Simulation Modeling of BLDC motor drive and harmonic analysis of stator current, rotor speed and acceleration using Discrete Wavelet Transform Technique

摘要

: A simulation model has been developed in this paper to study the behavioral characteristic of Brushless DC motor and also analyses the harmonics present in the stator current, rotor speed and acceleration of the BLDC drive circuit. Hence in order to improve the accuracy of the motor drive control system, we have introduced a de-noising module in the feedback path. This denoised signal is compared with the original one and the deviation (error) between these two signals is further rectified by the PI controller present in the forward path. All these analyses are achieved by using discrete wavelet transform (DWT). For simulation purpose, we have used MATLAB/SIMULINK based platform and developed the models of those motors in SIMULINK from mathematical expressions derived from working principles of motor. The purpose of the PI controller is to achieve good tracking to torque (i.e. angular acceleration). The acceleration is decomposed and denoised further by choosing Coif let as mother wavelet. The study of the denoised signal is discussed in detail.