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A triple 3-phase fault-tolerant fractional slot concentric winding interior permanent-magnet machine with low space harmonics

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Abstract

Fractional slot concentric winding (FSCW) machine features with short end winding, high torque density and good fault tolerance. However, this type of machine suffers from abundant MMF harmonics which causes high iron loss and partial saturation, etc. Hence, majority of the FSCW adopts surface-mounted PM (SPM) rotor which have large effective airgap to minimize the influence of the MMF harmonics while the interior PM (IPM) rotor is rarely used. The SPM rotor tends to induce high PM flux linkage and cause large fault current when experiencing a short-circuit failure. As a result, this paper presents a triple 3-phase FSCW-IPM for fault-tolerant applications. The triple 3-phase windings facilitate the uninterrupted fault tolerant operation, the more even distributed windings also induce a more sinusoidal MMF which enables the application of IPM rotor. The IPM rotor reduces the PM usage while reluctance torque can be explored to compensate the PM torque reduction which improves the machine fault tolerance. As a result, the proposed machine owns good performance and excellent fault tolerance. The machine is investigated by electromagnetic and thermal finite element analysis and prototyping tests. Both findings confirm that the proposed triple 3-phase FSCW-IPM is a competitive solution for high reliability application.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

This work was supported in part by the National Natural Science Foundation of China under Grant 52277035 and Grant 51937006; in part by Jiangsu Carbon Peak Carbon Neutralization Science and Technology Innovation Special Fund under Grant BE2022032-1. (Corresponding author: Bo Wang.)

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Authors and Affiliations

  1. School of Electrical Engineering, Southeast University, Nanjing, 210096, China

    Bo Wang, Zihan Wei, Haoyuan Yu, Ming Cheng & Wei Hua

  2. Department of Electronic and Electrical Engineering, The University of Sheffield, Sheffield, S1 3JD, UK

    Xiao Chen

Authors
  1. Bo Wang
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  2. Zihan Wei
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  3. Haoyuan Yu
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  4. Xiao Chen
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  5. Ming Cheng
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  6. Wei Hua
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Contributions

Wang Bo wrote the manuscript and conceived the research content, Wei Zihan and Yu Haoyuan checked the manuscript content, Cheng Xiao discussed the research content, Cheng Ming and Hua Wei participated in the analysis and verification of the research content, and all the authors reviewed the manuscript.

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Correspondence to Bo Wang.

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Wang, B., Wei, Z., Yu, H. et al. A triple 3-phase fault-tolerant fractional slot concentric winding interior permanent-magnet machine with low space harmonics. Electr Eng (2024). https://doi.org/10.1007/s00202-024-02292-0

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