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Performance indicators of electric vehicle cooling fans

Time: 2020-09-10

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Performance indicators of electric vehicle cooling fans

The cooling fan of an electric vehicle is an important part of the cooling system. When designing the cooling fan, the following performance indicators need to be met to be called a qualified vehicle cooling fan to achieve the effect of heat dissipation.

 

Vehicle cooling fan


1) Output power

 

Under the specified requirements, the speed of the cooling fan generally requires 1600-4000r/min, and the rated power can only be reached when the rated speed is reached. For the cooling fan, it is necessary to ensure that it can output at full load for a long time.

 

2) Start control

 

The starting process refers to the process in which the motor speed rises from zero to a stable value. For a brushless DC motor, due to its small internal resistance, the current rapidly increases when starting, which will cause the back EMF to increase, and it will also suppress the current increase. After the current increase reaches the maximum value, it will start to decrease. The current at starting is much larger than the stable operating current, which is about 6-7 times the stable current. The power circuit will bear a larger current and electromagnetic interference will also be great. Starting performance is one of the key indicators of cooling fans. Generally speaking, it is required to be safe, reliable, fast and stable, and can be started and stopped at will.

 

Car cooling fan


3) Working voltage

 

Taking new energy vehicles as an example, the requirements for cooling fans working in 12V systems are as follows:

 

Does not work below 9V

9-16V normal work

16-18V shutdown, but cannot be damaged

18-24V can withstand at least 1h

The control circuit above 24V is damaged and protected by a fuse.


4) Noise control

 

Generally speaking, the higher the speed, the greater the air volume, and the greater the noise. At present, the general size of cooling fans is relatively large, and most of the cooling fans rotate at 1600-4000r/min. There are special noise testing methods for noise, which need to be optimized from both hardware and software aspects.

 

In addition to the above four goals, the designed electric fan also needs to have motor protection mechanisms, such as stall protection, short circuit protection and overcurrent protection, overvoltage protection and undervoltage protection.

 

vehicle cooling fans


Buying the automobile cooling fan sold by Suzhou Santian Precision Mould Co., Ltd. not only meets the above indicators, but also has a favorable price, and provides comprehensive after-sales service. If you have any needs, please contact us.

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