Kusanthula kwa kukana kwa motor winding: ndi zingati zomwe zimaganiziridwa kuti ndizoyenera?
Kodi kukana kwa mafunde a stator a motor-gawo atatu asynchronous motor kuyenera kuganiziridwa kuti ndizabwinobwino bwanji kutengera mphamvu?(Ponena za kugwiritsa ntchito mlatho ndikuwerengera kukana kutengera kukula kwa waya, ndizosatheka.) Kwa ma mota omwe ali pansi pa 10KW, ma multimeter amangoyesa ma ohm ochepa.Kwa 55KW, multimeter ikuwonetsa magawo khumi.Musanyalanyaze mayendedwe a inductive pakadali pano.Kwa injini yolumikizidwa ndi nyenyezi ya 3kw, ma multimeter amayesa kukana kwa mafunde a gawo lililonse kukhala pafupifupi 5 ohms (malinga ndi nameplate yamoto, yapano: 5.5A. Power factor = 0.8. Itha kuwerengedwa kuti Z=40 ohms, R = 32 ohm).Kusiyana pakati pa ziwirizi ndikwambiri.Kuyambira pakuyamba kwa injini mpaka koyambirira kwa ntchito yodzaza katundu, mota imayenda kwakanthawi kochepa ndipo kutentha sikokwera.Pambuyo pothamanga kwa ola la 1, kutentha kumakwera mwachibadwa Kufikira pamlingo wina, kodi mphamvu ya galimoto idzatsika kwambiri patatha ola limodzi?Zikuoneka kuti ayi!Apa, ndikhulupilira abwenzi odziwa zamagetsi akhoza kudziwitsa momwe mumayezera.Anzanu omwe amasokonekera pokonza ma motors atha kugawana nawo momwe mukumvera?Onjezani chithunzi kuti muwone:Kukaniza kwa mafunde a magawo atatu a injini kumayesedwa motere:1. Masulani chingwe cholumikizira pakati pa ma terminals agalimoto.2. Gwiritsani ntchito njira yochepetsetsa ya multimeter ya digito kuti muyese kukana kumayambiriro ndi kumapeto kwa mapiritsi atatu a injini.Nthawi zambiri, kukana kwa ma windings atatu kuyenera kukhala kofanana.Ngati pali cholakwika, cholakwikacho sichingakhale chachikulu kuposa 5%.3. Ngati kukana kwa ma motor winding kuli kwakukulu kuposa 1 ohm, kungayesedwe ndi mlatho wa mkono umodzi.Ngati kukana kokhotakhota kwa injini kuli kochepera 1 ohm, kumatha kuyeza ndi mlatho wokhala ndi manja awiri.Ngati pali kusiyana kwakukulu pakati pa ma windings a galimoto, zikutanthauza kuti ma windings a galimoto amakhala ndi maulendo afupikitsa, mabwalo otseguka, kuwotcherera kosauka ndi zolakwika pa chiwerengero cha makhoti okhotakhota.4. Kukaniza kutchinjiriza pakati pa ma windings ndi kukana kwa insulation pakati pa ma windings ndi zipolopolo zitha kuyezedwa ndi:1) Galimoto ya 380V imayesedwa ndi megohmmeter yokhala ndi miyeso ya 0-500 megohms kapena 0-1000 megohms.Kukaniza kwake kwa insulation sikungakhale kuchepera 0,5 megohms.2) Gwiritsani ntchito megohmmeter yokhala ndi miyeso yoyambira 0-2000 megohms kuyeza mota yothamanga kwambiri.Kukana kwake kwa insulation sikungakhale kutsika kuposa 10-20 megohms.