Direct torque control of three-phase brushless DC motor using PI controller

In this paper, in order to improve system performance, this study provides a thorough analysis of a three-phase brushless DC motor (BLDCM) and the use of Direct Torque Control (DTC) enhanced with a PI controller. An examination of the many kinds of electric motors and their history is the first step in the job. After that, it goes into detail regarding three-phase brushless DC motor, which are frequently utilized in industry due to their durability, effectiveness, and ease of maintenance. A thorough mathematical model of the three-phase brushless DC motor is provided, including key variables like torque, synchronous speed, and equivalent circuit representation. In order to understand the motor's dynamic behavior, the study also examines its properties, particularly the torque-speed relationships. The main focus of this research is DTC, a high-performance control strategy that directly controls stator flux and electromagnetic torque without needing complicated transformations. Different DTC methods are talked about, with their pros and cons. A Proportional-Integral PI controller is added to the DTC scheme to fix problems like torque ripple and make control more accurate. Using MATLAB/Simulink, we can simulate the proposed DTC-PI system. The results show that speed tracking has gotten better, dynamic response has gotten better, oscillations have gotten smaller, and stability has gotten better when the load changes. The study finds that using DTC with PI control makes induction motor drives work much better than using traditional methods.