{"id":9102,"date":"2016-06-15T06:31:56","date_gmt":"2016-06-15T06:31:56","guid":{"rendered":"https:\/\/automation-electric.com\/motor-trifazat-conectat-la-retea-monofazata\/"},"modified":"2026-01-17T20:57:15","modified_gmt":"2026-01-17T20:57:15","slug":"motor-trifazat-conectat-la-retea-monofazata","status":"publish","type":"post","link":"https:\/\/automation-electric.com\/ro\/motor-trifazat-conectat-la-retea-monofazata\/","title":{"rendered":"Motor trifazat conectat la re\u021bea monofazat\u0103"},"content":{"rendered":"<\/h6>\n<p style=\"text-align: center;\"><span style=\"color: #000000;\">fig.1 Conexiunea triunghi <\/span><\/p>\n<p><span style=\"color: #000000;\"> Se \u00eent\u00e2mpl\u0103 destul de des ca motoare trifazate s\u0103 fie conectate la tensiune monofazat\u0103. Aceasta nu prezint\u0103 o foarte mare problem\u0103 de conexiune, singura problem\u0103 cu adev\u0103rat important\u0103 este cea a consumului de energie, deoarece aceste motoare o s\u0103 \u00ee\u0219i piard\u0103 din randament. Dac\u0103 este un motor de putere mic\u0103 \u0219i este utilizat mai rar asta nu ar fi o problem\u0103, \u00eens\u0103 dac\u0103 este un motor, s\u0103 zicem de 4 kW \u0219i \u00eel utiliza\u021bi zilnic c\u00e2teva ore, poate ar trebui s\u0103 v\u0103 g\u00e2ndi\u021bi serios s\u0103 comanda\u021bi unul monofazat. \u00cen principiu un motor trifazat conectat la tensiune monofazat\u0103 se poate realiza \u00een diferite moduri, dar cele mai des \u00eent\u00e2lnite sunt conexiunile stea \u0219i triunghi. Acum, dup\u0103 cum am spus randamentul motorului trifazat conectat la tensiune monofazat\u0103 scade \u0219i asta indiferent ce mod de conexiune alege\u021bi, dar va fi \u0219i mai ineficient\u0103 dac\u0103 \u00eel ve\u021bi conecta \u00een stea, prin urmare ori de c\u00e2te ori ve\u021bi alege o conexiune monofazat\u0103 aceasta s\u0103 fie \u00een triunghi, cum se spune din dou\u0103 lucruri rele alegem r\u0103ul cel mai mic. Din punct de vedere tehnic motorul nu o s\u0103 porneasc\u0103 a\u0219a simplu, deoarece nu prea mai exist\u0103 defazaj, a\u0219a c\u0103 o s\u0103 \u00eel ajut\u0103m ori cu o sfoar\u0103 ori o s\u0103 punem ceva condensatori, unul de start, reprezentat \u00een scheme ca <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 unul 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\">. Valorile acestor condensatoare vor fi alese dup\u0103 cum urmeaz\u0103:      <\/span><\/p>\n<p><span style=\"color: #000000;\">-pentru conexiune stea:<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\"><\/span><\/p>\n<p><span style=\"color: #000000;\">-pentru conexiunea triunghi:<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\"><\/span><\/p>\n<p><span style=\"color: #000000;\"><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 func\u021bionare<\/span><\/p>\n<p><span style=\"color: #000000;\"><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 start<\/span><\/p>\n<p><span style=\"color: #000000;\"><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<\/span><\/p>\n<p><span style=\"color: #000000;\"><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 de alimentare motor<\/span><\/p>\n<p><span style=\"color: #000000;\">Dup\u0103 cum am spus exist\u0103 mai multe metode de conectare din trifazat \u00een monofazat, eu am desenat doar dou\u0103 scheme pentru stea \u0219i triunghi, care evident sunt aproape identice singura diferen\u021b\u0103 este la pl\u0103cu\u021ba cu borne a motorului unde ve\u021bi conecta \u00een stea sau triunghi.<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>Modul de operare:<\/strong> Prin ac\u021bionarea butonului <strong>Start<\/strong> se energizeaz\u0103 bobina contactorului <strong>Q2,<\/strong> motorul v-a fi conectat \u0219i se automen\u021bine dup\u0103 eliberarea butonului <strong>Start <\/strong>prin contactul auxiliar al <strong>Q2,<\/strong> butonul <strong>Stop <\/strong>si butonul de urgenta<strong> Emergency Stop<\/strong>(care nu este obligatoriu)<strong>. <\/strong>Butonul<strong> Start <\/strong>este un buton cu revenire la actionare si are 2 contacte, contactul <strong>3-4<\/strong> l-am reprezentat in ambele scheme si cea de comanda si cea de forta, pentru a intelege mai bine cum trebuie conectat la condensatorul de pornire<strong> <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\">, <\/strong>astfel contactul <strong>3-4<\/strong> v-a fi conectat numai cat timp este tinut apasat butonul<strong> Start.<\/strong> Prin urmare in momentul cand vei porni motorul vei tine apasat butonul <strong>Start<\/strong> pentru a conecta si condensatorul de start <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\">, pana motorul v-a ajunge la turatia nominala, dupa care eliberezi butonul si motorul o sa functioneze in conditii normale . La suprasarcin\u0103 se deschide disjunctorul magneto-termic <strong>Q1 <\/strong>astfel ca motorul este oprit instantaneu.<\/span><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><strong>Dimensionarea componentelor<\/strong><\/span><\/p>\n<hr>\n<p><span style=\"color: #000000;\">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 cu informa\u021bii dat\u0103 de produc\u0103tor . Aten\u021bie c\u00e2nd cump\u0103ra\u021bi componentele trebuie s\u0103 \u021bine\u021bi cont c\u0103 motorul \u00eel conecta\u021bi la tensiune monofazat\u0103, spre exemplu un disjunctor magneto-termic (<strong>Q1<\/strong> \u00een schema) pentru un motor trifazat de 4 kW va putea fi utilizat de un motor monofazat de doar 2,2 kW, idem \u0219i pentru <strong>Q2<\/strong>. Siguran\u021bele fuzibile <strong>F1,<\/strong> pentru partea de comand\u0103 pot avea valori de p\u00e2n\u0103 la max 10 A.  <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>fig.1 Conexiunea triunghi Se \u00eent\u00e2mpl\u0103 destul de des ca motoare trifazate s\u0103 fie conectate la tensiune monofazat\u0103. Aceasta nu prezint\u0103 o foarte mare problem\u0103 de conexiune, singura problem\u0103 cu adev\u0103rat<\/p>\n","protected":false},"author":1,"featured_media":9103,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[933],"tags":[],"class_list":["post-9102","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pornirea-motoarelor-trifazate-2"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Motor trifazat conectat la re\u021bea monofazat\u0103 | Automation-Electric<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/automation-electric.com\/ro\/motor-trifazat-conectat-la-retea-monofazata\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Motor trifazat conectat la re\u021bea monofazat\u0103 | Automation-Electric\" \/>\n<meta property=\"og:description\" content=\"fig.1 Conexiunea triunghi Se \u00eent\u00e2mpl\u0103 destul de des ca motoare trifazate s\u0103 fie conectate la tensiune monofazat\u0103. 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