Study of a Spoke-Type Ferrite Structure as an Alternative to Surface-Mounted NdFeB PMSGs: A Performance Comparison Based on Getting the Same Efficiency

AbstractA spoke-type permanent magnet synchronous generator (PMSG) with ferrite magnets that could be an alternative to a PMSG with 2 kW, 20-poles, surface-mounted NdFeB magnets with the same power, the number of poles and efficiency value was designed in this study. The designs obtained by the finite element analysis were compared in terms of size, magnet properties, flux distributions, cogging torque, induced voltages, total harmonic distortion, and active material costs. The amount of magnet used in the ferrite magnet generator was approximately 2.7 times that of N38 to obtain the same power. While the active volume (D2L) of the ferrite magnet generator was obtained as approximately twice that of a surface-mounted neodymium magnet, the total generator cost was 1.45 times less in the ferrite magnet structure. When evaluated in terms of their performance, the cogging torques were obtained at approximately the same value, and the voltage harmonics were obtained at lower values in the spoke-type generator.Keywords: wind energyNdFeB magnetferrite magnetpermanent magnet synchronous generator DISCLOSURE STATEMENTNo potential conflict of interest was reported by the authors.Additional informationNotes on contributorsCemil OcakCemil Ocak was born in Turkey in 1985. He received his M.Sc., and Ph.D. degrees from the Institute of Science and Technology, Gazi University, Ankara, Türkiye, in 2009, and 2013, respectively. He joined the Department of Electrical and Electronics Engineering of Gazi University, in 2022 as an Assistant Professor. He has been actively involved with many state and industry-funded projects in the areas of design, analysis, and testing of electrical machines. He has several publications in journals and has presented research outcomes at relevant conferences. His research interests include computer-aided design and geometry optimization of electrical machines.Adem DalcaliAdem Dalcali received the B.Sc. and M.Sc. degrees from Gazi University, Ankara, Turkey, in 2010 and 2013, respectively, and the Ph.D. degree in electric and electronics engineering from Karabük University, Karabük, Turkey, in 2017. From 2013 to 2017, he was a Research Assistant with the Department of Electric and Electronics Engineering, Karabük University. He is currently an Associate Professor with the Department of Electrical-Electronics Engineering, Bandırma Onyedi Eylül University, Bandırma, Turkey. His research interests include wind energy and the numerical analysis of the electromagnetic field in electrical machinery.

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