What is the buzz of electric motors?
Motor shake, and sometimes start or speed are likely to issue this sound, starting the motor is difficult, heavy load! Speed, it is estimated that the problem of the controller to speed up the disguised speed, resulting in motor more than the rated speed!
It may be because time is too long, aging of magnetic steel. OK, except for a little noise, nothing else. You can use it normally. The motor can be used for ten years under normal conditions.
Normal condition. Motor noise, generally motor quality problems, but does not affect the use
