Estimação Online da Resistência de Estator em Máquinas de Indução com Terminais Centrais Abertos

Abstract

Monitoring the motor performance in the industry is important to ensure that energy is efficiently used. Thus, the search for more efficient systems has driven the development of new technologies and electrical machine drive topologies. In this context, the configuration of the Open-End Winding Induction Machine emerged, which proposes to feed the machine by two converters, one at each end of the machine winding. This configuration has several advantages over the conventional one such as higher reliability, lower dc-link voltage, and three-level operation capability. It is possible to use two isolated d.c. links, one for each inverter or a single shared dc link. However, zero sequence currents can flow in the configuration where the two converters share the same bus. This current, unwanted in some applications, can be used here, with advantages, to on-line estimate the machine stator resistance. This parameter is important, among others, in implementing high-performance control techniques, efficiency, and winding temperature monitoring. Mathematical modeling is initially developed. Then, the feasibility, operability, and performance of the method are evaluated through simulations.