Motor running or failure, can see, hear, smell, touch four methods to prevent and troubleshooting in
time, guarantee the safe operation of motor. Look, observe the motor running with and without
exception, in the process of its main performance for the following situation. 1. The stator winding
short circuit, may see the motor smoke. 2. The serious overload or short of motor phase operation,
motor run normally, but suddenly stops, will see the wiring loose sparks; A portion of the blown fuse
or stuck. 4. If the motor vibration, could be gearing jammed or motor fixed, loose bottom bolt, etc.
5. If the motor inside contact point and forms a discoloration, burn mark and stain, then there may
be local overheating, poor contact or winding conductor joint burned, etc. Second, listening to the
normal operation of the motor should be a uniform and lighter "buzzing" sound, no noise and special
voice. If the noise is too big, including electromagnetic noise, bearing noise, ventilation, noise,
mechanical friction sound, etc., may be failure precursor or failure phenomenon. For electromagnetic
noise, if the motor send out the voice of high and low and heavy, the reason may have the following
kinds. (1) the uneven air gap between stator and rotor, the voice of high and low and high and low
time interval constant, this is so that the stator and rotor bearing wear and tear caused by a heart.
(2) three phase current balance. This is by three-phase winding grounding, short circuit or poor
contact, if sound is very depressing, serious overload or short of motor phase operation. (3) the
iron core is loose. Due to vibration in the operation of the motor in the core fixed bolt looseness
motor part caused by loose core
silicon steel sheet, making noises 2. The bearing noise, should often listen in the motor running. Monitoring method is: will the screwdriver end to resist bearing installation site, on the other side, close to the ear can hear bearing operation. If the bearing is working well, its sound is continuous and tiny "rustling" sound, does not have the change of high and low, and metal. If appear
the following voice is not normal. (1) bearing operation "creak" sound, this is metal, generally for
bearing caused by lack of oil, should be apart bearing charging right amount of grease. (2) if there
"pumping mile", this was the voice of the ball rotates, generally for dry or lack of oil, grease can
be loaded with a moderate amount of grease. (3) if there "raise price" or "creak" sound, for the
bearing inner ball irregular movement of sound, this is the inside of the bearing ball or motor
long-term need not, grease caused by the
asynchronous motor drought. 3. If the drive mechanism and
transmission mechanism continuous instead of high and low sounds, processing can be divided into the following kinds of situation. (1) periodic "snapped" sound for belt joint is not smooth. (2) periodic
"drumming sound for loose coupling, or between the pulley and shaft and key or keyways wear cause.
(3) uneven clash, as the wind leaf fan cover cause collision. Three, smell smells odour of a motor
through diagnosis, and can also prevent failure. If found to have special smell of paint, the
internal temperature of the motor is too high; If found to have a heavy, focal smell the smell of
burnt food or may be insulation breakdown or winding has been burned. Four, touch the temperature of
the motor to some parts also can determine the cause of the problem. Application in order to ensure
safety, when using a touch of the hand to touch an electric shock around motivation shell, bearing
parts, if discover the abnormal temperature, the reason may have the following kinds. 1. Poor
ventilation. Such as fan, air duct jam, etc. 2. The overload. Cause excessive current and the stator
winding overheating. 3. The stator winding interturn short circuit or three phase current balance. 4.
The frequent start or braking. Around 5. If the bearing temperature is too high, it may be caused by
bearing damaged or short of oil.
