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| Analysis on Failure of Micro Axial Fan in Low-temperature Environment |
| Received:March 21, 2013 Revised:August 15, 2015 |
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| DOI：10.7643/issn.1672-9242.2015.04.030 |
| KeyWord:axial fan BLDC failure failure mechanism |
| Author | Institution |
| HU Jia-yu |
Southwest Institution of Electronic Technology， Chengdu ， China |
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| Abstract: |
| Objective To study the issue of failure of axial fan in low temperature. Methods Through research of the mechanical structure and the driver's circuit system of the typical axial fan in the market and commonly used in engineering, the composition of the diver circuit board of normal products was analyzed. The integrated analysis was conducted on the failure issue in the current environmental conditions by replacement method. Results The rotary resistance of the micro axial fan increased due to congelation of lubricating oil after long-term storage in low temperature. In combination, the low temperature accelerated the special failure mechanism of the bearing, making the increase of the rotary resistance of the rotor even greater. In addition, during the electrical start-up process, compared to normal temperature, the locked-rotor current of the brushless DC motor (BLDC) increased by over 2 times due to the small resistance of circuit at low temperature, thus causing overburning of the motor driver circuit. Meanwhile, due to motor stalling, the heat damage of the motor iron increased and the long-term stalling further caused burning of enamelled wire thus leading to the total burning of the fan motor. Conclusion In contrast to the general thought that failure at low temperature rarely appears, the burning situation of fan occurs during the process of one-time or multiple startup after storage in low temperature due to congelation of lubricating oil and acceleration failure of bearing. |
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