Contributions to the optimization of permanent magnet brushless DC motor control systems

Abstract

The main objectives of the thesis are: To present an overview of Brushless DC motor drive methods and sistems; To present a novel rotor initial position estimation method; To evaluate a new alternating freewheeling drive concept for BLDC motor driver three phased power inverters; To propose a complex BLDC motor driver ASIC architecture; To present a new hardware implemented field weakening drive of BLDC motors; To present a new speed sensor interface circuit with improved EMC performance;