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Time：2022-03-29Views：0
The rotation process of the cooling fan is a process in which the rotating electromagnetic field generated by the energization of the stator coil and the permanent magnetic ring pressed into the fan blade repel each other. The cooling fan is mainly composed of four parts: rotor, stator, motor and outer frame.
1. The brushless DC motor consists of a permanent magnet rotor, a multi-stage winding stator, a position sensor, and an electronic commutation drive control circuit. According to the change of the rotor position, the position sensor commutates the current of the stator winding along a certain order (that is, detects the position of the rotor magnetic pole relative to the stator winding, and generates a position sensing signal at the determined position, which is processed by the signal conversion circuit. Control the power switch circuit, and switch the winding current according to a certain logical relationship). The operating voltage of the stator winding is provided by an electronic switching circuit controlled by the output of the position sensor.
2. Rotor composition: It is composed of motor shell + permanent magnetic strip + shaft core + fan blade. The fan blade is used to create air flow, the axis is to support the rotation of the balanced fan blade, and the object with the residual magnetism of the permanent magnetic ring is magnetized by a strong magnetic field. , characteristics, same-sex repel, opposite-sex attract, the outer frame of the magnetic ring is used to fix the magnetic ring.
3. Stator part: composed of enameled wire + plastic coated silicon steel sheet + bearing + Hall induction detection + drive circuit board + shaft. Among them, the role of the bearing is to high speed, reduce friction, and ensure that the fan can run for a long time. The support spring is used to separate the bearing balance axis; the retaining ring is used to fix the rotating whole part.
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