Speed Control of DC Motor Using Chopper

The speed control of separately excited dc motor is carried out by varying the armature voltage for below rated speed and by varying field flux to achieve speed above the rated speed. This thesis presents the speed control methodology by varying armature voltage using chopper by providing control signal to the switches. Speed can be controlled from below and up to rated speed .The firing circuit of chopper receives signal from controller and variable voltage is given to the armature of dc motor according to the desired speed .There are two controllers we are using here one is speed controller and other is current controller. Both controllers are of proportional -integral type .The reason behind using PI type controller is it removes the delay and provide fast control. Now the simulation of model is done and analyzed in MATLAB (Simulink) under varying speed and torque condition.