The electric motor of direct current works according to the principle of magnetic force, when two magnetic fields interact, a force of a magnetic nature manifests itself.
By supplying electric current to the coil representing the rotor, its magnetic field interacts with the magnetic field of the permanent magnet – which represents the stator -, establishing a torque of forces that sets the loop in motion.
Thanks to the commutator, the current reverses in the winding direction so that it continues to rotate and the speed of the rotation is determined by the number of revolutions of the axis with respect to the time (rpm). Boston Gear ORC2SPTLP19
The torque produced is proportional to the intensity of the magnetic field and the value of the electric current in the rotor, also known as armature.
In the stator, the following components are located:
– Carcass – It serves as support of the other components and also closes the magnetic circuit, as it provides the return of the magnetic flux;
Field Winding – Generates the magnetomotive force (f.m.m.) required to produce the magnetic flux to generate motion;
– Poles – The grooves are welded in the shell, which receive the field windings;
– Brushes – Consist of two pieces of graphite that stay in contact with the switch, providing the electric current to the armature circuit.