Experimental investigation of drivetrain resistance applied to small wind turbines

Moreira, Jouberson L.R.; Mesquita, Alexandre Luiz Amarante; Araujo, Leonam Ferreira de; Galhardo, Marcos André Barros; Vaz, Jerson Rogério Pinheiro; Pinho, João Tavares

doi:10.1016/j.renene.2020.02.014

Cited by 12 publications

(3 citation statements)

References 19 publications

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“…Recently, researchers have shown an increased interest in extracting the optimum energy from wind sources 1,2 . Recent developments in wind energies have also heightened the need for more investigation on direct‐coupled wind turbines (DCWTs) due to the elimination of gearbox 3,4 . DCWTs provide many advantages in terms of reliability, maintenance cost, and efficiency in comparison with geared types 5,6 .…”

Section: Introductionmentioning

confidence: 99%

“…1,2 Recent developments in wind energies have also heightened the need for more investigation on direct-coupled wind turbines (DCWTs) due to the elimination of gearbox. 3,4 DCWTs provide many advantages in terms of reliability, maintenance cost, and efficiency in comparison with geared types. 5,6 Nevertheless, owing to the lower speed of DCWTs, the generator of such types of turbines must be designed with a high torque density value to decrease the generator volume and weight.…”

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confidence: 99%

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Optimal design of a modular axial‐flux permanent‐magnet synchronous generator for gearless wind turbine applications

Ashrafzadeh,

Ghadimi,

Jabbari

et al. 2023

Wind Energy

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Air‐cored axial‐flux permanent‐magnet synchronous generators (AFPMSGs) are potential candidates for gearless direct‐coupled wind turbines (DCWTs) owing to providing high efficiency and power density. The design of a DCWT generator is so complicated since the generator cost, dimension, and weight affected by gear elimination. Therefore, it is essential to find an optimal AFPMSG design at rated conditions. In this paper, an accurate procedure for the optimal design of an air‐cored AFPMSG applicable for DCWTs is proposed. The genetic algorithm (GA) is used for multi‐objective design optimization to reach the optimal configuration as well as system dimension in order to decrease the weight, increase the power density and enhance the effectiveness of the generator. To validate the efficiency of the suggested optimization proceducer, a 30 kW AFPMSG has been considered as a case study. The results of optimization have been investigated by finite element analysis (FEA). A prototype generator is also fabricated, and the test results are offered and compared with the numerical study. The outcomes show that there exists an acceptable agreement between FEA and experimental outcomes with the error percentage about of 1.35%.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Optimal design of a modular axial‐flux permanent‐magnet synchronous generator for gearless wind turbine applications

Ashrafzadeh,

Ghadimi,

Jabbari

et al. 2023

Wind Energy

View full text Add to dashboard Cite

show abstract

“…e former can be used to generate relatively real data. However, it has the disadvantages of being time-consuming and expensive [15]. On the contrary, the BEM theory and CFD can generate diverse and reliable results with a low cost.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design and Aerodynamic Performance Prediction of a Horizontal Axis Small-Scale Wind Turbine

Yin

Xie

Yao

2022

Mathematical Problems in Engineering

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The improved aerodynamic design of a horizontal axis small-scale wind turbine blade is crucial to increasing the efficiency and annual energy production of the turbine. One of the vital stages in aerodynamic design is the selection of the airfoil. Using the existing airfoils for a blade design which results in higher turbine characteristics is tedious. Consequently, this paper provides an optimal design strategy for a horizontal axis small-scale wind turbine blade through the multiobjective optimization of the airfoil using the Nondominated Sorting Genetic Algorithm II (NSGA-II). The latter outperforms the other commonly used genetic algorithms (GAs), as well as the Computational Fluid Dynamics (CFD) investigation of the different airfoil types and the wind turbine rotors on the steady or unsteady state aerodynamic performance. An NACA4412 airfoil with higher aerodynamic efficiency is considered as a baseline for the optimization in order to increase the lift coefficient and lift to drag ratio while avoiding excessive variations in the maximum relative thickness and area. The optimized airfoil (NACA4412-OPT) is used as the cross-sectional profile in the design procedure for a novel 1.15 m diameter three-bladed wind turbine rotor at a wind speed of 11.5 m/s, tip speed ratio of 4.65, and pitch angle of 0.2° by the Wilson design method. The two-dimensional analysis demonstrates that the optimized airfoil outperforms the other airfoils yielding the highest lift coefficient and lift to drag ratio, as well as a larger pitch range. The three-dimensional analysis shows that the time-averaged power coefficient value (0.33) of the new wind turbine is almost 26% higher and more stable than that of the original wind turbine while avoiding a high increase of the axial thrust.

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Effect of bearing dissipative torques on the dynamic behavior of H-Darrieus wind turbines

Pinheiro

Filho

Vaz

et al. 2021

J Braz. Soc. Mech. Sci. Eng.

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Experimental investigation of drivetrain resistance applied to small wind turbines

Cited by 12 publications

References 19 publications

Optimal design of a modular axial‐flux permanent‐magnet synchronous generator for gearless wind turbine applications

Optimal design of a modular axial‐flux permanent‐magnet synchronous generator for gearless wind turbine applications

Optimal Design and Aerodynamic Performance Prediction of a Horizontal Axis Small-Scale Wind Turbine

Effect of bearing dissipative torques on the dynamic behavior of H-Darrieus wind turbines

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