THE DYNAMIC BEHAVIOR OF DC LINK CURRENT WITH CONSTANT LOAD TORQUE USING MATLAB/SIMULINK

In this paper we have studied open loop modelling and analysis of separately excited dc motor drive. First, we have done its steady state analysis or non- linear analysis. A set of non-linear differential equations has been made and perturbation technique has been applied in it and its linear model has been developed using dc equivalent circuit model. These set of non-linear equations, analog model in terms of transfer function are developed. Variation in the performance of DC motor is studied how the firing angle changes while changing the speed and armature current. The dynamic model of separately excited dc motor drive has been developed with constant load torque used for loading purpose of dc motor. The non-linear differential equations describing the dynamics of the drive are linearized around steady state operating point using small perturbation technique, open-loop transfer function in s-domain are determined and further results are shown with the help of MATLAB.