VP5-02 Field-Collaborative-Modulated Design and Investigation for a High Torque Performance Permanent Magnet Vernier Machine
Creators: Xutao Wang
Zixuan Xiang
Xue Zhou
Yuting Zhou
Kunhua Chen and Xiaoyong Zhu
Publisher: name: IEEE
Year: 2025

Permanent magnet Vernier (PMV) machines possess remarkable advantages in terms of their capability for low-speed and high-torque operations, thereby demonstrating significant potential for direct-drive applications [1]. Due to the phenomenon of magnetic gear effect, this particular type of motor showcases a wide array of harmonic components within its airgap magnetic field, which predominantly facilitates energy transfer through these harmonics. Consequently, the torque capability of such motors is prominently evident. However, it should be duly noted that the presence of these magnetic field harmonics also impacts certain performance aspects including torque pulsation, losses and so on [2]. Actually, the harmonics of airgap magnetic field in the PMV machines are engendered by the process of permeability modulating the MMF of both the armature and PM, which is comprehensively elucidated by the emergence, continuous refinement, and ongoing development of the unified theory of magnetic field modulation [3]. In other words, the modulation behavior of the magnetic field is the pivotal factor in determining the harmonic characteristics of the airgap. Mastering the process of exploring and guiding this modulation behavior is crucial for effectively enhancing the airgap harmonic characteristics of permanent magnet motors, thereby achieving performance improvement. This paper proposes a novel field-collaborative-modulated design for permanent magnet vernier machines, wherein the key lies in considering the magnetic field modulation behavior as both synchronous and asynchronous modulation behaviors. Based on this, a harmonic-oriented design approach is further investigated for improving the torque performances. Fig. 1 shows the motor topology and the synchronous and asynchronous modulation process. The flux density characteristics and torque performances are also analyzed, as shown in Fig. 2. It can be seen that the torque performances are improved effectively by utilizing the field-collaborative-modulated design. Building on this foundation, the full paper will provide more detailed analysis and experimental verification.References: [1] Z. Xiang, J. Wei and X. Zhu, “Torque ripple suppression of a pm vernier machine from perspective of time and space harmonic magnetic field,” IEEE Trans. Ind. Electron., vol. 71, no. 9, pp. 10150-10161, Sept. 2024. [2] L. Xu, Z. Sun and W. Zhao, “Stator core loss analysis and suppression of permanent magnet vernier machines,” IEEE Trans. Ind Electron., vol. 70, no. 12, pp. 12155-12167, Dec. 2023. [3] M. Cheng, H. Wen, P. Han and X. Zhu, “Analysis of airgap field modulation principle of simple salient poles,” IEEE Trans. Ind. Electron., vol. 66, no. 4, pp. 2628-2638, Apr. 2019.
Permanent magnet Vernier (PMV) machines possess remarkable advantages in terms of their capability for low-speed and high-torque operations, thereby demonstrating significant potential for direct-drive applications [1]. Due to the phenomenon of magnetic gear effect, this particular type of motor showcases a wide array of harmonic components within its airgap magnetic field, which predominantly facilitates energy transfer through these harmonics. Consequently, the torque capability of such motors is prominently evident. However, it should be duly noted that the presence of these magnetic field harmonics also impacts certain performance aspects including torque pulsation, losses and so on [2]. Actually, the harmonics of airgap magnetic field in the PMV machines are engendered by the process of permeability modulating the MMF of both the armature and PM, which is comprehensively elucidated by the emergence, continuous refinement, and ongoing development of the unified theory of magnetic field modulation [3]. In other words, the modulation behavior of the magnetic field is the pivotal factor in determining the harmonic characteristics of the airgap. Mastering the process of exploring and guiding this modulation behavior is crucial for effectively enhancing the airgap harmonic characteristics of permanent magnet motors, thereby achieving performance improvement. This paper proposes a novel field-collaborative-modulated design for permanent magnet vernier machines, wherein the key lies in considering the magnetic field modulation behavior as both synchronous and asynchronous modulation behaviors. Based on this, a harmonic-oriented design approach is further investigated for improving the torque performances. Fig. 1 shows the motor topology and the synchronous and asynchronous modulation process. The flux density characteristics and torque performances are also analyzed, as shown in Fig. 2. It can be seen that the torque performances are improved effectively by utilizing the field-collaborative-modulated design. Building on this foundation, the full paper will provide more detailed analysis and experimental verification.References: [1] Z. Xiang, J. Wei and X. Zhu, “Torque ripple suppression of a pm vernier machine from perspective of time and space harmonic magnetic field,” IEEE Trans. Ind. Electron., vol. 71, no. 9, pp. 10150-10161, Sept. 2024. [2] L. Xu, Z. Sun and W. Zhao, “Stator core loss analysis and suppression of permanent magnet vernier machines,” IEEE Trans. Ind Electron., vol. 70, no. 12, pp. 12155-12167, Dec. 2023. [3] M. Cheng, H. Wen, P. Han and X. Zhu, “Analysis of airgap field modulation principle of simple salient poles,” IEEE Trans. Ind. Electron., vol. 66, no. 4, pp. 2628-2638, Apr. 2019.