Chattering Analysis of an Optimized Model Free Sliding Mode Controller for a DC Motor Speed Control

Abstract

The purpose of this study is to examine the chattering phenomenon in DC motor speed control technique using Model Free Sliding Mode Controller (MFSMC). The method used is to manipulate the swithing tnah function and swithing sign function in the Grey Wolf Optimizer (GWO) model and Velocity Aided Grey Wolf Optimizer (VAGWO) algorithm. The model is analysed by MATLAB and SIMULINK programs through control model and DC motor model. The study results show that chattering of DC motor speed control is greatly eliminated by using the hyperbolic tangent function (tanh) instead of the signum function. Therefore, it can be concluded that the performance of MFSMC can be greatly improved by manipulating the switching function. The tanh switching function in motor speed control can affect Gradual Change so as to reduce the possibility of sudden or drastic changes in control output that can cause chattering, besides the tangent switching function can help reduce system sensitivity to disturbances or noise. The use of MFSMCs with hyperbolic switching functions can lead to an increase in the lifetime of electric motors, and improve the reliability of power quality in grid systems.