Tsis ntev los no, raws li thev naus laus zis txhim kho mus rau qhov muaj zaus thiab kev kub ceev, eddy tam sim no poob ntawm cov hlau nplaum tau dhau los ua teeb meem loj. Tshwj xeeb tshaj yog covNeodymium hlau boron(NdFeB) thiabSamarium Cobalt(SmCo) hlau nplaum, yooj yim dua cuam tshuam los ntawm qhov kub thiab txias. Qhov eddy tam sim no poob tau dhau los ua teeb meem loj.
Cov eddy tam sim no ib txwm ua rau tsim hluav taws xob, thiab tom qab ntawd degradation ntawm kev ua tau zoo hauv motors, generators, thiab sensors. Anti-eddy tam sim no technology ntawm hlau nplaum feem ntau suppresses tiam ntawm eddy tam sim no los yog suppresses lub zog ntawm induced tam sim no.
"Magnet Power" tau tsim los tiv thaiv eddy-tam sim no thev naus laus zis ntawm NdFeB thiab SmCo hlau nplaum.
Lub Eddy Currents
Eddy tam sim no yog tsim nyob rau hauv cov ntaub ntawv conductive uas yog nyob rau hauv ib tug alternating hluav taws xob teb los yog alternating magnetic teb. Raws li Faraday txoj cai, alternating magnetic teb tsim hluav taws xob, thiab vice versa. Hauv kev lag luam, txoj cai no yog siv rau hauv metallurgical melting. Los ntawm qhov nruab nrab zaus induction, cov khoom siv hluav taws xob hauv lub crucible, xws li Fe thiab lwm yam hlau, yog induced los ua kom sov, thiab thaum kawg cov khoom yog melted.
Lub resistivity ntawm NdFeB hlau nplaum, SmCo hlau nplaum los yog Alnico hlau nplaum yog ib txwm tsawg heev. Qhia hauv cov lus 1. Yog li ntawd, yog tias cov hlau nplaum no ua haujlwm hauv cov khoom siv hluav taws xob, kev sib cuam tshuam ntawm cov hlau nplaum thiab cov khoom siv hluav taws xob ua rau cov eddy tam sim no yooj yim heev.
Table1 Lub resistivity ntawm NdFeB hlau nplaum, SmCo hlau nplaum los yog Alnico hlau nplaum
| Magnets | Resistivity (mΩ·cm) |
| Alnico | 0.03-0.04 Nws |
| SmCo | 0.05-0.06 Nws |
| NdFeB | 0.09-0.10 Nws |
Raws li Lenz txoj cai, Eddy tam sim no tsim nyob rau hauv NdFeB thiab SmCo hlau nplaum, ua rau muaj ntau yam tsis zoo:
● Zog poob: Vim yog cov eddy tam sim no, ib feem ntawm lub zog sib nqus tau hloov mus rau hauv cov cua sov, txo cov kev ua haujlwm ntawm cov cuab yeej. Piv txwv li, cov hlau poob thiab tooj liab poob vim eddy tam sim no yog qhov tseem ceeb ntawm kev ua haujlwm ntawm cov motors. Hauv cov ntsiab lus ntawm kev txo cov pa roj carbon emissions, kev txhim kho kev ua haujlwm ntawm lub cev muaj zog yog qhov tseem ceeb heev.
● Thaum tshav kub kub tsim thiab Demagnetization: Ob lub NdFeB thiab SmCo hlau nplaum muaj lawv qhov siab tshaj plaws ua haujlwm kub, uas yog qhov tseem ceeb ntawm cov hlau nplaum ruaj khov. Cov cua sov uas tsim los ntawm eddy tam sim no poob ua rau qhov kub ntawm cov hlau nplaum nce. Thaum lub siab tshaj plaws kev khiav hauj lwm kub yog siab tshaj, demagnetization yuav tshwm sim, uas thaum kawg yuav ua rau ib tug txo nyob rau hauv lub functionality ntawm lub ntaus ntawv los yog cov teeb meem loj ua hauj lwm.
Tshwj xeeb tshaj yog tom qab txoj kev loj hlob ntawm high-ceev motors, xws li sib nqus bearing motors thiab cua bearing motors, qhov teeb meem demagnetization ntawm rotors tau dhau los ua qhov tseem ceeb. Daim duab 1 qhia tau hais tias lub rotor ntawm lub tshuab cua bearing nrog lub nrawm ntawm30,000RPM. Qhov kub thiab txias thaum kawg tau nce txog li500 ° C, ua rau demagnetization ntawm cov hlau nplaum.
Fig1. a thiab c yog daim duab magnetic teb thiab kev faib tawm ntawm ib txwm rotor, feem.
b thiab d yog daim duab magnetic teb thiab kev faib tawm ntawm demagnetized rotor, feem.
Tsis tas li ntawd, NdFeB hlau nplaum muaj qhov kub Curie qis (~ 320 ° C), uas ua rau lawv demagnetization. Lub curie kub ntawm SmCo hlau nplaum, yog li ntawm 750-820 ° C. NdFeB yooj yim dua los cuam tshuam los ntawm eddy tam sim no dua SmCo.
Anti-Eddy Current Technologies
Ntau txoj hauv kev tau tsim los txo cov eddy tam sim no hauv NdFeB thiab SmCo hlau nplaum. Cov thawj txoj kev no yog hloov cov muaj pes tsawg leeg thiab cov qauv ntawm cov hlau nplaum los txhim kho cov resistivity. Qhov thib ob txoj kev uas yog ib txwm siv nyob rau hauv engineering los cuam tshuam qhov tsim ntawm loj eddy tam sim no loops.
1.Txhim kho qhov resistivity ntawm hlau nplaum
Gabay et.al tau ntxiv CaF2, B2O3 rau SmCo hlau nplaum los txhim kho cov resistivity, uas wan enhanced los ntawm 130 μΩ cm mus rau 640 μΩ cm. Txawm li cas los xij, qhov (BH) max thiab Br poob qis heev.
2. Lamination ntawm Magnets
Laminating cov hlau nplaum, yog txoj hauv kev zoo tshaj plaws hauv engineering.
Cov hlau nplaum tau hlais rau hauv nyias txheej thiab tom qab ntawd glued ua ke. Lub interface ntawm ob daim hlau nplaum yog insulating kua nplaum. Txoj kev hluav taws xob rau cov eddy tam sim no cuam tshuam. Cov tshuab no yog siv dav hauv high-speed motors thiab generators. "Magnet Power" tau tsim ntau yam thev naus laus zis los txhim kho qhov kev tiv thaiv ntawm cov hlau nplaum. https://www.magnetpower-tech.com/high-electrical-impedance-eddy-current-series-product/
Thawj qhov tseem ceeb parameter yog qhov resistivity. Lub resistivity ntawm laminated NdFeB thiab SmCo hlau nplaum tsim los ntawm "Magnet Power" yog siab tshaj 2 MΩ·cm. Cov hlau nplaum no tuaj yeem cuam tshuam qhov cuam tshuam ntawm tam sim no hauv cov hlau nplaum thiab tom qab ntawd txo cov hluav taws kub.
Qhov thib ob parameter yog thickness ntawm cov kua nplaum ntawm daim hlau nplaum. Yog hais tias lub thickness ntawm cov nplaum txheej yog siab dhau lawm, nws yuav ua rau lub ntim ntawm cov hlau nplaum yuav txo, uas ua rau ib tug txo nyob rau hauv tag nrho cov hlau nplaum flux. "Magnet Power" tuaj yeem tsim cov hlau nplaum laminated nrog lub thickness ntawm cov nplaum txheej ntawm 0.05mm.
3. Txheej nrog High-Resistivity Materials
Insulating coatings yeej ib txwm siv rau saum npoo ntawm cov hlau nplaum los txhim kho qhov kev tiv thaiv ntawm cov hlau nplaum. Cov txheej txheem no ua raws li kev txwv, kom txo tau qhov ntws ntawm cov dej ntws tawm ntawm qhov chaw ntawm cov hlau nplaum. Xws li epoxy los yog parylene, ntawm ceramic coatings yeej ib txwm siv.
Cov txiaj ntsig ntawm Anti-Eddy Current Technology
Anti-eddy tam sim no thev naus laus zis yog qhov tseem ceeb siv hauv ntau daim ntawv thov nrog NdFeB thiab SmCo hlau nplaum. Xws li:
● High-speed motors: Nyob rau hauv high-ceev motors, uas txhais tau hais tias qhov ceev yog nyob nruab nrab ntawm 30,000-200,000RPM, kom suppress lub eddy tam sim no thiab txo cov cua sov yog qhov tseem ceeb yuav tsum tau. Daim duab 3 qhia qhov sib piv qhov kub thiab txias ntawm ib txwm SmCo hlau nplaum thiab anti-eddy tam sim no SmCo hauv 2600Hz. Thaum qhov kub ntawm ib txwm SmCo hlau nplaum (sab laug ib qho liab) tshaj 300 ℃, qhov kub ntawm cov hlau nplaum tiv thaiv tam sim no SmCo (txoj cai bule ib qho) tsis tshaj 150 ℃.
●MRI tshuab: Txo cov eddy tam sim no yog qhov tseem ceeb hauv MRI kom muaj kev ruaj ntseg ntawm cov tshuab.
Anti-eddy tam sim no thev naus laus zis tseem ceeb heev rau kev txhim kho kev ua haujlwm ntawm NdFeB thiab SmCo hlau nplaum hauv ntau daim ntawv thov. Los ntawm kev siv lamination, segmentation, thiab txheej thev naus laus zis, eddy tam sim no tuaj yeem txo qis hauv "Magnet Power". Lub anti-eddy tam sim no NdFeB thiab SmCo hlau nplaum yog ua tau rau siv nyob rau hauv niaj hnub electromagnetic systems.
Post lub sij hawm: Sep-23-2024
