How to choose a DC fan? Which is better, DC or AC fan motor

Principle 1: Choose a target that can achieve the maximum air volume, and the maximum air volume value is what we expect.

Principle 2: Choose the smallest size of the cooling fan according to the environmental requirements of the site we use.

Principle 3: Choose the goal of achieving the minimum noise, the height of noise is always a criterion for the quality of a fan, so you should choose carefully in this aspect.

Principle 4: Choose the goal that can achieve the least power consumption, energy saving is a big goal for us to choose a cooling fan.

Principle 5: Choose the goal of the longest service life, and being able to work for a long time is a necessary choice for us.

Principle 6: Choosing the lowest cost target is a very real problem.

In the process of using the DC cooling fan, we can know that it uses DC electricity to provide power for it, the DC motor is composed of two parts: the stator and the rotor, the stator has a magnetic pole component (winding type or permanent magnet type), and the rotor has a winding, after the power is applied, a magnetic field (magnetic pole) is also formed on the rotor, so we can know that there is an angle between the stator and the rotor's magnetic poles, and the work is run by attracting each other between the stator and rotor magnetic field N pole and the S pole. In addition, the DC cooling fan has many characteristics such as fast speed, good heat dissipation effect, and long service life.

The first is to look at the brand, and then look at the quality of the product, after strict testing, repeated testing of the product can be regarded as sophisticated, and finally look at the first, cost-effective products are the best choice for users, such as the DC fan of Sanju motor.

DC and AC fan motors have their own advantages and can be selected according to your needs.

DC motors are generally low-power, such as cooling fans in computers or power amplifiers, which are all DC. High-power ones are generally AC, such as electric fans used at home, which are AC.

Difference between DC and AC motors:

A direct current machine is a rotating machine that converts direct current energy into mechanical energy (DC motor) or mechanical energy into direct current energy (DC generator).

It is a motor that can convert direct current energy and mechanical energy to each other. When it is used as a motor, it is a DC motor, which converts electrical energy into mechanical energy; When the generator is running, it is a direct current generator, which converts mechanical energy into electrical energy.

An "alternating current motor" is a machine used to convert mechanical energy and alternating current energy into each other. Due to the tremendous development of AC power systems, AC motors have become the most commonly used motors. Compared with DC motors, AC motors have simple structure, easy to manufacture, and relatively firm, and are easy to make motors with high speed, high voltage, high current and large capacity because there is no commutator (see commutator for DC motors).

The power of AC motors covers a wide range, from a few watts to hundreds of thousands of kilowatts, or even millions of kilowatts. In the early 80s of the 20th century, the largest steam turbine generator had reached 1.5 million kilowatts.

The above content reference: Encyclopedia - DC motor.

The above content reference: Encyclopedia - AC motor.

Difference 1: different materials, different costs, DC brushless fans generally use plastic frames, small copper wires for motors are used, low material costs, AC fans belong to brushed motors, the stator part is large, copper wires are more, the outer frame is mostly made of aluminum, the cost is much higher, difference 2: the length of use, the life of DC fans is longer.

Difference 3: The power supply voltage is different, the output current mode is different, the DC fan generally has a small voltage, the common is 5V, AC is 20V, 240V, 110V.

Difference 4: The size of the air volume, the DC fan blades are large, the air volume is larger, and the AC fan has a small air volume because of its small leaves.

Difference 5: Safety issues, DC fan power supply voltage is low, no danger.

FYI. Liang Zhaoling.

When we choose a cooling fan, there are two main fans, one is a DC fan, the other is an AC fan, the difference in the characteristics of the two will be for specific use, which one is better? Follow Yi Rongchuan to take a look at the difference between these two fans.

1.Electricity mode: AC fan can be directly connected to the mains 110V, 220V, etc. The DC fan can only work after rectifying and transforming from the mains, such as DC 5V, 12V, 24V, etc.

2.Service life: There is not much difference in the life of AC fans and DC fans with similar bearings, which is mainly related to the choice of bearings.

3.Airflow: DC fans of the same specification (such as 1238) can also have a higher speed due to the longer fan blades, while the airflow of DC fans will be larger.

4.Cost: In the case of convenient access to electricity, DC fans of the same specification are cheaper than AC fans in terms of two single fans.

5.Safety: Because the AC fan uses mains power, it is a dangerous voltage, and if you accidentally touch it, it is life-threatening, and the DC fan is also safe at 48V.

Summary. Hello, dear, AC is good.

Direct current (DC) refers to the current that does not change its direction and time periodically.

alternating current, abbreviated as AC. It is a type of electric current that periodically changes in size and direction over time. Alternating current is sent out by alternators, in the process of power generation, multiple pairs of magnetic poles are evenly distributed in a circle at a certain angle, so that in the process of power generation, each coil cuts the magnetic field lines, because there are multiple pairs of magnetic poles, the voltage and current generated by the magnetic field lines generated by each pair of magnetic poles are cut and the voltage and current are changed according to the chord law, so it can continuously produce stable current.

The frequency of domestic alternating current is generally 50 hertz, that is, it changes 50 times per second. Some* alternating current has a frequency of 60 Hz, i.e. 60 times per second. Of course, there are other frequencies as well.

For example, there are square waves, triangles, etc. in the line, but the alternating current of these waveforms is not generated by the conductor cutting the magnetic field lines, but when the capacitor is charged and discharged, and the transistor is switched.

The direction of direct current does not change with time. It is usually divided into pulsating direct current and steady current. For example, the voltage of about 300 volts in the power supply circuit in the color TV is the pulsating DC component, which can be removed by capacitors.

Steady current is ideal, and the magnitude and direction are constant.

Is it better to use a household fan for DC or AC.

Hello, dear, I am the Q&A Lord, I received your question, and I am sorting out the answer, please wait, I will reply to you within ten minutes.

Hello, dear, AC is good. Direct current (DC) refers to the current that does not change its direction and time periodically. alternating current, abbreviated as AC.

It is a type of electric current that periodically changes in size and direction over time. Alternating current is sent out by alternators, in the process of power generation, multiple pairs of magnetic poles are evenly distributed in a circle at a certain angle, so that in the process of power generation, each coil cuts the magnetic field lines, because there are multiple pairs of magnetic poles, the voltage and current generated by the magnetic field lines generated by each pair of magnetic poles are cut and the voltage and current are changed according to the chord law, so it can continuously produce stable current. The frequency of domestic alternating current is generally 50 hertz, that is, it changes 50 times per second.

Some* alternating current has a frequency of 60 Hz, i.e. 60 times per second. Of course, there are other frequencies as well. For example, there are square waves, triangles, etc. in the line, but the alternating current of these waveforms is not generated by the conductor cutting the magnetic field lines, but when the capacitor is charged and discharged, and the transistor is switched.

The direction of direct current does not change with time. It is usually divided into pulsating direct current and steady current. For example, the voltage of about 300 volts in the power supply circuit in the color TV is the pulsating DC component, which can be removed by capacitors.

Steady current is ideal, and the magnitude and direction are constant.

The difference between DC inverter fan and ordinary fan, 1. Speed: The speed of ordinary fan blades is completed by changing the number of turns of the copper wire inside the motor, such as the number of turns of high-end is 1000 turns, the mid-range is 2113800 turns, and the low-end is 500 turns, and the speed range is about 600-1000 minutes; The inverter fan is to change the current working frequency through the inverter speed control system to control the speed of the drive motor, Zheng Chong to achieve the effect of increasing the speed range, the speed range can be expanded from 4102 to 100-1000. 2. Change the wind mode:

Ordinary fans can change the winding of the coil on the fan to achieve the purpose of changing the wind power; The inverter fan has DC and AC inverter, which is to electronically adjust the voltage or current to change the wind speed, and the functional normal wind, natural wind, sleep wind, and intelligent wind are all realized by adjusting the voltage or current through the control chip. Hope it helps!

The differences between DC fans and AC fans are: high and low exhaust air volume, different materials, and different application time.

First, the working voltage of the power supply system is different and potential safety hazards. First, the exhaust air volume is high1. The DC fan blades are large and the exhaust air volume is larger.

2. The AC fan has small blades and small air volume.

Second, the materials used are different1. The cost is uneven, the brushless DC fan usually uses a plastic frame, the application of small copper wire for the motor is less, and the raw material is low.

2. The AC fan is a brushed motor, the stator part of the motor is large, there are many copper wires, and the frame is made of aluminum, and the cost has risen a lot.

Third, the length of application time variesDC fans have a longer lifespan comparatively.

Fourth, the working voltage of the power supply system is different1. The output current flow method is different, and the DC fan usually has a small working voltage, and the commonly used one is 5V.

2. AC is 20V, 240V, 110V.

5. Potential safety hazardsThe DC fan power supply system has a low working voltage and no risk.

Many people confuse DC fans with AC fans, but they are not the same. What is the difference between a DC fan and an AC fan? Today, PCHOUSE will answer them for you one by one.

1. The working principle is different.

The DC fan is converted from electrical energy into machinery through DC voltage and electromagnetic induction, and the fan blade rotates by relying on the coil and IC to continuously switch, and the induction magnetic ring drives the fan blade to rotate.

The AC fan is driven by an AC power source, and the voltage will alternate positively and negatively, completely independent of circuit control, and generate a magnetic field.

2. The structural composition is different.

The rotor of the DC fan includes the DC cooling fan blade, which is the source of air flow and the fan shaft, which is used to support the rotation of the balancing fan blades, the rotor magnetic ring, the permanent magnet, the key to promote the magnetic level switching speed, the outer frame of the magnetic ring, and the fixed magnetic ring.

The internal structure of the AC fan (single-phase) is composed of two coil windings, one is the starting winding, and these two windings are connected in series with each other, so that three points are formed, the series connection point is the common end, the end of the starting winding is the starting end, and the end of the running winding is the running end.

3. The material characteristics are different.

The DC fan is made of alloy materials, and its life can be used continuously for more than 50,000 hours, and the DC internal structure has a transformer and a main control board (including frequency conversion circuit, rectifier filter, amplification circuit, etc.) that will not be affected by voltage fluctuations, so its service life is long.

The internal structure of the AC fan is mainly based on the transformer, and most of the AC fans are selected from the domestic discharge needle, which is generally tungsten needle or stainless steel, if the voltage fluctuates too much, it will affect the service life of the transformer.