Ukukhuselwa kobushushu beMoto kunye nokulinganisa ubushushu

Ukusetyenziswa kwe-PTC Thermistor

 

2. Ukukhuselwa kokugqithiswa kwe-PTC thermistor

I-PTC thermistor yokhuseleko lomthwalo ogqithisiweyo yinto ekhusela ngokuzenzekelayo kwaye iphinde ibuyele kubushushu obungaqhelekanga kunye nomsinga ongaqhelekanga, owaziwa ngokuba yi-"resettable fuse" kunye "nefuse yamawaka alishumi". Ithatha indawo iifusi zemveli kwaye ingasetyenziswa ngokubanzi ukhuseleko overcurrent kunye overheating of motors, transformers, switching power supply, electronic circuits, etc. PTC thermistors for overload protection limit limit the consumption in the line yonke ngesiquphe utshintsho lwexabiso ukumelana ukunciphisa ixabiso langoku elishiyekileyo.

I-fuse yendabuko ayikwazi ukubuyisela ngokwayo emva kokuba umgca uvuthelwe, kwaye i-thermistor ye-PTC yokukhusela i-overload inokubuyiselwa kwimeko yokukhusela kwangaphambili emva kokuba iphoso lisusiwe, kwaye umsebenzi walo wokukhusela ukugqithisa kunye nokufudumala kunokuphunyezwa xa iphutha liphinda livela. .Khetha i-PTC thermistor yokhuseleko lomthwalo ogqithisiweyo njengento yokukhusela i-thermal. Okokuqala, qinisekisa ubuninzi bexesha eliqhelekileyo elisebenzayo lomgca (oko kukuthi, i-non-operating current ye-PTC thermistor yokukhusela ukulayisha ngaphezulu) kunye nendawo yokufakela i-PTC thermistor yokukhusela ubuninzi (ngexesha lomsebenzi oqhelekileyo). ) Elona qondo lobushushu liphezulu le-ambiente, lilandelwa lukhuselo lwangoku (oko kukuthi, ukusebenza ngoku kwe-PTC thermistor yokukhusela umthwalo ogqithileyo), owona mbane uphezulu wokusebenza, umlinganiselo wokuchasana nombane ongu-0, kunye nezinto ezifana nobukhulu bamacandelo kufuneka nazo. kuthathelwe ingqalelo.

Umgaqo wokusetyenziswa

Xa isiphaluka sikwimeko eqhelekileyo, ngoku udlula kwi-thermistor ye-PTC yokukhusela umthwalo ogqithisiweyo ungaphantsi kwe-rerated yangoku, kunye ne-PTC thermistor yokukhusela ukugqithiswa kwimeko eqhelekileyo, kunye nexabiso elincinci lokumelana, elingayi kuchaphazela ukusebenza okuqhelekileyo kwesekethe ekhuselweyo.

Xa isiphaluka sihluleka kwaye i-current idlula kakhulu i-current rated current, i-thermistor ye-PTC yokukhusela ukugqithisa ngokukhawuleza iyatshisa kwaye ikwimeko ephezulu yokumelana, yenza isiphaluka kwindawo "ecinyiweyo", ngaloo ndlela ikhusela isiphaluka kumonakalo.Xa impazamo isusiwe, i-thermistor ye-PTC yokukhusela umthwalo ogqithisiweyo iphinda ibuyele ngokuzenzekelayo kwimeko ephantsi yokumelana, kwaye isiphaluka siqala ukusebenza ngokuqhelekileyo.

3. Ukhuseleko lobushushu obugqithisileyo lwe-PTC thermistor

Iqondo lobushushu leCurie lePTC thermistor sensor lisuka kuma-40 ukuya kuma-300°C. Kwi-RT ye-curve yeempawu ze-PTC thermistor sensor, ukunyuka okunyukayo kwexabiso lokumelana emva kokungena kwindawo yenguqu kunokusetyenziswa njengeqondo lokushisa, inqanaba lolwelo, kunye nemvakalelo yokugeleza. isicelo. Ngokutsho kweempawu ze-PTC ze-thermistors ze-PTC, ziyilelwe ukuba zisetyenziswe ekukhuseleni ubushushu kunye nezihlandlo zokubona ubushushu, kwaye zisetyenziselwa ukutshintsha izixhobo zombane, izixhobo zombane (iimoto, i-transistors), izixhobo zamandla (i-transistors). Ibonakaliswa ngobukhulu obuncinci kunye nexesha lokuphendula ngokukhawuleza. , Kulula ukuyifaka.

Umahluko phakathi kwe-PTC kunye ne-KTY:I-Siemens isebenzisa i-KTY

Okokuqala, luhlobo lwesixhobo sokukhusela ubushushu bemoto;

I-PTC yinkcaso kunye ne-coefficient yokushisa efanelekileyo, oko kukuthi, ixabiso lokumelana landa njengoko ukushisa kuphakama;

Enye kukuba i-NTC yi-resistor eguquguqukayo ene-coefficient yeqondo lokushisa elibi, kwaye ixabiso lokumelana liyancipha njengoko ubushushu bukhuphuka, kwaye alusetyenziselwa ukhuseleko lwemoto jikelele.I-KTY inokuchaneka okuphezulu, ukuthembeka okuphezulu kunye nokuzinza okuqinileyo.Isetyenziswa kakhulu kwintsimi yokulinganisa ubushushu.I-KTY igutyungelwe ngoluhlu lwe-silicon dioxide insulating material, umngxuma wetsimbi onobubanzi be-20mm uvulwa kwi-insulating layer, kwaye yonke i-layer ephantsi ifakwe ngokupheleleyo.Ulwabiwo lwangoku oluxutywe ukusuka phezulu ukuya ngasezantsi lufunyenwe ngokucwangciswa kweekristale, ngoko kuthiwa yi-diffusion resistance.I-KTY inomlinganiselo wobushushu osebenzayo ongaphakathi kumgca womlinganiso wobushushu phezu kwalo lonke uluhlu lomlinganiselo wobushushu, ngaloo ndlela iqinisekisa ukuchaneka komlinganiselo wobushushu obuphezulu.

I-PT100 yeplatinam yokumelana ne-thermal yenzelwe kwaye yenziwe ngokusebenzisa umgaqo osisiseko wokuba ixabiso lokuchasana le-platinam litshintsha ngokutshintsha kweqondo lokushisa. ) kunye ne-100 ohms (inombolo yokuphumelela i-Pt100), njl., uluhlu lokulinganisa ubushushu ngu-200~850 ℃. Into yokuva iqondo lobushushu le-10 ohm yeplatinam yokumelana ne-thermal yenziwe ngocingo olungqingqwa lweplatinam, kwaye ukusebenza kokumelana nobushushu kuyacaca ukuba kuhle kakhulu. I-100 ohm ukumelana nobushushu beplatinam, okoko nje isetyenziswa kwindawo yobushushu ngaphezulu kwama-650 ℃: 100 ohm ukumelana nobushushu beplatinam isetyenziswa ikakhulu kwindawo yobushushu obungaphantsi kwama-650 ℃, nangona ingasetyenziswa kwindawo yobushushu ngaphezulu kwe-650 ℃, kodwa kwindawo yobushushu obungaphezulu kwama-650 ℃ iimpazamo zodidi A azivumelekanga. Isisombululo se-100 ohm i-platinum ukumelana ne-thermal ngamaxesha angama-10 amakhulu kune-10 ohm i-platinum ukumelana ne-thermal, kwaye iimfuno zezixhobo zesibini zihambelana nomyalelo wobukhulu. Ngoko ke, i-100 ohm i-platinum ukumelana ne-thermal kufuneka isetyenziswe kangangoko kunokwenzeka ukulinganisa ubushushu kwindawo yobushushu obungaphantsi kwe-650 °C.