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Torque Density Design Optimization of Rotating Pole Piece Concentric Magnetic Gear

  • Research Article-Electrical Engineering
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Abstract

Concentric magnetic gear (CMG) can achieve a torque density of more than 150 kN m/m3 through several modifications of the original structure and the removal of material volume. However, the complexity of such a system may be impractical to assemble and realize. CMG with an alternative condition where the pole piece acts as the outer rotor can deliver higher torque instead of outer pole pair on the same structure. This unconventional condition was known since CMG inception, but it inherits the problem similar to the reluctance machine of high torque ripple. In this paper, a considerably high torque density rotating pole piece magnetic gear is proposed. Several pole pair combinations were evaluated that could yield the highest torque density at lower torque ripple. The best pole pair combination was then optimized through the width reduction of three elements, namely the pole piece, the inner yoke and the outer yoke. By enhancing the structure with the best pole pair combination, the highest torque density achieved was 364.5 kNm/m3. At the same time, the torque ripple was ably kept at below 15%. Unlike other complex structures that yield high torque density, the proposed structure is simpler, easier to assemble and hence should be more cost effective to be produced.

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Acknowledgements

The authors would like to thank the Centre for Research and Innovation Management, Universiti Teknikal Malaysia Melaka (UTeM) and Universiti Tun Hussein Onn for the technical and financial support provided for this research.

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Authors and Affiliations

  1. Research Center for Applied Electromagnetics, Faculty of Electrical and Electronic Engineering, Universiti Tun Hussein Onn Malaysia (UTHM), Parit Raja, Batu Pahat, Johor, Malaysia

    M. F. M. A. Halim, E. Sulaiman & R. Aziz

  2. Centre for Robotics and Industrial Automation, Fakulti Kejuruteraan Elektrik Universiti Teknikal Malaysia Melaka (UTeM), Durian Tunggal, Melaka, Malaysia

    M. F. M. A. Halim, R. N. F. K. R. Othman & A. A. Rahman

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  1. M. F. M. A. Halim
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  2. E. Sulaiman
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Correspondence to M. F. M. A. Halim.

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Halim, M.F.M.A., Sulaiman, E., Aziz, R. et al. Torque Density Design Optimization of Rotating Pole Piece Concentric Magnetic Gear. Arab J Sci Eng 47, 2797–2806 (2022). https://doi.org/10.1007/s13369-021-05812-3

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