A ball fan is an electric motor in which a certain number of balls are used to carry the torque between the rotor and the stator. These balls can rotate on the ball bearing, rotating independently like stars in the sky, achieving relative motion between the stator and the rotor. The advantages of ball fans are stable operation, long life, high efficiency, low noise, no oil leakage, and stable performance.

The working principle of the ball fan is to pass the torque between the rotor and the stator to the ball through the ball bearing, and then pass the torque to the stator through the rolling of the ball, thus achieving the rotation of the rotor. The speed of the ball fan can be adjusted by changing the ratio of the area of the guide vane to the area of the gap between the adjacent guide vane and the minimum distance between the blade and the guide vane.

The application of ball fans is very wide, such as in computer hosts, automobile engines, household appliances and other fields have applications. In the change of the form of the computer host, more and more fans in the case, some fans can be oiled, but some fans such as ball fans are difficult to oil. For the ball fan, you can use a fine drill or knife to dig out the small hole, use a needle to suck oil or lubricating oil into the bearing, and then use a transparent tape to seal the small hole, so that the bearing in the ball fan can have oil and no longer make noise.