Motor common faults

 Common faults of three phase asynchronous motor are swept rotor chamber,vibration,winding turns or short circuit between the layers,winding grounding,stator winding lack of phase operation,the reverse of the stator winding unbalanced three phase current,core silicon steel sheet insulation damage,etc.Motor vibration generated when the noise and the additional load,may be bad driving device,can also be caused by the motor itself,such as the rotor dynamic balance is not good,shaft bending,installation does not reach the designated position,loose fasteners and so on.Motor open phase running the cause of the main line fuse is melt fuse or current setting values are not appropriate,touch switch contacts caused by the bad.If you run a long time,will burn out motor.Three-phase voltage imbalance or winding electric vehicle motor interturn short circuit will cause unbalanced three phase current,the stator winding end reverse connection will cause the motor temperature rise,winding grounding or short circuit can cause too much electricity,iron core silicon steel sheet insulation damage will cause motor overheating,etc.

In a word,in actual operation,to analyze the cause of the problem correctly,strengthen the patrol and maintenance,timely discover and eliminate the malfunction of the motor,as much as possible to ensure safe operation of motor Motor maintenance of motor start,first check the motor assembly is flexible,winding insulation resistance is in line with the requirements,the rotating part for jam,also check the motor start and protection equipment eligibility requirements,such as motor grounding device is in good condition,the selected low voltage circuit breaker,contactor,fuse configuration is correct,and so on.Motor start,start times cannot too much,otherwise the motor could overheat burn out.In the operation of the motor,to closely monitor the voltage,current and temperature,the motor operating electricalmotor1.blogspot.com voltage should be strictly controlled within the scope of the change,otherwise may cause motor overheating,also,the current is not too high or too low,because when the voltage must be,running current drag,it reflects the motor load,mechanical load,motor overload operation for a long time,the current will rise,make serious motor overheating,if the motor load is light,the formation of "big horse car",the motor capacity is not able to make full use of.In daily maintenance,also should closely monitor any abnormal noise or vibration motor,check whether the screw is fall off or loose,the motor repair and maintenance regularly,keep clear of the external dust,oil change on a regular basis.

The selection of the motor selection of motor,first of all to understand the mechanical load characteristics of the motor,according to the types and features of the mechanical load to select the rated capacity,rated speed and rated voltage of the motor and the pattern.For a production machine equipped with an electric motor,the first thing to reasonably choose the power of the motor.Usually according to the need of the production of mechanical load to select the power of the motor,at the same time,consider the work of load problem,that is to say,should be adapted to the selected motor mechanical load of the continuous nature of work,short-term or intermittent cycle.When the power to choose not too big,also not too small.Choose the small,can't guarantee the normal work of the motor and production machinery; Choose the big,motor fan although can guarantee the normal operation,but not the economy,motor capacity can not be make full use of,and motor often cannot full load operation,make the efficiency and power factor is not high.Secondly,according to the request of power supply voltage conditions,chooses Y series three-phase asynchronous motor rated voltage and frequency with the power supply voltage and frequency.The speed of the motor must be selected according to the requirement of the production machinery nameplate,otherwise may change in the production of mechanical performance.In addition,the structure,protection,cooling of the motor and installation form,should adapt to the requirement of using the environment conditions,and to strive for installation,debugging,maintenance is convenient,safe and reliable to ensure the motor can run.