Brushless DC motor is a new type of integrated motor with the development of semiconductor electronic technology. It is the combination of modern electronic technology (including power electronics, microelectronics), control theory and motor technology. Brushless motor uses electronic technology to input control signals to switch current and obtain torque through different coil groups to make the rotor rotate, so it is also called EC (electronic commutation) motor. In the stator winding mode of DC brushless motor, the whole-span concentrated winding is adopted, and the two phases are connected. The conduction of each phase is 120 °, and the phase is changed every 60 °. The position sensor detects the position of the commutation point; The magnetic sheet on the permanent magnet rotor is in the shape of a tile, and the magnetic density generated in the air gap is in the shape of a trapezoidal wave distribution, forming a back EMF with a trapezoidal wave.

Structure: stator, rotor, position sensor


Brushless, low interference, low noise, smooth operation;

Good controllability and wide speed range;

Large torque ripple, large starting torque and good low speed performance;

High reliability, long service life and no need for regular maintenance;

High power factor, high working efficiency and high-power density;

The control circuit is relatively simple, the structure is simple, and the volume is small.

Applications: computer peripheral equipment, office automation equipment, digital electronic consumer goods, industrial drive, automobile industry, medical equipment, household appliances and smart home and other fields.

According to whether the stator has slots, it can be divided into slotted and slotless motors

According to the position of rotor, it is divided into inner rotor motor and outer rotor motor


According to the shape of connecting flange, it is divided into round and square