Design and Analysis of Oil-Immersed Cooling Stator With Nonoverlapping Concentrated Winding for High-Power Ironless Stator Axial-Flux Permanent Magnet Machines

Liu, Ye; Zhang, Zhuoran; Wang, Chen; Geng, Weiwei; Yang, Tao

Abstract

Ironless stator axial-flux permanent magnet (AFPM) machines provide many attractive electromagnetic performances such as high efficiency in high-frequency mode and strong short-term overload ability, which make them more competitive in flywheel energy storage applications. However, designing high-torque-density AFPM machines, particularly their ironless stators, is with significant challenges and needs great efforts. In this article, a high-strength oil-immersed cooling stator with nonoverlapping concentrated winding is proposed for high-power ironless stator AFPM machine applications. This article explains in detail the design, analysis, and manufacturing process of the proposed oil-immersed cooling stator. With the three-dimensional finite-element analysis (3-D FEA), a 9000-r/m/50-kW 12-slot/10-pole prototype for a flywheel energy storage system is successfully designed and developed using the proposed high-strength oil-immersed cooling ironless stator. The experimental test results demonstrate the effectiveness of the cooling design and mechanical strength.

Citation

Liu, Y., Zhang, Z., Wang, C., Geng, W., & Yang, T. (2021). Design and Analysis of Oil-Immersed Cooling Stator With Nonoverlapping Concentrated Winding for High-Power Ironless Stator Axial-Flux Permanent Magnet Machines. IEEE Transactions on Industrial Electronics, 68(4), 2876-2886. https://doi.org/10.1109/tie.2020.2978694

• Journal Article Type: Article
• Acceptance Date: Feb 16, 2020
• Online Publication Date: Mar 11, 2020
• Publication Date: 2021-04
• Deposit Date: Dec 11, 2024
• Journal: IEEE Transactions on Industrial Electronics
• Print ISSN: 0278-0046
• Electronic ISSN: 1557-9948
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 68
• Issue: 4
• Pages: 2876-2886
• DOI: https://doi.org/10.1109/tie.2020.2978694
• Keywords: Axial-flux PM (AFPM) machine , high speed , ironless stator , mechanical strength , oil-immersed forced cooling
• Public URL: https://nottingham-repository.worktribe.com/output/5157588
• Publisher URL: https://ieeexplore.ieee.org/document/9032366/keywords#keywords