Enhancing Performance of BLDC: An Improved Fast Terminal Slide Mode Control for BLDC Motor Speed Control

Abstract Due to their several merits over brushed DC motors, comprising their superior dynamic characteristics, higher efficiency, a slightly lower noise level, and their utilize of an electronic commutation unit rather than a mechanical one, a brushless direct current (BLDC) motors are in high demand in a wide range of applications. To optimize efficacy and performance, the optimal control method for a BLDC motor operating at different speeds or loads needs to be planned. The objective of this study is for improving the speed control method for BLDC motors operating at various loads or reference speeds. This work suggests an improved method to control the speed of BLDC motors by using the improved fast terminal slide mode control (IFTSMC) technique. With the help of simulation, the suggested strategy's efficiency is evaluated utilizing MATLAB/Simulink software. A comparison is made between the proposed methodology, the proportional integral derivative (PID), and the sliding mode control (SMC) approaches for demonstrating the superiority and robustness of the control method that is offered. In comparison to other methods, the suggested control approach has a lower overshoot value of 0.008%, while 13.1368% for the PID, and 1.3% under the SMC method. Finally, the proposed IFTSMC shows less steady state error (SSE) in the speed responses under all case studies where the SSE of IFTSMC is 0.116745 RPM and this value is better to that of the PID (3.609496 RPM) and SMC (5.316406 RPM).