en Electrical Machines Design-1 Electrical Machines Design Research Paper Research Paper Permanent-Magnet Synchronous Generators (PMSGs) exhibit high efficiency and power density, and have already been employed in gearless wind turbines. In the gearless wind turbines, due to the removal of the gearbox, the cogging torque is an important issue. Therefore, in this paper, at first, design of a Permanent-Magnet Synchronous Generator for a 2MW gearless horizontal-axis wind turbine, according to torque-speed and capability curves, is presented. For estimation of cogging torque in PMSGs, an analytical method is used. Performance and accuracy of this method is compared with the results of Finite Element Method (FEM). Considering the effect of dominant design parameters, cogging torque is efficiently reduced. Permanent-Magnet Synchronous Generator,Power Coefficient,Magnetic Voltage,Cogging Torque, 52 60 http://ijeee.iust.ac.ir/browse.php?a_code=A-10-1176-2&slc_lang=en&sid=1 A. Darijani ahaddarijani@gmail.com 180031947532846003252 180031947532846003252 No the Department of Electrical Engineering, Faculty of Engineering, University of Isfahan A. Kiyoumarsi kiyoumarsi@eng.ui.ac.ir 180031947532846003253 180031947532846003253 Yes the Department of Electrical Engineering, Faculty of Engineering, University of Isfahan H. A. Lari heidar.ali.lari@gmali.com 180031947532846003254 180031947532846003254 No the Department of Electrical Engineering, Faculty of Engineering, University of Isfahan B. Mirzaeian Dehkordi mirzaeian@eng.ui.ac.ir 180031947532846003255 180031947532846003255 No the Department of Electrical Engineering, Faculty of Engineering, University of Isfahan Sh. Bekhrad shbekhrad@yahoo.com 180031947532846003256 180031947532846003256 No the Department of Electrical Engineering, Faculty of Engineering, University of Isfahan S. Rahimi Monjezi 180031947532846003257 180031947532846003257 No the Department of Electrical Engineering, Faculty of Engineering, University of Isfahan