Cogging Torque Reduction Based on a New Pre-Slot Technique for a Small Wind Generator
AbstractCogging 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
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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.
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(11):3219.Chicago/Turabian Style
García-Gracia, Miguel; Jiménez Romero, Ángel; Herrero Ciudad, Jorge; Martín Arroyo, Susana. 2018. "Cogging Torque Reduction Based on a New Pre-Slot Technique for a Small Wind Generator." Energies 11, no. 11: 3219.
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