1. Department of Electrical Engineering, Federal University of Juiz de Fora, Juiz de Fora 36036-900, Brazil
2. Department of Industrial and Mechanical Engineering, Federal University of Juiz de Fora, Juiz de Fora 36036-900, Brazil
3. Federal Center of Technological Education of Rio de Janeiro (CEFET/RJ), Rio de Janeiro 20271-110, Brazil