24-plot/4-pole prototype is developed based on the optimized design scheme of the DTP star-delta connection FLW motor as shown in Fig. 2.References: [1] A. S. Abdel-Khalik, S. Ahmed, and A. M. Massoud, “Low Space Harmonics Cancelation in Double-Layer Fractional Slot Winding Using Dual Multiphase Winding,” IEEE Trans. Magn., vol. 51, no. 5, pp. 1–10, May 2015. [2] V. I. Patel, J. Wang, W. Wang, and X. Chen, “Six-Phase Fractional-Slot-per-Pole-per-Phase Permanent-Magnet Machines With Low Space Harmonics for Electric Vehicle Application,” IEEE Trans. Ind. Appl., vol. 50, no. 4, pp. 2554–2563, Jul. 2014.
In recent years, dual three-phase(DTP) high-speed permanent magnet synchronous generators(PMSG) have been widely used in the aerospace field due to their high reliability. However, it tends to generate abundant harmonics when the generator is loaded. Researchers have proposed the use of dual multiphase winding to reduce the low harmonics of fractional slot winding[1],[2], but the use of multilayer and star-delta connection winding has a more significant impact in reducing the harmonic of the MMF. In this paper, five different winding configuration are investigated: three-phase double-layer short-pitch winding, DTP star-star connection double-layer winding(DLW), DTP star-delta connection DLW, DTP star-star connection four-layer winding(FLW), and DTP star-delta connection FLW. Firstly, 24-plot/4-pole finite element analysis(FEA) model is established to study the performance of these five winding configurations in terms of winding coefficient, harmonic distribution of armature MMF, radial air-gap magnetic flux density, electromagnetic torque, torque ripple, and inductance between different winding. The results show that when the number of winding layers is the same, the motor with star-delta connection can significantly reduce the low harmonics of the radial armature magnetic flux density and increase the amplitude of the armature fundamental MMF, thus improving the electromagnetic torque. When the number of winding layers is increased from two to four, the torque ripple, iron and copper loss are reduced. The armature fundamental MMF and average torque are slightly lower as shown in Fig.1, which is acceptable for the generator. Furthermore, the multi-objective optimization strategy is used to optimize and analyze the DTP star-delta connection FLW motor, and the torque ripple is reduced to 0.15%. Finally, a 24-plot/4-pole prototype is developed based on the optimized design scheme of the DTP star-delta connection FLW motor as shown in Fig. 2.References: [1] A. S. Abdel-Khalik, S. Ahmed, and A. M. Massoud, “Low Space Harmonics Cancelation in Double-Layer Fractional Slot Winding Using Dual Multiphase Winding,” IEEE Trans. Magn., vol. 51, no. 5, pp. 1–10, May 2015. [2] V. I. Patel, J. Wang, W. Wang, and X. Chen, “Six-Phase Fractional-Slot-per-Pole-per-Phase Permanent-Magnet Machines With Low Space Harmonics for Electric Vehicle Application,” IEEE Trans. Ind. Appl., vol. 50, no. 4, pp. 2554–2563, Jul. 2014.