A study of rare-earth magnet profiles for torque ripple improvement of axial flux permanent magnet machine
ISSN: 0332-1649
Article publication date: 16 July 2024
Abstract
Purpose
The purpose of this study is to reduce the cogging torque in axial flux permanent magnet (AFPM) machine using optimal magnet shape.
Design/methodology/approach
This study analyzes different magnet shapes for AFPM machine performance enhancement. Three-dimensional (3D) finite element analysis is performed to see the effects of pole shaping on the cogging torque of the AFPM machine.
Findings
The magnetic pole shape has a significant effect on cogging torque and overall efficiency. The conventional model has the highest torque whereas the conventional skewing affected cogging torque positively and significantly reduced the cogging torque. The combination of skewing the pole along with face curving is more effective and decreases the cogging torque from 3.88 Nm to 1.5 Nm.
Originality/value
Rare-earth magnets are the most expensive and important part of AFPM machines. Shape and volume optimization of rare-earth magnets is crucial for the performance of AFPM machines. The research aims to analyze the different permanent magnet designs for performance improvement of the AFPM machine. Conventional flat top trapezoidal, curved-top and skewed-magnet shapes are analyzed and the performance of the AFPM machine is compared with different magnet shapes. Curved-top shape and skewed magnet significantly reduce the cogging torque. Furthermore, a combination of curved-top shape and skew magnet shape is proposed to reduce the cogging torque further and improve the AFPM machine’s overall performance. Newly proposed magnet profile gives skewed curve magnet shapes which reduce the cogging torque further. 3D finite element analysis has been used to analyze the single-sided AFPM with all four different magnet shapes. The research focuses on single-sided AFPM machines, but the results are also valid for double-sided AFPM machines and can be extended to other topologies of AFPM machines.
Keywords
Acknowledgements
Erratum: It has come to the attention of the publisher that the article Ali, S., Qadeer, N., Ciprini, L. and Marignetti, F. (2024), “A study of rare-earth magnet profiles for torque ripple improvement of axial flux permanent magnet machine”, COMPEL – The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/COMPEL-06-2023-0212 contained a error in the acknowledgments section. This error was introduced during the production process. “This study was carried out within the MOST – Sustainable Mobility Center and received funding from the European Union Next-GenerationEU (PIANO NAZIONALE DI RIPRESA E RESILIENZA (PNRR) – MISSIONE 4 COMPONENTE 2, INVESTIMENTO 1.4 – D.D. 1033 17/06/2022, CN00000023). This manuscript reflects only the authors’ views and opinions: neither the European Union nor the European Commission can be considered responsible for them. The authors also acknowledge the financial support from the Innovation Agreement Contract ‘ULISSE, sUstainable rolLIng Stock to inSpire the nExt’. Decree of the Ministry of Enterprises and Made in Italy 31.12.2021 and Hitachi Rail Spa.” has now been removed from the acknowledgements section. The correct acknowledgement is as follows: The authors acknowledge the support of the project “Development and optimization of a high-efficiency sea wave electrical power generator”, CUP H53D23007410001, project P2022SY7LH, financed by EU in NextGenerationEU plan through the Ministry of University and Research (MUR) within the framework of the PRIN 2022 PNRR “Scientific Research Programmes of Outstanding National Interest”. The publisher sincerely apologises for this error and for any confusion caused.
This study was carried out within the MOST – Sustainable Mobility Center and received funding from the European Union Next-GenerationEU (PIANO NAZIONALE DI RIPRESA E RESILIENZA (PNRR) – MISSIONE 4 COMPONENTE 2, INVESTIMENTO 1.4 – D.D. 1033 17/06/2022, CN00000023). This manuscript reflects only the authors’ views and opinions: neither the European Union nor the European Commission can be considered responsible for them. The authors also acknowledge the financial support from the Innovation Agreement Contract” ULISSE, sUstainable rolLIng Stock to inSpire the nExt”. Decree of the Ministry of Enterprises and Made in Italy 31.12.2021 and Hitachi Rail Spa.
The authors acknowledge the support of the project “Development and optimization of a high-efficiency sea wave electrical power generator”, CUP H53D23007410001, project P2022SY7LH, financed by EU in NextGenerationEU plan through the Ministry of University and Research (MUR) within the framework of the PRIN 2022 PNRR “Scientific Research Programmes of Outstanding National Interest”.
Citation
Ali, S., Qadeer, N., Ciprini, L. and Marignetti, F. (2024), "A study of rare-earth magnet profiles for torque ripple improvement of axial flux permanent magnet machine", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/COMPEL-06-2023-0212
Publisher
:Emerald Publishing Limited
Copyright © 2024, Emerald Publishing Limited