Answers about fan noise from automobile radiator fan factory

Answers about fan noise from automobile radiator fan factory I believe that when purchasing a cooling fan, in addition to the requirements for the air volume and pressure of the fan, the noise level of the fan is also an important reference when purchasing. Q What is noise? First of all, we need to understand what noise is? From the physiological point of view, all sounds that hinder people from normal rest, study and work are noise. As a device that can change the direction of airflow, the cooling fan is inevitable to produce noise during work. Q How does the noise occur? In fact, the essence of noise is sound, and sound is produced by the vibration of an object. Therefore, we need to know where the vibration occurs when the fan is running. Based on this, we can roughly divide noise into the following three types. Electromagnetic noise Electromagnetic interference noise is mainly generated between the stator and the rotor. When the fan is running, the harmonic magnetic field in the air gap between the stator and the rotor and the resulting force wave will be generated between the amplitude, frequency and magnetic series. Rotating force or pulsating force waves cause noise when the magnetic field is switched, which is the so-called electromagnetic noise. Mechanical noise Mechanical noise is the sound produced by the interference and friction of different parts when the fan is running. We usually consider it as abnormal noise. Aerodynamic noise Aerodynamic noise is the main source of noise from cooling fans. The sound generated when the fan blades are tangent to the air when it is running is mainly determined by the fan type, the fan, the ventilation duct and the structural design of the inlet and outlet. Q How to reduce noise? Knowing the noise source and production process of the cooling fan, how can we control the noise, an important indicator? In view of the above three types of noise, the automobile radiator fan factory has adopted different methods to reduce the noise of the fan. Improved circuit For electromagnetic interference noise, our company has optimized the control circuit on the cooling fan, using a sine wave drive circuit, a π-type filter circuit, etc., to prevent the coil current from undergoing abrupt changes, and fundamentally weaken the generation due to magnetic field changes. Electromagnetic noise. Quality Control In response to mechanical noise, our company has adopted a comprehensive quality management system to standardize the selection and inspection of raw materials, and eliminate the mechanical noise caused by poor fan components from the source. Professional team For aerodynamic noise, our company has a professional Ru0026D team and experimental equipment, combined with years of experience, conducted a large number of experiments in the early stage of product development, processed according to the experimental data, and selected one of them with good performance and low noise The combination of leaf shape and structure. The above points are some of the measures for noise control of fans in the development and production stages. Client measures In addition, in the process of delivering fans to customers, noise reduction can also be done through some corresponding methods. Reduce the system impedance. The air inlet and outlet of a system shell account for about %~% of the system impedance. The greater the system impedance, the greater the maximum air volume required by the fan and the greater the noise, so the system impedance is minimized. The maximum air volume of the required fan is also reduced to a minimum, and the noise can be reduced by matching a fan with a suitable fan frame and blade combination. Reduce the turbulence of the flow field. The obstruction of the air flow path driven by the fan will produce turbulence noise. Therefore, the interference of obstacles in the fan flow channel should be minimized, especially any obstructions at the air inlet and outlet should be eliminated to achieve reduction. The purpose of noise is to reduce the vibration of the cooling fan. When the client is assembling the fan, you can consider whether to use a soft and elastic anti-vibration pad according to the location of the fan, which can reduce the abnormal noise caused by fan vibration or resonance. When the control voltage changes, the speed will also change and affect the noise level. The greater the voltage, the faster the speed, and the greater the noise. Therefore, the noise can be reduced by controlling the fluctuation of the voltage and using an appropriate voltage. Appropriate size The size of the cooling fan increases or decreases in proportion to the noise, so you can consider using a fan with a lower speed. Under the same air volume requirements, use a larger fan with a lower speed to reduce noise. Reduce the damage during use. Due to its high speed and high noise requirements, the internal structure of the cooling fan is relatively fragile. Therefore, it is necessary to pay attention to the damage to the fan during use. In order to reduce unnecessary drop collisions and reprocessing, our company can provide cooling fans with additional sleeves and terminals. Clients can also contact our company if they have special requirements. We will do our best to meet customer needs. Solution We want to say that the automobile radiator fan factory has been deeply involved in the field of heat dissipation for more than 20 years. The noise of the fan is inevitable. What we can do is to reduce it as much as possible. While constantly trying various noise reduction solutions, we have been committed to providing customers with better heat dissipation solutions. Plans, customized services, consider more details for each customer, and strive to provide customers with more satisfactory cooling solutions! Original text and link: 'Decryption|Auto radiator fan factory's answering time on fan noise' Recommended reading 'Cooling fan noise test and the best way to reduce fan noise' 'Silent fan and decibel level analogy' Technical guidance: car radiator fan Factory Ru0026D Department