Yuav ua li cas ntsuas qhov zoo ntawm inductance_Yuav ua li cas txiav txim qhov zoo ntawm inductance nrog ib tug multimeter
Ua ntej, lub ntsiab txhais ntawm inductance
Inductance yog qhov piv ntawm cov hlau nplaum sib nqus ntawm cov hlau mus rau qhov tam sim no uas ua rau qhov sib nqus flux no thaum muaj qhov hloov pauv tam sim no dhau los ntawm cov hlau, uas ua rau muaj kev sib nqus sib nqus hauv thiab ib ncig ntawm cov hlau.
Thaum DC tam sim no dhau los ntawm inductor, tsuas muaj cov kab hlau nplaum ruaj khov ntawm lub zog nyob ib puag ncig nws, uas tsis hloov nrog lub sijhawm; Txawm li cas los xij, thaum AC tam sim no dhau los ntawm lub kauj, yuav muaj cov kab sib nqus ntawm lub zog nyob ib puag ncig nws hloov nrog lub sijhawm. Raws li Faraday txoj cai lij choj ntawm Electromagnetic Induction---Magnetic Electricity, hloov magnetic kab ntawm lub zog yuav tsim ib tug induced muaj peev xwm ntawm ob qho tag nrho cov kauj, uas yog sib npaug rau "tshiab fais fab mov". Thaum lub voj kaw raug tsim, qhov kev tsim muaj peev xwm ua rau muaj qhov cuam tshuam tam sim no. Nws yog paub los ntawm Lenz txoj cai hais tias tag nrho cov nyiaj ntawm magnetic teb kab generated los ntawm induced tam sim no yuav tsum tau sim los tiv thaiv qhov kev hloov ntawm tus thawj magnetic teb kab. Txij li thaum thawj qhov sib nqus teb kab hloov pauv los ntawm kev hloov pauv ntawm cov khoom siv hluav taws xob sab nraud, los ntawm cov txiaj ntsig ntawm lub hom phiaj, inductance coil muaj cov yam ntxwv ntawm kev tiv thaiv kev hloov pauv tam sim no hauv kev hloov pauv tam sim no. Lub inductance coil muaj cov yam ntxwv zoo sib xws rau inertia hauv mechanics, thiab muaj npe hu ua "self-induction" hauv hluav taws xob. Feem ntau, sparks yuav tshwm sim nyob rau lub sijhawm thaum lub riam hloov tau qhib lossis lub riam hloov tau qhib. Qhov no yog qhov tshwm sim ntawm tus kheej induction. tshwm sim los ntawm siab induced muaj peev xwm.
Nyob rau hauv luv luv, thaum lub inductance coil txuas nrog AC fais fab mov, cov kab sib nqus ntawm lub zog hauv lub kauj yuav hloov tas li nrog cov hloov tam sim no, ua rau lub kauj txuas txuas ntxiv tsim hluav taws xob induction. Qhov hluav taws xob hluav taws xob no tsim los ntawm kev hloov pauv tam sim no ntawm lub kauj nws tus kheej yog hu ua "self-induced electromotive force". Nws tuaj yeem pom tau tias qhov inductance tsuas yog qhov ntsuas uas cuam tshuam nrog tus lej ntawm qhov tig, qhov loj me, cov duab thiab nruab nrab ntawm lub kauj. Nws yog ib qho kev ntsuas ntawm inertia ntawm inductive coil thiab tsis muaj dab tsi cuam tshuam nrog cov ntaub ntawv tam sim no.
2. Inductance yam ntxwv
Cov yam ntxwv ntawm inductors yog qhov sib txawv ntawm cov capacitor. Lawv muaj cov yam ntxwv ntawm kev tiv thaiv alternating tam sim no los ntawm kev hla thiab tso cai rau cov tam sim no ncaj qha mus rau smoothly. Thaum lub teeb liab DC hla dhau ntawm lub kauj, qhov tsis kam yog qhov tsis kam voltage poob ntawm cov hlau nws tus kheej. Thaum lub teeb liab AC hla dhau ntawm lub kauj, lub zog ntawm tus kheej-induced electromotive yuav raug tsim tawm ntawm ob qho kawg ntawm lub kauj. Cov kev taw qhia ntawm tus kheej-induced electromotive quab yuam yog rov qab rau cov kev taw qhia ntawm cov ntaub ntawv siv voltage, uas cuam tshuam txoj kev ntawm AC. , yog li cov yam ntxwv ntawm inductor yog dhau DC thiab thaiv AC. Qhov ntau zaus, qhov coil impedance ntau dua. Cov inductors feem ntau ua haujlwm nrog cov capacitors hauv circuits los tsim LC lim, LC oscillators, thiab lwm yam. Tsis tas li ntawd, tib neeg kuj siv cov yam ntxwv ntawm inductance los tsim choke coils, transformers, relays, thiab lwm yam. Direct tam sim no: Nws txhais tau tias cov inductor nyob rau hauv ib tug kaw. xeev mus rau direct tam sim no. Yog tias qhov tsis kam ntawm inductance coil tsis raug txiav txim siab, ces qhov ncaj qha tam sim no tuaj yeem dhau los ntawm inductor "unmpeded". Rau cov tam sim no ncaj qha, qhov tsis kam ntawm lub kauj nws tus kheej muaj kev cuam tshuam me ntsis ntawm qhov ncaj qha tam sim no, yog li feem ntau tsis quav ntsej hauv kev txheeb xyuas Circuit Court.
Thaiv alternating tam sim no: Thaum alternating tam sim no dhau los ntawm inductive coil, inductor hinds lub alternating tam sim no, thiab nws yog inductive reactance ntawm inductive kauj uas cuam tshuam cov alternating tam sim no.
3. Inductance qauv
Inductors feem ntau yog tsim los ntawm cov pob txha, windings, shields, ntim khoom, sib nqus cores lossis hlau cores.
1. Skeleton Cov pob txha feem ntau yog hais txog lub bracket rau winding lub kauj. Qee qhov loj ruaj khov inductors lossis adjustable inductors (xws li oscillating coils, choke coils, thiab lwm yam), feem ntau yog cov hlau enameled (los yog cov xov paj npog) nyob ib ncig ntawm lub cev pob txha, thiab tom qab ntawd cov hlau nplaum los yog tooj liab, hlau core, thiab lwm yam. .Nruab rau hauv kab noj hniav ntawm lub cev pob txha kom nws inductance. Lub cev pob txha feem ntau yog ua los ntawm cov yas, bakelite, thiab ceramics, thiab tuaj yeem ua rau ntau hom raws li qhov xav tau tiag tiag. Cov inductors me me (xws li xim-coded inductors) feem ntau tsis siv lub bobbin, tab sis tsis txhob muaj cov enameled hlau qhov txhab ncaj qha nyob ib ncig ntawm lub hauv paus. Cua-core inductors (tseem hu ua unwrapped coils los yog cua-core coils, feem ntau yog siv nyob rau hauv high-frequency circuits) tsis siv magnetic cores, skeletons thiab shields, thiab lwm yam., tab sis yog thawj qhov txhab ntawm cov pwm thiab ces tshem tawm cov pwm. , thiab lub kauj yog rub ntawm txhua lub kauj. Tsav ib qho kev ncua deb.
2. Winding Winding yog hais txog ib pab pawg ntawm cov coils nrog cov haujlwm tshwj xeeb, uas yog qhov tseem ceeb ntawm inductors. Muaj ib txheej txheej thiab ntau txheej windings. Muaj ob hom ntawm ib txheej windings: tuab winding (cov neeg xyuas pib raug mob ib zaug ib zaug) thiab nruab nrab winding (muaj qee qhov kev ncua deb ntawm txhua qhov tig ntawm cov xov hlau thaum winding); multi-layer windings muaj txheej ca winding, random winding Winding, honeycomb winding, thiab lwm yam.
3. Sib nqus cores thiab magnetic rods Sib nqus cores thiab magnetic rods feem ntau yog ua los ntawm nickel-zinc ferrite (NX series) los yog manganese-zinc ferrite (MX series) thiab lwm yam ntaub ntawv. Zoo, tuaj yeem tsim thiab lwm yam duab.
4. Hlau core Cov khoom siv hlau feem ntau suav nrog silicon steel ntawv, permalloy, thiab lwm yam, thiab nws cov duab feem ntau yog "E" hom.
5. Kev tiv thaiv npog Txhawm rau tiv thaiv cov hlau nplaum uas tsim los ntawm qee qhov inductors los ntawm kev cuam tshuam rau kev ua haujlwm ib txwm muaj ntawm lwm cov khoom siv hluav taws xob thiab cov khoom siv, lub npov hlau npog (xws li oscillation coil ntawm lub xov tooj cua semiconductor, thiab lwm yam) ntxiv rau nws. Kev siv cov shielded inductors yuav ua rau kom poob ntawm lub kauj thiab txo tus nqi Q.
6. Cov khoom ntim tom qab qee qhov inductors (xws li xim code inductors, xim nplhaib inductors, thiab lwm yam) raug mob, cov coils thiab cov hlau nplaum sib nqus raug kaw nrog cov khoom ntim. Cov khoom siv encapsulation yog yas lossis epoxy resin.
Plaub, qhov tseem ceeb ntawm cov inductor
1. Inductance
Inductance, tseem hu ua tus kheej inductance coefficient, yog lub cev muaj nuj nqis uas sawv cev rau lub peev xwm ntawm inductor los tsim tus kheej induction. Qhov loj ntawm qhov inductance ntawm inductor feem ntau yog nyob ntawm tus naj npawb ntawm cov lem (ntau zaus) ntawm lub kauj, txoj kev winding, muaj los yog tsis muaj cov tub ntxhais sib nqus thiab cov khoom ntawm cov hlau nplaum, thiab lwm yam. coil tig thiab denser lub coils raug mob, qhov ntau dua qhov inductance. Lub coil nrog ib tug sib nqus core muaj ib tug loj inductance tshaj lub kauj tsis muaj ib tug sib nqus core; ib co coil nrog ib tug loj magnetic core permeability muaj ib tug loj inductance.
Lub hauv paus ntawm inductance yog Henry (hu ua Henry), uas yog sawv cev los ntawm tsab ntawv "H". Feem ntau siv yog millihenry (mH) thiab microhenry (μH). Kev sib raug zoo ntawm lawv yog:
1H=1000mH
1 mH =1000μH
2. Tso cai sib txawv
Qhov tso cai sib txawv yog hais txog qhov tso cai yuam kev ntawm qhov nominal inductance ntawm inductor thiab qhov tseeb inductance. Inductors feem ntau siv nyob rau hauv circuits xws li oscillation los yog filtering yuav tsum tau high precision, thiab qhov tso cai sib txawv yog ±{{0}}.2 feem pua 0.5 feem pua ; thaum cov kev cai raug rau coils xws li coupling thiab high-frequency blocking tam sim no tsis siab; Qhov sib txawv ntawm qhov tso cai yog ± 10% ~ 15 feem pua.
3. Qhov zoo tshaj plaws
Qhov zoo tshaj plaws, tseem hu ua Q tus nqi lossis daim duab ntawm qhov tsim nyog, yog qhov tseem ceeb ntsuas qhov zoo ntawm inductor. Nws hais txog qhov sib piv ntawm inductive reactance nthuav tawm los ntawm inductor rau nws qhov sib npaug poob tsis kam thaum nws ua haujlwm hauv AC voltage ntawm qee zaus. Qhov siab dua Q ntawm inductor, nws qhov poob qis thiab qhov ua tau zoo dua. Qhov zoo tshaj plaws ntawm cov inductor yog cuam tshuam nrog DC tsis kam ntawm cov coil hlau, qhov dielectric poob ntawm lub coil skeleton, thiab poob los ntawm cov tub ntxhais hlau thiab cov ntaub thaiv npog.
4. Distribution capacitance
Distributed capacitance yog hais txog lub capacitance uas muaj nyob nruab nrab ntawm kev hloov ntawm lub kauj, nruab nrab ntawm lub kauj thiab cov hlau nplaum, nruab nrab ntawm lub kauj thiab hauv av, thiab nruab nrab ntawm lub kauj thiab cov hlau. Qhov me dua qhov faib capacitance ntawm inductor, qhov zoo dua nws cov stability. Distributed capacitance tuaj yeem ua rau qhov sib npaug ntawm lub zog dissipation kuj loj dua thiab qhov zoo tshaj qhov loj dua. Txhawm rau txo cov kev faib tawm, cov xaim npog xaim lossis ntau txoj hlua enameled hlau feem ntau yog siv, thiab qee zaum siv txoj kev siv honeycomb winding.
5. Rated tam sim no
Qhov ntsuas tam sim no yog hais txog tus nqi siab tshaj plaws tam sim no uas tus inductor tuaj yeem tiv taus raws li qhov chaw ua haujlwm tau tso cai. Yog hais tias qhov kev khiav hauj lwm tam sim no tshaj qhov ntsuas tam sim no, qhov kev ua haujlwm tsis zoo ntawm cov inductor yuav hloov pauv vim qhov tsim hluav taws xob, thiab txawm tias hlawv tawm vim overcurrent.
Tsib, kev ua haujlwm ntawm inductor
Cov inductors tsuas yog ua si lub luag haujlwm ntawm kev lim dej, oscillation, ncua sijhawm thiab notch hauv Circuit Court, nrog rau cov teeb liab lim, lim suab nrov, stabilizing tam sim no thiab suppressing electromagnetic yoj cuam tshuam. Lub luag haujlwm feem ntau ntawm inductors hauv circuits yog tsim LC lim circuits ua ke nrog capacitor. Capacitors muaj cov yam ntxwv ntawm "kev thaiv DC thiab dhau AC", thaum inductors muaj kev ua haujlwm ntawm "dhau DC thiab thaiv AC". Yog tias DC nrog ntau lub teeb liab cuam tshuam tau dhau los ntawm LC lim Circuit Court, AC cuam tshuam teeb liab yuav raug siv los ntawm inductance rau hauv lub zog hluav taws xob; Thaum lub purer DC tam sim no dhau los ntawm inductor, AC cuam tshuam teeb liab kuj yuav raug hloov mus rau hauv magnetic induction. Thiab lub zog thermal, qhov ntau zaus feem ntau yog impedance los ntawm inductor, uas tuaj yeem cuam tshuam cov teeb liab cuam tshuam ntau dua.
Inductors muaj cov cuab yeej ntawm thaiv qhov kev hla ntawm kev hloov tam sim no thiab tso cai rau tam sim no kom dhau mus zoo. Qhov ntau zaus, qhov coil impedance ntau dua. Yog li, lub luag haujlwm tseem ceeb ntawm cov inductor yog cais tawm thiab lim cov teeb liab AC lossis tsim ib lub voj voog resonant nrog cov capacitors thiab resistors.
6. Yuav ua li cas txiav txim qhov zoo ntawm inductance nrog ib tug multimeter
1. Kev ntsuas inductance: tig lub multimeter mus rau lub buzzer diode iav, muab qhov kev xeem coj mus rau ob tus pins, thiab pom kev nyeem ntawv ntawm multimeter.
2. Kev txiav txim siab ntawm qhov zoo lossis qhov tsis zoo: Kev nyeem ntawv ntawm nti inductance yuav tsum yog xoom nyob rau lub sijhawm no. Yog hais tias qhov kev nyeem ntawv multimeter loj dhau los yog tsis kawg, nws txhais tau tias qhov inductance puas lawm.
Rau inductive coils nrog ib tug loj tus naj npawb ntawm lem thiab ib tug nyias hlau txoj kab uas hla, kev nyeem ntawv yuav ncav cuag kaum mus rau pua pua zaus. Feem ntau, DC tsis kam ntawm lub kauj tsuas yog ob peb ohms. Qhov kev puas tsuaj yog manifested li kub los yog pom tseeb kev puas tsuaj rau lub inductance magnetic nplhaib. Yog tias cov kauj inductance tsis raug puas tsuaj loj thiab tsis tuaj yeem txiav txim siab, qhov inductance tuaj yeem ntsuas nrog lub ntsuas ntsuas inductance lossis hloov txoj kev tuaj yeem siv los txiav txim.
Rau lub inductor coil nrog cov ntaub thaiv npog hlau, nws tseem yuav tsum tau xyuas seb puas muaj qhov luv luv ntawm lub kauj thiab cov ntaub thaiv npog. Yog hais tias qhov kev tiv thaiv ntawm txhua tus pin ntawm lub kauj thiab lub casing (cov ntaub thaiv npog) kuaj pom los ntawm multimeter tsis yog qhov kawg, tab sis muaj qee qhov kev tiv thaiv tus nqi lossis xoom tsis kam, nws txhais tau hais tias lub inductor yog luv luv-circuited.
Cov kev ceev faj:
1. Rau inductive Cheebtsam, cov tub ntxhais thiab windings yog nquag hloov nyob rau hauv inductance vim qhov kub thiab txias. Nws yuav tsum tau muab sau tseg hais tias qhov kub ntawm lub cev yuav tsum nyob rau hauv lub Scope ntawm kev siv specifications. .
2. Lub winding ntawm lub inductor yog ib qho yooj yim los tsim ib qho chaw electromagnetic tom qab qhov tam sim no dhau mus. Thaum tso cov khoom, ua tib zoo saib xyuas kom cov inductors nyob ib sab ntawm ib leeg, los yog ua kom cov windings ntawm lub kaum sab xis rau ib leeg kom txo tau qhov kev sib nrig sib inductance.
3. Nyob nruab nrab ntawm cov khaubncaws sab nraud povtseg ntawm cov inductor, tshwj xeeb tshaj yog nyob rau hauv multi-tig nyias nyob ntawm tej, qhov sib txawv capacitance kuj yuav generated, uas yuav ua rau lub bypass ntawm lub high-frequency teeb liab thiab txo qhov tseeb filtering nyhuv ntawm inductor.
4. Thaum kuaj tus nqi inductance thiab Q tus nqi nrog cov cuab yeej, txhawm rau kom tau txais cov ntaub ntawv raug, cov hlau lead yuav tsum nyob ze rau ntawm lub cev tivthaiv raws li qhov ua tau.
