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    Cogging Torque Mitigation using the Unequal Rotor Slot Arcs Method based on Magnetic Permeance Distribution for Flux-Switching Machines
    (Korean Institute of Electromagnetic Engineering and Science, 2025) Cetin, Emrah
    Permanent magnet machines, such as flux-switching permanent magnet (FSPM) machines, are characterized by cogging torque, which must be addressed because it leads to torque fluctuations. With permanent magnetics usually buried in the stator winding of FSPM machines, cogging torque occurs due to the mutual effects of the stator magnetic field and the rotor ferromagnetic material. In this study, the unequal rotor slot arc (URSA) method, which manipulates the magnetic permeance distribution (MPD) in the airgap, is employed to diminish the cogging torque. Furthermore, to demonstrate the effects of MPD, a mathematical model is developed. Parametric optimization is implemented to obtain the optimal cogging torque value that also maintains a convenient average torque output. The results show that the proposed URSA technique significantly reduces cogging torque. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. © Copyright The Korean Institute of Electromagnetic Engineering and Science.
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    Cogging torque reduction by utilizing the unequal rotor slot arc method for FSPM Machines
    (Elsevier, 2024) Cetin, Emrah
    Cogging torque is a crucial and offending problem for electric machines that consist permanent magnets. Flux switching permanent magnet (FSPM) machines have magnets embedded inside the stator coils. Due to the interaction between the stator magnetic flux and the rotor steel, cogging torque occurs. To express this interaction, Magnetic Permeance Distribution Model is implemented in this study. To minimize the cogging torque, unequal rotor slot arc (URSA) technique is developed and cogging torque is calculated by using finite element method. An optimization study is performed to get the minimum value of the cogging torque under reasonable output torque. Results prove that, the proposed URSA method have promising outcomes for cogging torque reduction.