Brushless Direct Current Motor (BLDCM) consists of a motor body and a driver. It is a typical mechatronics product. Brushless motor refers to a motor without brushes and commutator (or collector ring), also known as commutatorless motor. This is the most commonly used motor in models besides brushed motors. Brushless DC motors do not use mechanical brush devices, but use square wave self-controlled permanent magnet synchronous motors. Compared with brushed motors, it swaps the rotor and stator, that is, the armature winding is used as the stator in the brushless motor, and the permanent magnet material of neodymium iron boron is used as the rotor. The Hall sensor replaces the carbon brush commutator. The performance is much better than that of general traditional DC motors. It has the advantages of high efficiency, low energy consumption, low noise, ultra-long life, high reliability, servo control, stepless frequency conversion speed regulation, etc., while the disadvantages are that it is more expensive and difficult to maintain than brushed motors. It is widely used in aircraft models, high-speed car models and ship models.

However, a single brushless motor is not a complete power system. A brushless motor must basically be controlled by a brushless controller to achieve continuous operation. Ordinary carbon brush motors rotate windings, while brushless motors rotate magnets regardless of whether they are outer rotor structures or inner rotor structures.

The stator of a brushless motor is the part that generates a rotating magnetic field and can support the rotor to rotate. It is mainly composed of silicon steel sheets, enameled wires, bearings, and supports; while the rotor is a part that is attached with NdFeB magnets and rotates under the action of the stator's rotating magnetic field. It is mainly composed of a shaft, magnets, and supports. In addition, the number of magnetic poles formed by the stator and rotor also affects the speed and torque of the motor.