D.C. Motor

Speed Control of DC Series Motor - Flux & Rheostatic Control

In a dc motor, speed will depend on armature current and field voltage. So to control dc motor  speed, field voltage or armature current should be changed.      In a dc series motor or universal motor, the speed is indete…

Speed Control of DC Motors - shunt & series

Industrial as well as domestic loads need speed variation. Some of the loads require to change the speed in steps and some of the motors require to change the speed uniformly. For instance, in the paper industry, while ro…

Torque Equation of a DC Motor

Torque or moment or moment of force is the tendency of a force to rotate or move an object about an axis. A force is a push or pull, likewise, torque is a twist to an object. Mathematically, Torque, T = F × r. Let T g…

Back E.M.F of DC Motor and Equation

What is Back E.M.F. in DC Motor :      When the armature of a d.c. motor rotates, the windings or conductors on the armature also rotate in the magnetic field. According to " Faraday's Laws of Electro-Magnetic Indu…

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