DC Motors

A DC motor is any of a class of electrical machines that converts direct current electrical power into mechanical power. The most common types rely on the forces produced by magnetic fields. Nearly all types of DC motors have some internal mechanism, either electromechanical or electronic, to periodically change the direction of current flow in part of the motor. Most types produce rotary motion; a linear motor directly produces force and motion in a straight line.

A direct current (DC) motor is a fairly simple electric motor that uses electricity and a magnetic field to produce torque, which causes it to turn. At its most simple, it requires two magnets of opposite polarity and an electric coil, which acts as an electromagnet. The repellent and attractive electromagnetic forces of the magnets provide the torque that causes the motor to turn.

Anyone who has ever played with magnets knows that they are polarized, with a positive and a negative side. The attraction between opposite poles and the repulsion of similar poles can easily be felt, even with relatively weak magnets. A DC motor uses these properties to convert electricity into motion. As the magnets within the motor attract and repel one another, the motor turns

TYPES OF DC MOTOR

1. Permanent Magnet DC Motor
2. Separately Excited DC Motor
3. Self Excited DC Motor
4. Shunt Wound DC Motor
5. Series Wound DC Motor
6. Compound Wound DC Motor
7. Cumulative compound DC motor
8. Short shunt DC Motor
9. Long shunt DC Motor
10. Differential Compound DC Motor
11. Short Shunt DC Motor
12. Long Shunt DC Motor