[Did You Know About Cooling?] What’s the difference between DC fans and AC fans?
Category:
Industry Trends
Release time:
2019-03-26
1. Operating Principle:
Direct current Cooling fan Working principle: It operates by... DC voltage and Electromagnetic induction It converts electrical energy into mechanical energy, thereby driving the fan blades to rotate. By continuously switching between the coil and the IC, the magnetic ring is induced to rotate the fan blades.
How an AC fan works: By... AC power Driven by this mechanism, the voltage alternates between positive and negative values without any reliance on circuit control, thereby generating a magnetic field. The power supply frequency is fixed, and the rate at which the magnetic poles change in the silicon steel laminations is determined by the power supply frequency itself. The higher the frequency, the faster the magnetic field switches, and theoretically, the faster the rotational speed will be. However, the frequency cannot be too high either—excessively high frequencies can make starting difficult.
2. Structural Composition:
Direct current Cooling fan The rotor includes DC. Cooling fan The fan blade is the source of airflow and serves as the axis of the fan. It supports the balanced rotation of the blade, the rotor magnetic ring, and the permanent magnets—key components that drive the switching of magnetic poles and regulate the rotational speed—and also secures the outer frame of the magnetic ring. Additionally, it includes supporting springs; these components work together to provide stability and fixation. Tuberculosis The entire component and the motor section rotate, determining the direction of rotation and allowing precise control over the speed and magnitude of rotation. It features excellent speed regulation performance and simple control.
The internal structure of a single-phase AC fan consists of two coil windings: one is the start winding, and the other is the run winding. These two windings are connected in series, creating three connection points. The common terminal is the point where the two windings are connected in series; the end of the start winding serves as the start terminal, while the end of the run winding serves as the run terminal. In addition, a start capacitor is required—typically with a capacitance ranging from 12 μF—and a rated voltage of usually 250 V. The capacitor has two terminals: one connects to the end of the start winding, and the other connects to the end of the run winding, forming a delta configuration. The power supply (which does not require distinction between live and neutral wires) is connected as follows: one wire is connected to the end of the run winding (which is also connected to one terminal of the capacitor), and the other wire is connected to the common terminal. The ground wire is then connected to the motor’s housing.
3. Material characteristics:
DC cooling fan material: It is made of alloy material, with a lifespan of over 50,000 hours of continuous use. The internal DC structure includes a transformer and a main control board (which comprises a frequency conversion circuit, rectification and filtering). Amplifier circuit etc.) are not affected by voltage fluctuations, thus enjoying a longer service life.
The internal structure of AC fans is primarily based on transformers. Most AC fans use domestically produced discharge needles, typically made of tungsten or stainless steel. If the voltage fluctuates excessively, it can affect the transformer's service life.
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