Estruturas estáticas alternativas para acionamento de motores de indução.

Abstract

Over the years, power electronics has introduced large advances in induction motor drive systems. One of these advances is the improvement of the electromechanical conversion process. This Ph.D Dissertation covers the analysis and development of alternative topologies, reduced component count or fault tolerance capability, taking into account the use of variable speed drives for induction motors. Besides the reduced component topologies, this work proposes a MOSPET-based multilevel inverter as a cost effective low power system. The system's characteristics are given taking into account the control technique of the inverter and the type of induction motor. The motor type is considered due to the possibility of operating a two winding motor, derived from a regular three-phase machine, operating with an open-phase or a two-phase motor. The latter includes the option for a two-winding single-phase motor with two-phase operational mode capability. A detailed analysis for each system will be presented taking into account the asymmetrical aspects introduced by either the component reduction or the motor type.