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Kudziwa Zamankhwala

Ndi machitidwe otani a maginito omwe amaphatikizidwa muzinthu zokhazikika?

Zochita zazikulu zamaginito zimaphatikizapo remanence(Br), maginito induction coercivity(bHc), intrinsic coercivity(jHc), and maximum energy product (BH)Max. Kupatula izi, pali zisudzo zina zingapo: Curie Temperature(Tc), Working Temperature(Tw), kutentha kwa remanence(α), kutentha kokwanira kwa intrinsic coercivity(β), permeability recovery of rec(μrec) ndi demagnetization curve rectangularity (Hk/jHc).

Kodi mphamvu ya maginito ndi chiyani?

M'chaka cha 1820, wasayansi HCOersted ku Denmark adapeza kuti singano pafupi ndi waya yomwe ili ndi zowonongeka zamakono, zomwe zimasonyeza ubale wofunikira pakati pa magetsi ndi maginito, ndiye, Electromagnetics anabadwa. Zochita zimasonyeza kuti mphamvu ya maginito ndi yapano yomwe ili ndi mawaya opanda malire omwe amapangidwa mozungulira ndi ofanana ndi kukula kwake, ndipo ndi yosiyana kwambiri ndi mtunda wa waya. Mu SI unit dongosolo, tanthauzo la kunyamula 1 amperes wa panopa wopandamalire waya pa mtunda wa 1/ waya (2 pi) maginito mphamvu mamita mtunda ndi 1A/m (an / M); kukumbukira chopereka cha Oersted ku electromagnetism, mu unit of CGS system, tanthauzo la kunyamula 1 amperes ya conductor wamakono wopandamalire mu mphamvu ya maginito ya 0.2 waya mtunda mtunda ndi 1Oe cm (Oster), 1/ (1Oe = 4 PI) * 103A/m, ndipo mphamvu ya maginito nthawi zambiri imawonetsedwa mu H.

Kodi maginito polarization (J) ndi chiyani maginito mphamvu (M), pali kusiyana kotani pakati pa awiriwa?

Kafukufuku wamakono a maginito akuwonetsa kuti zochitika zonse za maginito zimachokera ku zomwe zilipo panopa, zomwe zimatchedwa maginito dipole. The torque yaikulu ya magnetic field mu vacuum ndi maginito dipole mphindi Pm pa unit kunja maginito maginito, ndi maginito dipole mphindi pa unit voliyumu zakuthupi ndi J, ndipo gawo la SI ndi T (Tesla). Vector ya maginito mphindi pa voliyumu ya zinthu ndi M, ndi mphindi ya maginito ndi Pm/ μ0, ndi SI unit ndi A/m (M/m). Choncho, mgwirizano pakati pa M ndi J: J = μ0M, μ0 ndi wa vacuum permeability, mu SI unit, μ0 = 4π * 10-7H/m (H / m).

Kodi mphamvu ya maginito induction intensity (B) ndi chiyani (B), kuchuluka kwa maginito (B), pali ubale wotani pakati pa B ndi H, J, M?

Mphamvu ya maginito ikagwiritsidwa ntchito pa sing'anga iliyonse ya H, mphamvu ya maginito mkati mwa sing'anga si yofanana ndi H, koma mphamvu ya maginito ya H kuphatikizapo maginito a maginito J. Chifukwa chakuti mphamvu ya maginito mkati mwazinthu imasonyezedwa ndi maginito kumunda H kupyolera mukatikati mwa induction. Kuti tisiyanitse ndi H, timachitcha kuti maginito olowetsa maginito, otchedwa B: B = μ0H+J (SI unit) B=H+4πM (mayunitsi a CGS)
Chigawo cha mphamvu ya maginito B ndi T, ndipo CGS unit ndi Gs (1T=10Gs). Zochitika zamaginito zimatha kuyimiridwa momveka bwino ndi mizere ya maginito, ndipo maginito olowetsa maginito B angatanthauzidwenso kuti makulidwe a maginito. Magnetic induction B ndi maginito kuchulukirachulukira B angagwiritsidwe ntchito ponseponse pamalingaliro.

Zomwe zimatchedwa remanence (Br), zomwe zimatchedwa maginito coercive force (bHc), kodi mphamvu yokakamiza yamkati (jHc) ndi chiyani?

Magnet maginito maginito maginito kuti machulukitsidwe pambuyo kuchotsa kwa kunja maginito munda mu chatsekedwa boma, maginito maginito polarization J ndi mkati maginito induction B ndipo sizidzatha chifukwa cha kutha kwa H ndi kunja maginito munda, ndipo kusunga mtengo wina wake. Mtengowu umatchedwa maginito otsalira a maginito, omwe amatchedwa remanence Br, SI unit ndi T, CGS unit ndi Gs (1T=10⁴Gs). The demagnetization pamapindikira a maginito okhazikika, pamene n'zosiyana maginito maginito H ukuwonjezeka kwa mtengo wa bHc, ndi maginito kupatsidwa mphamvu maginito B maginito anali 0, wotchedwa H mtengo wa n'zosiyana maginito zinthu maginito coercivity wa bHc; mu reverse magnetic field H = bHc, sasonyeza mphamvu ya kunja maginito flux, ndi coercivity wa bHc khalidwe la okhazikika maginito chuma kukana kunja n'zosiyana maginito mphamvu kapena demagnetization zotsatira. Coercivity bHc ndi imodzi mwamagawo ofunikira pamapangidwe amagetsi amagetsi. Pamene n'zosiyana maginito munda H = bHc, ngakhale maginito si kusonyeza flux maginito, koma mphamvu maginito maginito J amakhalabe phindu lalikulu malangizo oyambirira. Chifukwa chake, mphamvu ya maginito ya bHc sikwanira kuwonetsa maginito. Pamene reverse magnetic field H ikukwera kufika ku jHc, vekitala ya micromagnetic dipole maginito yamkati ndi 0. The reverse magnetic field value amatchedwa intrinsic coercivity of jHc. Coercivity jHc ndi gawo lofunikira kwambiri lazinthu zokhazikika zamaginito, ndipo ndi mawonekedwe azinthu zamaginito osatha kukana reverse reverse magnetic field kapena demagnetization effect, kukhalabe ndi index yofunikira ya kuthekera kwake koyambirira kwa magnetization.

Kodi kuchuluka kwa mphamvu zamagetsi (BH) m ndi chiyani?

Mu BH pamapindikira a demagnetization ya zinthu zokhazikika maginito (pa quadrant yachiwiri), maginito osiyanasiyana ofananira ali pamikhalidwe yosiyanasiyana yogwirira ntchito. Mphepete mwa BH demagnetization wa malo enaake pa Bm ndi Hm (zopingasa ndi zopingasa) zimayimira kukula kwa maginito ndi mphamvu ya maginito induction ndi mphamvu ya maginito ya boma. Kuthekera kwa BM ndi HM kwa mtengo wathunthu wa mankhwala Bm * Hm ndi m'malo mwa momwe maginito amagwirira ntchito kunja, omwe ali ofanana ndi mphamvu ya maginito yosungidwa mu maginito, yotchedwa BHmax. Maginito mumkhalidwe wamtengo wapatali (BmHm) amayimira mphamvu ya maginito yakunja yogwira ntchito, yotchedwa mphamvu yayikulu kwambiri ya maginito, kapena mphamvu yamagetsi, yotchulidwa kuti (BH)m. BHmax unit mu SI system ndi J/m3 (joules/m3), ndi CGS system ya MGOe , 1MGOe = 10²/4π kJ/m3.

Kodi kutentha kwa Curie (Tc) ndi chiyani, kutentha kwa maginito (Tw) ndi chiyani?

Kutentha kwa Curie ndi kutentha komwe maginito azinthu zamaginito amatsikira ku ziro, ndipo ndiye mfundo yofunika kwambiri pakusinthika kwa zinthu za ferromagnetic kapena ferrimagnetic kukhala zida za paramagnetic. Kutentha kwa Curie Tc kumangogwirizana ndi kapangidwe kazinthuzo ndipo kulibe mgwirizano ndi mawonekedwe ang'onoang'ono azinthuzo. Pakutentha kwina, mphamvu ya maginito ya zinthu zokhazikika zamaginito imatha kuchepetsedwa ndi mitundu yodziwika bwino poyerekeza ndi kutentha kwachipinda. Kutentha kumatchedwa kutentha kwa ntchito ya maginito Tw. Kuchuluka kwa kuchepetsa mphamvu ya maginito kumadalira kugwiritsa ntchito maginito, ndi mtengo wosadziŵika, maginito okhazikika omwe amagwiritsidwa ntchito mosiyana ndi kutentha kwa ntchito Tw. Kutentha kwa Curie kwa Tc magnetic material kumayimira chiphunzitso cha kutentha kwa kutentha kwa zinthuzo. Ndikoyenera kudziwa kuti Tw yogwira ntchito ya maginito aliwonse okhazikika sikuti imangogwirizana ndi Tc, komanso yokhudzana ndi maginito a maginito, monga jHc, ndi momwe maginito amagwirira ntchito mu dera la maginito.

Kodi maginito permeability a maginito okhazikika (μrec), J demagnetization curve squareness ndi chiyani (Hk / jHc), akutanthauza?

Tanthauzo la demagnetization pamapindikira a BH maginito ntchito malo D kubwereza kusintha njanji mzere kumbuyo maginito zamphamvu, otsetsereka mzere kwa permeability kubwerera μrec. Mwachiwonekere, kubwereranso permeability μrec kumasonyeza kukhazikika kwa maginito pansi pazigawo zogwira ntchito. Ndilo kukula kwa maginito okhazikika a BH demagnetization curve, ndipo ndi imodzi mwazinthu zofunika kwambiri zamaginito zamaginito okhazikika. Kwa maginito a sintered Nd-Fe-B, μrec = 1.02-1.10, μrec yaying'ono ndi, kukhazikika kwa maginito kwabwinoko pansi pazikhalidwe zogwira ntchito.

Kodi maginito ozungulira ndi chiyani, maginito otseguka, otsekedwa-wozungulira ndi chiyani?

Dongosolo la maginito limatchedwa gawo linalake la mpweya, lomwe limaphatikizidwa ndi maginito amodzi kapena ambiri, waya wonyamulira, chitsulo molingana ndi mawonekedwe ndi kukula kwake. Chitsulo chikhoza kukhala chitsulo choyera, chitsulo chochepa cha carbon, Ni-Fe, Ni-Co alloy chokhala ndi zipangizo zamakono. Chitsulo chofewa, chomwe chimadziwikanso kuti goli, chimasewera kuyendetsa bwino, kukulitsa mphamvu yamagetsi yam'deralo, kuteteza kapena kuchepetsa kutsika kwa maginito, ndikuwonjezera mphamvu zamakina azinthu zomwe zimakhudzidwa ndi maginito. Maginito a maginito amodzi nthawi zambiri amatchedwa malo otseguka pamene chitsulo chofewa palibe; pamene maginito ali mu kayendedwe ka flux wopangidwa ndi chitsulo chofewa, maginito akuti ali mu dera lotsekedwa.

Kodi maginito a sintered Nd-Fe-B ndi chiyani?

Zomwe zimapangidwira maginito a sintered Nd-Fe-B:

Kupindika Mphamvu /MPa Kupsinjika Mphamvu / MPa Kulimba / Hv Yong Modulus /kN/mm2 Kutalikira/%
250-450 1000-1200 600-620 150-160 0

 Zitha kuwoneka kuti maginito a sintered Nd-Fe-B ndi chinthu chowoneka bwino. Panthawi yokonza, kusonkhanitsa ndi kugwiritsa ntchito maginito, m'pofunika kutchera khutu kuti maginito asasokonezedwe kwambiri, kugundana, komanso kupanikizika kwambiri, kuti mupewe kusweka kapena kugwa kwa maginito. N'zochititsa chidwi kuti mphamvu ya maginito sintered Nd-Fe-B maginito ndi wamphamvu kwambiri mu dziko maginito, anthu ayenera kusamalira chitetezo chawo pamene ntchito, kuteteza zala kukwera ndi amphamvu kuyamwa mphamvu.

Kodi ndi zinthu ziti zomwe zimakhudza kulondola kwa maginito a sintered Nd-Fe-B?

Zinthu zomwe zimakhudza kulondola kwa sintered Nd-Fe-B maginito ndi iye processing zida, zida ndi luso processing, ndi luso mlingo wa woyendetsa, etc. Komanso, yaying'ono-mapangidwe a zinthu ali ndi chikoka chachikulu pa. kulondola kwa makina a maginito. Mwachitsanzo, maginito ndi gawo lalikulu coarse njere, pamwamba sachedwa kukhala maenje pa Machining boma; maginito matenda kukula mbewu, pamwamba Machining boma sachedwa kukhala nyerere dzenje; kachulukidwe, kapangidwe kake ndi mawonekedwe ake ndizosafanana, kukula kwa chamfer kumakhala kosagwirizana; maginito okhala ndi okosijeni wapamwamba kwambiri amakhala osalimba, ndipo amatha kutsika pang'onopang'ono panthawi yopanga makina; maginito gawo lalikulu la mbewu coarse ndi Nd wolemera gawo kugawa si yunifolomu, yunifolomu plating adhesion ndi gawo lapansi, ❖ kuyanika makulidwe ofanana, ndi kukana dzimbiri ❖ kuyanika adzakhala oposa gawo lalikulu la mbewu zabwino ndi kugawa yunifolomu Nd. wolemera gawo kusiyana maginito thupi. Kuti apeze zinthu zamaginito za Nd-Fe-B zolondola kwambiri, injiniya wopangira zinthu, mainjiniya opanga makina ndi wogwiritsa ntchito ayenera kulumikizana mokwanira ndi kugwirizana wina ndi mnzake.