A typical dc motor today uses 2 poles.
Since direct-current lighting power distribution networks already existed for direct current lighting, DC motors were the first form of motor that was widely employed.
A DC motor's speed can be varied widely by changing either the supply voltage or the amount of current flowing through its field windings. Appliances, toys, and gadgets frequently have small DC motors.
The universal motor, a small brushed motor used in portable power tools and appliances, can be run on direct current.
Larger DC motors are being used for electric vehicle propulsion, elevator and hoist propulsion, and drives for steel rolling mills.
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