12 th International Research/Expert Conference ”Trends in the Development of Machinery and Associated Technology” TMT 2008, Istanbul, Turkey, 26-30 August, 2008 ON THE USE OF THE VAUCANSON PLANETARY TRANSMISSION IN THE RENEWABLE ENERGY SYSTEMS. PART II: POWER CIRCULATION AND EFFICIENCY Dorin Diaconescu Transilvania University of Brasov B-dul Eroilor No 29, Brasov Romania Mircea Neagoe Transilvania University of Brasov B-dul Eroilor No 29, Brasov Romania Codruta Jaliu Transilvania University of Brasov B-dul Eroilor No 29, Brasov Romania Radu Săulescu Transilvania University of Brasov B-dul Eroilor No 29, Brasov Romania ABSTRACT The paper main objective is to model and analyze the properties of the Vaucanson planetary transmission for using it as reducer or amplifier in the renewable energy systems. The power circulation and the efficiency of the initial Vaucanson reducer are presented in the second part of the paper. On the basis of the presented properties, useful conclusions for the use of the transmission in renewable energy systems are formulated. Keywords: Vaucanson planetary transmission, power circulation, efficiency 1. INTRODUCTION The structural characterization, the kinematical and static features of the planetary reducer of Vaucanson type are presented in the first part of the paper. The results are further used in the transmission dynamic modeling. Thus, the reducer power circulation and efficiency are modeled, analyzed and optimized in this second part of the paper with the aim of using the considered transmission in renewable energy systems, either as speed amplifier or speed reducer. 2. MODELING OF THE POWER CIRCULATION AND EFFICIENCY On the basis of the results, obtained in part I, for the reduced angular speeds and for the reduced torques, there can be established the power theoretical circulation (without friction) and the power real circulation (with friction). The following values for the branches of the power theoretical circulation are obtained from relations (3) and (6) from part I: ( )( ) 0 22 22 1 5 5 < − = − + = ω T (output power for unit 2); ( )( ) 0 22 3 25 23 20 4 4 > + = + + = ω , T (input power for unit 2); ( )( ) 0 23 23 1 6 6 > + = + + = ω T (input power for unit 3); ( )( ) 0 23 3 25 22 20 7 7 < − = + − = ω , T (output power for unit 3); ( )( ) 0 23 3 25 22 20 1 1 > + = − − = ω , T (input power for unit 1); ( )( ) 0 22 3 25 23 20 3 3 < − = − + = ω , T (output power for unit 1); ( ) ( ) 0 1 6 50 6 50 1 < − = + − = ω , , T H H (output power for unit 1); (1) 1153