AC motor is moving in wait for a reason as a result of ageing of attrition, oscillatory, insulation, hard to avoid malfunctions. If these breakdown are seasonable examination, discovery and eliminate, prevent the happening of the accident effectively.
One, the breakdown examination of asynchronous electric machinery
1. Hear voice, look for breakdown hand over item by item carefully to sort asynchronous electric machinery in moving, if discover fine “ buzzs ” sound, not ignore tall change lowly suddenly, it is a kind of normal sound, if voice is husky, and the “ that has acuteness buzzs the foreboding that sound of ” of ” , “ whistle whistle is existence breakdown, should consider the following matter:
(L) core shakes electric machinery the vibration in move, temperature ignore tall change lowly suddenly, can make core secures bolt to be out of shape, cause silicon steel piece become loose, produce big electromagnetism noise.
(The voice that transmit of rotor of 2) rotor noise coming back gives, arise by cooling fan, it is sound of ” of toot of toot of a kind of “ , have resemble striking the tone of ” of “ Dong Dong when beat, this is electric machinery is being started abruptly, stop, receive the gearshift circumstance such as apply the brake to fall instead, quicken pitching moment to make of rotor core and axis cooperate to shake place to cause, light person can continue to use, strip inspection mixes the person that weigh repair.
(Electric machinery of 3) bearing noise is moving in, must notice bearing audio culture, touch the one aspect of the matter of screwdriver on bearing lid, another end is stuck on ear, the voice that can hear electric machinery interior changes, different position, different breakdown, have different voice. Be like sound of ” of “ creak creak, it is the generation of irregular motion place that the gun rolls inside bearing, condition of the clearance of it and bearing, grease is concerned. Sound of ” of “ whistle whistle is metallic attrition sound, be short of oil by bearing commonly at grinding be caused by, should ravel bearing adds grease agent to wait.
2. Use bromine to become aware, in moving normally, analysing breakdown electric machinery do not have peculiar smell, be like nose different be ignorant of, it is fault signal, be like anxious burnt flavour, insulant barbecue is given out, and those who follow electric machinery temperature is elevatory, serious when return meeting fume; Be like oily scorching, it is bearing is short of oil likely, be close to do evaporate of the oil gas when grinding condition to give out showing peculiar smell.
3. Use feel, examination breakdown feels the case of TV with the hand, can judge the discretion of temperature rise roughly, if use a hand to touch electric machinery crust feels very very hot, temperature cost is very high, should examine a reason, be like: Overweight, voltage passes negative charge advanced, remove trouble in the light of the reason next.
Previous12 Next
