A Direct Current (DC) Motor runs from a DC (Direct Current) source of electricity and the electricity runs at a constant voltage where as an AC (Alternating Current) Motor which runs on an oscillating supply with a fixed cycle between negative and positive. Batteries or a DC Drive produce DC current and power stations supply AC. The UK domestic supply is typically single phase 240V 50Hz AC and industrial supply is three phase 415V 50Hz AC. Both of these can be converted to DC using a suitable DC Drive.
The armature comprises a cylindrical iron core made of thin sheet stampings with a number of slots arranged along the outer periphery. The coils comprising the winding are fitted in these slots, being suitably insulated from each other and from the iron core. At one end of the armature winding is placed the commutator which consists of a number of copper segments built up into the form of a cylinder. These segments are insulated from each other and from the shaft. The current is fed into the armature by means of a series of carbon brushes pressing on the commutator and suitably connected to the machine terminals, the various commutator segments being connected to the corresponding armature conductors.