Enhanced Speed Regulation of BLDC Motors via Dual PID Control and Cascaded Buck-Boost Converter

Abstract

Brushless motors (BLDC) are enjoying a remarkable boom in many sectors, including industry and automotive, thanks to their reliability, high energy efficiency, and durability. Increasingly, they are establishing themselves as a modern, high-performance alternative to conventional DC motors. Their operating principle is based on a three-phase voltage-source inverter (VSI), which replaces mechanical brushes with electronic commutation, thus reducing wear and increasing overall system efficiency. Against this background, this paper proposes the modeling and analysis of a system combining a BLDC motor and a buck-boost converter, cascaded together, with the aim of providing precise motor speed control. Two PID controllers are used: one to stabilize the converter output voltage, the other to regulate the motor speed. System performance was evaluated using Matlab/Simulink simulations. The results clearly demonstrate the effectiveness of the control strategy, capable of maintaining a stable, responsive speed even in the presence of disturbances such as load or supply variations