Ammeter pointer during no-load or load running back and forth

1),2) squirrel cage rotor broken bar,a phase winding rotor circuit (3),a phase of wound rotor type motor brush contact bad 4),wound rotor type motor Poor contact slip ring wholesalemotor.blogspot.com short circuit devices 9.The cause of motor vibration 1),2) unbalanced rotor,shaft bending head 3) 4),imbalance of pulley,pulley eccentric shaft hole 5),fixed the loose bolts 6) of the motor,fixed The acmotortrading.blogspot.com foundation of the motor not firm or uneven 10.The cause of the motor bearing perkins diesel generator set overheating 1),2) bearing damage,lubricating oil too much,too little,or oily bad with 3),bearing and perkins diesel generator set shaft too loose walk in circle or too close with 4),bearing and end cover too loose walk outside Or too close.5),sliding bearing ring rolling or slow rotation 6),on both sides of motor end cover or bearing cover is not flat 7),belt tight 8),coupling packed Not good.

The main points of the motor maintenance inspection

Motor maintenance inspection is the main points of the early found abnormal state of equipment and handled in time,prevent accident expanding.Maintenance personnel according to the action of relay protection device and the signal can be found abnormal phenomenon,also can rely on the experience of the maintenance staff to diagnose accident.1,the first is a visual inspection Visual can be found on the acmotortrading.blogspot.com following anomalies: if there's any loose for motor

external fasteners,parts whether have damage,equipment surface whether there is oil

pollution,corrosion phenomena;The contact point and connection of the motor have become angry

phenomenon such as mark,burn mark and smoke.Causes for this phenomenon is due to the local

overheating or poor conductor or motor winding burned down,etc.;The instrument is normal.Voltmeter

without instructions or is not normal,suggests that gear motor the power supply

voltage imbalance,fuse,rotor resistance unbalanced three-phase,single phase operation,and poor

conductor,etc.Ammeter indication is too big,suggests that motor overload,bearing fault,winding

interturn short circuit,etc.

Motor stalling,caused by the reasons are: the power blackouts,single phase operation,low voltage,torque of the motor is too small,heavy load,the voltage drop is too large,bearing burning,mechanical jam,etc.2,USES the auscultation rods by ear can hear the motor all

kinds of noise Including electromagnetic noise,ventilation,noise,mechanical friction,bearing noise and so on,which can judge the motor of the cause of the problem.The cause of large noise has: in mechanical bearing fault,mechanical imbalance,fastening screw loosening,diesel generators pricesshaft coupling phase does not conform to requirements,stator core brush,etc.;Have: electric voltage imbalance,single phase operation,winding circuit or breakdown failure,starting performance is bad,bad acceleration,etc.3,by the sense of smell can be found burnt taste,smell The causes of this phenomenon is: motor overheating,winding burned,single phase operation,winding fault,bearings,etc.electricalmotor1.blogspot.com 4,by touch with the hand to touch the surface of the casing can be found that the temperature of the motor and vibration phenomenon The cause of vibration is: mechanical load imbalance,fastening components have loose phenomenon,improper motor base strength is not enough,shaft coupling and uneven air gap or mixed with perkins diesel generator setsundry,voltage imbalance,single phase operation,winding fault,bearings,etc.

Is the cause of the motor temperature too high overload,cooling air duct blockage,single phase operation,turn-to-turn short circuit,voltage too high or too low,unbalanced three-phase voltage,speed characteristics not make starting time is too long,stator and rotor phase wipe,starter poor contact,frequent starting and braking,reverse connect braking or imported high wind temperature,mechanical jam,etc.With the hand touch the estimate motor surface temperature,due to the feeling of everybody is different,subjective,so should be determined by experience.Routine

maintenance inspection is divided into daily check,monthly or regular Tours of inspection and check

every year.In daily inspection,mainly check the lubrication system,appearance,temperature,noise,vibration and abnormal phenomenon,also check ventilation cooling system,the start capacitor condition of sliding friction and fastening situation of

parts,do check and record.Monthly or regular inspection of the main check grounding device

switch,wiring,whether there is loose phenomenon,such as presence of damaged parts,if you have to plan and repair measures are put forward,check the dust accumulation,to timely cleaning,check for damage and aging lead wire and the wiring problem.Testing the motor winding insulation resistance and record.Annual check content in addition to the above project,and the collapse of the motor pumping heart checks,cleaning or washing oil dirties,check the insulation.