It can be said that nowadays, it is an almost impossible task to imagine the day to day without the use of any type of electrical device, not only considering appliances that are part of the routine of the whole population, but also by the importance of elevators, garage electronic gates and escalators. In former times, in industries, in order to be viable the production of all these types of machines, other diverse equipments were manufactured. Even though very different in appearance and larger from a small blender, for example, most of them use the same basic operating system, which is nothing more than that of an electric motor MD50E-420.
It is worth remembering that in about 1820 the Danish scientist Hans Christian Oersted could not have thought that through a simple experiment he would be able to discover a physical principle of extreme relevance for the operation of electric motors. In this way, Oersted passed an electric current, generated by a normal heap, by a conductive wire, bringing a compass closer to it. The needle, which acts as a kind of magnetic bar, moved and aligned perpendicular to the wire. For the scientist, the event confirmed the important fact that around the wire there was a magnetic field, able to act on the field of the needle.