The breakdown processing technique with three-phase asynchronous the commonnest electric machinery

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Alien stage electric machinery is the electric equipment with manufacturing most wide application, its action is an electric energy changeover is mechanical energy, the electric energy that the electromotor in the enterprise wastes occupies the 60% above that specific power consumption measures, what use at most among them is electromotor of asynchronous of squirrel cage form, its structure is simple, start convenient, bulk lesser, job is reliable hard usage, facilitate safeguard and overhaul. Asynchronous electromotor trouble is more, can divide commonly for electric with machinery two parts. Electric part breakdown has stator winding to be short of move, stator winding from beginning to end is received instead, overheat of short circuit of lopsided, winding and ground connection, winding and rotor break three-phase electric current, open circuit; Mechanical part breakdown has rotor to sweep overheat of chamber, oscillatory, bearing, attaint to wait. Move to assure the safety of asynchronous electromotor, after electromotor malfunctions, must rapid and accurate make a thorough investigation of the reason of breakdown happening, so that as soon as possible rehabilitate. A few kinds of of three-phase asynchronous electromotor common breakdown reach a processing technique: One, bad experience indicates strength of electromotor stator compression, the main reason with undesirable intensity of compression of electric machinery stator, much because the blemish of winding insulation respect, be like: Bring burst of wiring insulated sleeve, winding to carry a ministry to touch the reason such as be affected with damp be affected with damp of ageing of damaged of insulation of injury, alternate with, electromotor to cause winding to be isolated from by puncture, electromotor of burn down of as a result. 2, electromotor sky carries electric current to slant big electromotor carries electric current and design to guide magnetism material and the element such as production level are concerned for nothing, still mix with the power of electromotor extremely number is concerned. Usually, electromotor sky holds electric current and the scale concern with be fully loaded with electric current to having particular, power is little, extremely several much, sky carry electric current and be fully loaded with voltaic ratio big, sky of electric machinery of series of commonly used Y carries cent plant electric current and the ratio that are fully loaded with electric current (%) . To new motor or the electromotor after changing winding, need a test to carry electricity for nothing, if be measured so that electromotor sky carries electric current to exceed normal range, indicate electromotor existence problem, need to make a thorough investigation of so that the reason undertakes handling, watch 2 listed asynchronous electromotor carries electric current to slant for nothing big reason and processing technique. 3, electromotor three-phase electric current is lopsided when three-phase power source is symmetrical, asynchronous electromotor carries electricity in sky of three-phase of rated report depressive, 10% what the deviation of average of any one get along with must not be more than average, be in only three-phase voltage is lopsided too big or electromotor itself had trouble, electromotor just can generate bigger three phase current lopsided. Three-phase electric current is lopsided divide outside making electromotor generation additional and calorific, still can cause three-phase to rotate magnetic field is lopsided, make electromotor gives out special grave sound, airframe also because of this vibration. Express 3 for electric current of asynchronous electromotor three-phase lopsided case study. 4, electromotor temperature is tall when electromotor below rated job state, when moving normally, its temperature should not exceed temperature to be restricted to be worth. The cause that causes electromotor overheat is very complex, the unusual situation of itself of power source, electromotor and laden tripartite face can cause electromotor overheat, ventilated medicinal powder heat is undesirable also can cause electromotor overheat, attached drawing lists bring about correlation of electromotor overheat cause and effect to pursue. Electromotor is long-term overheat, can make electromotor is isolated from be heated ageing, affect electromotor service life, to the electromotor of in use, if temperature rise is fast, should stop machine the reoccupy after finding out a reason to remove trouble. 5, when the vibration of electromotor and noise electromotor are moving normally, airframe should be smooth, voice should be small and even, the vibration of electromotor should distinguish first is electromotor itself still gearing installs bad place to cause those who cause, mechanical perhaps and laden end is delivered come over, undertake eliminating in the light of particular case next. Belong to the vibration that electromotor itself causes, producing actual in, majority is as a result of dynamic balancing undesirable, runner shaft curves bad, bearing or electromotor assembly ground is rough, fastener shakes those who wait for a reason to cause. Oscillatory meeting produces noise, still can generate additional negative charge. If sound is abnormal, the likelihood has undermentioned a few kinds of circumstances: 1, when giving out bigger buzz, explain electric current is too big, the likelihood is excess load or three-phase electric current lopsided cause, when electromotor single-phase when moving, buzz will be bigger. 2, when giving out murmur murmur noise, the likelihood is be caused by of bearing ball attaint. 3, give out touch inhomogenously when brushing sound, because rotor and stator photograph brush the sound that give out to sweep chamber sound namely,often be, answer to stop machine processing instantly. 6, the circle inside the rotor when electromotor sweeps chamber electromotor to turn and stator is touched brush, call electromotor to sweep chamber. When electromotor sweeps chamber, the circle inside the surface outside rotor and stator can appear scrape, explain clearance of rotor, stator is inhomogenous at this moment. Sweep chamber badly to be able to make the circle inside stator local generation high temperature, the insulation of groovy surface becomes anxious below high temperature fragile, cause winding ground connection or short circuit, still can cause electric machinery vibration and noise, make electric machinery function drops. The reason that causes electromotor to sweep chamber is very much, and interweave each other. 7, electromotor bearing overheat is in small-sized electromotor, general before, back end all uses ball bearing, in medium-sized electromotor, average transmission end uses roller bearing, another end uses ball bearing, also have use sliding bearing structure. Bearing gives out heat is the breakdown with asynchronous the commonnest electromotor, bearing is calorific, make lube gently attenuant leakage, damage bearing again. 8, be short of in moving in routine, be short of moving is one of common breakdown, there should be one photograph to open circuit to be able to cause electromotor be short of only in three-phase power source move. Be short of as a result of,run a likelihood fusing of fuse-element of the fuse on circuit, switch contact or lead connect contact are undesirable wait for a reason to cause. After three-phase electromotor lacks one bearing power supply, be like suspending status, because synthetic torsion is 0 consequently locked-rotor (cannot start) . The locked-rotor electric current of electromotor is a lot of bigger than the electric current of regular job, because this is below this kind of circumstance, receive electrify source to time grows too or receive electrify source often to start for many times will bring about electromotor burn down. When the electromotor in moving is short of one photograph, if laden torsion is very small, return tenability movement, only rotate speed drops somewhat, give out unusual noise, when load is heavy, run time is too long, will make electromotor winding burn down. CNC Milling CNC Machining