Type Synthesis of Gear-box in Wind Turbine

Qiu, Jun; Liu, Boxing; Dong, Honggang; Wang, Delun

doi:10.1016/j.procs.2017.05.333

Cited by 15 publications

(9 citation statements)

References 2 publications

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“…The planetary speed increaser type is mainly used in high-power conventional wind systems and in counter-rotating turbines, due to their advantages: high amplification ratios, reduced radial sizes and better efficiency [1,3,16,17,[23][24][25][26][27][28][29][30][31][32]. With dual-rotor systems, the speed increaser, operating as a 2-DOF transmission, sums up the rotors' input speeds [26,30], while operating as a 1-DOF planetary transmission, it sums up the rotors' input torques [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

“…With dual-rotor systems, the speed increaser, operating as a 2-DOF transmission, sums up the rotors' input speeds [26,30], while operating as a 1-DOF planetary transmission, it sums up the rotors' input torques [31][32][33]. Qiu et al proposed in [23] a synthesis of planetary speed increasers mainly for high-power wind turbines, considering both 1-DOF and 2-DOF types.…”

Section: Introductionmentioning

confidence: 99%

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A Comparative Performance Analysis of Counter-Rotating Dual-Rotor Wind Turbines with Speed-Adding Increasers

et al. 2021

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Increasing the efficiency of wind power conversion into electricity poses major challenges to researchers and developers of wind turbines, who are striving for new solutions that can ensure better use of local wind potential in terms of both feasibility and affordability. The paper proposes a novel concept of wind systems with counter-rotating wind rotors that can integrate either conventional or counter-rotating electric generators, by means of the same differential planetary speed increaser, aiming at providing a comparative analysis of the energy performance of counter-rotating wind turbines with counter-rotating vs. conventional electric generators. To this end, a generalized analytical model for angular speeds and torques has been developed, which can be customized for both system configurations. Three numerical simulation scenarios have been contrasted: (a) a scenario with identical wind rotors in both systems, (b) a scenario with the secondary wind rotors being identical in the two applications, but different from the primary rotors, and (c) a scenario with different secondary rotors in the two wind turbines. The results have shown that the wind systems with counter-rotating generator are more efficient and have a higher amplification ratio, compared to systems with conventional generators. In addition, the analyzed wind system with a counter-rotating generator displays better energy performance with low values for output power and ratio of input speeds, whereas the wind turbine with a conventional generator proves to be more efficient in the high-value range of the above-mentioned parameters.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Comparative Performance Analysis of Counter-Rotating Dual-Rotor Wind Turbines with Speed-Adding Increasers

et al. 2021

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“…Over the years, research in the field of WTs has covered more and more issues regarding the improvement of their performance by introducing new concepts of WTs with variations in both shape and number of rotors and/or blades, by designing more efficient and downsized transmission systems of different types of WTs in terms of energy output [24,28,29,45]. The dynamic analysis of CRWTs is approached in [46,47], while numerical simulations of the aerodynamic performance of a CRWT are presented in [5,9,48,49].…”

Section: Introductionmentioning

confidence: 99%

Design and Simulation of a 1 DOF Planetary Speed Increaser for Counter-Rotating Wind Turbines with Counter-Rotating Electric Generators

2019

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The improvement of wind turbine performance poses a constant challenge to researchers and designers in the field. As a result, the literature presents new concepts of wind turbines (WTs), such as: counter-rotating wind turbines (CRWTs) with two coaxial wind rotors revolving in opposite directions, WTs with higher-efficiency and downsized transmission systems, or WTs with counter-rotating electric generators (CREGs). Currently, there are a few solutions of WTs, both containing counter-rotating components; however, they can only be used in small-scale applications. Aiming to extend the use of WTs with counter-rotating wind rotors (CRWRs) and CREGs to medium- and large-scale applications, this paper introduces and analyzes a higher-performance WT solution, which integrates two counter-rotating wind rotors, a 1 degree of freedom (DOF) planetary speed increaser with four inputs and outputs, and a counter-rotating electric generator. The proposed system yields various technical benefits: it has a compact design, increases the output power (which makes it suitable for medium- and large-scale wind turbines) and allows a more efficient operation of the electric generator. The kinematic and static computing methodology, as well as the analytical models and diagrams developed for various case studies, might prove useful for researchers and designers in the field to establish the most advantageous solution of planetary speed increasers for the CRWTs with CREGs. Moreover, this paper extends the current database of WT speed increasers with an innovative concept of 1 DOF planetary gearbox, which is subject to a patent application.

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“…In regard to the gearbox for WT conversion systems, several types of speed increasers are presented in the literature: spur or bevel gear trains [6,20,21], planetary gear train or combined solutions [16,[22][23][24][25][26][27][28][29][30][31][32][33], variable-ratio gearboxes [34] and a hybrid transmission including a planetary gear train and a control system, designed for a variable-speed WT [35]. The dynamic behavior of a combined planetary and spur gear type speed increaser under different internal and external excitations, based on a four degrees of freedom (DOF) dynamic model, is presented in [36].…”

Section: Introductionmentioning

confidence: 99%

“…Although most research in the field either discusses the effects of design parameters on the aerodynamic performances of a wind turbine and its power output or draws comparisons between different types of systems in terms of energy production, only a few papers partially favor the WT conversion system design [5,30,34,35].…”

Section: Introductionmentioning

confidence: 99%

Conceptual Synthesis of Speed Increasers for Wind Turbine Conversion Systems

2018

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Most wind turbines (WT) are of the single-rotor type, which means they are simple, reliable and durable, but unlikely to convert more than 40% of the available wind energy. Different solutions are proposed to minimize WT energy loss and improve performance, such as the use of speed increasers, counter-rotating wind rotors or counter-rotating electric generators. Downsizing the design, saving weight and reducing the cost of WT conversion systems, while increasing their efficiency, have posed constant challenges to WT designers. Nevertheless, very little research in the field is concerned with, and partially recommends, the design of conversion systems. Therefore, the aim of this paper is to propose a specific algorithm for the conceptual synthesis of speed increasers integrated in WT conversion systems, starting with an inventory of all combinations of the main components of a conversion system that prove compatible for efficient functioning. The algorithm is structured in two sections: the first one includes a four-step approach to WT system design, while the second one follows a three-step procedure for identifying the speed increaser concept. Twenty-two variants of speed increasers are further generated and analyzed, four of which are innovative solutions proposed by the authors. The paper also provides guidelines for identifying the WT conversion system concept according to the circumstances of its application.

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Type Synthesis of Gear-box in Wind Turbine

Cited by 15 publications

References 2 publications

A Comparative Performance Analysis of Counter-Rotating Dual-Rotor Wind Turbines with Speed-Adding Increasers

A Comparative Performance Analysis of Counter-Rotating Dual-Rotor Wind Turbines with Speed-Adding Increasers

Design and Simulation of a 1 DOF Planetary Speed Increaser for Counter-Rotating Wind Turbines with Counter-Rotating Electric Generators

Conceptual Synthesis of Speed Increasers for Wind Turbine Conversion Systems

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