The difference between AC fan and DC fan

1. Working principle:

The working principle of the DC cooling fan: through DC voltage and electromagnetic induction, electrical energy is converted into machinery to drive the rotation of the blade. The coil and IC are continuously switched, and the induction magnetic ring drives the rotation of the blade.

The working principle of an AC fan: It is driven by an AC power source, and the voltage will alternate between positive and negative. It does not rely on circuit control to generate a magnetic field. The frequency of the power supply is fixed, and the changing speed of the magnetic poles generated by the silicon steel sheet is determined by the frequency of the power supply. The higher the frequency, the faster the magnetic field switching speed, and the faster the rotation speed in theory. However, the frequency should not be too fast, too fast will cause difficulty in starting.

2. Structure composition:

The rotor of the DC cooling fan includes the fan blades of the DC cooling fan, which are the source of air flow, the fan axis, and are used to support the rotation of the balanced fan blades, the rotor magnetic ring, permanent magnets, and promote the magnetic level switching speed key, the magnetic ring frame, Fixed magnetic ring. In addition, it also includes supporting springs. Through these parts, the whole part and the motor part are fixed for the rotation of the tuberculosis. The direction of rotation is produced, and the active and large rotation speed is critical. Its speed regulating performance is good, and the control is simple.

The internal structure of an AC fan (single-phase) is composed of two coil windings, one is the start winding, these two windings are connected in series with each other, thus forming three points, the series point is the common end, and the start winding end is the start end operation The end of the winding is the running end. In addition, a starting capacitor is needed. The capacity is usually between 12uf and the withstand voltage is usually 250v. There are two connectors. One end is connected to the end of the starting winding and the other is connected to the end of the running winding to form a triangle. The power supply (no need to distinguish the live line and the neutral line) is connected to the end of the running winding (that is, it is also connected to one end of the capacitor), and the other is connected to the common end, and the grounding wire is connected to the motor shell.

3. Material characteristics:

Material of DC cooling fan: It is made of alloy material, and the life span can be used continuously for more than 50,000 hours. The internal structure of DC has transformer and main control board (including frequency conversion circuit, rectifier filter, amplifier circuit, etc.), which will not be affected by voltage fluctuations. Long service life.

The internal structure of the AC fan is mainly a transformer. Most of the materials used for the AC fan are made of domestic discharge needles, generally tungsten needles or stainless steel materials. If the voltage fluctuates too much, it will affect the service life of the transformer.


Post time: Sep-24-2020