{"id":9173,"date":"2016-06-15T06:31:56","date_gmt":"2016-06-15T06:31:56","guid":{"rendered":"https:\/\/automation-electric.com\/motor-trifazat-conectat-la-o-sursa-de-alimentare-monofazata\/"},"modified":"2026-01-17T20:22:20","modified_gmt":"2026-01-17T20:22:20","slug":"motor-trifazat-conectat-la-o-sursa-de-alimentare-monofazata","status":"publish","type":"post","link":"https:\/\/automation-electric.com\/ro\/motor-trifazat-conectat-la-o-sursa-de-alimentare-monofazata\/","title":{"rendered":"Motor trifazat conectat la o surs\u0103 de alimentare monofazat\u0103"},"content":{"rendered":"<h6 style=\"text-align: center;\">fig.1 Conexiune Delta <\/h6>\n<h6> Se \u00eent\u00e2mpl\u0103 destul de des ca motoarele trifazate s\u0103 fie conectate la tensiune monofazat\u0103. Acest lucru nu prezint\u0103 o problem\u0103 mare de conectare, singura problem\u0103 cu adev\u0103rat important\u0103 este consumul de energie, deoarece eficien\u021ba acestor motoare va sc\u0103dea. Dac\u0103 este un motor de putere mic\u0103 \u0219i este rar utilizat, nu ar fi o problem\u0103, dar dac\u0103 este un motor, s\u0103 zicem de 4 kW \u0219i \u00eel utiliza\u021bi zilnic c\u00e2teva ore, poate ar trebui s\u0103 lua\u021bi serios \u00een considerare comandarea unuia monofazat. \u00cen principiu, un motor trifazat conectat la tensiune monofazat\u0103 poate fi realizat \u00een diferite moduri, dar cele mai comune sunt conexiunile stea \u0219i delta. Acum, dup\u0103 cum am spus, eficien\u021ba motorului trifazat conectat la tensiune monofazat\u0103 scade indiferent de modul de conectare pe care \u00eel alege\u021bi, dar va fi \u0219i mai ineficient dac\u0103 \u00eel conecta\u021bi \u00een modul stea, prin urmare, ori de c\u00e2te ori alege\u021bi o conexiune monofazat\u0103, aceasta trebuie s\u0103 fie \u00een modul delta. Din punct de vedere tehnic, motorul nu va porni at\u00e2t de simplu, deoarece nu exist\u0103 nicio deplasare de faz\u0103, a\u0219a c\u0103 trebuie s\u0103 instal\u0103m un condensator pentru a ajuta motorul s\u0103 porneasc\u0103, numit condensator de pornire <img decoding=\"async\" id=\"equationview\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?C_%7Bs%7D\" alt=\"\" name=\"equationview\"> \u0219i un alt condensator, numit condensator de func\u021bionare <img decoding=\"async\" id=\"equationview\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?C_%7Bf%7D\" alt=\"\" name=\"equationview\">, acesta va fi folosit pentru a cre\u0219te eficien\u021ba motorului. Valorile acestor condensatori vor fi alese dup\u0103 cum urmeaz\u0103:      <\/h6>\n<h6>-pentru conexiune stea:<\/h6>\n<h6><img decoding=\"async\" id=\"equationview\" class=\"aligncenter\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?C_%7Bf%7D%3D2800%5Ccdot%20%5Cfrac%7BI_%7Bn%7D%7D%7BU%7D%5B%5Cmu%20F%5D\" alt=\"\" name=\"equationview\"><img decoding=\"async\" id=\"equationview\" class=\"aligncenter\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?C_%7Bs%7D%3D3%5Ccdot%20C_%7Bf%7D%5B%5Cmu%20F%5D\" alt=\"\" name=\"equationview\"><\/h6>\n<h6>-pentru conexiune delta:<img decoding=\"async\" id=\"equationview\" class=\"aligncenter\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?C_%7Bf%7D%3D4800%5Ccdot%20%5Cfrac%7BI_%7Bn%7D%7D%7BU%7D%5B%5Cmu%20F%5D\" alt=\"\" name=\"equationview\"><img decoding=\"async\" id=\"equationview\" class=\"aligncenter\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?C_%7Bs%7D%3D3%5Ccdot%20C_%7Bf%7D%5B%5Cmu%20F%5D\" alt=\"\" name=\"equationview\"><\/h6>\n<h6><img decoding=\"async\" id=\"equationview\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?C_%7Bf%7D\" alt=\"\" name=\"equationview\"> &#8211; condensator de func\u021bionare<\/h6>\n<h6><img decoding=\"async\" id=\"equationview\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?C_%7Bs%7D\" alt=\"\" name=\"equationview\"> &#8211; condensator de pornire<\/h6>\n<h6><img decoding=\"async\" id=\"equationview\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?I_%7Bn%7D\" alt=\"\" name=\"equationview\"> &#8211; curent nominal al motorului<\/h6>\n<h6><img decoding=\"async\" id=\"equationview\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?U\" alt=\"\" name=\"equationview\"> &#8211; tensiune nominal\u0103 a motorului<\/h6>\n<h6>Dup\u0103 cum am spus, exist\u0103 mai multe metode de conectare de la trifazat la monofazat, am desenat doar dou\u0103 scheme stea \u0219i delta, care sunt aproape identice, singura diferen\u021b\u0103 este pe cutia de borne a motorului unde \u00eel conecta\u021bi \u00een stea sau delta.<\/h6>\n<h6><strong>Mod de operare<\/strong>: Prin ap\u0103sarea butonului <strong>Start<\/strong>, bobina contactorului <strong>Q2<\/strong> este alimentat\u0103, motorul va fi conectat \u0219i se men\u021bine dup\u0103 ce butonul este eliberat prin intermediul contactului auxiliar al <strong>Q2<\/strong> <strong>, Stop<\/strong> \u0219i <strong>Oprire de urgen\u021b\u0103<\/strong> (nu este obligatoriu). Butonul <strong>Start<\/strong> este un buton de ap\u0103sare momentan\u0103 \u0219i are dou\u0103 contacte, contactul <strong>3-4<\/strong> l-am reprezentat at\u00e2t \u00een circuitele de control, c\u00e2t \u0219i \u00een cele de alimentare pentru a \u00een\u021belege mai bine cum condensatorul de pornire <img decoding=\"async\" id=\"equationview\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?C_%7Bs%7D\" alt=\"\" name=\"equationview\"> ar trebui s\u0103 fie conectat cu butonul <strong>Start<\/strong>, astfel \u00eenc\u00e2t contactul <strong>3 -4<\/strong> va fi conectat numai \u00een timp ce butonul <strong>Start<\/strong> este ap\u0103sat. Prin urmare, c\u00e2nd porni\u021bi motorul, trebuie s\u0103 \u021bine\u021bi ap\u0103sat butonul <strong>Start<\/strong> pentru a conecta condensatorul de pornire p\u00e2n\u0103 c\u00e2nd motorul atinge viteza nominal\u0103, apoi c\u00e2nd elibera\u021bi butonul, condensatorul de pornire <img decoding=\"async\" id=\"equationview\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?C_%7Bs%7D\" alt=\"\" name=\"equationview\"> va fi deconectat \u0219i motorul va func\u021biona \u00een condi\u021bii normale. C\u00e2nd apare o suprasarcin\u0103, \u00eentrerup\u0103torul termic-magnetic <strong>Q1<\/strong> se deschide, astfel \u00eenc\u00e2t motorul este oprit instantaneu.   <\/h6>\n<hr>\n<h6><strong>Calculul componentelor<\/strong><\/h6>\n<hr>\n<h6>Valorile pentru <strong>Q1, Q2<\/strong> trebuie alese \u00een func\u021bie de puterea nominal\u0103 a motorului, \u00een conformitate cu datele de pe pl\u0103cu\u021ba motorului. Fi\u021bi aten\u021bi c\u00e2nd cump\u0103ra\u021bi componente, trebuie s\u0103 \u021bine\u021bi cont de faptul c\u0103 conecta\u021bi motorul la o surs\u0103 de alimentare monofazat\u0103, de exemplu, un \u00eentrerup\u0103tor termic-magnetic (<strong>Q1<\/strong> \u00een desen) pentru un motor trifazat de 4 kW poate fi utilizat de un motor monofazat de numai 2,2 kW, aceea\u0219i situa\u021bie \u0219i pentru <strong>Q2<\/strong>. Siguran\u021bele <strong>F1<\/strong> pentru circuitul de control pot avea valori de p\u00e2n\u0103 la maximum 10 A.  <\/h6>\n<h6>\n","protected":false},"excerpt":{"rendered":"<p>fig.1 Conexiune Delta Se \u00eent\u00e2mpl\u0103 destul de des ca motoarele trifazate s\u0103 fie conectate la tensiune monofazat\u0103. Acest lucru nu prezint\u0103 o problem\u0103 mare de conectare, singura problem\u0103 cu adev\u0103rat<\/p>\n","protected":false},"author":1,"featured_media":9174,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[931],"tags":[],"class_list":["post-9173","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pornirea-motoarelor-trifazate"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Motor trifazat conectat la o surs\u0103 de alimentare monofazat\u0103 | Automation-Electric<\/title>\n<meta name=\"description\" content=\"{:en}Motor trifazat conectat la o surs\u0103 de alimentare monofazat\u0103 Motor trifazat conectat la re\u021bea trifazat\u0103{:}\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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