76089 20200117221617.0 doi 10.3390/en11113219 sideral 109276 ART-2018-109276 eng (orcid)0000-0002-5727-5705 García Gracia, Miguel Universidad de Zaragoza Cogging torque reduction based on a new pre-slot technique for a small wind generator 2018 Access copy available to the general public Unrestricted Cogging torque is a pulsating, parasitic, and undesired torque ripple intrinsic of the design of a permanent magnet synchronous generator (PMSG), which should be minimized due to its adverse effects: vibration and noise. In addition, as aerodynamic power is low during start-up at low wind speeds in small wind energy systems, the cogging torque must be as low as possible to achieve a low cut-in speed. A novel mitigation technique using compound pre-slotting, based on a combination of magnetic and non-magnetic materials, is investigated. The finite element technique is used to calculate the cogging torque of a real PMSG design for a small wind turbine, with and without using compound pre-slotting. The results show that cogging torque can be reduced by a factor of 48% with this technique, while avoiding the main drawback of the conventional closed slot technique: the reduction of induced voltage due to leakage flux between stator teeth. Furthermore, through a combination of pre-slotting and other cogging torque optimization techniques, cogging torque can be reduced by 84% for a given design. info:eu-repo/grantAgreement/ES/MINECO/RTC-2016-5234-3 info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 2.707 2018 ENERGY & FUELS 56 / 103 = 0.544 2018 Q3 T2 0.612 2018 Control and Optimization 2018 Q1 Electrical and Electronic Engineering 2018 Q1 Renewable Energy, Sustainability and the Environment 2018 Q1 Energy Engineering and Power Technology 2018 Q1 Energy (miscellaneous) 2018 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion (orcid)0000-0002-3157-0239 Jiménez Romero, Ángel Universidad de Zaragoza Herrero Ciudad, Jorge (orcid)0000-0002-7008-7610 Martín Arroyo, Susana Universidad de Zaragoza 5009 535 Universidad de Zaragoza Dpto. Ingeniería Eléctrica Área Ingeniería Eléctrica 11, 11 (2018), 3219 [15 pp.] ENERGIES Energies 1996-1073 6427404 http://zaguan.unizar.es/record/76089/files/texto_completo.pdf Versión publicada 108565 http://zaguan.unizar.es/record/76089/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:76089 articulos driver 2020-01-17-21:51:43 ARTICLE