WESD Wind Energy Science Discussions WESD Wind Energ. Sci. Discuss. 2366-7621 Göttingen, Germany 10.5194/wes-2020-101 Skewing angle magnet and coil reduced starting torque in a permanent magnet synchronous generator for a small vertical axis wind turbine Pongwan Priwan 1 Chalermnayanont Kusumal 2 Trongtorkarn Mintra 3 Jina Suppachai 1 Luengchavanon Montri https://orcid.org/0000-0001-8586-194X 4 Energy Technology Program, Faculty of Engineering, Prince of Songkla University, Hatyai, Songkhla 90110 Thailand Department of Electrical Engineering, Faculty of Engineering, Prince of Songkla University, Hatyai, Songkhla 90110 Thailand Department of Industrial Electrical Technology, Faculty of Science and Technology, Suratthani Rajabhat University, Suratthani 84100, Thailand Sustainable Energy Management Program, Faculty of Environmental Management, Prince of Songkla University, Hatyai, Songkhla 90110 Thailand Electricity Generating Authority of Thailand 61-F405000-11-IO.SS03F3008347 25 11 2020 2020 1 12 Copyright: © 2020 Priwan Pongwan et al. 2020 This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/ This article is available from https://wes.copernicus.org/preprints/wes-2020-101/ The full text article is available as a PDF file from https://wes.copernicus.org/preprints/wes-2020-101/wes-2020-101.pdf

<p>This work investigated the effects of changing the skewing angle of a magnet coil on starting torque in a permanent magnet generator (PMSG) fitted in a low speed vertical wind turbine. The optimal skew angle of the magnet-coil was found to be 15&ndash;0 (degrees), generating 1.22 (N-m) starting torque and 295.40 (W) compared with a skew angle of 0&ndash;0 (degrees). This skew angle reduced starting torque and power by 5.43&thinsp;% and 1.96&thinsp;%, respectively. A Savonius and H-Darrieus stacked turbine blade operated at a wind speed of 1.90&thinsp;m/s and 1.31 N-m torque. This blade was used in a fully operational vertical wind turbine, was connected to the PMSG that can cut-in speed of 2.1&thinsp;m/s. It was concluded that a 15&ndash;0 (degree) skewing angle magnet-coil can be applied to a low speed vertical wind turbine.</p>