Product Description

Product Description

400mm 500mm External Rotor Motor Powered AC axial fan motor
Unlike conventional motors whose rotors are on the inside of a wound stator, external rotor motors have their rotor on the outside. This presents unique advantages to the fan manufacturer and user as detailed below:

An extremely compact, therefore space saving unit, is produced by utilising the external rotor component as the hub of a fan impeller.
Precision balancing is assured as the hub and impeller becomes 1 integrated unit of short axial length.
Heat is very effectively removed in the airstream, assisted by the fan impeller that acts as a rotating heat sink of appreciable surface area.
Speed control is then possible by low cost voltage variation because the extra heat generated in the rotor under speed control is lost directly into the airstream.
Air filters can be ‘saved’ when clean but ‘air flow compensated’ when dirty by the tendency of centrifugal fans to speed-up as flow resistance increases. The increase in speed is more pronounced when using external rotor motors.
In general, the external rotor principle leads to small efficient motors, ideal for saving space within equipment.


Fans housing stator and windings inside the rotor are compact, well-balanced, with widely adjustable rotation speed and good motor cooling. Built with insulation system (Class F) and integrated thermal protection. Axial fans are characterised by a series of unique properties of being quiet, robust and thermal-shielding. Useful in all those situations in a system with low pressure drop (therefore not very high resistance), the axial fans guarantee a large airflow rate.

The external rotor axial flow fan has the characteristics of compact structure, convenient installation, reliable operation, low noise, energy saving and high efficiency. The products are widely used in hotels, restaurants, industrial and mining enterprises, office buildings, theaters and other building facilities, as ancillary equipment for freezers and cold storage or for ventilation and heat dissipation. (For example, it is matched with refrigeration equipment or facilities such as supermarket freezers, ice machines, air coolers, chillers, condensing units, etc., and used with dehumidifiers, evaporators, side wall fans, fire fans, central air-conditioning fans and other equipment).

The outer rotor axial flow fan is composed of fan blades, outer rotor motor, net cover, lead wire and other parts. The structure of the fan is calculated by structural finite element, and the strength check, modal analysis, harmonic response analysis and other methods are carried out to ensure that our products have the advantages of stable and reliable structure, high safety factor, small vibration, and strong anti-interference ability! According to customer requirements, Thermal protectors, junction boxes and other components can be installed, or different installation methods such as cylinder type and box type can be selected. The blades are designed according to the principles of aerodynamics, acoustic principles and acoustic performance requirements. They are twisted according to certain rules from the tip to the root. The material is made of high-quality steel or plastic. After dynamic balance verification, it has good starting performance, stable operation and low noise. 

Product Parameters

Model Rated Voltage (V) Frequency
Input Power (W) Highest Speed (r/min) Volume
Noise db (A) Capacitor
YWF2D-200  380 50 0.25 80 2700 1080 122 57
YWF2E-200 220 50 0.30 70 2650 1050 120 56 2.5
YWF4D-200  380 50 0.20 50 1400 500 60 50
YWF4E-200  380 50 0.20 40 1400 510 55 50 1.5
YWF2D-250 380 50 0.25 105 2650 1850 192 65
YWF2E-250 220 50 0.53 115 2550 1800 190 65 4
YWF4D-250  380 50 0.23 55 1450 1250 60 55
YWF4E-250 220 50 0.30 60 1440 1230 60 55 2.5
YWF2D-300 380 50 0.28 140 2480 3250 205 66
YWF2E-300 220 50 0.80 180 2550 3300 210 66 6
YWF4D-300 380 50 0.25 70 1400 1950 70 60
YWF4E-300 220 50 0.35 75 1400 1950 70 60 3
YWF2D-350 380 50 0.72 400 2400 4850 225 73
YWF2E-350 220 50 1.80 400 2350 4750 223 72 10
YWF4D-350 380 50 0.45 130 1400 3270 93 64
YWF4E-350 220 50 0.55 125 1400 3270 93 64 4
YWF2D-400 380 50 1.05 580 2350 6480 240 74
YWF2E-400 220 50 2.40 510 2280 6100 240 80 12
YWF4D-400 380 50 0.60 180 1400 4800 125 68
YWF4E-400 220 50 0.90 190 1400 4800 125 68 6
YWF40D-450 380 50 0.53 210 1390 5410 155 70
YWF4E-450 220 50 1.25 280 1380 5380 150 69 10
YWF6D-450 380 50 0.42 155 950 4680 100 60
YWF6E-450 220 50 0.85 165 1390 4650 100 60 8
YWF4D-500 380 50 0.62 280 1390 8850 192 72
YWF4E-500 220 50 1.75 370 1390 8850 190 72 12
YWF6D-500 380 50 0.90 210 950 5800 125 65
YWF6E-500 220 50 0.90 230 950 5800 125 65 8
YWF4D-550  380 50 0.90 450 1350 10800 215 74
YWF4E-550 220 50 2.50 500 1350 10800 215 74 12
YWF6D-550 380 50 1.00 210 950 6500 135 68
YWF6E-550 220 50 1.10 300 950 6500 135 68 8
YWF4D-600 380 50 1.55 680 1380 13000 230 75
YWF4E-600 220 50 3.25 750 1380 13000 230 75 15
YWF6D-600 380 50 1.20 360 930 9600 150 70
YWF6E-600 220 50 1.40 450 900 9500 150 70 10


Installation dimensions

Model A B C D E K F G a b
200 220 270 220 270 210   110 148 12 53
250 270 320 270 320 260 270 120 148 12 53
300 320 370 320 370 310 320 125 158 12 53
350 370 420 370 420 365 375 130 168 12 41
400 420 470 420 470 415 425 140 181 12 57
500 520 570 520 570 515 525 155 183 12 57
600 610 670 610 670 615 625 209 218 12 57

Detailed Photos


After Sales Service

Our service:
 Marketing Service

100% tested CE certified blowers.Professional advice for model selection and further market development.

Pre-sales service: 
•We are a sales team, with all technical support from engineer team.
•We value every inquiry sent to us, ensure quick competitive offer within 24 hours.
•We cooperate with customer to design and develop the new products. Provide all necessary document.

After-sales service:
•We respect your feed back after receive the fan.
•We provide 1years warranty after receipt of fan..
•We promise all spare parts available in lifetime use.
•We loge your complain within 24 hours.

Please read these operating instructions carefully before starting to work with the device. Observe the following warnings to prevent malfunctions or physical damage to both property and people. These operating instructions are to be regarded as part of this device. If the device is sold or transferred, the operating instructions must
accompany it. These operating instructions may be duplicated and forwarded for
information about potential dangers and their prevention.

1.1 Levels of hazard warnings
These operating instructions use the following hazard levels to indicate potentially hazardous situations and important safety regulations:
Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. Compliance with the measures is mandatory.
Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. Exercise extreme caution while working.
Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury or damage of property.
A potentially harmful situation can occur and, if not avoided, can lead to property damage.
1.2 Staff qualification
The device may only be transported, unpacked, installed, operated, maintained and otherwise used by abled, qualified, trained and authorised technical staff. Only authorised specialists are permitted to install the device, to carry out a test run and to perform work on the electrical installation.
1.3 Basic safety rules
Any safety hazards stemming from the device must be re-evaluated once it is installed in the end device. Observe the following when working on the unit: Do not make any modifications, additions or conversions to the device without the approval.
1.4 Electrical voltage
Check the electrical equipment of the device at regular intervals, refer to Safety test. Replace loose connections and defective cables immediately

Company Profile

ZHangZhoug CHINAMFG Fan Co., Ltd. was established in 2003. It is a modern private enterprise focusing on the research, development, production and sales of ventilation equipment. The company is headquartered in Daxi Town, HangZhou City, ZHangZhoug Province, which is the “Hometown of Pumps in China”, and has branches across the country; the production base is located in the East New District of HangZhou City.

The main products of the company: all kinds of portable, mobile, oil-proof and moisture-proof axial flow fan series; medium, low and high pressure centrifugal fan series; boiler type draft fan series; mixed flow, diagonal flow fan series; industrial exhaust fan series; blower series and Y series; air compressor series and three-phase asynchronous motor, etc.; and can design and produce various non-standard and special exhaust equipment and special fans according to customer requirements.

Sincerely thank domestic and foreign customers for their long-term trust and love for A and B fans, and welcome you to visit and guide us at any time. With your support, we are more confident to manufacture ventilation equipment products that meet the needs of social development. Let us work together, help each other, coexist and prosper, and create unlimited business opportunities.


Q1: What’s the terms of trade?
A1: FOB,CFR,CIF or EXW are all acceptable.
Q2: What’s the terms of payment?
A2: T/T,L/C at sight or cash.
Q3: How long is your delivery time?
A3: Generally it is 5-10 days if the goods are in stock or it is 20-30 days if the goods are not in stock, it is according to quantity.
Q4: What is the advantage about your company?
A4: Our company has professional team and professional production line.
Q5: If we travel to China to checking your facility, are you welcome?
A5: Of course,  We will provide the whole accompany CHINAMFG your arrivial. Warm Welcome!
Q6: How Many Years of your company working in this industry?
A6: We have over 20-year experience in this field.

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Material: Iron
Usage: for Manufacture
Flow Direction: Axial Flow
Pressure: Low Pressure
Certification: RoHS
Color: Black


induction motor

Are there environmental considerations associated with the use of AC motors?

Yes, there are several environmental considerations associated with the use of AC motors. These considerations are primarily related to energy consumption, greenhouse gas emissions, and the disposal of motors at the end of their life cycle. Let’s explore these environmental considerations in detail:

  • Energy Efficiency: AC motors can have varying levels of energy efficiency, which directly impacts their environmental impact. Motors with higher efficiency convert a larger percentage of electrical energy into useful mechanical work, resulting in reduced energy consumption. By selecting and using high-efficiency AC motors, energy usage can be minimized, leading to lower greenhouse gas emissions and reduced reliance on fossil fuels for electricity generation.
  • Greenhouse Gas Emissions: The electricity consumed by AC motors is often produced by power plants that burn fossil fuels, such as coal, natural gas, or oil. The generation of electricity from these fossil fuels releases greenhouse gases, contributing to climate change. By employing energy-efficient motors and optimizing motor systems, businesses and individuals can reduce their electricity demand, leading to lower greenhouse gas emissions and a smaller carbon footprint.
  • Motor Disposal and Recycling: AC motors contain various materials, including metals, plastics, and electrical components. At the end of their life cycle, proper disposal or recycling is important to minimize their environmental impact. Some components, such as copper windings and steel casings, can be recycled, reducing the need for new raw materials and energy-intensive manufacturing processes. It is crucial to follow local regulations and guidelines for the disposal and recycling of motors to prevent environmental pollution and promote resource conservation.
  • Manufacturing and Production: The manufacturing and production processes associated with AC motors can have environmental implications. The extraction and processing of raw materials, such as metals and plastics, can result in habitat destruction, energy consumption, and greenhouse gas emissions. Additionally, the manufacturing processes themselves can generate waste and pollutants. Motor manufacturers can mitigate these environmental impacts by adopting sustainable practices, using recycled materials, reducing waste generation, and implementing energy-efficient production methods.
  • Life Cycle Assessment: Conducting a life cycle assessment (LCA) of AC motors can provide a holistic view of their environmental impact. An LCA considers the environmental aspects associated with the entire life cycle of the motor, including raw material extraction, manufacturing, transportation, use, and end-of-life disposal or recycling. By analyzing the different stages of the motor’s life cycle, stakeholders can identify opportunities for improvement, such as optimizing energy efficiency, reducing emissions, and implementing sustainable practices.

To address these environmental considerations, governments, organizations, and industry standards bodies have developed regulations and guidelines to promote energy efficiency and reduce the environmental impact of AC motors. These include efficiency standards, labeling programs, and incentives for the use of high-efficiency motors. Additionally, initiatives promoting motor system optimization, such as proper motor sizing, maintenance, and control, can further enhance energy efficiency and minimize environmental impact.

In summary, the environmental considerations associated with the use of AC motors include energy efficiency, greenhouse gas emissions, motor disposal and recycling, manufacturing processes, and life cycle assessment. By prioritizing energy efficiency, proper disposal, recycling, and sustainable manufacturing practices, the environmental impact of AC motors can be minimized, contributing to a more sustainable and environmentally conscious approach to motor usage.

induction motor

How do AC motors contribute to the functioning of household appliances?

AC motors play a crucial role in the functioning of numerous household appliances by converting electrical energy into mechanical energy. These motors are used in a wide range of devices, powering various components and performing essential tasks. Let’s explore how AC motors contribute to the functioning of household appliances:

  • Kitchen Appliances: AC motors are found in various kitchen appliances, such as refrigerators, freezers, dishwashers, and blenders. In refrigerators and freezers, AC motors drive the compressor, which circulates the refrigerant and maintains the desired temperature. Dishwashers use AC motors to power the water pumps, spray arms, and the motorized detergent dispenser. Blenders utilize AC motors to rotate the blades and blend ingredients.
  • Laundry Appliances: AC motors are integral to laundry appliances like washing machines and clothes dryers. Washing machines rely on AC motors to power the agitator or the drum, facilitating the washing and spinning cycles. Clothes dryers use AC motors to rotate the drum and operate the blower fan, facilitating the drying process.
  • Vacuum Cleaners: Vacuum cleaners utilize AC motors to generate suction and drive the motorized brush or beater bar. These motors power the fan or impeller, creating the necessary airflow for effective cleaning.
  • Fans and Air Circulation: AC motors are employed in various types of fans, including ceiling fans, table fans, and pedestal fans. These motors drive the fan blades, producing airflow and facilitating air circulation to provide cooling or ventilation in rooms. Additionally, AC motors power exhaust fans used in kitchens, bathrooms, and range hoods to remove odors, smoke, or excess moisture.
  • Air Conditioning and Heating Systems: AC motors are critical components in air conditioning and heating systems. They power the compressor, condenser fan, and blower fan, which are responsible for circulating refrigerant, dissipating heat, and delivering conditioned air throughout the house. AC motors enable the regulation of temperature and humidity levels, ensuring comfort in residential spaces.
  • Garage Door Openers: AC motors are utilized in garage door openers to drive the mechanism responsible for opening and closing the garage door. These motors generate the necessary torque to lift or lower the door smoothly and efficiently.
  • Other Appliances: AC motors are also found in a variety of other household appliances. For instance, they power pumps in water heaters, swimming pool filters, and sump pumps. AC motors are used in dehumidifiers, humidifiers, and air purifiers to drive the fans and other internal components. They are also present in audiovisual equipment, such as DVD players, record players, and fans used for cooling electronics.

In summary, AC motors are essential components in household appliances, enabling their proper functioning and delivering the mechanical energy required for various tasks. From kitchen appliances to laundry machines, fans, air conditioning systems, and more, AC motors provide the necessary power and functionality to enhance our daily lives.

induction motor

What is an AC motor, and how does it differ from a DC motor?

An AC motor, also known as an alternating current motor, is a type of electric motor that operates on alternating current. It converts electrical energy into mechanical energy through the interaction of magnetic fields. AC motors are widely used in various applications, ranging from household appliances to industrial machinery. Here’s a detailed explanation of what an AC motor is and how it differs from a DC motor:

AC Motor:

An AC motor consists of two main components: the stator and the rotor. The stator is the stationary part of the motor and contains the stator windings. These windings are typically made of copper wire and are arranged in specific configurations to create a rotating magnetic field when energized by an alternating current. The rotor, on the other hand, is the rotating part of the motor and is typically made of laminated steel cores with conducting bars or coils. The rotor windings are connected to a shaft, and their interaction with the rotating magnetic field produced by the stator causes the rotor to rotate.

The operation of an AC motor is based on the principles of electromagnetic induction. When the stator windings are energized with an AC power supply, the changing magnetic field induces a voltage in the rotor windings, which in turn creates a magnetic field. The interaction between the rotating magnetic field of the stator and the magnetic field of the rotor produces a torque, causing the rotor to rotate. The speed of rotation depends on the frequency of the AC power supply and the number of poles in the motor.

DC Motor:

A DC motor, also known as a direct current motor, operates on direct current. Unlike an AC motor, which relies on the interaction of magnetic fields to generate torque, a DC motor uses the principle of commutation to produce rotational motion. A DC motor consists of a stator and a rotor, similar to an AC motor. The stator contains the stator windings, while the rotor consists of a rotating armature with coils or permanent magnets.

In a DC motor, when a direct current is applied to the stator windings, a magnetic field is created. The rotor, either through the use of brushes and a commutator or electronic commutation, aligns itself with the magnetic field and begins to rotate. The direction of the current in the rotor windings is continuously reversed to ensure continuous rotation. The speed of a DC motor can be controlled by adjusting the voltage applied to the motor or by using electronic speed control methods.


The main differences between AC motors and DC motors are as follows:

  • Power Source: AC motors operate on alternating current, which is the standard power supply in most residential and commercial buildings. DC motors, on the other hand, require direct current and typically require a power supply that converts AC to DC.
  • Construction: AC motors and DC motors have similar construction with stators and rotors, but the design and arrangement of the windings differ. AC motors generally have three-phase windings, while DC motors can have either armature windings or permanent magnets.
  • Speed Control: AC motors typically operate at fixed speeds determined by the frequency of the power supply and the number of poles. DC motors, on the other hand, offer more flexibility in speed control and can be easily adjusted over a wide range of speeds.
  • Efficiency: AC motors are generally more efficient than DC motors. AC motors can achieve higher power densities and are often more suitable for high-power applications. DC motors, however, offer better speed control and are commonly used in applications that require precise speed regulation.
  • Applications: AC motors are widely used in applications such as industrial machinery, HVAC systems, pumps, and compressors. DC motors find applications in robotics, electric vehicles, computer disk drives, and small appliances.

In conclusion, AC motors and DC motors differ in their power source, construction, speed control, efficiency, and applications. AC motors rely on the interaction of magnetic fields and operate on alternating current, while DC motors use commutation and operate on direct current. Each type of motor has its advantages and is suited for different applications based on factors such as power requirements, speed control needs, and efficiency considerations.

China supplier 400mm 500mm External Rotor Motor Powered AC Axial Fan Motor   vacuum pump engine	China supplier 400mm 500mm External Rotor Motor Powered AC Axial Fan Motor   vacuum pump engine
editor by CX 2024-05-14