Kwanan nan, yayin da fasaha ke haɓaka zuwa babban mita da babban sauri, asarar abubuwan maganadisu na yanzu ya zama babbar matsala. Musamman maNeodymium Iron Boron(NdFeB) da kumaSamarium Cobalt(SmCo) maganadiso, ana samun sauƙin shafar yanayin zafi. Asara a halin yanzu ta zama babbar matsala.
Wadannan igiyoyin igiyar ruwa koyaushe suna haifar da haɓakar zafi, sannan kuma lalata aikin injina, janareta, da na'urori masu auna firikwensin. Anti-eddy halin yanzu fasahar maganadiso yawanci yana danne ƙera eddy current ko kuma yana danne motsin halin yanzu.
"Magnet Power" an haɓaka fasahar Anti-eddy-current fasahar NdFeB da SmCo maganadiso.
Eddy Currents
Ana haifar da igiyoyin Eddy a cikin kayan aiki waɗanda ke cikin madadin wutar lantarki ko filin maganadisu. A cewar dokar Faraday, madaidaicin filayen maganadisu na samar da wutar lantarki, kuma akasin haka. A cikin masana'antu, ana amfani da wannan ka'ida a cikin narkewar ƙarfe. Ta hanyar shigar da matsakaici-mita, kayan sarrafawa a cikin crucible, irin su Fe da sauran karafa, ana haifar da su don samar da zafi, kuma a ƙarshe an narkar da kayan aiki mai ƙarfi.
A resistivity na NdFeB maganadiso, SmCo maganadiso ko Alnico maganadiso ne ko da yaushe sosai low. An nuna a cikin tebur 1. Saboda haka, idan waɗannan magneto suna aiki a cikin na'urorin lantarki, hulɗar da ke tsakanin motsin maganadisu da abubuwan gudanarwa suna haifar da igiyoyin ruwa cikin sauƙi.
Table1 A resistivity na NdFeB maganadiso, SmCo maganadiso ko Alnico maganadiso
| Magnets | Rrashin hankali (mΩ·cm) |
| Alnico | 0.03-0.04 |
| SmCo | 0.05-0.06 |
| NdFeB | 0.09-0.10 |
A cewar Lenz's Law, Eddy igiyoyin da aka samar a cikin NdFeB da SmCo maganadiso, yana haifar da abubuwa da yawa waɗanda ba a so:
● Rashin Makamashi: Saboda magudanar ruwa, wani ɓangare na makamashin maganadisu yana canzawa zuwa zafi, yana rage ingancin na'urar. Misali, asarar ƙarfe da tagulla da tagulla da ke haifar da eddy current shine babban abin da ke haifar da ingantaccen injin. A cikin mahallin rage fitar da iskar carbon, inganta ingancin injina yana da mahimmanci.
● Heating Tsabta da Demagnetization: Duka NdFeB da SmCo maganadiso suna da matsakaicin zafin jiki na aiki, wanda shine mahimmin siga na maganadisu na dindindin. Zafin da ke haifar da asarar eddy a halin yanzu yana haifar da yawan zafin jiki na maganadisu. Da zarar matsakaicin zafin aiki ya wuce, demagnetization zai faru, wanda a ƙarshe zai haifar da raguwar aikin na'urar ko matsalolin aiki mai tsanani.
Musamman bayan haɓaka manyan injina masu saurin gaske, irin su injinan maganadisu da na'urori masu ɗaukar iska, matsalar lalata injin rotors ta zama mafi shahara. Hoto na 1 yana nuna jujjuyawar injin da ke ɗauke da iska tare da saurin30,000RPM A ƙarshe yanayin zafi ya tashi da kusan500°C, sakamakon demagnetization na maganadiso.
Hoto 1. a da c shine zanen filin maganadisu da rarraba na'ura mai juyi na yau da kullun, bi da bi.
b da d shine zane-zanen filin maganadisu da rarraba na'ura mai jujjuyawar demagnetized, bi da bi.
Bugu da ƙari kuma, NdFeB maganadiso suna da ƙananan zafin jiki na Curie (~ 320 ° C), wanda ke sa su lalata. Yanayin zafi na SmCo maganadiso, yana tsakanin 750-820°C. NdFeB ya fi sauƙi da eddy current ya shafa fiye da SmCo.
Anti-Eddy Current Technologies
An ƙirƙiri hanyoyi da yawa don rage magudanar ruwa a cikin NdFeB da maganadisu na SmCo. Wannan hanya ta farko ita ce canza abun da ke ciki da tsarin maganadisu don haɓaka juriya. Hanya ta biyu wacce ko da yaushe ake amfani da ita a aikin injiniya don tarwatsa samuwar manyan madaukai na yanzu.
1.Enhance da resistivity na maganadiso
Gabay et.al an ƙara CaF2, B2O3 zuwa SmCo maganadiso don inganta resistivity, wanda wan inganta daga 130 μΩ cm zuwa 640 μΩ cm. Koyaya, (BH) max da Br sun ragu sosai.
2. Lamination na Magnets
Laminating da maganadiso, ita ce hanya mafi inganci a aikin injiniya.
An yayyanka abubuwan maganadisu zuwa siraran sirara sannan a haɗa su tare. Haɗin kai tsakanin guda biyu na maganadiso shine insulating manne. Hanyar lantarki don magudanar ruwa ta lalace. Ana amfani da wannan fasaha sosai a cikin injina masu sauri da kuma janareta. "Magnet Power" an haɓaka fasaha da yawa don inganta juriya na maganadisu. https://www.magnetpower-tech.com/high-electrical-impedance-eddy-current-series-product/
Ma'auni na farko mai mahimmanci shine tsayayya. Resistance na laminated NdFeB da SmCo maganadiso da "Magnet Power" samar ya fi 2 MΩ · cm. Wadannan maganadiso suna iya hana gudanar da halin yanzu a cikin maganadisu sannan su danne yanayin zafi.
Siga na biyu shine kauri na manne tsakanin guda na maganadiso. Idan kauri na mannen ya yi girma sosai, zai sa ƙarar maganadisu ya ragu, wanda zai haifar da raguwar juzu'in maganadisu gabaɗaya. "Magnet Power" na iya samar da laminated maganadiso tare da kauri na manne Layer na 0.05mm.
3. Rufewa tare da Kayayyakin Juriya
A koyaushe ana amfani da suturar insulating akan saman maganadisu don haɓaka juriya na maganadisu. Waɗannan rufin suna aiki azaman shinge, don rage kwararar igiyoyin ruwa akan saman maganadisu. Irin su epoxy ko parylene, na yumbu mai rufi ana amfani dashi koyaushe.
Fa'idodin Fasahar Anti-Eddy na Yanzu
Fasahar anti-eddy na yanzu yana da mahimmanci a yi amfani da shi a yawancin aikace-aikace tare da NdFeB da maganadiso SmCo. Ciki har da:
● High-gudun Motors: A cikin manyan motoci masu sauri, wanda ke nufin gudun yana tsakanin 30,000-200,000RPM, don danne eddy current kuma don rage zafi shine mabuɗin da ake bukata. Hoto na 3 yana nuna yanayin yanayin kwatanta na al'ada SmCo magnet da anti-eddy halin yanzu SmCo a 2600Hz. Lokacin da zazzabi na al'ada SmCo maganadiso (hagu ja daya) ya wuce 300 ℃, zafin anti-eddy halin yanzu SmCo maganadiso (dama bule daya) ba ya wuce 150 ℃.
●Injin MRI: Rage raƙuman ruwa yana da mahimmanci a cikin MRI don kula da kwanciyar hankali na tsarin.
Fasaha na yanzu na Anti-eddy yana da matukar mahimmanci don haɓaka aikin NdFeB da maganadisu na SmCo a aikace-aikace da yawa. Ta amfani da lamination, rarrabuwa, da fasaha na sutura, za a iya rage yawan igiyoyin ruwa a cikin "Ikon Magnet". Ana iya amfani da maganadisu na anti-eddy na yanzu NdFeB da SmCo a cikin tsarin lantarki na zamani.
Lokacin aikawa: Satumba-23-2024
