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Investigation on Non-Uniform Teeth Application in Counter-Rotating Axial-Flux Hybrid-Excitation Permanent Magnet Machine With Low Cogging Torque
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DOI：10.1109/TEC.2025.3647702.png)
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Abstract
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The counter-rotating axial-flux hybrid-excitation permanent magnet (PM) machine is a novel power device specifically designed for counter-rotating propeller (CRP) systems. Cogging torque (CT) can induce vibrations and noise, adversely affecting its dynamic performance and stealth characteristics, necessitating strict suppression. However, the variable-flux and consequent-pole (CP) structure obscure the characteristics of the CT, leading to a lack of a clear theoretical basis for its suppression. To address this challenge, this paper investigates CT suppression in the counter-rotating axial-flux hybrid-excitation PM machines using non-uniform teeth (NUT) and comprehensively analyzes the implementation consequences. Firstly, a general CT model of the counter-rotating axial-flux hybrid-excitation PM machine is established, and the fundamental principles of NUT are derived. Subsequently, the constraints required to achieve a beneficial effect while preventing phase-phase asymmetry are proposed. Furthermore, the impact of the proposed method on the electromagnetic performance of counter-rotating axial-flux hybrid-excitation PM machine is examined, leading to the formulation of optimal angle allocation principles and recalculation of the winding factor. Finally, theoretical analysis is validated through experimental results, demonstrating that the research work effectively guides the application of NUT and enhances the robustness of counter-rotating axial-flux hybrid-excitation PM machine in CRP drive systems.
Keywords:
Permanent magnet (PM) machines
propellers
torque measurement
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