On some special occasions,DC cooling fanThe working environment temperature is very high, for example: car LED headlights, stage lights, fire-fighting robots, etc. so, dc cooling fan power much temperature?
The working temperature of the conventional cooling fan is -10 degrees -70 degrees. If the ambient temperature is higher than 70 degrees, the general product can not be applied, you need special planning.
First, the circuit part should use high temperature resistant drive IC, high temperature resistant peripheral electronic equipment (resistors, capacitors, diodes, etc.) and reliable drive circuit planning. If the car body is used, the requirements for reliability will be even higher, and it is necessary to use meta-equipment that meets the AEC-Q100.
Two: the magnetic circuit part of the planning to use the permanent magnet with better temperature resistance, such as sintered ferrite. Traditional rubber magnets may produce mechanical deformation in extreme high temperature environments, so they are not suitable for high temperature electric fans. In addition, the higher price of NdFeB strong magnet is not suitable for high temperature resistant electric fan, because it is obvious demagnetization in the environment above 85 degrees. The excitation coil should use a higher temperature resistance level, enameled wire at least 180 degrees of temperature resistance level.
Three: bearing part planning is more important. If the high temperature longevity requirement is necessary, then the double ball bearing structure is particularly necessary, and it is necessary to use high temperature ball bearings, the general bearing is not competent for high temperature environment. The disadvantage of double ball bearings is that as the use time increases, the noise will increase, which is also unbearable in some occasions, such as car LED headlights, once the sharp ball conflict noise is transmitted to the cockpit, It will make people extremely uncomfortable. In this case, the oil bearing with high temperature resistance and better mute effect will be used. Although the definite life of oil bearing is not as high as that of ball bearing, its mute effect is unparalleled. Of course, the general oil bearing high temperature environment, the number of life is very short, the main reason is the evaporation of lubricating oil run. The use of oil bearing once there is a good structural planning, good oil retaining structure, good dustproof structure, in high temperature environment, cost performance and comprehensive function is still very advantageous. At present, many mainstream car lamp factory heat dissipation fans use oil bearing structure as the first choice for high temperature resistant electric fans.
Four: good motor structure planning also helps to achieve high temperature resistance. For example, the adoption of coreless hollow coil structure, the motor itself power high temperature rise, making the motor more reliable.
Five: The fan blade data of the casing should be high temperature resistant data, and the wire harness should also be high temperature resistant wire. The same is true for other glue types.
To sum up, a high-reliability high-temperature electric fan is not so easy to plan and produce. A good heat dissipation electric fan should operate without failure under the operating environment of -40~125 ℃, and the continuous operation under the high temperature environment of 120 ℃ should not be less than 6000Hr.
Therefore, if the cooling fan is customized, it is necessary to find a large manufacturer to be safe and secure!