VP21-05 Research of Asymmetric Interior Permanent Magnet Synchronous Machine Considering the Characteristics of Different Excitation Sources
Creators: Xiaoyu Liang
Mingqiao Wang*
Ping Zheng
Yong Liu* and Jialin Gao
Publisher: name: IEEE
Year: 2025

Permanent Magnet synchronous machine (PMSM) are widely used in fields such as new energy vehicles due to their high power and torque density. But the presence of permanent magnet (PM) field leads to a high back electromotive force at high speed. Many control strategies of flux-weakening (FW) have been proposed to further expand the speed under the inverter capacity. In the conventional machine, even the salient interior PMSM (IPMSM), its d-axis inductance is small for increasing reluctance torque [1]. For solving the above problem to improve FW ability, Flux-intensifying IPMSM (FI-IPMSM) has been proposed with higher d-axis inductance, speed and power [2]. However, the PM on d-axis and magnetic barrier on q-axis limit the further improvement of the power and FW ability. Based on the analysis of the characteristics of different excitation sources, it is necessary to research a novel FI-IPMSM that encompasses the above requirements. By changing their amplitude and phase relationship of excitation sources, the performance such as speed range and power can be improved based on the different excitation source interaction. The proposed novel asymmetric FI-IPMSM and its excitation source are shown in Fig. 1, where the d-axis flux path without low-permeability material greatly improves the inductance and FW ability. The shifting angle of PM can be adjusted to achieve the optimal design. The combined PM poles can achieve higher and more sinusoidal magnetic field of rotor, while the discrete armature magnetic field can better solve the power and speed limitation and uneven saturation through theoretical deduction. The schematic diagram of the torque and speed characteristics of the machine are shown in Fig. 2. Based on the research of excitation source superposition relationship, the machine can achieve higher speed and power. The more reasonable excitation and topology make the torque quality better than the conventional machine.References: [1] X. Zhu, J. Huang, and L. Quan, "Comprehensive Sensitivity Analysis and Multi-objective Optimization Research of Permanent Magnet Flux-Intensifying Motors," IEEE Transactions on Indus-trial Electronics, vol. 66, no. 4, pp. 2613-2627 (2019) [2] X. Zhao, B. Kou and C. Huang, "A Reverse-Salient Permanent Magnet Synchronous Motor and Its dq-Axis Current Distribution Laws," IEEE Transactions on Industrial Electronics, vol. 70, no. 4, pp. 3337-3347 (2023)
Permanent Magnet synchronous machine (PMSM) are widely used in fields such as new energy vehicles due to their high power and torque density. But the presence of permanent magnet (PM) field leads to a high back electromotive force at high speed. Many control strategies of flux-weakening (FW) have been proposed to further expand the speed under the inverter capacity. In the conventional machine, even the salient interior PMSM (IPMSM), its d-axis inductance is small for increasing reluctance torque [1]. For solving the above problem to improve FW ability, Flux-intensifying IPMSM (FI-IPMSM) has been proposed with higher d-axis inductance, speed and power [2]. However, the PM on d-axis and magnetic barrier on q-axis limit the further improvement of the power and FW ability. Based on the analysis of the characteristics of different excitation sources, it is necessary to research a novel FI-IPMSM that encompasses the above requirements. By changing their amplitude and phase relationship of excitation sources, the performance such as speed range and power can be improved based on the different excitation source interaction. The proposed novel asymmetric FI-IPMSM and its excitation source are shown in Fig. 1, where the d-axis flux path without low-permeability material greatly improves the inductance and FW ability. The shifting angle of PM can be adjusted to achieve the optimal design. The combined PM poles can achieve higher and more sinusoidal magnetic field of rotor, while the discrete armature magnetic field can better solve the power and speed limitation and uneven saturation through theoretical deduction. The schematic diagram of the torque and speed characteristics of the machine are shown in Fig. 2. Based on the research of excitation source superposition relationship, the machine can achieve higher speed and power. The more reasonable excitation and topology make the torque quality better than the conventional machine.References: [1] X. Zhu, J. Huang, and L. Quan, "Comprehensive Sensitivity Analysis and Multi-objective Optimization Research of Permanent Magnet Flux-Intensifying Motors," IEEE Transactions on Indus-trial Electronics, vol. 66, no. 4, pp. 2613-2627 (2019) [2] X. Zhao, B. Kou and C. Huang, "A Reverse-Salient Permanent Magnet Synchronous Motor and Its dq-Axis Current Distribution Laws," IEEE Transactions on Industrial Electronics, vol. 70, no. 4, pp. 3337-3347 (2023)