Electric motor

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  • 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.





Rotating coil



Rotating magnet