The working principle of brushless DC motor 1 is that due to the commutation of the brushes, the magnetic field generated by the * magnetic steel and the magnetic field generated by the armature winding after being energized remain perpendicular during the operation of the motor, resulting in a large torque and causing the motor to operate. The operating principle of a brushless DC motor is basically the same as that of a brushless DC motor, that is, under a magnetic field with a constant flux density distribution, the total amount of current flowing into the armature winding is constant to generate a constant torque, and the torque is only related to the magnitude of the armature current. The operation of a brushless DC motor also relies on the rotor position sensor to detect the position signal of the rotor. Through the commutation drive circuit, the power switch tubes connected to the armature winding are driven to turn on and off, thereby controlling the energization of the sub winding and generating a rotating magnetic field on the stator, dragging the rotor to rotate. As 636f7079e79fa5e9819331333433623738 rotates around the rotor, the position sensor continuously sends signals to change the energized state of the armature, so that the direction of current in the conductor under the same magnetic field remains unchanged. Therefore, a constant torque can be generated to operate the brushless DC motor. From the composition of a brushless DC motor, it is actually a closed-loop system composed of the motor body, electronic switch circuit, and rotor magnetic steel position sensor.