All motors are composed of a stator and a rotor. In order to make the rotor turn, the direction of the current needs to be constantly changed, otherwise the rotor can only turn half a turn, which is like a bicycle pedal. So the DC motor needs a commutator. A broad sense of DC motors includes brush motors and brushless motors. Brushed motor is also called DC motor or carbon brush motor. The DC motor is often referred to as DC brushed motor. It adopts mechanical commutation, the external magnetic pole does not move, the internal coil (armature) moves, and the commutator and rotor coil rotate together , The brushes and magnets are not moving, so the commutator friction and friction, complete the current direction switching.

Brushless motor is also called DC variable frequency motor (BLDC) in some fields. It uses motor commutator, and the coil (armature) does not move the magnetic pole. At this time, the permanent magnet can be outside the coil or inside the coil. The outer rotor brushless motor and the inner rotor brushless motor are divided. However, each brushless motor is not a complete power system. The brushless basically must be controlled by the brushless controller, that is, the ESC to achieve continuous operation. It is the brushless electronic governor that really determines its performance.

There are two types of drive motors for general brushless motors, one is square wave and the other is sine wave. Sometimes the former is called a DC brushless motor, and the latter is called an AC servo motor. To be precise, it is a kind of AC servo motor. Brushless motors have different operating modes, which can be divided into inner rotor brushless motors and outer rotor brushless motors. The inner rotors are all three-phase, and the price is more expensive. The outer rotors are usually single-phase, and the price is close to the people. Mass production has been close to carbon brush motors. Therefore, they have been widely used in recent years. Rotor price.