VP21-01 A Novel Double-sided PM Flux Modulated Machine with Hybrid Magnet Arrangement
Creators: Hong Chen
YaoMeng
DaweiLi
RonghaiQu and Yixiao Zhang
Publisher: name: IEEE
Year: 2025

I. Introduction Permanent magnet vernier machines (PMVMs) exhibit significantly high torque density taking advantage of the multiple working harmonics. To further improve the magnet utilization and torque density, the dual-side PMs vernier machine with magnets placed in both stator and rotor sides has been a research spot in recent years [1]. This paper proposes a novel dual-side PM vernier machine (DPMVM) with hybrid excitation, in which the radial and tangential excited PMs are adopted. The torque generation mechanism and performance evaluation of the proposed DPMV machine are investigated by finite element analysis (FEA). II. Machine Topology and Operation Principle The topology of the proposed DPMVM is illustrated in Fig.1. It can be found that both the stator and rotor of the proposed DPMVM have consequent-pole radial-excited-PM arrangements forming doubly salient structures. In addition, two tangential excited PMs with opposite magnetization directions are placed on the sides of each split-tooth. The operation principle of the DPMVM is based on the flux modulation effect, and several low-order harmonic components in the modulated airgap flux field are produced, contributing to multiple torque contents to enlarge the torque density of the DPMVM. III. Performance Evaluation The flux density and flux line distributions of the proposed DPMVM are analyzed in Fig. (a) and (b), respectively. It can be seen that the saturation effect is slight, and the modulated 2nd-order harmonic is produced. Fig. 2 (c) and (d) investigate the no-load airgap flux densities produced by the stator-PMs, rotor-PMs, and dual-PMs. It can be observed that the working harmonics consist of modulated components and conventional component. Fig.2(e) investigates the phase back-EMF waveforms produced by the stator-PMs, rotor-PMs, and dual-PMs excitations. The RMS values of the corresponding back-EMFs are 10.2V, 12.0V and 18.1V. Furthermore, Fig. (f) analyzes the rated torques. It can be calculated that the average torques produced by the stator-PMs, rotor-PMs, and dual-PMs excitations are 14.2Nm, 15.5Nm, and 26.6Nm. The full paper will present more detailed design considerations and electromagnetic performance investigation results.References: [1] Y. Li, H. Yang, H. Lin,W. Liu, and X. Zhao, “Torque generation mechanism and performance evaluation of a dual-sided PM machine with stator U-Shaped magnets,” IEEE Trans. Ind. Appl., vol. 58, no. 1, pp. 250–260, Jan./Feb. 2022.
I. Introduction Permanent magnet vernier machines (PMVMs) exhibit significantly high torque density taking advantage of the multiple working harmonics. To further improve the magnet utilization and torque density, the dual-side PMs vernier machine with magnets placed in both stator and rotor sides has been a research spot in recent years [1]. This paper proposes a novel dual-side PM vernier machine (DPMVM) with hybrid excitation, in which the radial and tangential excited PMs are adopted. The torque generation mechanism and performance evaluation of the proposed DPMV machine are investigated by finite element analysis (FEA). II. Machine Topology and Operation Principle The topology of the proposed DPMVM is illustrated in Fig.1. It can be found that both the stator and rotor of the proposed DPMVM have consequent-pole radial-excited-PM arrangements forming doubly salient structures. In addition, two tangential excited PMs with opposite magnetization directions are placed on the sides of each split-tooth. The operation principle of the DPMVM is based on the flux modulation effect, and several low-order harmonic components in the modulated airgap flux field are produced, contributing to multiple torque contents to enlarge the torque density of the DPMVM. III. Performance Evaluation The flux density and flux line distributions of the proposed DPMVM are analyzed in Fig. (a) and (b), respectively. It can be seen that the saturation effect is slight, and the modulated 2nd-order harmonic is produced. Fig. 2 (c) and (d) investigate the no-load airgap flux densities produced by the stator-PMs, rotor-PMs, and dual-PMs. It can be observed that the working harmonics consist of modulated components and conventional component. Fig.2(e) investigates the phase back-EMF waveforms produced by the stator-PMs, rotor-PMs, and dual-PMs excitations. The RMS values of the corresponding back-EMFs are 10.2V, 12.0V and 18.1V. Furthermore, Fig. (f) analyzes the rated torques. It can be calculated that the average torques produced by the stator-PMs, rotor-PMs, and dual-PMs excitations are 14.2Nm, 15.5Nm, and 26.6Nm. The full paper will present more detailed design considerations and electromagnetic performance investigation results.References: [1] Y. Li, H. Yang, H. Lin,W. Liu, and X. Zhao, “Torque generation mechanism and performance evaluation of a dual-sided PM machine with stator U-Shaped magnets,” IEEE Trans. Ind. Appl., vol. 58, no. 1, pp. 250–260, Jan./Feb. 2022.