Comparative analysis and optimization design of dual-side-permanent-magnet Halbach array vernier machine for high torque density
ISSN: 0332-1649
Article publication date: 9 August 2024
Issue publication date: 5 September 2024
Abstract
Purpose
The purpose of this paper is to introduce and analyze a dual-side-permanent-magnet Halbach array vernier (DSPMHV) machine and to propose methods for achieving high torque density.
Design/methodology/approach
Flux harmonics and torque characteristics are analyzed by using finite element analysis. First, a suitable pole-slot combination is selected by comparison. Second, field modulation processes of DSPMHV machine are analyzed to identify the reason for high torque density. And it is compared with dual-side-PM (DSPM) machine to analyze flux harmonic and verify the flux concentrating effect of the Halbach array.
Findings
The permanent magnet (PM) field of the DSPM machine is approximately equal to the superposition of stator-PM field and rotor-PM field, which is the reason for high torque density. And the Halbach array can reduce flux leakage and increase the amplitude of main flux harmonics, then further improves torque. Improvement of torque can be achieved by choosing right pole-slot combination, adopting DSPM machine structure, reducing flux leakage and adopting field modulation principle.
Originality/value
The DSPMHV machine with split-tooth is proposed in this paper by combining the Halbach array with DSPM structure. This paper analyzes the bidirectional field modulation process, the reason for high torque density of the DSPM machine is obtained. Comparison with the DSPM machine verifies the flux concentrating effect of Halbach array. To alleviate the magnetic saturation in part of stator teeth, this paper proposes an improved DSPMHV machine with shaped auxiliary magnet.
Keywords
Acknowledgements
This work was supported by the Xuzhou special projects for promoting scientific and technological innovation, China (Grant No. KC22046), and the Natural Science Foundation of Jiangsu Province, China (Grant No. BK20231500).
Citation
Cheng, H., Lin, F., Wu, J. and Zhang, T. (2024), "Comparative analysis and optimization design of dual-side-permanent-magnet Halbach array vernier machine for high torque density", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 43 No. 5, pp. 1049-1066. https://doi.org/10.1108/COMPEL-03-2024-0149
Publisher
:Emerald Publishing Limited
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