How to Prevent Demagnetization of U Shaped Magnets in High-Heat Environments

Magnet-yada neodymium-ka ee qaab-U-qaabeeyawaxay bixisaa diiradda birlabta aan la barbar dhigi karin - ilaa kulaylka uu ku dhaco. Codsiyada sida matoorada, dareemayaasha, ama mashiinnada warshadaha ee ka shaqeeya heerkul ka sarreeya 80°C, burburinta aan la soo celin karin waxay curyaamin kartaa waxqabadka. Marka U-magnet uu lumiyo 10% oo keliya qulqulka, goobta xoogga badan ee ku jirta farqiga ayaa burburta, taasoo keenta fashilka nidaamka. Waa kan sida loo difaaco naqshadahaaga:

Sababta Kulaylku si dhakhso leh ugu dilo U Magnets

Birlabyada Neodymium way burburaan marka tamarta kuleylku ay carqaladeyso iswaafajinta atomkooda. Qaababka U-qaabeeya waxay la kulmaan khataro gaar ah:

Cadaadiska Joomatari: Laabashadu waxay abuurtaa dhibco xiisad gudaha ah oo u nugul fiditaanka kulaylka.
Isu-ururinta Dareeraha: Cufnaanta sare ee goobta ee farqiga ayaa dardar gelisa luminta tamarta heerkulka sare.
Guuldarro aan sinnayn: Hal lug oo ka takhalusta birlabta ka hor inta aysan kan kale dheelitirin wareegga birlabta.

Istaraatiijiyadda Difaaca 5-ta Dhibcood

1. Xulashada Agabka: Ku bilow Darajada Saxda ah

Dhammaan NdFeB isku mid ma aha. Mudnaanta sii darajooyinka qasabka sare (taxanaha H):

Fasal	Heerkulka ugu Sareeya ee Op	Ku-xadgudubka Gudaha (Hci)	Kiiska Isticmaal
N42	80°C	≥12 kOe	Ka fogow kulaylka
N42H	120°C	≥17 kOe	Warshadaha guud
N38SH	150°C	≥23 kOe	Matoorada, dhaqaajiyeyaasha
N33UH	180°C	≥30 kOe	Gaadiidka/aerospace
Talada Xirfadeed: UH (Ultra High) iyo EH (Extra High) waxay bixiyaan xoogaa xoog ah si ay u ilaaliyaan kulaylka 2-3× oo ka sarreeya.

2. Difaaca Kulaylka: Jebi Wadada Kulaylka

Xeelad	Sida ay u Shaqeyso	Waxtarka
Meelaha Hawada ka banaan	Ka sooc birlabta laga helo isha kulaylka	↓10-15°C meelaha taabashada
Dareeraha Kulaylka	Kala-qaybiyayaasha dhoobada/polyimide	Baloogyada gudbinta
Qaboojinta Firfircoon	Kuleylka ama hawada qasabka ah	↓20-40°C oo ku jira meelo lagu kaydiyo
Dahaarka Milicsiga	Lakabyo dahab/aluminium ah	Waxay ka tarjumaysaa kulaylka dhalaalaya

Daraasad Kiis: Sameeyaha matoorka servo wuxuu yareeyay cilladaha U-magnet 92% ka dib markii lagu daray 0.5mm kala-goysyada mica inta u dhaxaysa gariiradaha iyo birlabta.

3. Naqshadeynta Wareegga Birlabta: Heerkulka Ka Sareeya ee Aan Caqli Lahayn

Qalabka Dareeraha: Taarikada birta ah ee ku wareegsan farqiga U waxay ilaaliyaan wadada dareeraha inta lagu jiro shoogga kulaylka.
Magnetization Qayb ah: Ku socodsii birlabta 70-80% dhereg buuxa si aad uga tagto "madaxa" si aad u hesho kulaylka.
Naqshadaha Wareega Xiran: Ku dheji U-magnets-ka guryaha birta ah si loo yareeyo soo-gaadhista hawada loona xasiliyo qulqulka.

"Qalabka ilaalinta ee si fiican loo qaabeeyey wuxuu yareynayaa khatarta burburinta magnetization 40% marka la eego 150°C marka loo eego U-magnets-ka qaawan."
- Wax-is-weydaarsiga IEEE ee Magnetics-ka

4. Ilaalinta Hawlgalka

Qaloocyada Kala-goynta: Weligaa ha dhaafin xadka heerkulka gaarka u ah darajada (fiiri jaantuska hoose).
La socodka Kulaylka: Dareemayaasha ku dheji meel u dhow U-lugs si aad u hesho digniino waqtiga-dhabta ah.
Ka fogow Baaskiil wadista: Kuleylka/qaboojinta degdega ah waxay sababtaa dildilaacyo yaryar → si dhakhso ah u furfurid.

Tusaale Qallooca Derating (Darajada N40SH):

Heerkulka (°C) │ 20° │ 100° │ 120° │ 150°

Khasaare Br │ 0% │ 8% │ 15% │ 30%*

5. Dahaarka Sare iyo Isku-xidhka

Xoojinta Epoxy: Waxay buuxisaa jajabyada yaryar ee ka yimaada ballaarinta kulaylka.
Dahaarka Heerkulka Sare: Parylene HT (≥400°C) wuxuu ka sarreeyaa dahaadhka NiCuNi ee caadiga ah ee ka sarreeya 200°C.
Xulashada dhejiska: Isticmaal epoxies-ka galaaska lagu buuxiyay (heerkulka adeegga >180°C) si looga hortago kala-goynta birlabta.

Calanka Cas: Ma Magnet-kaagu ma fashilmayaa?

Soo ogow kala-soocidda marxaladda hore:

Isku-dheelitir la'aanta Goobta: >10% farqiga qulqulka u dhexeeya U-lugaha (cabirka iyadoo la adeegsanayo baaritaanka Hall).
Heerkulka oo si tartiib tartiib ah u soo boodaya: Magnet-ku wuxuu dareemayaa inuu ka kulul yahay deegaanka - wuxuu tilmaamayaa khasaaraha hadda jira.
Hoos u dhac ku yimaada waxqabadka: Matooradu waxay lumiyaan awoodda, dareemayaasha waxay muujiyaan qulqulka, kala-soocayaashu waxay seegaan wasakhda birta.

Marka Ka Hortagga uu Fashilmo: Xeeladaha Badbaadada

Dib-u-magnetization: Suurtagal ah haddii walaxdu aysan si qaab-dhismeed ahaan u dhaawacmin (waxay u baahan tahay > 3T field pulse).
Dib-u-daboolid: Dahaadh bir ah oo mirdhay, dib u mari dahaadh heerkul sare leh.
Hab-raaca Beddelka: Ku beddel darajooyinka SH/UH + casriyeynta kulaylka.

Qaacidada Guusha

Heerka Sare ee HCI + Kaydinta Kulaylka + Naqshadeynta Wareegga Caqliga leh = Magnet-yada U ee u adkaysta Kulaylka

Magnet-yada neodymium-ka ee qaab-dhismeedka U-qaabeeya waxay ku koraan jawi adag marka aad:

Dooro darajooyinka SH/UH diin ahaan si aad u hesho codsiyada ka badan 120°C
Ka go'doon ilaha kulaylka iyadoo la adeegsanayo caqabadaha hawada/dhoobada
Xasili qulqulka adigoo isticmaalaya qalabka ilaalinta ama guryaha
Heerkulka la soco meesha uu ku yaallo farqiga

Mashruucaaga Birlabta Neodymium ee Gaarka ah

Waxaan bixin karnaa adeegyada OEM/ODM ee alaabtayada. Badeecada waxaa loo habeyn karaa iyadoo loo eegayo shuruudahaaga shaqsiyeed, oo ay ku jiraan cabbirka, qaabka, waxqabadka, iyo dahaarka. fadlan bixi dukumeentiyadaada naqshadeynta ama noo sheeg fikradahaaga kooxdayada cilmi-baarista iyo horumarinta ayaa inta kale qaban doonta.