DC Machines

DC machines are an electro‐mechanical energy conversion device that uses DC power as input and/or DC output. A DC machine is a general term that refers to both the DC motor and DC generator. Two main components of a DC machine are stator and rotor. Stator is the stationary part and rotor is the rotating part. Under Faraday’s electromagnetic induction rules, when a conductor is put in a particular magnetic field, the conductor produces an electromotive force (emf). The commutation on the DC machine, or more specifically, the commutation in the DC generator, is the process where the generated alternating current in the winding is converted into a direct current of the DC machine. Armature windings are mainly of two types – lap winding and wave winding. Lap winding is the winding in which successive coils overlap each other. The DC generator armature can be represented by an electric circuit equivalent.