DC cooling fan of the relationship between the noise voltage and speed

DC cooling fan USES a DC voltage power supply, the commonly used DC cooling fan voltage is 5 v, 12 v, 24 v, 48 v, the voltage of the height and speed has relationship? 1. A molding of DC cooling fan, the input voltage is lower, the speed will be decreased, and, of course, the high input voltage, speed will rise generally, when after reaching and limit, voltage rise, the rotating speed is constant, only higher current, the voltage is too high, higher current, may burn out motor 2 chip. The same size of DC cooling fan, the speed of the high voltage when general can do a little higher, power will be bigger. 3. The lower voltage, speed can be lower relatively, can start, quiet during operation. DC cooling fan noise, is a relatively common problems, such as our commonly used car DC cooling fan, the projector in the DC cooling fan, switches, humidifier, frequency converter on the DC cooling fan is more or less will have this problem, what reason is this? Basically has the following several reasons: 1. Bearing problems, the use of oil bearing of DC cooling fan, prone to noise problems, especially in high temperature environment and environment with dust, 2 more noise. Blades were not smooth operation. 3. Electromagnetic acoustic besides above these three, is the mechanical problems, if there is something touch blade ring, in addition, the speed is too high will ring. Wenling city chi automotive air conditioning technology co. , LTD was founded in 2002 in wen ling, is a focus on research and development, production, sales, radiator cooling fan of high-tech enterprises. Produced dc cooling fans, ac cooling fan, blower, waterproof/dustproof cooling fan, EC conversion and the cooling fan, radiator dc cooling fan, car radiator cooling fan, mute radiator cooling fan, radiator cooling fan, turbo cooling fan, dc dc cooling fan, centrifugal fan, blower, air blower factory, new energy dc cooling fan, brushless motor, etc. , has been widely used in: communications equipment, UPS power supply, medical equipment, electric welding machine, industrial control equipment, household electrical appliances, air purification industry, automobile industry, projectors, beauty equipment, sports equipment, and other areas of the industry.