The BLDC motor is a type of synchronous motor, that is to say, the speed of the motor rotor is affected by the speed of the rotating magnetic field of the motor stator and the number of rotor poles (p):

　　The BLDC motor can still control the rotor of the motor to maintain a certain speed when the load changes within the rated load range.

　　The brushless DC driver includes a power supply part and a control part: the power supply part provides three-phase power to the motor, and the control part converts the input power frequency according to the demand.

　　BLDC motors are generally expected to be used for speed control where the speed can be stabilized at the set value without changing too much when the load changes, so the motor is equipped with a hall-sensor capable of inducting a magnetic field, as the speed The closed-loop control is also used as the basis for phase sequence control. But this is only used for speed control and not for positioning control.

　　BLDC motors have fast response, large starting torque, and can provide rated torque from zero speed to rated speed, but the advantages of DC motors are also their disadvantages, because BLDC motors have to generate rated torque For the performance of constant torque under load, the armature magnetic field and rotor magnetic field must be maintained at 90°, which requires carbon brushes and commutators.