Ukukhuphuka kwezinga lokushisa kuyinkomba yokusebenza ebaluleke kakhulu yenjini.Uma ukusebenza kokukhuphuka kwezinga lokushisa kungalungile, impilo yesevisi nokuthembeka kokusebenza kwemoto kuzoncishiswa kakhulu.Izinto ezithinta ukukhuphuka kwezinga lokushisa kwemoto, ngaphezu kokukhethwa kwemingcele yokuklama yemoto ngokwayo, izici eziningi zenqubo yokukhiqiza zizobangela ukukhuphuka kwezinga lokushisa kwemoto ukuthi kungahlangabezani nezidingo zokusebenza okuphephile kwemoto.

Ukuhlola ukukhuphuka kwezinga lokushisa kwemoto, kuyadingeka ukwenza ukuhlolwa kokushisa kokuqina okushisayo kwemoto, futhi akunakwenzeka ukuthola inkinga yokukhuphuka kwezinga lokushisa kwemoto ngokuhlolwa kwefekthri okulula.Inombolo enkulu yokuhlolwa kwangempela kokushisa okuzinzile kokushisa okushisayo kwamamotho kukhombisa ukuthi: ukukhethwa okungalungile kwabalandeli kanye nezingxenye ezishisayo ezingafaneleki kunomthelela omkhulu ekukhuphukeni kwezinga lokushisa, kodwa inkinga yokukhuphuka kwezinga lokushisa okubangelwa izici zokucwilisa nayo ivame ukuhlangana nayo, kanye nekhambi elijwayelekile. iwukucwilisa kabusha upende kanye.

Ukuze kuthuthukiswe ukusebenza kahle kokukhiqiza, iningi lamamotho amancane naphakathi nendawo awanawo upende wokucwilisa oyisisekelo.Ngaphezu kwekhwalithi yokucwilisa kanye nokomisa kwe-winding ngokwayo, ukucinana kwengqikithi yensimbi kanye nohlaka nakho kuthinta ngokuqondile ukuphakama kokugcina kokushisa kwenjini.Ngokwethiyori, indawo yokukhwelana yesisekelo somshini kanye nengqikithi yensimbi kufanele ifaniswe eduze, kodwa ngenxa yokuguquguquka kwesisekelo somshini kanye nensimbi, njll., kuzovela igebe lomoya phakathi kwezindawo ezimbili zokukhwelana ngokuzenzakalelayo, ezingekho. kusiza injini.Ukushisa okushisayo kokukhipha ukushisa.Ukusetshenziswa kopende wokucwilisa ngefreyimu akugcini nje ngokugcwalisa igebe lomoya phakathi kwezindawo zokukhwelana, kodwa futhi kugwema izici ezingenzeka ezingase zilimaze i-motor winding ngesikhathi senqubo yokukhiqiza ngenxa yokuvikelwa kwe-casing.Ukulawula ukuphakamisa kunomphumela othile wokuthuthukisa.

Ukwenziwa kokushisa kubizwa ngokuthi yi-heat conduction.Inqubo yokudlulisa ukushisa phakathi kwezinto ezimbili ezixhumene enye nenye futhi enamazinga okushisa ahlukene, noma phakathi kwezingxenye zokushisa ezihlukene zento efanayo ngaphandle kokususwa okuhlobene kwe-macroscopic, kubizwa ngokuthi ukuqhutshwa kokushisa.Impahla yento ehambisa ukushisa ibizwa ngokuthi i-thermal conductivity yento.Ukudluliswa kokushisa kokuqinile okuminyene nasoketshezini olunganyakazi kuwukuqhutshwa kwe-thermal kuphela.Ingxenye ye-thermal conductive ibandakanyeka ekudlulisweni kokushisa oketshezini olunyakazayo.

I-Thermal conduction incike ekunyakazeni okushisayo kwama-electron, ama-athomu, ama-molecule nama-lattice ezintweni zokudlulisa ukushisa.Kodwa-ke, izakhiwo zezinto ezibonakalayo zihlukile, izindlela eziyinhloko zokushisa ezishisayo zihlukile, futhi imiphumela nayo ihlukile.Ngokuvamile, i-thermal conductivity yensimbi inkulu kune-non-metals, futhi conductivity eshisayo yezinsimbi ezihlanzekile inkulu kunaleyo yama-alloys.Phakathi kwezimo ezintathu zodaba, ukuqhutshwa kwe-thermal yesimo esiqinile sikhulu, kulandelwa isimo se-liquid kanye nesincane kakhulu esimweni segesi.

Ukushisa okushisayo noma izinto zokushisa ezishisayo zivame ukusetshenziswa ekwakhiweni, amandla okushisa, ubuchwepheshe be-cryogenic.Iningi lazo liyizinto ezinama-porous, futhi umoya onokuhamba kahle okushisayo ugcinwa kuma-pores, ukuze bakwazi ukudlala indima yokushisa ukushisa nokugcina ukushisa.Futhi zonke zingama-discontinuities, futhi ukudlulisa ukushisa kunakho kokubili ukushisa kohlaka lwamathambo aqinile nomoya, kanye ne-air convection ngisho nemisebe.Kubunjiniyela, i-thermal conductivity eguqulwa yilokhu kudlulisa ukushisa okuyinhlanganisela kubizwa ngokuthi i-apparent thermal conductivity.I-conductivity ye-thermal ebonakalayo ayithinteki nje kuphela ngokubunjwa kwezinto ezibonakalayo, ingcindezi kanye nezinga lokushisa, kodwa futhi nokushuba kwezinto ezibonakalayo kanye nomswakama.I-density ephansi, i-voids encane kakhulu ezintweni futhi iyancipha ukuqhutshwa kokushisa okubonakalayo.Kodwa-ke, lapho ukuminyana kukuncane ngokwezinga elithile, kusho ukuthi i-voids yangaphakathi inyukile noma ixhunywe enye nenye, okubangela ukuguquguquka komoya kwangaphakathi, ukuthuthukiswa kokudluliswa kokushisa, kanye nokukhuphuka kokusebenza kwe-thermal.Ngakolunye uhlangothi, ama-pores ku-thermal insulation material kulula ukumunca amanzi, futhi ukuhwamuka nokufuduka kwamanzi ngaphansi kwesenzo sokushisa kwe-gradient kukhulisa kakhulu ukuqhutshwa kokushisa okubonakalayo.