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The Difference Between DC Brush Motor and Brushless Motor

All motors are composed of a stator and a rotor. In order to make the rotor rotate, the direction of the current needs to be constantly changed, otherwise the rotor can only make a half turn. DC motor needs a commutator. Generally speaking, DC motors include brush motors and brushless motors. Brushed motors are called DC motors or carbon brush motors, DC motor refers to DC brushed motor, which uses mechanical commutation. The outer magnetic pole does not move, the inner coil moves, the commutator and the rotor coil rotate together, and the brushes and magnets do not move, so the commutator rubs and rubs to complete the switching of the current direction.



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. A single brushless motor is not a complete power system, and the brushless motor must pass the controller to achieve continuous operation. It is the brushless electronic governor that really determines its performance.


There are two types of brushless motor drives, one is square wave and the other is sine wave. Sometimes the former is called a DC brushless motor, the latter is called an AC servo motor. Brushless motors have different operating modes and can be divided into inner rotor brushless motors and outer rotor brushless motors. The inner rotor is all three-phase and the price is more expensive. The outer rotor is usually single-phase, and the price is lower. The mass production is close to the carbon brush motor, so it has been widely used in recent years.


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