Sustainable Communities

Vişa, Ion; Duţă, Anca; Moldovan, Macedon; Burduhos, Bogdan; Neagoe, Mircea

doi:10.1007/978-3-030-34829-8_6

Cited by 2 publications

(2 citation statements)

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“…The major research has looked at energy-conversion efficiency for the purpose of maximizing the use of the onsite renewable potential. Moreover, in the case of wind and hydro-power systems of medium and high capacity, power is transmitted from the wind or water turbine to the electric generator via a speed increaser, which amplifies the speed of the turbine shaft approximately three times in case of hydro-electric systems, and by around one hundred in 2 of 18 case of wind power systems [5][6][7]. The best performing speed increasers in use, are one degree of freedom (1-DOF) or two degrees of freedom (2-DOF) planetary transmissions, which achieve higher efficiency, higher transmission ratios and smaller overall sizes than fixed-axis transmissions.…”

Section: Introductionmentioning

confidence: 99%

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A Generalized Approach to the Steady-State Efficiency Analysis of Torque-Adding Transmissions Used in Renewable Energy Systems

et al. 2020

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The paper presents a general approach to the steady-state efficiency analysis of one degree of freedom (1-DOF) speed increasers with one or two inputs, and one or two outputs, applicable to wind, hydro and marine-current power generating systems. The mechanical power flow, and the efficiency of this type of complex speed increasers, are important issues in the design and development of new power-generating systems. It is revealed that speed increases, with in-parallel transmission of the mechanical power from the wind or water rotors to the electric generator, have better efficiency than serial transmissions, but their efficiency calculus is still a challenging problem, solved in the paper by applying the decomposition method of complex speed increasers into simpler component planetary gear sets. Therefore, kinematic, steady-state torque and efficiency equations are derived for a generic 1-DOF speed increasers with two inputs and two outputs, obtained by connecting in parallel two gear mechanisms. These equations allow any speed increaser to be analysed with two inputs and one output, with one input and two outputs, and with one input and one output. We discuss a novel design of a patent-pending planetary-gear speed increaser, equipped with a two-way clutch, which can operate (in combination with the pitch adjustment of the rotors blades) in four distinct configurations. It was found that the mechanical efficiency of this speed increaser in the steady-state regime is influenced by the interior kinematic ratios, the input-torque ratio and by the meshing efficiency of its individual gear pairs. The efficiency of counter-rotating dual-rotor systems was found to be the highest, followed by systems with counter-rotating electric generator, and both have higher efficiency than conventional systems with one rotor and one electric generator with fixed-stator.

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Section: Introductionmentioning

confidence: 99%

“…Energies 2020, 13, x FOR PEER REVIEW 2 of 18 in case of wind power systems [5][6][7]. The best performing speed increasers in use, are one degree of freedom (1-DOF) or two degrees of freedom (2-DOF) planetary transmissions, which achieve higher efficiency, higher transmission ratios and smaller overall sizes than fixed-axis transmissions.…”

Section: Introductionmentioning

confidence: 99%