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Air compressor motor protection and the cause of damage
Author: 志和      Release Date:2014/10/11      View Count:4723
 

Air compressor motor protection and the cause of damage

Compressor is a kind of mechanical equipment in general, are widely used in industrial and agricultural production in the field. But as the motor of air compressor power equipment (i.e.: three-phase asynchronous motor), the faultdamage rate generally higher than other equipment in motor. This is why? This paper presents the damage reason about air compressor motor and how toprotect the motor and other issues of the basic concepts, the hope can causeair compressor manufacturing industry and the broad masses of customer concerns, participated in the discussion. If there is any problem, pleaseamend:

Analysis of damage causes of air compressor motor:

The reason of compressor motor damage empty is comprehensive. The reason ofcompressor motor damage in addition to conventional air with common faultfactors and motor power equipment of other external factors, the faultgenerated specific operation but also with the air compressor itself about.

The reason of compressor motor damage empty inductive analysis mainly include the several:

1, heavy load shutdown

Air compressor shutdown, and various other equipment, are in the reach set upper limit of maximum pressure will stop. AC contactor segment movement inunder heavy load, large current. This arc spark is most serious, pose a great threat to the AC contactor damage due to AC contactor, damaged, will cause the character of power supply failure. Such as imbalance (phase) operation.

2, automatic exhaust valve failure

Air compressor is generally no automatic exhaust device, when the pressure reaches the set pressure, stop automatically after the exhaust depressurization, preset next no-load starting, exhaust valve failure, air compressor cylinder pressure cannot be released, is equal to the motor start with load, may cause difficulty in starting or locked rotor fault.

3, the automatic pressure switch reliability and sensitivity

Air compressor start stop usually consists of a pneumatic automatic switch(pressure relay) is directly driven by a motor to realize the automatic control of AC contactor. Most of the mechanical and pneumatic automaticswitch type structure, compression and release energy by operating contactspring. Perhaps a pneumatic automatic switch be congenitally deficient oraffected by regulating improper, machine shock and other different reasons.In the control of pressure in the process, often there may be two kinds of abnormal movements phenomenon: the first kind is refused action pressure automatic switch over pressure, so that the motor can not operate normally,pressure continues to rise, leading to motor overload overload operation,serious when may malfunction blocking phenomenon. The second is the automaticswitching transient shock pressure jump phenomena (especially the pressureclose to the upper or lower limit of the critical state), at the same timethe AC contactor to produce synchronous shock jump. Cause of AC contactormain contact in the frequent starting current impact of the burned out orstuck by stopping or running phase faults.

4, frequent starting

Because of irregular peripheral gas consumption, gas consumption large,forcing the motor frequent starting work. Thermal residual produce largestarting current of accumulation is not easy to diffuse, the motortemperature, which is likely to cause the motor to be burned.

Suddenly 5, running off of electricity

Air compressor automatic control, if encounter sudden stop transmission case,because the air compressor cylinder pressure time to release and re - start.In heavy load starting of motor, is likely to form a blockage fault.

6, its mechanical properties of air compressor fault

The air compressor is uneven load properties, vibration noise, transmissionparts wear failure caused by obstruction of mechanical damage, extremely easy to cause the motor overload (stall, occlusion etc.).

The current situation of the protection of 7, air compressor motor

Show that the several typical fault factors, air compressor motor is correct,reasonable protection is very urgent and necessary. But, so far, protection device for air compressor motor continues to heat relay mainly. Of course,the thermal relay protection products as a traditional, it has the advantages of simple structure, convenient use, low price, has a certain inverse time characteristic advantages, but its working principle, performance characteristics determine its function of small, large power consumption, low precision, setting rough, easily affected by environment, poor reproducibility, error some deficiencies and defects. For blocking, long-termoverload fault motor starting process, can achieve reliable protection,therefore can not meet the actual requirements for protection of air compressor. Therefore, the protection of failure is an undeniable fact that.With the development of society, advances in technology, behind the productsto be facing elimination, thermal relay has completed its historical mission.

Working conditions 8, air compressor

Mechanical operation of the air compressor, the electric control is relatively simple (especially small power type), are generally single groupwork independently, in the non professional operation occasions, if not timely processing of faults, then the fault of the repeat expansion rate will be increased.

Special protection starter air compressor (what is to protect the starter of air compressor):

Electronic motor protection device of new generation is a product of advancedelectronic technology era, it has incomparable thermal relay, also cannot realize the function characteristic. Protect the starter (hereinafter referred to as the starter), is a special needs protection against air compressor and developed a new generation of electronic motor protection products derived series products. The protection of air compressor motorprotection effectiveness is more scientific, more reasonable, more correct.It solves the problem of air compressor in the use of the process for pushing the switch element pressure automatic switch of bad contact of the elastic element, the free end of the shift is not correct and air pressure automaticswitch operating frequently, so that the continuity of seismic moment jump AC contactor, heat can not be distributed, resulting in an alternating current contactor main contact burn or contact adhesion, cause the defect of motorphase or flow operation, from

 
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