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Energies 2018, 11(11), 3219; https://doi.org/10.3390/en11113219

Cogging Torque Reduction Based on a New Pre-Slot Technique for a Small Wind Generator

1
Department of Electrical Engineering, University of Zaragoza, 50018 Zaragoza, Spain
2
For Optimal Renewable Energy Systems, S.L. (4fores), 50197 Zaragoza, Spain
*
Author to whom correspondence should be addressed.
Received: 18 October 2018 / Revised: 7 November 2018 / Accepted: 15 November 2018 / Published: 20 November 2018
(This article belongs to the Special Issue Permanent Magnet Synchronous Machines)
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Abstract

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. View Full-Text
Keywords: cogging torque; permanent magnet synchronous generator; small wind turbines; finite element method; renewable energy; energy conversion cogging torque; permanent magnet synchronous generator; small wind turbines; finite element method; renewable energy; energy conversion
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García-Gracia, M.; Jiménez Romero, Á.; Herrero Ciudad, J.; Martín Arroyo, S. Cogging Torque Reduction Based on a New Pre-Slot Technique for a Small Wind Generator. Energies 2018, 11, 3219.

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