DC Fan
Company Profile
Established in 2003, Shenzhen Amore Industrial Co., Ltd (AMR) is a company devoted in the production of AC/DC axial fans, motors and SPD. There are 4 divisions under the company, namely: Electronic Cooling Division, Surge Protective Device Division, Motor Division, and Y.S. TECH Agency Division. AMR products all have been certified by CCC, CE, UL, TUV and etc. The factory has passed ISO9001, ISO14001, QS9000 and other certifications.
Why Choose Us
Quality Control
Based on the principle of quality first and customer first, AMR employs advanced technology and continuously improves product quality to meet the needs of customers. Our clients include Huawei, ZTE, Emerson, China Mobile, China Unicom, China Telecom, Southern Power Grid, as well as APC, Delta, Eltek and other famous customers both at home and abroad.
Professional Team
Our target is to provide excellent quality and professional services. In the ever-changing global economic environment, AMR endeavors to work with customers for a better future.
Our Factories
AMR has 3 factories in Shenzhen. The factories have set up excellent management system and boast of most professional teams armed with advanced production and experimental equipment and develop cutting-edge technologies.
Our Certificate
Passed ISO9001、ISO13485 quality management system certification.
The series products have passed UL、CE、 3C international certification.
What is DC Fan？
A DC fan is an electric fan that works on the direct current (DC) power. It is an abbreviation for Direct Current fan. The DC fans have a different working mechanism from the AC (alternating current) fans. Air conditioning fans are those fans that use AC power sources. The contrary DC fans are operated with a DC power supply. The most distinctive property that DC fans have, when compared to AC fans, is their power source. DC fans have many benefits that cannot be found with other brands. They are, for example, energy efficiency, speed control, and low noise.
The fan’s motor relies on the constant voltage to generate the necessary torque to rotate the fan blades and create airflow. DC fans can be found in various sizes and configurations, ranging from small axial fans to larger blowers.
Benefits of DC Fan
Energy Efficiency
Energy saving are one of the key advantages of using DC fans. DC fans save energy as compared to AC fans because they can work with lower voltage and current, thus making them more efficient. The US Department of Energy conducted research which revealed that the DC fan can cut down the energy consumption by up to 70% in contrast with the AC fan. This efficiency manifests itself in the form lower energy use and operation expenses, which make them a sustainable and cost-effective cooling option.
Durability and Reliability in Harsh Environments
DC fans are well recognized for their hardiness and reliability, even in the most adverse conditions of the industrial areas. They are built to tolerate extreme temperatures, dust, and moisture conditions, which guarantees the product’s lifespan. Based on the research done by IEEE (Institute of Electrical and Electronics Engineers), DC fans with proper enclosures and sealing can be used to run steadily in temperatures ranging from -40 °C to +85 °C, which makes them a good choice for a large number of industrial applications.
Variable Speed Control
DC fans provide accurate speed control. This permits the users to set the fan speed according to their cooling requirements. This versatility is particularly beneficial in areas with frequent temperature changes. It is also useful when various cooling levels are required at different times. The fan speed control allows the airflow to be adjusted. Energy consumption can also be reduced when slower speeds are sufficient.
Low Noise Operation
This is due to their easy and effective operation. Most DC fans make less audible noise than AC motors. This makes them appropriate for situations where low noise levels are critical. Some of the examples are of medical equipment, office environments, and residential settings.
This decreases the level of noise produced. Secondly, the fan speed control capability provides for noise elimination when lower speeds are enough. Running at lower speeds, DC fans generate less turbulence and air noise. This leads to less noise.
Type of DC Fan
2-Wire DC Fan
2-wire fans are actually not driven by adjusting the DC voltage into the fan. Instead, they are driven with a modulated voltage, where a PWM signal is used to modulate a switching FET. The average current driven into the fan will determine the average power delivery, and this will determine the rotational speed of the fan. The average current into the fan could be measured with a current-sense resistor, and this value will be related to the fan’s rotational speed.
3-Wire DC Fan
A 3-wire DC fan is driven in the same way as a 2-wire DC fan, but the fan includes a tachometer line that provides the fan’s rotational speed measurement. An external gate drive controller or some logic could then be used to set the PWM frequency based on the fan’s speed measurement.
Tachometer wires do not continuously output a speed signal because the PWM driving signal is essentially turning the fan on and off repeatedly. The tachometer can only output an accurate measurement while the fan is on for multiple PWM cycles.
4-Wire DC Fan
4-wire fans have the most connections but they are the easiest to set up in terms of driving and sensing circuitry. 4-wire fans accept a PWM driving signal that sets the fan speed, and they provide a tachometer output that can be used to measure the fan speed or rotor state (locked vs. unlocked). Most fan controller ICs will use a 4-wire fan with a feedback loop to sense the speed of the fan and adjust the PWM duty cycle used to drive the fan, which maintains the required speed. The tachometer line functions as described above.
4-Wire Fan in 3-Wire Mode
4-wire DC fans can be used in 3-wire mode as long as the design omits speed sensing with the tachometer wire. 4-wire fans have the driving mechanism built into the body of the fan, so the PWM drive line will be required. However, the tachometer line can be eliminated if speed regulation is not needed or desirable.
Applications of DC Fans in the Industry
Electronics Cooling
DC fans are the most common types of fans that are used in the electronics industry. These coolers are installed on CPUs, GPUs, power supplies as well as other devices that produce heat to dissipate their heat. DC fans are small in size and make low sound. They also can provide many speed options. These elements enable them to be used in the maintenance of the temperatures inside the electronic enclosures.
HVAC Systems
Dc fans are incorporated in hvac systems in the heating, ventilation, and air conditioning (HVAC) sector. They are used for the ventilation and the regulation of temperature. The DC fans are mostly used in air conditioners, heaters, and ventilation units. This is because they guarantee that air is well mixed and uniformly circulated.
DC fans provide a variety of speed settings, so specific cooling needs can be perfectly met. This is especially significant in the field of HVAC systems, where you may need to use different heating or cooling levels in various areas.
Medical Equipment
DC fans are the right choice for medical equipment. They are used in ventilators, patient monitors, and diagnostic machines. In terms of reliability, DC motors work quietly and have low noise levels. They also provide the same services in demanding situations. These characteristics make them very valuable for medical uses. The only thing that matters for healthcare professionals in these situations is the consistency of their performance.
Automotive Industry
DC fans have a variety of purposes in the automotive industry. They are employed for the cooling of the engine, brake and the ventilation of the cabin. DC batteries are robust and are able to endure extreme situations. This imparts them with the competence to be used in vehicles.
The ability to control the fan speed is not the last, but one of the most important features in automotive settings. It gives you the option to choose the cooling performance that best suits your needs. This may be varied depending on the driving conditions and the engine load.
Difference Between DC Fan and AC Fan
The power supply of AC cooling fan is AC, and the voltage of power supply will change sinusoidally. However, the voltage of power supply of DC cooling fans is fixed, which must rely on the circuit control, so that the two groups of coils work in turn to produce different magnetic fields. Because the power frequency of AC fan is fixed, the change speed of magnetic pole produced by silicon steel sheet is determined by the power frequency. The higher the frequency is, the faster the switching speed of magnetic field will be. Theoretically, the speed will be faster, just like the principle that the more the number of poles of dc fan is, the faster the speed will be. However, the frequency should not be too fast, or it will cause difficulties in activation. We use dc fans on the computer radiator. Generally, a good cooling fan mainly focuses on the air flow, rotation speed, noise, service life, and the type of blade bearing.
For cooling fans of the same size and specification, the motor volume of AC fan is large and the blades are short, while that of dc fan is just the opposite, and the blades are long and the motor is small such as the micro DC fan, so the air flow per unit area is more, the air flow is larger and the heat dissipation capacity is better.
The oute frame of AC fan is generally aluminum frame, while that of dc fan is plastic frame. Therefore, the capacity of temperature resistance is different. The choice of dc fan or AC fan depends on which product is more suitable for its own product with the same cost.
DC axial fan is made of PBT material. When it is working normally, the service life can be as high as 50,000 hours. The internal structure of the DC has a transformer and a main control board, which will not be affected by voltage fluctuations, so it is used Longer life.
High speed axial fan, its rotor contains DC cooling fan blades, which are the source of air activity, the fan axis, and are used to support the rolling of the balanced fan blades, the rotor magnetic ring, and permanent magnets. Ring frame, fixed magnetic ring.
In addition, DC cooling fan also includes a supporting spring, through which all the components and motors of the tube rolling are fixed, the rolling direction is produced, and the key to the size of the rolling speed can be activated. Its speed regulating performance is good, and the control is simple.
How a DC Fan Works?
DC fan, as the name suggests, is a cooling fan that converts electric energy into electromagnetic energy through DC voltage and electromagnetic induction, then into mechanical energy, and finally into kinetic energy, so as to make the fan blades rotate.
Conventional dc fan is mainly composed of rotor, stator, motor and frame. The dc motor consists of permanent magnet rotor, multistage winding stator, position sensor and electronic commutation drive control circuit. Rotor is composed of: motor shell + permanent magnetic strip + shaft core + fan blade. Stator is composed of: enameled wire + plastic coated silicon steel sheet + bearing + hall induction detection + drive circuit board + shaft.
The core components of dc fan are stator and rotor. According to the Ampere's right-hand rule, we know that when electric current passes through a conductor, there will be a magnetic field around it. If the conductor is placed in another fixed magnetic field, there will be a suction or repulsion force, which will cause the object to move. The inner part of the fan blade of the dc fan is filled with a magnetic rubber magnet. Around the silicon steel sheet, two groups of coils are wound separately on the axis, and the hall induction module is used as a synchronous detection device to control a group of circuits. The circuit makes the two groups of coils around the axis work in turn, so that the silicon steel sheet produces different magnetic poles, which generate an attractive and repulsive force with the rubber magnet. When the repulsion force is greater than the static friction force of the fan, the fan blade rotates naturally.
Generally, correct installation of DC fan is beneficial to the heat dissipation performance of the product, including the installation direction, wind direction, location, distance from the heat dissipation product and other factors. For the same DC fan, due to different installations, the performance of the heat dissipation effect will be very different.
1. When installing the DC fan side suction, please try to keep away from the cooling body, etc.
2. The installation hole of the DC fan should be larger than the diameter of the fan, and the installation diameter of the fan> the diameter of the fan.
3. When installing the fan, there should be no gap between the DC cooling fan and the panel. (If there are gaps, the cooling effect will not be fully exerted).
4. The rapid change of the wind direction and the cross-sectional area of the flow direction will weaken the cooling effect, so please avoid this situation.
5. Use a single-sided flange surface for installation (single-sided flange installation).
6. Use through bolts for installation (flange installation on both sides). When installing with flanges on both sides, please fix the case so that it does not change. The tightening torque should be about 0.44N·m.
7. Box fan installation. Please align the box fan with the screw holes, insert it into the panel cutout, and fix it with the attached mounting screws and nuts. ·The cover can be installed up and down, please install it according to actual needs.
Composition of DC Fans
DC fans are primarily composed of four main components: The rotor, stator, motor, and outer frame. Each component is constructed from materials selected for their specific properties to enhance the fan's overall performance.
Rotor Composition
The rotor in a DC fan includes a motor shell and a permanent magnetic strip. The choice of material for the rotor is critical for its magnetic properties and structural integrity. Permanent magnets made from materials such as neodymium or ferrite provide the required magnetic field for the rotor to interact with the stator's electromagnetic field, thus creating rotation Leipole.net.
Stator and Motor Composition
The stator contains multi-stage winding, which is typically made from copper due to its excellent electrical conductivity. Copper windings generate an electromagnetic field when current passes through them, which interacts with the rotor's permanent magnets to produce motion. The motor also includes a position sensor and an electronic commutation drive control circuit, which are usually made from silicon-based semiconductors and other electronic materials for their precise electronic properties Leipole.net.
Outer Frame Composition
The outer frame of a DC fan is designed for durability and heat dissipation. Materials such as LM6 grade aluminium are popular for fan frames because of their high strength-to-weight ratio and excellent thermal conductivity.
How to Effectively Maintain the DC fan?
When using a DC fan, is there any situation where the fan fails immediately after it works? The DC fan is the same as other machinery and equipment. We need to maintain and check it from time to time for problems, so as to extend its service life.
During the operation of the DC fan, if it is found that the fan has abnormal sound, the motor is heating up, the shell is electrified, the switch is tripped, or cannot be started, it should be shut down immediately for inspection. In order to ensure safety, the fan is never allowed to be repaired in the running state. After the repair, a trial run should be carried out for about 5 to 10 minutes, and no abnormal phenomena should be confirmed before starting the operation.
The fan can only be operated under the condition that the fan is completely normal. At the same time, it is necessary to ensure that the power supply facilities have sufficient capacity and stable voltage. Long-term use of temporary power supply.
The operating environment of the DC fan should always keep the air unobstructed, dry and tidy. The surface of the fan should be kept clean. There should be no debris at the air inlet and outlet. Regularly remove dust and other debris from the fan and ducts.
Irregularly add or replace lubricating grease to the bearings according to the environmental conditions (motor enclosed bearings do not need to replace lubricating grease during the service life), in order to ensure good lubrication of the DC cooling fan during operation, the number of refueling shall not be less than The bearings and motor bearings are sealed for 1000 hours/time, and 1/3 of the inner and outer rings of the bearing are filled with zl-3 lithium-based lubricating grease. Running without oil is strictly prohibited.
The DC cooling fan should be stored in a dry environment to prevent the motor or motor from getting damp. When the DC cooling fan is stored in the open air, there should be defensive measures. During storage and handling, avoid bumping or strong impact from external forces to prevent the fan from being damaged.
Our Factory
Our target is to provide excellent quality and professional services. In the ever-changing global economic environment, AMR endeavors to work with customers for a better future.Based on the principle of quality first and customer first, AMR employs advanced technology and continuously improves product quality to meet the needs of customers. Our clients include Huawei, ZTE, Emerson, China Mobile, China Unicom, China Telecom, Southern Power Grid, as well as APC, Delta, Eltek and other famous customers both at home and abroad.
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