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.
Think it is necessary to project still explosion-proof test unit by explosion-proof inspection unit.After repair,explosion-proof motor should be to use the department to provide the following documents: 1) fault inspection;2) repair work instructions;3) Motor vehicle replacement and repair parts catalog;4) inspection and test results;5) repair certificate.Eight,are not allowed to repair the piano pieces 1) by the size of glass,plastic or other unstable parts made of materials;2) fasteners;3) the manufacturer or explosion-proof code that can't repair parts,such as encapsulation component.A sign of nine,after the repair will not affect the explosion-proof performance of repair,after repair without repair.Ten,the flame-proof certification after after repair motor repair the repair unit inspection department shall issue certificate of approval.Described above shall include at least by repairing the name,type,specification,water pump explosion-proof motor logo,the name of the class units and its approval certificate number,explosion-proof certificate number,date of repair,etc.The standard code for GB3836.13-1997 after the repair.Signs must be norm,durable,and resistant to chemical corrosion.Signs should be metal materials,commonly permanently fixed on the motor after the repair,repair again,after repair,the previous repair sign shall be removed.
