High Performance Rectifier/Multilevel Inverter Based BLDC Motor Drive with PI Controller

Abstract

BLDC motor has many applications in high power systems. Whereas, it is easy to construct and design, cheap and needs less maintenance, with high efficiency, high output power, and high torque. By taking advantage of power electronics drives, a rectifier/multi-level inverter can improve the operation of BLDC motor in medium and high applications. In this research, a mathematical model of BLDC motor drive by rectifier/MLI has been simulated using Matlab/Simulink. Whereas, a proposed model system was built, with a two-part motor drive circuits: a three-phase full-wave fully controlled rectifier, and a three-level inverter. The pulses circuit is designed for rectifier and three-level inverter individually using PWM. Also, THD in the output of a three-level inverter has been reduced by using a modern SFO-PWM topology. In addition, the system is equipped with a PI controller to control the speed and torque of BLDC motor. Also, there is a high-quality control upon the speed and torque of the motor due to the use of PI controller, which resulted in constant torque with low ripple and constant speed as a load of the motor changed, with a high increasing in the stability and reliability of the system.