Everyone in the process of using the exhaust fan should encounter such a problem is the speed equipment instability phenomenon. I do not know how to deal with when faced with such a problem, the problem for many people is always very troublesome, can not find the best solution, today we, as a professional manufacturer, as we explain in detail to solve smoke fan speed cause of instability. For exhaust fan speed instability is caused by a lot of, for example, may be a problem due to the rectifier diode. There may be a problem with the SCR, it opens, shorts or poor internal contact. Again it may be too long adjustable resistance, prone to the phenomenon of poor access brushes and commutator between the rotor and the electronic still alive is bad toner, so you can debug resistance first and then tested. If you have other questions about the reason, please feel free to call for consultation. 

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