Posachedwapa, pamene teknoloji ikukula kufupipafupi komanso kuthamanga kwambiri, kutayika kwa maginito kwamakono kwakhala vuto lalikulu. Makamaka aNeodymium Iron Boron(NdFeB) ndiSamarium Cobalt(SmCo) maginito, amakhudzidwa mosavuta ndi kutentha. Kutayika kwamakono kwa eddy kwakhala vuto lalikulu.
Mafunde a eddy awa nthawi zonse amabweretsa kutentha, ndiyeno kuwonongeka kwa magwiridwe antchito a injini, ma jenereta, ndi masensa. Ukadaulo wamakono wa anti-eddy wa maginito nthawi zambiri umapondereza m'badwo wa eddy wapano kapena kupondereza kusuntha kwaposachedwa.
"Maginito Mphamvu" yapangidwa luso Anti-eddy-panopa wa NdFeB ndi maginito SmCo.
The Eddy Currents
Mafunde a Eddy amapangidwa muzinthu zamagetsi zomwe zili m'malo amagetsi osinthika kapena maginito. Malinga ndi lamulo la Faraday, mphamvu za maginito zimapanga magetsi, ndipo mosinthanitsa. M'makampani, mfundoyi imagwiritsidwa ntchito posungunula zitsulo. Kupyolera mu induction yapakati-frequency induction, zinthu zopangira mu crucible, monga Fe ndi zitsulo zina, zimapangitsidwa kuti zipange kutentha, ndipo potsiriza zida zolimba zimasungunuka.
The resistivity wa NdFeB maginito, SmCo maginito kapena Alnico maginito nthawizonse otsika kwambiri. Zowonetsedwa patebulo 1. Chifukwa chake, ngati maginitowa amagwira ntchito pazida zamagetsi, kulumikizana pakati pa maginito ndi zigawo zoyendetsera kumatulutsa mafunde a eddy mosavuta.
Table1 The resistivity wa NdFeB maginito, SmCo maginito kapena Alnico maginito
| Maginito | Rmphamvu (mΩ·cm) |
| Alnico | 0.03-0.04 |
| SmCo | 0.05-0.06 |
| Ndi FeB | 0.09-0.10 |
Malinga ndi Lamulo la Lenz, mafunde a Eddy opangidwa mu maginito a NdFeB ndi SmCo, amatsogolera kuzinthu zingapo zosafunikira:
● Kutha kwa Mphamvu: Chifukwa cha mafunde a eddy, gawo la mphamvu ya maginito limasandulika kutentha, kuchepetsa mphamvu ya chipangizocho. Mwachitsanzo, kutayika kwachitsulo ndi kutayika kwa mkuwa chifukwa cha eddy pano ndiye chinthu chofunikira kwambiri pakuchita bwino kwa ma mota. Pankhani yochepetsa kutulutsa mpweya wa kaboni, kuwongolera magwiridwe antchito amagalimoto ndikofunikira kwambiri.
● Kutentha kwa kutentha ndi Demagnetization: Onse maginito NdFeB ndi SmCo ndi pazipita ntchito kutentha awo, amene ndi yofunika chizindikiro cha maginito okhazikika. Kutentha kopangidwa ndi eddy kutayika kwapano kumapangitsa kutentha kwa maginito kukwera. Kutentha kwakanthawi kochepa kogwira ntchito kukapitilira, demagnetization idzachitika, zomwe pamapeto pake zidzadzetsa kuchepa kwa ntchito ya chipangizocho kapena zovuta zazikulu zogwirira ntchito.
Makamaka pambuyo pakukula kwa ma mota othamanga kwambiri, monga maginito okhala ndi maginito ndi ma mota okhala ndi mpweya, vuto la demagnetization la rotor lakhala lodziwika kwambiri. Chithunzi 1 chikuwonetsa rotor ya injini yonyamula mpweya ndi liwiro la30,000RPM. Kutentha kunakwera pafupifupi500°C, zomwe zimapangitsa kuti maginito awonongeke.
Chithunzi 1. a ndi c ndi chithunzi cha maginito ndikugawa kwa rotor wamba, motsatana.
b ndi D ndi chithunzi cha maginito ndikugawa kozungulira kopanda maginito, motsatana.
Komanso, NdFeB maginito ndi otsika Curie kutentha (~ 320 ° C), zomwe zimawapangitsa demagnetization. Kutentha kwa curie kwa maginito a SmCo, kumakhala pakati pa 750-820 ° C. NdFeB ndiyosavuta kukhudzidwa ndi eddy pano kuposa SmCo.
Anti-Eddy Current Technologies
Njira zingapo zapangidwa kuti zichepetse mafunde a eddy mu maginito a NdFeB ndi SmCo. Njira yoyamba iyi ndikusintha kapangidwe kake ndi kapangidwe ka maginito kuti apititse patsogolo mphamvu ya resistivity. Njira yachiwiri yomwe imagwiritsidwa ntchito nthawi zonse mu engineering kusokoneza mapangidwe a malupu akuluakulu a eddy panopa.
1.Enhance resistivity wa maginito
Gabay et.al awonjezedwa CaF2, B2O3 ku maginito a SmCo kuti apititse patsogolo mphamvu, zomwe zimakulitsidwa kuchokera ku 130 μΩ cm mpaka 640 μΩ cm. Komabe, (BH) max ndi Br adatsika kwambiri.
2. Kuwala kwa maginito
Laminating maginito, ndi njira yothandiza kwambiri mu uinjiniya.
Maginitowo anawadula n’kukhala timagulu tating’ono ting’onoting’ono n’kumamatira pamodzi. Maonekedwe apakati pa zidutswa ziwiri za maginito ndi zomatira zomatira. Njira yamagetsi yamagetsi a eddy imasokonekera. Ukadaulo uwu umagwiritsidwa ntchito kwambiri pamakina othamanga kwambiri ndi ma jenereta. "Maginito Mphamvu" yapangidwa matekinoloje ambiri kuti apititse patsogolo mphamvu ya maginito. https://www.magnetpower-tech.com/high-electrical-impedance-eddy-current-series-product/
Chinthu choyamba chofunika kwambiri ndi resistivity. The resistivity wa laminated NdFeB ndi SmCo maginito opangidwa ndi "Maginito Mphamvu" ndi apamwamba kuposa 2 MΩ · masentimita. Maginito amenewa akhoza kwambiri ziletsa conduction panopa mu maginito ndiyeno kupondereza m'badwo kutentha.
Gawo lachiwiri ndi makulidwe a guluu pakati pa zidutswa za maginito. Ngati makulidwe a guluu wosanjikiza ndi apamwamba kwambiri, zipangitsa kuti voliyumu ya maginito ikhale yochepa, zomwe zimapangitsa kuchepa kwa maginito onse. "Maginito Mphamvu" amatha kupanga maginito laminated ndi makulidwe a guluu wosanjikiza 0.05mm.
3. Kupaka ndi Zida Zapamwamba Zotsutsa
Zotchingira zotchingira nthawi zonse zimagwiritsidwa ntchito pamwamba pa maginito kuti zithandizire kupirira kwa maginito. Kupaka uku kumakhala ngati zotchinga, kuti muchepetse kuthamanga kwa mafunde a eddy pamwamba pa maginito. Monga epoxy kapena parylene, zokutira za ceramic zimagwiritsidwa ntchito nthawi zonse.
Ubwino wa Anti-Eddy Current Technology
Ukadaulo waposachedwa wa Anti-eddy ndiwofunikira pamagwiritsidwe ambiri ndi maginito a NdFeB ndi SmCo. Kuphatikizapo:
● Hma motors othamanga: M'magalimoto othamanga kwambiri, zomwe zikutanthauza kuti liwiro liri pakati pa 30,000-200,000RPM, kupondereza eddy panopa komanso kuchepetsa kutentha ndilofunika kwambiri. Chithunzi 3 limasonyeza kutentha poyerekeza yachibadwa SmCo maginito ndi odana Eddy panopa SmCo mu 2600Hz. Pamene kutentha yachibadwa SmCo maginito (kumanzere wofiira mmodzi) upambana 300 ℃, kutentha odana Eddy maginito SmCo (kumanja bule imodzi) si upambana 150 ℃.
●Makina a MRI: Kuchepetsa mafunde a eddy n'kofunika kwambiri mu MRI kuti apitirizebe kukhazikika kwa machitidwe.
Ukadaulo waposachedwa wa Anti-eddy ndi wofunikira kwambiri pakuwongolera magwiridwe antchito a maginito a NdFeB ndi SmCo pazogwiritsa ntchito zambiri. Pogwiritsa ntchito matekinoloje a lamination, segmentation, ndi zokutira, mafunde a eddy amatha kuchepetsedwa kwambiri mu "Magnet Power". Maginito odana ndi eddy a NdFeB ndi SmCo amatha kugwiritsidwa ntchito m'makina amakono amagetsi.
Nthawi yotumiza: Sep-23-2024
