We may encounter in the use of relevantThree-phase asynchronous motorThe cause of vibration besidesThe voltage imbalance of three-phase power supply is largeOr maybe it is The stator winding of the motor has serious short-circuit fault between turns. The following is a small series of Senli motor about the causes of three-phase asynchronous motor vibration, of course, the specific situation also needs specific analysis,Follow Senli motor Xiaobian take a look at it.
In addition to the above reasons, there are the following:
1.The bearing quality does not meet the requirements, or there is a problem with the bearing assembly, resulting in the coaxial degree of the bearing and the bearing chamber does not meet the requirements.
2.Due to machining reasons, the coaxiality between the bearing chamber and the seat stop does not meet the requirements, or the coaxiality between the rotating shaft bearing stop and the outer circle of the rotor core does not meet the requirements.
3.The natural vibration frequency of the whole mechanical structure of the three-phase asynchronous motor coincides with the vibration frequency generated by energized operation, resulting in the resonance of the whole machine running.
4.The diameter of the bearing chamber is too large or too small, or there is a large taper.
5.The bearing on the active end is incorrect in the axial position or "stuck" due to the bearing cover opening higher than the design value, or the depth of the bearing chamber is not consistent, or the distance of the shaft bearing stop is too large or small.
6.The waveform spring placed is more or less, or the elasticity is too large or too small, so that the bearing at the active end can not move or the amount of activity is too large.
7.The unbalance of the rotor exceeds the allowable value or the "horseshoe" phenomenon of the iron core is more serious.
8.The air gap of stator and rotor is not uniform.
9.The stator and rotor cores are not aligned axially.
10.The rotor core is detached from the shaft. At this time, a large abnormal sound will be issued, and the speed is low.
11.The rotor guide bar has serious thin or broken bars.
12.For the winding rotor three-phase asynchronous motor, the rotor winding has a phase break or near phase break fault (the reason may be: the brush does not contact the collector ring or the line is broken; The rotor lead line is disconnected; The coupling cap at the end of the rotor winding falls off; The conductor rod of the collector ring is poorly connected to the slip ring, etc.). The fault cause is determined by measuring the DC resistance of the rotor circuit.
13.For the winding rotor motor, the rotor winding has serious interturn or interphase short circuit fault. The fault cause is determined by measuring the DC resistance of the rotor circuit.
14.The action of foreign bodies causes the rotor rotation to be blocked.
15.The fan or other moving parts are improperly installed or loose. The fan or other moving parts rub with fixed parts, such as the end cover or fan cover.
16.The fan is unbalanced or has a large bias.
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