1. electronic: circuit work in the noise; miniature fan electronic noise is relatively simple line so easy to judge, easy to solve. According to the fan structure needs (leaf size / weight / load and voltage / wire diameter / speed) correct configuration of the corresponding circuit line; simple and direct, efficient and stable. Electronic noise must be taken into account in the initial setup for the best, in general, with good materials IC can be resolved without going into detail.
2. Structure: micro-fan in the operation of the sound generated by the noise, friction sound / vibration sound / sound whistling.
Friction sound: interference (friction) in the rotation of the noise. 1. Micro fan bearings and micro fan core rotation friction produced by sound. The size of the sound depends on the size of the surface area of the friction and the size of the load mass of its own rotating body as well as the speed of rotation. 2. fan impeller rotation caused by friction between the blades and the air generated sound. The size of the sound depends on the number of blades, the speed of rotation and load mass and the length of the blades with the blade inclination structure.
Vibration sound: by the rotation of unequal mass to produce the sound of oscillation. The size of the vibration sound is determined by the frequency of vibration speed and the size of the unevenness.
The sound of whistling: the whistling sound produced by the rotating diffuser blade through the frame constraints when it reaches a certain wind flow speed. Sound whistling mainly depends on the rotational speed and blade inclination angle and the number of blades.