DC MOTOR CONTROL USING CHOPPER

This paper deals with DC motor control in a high performance manner. The DC motor control system is designed and performed using a chopper circuit. The four different parts of control of DC motors will be considered here. Using chopper as a converter the speed of DC motor is controllable. The chopper firing circuit gets signal from controller and then by supplying variable voltage to the armature of the motor the desired speed chopper is achieved. There are two different types of control loops, current controller and speed controller. The controller used is Proportional-Integral type. Using this controller the delay is removed and fast control is achieved. Separately excited DC motor is designed and the complete layout of DC drive mechanism is achieved. The current and speed controller is designed and in order to get stable and high speed control of DC motor, the speed controller is optimized using modulus hugging method. After obtaining the entire model of DC drive system, the model is utilized with MATLAB (SIMULINK). DC motor drive is computer simulated and analyzed under various speeds and load torques.