Micro Cooling Fan in effect

"Micro Cooling Fan" is also known as a fan and a fan, it is common in our daily lives, one appliance. Fan does not turn on with respect to this fan is a decoration, it did not play to its intended effect. Therefore, we should know the cause of this electric fan motor does not turn what appears. When the "Micro Cooling Fan" does not turn, we should first consider the motor lubrication is not enough. Like how to judge it? If, after we remove the blades, the normal rotation of the shaft, fan placement can not turn up, and after we disconnect the power, gently struck fan, found "Micro Cooling Fan" fan rotating some stiff and it shows a lack of oil. Whereas if it is very easy to turn freely, indicating oiled, on looking for other reasons.