Fast search for motor fault 10

Observe the motor running process of the exception, the main performance of the following circumstances.

1 when the stator winding short-circuit, may see the motor smoke.

2 Motor severe overload or lack of phase running, the speed will slow and have a heavy "buzz" sound.

3 normal operation of the motor, but when the sudden stop, will see the wiring loose from the spark; fuse fuse or a part stuck and other phenomena.

4 if the motor vibration, it may be stuck or fixed gear motor, bad foot bolt loosening.
. if motor inner contacts and discoloration of the connection, burn marks and smoke trail etc., may have local overheating, conductor connections contact undesirable or winding burn.

Two. Listen to

The motor is normally run and should emit a uniform and lighter "buzzing" sound, without a murmur and a special sound.. If the noise is too large, including the electromagnetic noise, bearing noise, ventilation noise, mechanical friction sound, etc., are likely to be a warning or failure phenomenon.

1 for electromagnetic noise, if the motor sends a high and low and heavy sound, then the reasons may have the following.

(1) the air gap between the stator and the rotor is not uniform, the sound is suddenly and the high and the low sound interval time is the same. This is the bearing wear which causes the stator and the rotor to be concentric..

(2) three-phase current imbalance. This is the three-phase winding existence of ground, short circuit or contact with bad reasons, if the sound is very boring, motor severe overload or lack of running.

(3) iron core loose. The motor in operation causes the iron core to loosen the iron core due to vibration and the loose iron core silicon steel sheet is loosened and the noise is emitted..

2 for the bearing noise, should be frequently monitored in the motor operation. Monitor method is: the screwdriver at one end of the bearing installation site, the other end close to the ear, then can hear the sound of the bearing.. If the bearing is normal, the sound is continuous and tiny "rustle", there is no fluctuation and metal friction sound.. The following sounds are not normal.

(1) a "squeak" sound when the operation of the bearing, which is metal friction sound, the general bearing is short of oil caused by, should open bearings filling amount of grease.

(2) if there is "Gee miles" sound, which is ball rotation of a voice, is generally a lack of oil or grease dry cause, filling grease amount.

(3) if there is a "Titicaca" sound or "crunch" sound, for bearing ball irregular movement and sound. This is bearing ball damage or the motor is not a long time, due to the grease dried up.

3 if the transmission mechanism and the transmission mechanism is issued a continuous rather than a high and suddenly low voice can be divided into the following circumstances.

(1) periodic "flap" sound, caused by belt joint is not smooth.

(2) periodic "Dong" sound, for coupling or pulley and the shaft and a key or a key groove wear caused by loose.

(3) the uneven impact sound is caused by the fan cover for the fan fan..
Three, smell

By smell the motor smell can also judge and prevent failure. If found to have special smell of paint, inside the motor temperature is too high; if there is a very heavy paste flavor or burnt smell may is insulation layer is breakdown or windings have been burned.

Four, touch

The temperature of some parts of the motor can also judge the cause of the malfunction.. To ensure safety, the touch when using hand to touch the motor casing, around the bearing part, if it is found that the temperature anomalies. The reason may have the following kinds.

1 ventilation. Such as fan shedding, ventilation duct blockage, etc..

2 overload. Cause excessive current and stator winding overheat.

3 stator winding inter turn short circuit or three-phase current imbalance.

4 frequent starting or braking.

5 if the bearing temperature is too high, it may be bearing damage or lack of oil caused by.
Fault analysis and troubleshooting of three phase asynchronous motor
Three-phase asynchronous motors are used in a wide range of applications, but after long-term operation, fault, timely judge fault reason, appropriate treatment is to prevent the expansion of the fault, to ensure normal operation of the equipment is an important work.
One, after the electric motor can not turn, but no sound, no smell and smoke.

1. The cause of the fault power did not pass (at least two phases did not pass); (2) fuse (at least two phase fuse); (3) over current relay adjustment is too small; the fourth controls equipment wiring errors.

2. Troubleshooting 1. Check the power supply circuit switch, fuse, the terminal box whether there is a breakpoint, repair; (2) check the fuse type and causes of fuse for new fuse; third, regulating relay setting value and motor coordination; (4) correct wiring.
The motor does not turn two, electricity, then fuse

1. The fault reason lack of power, or the dry coil is reversely connected; II stator winding phase to phase short circuit; 3 stator winding grounding; 4 stator winding connection error; the fuse section is too small; power line short circuit or grounded.

2. Troubleshooting check knife switch, whether there is a phase is not good, power supply circuit, a phase disconnection; eliminate reverse fault; II found fault, to be repaired;
(3) to eliminate the ground;
(4) to detect false answer, be corrected; the replacement of fuse;
(3) to eliminate ground point.
Three, power after the motor does not turn buzzing

L. fault reason, rotor winding circuit breaking phase) or the power phase loss of power; II winding lead wire end and beginning wrong connection or internal winding is connected with the reverse; (3) power supply circuit of loose contact, contact resistance;