The industrial fan has been continuously innovating in the field of technology as market demand changes. The low-speed and high-wind industrial fan is driven solely by a motor. Although many manufacturers now use small-sized, low-noise permanent magnet brushless synchronous motors, there is still some noise in quiet environments. We should understand the sources of noise from industrial fans.
The primary cause of noise in industrial fans is the vibration generated when the motor rotates. Vibration is inevitable when the motor rotates and cannot be avoided at present. However, the noise generated by the vibration is generally not significant, and most people can tolerate it.
The second reason for noise in large industrial fans is the wind noise generated by the fan blades during operation. When the fan blades rotate, the pulsating pressure distribution of the airflow on the blades generates noise. Or the uneven distribution of the pressure on the blades and the disturbance to the surrounding gas and parts during rotation also constitute noise. For fans with large air volume and wind pressure, their wind noise is also louder.
The third reason is that industrial fans may produce abnormal noises or even malfunctions. Wind noise sounds like simple wind noise, while abnormal noises are different. When a large fan is in operation, if there are other sounds besides wind noise, it can be judged that the fan is making abnormal noises. Abnormal noises may be caused by foreign objects or deformation inside the bearings, collision due to improper assembly, or uneven winding of the motor coil, which may cause looseness and produce abnormal noises.
The source of noise from industrial fans is related to motor vibration and fan blade wind noise. The higher the fan speed and wind strength, the louder the noise. The noise of industrial fans is closely related to their own vibration. However, while the first two reasons are difficult to overcome, we can choose products of higher quality when purchasing and try to use larger-sized fans. Under the same air volume conditions, the working noise of large fans at lower speeds is smaller than that of small fans at high speeds.