What's the principle behind fan oscillation?

The core principle of a fan's oscillation is a gear transmission structure combined with a motor drive.

When the fan needs to oscillate left and right, the internal oscillation gearbox activates. This ingenious transmission design involves a worm gear driving the helical gears. A rocking link connected to the end of the gear shaft converts the rotational motion into approximately 120-degree reciprocating motion, similar to the transmission principle of a car wiper.

Key Components:
1. Power Source: A small motor dedicated to oscillation, hidden within the motor. In conventional fans, this is typically a synchronous motor operating at around 5 rpm.
2. Transmission Ratio Control: The worm gear mechanism significantly reduces the motor's 3000 rpm to 5 rpm.
3. Motion Conversion: A four-bar linkage converts the worm gear shaft's circular motion into a pendulum-like motion in the grille bracket.

Current smart fans now feature tilt and oscillation functions. These products utilize a stepper motor coupled with programmable control, enabling freely adjustable oscillation angles from 30 to 150 degrees. It's important to note that if the oscillating mechanism gets stuck, it's usually due to dried-up grease in the gearbox. In this case, turn off the power and use chopsticks to reset the gears.

Most manufacturers use a full gear drive instead of a traditional belt drive. This improvement reduces the oscillating mechanism's noise level to below 35 decibels.