Product Description

Product Description

350mm Three Phase AC Ywf External Axial Cooling 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

Where can individuals or businesses find reliable information on selecting, installing, and maintaining AC motors?

When seeking information on selecting, installing, and maintaining AC motors, individuals and businesses can refer to various reliable sources. These sources provide valuable guidance, recommendations, and best practices related to AC motors. Here are some places where one can find reliable information:

  • Manufacturer’s Documentation: AC motor manufacturers often provide detailed documentation, including product catalogs, technical specifications, installation guides, and maintenance manuals. These documents offer specific information about their motors, such as performance characteristics, electrical requirements, mounting instructions, and recommended maintenance procedures. Manufacturers’ websites are a common source for accessing these resources.
  • Industry Associations: Industry associations related to electrical engineering, motor manufacturing, or specific applications (e.g., HVAC, pumps, or industrial machinery) can be excellent resources for reliable information. These associations often publish technical articles, guidelines, and standards that cover a wide range of topics, including motor selection, installation practices, efficiency standards, and maintenance recommendations. Examples of such associations include the National Electrical Manufacturers Association (NEMA), the Institute of Electrical and Electronics Engineers (IEEE), and the Air Conditioning, Heating, and Refrigeration Institute (AHRI).
  • Professional Electricians and Engineers: Consulting with professional electricians or electrical engineers who specialize in motor applications can provide valuable insights. These professionals possess practical knowledge and experience in selecting, installing, and maintaining AC motors. They can offer personalized advice based on specific project requirements and industry best practices.
  • Energy Efficiency Programs and Agencies: Energy efficiency programs and agencies, such as government departments, utility companies, or environmental organizations, often provide resources and guidance on energy-efficient motor selection and operation. These programs may offer information on motor efficiency standards, rebate programs for high-efficiency motors, and energy-saving practices. Examples include the U.S. Department of Energy (DOE) and its Energy Star program.
  • Online Technical Forums and Communities: Online forums and communities focused on electrical engineering, motor applications, or specific industries can be valuable sources of information. Participating in these forums allows individuals and businesses to interact with experts, discuss motor-related topics, and seek advice from professionals and enthusiasts who have firsthand experience with AC motors.
  • Books and Publications: Books and technical publications dedicated to electrical engineering, motor technology, or specific applications can provide comprehensive information on AC motors. These resources cover topics ranging from motor theory and design principles to practical installation techniques and maintenance procedures. Libraries, bookstores, and online retailers offer a wide selection of relevant publications.

When accessing information from these sources, it is important to ensure that the information is up-to-date, reliable, and relevant to the specific application or requirements. Consulting multiple sources and cross-referencing information can help verify accuracy and establish a well-rounded understanding of AC motor selection, installation, and maintenance.

induction motor

Are there different types of AC motors, and what are their specific applications?

Yes, there are different types of AC motors, each with its own design, characteristics, and applications. The main types of AC motors include:

  1. Induction Motors: Induction motors are the most commonly used type of AC motor. They are robust, reliable, and suitable for a wide range of applications. Induction motors operate based on the principle of electromagnetic induction. They consist of a stator with stator windings and a rotor with short-circuited conductive bars or coils. The rotating magnetic field produced by the stator windings induces currents in the rotor, creating a magnetic field that interacts with the stator field and generates torque. Induction motors are widely used in industries such as manufacturing, HVAC systems, pumps, fans, compressors, and conveyor systems.
  2. Synchronous Motors: Synchronous motors are another type of AC motor commonly used in applications that require precise speed control. They operate at synchronous speed, which is determined by the frequency of the AC power supply and the number of motor poles. Synchronous motors have a rotor with electromagnets that are magnetized by direct current, allowing the rotor to lock onto the rotating magnetic field of the stator and rotate at the same speed. Synchronous motors are often used in applications such as industrial machinery, generators, compressors, and large HVAC systems.
  3. Brushless DC Motors: While the name suggests “DC,” brushless DC motors are actually driven by AC power. They utilize electronic commutation instead of mechanical brushes for switching the current in the motor windings. Brushless DC motors offer high efficiency, low maintenance, and precise control over speed and torque. They are commonly used in applications such as electric vehicles, robotics, computer disk drives, aerospace systems, and consumer electronics.
  4. Universal Motors: Universal motors are versatile motors that can operate on both AC and DC power. They are designed with a wound stator and a commutator rotor. Universal motors offer high starting torque and can achieve high speeds. They are commonly used in applications such as portable power tools, vacuum cleaners, food mixers, and small appliances.
  5. Shaded Pole Motors: Shaded pole motors are simple and inexpensive AC motors. They have a single-phase stator and a squirrel cage rotor. Shaded pole motors are characterized by low starting torque and relatively low efficiency. Due to their simple design and low cost, they are commonly used in applications such as small fans, refrigeration equipment, and appliances.

These are some of the main types of AC motors, each with its unique features and applications. The selection of an AC motor type depends on factors such as the required torque, speed control requirements, efficiency, cost, and environmental conditions. Understanding the specific characteristics and applications of each type allows for choosing the most suitable motor for a given application.

China Custom 350mm Three Phase AC Ywf External Axial Cooling Fan Motor   vacuum pump ac system	China Custom 350mm Three Phase AC Ywf External Axial Cooling Fan Motor   vacuum pump ac system
editor by CX 2024-04-30