2, Dc motor is an energy conversion device.
3. Dc machine can be made to work as a dc motor depending upon the input energy supplied.dc motor is extensively used in variable speed devices such as robotic device, printers, paper and textile industries and many others.
4. The reason is that speed-torque characteristic of dc motor is much more superior to that of a motor.
5. In most cases, separately excited type of motor is used because of the combination of the commutator within the motor. It is advantageous to convert alternating current into direct current.