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dc.contributor.authorNeagoe, Mircea
dc.contributor.authorSaulescu, Radu
dc.contributor.authorJaliu, Codruta
dc.contributor.authorSimionescu, Petru A.
dc.date.accessioned2021-10-21T16:14:04Z
dc.date.available2021-10-21T16:14:04Z
dc.date.issued2020-09-03
dc.identifier.citationNeagoe, M., Saulescu, R., Jaliu, C. and Simionescu, P.A., 2020. A Generalized Approach to the Steady-State Efficiency Analysis of Torque-Adding Transmissions Used in Renewable Energy Systems. Energies, 13(17), p.4568.en_US
dc.identifier.urihttps://hdl.handle.net/1969.6/89845
dc.description.abstractThe 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.en_US
dc.language.isoen_USen_US
dc.publisherMDPIen_US
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectwind energyen_US
dc.subjectmarine-currenten_US
dc.subjecthydro poweren_US
dc.subjectplanetary gearen_US
dc.subjectefficiency analysisen_US
dc.titleA generalized approach to the efficiency analysis of torque-adding transmissions used in renewable energy systemsen_US
dc.typeArticleen_US
dc.creator.orcidhttps://orcid.org/0000-0003-1243-5725en_US
dc.creator.orcidhttps://orcid.org/0000-0003-4506-510Xen_US
dc.creator.orcidhttps://orcid.org/0000-0002-5217-0170en_US
dc.creator.orcidhttps://orcid.org/0000-0003-0181-7277en_US
dc.creator.orcidhttps://orcid.org/0000-0003-1243-5725
dc.creator.orcidhttps://orcid.org/0000-0003-4506-510X
dc.creator.orcidhttps://orcid.org/0000-0002-5217-0170
dc.creator.orcidhttps://orcid.org/0000-0003-0181-7277
dc.identifier.doihttps://doi.org/10.3390/en13174568


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Attribution 4.0 International
Except where otherwise noted, this item's license is described as Attribution 4.0 International