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SPECIFIC FEATURES OF A COUNTER-ROTATING TRANSMISSION FOR RENEWABLE ENERGY SYSTEMS
Autori: Codruta Jaliu, Oliver Climescu, Radu Saulescu
Data aparitiei: August/2011
Revista: Environmental Engineering and Management JournalVol. 10Nr. 8
ISSN: 1843 - 3707
Pret: 25.00 RON    
N.A.
Abstract:
A specific topical issue both for small hydropower plants and wind turbines refers to the discrepancy between the relatively low
speed of the water turbine/wind rotor and relatively high speed of the electric generator: the turbine/rotor has higher performances
at lower speeds, while the generator performances are increasing with the speed. Usually, this problem can be solved connecting a
proper speed increaser between the turbine (increaser input) and generator (increaser output). Besides, the gearboxes used in the
renewable energy systems (R.E.S.) allow generating the necessary electric energy while functioning at lower values of wind
speeds or water flows. The paper presents and analyzes cinematically and dynamically a counter-rotating system that contains two
coaxial turbines and a generator, connected through a bevel-planetary gear with two inputs (the two turbines) and one output (the
generator). The system works relatively different from other drive trains used in the renewable energy systems, while having a
much improved efficiency. Firstly, the kinematical and dynamic parameters of the planetary transmission are established in the
paper. Then, a case study of a small hydropower plant equipped with a counter-rotating transmission that multiplies 5 times the
input speed is analyzed. The numerical simulation results are analyzed in comparison with the classical solutions and
recommendations concerning the use of counter-rotating systems are settled up.


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