SOLUTION

ADVANTAGES OF DC MOTORS:

Variable speed operation:- The attractive feature of the dc motor is that it offers a wide range of speed control both above and below the rated speeds. This can be achieved in dc shunt motors by methods such as the armature control method and field control method. This is one of the main applications in which dc motors are widely used in fine speed applications such as in rolling mills and in paper mills.

High starting torque: D.C series motors are termed as best suited drives for electrical traction applications used for driving heavy loads in starting conditions. DC series motors will have a starting torque as high as 500% compared to normal operating torque. Therefore dc series motors are used in the applications such as electric trains and cranes.

Accurate steep less speed with constant torque: Constant torque drive is one such drive that will have motor shaft torque constant over a given speed range. In such drives, shag power varies with speed. Quick starting, stopping, reversing and acceleration.

Free from harmonics, reactive power consumption, and many factors which make dc motors more advantageous compared to ac induction motors.