FAQ_Shenzhen Bingfeng Electronics Technology Co., Ltd

What to learn more about fans? What is a motor? What is system impedance?The answers to these and more can be found below.

When is an Axial Fan estimated to be changed?

The axial flow fan must be replaced before stopping rotation. The following changes will occur before the end of its service life:

1. The rotational speed gradually decreases

2. Increased noise

3. Abnormal noise generation

What is a 3-wire fan?: A three wire fan is a fan with a rotational signal output, used to detect speed. It is called a tachometer function output.

What is a ball bearing fan?: There are several miniature steel balls around the cylinder of the ball bearing fan. When the fan rotates, the balls also rotate accordingly. Compared with sleeve bearings, the friction is smaller and there is no oil leakage problem. Therefore, The service life is longer.

What is a sleeve bearing fan?: Sleeve bearing is a type of bearing that rotates by oil or lubricant. The frictional contact between sleeve bearing and shaft is surface friction. Surface friction produces higher noise levels and temperatures. The higher the temperature caused by friction, the greater the possibility of oil leakage. In addition, uneven contact usually leads to high temperatures and abnormal noise, which may cause fan failure. The service life of sleeve bearing fans is about 20K to 30K hours, It is 1/2 of the service life of the ball bearing fan.

Do fan blade shape and number of blades matter?: The shape and number of blades of different fans can affect airflow and air pressure. The more fan blades there are, the higher the air pressure generated, and the more difficult it is to maintain the mold. Therefore, special attention must be paid to its overall performance, including balance, noise level, and service life.

What's the difference between noise level and abnormal noise?: The noise level is measured by an anechoic chamber. It is the sound generated by normal friction between airflow and mechanical structures. Abnormal noise may come from poor assembly, mechanical tolerances, or component failures.

How to choose the appropriate fan for our equipment?

Regarding selecting the appropriate fan for your device, users can choose based on the following:

1. Optimize airflow efficiency

2. Minimize size and fit as much as possible

3. Minimize power consumption to the greatest extent possible (if the system power is powered by batteries)

4. Maximize service life

5. Reasonability of calculating total costs

When choosing a general-purpose fan, the following methods can be used.

1. Determine the heat generated inside the equipment

2. The allowable temperature rise inside the equipment

3. Calculate the air volume requirements based on the equation

4. Estimate the system impedance in the unit

5. Select the fan based on the performance curve displayed in the catalog table

What is an IP rating?: IP rating is an international standard for rating motors in response to the impact of dust.

What are some general guidelines on mounting fans and blowers?: Fans with sleeve bearings are generally installed on a horizontal shaft. In exceptional cases, please discuss with our engineering directly. Ball bearing fans can be installed in any direction.

How do you read an air performance curve?: The vertical axis (Y axis) is pressure (inches water or pascals). The horizontal axis (X axis) is flow (CFM or M3H). The curve displays the fan delivery characteristics of specific pressure flow points.

Do you have a thermostatically controlled fan?: Eiskuhl's Axial fan and Blower fan can be controlled by a thermistor (a device that changes resistance with temperature).

Does Eiskuhl build fans, blowers, or motors with moisture or corrosion protection?: Yes, Eiskuhl produces various Axial fans and blower fans. Its materials can provide moisture-proof and anti-corrosion grades. Plastic, Steel, and Aluminum or Stainless steel alloys are used for casings, impellers, and Fan Shafts. The internal protection level of moisture-proof motors is IP44 or IP54 Grade.

How can you change the voltage?: The voltage reduction of Axial fans can be achieved through resistors, variable speed AC transformers, or solid-state speed control.

How do you change speed motor control?: The speed of the Fan motor can be changed through various methods. The design of the motor can be changed, and the applied voltage or frequency can also be changed.

Are the blowers available with European voltages and approvals?: Yes, most models are produced according to European standards and have the same air delivery capacity. If models that do not use European voltage design are required, a minimum production order quantity can be provided. Most models designed for European voltage are manufactured according to VDE specifications.

Can all 60Hz blower motors operate on a frequency of 50Hz?: No. Only when specifically designed to operate at 50/60Hz can it be used simultaneously, otherwise each motor must be evaluated based on specific circumstances.

What is the minimum recommended starting voltage for AC blower motors?: General, 75% of the rated voltage of the blower motor is required to start the motor. For example, the minimum starting voltage is 120x0.75=90V

Has the blower motor been approved by institutions in the United States and Canada?: Yes, Most models are UL and CCC certified and can be used in the United States and Canada. For certification issues related to special models, please consult Eiskuhl's application engineer.

What are air performance curves?: The air performance curve is a graph that displays the airflow characteristics of Axial fan, including airflow(cfm) and static pressure, as well as airflow(cfm) and blower speed(RPM).

What is the life expectancy of a fan?: We have marked the expected lifespan of all Cooling fans. Ball bearings are represented by a lifespan of 50000 hours. 50K refers to the time that can be reached in most usage environments, and after more than 50K hours, 90% of fans can still operate normally.

Does your factory have own Design and Engineering department?: Yes, Of course, Over 10 people in engineering team. And Over 5 people in R&D department.

What is the delivery time for production: The normal delivery time is 12-20 days, Excluding OEM and ODM products.

Are you a fan trading company, distributor or manufacturer?: We are a cooling fan manufacturer with over 10 years of production experience and have UL and CE certifications. We are mainly China agents for Delta brand fans.