Normatização, linhas comerciais e operação ótima de motores de indução trifásicos

Abstract

In order to contribute to the efficient consumption of electric energy, this work presents a history and a brief summary of the methods of optimization of induction motors. The main regulations in force in Brazil and in the world (such as IEC and NEMA) are also presented, highlighting the most relevant topics, such as efficiency classes, and analyzing the differences between them. The performance levels of rotating electric machines manufactured by four large companies (WEG, Siemens, Baldor and Voges) are compared to those established by Brazilian legislation. The higher efficiency solutions are analyzed with reference to the market in the country. Then permanent magnet motors are presented as even more efficient alternatives to industrial drives, although more expensive. The optimum operating conditions for some MIT's were also analyzed. As a result, it has been found that higher performance levels can be achieved for induction machines driven by frequency inverters compared to those working with classical control. This optimization results in considerable reductions in energy costs and in the better use of this input.