{"id":21183,"date":"2017-11-27T08:49:09","date_gmt":"2017-11-27T01:49:09","guid":{"rendered":"https:\/\/banbientan.com\/?p=21183"},"modified":"2017-11-27T08:49:09","modified_gmt":"2017-11-27T01:49:09","slug":"cach-tinh-dien-tro-xa-cho-bien-tan","status":"publish","type":"post","link":"https:\/\/hunglong.banbientan.com\/?p=21183","title":{"rendered":"C\u00e1ch t\u00ednh \u0111i\u1ec7n tr\u1edf x\u1ea3 cho bi\u1ebfn t\u1ea7n"},"content":{"rendered":"
    \n
  1. B\u1ea3ng tham kh\u1ea3o th\u00f4ng s\u1ed1 l\u1ef1a ch\u1ecdn \u0111i\u1ec7n tr\u1edf cho bi\u1ebfn t\u1ea7n.<\/strong><\/li>\n<\/ol>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Lo\u1ea1i bi\u1ebfn t\u1ea7n 3 pha 380V<\/strong><\/span><\/td>\n<\/tr>\n
    C\u00f4ng su\u1ea5t bi\u1ebfn t\u1ea7n<\/strong><\/td>\n\u0110i\u1ec7n tr\u1edf<\/strong><\/td>\nC\u00f4ng su\u1ea5t \u0111i\u1ec7n tr\u1edf<\/strong><\/td>\nS\u1ed1 l\u01b0\u1ee3ng<\/strong><\/td>\n<\/tr>\n
    0,75 kW<\/td>\n400\u03a9<\/td>\n260W<\/td>\n1<\/td>\n<\/tr>\n
    1,5\u00a0 kW<\/td>\n400\u03a9<\/td>\n390W<\/td>\n1<\/td>\n<\/tr>\n
    2,2 kW<\/td>\n150\u03a9<\/td>\n390W<\/td>\n1<\/td>\n<\/tr>\n
    4\/5.5 kW<\/td>\n150\u03a9<\/td>\n520W<\/td>\n1<\/td>\n<\/tr>\n
    5.5\/7.5 kW<\/td>\n100\u03a9<\/td>\n1040W<\/td>\n1<\/td>\n<\/tr>\n
    7.5\/11 kW<\/td>\n50\u03a9<\/td>\n1040W<\/td>\n1<\/td>\n<\/tr>\n
    11\/15 kW<\/td>\n50\u03a9<\/td>\n1040W<\/td>\n1<\/td>\n<\/tr>\n
    15\/18.5 kW<\/td>\n40\u03a9<\/td>\n1560W<\/td>\n1<\/td>\n<\/tr>\n
    Lo\u1ea1i bi\u1ebfn t\u1ea7n 3pha 220V<\/span><\/strong><\/td>\n<\/tr>\n
    1,5 kW<\/td>\n130\u03a9<\/td>\n260W<\/td>\n1<\/td>\n<\/tr>\n
    2,2 kW<\/td>\n80\u03a9<\/td>\n260W<\/td>\n1<\/td>\n<\/tr>\n
    4 kW<\/td>\n50\u03a9<\/td>\n400W<\/td>\n1<\/td>\n<\/tr>\n
    5.5 kW<\/td>\n35\u03a9<\/td>\n550W<\/td>\n1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    C\u00e1c lo\u1ea1i bi\u1ebfn t\u1ea7n c\u00f3 c\u00f4ng su\u1ea5t cao h\u01a1n vui\u00a0 l\u00f2ng li\u00ean h\u1ec7 Mr Long 0948956835 \u0111\u1ec3 \u0111\u01b0\u1ee3c t\u01b0 v\u1ea5n.
    \n2. C\u00e1ch t\u00ednh to\u00e1n gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf, c\u00f4ng su\u1ea5t tr\u1edf khi ph\u1ea3i m\u1eafc n\u1ed1i ti\u1ebfp ho\u1eb7c song song nhi\u1ec1u \u0111i\u1ec7n tr\u1edf (C\u00e1c \u0111i\u1ec7n tr\u1edf c\u00f3 gi\u00e1 tr\u1ecb b\u1eb1ng nhau):<\/strong>
    \n* V\u1edbi tr\u01b0\u1eddng h\u1ee3p l\u1eafp song song nhi\u1ec1u \u0111i\u1ec7n tr\u1edf:<\/em><\/strong>
    \n– C\u00f4ng su\u1ea5t t\u1ed5ng = T\u1ed5ng c\u00f4ng su\u1ea5t c\u00e1c \u0111i\u1ec7n tr\u1edf\u00a0( PT\u1ed5ng<\/sub>\u00a0= P1<\/sub>\u00a0+ P2<\/sub>\u00a0+ … + Pn<\/sub>\u00a0).<\/strong>
    \n– \u0110i\u1ec7n tr\u1edf t\u1ed5ng = Gi\u00e1 tr\u1ecb 1 \u0111i\u1ec7n tr\u1edf \/ T\u1ed5ng s\u1ed1 \u0111i\u1ec7n tr\u1edf\u00a0( RT\u1ed5ng<\/sub>\u00a0= R \/ n ).<\/strong>
    \n* V\u1edbi tr\u01b0\u1eddng h\u1ee3p l\u1eafp n\u1ed1i ti\u1ebfp nhi\u1ec1u \u0111i\u1ec7n tr\u1edf:<\/em><\/strong>
    \n– C\u00f4ng su\u1ea5t t\u1ed5ng = T\u1ed5ng c\u00f4ng su\u1ea5t c\u00e1c \u0111i\u1ec7n tr\u1edf\u00a0( PT\u1ed5ng<\/sub>\u00a0= P1<\/sub>\u00a0+ P2<\/sub>\u00a0+ … + Pn<\/sub>\u00a0).<\/strong>
    \n– \u0110i\u1ec7n tr\u1edf t\u1ed5ng = T\u1ed5ng c\u00f4ng su\u1ea5t c\u00e1c \u0111i\u1ec7n tr\u1edf\u00a0( RT\u1ed5ng<\/sub>\u00a0= R1<\/sub>\u00a0+ R2<\/sub>\u00a0+ … + Rn<\/sub>\u00a0).<\/strong>
    \nTrong \u0111\u00f3:\u00a0<\/u>
    \n+\u00a0PT\u1ed5ng<\/sub>: C\u00f4ng su\u1ea5t t\u1ed5ng.
    \n+ RT\u1ed5ng<\/sub>: \u0110i\u1ec7n tr\u1edf t\u1ed5ng.
    \n+ n: T\u1ed5ng s\u1ed1 \u0111i\u1ec7n tr\u1edf \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng.
    \nCh\u1ecdn \u0111i\u1ec7n tr\u1edf x\u1ea3 c\u0103n c\u1ee9 v\u00e0o 2 y\u1ebfu t\u1ed1 sau:<\/strong>
    \n1, Ch\u1ecdn c\u00f4ng su\u1ea5t \u0111i\u1ec7n tr\u1edf x\u1ea3 (W):<\/strong>\u00a0C\u00f4ng su\u1ea5t \u0111i\u1ec7n tr\u1edf \u0111\u01b0\u1ee3c ch\u1ecdn ph\u1ea3i \u0111\u1ea3m b\u1ea3o t\u00ednh n\u0103ng k\u1ef9 thu\u1eadt v\u00e0\u00a0\u00a0kinh t\u1ebf. V\u00ec v\u1eady khi bi\u1ebfn t\u1ea7n x\u1ea3 nhi\u1ec1u \u0111i\u1ec7n th\u00ec ta ch\u1ecdn c\u00f4ng su\u1ea5t l\u1edbn ng\u01b0\u1ee3c l\u1ea1i khi bi\u1ebfn t\u1ea7n x\u1ea3 \u00edt th\u00ec ch\u1ecdn c\u00f4ng su\u1ea5t nh\u1ecf \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o v\u1ea5n \u0111\u1ec1 kinh t\u1ebf.
    \nBi\u1ebfn t\u1ea7n x\u1ea3 nhi\u1ec1u hay \u00edt th\u00ec ph\u1ee5 thu\u1ed9c v\u00e0o t\u1ea3i c\u1ee7a m\u1ed7i \u1ee9ng d\u1ee5ng. V\u00ed d\u1ee5 v\u1edbi t\u1ea3i n\u00e2ng h\u1ea1 c\u1ea7u tr\u1ee5c, v\u1eadn th\u0103ng…\u00a0( t\u1ea3i th\u1ebf n\u0103ng) \u0111\u1ed9ng c\u01a1\u00a0s\u1ebd l\u00e0m vi\u1ec7c nh\u01b0 m\u1ed9t m\u00e1y ph\u00e1t \u0111i\u1ec7n khi h\u1ea1 t\u1ea3i v\u00e0 khi h\u00e3m th\u1eddi gian h\u1ea1 t\u1ea3i l\u00e2u n\u00ean c\u1ea7n ch\u1ecdn c\u00f4ng su\u1ea5t l\u1edbn (1\/2 ho\u1eb7c 2\/3 c\u00f4ng su\u1ea5t \u0111\u1ed9ng c\u01a1). Ho\u1eb7c t\u1ea3i c\u00f3 qu\u00e1n\u00a0t\u00ednh l\u1edbn th\u1eddi gian h\u00e3m d\u00e0i v\u00ed d\u1ee5 m\u00e1y quay li t\u00e2m, m\u00e1y v\u1eaft, m\u00e1y b\u1ec7n nhi\u1ec1u l\u00f4, c\u00e1c m\u00e1y truy\u1ec1n \u0111\u1ed9ng c\u00f3 b\u00e1nh \u0111\u00e0 … Th\u00ec c\u1ea7n ch\u1ecdn \u0111i\u1ec7n tr\u1edf c\u00f3 c\u00f4ng su\u1ea5t l\u1edbn. Ng\u01b0\u1ee3c l\u1ea1i th\u00ec ch\u1ecdn \u0111i\u1ec7n tr\u1edf c\u00f3 c\u00f4ng su\u1ea5t nh\u1ecf.
    \n2, Ch\u1ecdn gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf (Ohm):\u00a0<\/strong>Gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh b\u1edfi thi\u1ebft k\u1ebf d\u00f2ng h\u00e3m c\u1ee7a t\u1eebng lo\u1ea1i bi\u1ebfn t\u1ea7n v\u00e0 t\u1eebng\u00a0h\u00e3ng bi\u1ebfn t\u1ea7n. Th\u00f4ng s\u1ed1\u00a0n\u00e0y \u0111\u1ecdc trong t\u1ea1i li\u1ec7u c\u00e1c h\u00e3ng bi\u1ebfn t\u1ea7n \u0111\u1ec1u c\u00f3 b\u1ea3ng\u00a0tra. C\u00e1c h\u00e3ng bi\u1ebfn t\u1ea7n \u0111\u1ec1u \u0111\u01b0a ra gi\u00e1 tr\u1ecb min c\u1ee7a \u0111i\u1ec7n tr\u1edf ( t\u1ee9c l\u00e0 li\u00ean quan\u00a0d\u00f2ng h\u00e3m max c\u1ee7a bi\u1ebfn t\u1ea7n ). V\u00ec v\u1eady ch\u1ecdn gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf ph\u1ea3i l\u1edbn h\u01a1n ho\u1eb7c b\u1eb1ng gi\u00e1 tr\u1ecb min c\u1ee7a b\u1ea3ng tra. Th\u00f4ng th\u01b0\u1eddng c\u00e1c h\u00e3ng bi\u1ebfn t\u1ea7n \u0111\u1ec1u \u0111i\u1ec1u khi\u1ec3n x\u1ea3 b\u1eb3ng nguy\u00ean l\u00fd PWM n\u00ean gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf c\u00f3 th\u1ec3 ch\u1ecdn b\u1eb1ng 1,5 \u0111\u1ebfn 2 l\u1ea7n gi\u00e1 tr\u1ecb min c\u1ee7a bi\u1ebfn t\u1ea7n th\u00ec\u00a0v\u1eabn lu\u00f4n lu\u00f4n \u0111\u1ea3m b\u1ea3m b\u1ea3o cho qu\u00e1 tr\u00ecnh h\u00e3m. \u0110\u1ed1i v\u1edbi bi\u1ebfn t\u1ea7n x\u1ea3 \u00edt c\u00f3 th\u1ec3 ch\u1ecdn gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf cao h\u01a1n. ( Theo kinh nghi\u1ec7m c\u1ee7a ch\u00fang t\u00f4i th\u00ec kh\u00f4ng c\u00f3 h\u00e3ng s\u1ea3n xu\u1ea5t bi\u1ebfn t\u1ea7n n\u00e0o ghi trong t\u00e0i li\u1ec7u th\u00f4ng s\u1ed1 \u0111i\u1ec7n tr\u1edf (Ohm) Max.) V\u00ec v\u1eady ch\u00fang ta kh\u00f4ng c\u1ea7n thi\u1ebft ph\u1ea3i ch\u1ecdn ch\u00ednh x\u00e1c gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf m\u1ed9t c\u00e1ch m\u00e1y m\u00f3c).
    \nNguy\u00ean nh\u00e2n pha\u0309i du\u0300ng \u0111i\u00ea\u0323n tr\u01a1\u0309 xa\u0309<\/b>
    \n– Khi \u0111\u1ed9ng\u00a0c\u01a1 l\u00e0m vi\u1ec7c \u1edf ch\u1ebf \u0111\u1ed9 h\u00e3m ( h\u00e3m \u0111\u1ed9ng n\u0103ng, h\u00e3m t\u00e1i sinh) th\u00ec \u0111\u1ed9ng c\u01a1 s\u1ebd tr\u1edf th\u00e0nh\u00a0m\u00e1y ph\u00e1t \u0111i\u1ec7n.\u00a0\u00a0N\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n n\u00e0y s\u1ebd\u00a0kh\u00f4ng \u0111\u01b0a \u0111\u01b0\u1ee3c v\u1ec1 l\u01b0\u1edbi \u0111i\u1ec7n do bi\u1ec1n t\u1ea7n c\u00f3 b\u1ed9 ch\u1ec9nh l\u01b0u. V\u00ec v\u1eady \u0111i\u1ec7n \u00e1p DC Bus\u00a0c\u1ee7a bi\u1ebfn t\u1ea7n s\u1ebd t\u0103ng cao\u00a0h\u01a1n m\u1ee9c cho ph\u00e9p. N\u1ebfu DC t\u0103ng qu\u00e1 cao bi\u1ebfn t\u1ea7n s\u1ebd b\u00e1o l\u1ed7i ho\u1eb7c l\u00e0m h\u1ecfng linh li\u1ec7n, \u0111\u1ed9ng c\u01a1 kh\u00f4ng h\u00e3m \u0111\u01b0\u1ee3c.\u00a0\u00a0\u0110\u1ec3 \u0111i\u1ec7n \u00e1p DC kh\u00f4ng l\u00ean cao th\u00ec c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t bi\u1ebfn t\u1ea7n c\u00f3 l\u1eafp th\u00eam b\u1ed9 h\u00e3m. ( B\u1ed9 h\u00e3m c\u00f3 th\u1ec3 l\u1eafp trong bi\u1ebfn t\u1ea7n ho\u1eb7c b\u00ean ngo\u00e0i bi\u1ebfn t\u1ea7n). B\u1ed9 h\u00e3m c\u00f3 t\u00e1c d\u1ee5ng \u0111\u01b0a \u0111i\u1ec7n DC ra \u0111i\u1ec7n tr\u1edf nh\u1eb1m m\u1ee5c \u0111\u00edch \u1ed5n \u00e1p DC Bus.
    \n-Ta t\u01b0\u1edfng t\u01b0\u1ee3ng \u0111i\u1ec7n tr\u1edf x\u1ea3 ch\u00ednh l\u00e0 c\u00e1i ph\u1ee5 t\u1ea3i.\u00a0Khi \u0111i\u1ec7n \u00e1p tr\u00ean bus DC c\u1ee7a bi\u1ebfn t\u1ea7n l\u00ean\u00a0cao th\u00ec bi\u1ebfn t\u1ea7n s\u1ebd c\u1ea5p \u0111i\u1ec7n ra\u00a0\u0111i\u1ec7n tr\u1edf. V\u00ec v\u1eady n\u1ebfu ta ch\u1ecdn th\u00f4ng s\u1ed1\u00a0\u0111i\u1ec7n tr\u1edf ( Ohm ) qu\u00e1 l\u1edbn th\u00ec bi\u1ebfn t\u1ea7n x\u1ea3 ch\u1eadm m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p x\u1ea3 kh\u00f4ng h\u1ebft th\u00ec bi\u1ebfn t\u1ea7n\u00a0v\u1eabn c\u00f2n b\u00e1o l\u1ed7i, ho\u1eb7c c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn thi\u1ebft b\u1ecb v\u00e0 tu\u1ed5i th\u1ecd c\u1ee7a n\u00f3, n\u1ebfu ch\u1ecdn (Ohm ) \u0111i\u1ec7n tr\u1edf qu\u00e1 nh\u1ecf x\u1ea3 qu\u00e1 nhanh g\u00e2y ra t\u00ecnh tr\u1ea1ng qu\u00e1 d\u00f2ng h\u00e3m c\u1ee7a bi\u1ebfn t\u1ea7n g\u00e2y ch\u00e1y n\u1ed5 bi\u1ebfn t\u1ea7n sau \u0111\u00f3 ch\u00e1y\u00a0\u0111i\u1ec7n tr\u1edf x\u1ea3. Khi ch\u1ecdn c\u00f4ng su\u1ea5t ( W ) c\u1ee7a \u0111i\u1ec7n tr\u1edf qu\u00e1 nh\u1ecf kh\u00f4ng \u0111\u1ee7 c\u00f4ng su\u1ea5t x\u1ea3 th\u00ec \u0111i\u1ec7n tr\u1edf s\u1ebd qu\u00e1 t\u1ea3i, qu\u00e1 nhi\u1ec7t \u0111i\u1ec7n tr\u1edf v\u00e0 \u00a0\u0111i\u1ec7n tr\u1edf s\u1ebd ch\u00e1y. V\u00ec v\u1eady vi\u1ec7c l\u1ef1a ch\u1ecdn \u0111i\u1ec7n tr\u1edf x\u1ea3 ph\u1ee5 thu\u1ed9c v\u00e0o nhi\u1ec1u y\u1ebfu t\u1ed1 nh\u01b0: c\u00f4ng su\u1ea5t c\u1ee7a \u0111\u1ed9ng c\u01a1, t\u1ea3i c\u1ee7a \u0111\u1ed9ng c\u01a1, h\u00e3ng bi\u1ebfn t\u1ea7n…. khi l\u1ef1a ch\u1ecdn \u0111i\u1ec7n tr\u1edf x\u1ea3 th\u00ec c\u1ea7n xem x\u00e9t c\u00e1c y\u1ebfu t\u1ed1 tr\u00ean v\u00e0 tu\u00e2n\u00a0theo ch\u1ec9 d\u1eabn c\u1ee7a nh\u00e0\u00a0s\u1ea3n xu\u1ea5t bi\u1ebfn t\u1ea7n.
    \n <\/p>\n","protected":false},"excerpt":{"rendered":"

    B\u1ea3ng tham kh\u1ea3o th\u00f4ng s\u1ed1 l\u1ef1a ch\u1ecdn \u0111i\u1ec7n tr\u1edf cho bi\u1ebfn t\u1ea7n. Lo\u1ea1i bi\u1ebfn t\u1ea7n 3 pha 380V C\u00f4ng su\u1ea5t bi\u1ebfn t\u1ea7n \u0110i\u1ec7n tr\u1edf C\u00f4ng su\u1ea5t \u0111i\u1ec7n tr\u1edf S\u1ed1 l\u01b0\u1ee3ng 0,75 kW 400\u03a9 260W 1 1,5\u00a0 kW 400\u03a9 390W 1 2,2 kW 150\u03a9 390W 1 4\/5.5 kW 150\u03a9 520W 1 5.5\/7.5 kW 100\u03a9 1040W 1 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13566],"tags":[13576,13559,13575,13577,13568],"class_list":["post-21183","post","type-post","status-publish","format-standard","hentry","category-dien-tro-xa","tag-cach-tinh-dien-tro","tag-cach-tinh-dien-tro-xa","tag-cach-tinh-dien-tro-xa-cho-bien-tan","tag-chon-dien-tro-xa","tag-dien-tro-xa-bien-tan"],"_links":{"self":[{"href":"https:\/\/hunglong.banbientan.com\/index.php?rest_route=\/wp\/v2\/posts\/21183","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hunglong.banbientan.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hunglong.banbientan.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hunglong.banbientan.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/hunglong.banbientan.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=21183"}],"version-history":[{"count":0,"href":"https:\/\/hunglong.banbientan.com\/index.php?rest_route=\/wp\/v2\/posts\/21183\/revisions"}],"wp:attachment":[{"href":"https:\/\/hunglong.banbientan.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=21183"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hunglong.banbientan.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21183"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hunglong.banbientan.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21183"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}