Induction electric motors have a relatively static magnetic circuit, which is properly formed by ferromagnetic plates that are stacked and correctly insulated from each other (called a stator) and by coils, which are inserted into open cavity species in the stator, being fed by the alternating current network.
It is worth mentioning that the rotor must be anchored in a kind of shaft, whose main function is to transmit to the load, all the mechanical energy caused. The asynchronous electric motor is composed of important elements. The air gap, which relates to the distance between the rotor and the stator, is considerably reduced, in a manner capable of reducing the no-load current and hence the losses, but also so that the increase in the power factor at vacuum can be achieved.
In order to elucidate, we can consider the projection of the different elements of the asynchronous rotor motor in a squirrel cage. There is also a rotor which is composed of a ferromagnetic core, also laminated, on which a winding or a set of parallel conductors can be found, where currents commonly caused by the alternating current of the stator coils are induced.