The alternating current components are given different ratings, such as double polarity motors, because they have the capability to operate at two different speeds in relation to their power, and double-spindle motor, which has only one output for each side. DC motors, also called DC motors, perform their functions, basically with the aid of direct current. The existing elements in the same, constitute of ring commutator, stator, brushes and rotor. The rotor has one or more bearings, which when energized produce a magnetic field. The magnetic poles inserted into the rotor field are attracted to the opposing poles produced by the stator.
AC devices, also known as AC, are intended for use in industries and can be classified as synchronous and asynchronous, three-phase and single-phase. The engine of the asynchronous category suffers with a sliding, according to the intensity of load, however, most of the industries work with this type of device. In the case of synchronous motors, they are generally more used in thermoelectric and hydroelectric plants. This synchronous term is due to the fact that the machine acts with speed of rotation in constant synchrony with the frequency of the electric tension that oscillates.