{"id":1384,"date":"2024-11-07T05:08:16","date_gmt":"2024-11-07T05:08:16","guid":{"rendered":"https:\/\/nbaem.com\/?p=1384"},"modified":"2024-11-07T05:08:16","modified_gmt":"2024-11-07T05:08:16","slug":"nbaem-your-best-neodymium-magnet-supplier-from-china-5","status":"publish","type":"post","link":"https:\/\/nbaem.com\/ro\/nbaem-your-best-neodymium-magnet-supplier-from-china-5\/","title":{"rendered":"Cum afecteaz\u0103 temperatura performan\u021ba magnetului"},"content":{"rendered":"

Cum afecteaz\u0103 temperatura performan\u021ba magnetului<\/strong><\/h1><\/h1><\/div>

C\u00e2nd proiecta\u021bi aplica\u021bii cu magne\u021bi permanen\u021bi, trebuie s\u0103 \u0219ti\u021bi intervalul de temperatur\u0103 la care vor fi expu\u0219i magne\u021bii. Schimb\u0103rile de temperatur\u0103 afecteaz\u0103 c\u00e2t de puternic este magnetul \u0219i c\u00e2t de bine func\u021bioneaz\u0103. Dac\u0103 nu \u00een\u021belege\u021bi acest lucru, ve\u021bi ob\u021bine ceva care nu func\u021bioneaz\u0103 la nivelul dorit. A\u0219adar, trebuie s\u0103 \u0219ti\u021bi cum se comport\u0103 diferitele materiale magnetice \u00een raport cu temperatura.<\/p>\n

Toate materialele magnetice vor avea o schimbare a densit\u0103\u021bii fluxului pe m\u0103sur\u0103 ce temperatura variaz\u0103. \u00cen general, magne\u021bii devin mai puternici pe m\u0103sur\u0103 ce temperatura scade, cu excep\u021bia magne\u021bilor ferritici. To\u021bi magne\u021bii permanen\u021bi \u00ee\u0219i pierd o parte din performan\u021b\u0103 pe m\u0103sur\u0103 ce temperatura cre\u0219te. \u00centrebarea este: \u201e\u00cemi rec\u00e2\u0219tig performan\u021ba c\u00e2nd temperatura se r\u0103ce\u0219te?\u201d Asta depinde de tipul materialului magnetic \u0219i de temperatura maxim\u0103 pentru care este proiectat s\u0103 func\u021bioneze.<\/p>\n

Exist\u0103 trei tipuri de pierdere a performan\u021bei magnetice pe care le pute\u021bi experimenta ca rezultat al temperaturii:<\/p>\n

    \n
  1. Pierdere reversibil\u0103: <\/strong>Acest lucru se \u00eent\u00e2mpl\u0103 atunci c\u00e2nd temperatura magnetului cre\u0219te peste mediul ambiant, dar nu dep\u0103\u0219e\u0219te ratingul s\u0103u maxim de temperatur\u0103. C\u00e2nd magnetul se r\u0103ce\u0219te, recupera\u021bi toat\u0103 performan\u021ba.<\/li>\n
  2. Pierderea irevocabil\u0103: <\/strong>C\u00e2nd magnetul trece peste ratingul s\u0103u maxim de temperatur\u0103, dar nu trece peste temperatura Curie, pierde\u021bi pu\u021bin din performan\u021b\u0103. C\u00e2nd se r\u0103ce\u0219te, rec\u00e2\u0219tiga\u021bi o parte din performan\u021b\u0103, dar nu o ve\u021bi recupera niciodat\u0103 pe toat\u0103, dec\u00e2t dac\u0103 re-magnetiza\u021bi magnetul, ceea ce, de obicei, nu este rentabil.<\/li>\n
  3. Pierderea permanent\u0103:<\/strong> C\u00e2nd magnetul trece peste temperatura Curie, domeniile magnetice din magnet \u00ee\u0219i schimb\u0103 structura, iar acea deteriorare este permanent\u0103. Nu pute\u021bi recupera acea performan\u021b\u0103 prin re-magnetizare.<\/li>\n<\/ol>\n

    \u00cen timp ce fi\u0219ele tehnice ale magne\u021bilor includ adesea temperatura Curie, aceasta nu este o cifr\u0103 util\u0103 pentru proiectarea practic\u0103. Nu ar trebui s\u0103 opera\u021bi nic\u0103ieri \u00een apropierea temperaturii Curie. Trebuie s\u0103 cunoa\u0219te\u021bi temperatura maxim\u0103 de operare.<\/p>\n<\/div><\/div><\/div><\/div><\/div>

    Cum afecteaz\u0103 temperatura magne\u021bii de neodimiu<\/strong><\/span><\/h1><\/h2><\/div>

    Magneti de neodiam<\/span> <\/a>sunt cunoscu\u021bi pentru rezisten\u021ba magnetic\u0103 ridicat\u0103 la temperatura camerei. Dac\u0103 \u00eei \u00eenc\u0103lzi\u021bi, performan\u021ba lor scade, chiar dac\u0103 nu ajunge\u021bi la temperatura lor maxim\u0103. Pentru fiecare grad Celsius de cre\u0219tere a temperaturii peste mediul ambiant, pierde\u021bi \u00eentre 0,08% \u0219i 0,12% din puterea magnetului.<\/p>\n

    Magne\u021bii standard din neodimiu au un rating maxim de temperatur\u0103 de 80\u00b0C. Exist\u0103 grade de \u00eenalt\u0103 temperatur\u0103 pe care le pute\u021bi utiliza p\u00e2n\u0103 la 150\u00b0C, dar peste acel prag este mai bine s\u0103 utiliza\u021bi un magnet din samariu-cobalt, deoarece va avea mai mult\u0103 putere. Dac\u0103 sc\u0103de\u021bi sub -138\u00b0C, magnetismul \u00een magnetul de neodimiu se modific\u0103, iar pierde\u021bi \u00eentre 10% \u0219i 20% din performan\u021ba magnetului.<\/p>\n<\/div><\/div><\/div><\/div><\/div>

    Cum afecteaz\u0103 temperatura magne\u021bii de samariu-cobalt<\/strong><\/span><\/h1><\/h2><\/div>

    Magne\u021bi din samariu-cobalt<\/span> <\/a>nu sunt la fel de puternice ca magne\u021bii din neodimit la temperatura camerei, dar au o stabilitate termic\u0103 mai bun\u0103. Magne\u021bii din neodim \u00eencep s\u0103 \u00ee\u0219i piard\u0103 mult din putere peste 150\u00b0C. Magneii de cobalt de amium (samarium cobalt) pot rezista p\u00e2n\u0103 la 350\u00b0C \u00eenainte s\u0103 \u00eenceap\u0103 s\u0103 piard\u0103 puterea pe care nu o vei recupera c\u00e2nd se r\u0103cesc. De aceea folose\u0219ti magne\u021bi din samariu-cobalt \u00een aplica\u021bii la temperaturi \u00eenalte unde ai nevoie de rezisten\u021ba termic\u0103.<\/p>\n<\/div><\/div><\/div><\/div><\/div>

    Cum afecteaz\u0103 temperatura magne\u021bii din aliaje de fier-aliniu-nichel (Alnico)<\/strong><\/span><\/h1><\/h2><\/div>

    magne\u021bi Alnico<\/span><\/a> sunt ceilal\u021bi magne\u021bi cei mai puternici dup\u0103 magne\u021bii din neodim. Ei au o remanen\u021b\u0103 mare \u0219i o coercivitate sc\u0103zut\u0103. N praktikii nega\u021bi magne\u021bii Alnico au rezisten\u021ba lor la demagnetizare. Nu le plac c\u00e2mpuri magnetice externe sau \u0219ocuri fizice. Dar magne\u021bii Alnico au o stabilitate termic\u0103 excelent\u0103. Pentru fiecare grad Celsius \u00een plus \u00een temperatur\u0103, pierde\u021bi 0,02% din puterea magnetului. Pute\u021bi folosi magne\u021bi Alnico p\u00e2n\u0103 la 525\u00b0C (977\u00b0F) f\u0103r\u0103 a provoca daune permanente.<\/p>\n<\/div><\/div><\/div><\/div><\/div>

    Cum afecteaz\u0103 temperatura magne\u021bii Ferrit<\/strong><\/span><\/h1><\/h2><\/div>

    Magneti de ferrita<\/span><\/a> sunt diferi\u021bi de ceilal\u021bi magne\u021bi. Pe m\u0103sur\u0103 ce temperatura cre\u0219te, rezisten\u021ba lor la demagnetizare devine mai bun\u0103. Pentru fiecare grad Celsius \u00een cre\u0219tere, pierde\u021bi 0,2% din puterea magnetului. Pute\u021bi folosi magne\u021bi ferrit p\u00e2n\u0103 la 180\u00b0C \u00eenainte s\u0103 \u00eenregistreze o sc\u0103dere a puterii care nu se va \u00eentoarce. De aceea \u00eei vezi folosi\u021bi \u00een motoare \u0219i generatoare.<\/p>\n

    .<\/span><\/p>\n<\/div><\/div><\/div><\/div><\/div>

    C\u00e2nd proiecta\u021bi cu magne\u021bi, trebuie s\u0103 \u0219ti\u021bi intervalul de temperatur\u0103 la care vor fi expu\u0219i magne\u021bii. Dac\u0103 nu \u00een\u021belege\u021bi cum vor r\u0103spunde magne\u021bii pe care \u00eei utiliza\u021bi la temperatur\u0103, nu ve\u021bi ob\u021bine performan\u021ba dorit\u0103.<\/p>\n

    Magne\u021bii din neodim sunt magne\u021bi puternici, dar nu le place c\u0103ldura. Magne\u021bii din cobalt de samariu nu sunt la fel de puternici ca magne\u021bii din neodim, dar sunt mai stabili la temperaturi \u00eenalte. Magne\u021bii Alnico pot suporta c\u0103ldura. Magne\u021bii Ferrit se descurc\u0103 bine la temperaturi ridicate \u0219i, pe m\u0103sur\u0103 ce se \u00eenc\u0103lzesc, devin mai rezisten\u021bi la demagnetizare.<\/p>\n

    \u00cen\u021beleg\u00e2nd mediul \u00een care va opera aplica\u021bia dvs. \u0219i aleg\u00e2nd materialul magnetic potrivit, pute\u021bi asigura c\u0103 aplica\u021bia dvs. va func\u021biona a\u0219a cum dori\u021bi pentru mult timp. s\u0103 ne contacta\u021bi<\/span><\/a> pentru a ob\u021bine mai multe informa\u021bii despre magneti.<\/p>\n<\/div><\/div><\/div><\/div><\/div><\/p>","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1384","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/nbaem.com\/ro\/wp-json\/wp\/v2\/posts\/1384","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nbaem.com\/ro\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nbaem.com\/ro\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nbaem.com\/ro\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nbaem.com\/ro\/wp-json\/wp\/v2\/comments?post=1384"}],"version-history":[{"count":2,"href":"https:\/\/nbaem.com\/ro\/wp-json\/wp\/v2\/posts\/1384\/revisions"}],"predecessor-version":[{"id":1386,"href":"https:\/\/nbaem.com\/ro\/wp-json\/wp\/v2\/posts\/1384\/revisions\/1386"}],"wp:attachment":[{"href":"https:\/\/nbaem.com\/ro\/wp-json\/wp\/v2\/media?parent=1384"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nbaem.com\/ro\/wp-json\/wp\/v2\/categories?post=1384"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nbaem.com\/ro\/wp-json\/wp\/v2\/tags?post=1384"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}