A Comprehensive Study on Speed Control of DC Motor with Field and Armature Control

The aim of this paper is to describe the principle of DC motor speed control using armature control methods and field control methods and stopping the DC series motor immediately in case of emergency. For the armature control mode, the field current is held constant and an adjustable voltage is applied to the armature. In the field control mode, the armature voltage is held constant and an adjustable voltage is applied to the field. The speed variation of series motor by armature control method requires that voltage applied to the armature terminals shall be changed, without alternating the field current. In field control method the field is weaken and strengthen according to the requirement. The mathematical model of a separately excited DC motor (SEDM) with independent armature/filed control can be obtained by considering the electrical system, electromagnetic interaction and mechanical system. The main idea behind this paper is to understand how the speed of the Dc series motor can be controlled by armature and field control method.