Field Voltage Speed Control of DC Motors Based Foraging Strategy

The speed of separately excited DC motor (SEDM) can be controlled above rated speed using field control method. The chopper circuit is used to control field voltage for achieving the desired speed. This work presents design and simulation of field control system for controlling the SEDM speed. The chopper firing circuit receives signal from controllers and then chopper gives variable voltage to the field circuit of the motor for achieving desired speed. There are two control loops, one for controlling current consists of relay and another for speed which consists of rate feed back controller tuned using bacterial foraging optimization technique (BFO). Modeling of SEDM is done. The complete model of DC drive is simulated using MATLAB (SIMULINK). BFO technique plays a vital role in controller tuning which improves the controller performance by improving the transient and steady state specifications. Also this technique makes the controller robust for any load changing as shown from simulation results. The proposed method is very efficient and could easily be extended for other global optimization problems.

Keywords:

Chopper , MATLAB SIMULINK , Bacteria Foraging Optimization Algorithm (BFOA) , Separately Excited DC Motor (SEDM) , Rate Feedback Controller