By the graphite brushes, which have the objective to slide in the armature collector, there is an expressive circulation of electric current through the armature winding, which guarantees the creation of another magnetic field.
The instant the field coil is fed properly by an electric current, it becomes capable of creating a kind of magnetic field around the winding, thanks to the current circulating inside it. In the case of natural magnets, this field will always remain surrounding the induced.
It is important to note that the magnetic fields of the field coil, as well as of the armature, are capable of combining with each other, in a few moments repelling and attracting, causing the armored bearing armature to begin to rotate.
The main functions of the electric motors are realized so that they can be applied in different devices inside a car.
At one end of the armature, it may have a gear, responsible for pulling and releasing a lock, such as having a pulley or coupling type, for the purpose of connecting the combustion engine or, if a propeller for the operation of an internal fan.
https://www.mrosupply.com/bearings/mounted-bearings/pillow-blocks/2272225_vps-227_browning/