Cogging torque reduction based on a new pre-slot technique for a small wind generator

García Gracia, Miguel (Universidad de Zaragoza) ; Jiménez Romero, Ángel (Universidad de Zaragoza) ; Herrero Ciudad, Jorge ; Martín Arroyo, Susana (Universidad de Zaragoza)

Resumen: 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.

Idioma: Inglés

DOI: 10.3390/en11113219

Año: 2018

Publicado en: Energies 11, 11 (2018), 3219 [15 pp.]
ISSN: 1996-1073

Factor impacto JCR: 2.707 (2018)

Categ. JCR: ENERGY & FUELS rank: 56 / 103 = 0.544 (2018) - Q3 - T2

Factor impacto SCIMAGO: 0.612 - Control and Optimization (Q1) - Electrical and Electronic Engineering (Q1) - Renewable Energy, Sustainability and the Environment (Q1) - Energy Engineering and Power Technology (Q1) - Energy (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/ES/MINECO/RTC-2016-5234-3

Tipo y forma: Article (Published version)

Área (Departamento): Área Ingeniería Eléctrica (Dpto. Ingeniería Eléctrica)