Electric motor

An electric motor consists of the following essential components:
In this design, the stator is a permanent magnet, while the rotor is a coil.
The current flows through the brush and the commutator through the coil.
When the current is increased, the rotor starts moving.
This is achieved with the following principle:
The coil is surrounded by a magnetic field.
This field is directed in the way, that that the poles repel.
The coil rotates almost 180 due to magnetic forces.
For a short time the contact with the commutator is interrupted. There is no current flowing through the coil and no magnetic field.
However, due to inertia, the coil continues to move.
Now the current is flowing through the coil again. The north and south poles are reversed, so the rotor and stator repel each other.
Every half turn the magnetic field changes.
This motor is not running smoothly. Multiple coils can improve the principle.