DC motor which has three main components

Motor DC 2Pole

Motor DC current, as the name implies, uses direct current indirect / direct-unidirectional. DC motors are used in special applications where high torque is required ignition or acceleration is fixed for a broad range of speed. Figure 3 shows a DC motor which has three main components:

Pole field. In simple illustrated that the interaction of two magnetic poles will cause the rotation of the DC motor. DC motor has a stationary field poles and armature that moves bearing on the space between the polar terrain. Simple DC motor has two field poles: north pole and south pole. Lines of magnetic energy through the enlarged openings between the poles from north to south. For larger motors or more complex consists of one or more electromagnets. Electromagnet to receive electricity from outside resources as a provider of field structure.

Pole field

Dynamo. When the flow goes through the armature, then this flow will be an electromagnet. A cylindrical armature, connected to the countershaft to drive the load. For the case of a small DC motor, the armature rotates in a magnetic field formed by the poles, to the north and south magnetic poles switch location. If this happens, the current is turned to change the poles of north and south of the dynamo.

DC motors are available in many sizes, but their use is generally restricted to some use of low-speed, low power usage to moderate, such as machine tools and rolling mills, because often there are problems with mechanical electric current changes direction at a larger size. Also, the motor is restricted only for use in the area is clean and not dangerous because the risk of sparks at the brush. DC motors are also relatively expensive compared to AC motors.

The relationship between speed, field flux and armature voltage is shown in the following equation:

Electromagnetic force: E = KΦN

Torque: T = KΦIa

Where:

E = electromagnetic force developed at the armature terminals (volts) Φ = flux field which is proportional to the flow field N = speed in RPM (revolutions per minute) T = electromagnetic torque He = armature current K = constant equation