N'oge na-adịbeghị anya, ka teknụzụ na-etolite n'ebe dị elu na ọsọ ọsọ dị elu, mfu nke magnets ugbu a aghọwo nnukwu nsogbu. Karịsịa nkeNeodymium Iron boron(NdFeB) na ndịSamarium Cobalt(SmCo) magnetik, okpomọkụ na-emetụta ngwa ngwa. Ọnwụ dị ugbu a abụrụla nnukwu nsogbu.
Igwe mmiri ndị a na-eme mgbe niile na-ebute ọgbọ nke okpomọkụ, wee mebie arụmọrụ na moto, ndị na-emepụta ọkụ na ihe mmetụta. Nkà na ụzụ na-emegide mmegide ugbu a nke ndọta na-egbochikarị ọgbọ nke eddy current ma ọ bụ na-egbochi mmegharị nke ugbu a na-akpalite.
“Ike Igwe Ọdụdọ” emepụtala teknụzụ mgbochi-ụgbụ a nke NdFeB na SmCo magnetik.
Ihe Eddy Currents
A na-emepụta ebili mmiri na-agbagharị agbagharị n'ime ihe ndị na-eduzi nke dị na mpaghara eletrik ọzọ ma ọ bụ ebe ndọta ọzọ. Dị ka iwu Faraday si kwuo, oghere magnetik na-agbanwe agbanwe na-emepụta ọkụ eletrik, na nke ọzọ. N'ime ụlọ ọrụ, a na-eji ụkpụrụ a mee ihe na mgbaze metallurgical. Site na ntinye nke ugboro ugboro, ihe ndị na-eduzi na crucible, dị ka Fe na ọla ndị ọzọ, na-eme ka ọ bụrụ ọkụ, n'ikpeazụkwa, a na-agbaze ihe ndị siri ike.
The resistivity nke NdFeB magnetik, SmCo magnetik ma ọ bụ Alnico magnetik na-adị ala mgbe niile. Egosiri na tebụl 1. Ya mere, ọ bụrụ na ndọta ndị a na-arụ ọrụ na ngwaọrụ electromagnetic, mmekọrịta dị n'etiti magnetik flux na ihe ndị na-eduzi na-eme ka mmiri dị nro dị mfe.
Isiokwu 1 The resistivity nke NdFeB magnetik, SmCo magnetik ma ọ bụ Alnico magnetik
| Igwe igwe | Resistivity (mΩ·cm) |
| Alnico | 0.03-0.04 |
| SmCo | 0.05-0.06 |
| NdFeB | 0.09-0.10 |
Dị ka Lenz's Law si kwuo, Eddy currents emepụtara na NdFeB na magnet SmCo, na-eduga n'ọtụtụ mmetụta na-adịghị mma:
● Ike mfu: N'ihi ụda ọkụ ọkụ, akụkụ nke ike magnetik na-agbanwe n'ime okpomọkụ, na-ebelata arụmọrụ nke ngwaọrụ ahụ. Dị ka ihe atụ, ígwè ọnwụ na ọla kọpa ọnwụ n'ihi eddy ugbu a bụ isi ihe na-arụ ọrụ nke Motors. N'ihe gbasara mbelata ikuku carbon, imeziwanye arụmọrụ nke moto dị ezigbo mkpa.
● Ọgbọ okpomọkụ na Demagnetization: Ma NdFeB na SmCo magnetik nwere oke okpomọkụ ha na-arụ ọrụ, nke bụ oke dị egwu nke magnets na-adịgide adịgide. Okpomọkụ nke eddy na-efunahụ ugbu a na-eme ka okpomọkụ nke magnet na-ebili. Ozugbo oke okpomọkụ na-arụ ọrụ gafere, demagnetization ga-eme, nke ga-emecha mee ka mbelata ọrụ nke ngwaọrụ ma ọ bụ nsogbu arụmọrụ siri ike.
Karịsịa mgbe mmepe nke moto ndị na-agba ọsọ dị elu, dị ka magnetik bearing motors na ikuku ikuku, nsogbu demagnetization nke rotors aghọwo ihe a ma ama. Ọgụgụ 1 na-egosi rotor nke moto na-ebu ikuku nwere ọsọ nke30,000RPM. Okpomọkụ mechara bilie ihe dị ka500°C, na-akpata demagnetization nke magnet.
Fig1. a na c bụ eserese ndọta na nkesa rotor nkịtị, n'otu n'otu.
b na d bụ eserese ndọta na nkesa rotor demagnetized, n'otu n'otu.
Ọzọkwa, NdFeB ndọta nwere obere Curie okpomọkụ (~ 320°C), nke na-eme ka ha demagnetization. Okpomọkụ curie nke magnetik SmCo, dị n'etiti 750-820 Celsius. NdFeB dị mfe na eddy current emetụta ya karịa SmCo.
Teknụzụ Anti-Eddy Ugbu a
E mepụtala ọtụtụ ụzọ iji belata ikuku mmiri dị na NdFeB na magnet SmCo. Ụzọ mbụ ndị a bụ ịgbanwe nhazi na nhazi nke magnet iji welie resistivity. Ụzọ nke abụọ nke a na-eji mgbe niile na injinia na-akpaghasị nhazi nke nnukwu loops eddy ugbu a.
1.Enhance resistivity nke magnet
Gabay et.al agbakwunyere CaF2, B2O3 na magnetik SmCo iji melite resistivity, nke a na-akwalite site na 130 μΩ cm ruo 640 μΩ cm. Agbanyeghị, (BH) max na Br belatara nke ukwuu.
2. Lamination nke Igwe Ọdụdọ
Laminating magnetik, bụ usoro kachasị dị irè na injinịa.
A na-egbujisị ihe ndọta ahụ n'ime mpekere dị gịrịgịrị wee jikọta ha ọnụ. Oghere dị n'etiti iberibe magnet abụọ na-ekpuchi gluu. A na-akpaghasị ụzọ eletrik maka ikuku mmiri. A na-eji teknụzụ a eme ihe na moto na-agba ọsọ ọsọ na ndị na-emepụta ọkụ. "Ike Igwe Ọdụdọ" emebela ọtụtụ teknụzụ iji meziwanye ihe mgbochi nke magnetik. https://www.magnetpower-tech.com/high-electrical-impedance-eddy-current-series-product/
Nke mbụ dị oke egwu oke bụ resistivity. Iguzogide ihe ndọta NdFeB na SmCo mebere nke “ike ndọta” dị elu karịa 2 MΩ·cm. Ihe ndọta ndị a nwere ike igbochi mmegharị nke ugbu a na ndọta wee gbochie ọgbọ okpomọkụ.
Oke nke abụọ bụ ọkpụrụkpụ nke gluu n'etiti iberibe ihe ndọta. Ọ bụrụ na ọkpụrụkpụ nke oyi akwa gluu dị elu nke ukwuu, ọ ga-eme ka ụda magnet ahụ belata, na-ebute mbelata n'ozuzu magnetik. "Ike Igwe Ọdụdọ" nwere ike ịmepụta magnetik laminated na ọkpụrụkpụ nke gluu oyi akwa nke 0.05mm.
3. Mkpuchi na ihe ndị dị elu na-eguzogide
A na-etinye mkpuchi mkpuchi mgbe niile n'elu ihe ndọta iji welie ihe mgbochi nke magnetik. Ihe mkpuchi ndị a na-arụ ọrụ dị ka ihe mgbochi, iji belata mmiri na-asọ asọ n'elu magnet. Dị ka epoxy ma ọ bụ parylene, nke mkpuchi seramiiki na-ejikarị eme ihe.
Uru nke Anti-Eddy Technology dị ugbu a
Teknụzụ na-emegide mmechi dị ugbu a dị mkpa etinyere n'ọtụtụ ngwa nwere ndọta NdFeB na SmCo. Gụnyere:
● Hmoto na-agba ọsọ: Na moto ndị na-agba ọsọ dị elu, nke pụtara na ọsọ dị n'etiti 30,000-200,000RPM, iji gbochie eddy ugbu a na iji belata okpomọkụ bụ isi ihe achọrọ. Onyonyo 3 na-egosi ntule okpomoku nke SmCo magnetik na mgbochi mmegide dị ugbu a na 2600Hz. Mgbe ọnọdụ okpomọkụ nke magnetik SmCo nkịtị (aka ekpe na-acha uhie uhie) karịrị 300 ℃, okpomọkụ nke ihe mgbochi SmCo dị ugbu a (nri bule otu) anaghị agafe 150 ℃.
●Igwe MRI: Ịbelata mmiri ozuzo dị oke egwu na MRI iji nọgide na-enwe nkwụsi ike nke usoro.
Nkà na ụzụ ọgbara ọhụrụ dị ugbu a dị ezigbo mkpa maka ịkwalite arụmọrụ NdFeB na magnet SmCo n'ọtụtụ ngwa. Site n'iji lamination, nkewa, na teknụzụ mkpuchi, enwere ike ibelata ikuku mmiri na "Ike Magnet". Ọ ga-ekwe omume itinye ihe ndọta NdFeB na SmCo na-eme ihe na sistemụ elektrọnik ọgbara ọhụrụ.
Oge nzipu: Sep-23-2024
