Modelagem e acionamento de uma máquina de indução de seis fases com injeção harmônica para ganho de torque

Abstract

The vast majority of electric power generation systems, products and industrial processes use machines with a number of phases equal to three. The predominance of the three-phase system led to the more frequent use of three-phase machines. However, with the advancement of the semiconductor switches and the development of converters, the number of phases is no longer a limiting factor in the study and application of polyphase machines. It is possible to use machines with a number of phases higher than three and to obtain several advantages, such as: lower sensitivity to voltage unbalance, reduction of ripple frequency, reduction of bus voltage when associated to multilevel converters, reduction of current harmonics in the DC bus, increase of torque with injection of harmonic current, among others. This work presents the mathematical modeling of an asymmetric machine of six phases (taking into consideration constructive aspects) and study of the drive for gain of torque in third harmonic injection. From the study, the equations were implemented in a DSP, which performs the command of a converter by actuating the machine in the desired way, the velocity signals and waveforms of the currents are presented and compared with the results of simulation for validation of the theory.