Sistema de controle para motores BLDC utilizando técnica six step com controle de velocidade visando tração veicular

Abstract

Climate changes and the increased focus on the use of renewable resources rekin dled the internacional comunity’s interest in electrical traction as a counterpoint to the popular internal combustion systems. Over the last two decades, several topologies have been implemented making use of a combination of electric and combustion motors, called hybrid vehicles, or through the exclusive use of the electrical portion, called purely electric vehicles. In these, inductive motors, synchronous permanent magnets and reluctance were used, with each topology presenting advantages at different points. Among these, Brusless DC motors are an interesting alternative due to their high power density and efficiency, in addition to the ease and low cost linked to their control, mainly related to the absence of field windings, trapezoidal wave presented by its counter electromotive force and the possibility of using Hall effect sensors to obtain the rotor position, proving to be an extremely versatile option. In this manner, this undergraduate thesis will present the development and implementation of a control system for external rotor Brushless DC motor using the Six Step technique with and without closed loop speed control. The different modes of implementation of the technique will be discussed, with operation using the 120o conduction principle. In addition to the original technique, a closed loop control system will be developed in order to automate the process of adjusting the rotor speedaccording to stipulated references, thus increasing the robustness of the system. Finally,experimental results obtained from simulation will be presented, in order to validate thetheory and compare the results obtained with and without the use of closed loop.