First, the brush DC motor introduction
Before introducing the brushless DC motor, let's take a look at the brush motor:
The DC motor is famous for its good starting performance and speed regulation performance. Among them, the brushed DC motor belonging to the DC motor adopts a mechanical commutator, which makes the driving method simple.
The motor is mainly composed of a stator made of a permanent magnet material, a rotor (an armature) wound with a coil winding, a commutator, and a brush. As long as a certain DC current is applied to both ends of the brush A and B, the commutator of the motor will automatically change the direction of the magnetic field of the motor rotor, so that the rotor of the DC motor will continue to run.
There are the following disadvantages of DC motors
The structure is relatively complicated, which increases the manufacturing cost;
Easy to be affected by the environment (such as dust), reducing the reliability of work;
Sparks are generated when commutating, limiting the range of use;
Easy to damage, increased maintenance costs, etc.
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