Rafat Ali, Amjadullah, Salman Ali, Hamid Ullah
Axial flux Permanent magnet (AFPM) machines are popular due to their higher power density and reduced size. In recent years development of electrical drives and other direct drive applications, axial flux machines are gaining more attention. AFPM machines have a problem of cogging torque that needs to be tackled carefully. Cogging torque produces electrical noise and torque ripples. Power of an AFPM machine is directly proportional to its diameter, which makes cogging torque a sensitive design parameter. Cogging torque is proportional to the square flux and change in reluctance, with respect to its position to the stator. This paper paper explores various cogging torque reduction techniques.
Rafat Ali Amjadullah Salman Ali Hamid Ullah “Cogging-Torque Reduction Techniques in Axial Flux Permanent Magnet Machine” International Journal of Engineering Works Vol. 8 Issue 10 PP. 262-266 October 2021 https://doi.org/10.34259/ijew.21.8010262266.
[1] A. B. Letelier, D. A. Gonzalez, J. A. Tapia, R. Wallace and M. A. Valenzuela, "Cogging Torque Reduction in an Axial Flux PM Machine via Stator Slot Displacement and Skewing," in IEEE Transactions on Industry Applications, vol. 43, no. 3, pp. 685-693, May-june 2007, doi: 10.1109/TIA.2007.895738
[2] M. Aydin, Z. Q. Zhu, T. A. Lipo and D. Howe, "Minimization of Cogging Torque in Axial-Flux Permanent-Magnet Machines: Design Concepts," in IEEE Transactions on Magnetics, vol. 43, no. 9, pp. 3614-3622, Sept. 2007, doi: 10.1109/TMAG.2007.902818.
[3] D. A. Gonzalez, J. A. Tapia and A. Letelier Bettancourt, "Design Consideration to Reduce Cogging Torque in Axial Flux Permanent-Magnet Machines," in IEEE Transactions on Magnetics, vol. 43, no. 8, pp. 3435-3440, Aug. 2007, doi: 10.1109/TMAG.2007.899349.
[4] P. Kumar and R. K. Srivastava, "Cost-Effective Stator Modification Techniques for Cogging Torque Reduction in Axial Flux Permanent Magnet Machines," 2018 IEEE Transportation Electrification Conference and Expo, Asia-Pacific (ITEC Asia-Pacific), Bangkok, 2018, pp. 1-5, doi: 10.1109/ITEC-AP.2018.8433291
[5] Praveen Kumar and Rakesh Kumar Srivastava, "Influence of Rotor Magnet Shapes on Performance of Axial Flux Permanent Magnet Machines," Progress In Electromagnetics Research C, Vol. 85, 155-165, 2018. doi:10.2528/PIERC18041909
[6] Arand, Saadat & Ardebili, M.. (2016). Cogging torque reduction in axial-flux permanent magnet wind generators with yokeless and segmented armature by radially segmented and peripherally shifted magnet pieces. Renewable Energy. 99. 95-106. 10.1016/j.renene.2016.06.054.
[7] M. Aydin and M. Gulec, "Reduction of Cogging Torque in Double-Rotor Axial-Flux Permanent-Magnet Disk Motors: A Review of Cost-Effective Magnet-Skewing Techniques With Experimental Verification," in IEEE Transactions on Industrial Electronics, vol. 61, no. 9, pp. 5025-5034, Sept. 2014, DOI: 10.1109/TIE.2013.2276777
[8] Z. Q. Zhu and D. Howe, "Influence of design parameters on cogging torque in permanent magnet machines," in IEEE Transactions on Energy Conversion, vol. 15, no. 4, pp. 407-412, Dec. 2000, DOI: 10.1109/60.900501
[9] L. Hao, M. Lin, D. Xu, N. Li and W. Zhang, "Cogging Torque Reduction of Axial-Field Flux-Switching Permanent Magnet Machine by Rotor Tooth Notching," in IEEE Transactions on Magnetics, vol. 51, no. 11, pp. 1-4, Nov. 2015, Art no. 8208304, doi: 10.1109/TMAG.2015.2453340.
[10] Patel A N, Suthar B N. Double Layer Magnet Design Technique for Cogging Torque Reduction of Dual Rotor Single Stator Axial Flux Brushless DC Motor. IJEEE. 2020; 16 (1) :58-6