DC fan and its working principle

2019-09-06

The DC fan, as its name suggests, is a cooling fan that converts electrical energy into electromagnetic energy through DC voltage and electromagnetic induction, converts electromagnetic energy into mechanical energy, and finally converts it into kinetic energy, thereby turning the blade.


The conventional DC fan is mainly composed of four parts: a rotor, a stator, a motor, and an outer frame. DC motor consists of a permanent magnet rotor, a multi-stage winding stator, a position sensor, and an electronic commutation drive control circuit. Rotor composition: by motor casing + permanent magnetic strip + shaft core + fan blade. Stator part: Enameled wire + plastic coated steel sheet + bearing + Hall induction detection + drive circuit board + shaft. as the picture shows:

DC fan

The core component of the DC fan is the stator and rotor. Through Ampere's right-hand rule, we know that the conductor passes through the current, and a magnetic field is generated around it. If the conductor is placed in another fixed magnetic field, suction or repulsion will occur, causing the object to move. Inside the fan blade of the DC fan, a rubber magnet previously filled with magnetism is attached. Surrounding the silicon steel sheet, the shaft core is wound with two sets of coils, and the Hall sensing component is used as a synchronous detecting device to control a group of circuits, which makes the two sets of coils wound around the shaft work in turn, so that the silicon steel sheets generate different magnetic poles. This magnetic pole and the rubber magnet generate a repulsive force. When the repellent force is greater than the static friction of the fan, the blade naturally rotates. Since the Hall sensing component provides a synchronizing signal, the blade can continue to operate, and its direction of operation can be determined by Fleming's right-hand rule. This is how the DC fan works.


Linyi Tongxin Electric Co., Ltd. is an old-fashioned cooling fan manufacturer with more than 20 years of experience in R&D, production and sales. It can customize various DC fans, AC fans, EC fans and provide the most cost-effective cooling solution for customers.

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