Brushless electric motors

The brushless motor is a self-piloting electric motor that operates using a rotor made up of one or more permanent magnets.

The brushless motor uses direct current but contains no rotating commutator. This makes it highly efficient and more resistant to wear.

Stator

The stator, the fixed part of the brushless motor, is made up of coils of wire wound around iron poles. These coils are arranged in a polyphase configuration, usually three-phase.

Rotor

The rotor is the moving part of the brushless motor; unlike conventional DC motors, the rotor of a brushless motor is fitted with permanent magnets.

Contrôleur électronique

The electronic controller replaces the role of the brushes and the commutator. It switches the current in the stator coils to create a rotating magnetic field that turns the rotor.

Applying the current

The brushless motor's electronic controller supplies the stator coils with a three-phase current, creating a rotating magnetic field.

Interaction of the magnetic fields

The permanent magnets in the rotor follow this rotating magnetic field, causing the rotor to turn.

Electronic switching

The controller detects the position of the rotor using position sensors, such as Hall-effect sensors, or by a sensorless method. It switches the currents in the stator phases according to this position to keep the rotor turning.

Brushless motors are used in many applications where high efficiency, reliability and low maintenance are crucial. Brushless motors find applications in the manufacture of drones and other aerial vehicles with integrated controls.

Brushless motors offer many advantages over traditional DC motors thanks to their efficiency, longevity and low maintenance requirements, making them the choice for a wide variety of applications.