Each size, each operating voltage, and each PCB type of 3PCS axial flow fan with a maximum rotational speed were subjected to accelerated aging tests in an oven at 90 °C. This test condition is representative of the worst operating conditions This is because the test temperature is 20 °c higher than the maximum working temperature of 70 °C indicated in the product specification. For example, for the following 1225 models, we test 3PCS axial flow fan samples for each model number; R1225H05B 05V, H speed, R type R1225Y12B 12V, Y speed, R type R1225Y24B 24V, Y speed, R type G1225Y24B 24V, Y speed, R type G1225Y48B 48V, Y speed, R type product parameters including operating current, speed, speed, temperature rise and noise, must be measured and recorded before life testing begins. Then the life test can begin and the starting date is recorded. The axial flow fan prototype during the life test must be inspected daily or at least twice a week. The following parameters are set as the failure criteria. Rotate speed down to 30% of original speed B. The current is increased by 30% over the rated value C. Axial-flow fan stopped D. Any noise due to deformation of the frame, or any other abnormal noise, of course the actual DB value of the noise will not be tested at this time. When the failed Fan samples are removed from the high temperature chamber, they must be carefully examined and analyzed to find out the real cause of the failure of the axial fan, while the other two fan samples will continue to be tested until they fail. Compared with the industry, our calculation is that the product life depends largely on the working environment temperature and the temperature rise of the product itself, so the temperature rise of the product is effectively taken into account The average life of the product also depends on the speed: The higher the speed, the shorter the life. Based on the axial fan samples, the life test results show that the life decreases by 25% for every 12% increase in speed. Please note that the maximum life of a general bearing is 150000 h due to the bearing life limit (bearing fatigue) .

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