Freio de Foucault Aplicado à Medição de Potência em Turbina Eólica Savonius / Eddy Brake Applied to Power Measurement in Wind Turbine Savonius
DOI:
https://doi.org/10.34117/bjdv7n2-074Keywords:
Savonius turbine, Foucault dynamometer, wind tunnel, torque and power measurement, instrumentation.Abstract
In this work is proposed the design of a dynamometer based on Foucault's Current Break for the evaluation of torque and power provided by a Savonius wind turbine model in a wind tunnel. The applied measurement system is of the open source type using the Arduino platform. For the reaction force metering a load cell with converter and amplifier H711 was used as well as a photoelectric sensor with resolution of one pulse per turn for the rotation measurement. Equations available in the literature were used to estimate the wind turbine performance parameters for the dynamometer sizing. The wire applied for magnetic flux generation in the coils is AWG24, to support an electrical current rating of 0.5 A and a voltage of 1.0 V. The coils size are 3.1 cm of diameter and 3.0 cm of length. Two coils were applied in order to satisfy the wind turbine demand. As a result, the dimensional characteristics of an eddy current brake able to measure a power of up to 0.5 W, generated by a Savonius wind turbine, were obtained, with uncertainty of measurement about 0.01 W, being adequate for the analyzed turbine.
References
Alé, Jorge A. V. (2012). Small Wind Turbines Workshop, Pontifícia Universidade Católica do Rio Grande do Sul – PUCRS, Porto Alegre/RS.
Beckwith, T.G.; Marangoni, R.D.; Leinhard, J.H. (1993). Mechanical Measurements. Reading: Addison-Wesley, 5th edition.
Burton, Tony et al. (2011). Wind energy handbook. John Wiley & Sons.
Castro, G. G. P, Oliveira E. F., Vieira L. E. S., Santos M. M., Desenvolvimento e construção de um gerador eólico com eixo vertical Development and construction of a vertical axis wind generator. https://www.brazilianjournals.com/index.php/BRJD/article/view/5012/4609
Chapman, S.J. (2013). Fundamentos de Máquinas Elétricas. AMGH Editora. Rio Grande do Sul.
Chetvorno. (2015). A diagram showing how a disk-type eddy current brake works. Wikipedia Commons. Disponível em: https://en.wikipedia.org/wiki/File:Eddy_current_brake_diagram.svg; Acesso em 01/05/2020.
Halliday, D., Resnick, R. and Walker, J. (2009). Fundamentos de Física. Vol. 3: Eletromagnetismo. Editora LTC.
König, Feliz Von. Windenergie in praktischer Nutzung: Ra?der, Rotoren, Mu?hlen, Windkraftwerke. Pfriemer; 2., durchges. u. erw. Aufl edition, 1978.
Micco, F. K.; Rech, C.; Schneider, P. S. (2017). Methodology evaluation for the design of a Foucault Brake. 24th International Congress of Mechanical Engineering. Curitiba.
Pereira, A. H. (2006). Freio eletromagnético para ensaios de motores elétricos de indução. Dissertação (Programa de Pós-Graduação). Curso de Engenharia Elétrica. Universidade Federal do Ceará. Fortaleza.
Plint, M, A & Martyr, A. (1997). Engine Testing Theory and Practice. Butterworth-Heinemann.
Redemet, Rede de Meteorologia do Comando da Aeronáutica (2020). Tabela Climatológica 2001-2010 do Aeroporto Internacional Salgado Filho (SBPA). Porto Alegre/RS. Disponível em: redemet.aer.mil.br. Acessado em 01 de maio de 2020.
Zhi-Ding et. al. (2010). Analysis of simulation design of the disc eddy current braking device. International Conference on Computer, Mechatronics, Control and Electronic Engineering (CMCE). Institute of Railway & Urban Rail Transit. Tongji University. Shangai. China.
Wouterse, J. H.. Critical torque and speed of eddy current brake with widely separated soft iron poles. Electric Power Applications, IEE Proceedings B; vol. 138, no. 4, pp.153-158, jul. 1991
