Abstract
Most renewable energy systems (RES) require a transmission to modify the input speed into the desired output speed. The solar systems drive trains include a speed reducer, while the wind turbines and hydro units’ usually contain a gearbox to increase the speed of the input shaft to the generator. The paper main objective is analyzing the conversion possibilities of a proposed planetary chain-set from speed reducer into a speed increaser, by inverting the energy flow. The transmission is meant to be used in the RES applications (small wind turbines and hydropower stations). By inverting the energy flow, the reducer can become speed increaser only if its efficiency is positive. Therefore, the variation of the kinematical ratio i (first as reducer and, then, as increaser) and the variation of the afferent efficiencies are further analyzed comparatively, in the paper. The results interpretation highlight the conditions in which the chain transmission can be used as speed reducer and speed increaser and form a data basis for choosing the proper solution of chain transmission for a certain application (in terms of teeth numbers and efficiency)
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