What are the control techniques used in shaded pole AC fans?

2023-11-27 22:27:56

With the continuous advancement of science and technology, modern home appliances are becoming more and more diversified, and AC fans with shaded pole structure are one of them. The shaded pole structure AC fan is a fan that can present three-dimensional space movement. It has a unique design and structure, which can make the fan more beautiful and stable while ensuring air circulation.

As people's quality of life is getting higher and higher, the demand for AC fans with shaded pole structure is also increasing. However, the control technology of AC fans with shaded pole structure is not simple, and requires a combination of physics and circuit theory. This article will describe the control techniques used in shaded pole AC fans.

In order for the shaded pole structure AC fan to create a unique motion effect, a special design of the fan blades is required. Generally speaking, the rotor in a conventional AC motor rotates against a magnetic field, but this design is not essential for a shaded pole fan. In the design of the shaded pole fan, the structure of the rotor and the motor casing should be symmetrical, so that during the movement of the motor, the overall internal force distribution is even, thereby increasing safety performance and ensuring stability during use.

Because of this particular design, motors suitable for this type of fan are rare. In a general motor, due to the influence of the magnetic field, the rotor center is prone to centering deviation, and in a shaded pole fan, it will affect the operating efficiency of the entire fan. Therefore, a special control technique is required to be able to operate the fan.

This control technology is based on physics and circuit theory, and can only be obtained through complex calculations and experiments. Specifically, this technology can be divided into two parts: one is to control the speed of the motor, and the other is to control the direction of rotation of the motor.

For a part, a three-phase AC winding can be used as a driving power source for an AC fan motor with a shaded pole structure. The three-phase AC winding can rotate under the action of the magnetic field, and the speed is controlled by the center line. When using this kind of winding, it is necessary to ensure that the three-phase current flows evenly, which requires calculation to ensure that the current between the phases is evenly distributed. In this way, the rotation speed of the AC fan with the shaded pole structure can be controlled, thereby controlling the output air volume of the fan.

For two parts, the rotor of a shaded pole fan is a design consisting of two stacked concentric circles, where the outer circle is the baseline and the inner circle is movable. During the operation of the motor, in order to make the fan move in three-dimensional space, it is necessary to control the rotation direction and speed of the inner circle.

Controlling the direction of rotation of the inner circle is achieved by flipping the magnetic poles. When the positive pole is facing the top of the fan, the effect of clockwise rotation is good; when the negative pole is facing the top of the fan, the effect of counterclockwise rotation is good.