{"id":8235457,"date":"2026-10-24T17:31:45","date_gmt":"2026-10-24T17:31:45","guid":{"rendered":"https:\/\/scn.eu\/?post_type=scn_guide&#038;p=8235457"},"modified":"2026-10-24T17:32:53","modified_gmt":"2026-10-24T17:32:53","slug":"sagedusmuundur","status":"publish","type":"scn_guide","link":"https:\/\/scn.eu\/et\/juhendid\/sagedusmuundur\/","title":{"rendered":"Sagedusmuundur \u2013 kuidas valida \u00f5iget sagedusmuundurit"},"content":{"rendered":"<div class=\"scn-guide\">\n<h1>Sagedusmuundur \u2013 kuidas valida \u00f5iget sagedusmuundurit<\/h1>\n<p class=\"g-lead\">Sagedusmuundur reguleerib elektrimootori kiirust ja s\u00e4\u00e4stab pumpades ning ventilaatorites sageli palju energiat. Selles juhendis r\u00e4\u00e4gime juhtimisviisidest, m\u00f5\u00f5tmestamisest, pidurdamisest, EMC-st ja ohutusest.<\/p>\n<div class=\"g-short\"><b class=\"t\">L\u00fchike vastus<\/b><\/p>\n<ul>\n<li><b>Funktsioon<\/b> \u2013 muundur teeb vooluv\u00f5rgu fikseeritud 50 Hz-st muudetava sageduse ja pinge, nii et mootori kiirust saab sujuvalt reguleerida.<\/li>\n<li><b>M\u00f5\u00f5tmesta voolu j\u00e4rgi<\/b> \u2013 l\u00e4htu mootori nimivoolust ja koormuse vajalikust \u00fclekoormusest, mitte ainult v\u00f5imsusest.<\/li>\n<li><b>Tava- v\u00f5i raskekoormus<\/b> \u2013 pumpadele ja ventilaatoritele piisab tavaliselt tavakoormusest. Konveierid, kraanad ja pressid vajavad raskekoormust.<\/li>\n<li><b>Pidurdamine<\/b> \u2013 suured inertsimomendid ja langetatavad koormused vajavad pidurdustakistit v\u00f5i energia tagastamist v\u00f5rku.<\/li>\n<li><b>Paigaldus<\/b> \u2013 varjestatud mootorikaabel, \u00f5ige EMC-filter ja STO on sama olulised kui muunduri valik.<\/li>\n<\/ul>\n<\/div>\n<h2>Mida sagedusmuundur teeb?<\/h2>\n<p>V\u00f5rku \u00fchendatud as\u00fcnkroonmootor t\u00f6\u00f6tab peaaegu konstantse kiirusega \u2013 neljapooluseline mootor 50 Hz juures veidi alla 1500 p\/min. Sagedusmuundur alaldab v\u00f5rgupinge DC-vahel\u00fclis alalispingeks. Seej\u00e4rel loob IGBT-transistoridega vaheldi uue kolmefaasilise pinge, mille sagedus ja pinge on vabalt valitavad. Nii saab mootori kiirust t\u00e4ielikult reguleerida ning k\u00e4ivitused ja seiskamised on sujuvad. Muundur juhib nii as\u00fcnkroonmootoreid kui ka p\u00fcsimagnetmootoreid (PM-mootoreid), mis on t\u00f5husamad, kuid tavaliselt ei saa otse v\u00f5rgust t\u00f6\u00f6tada.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-frekvensomriktare-f1-et.webp\" alt=\"Plokkskeem: vooluv\u00f5rk, alaldi, DC-vahel\u00fcli, vaheldi ja mootor ning DC-vahel\u00fcliga \u00fchendatud pidurduskatkesti ja pidurdustakisti.\" width=\"1520\" height=\"472\" loading=\"lazy\" decoding=\"async\"><figcaption>Alaldi, DC-vahel\u00fcli ja vaheldi. Pidurdamisel neelab energia pidurduskatkesti.<\/figcaption><\/figure>\n<h3>Miks kiiruse reguleerimine energiat s\u00e4\u00e4stab?<\/h3>\n<p>Tsentrifugaalpumpades ja ventilaatorites kasvab v\u00f5imsusvajadus ligikaudu kiiruse kuubiga. 80-protsendilise kiiruse juures vajab mootor teoreetiliselt vaid umbes poolt v\u00f5imsusest. Drosselreguleerimise korral t\u00f6\u00f6tab mootor t\u00e4iskiirusel ja energia l\u00e4heb kaotsi ventiilis v\u00f5i siibris. Staatiline t\u00f5stek\u00f5rgus v\u00f5i vastur\u00f5hk v\u00e4hendab s\u00e4\u00e4stu, kuid sageli on see siiski suur.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-frekvensomriktare-f2-et.webp\" alt=\"Tulpdiagramm: v\u00f5imsusvajadus 100, 90, 80, 70, 60 ja 50 protsendi kiirusel on 100, 73, 51, 34, 22 ja 13 protsenti.\" width=\"1520\" height=\"512\" loading=\"lazy\" decoding=\"async\"><figcaption>Pumba v\u00f5i ventilaatori teoreetiline v\u00f5imsusvajadus ilma staatilise t\u00f5stek\u00f5rguseta.<\/figcaption><\/figure>\n<h3>Kus sagedusmuundureid kasutatakse?<\/h3>\n<ul>\n<li><b>Hooned<\/b> \u2013 ventilaatorid, tsirkulatsioonipumbad ja jahutid ventilatsiooni- ja k\u00fcttes\u00fcsteemides.<\/li>\n<li><b>Vesi ja reovesi<\/b> \u2013 pumplad ning puhastusjaamade puhurid. Sujuv k\u00e4ivitus ja seiskamine v\u00e4hendavad h\u00fcdraulilisi l\u00f6\u00f6ke.<\/li>\n<li><b>Tehased ja masinaehitus<\/b> \u2013 konveierid, segistid, ekstruuderid ja kompressorid.<\/li>\n<li><b>T\u00f5steseadmed<\/b> \u2013 sildkraanad, pukk-kraanad ja liftid, kus muundur juhib piduri j\u00e4rjestust.<\/li>\n<li><b>Energeetika ja meres\u00f5it<\/b> \u2013 elektrijaamade jahutusveepumbad ja laevade vintsid.<\/li>\n<\/ul>\n<h2>V\/f-juhtimine v\u00f5i vektorjuhtimine?<\/h2>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Juhtimisviis<\/th>\n<th>Kuidas see t\u00f6\u00f6tab<\/th>\n<th>Sobib<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">V\/f-juhtimine<\/td>\n<td>Pinge j\u00e4rgib sagedust fikseeritud suhtes.<\/td>\n<td>Pumbad, ventilaatorid ja mitu mootorit \u00fche muunduri taga.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Anduriteta vektorjuhtimine<\/td>\n<td>Muundur arvutab mootori magnetvoo ja p\u00f6\u00f6rdemomendi voolu ja pinge p\u00f5hjal.<\/td>\n<td>Enamik masinaid. Hea p\u00f6\u00f6rdemoment ka madalal kiirusel.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Suletud ahelaga vektorjuhtimine<\/td>\n<td>Enkooder annab tagasisidena tegeliku kiiruse.<\/td>\n<td>T\u00e4ielik p\u00f6\u00f6rdemoment seisu ajal, t\u00f5steseadmed ja kerimismasinad.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>PM-mootorid vajavad \u00fcldjuhul vektorjuhtimist. Kasutuselev\u00f5tul m\u00f5\u00f5dab automaath\u00e4\u00e4lestus mootori andmed. \u00c4ra j\u00e4ta seda vahele.<\/p>\n<h2>M\u00f5\u00f5tmestamine \u2013 vool, \u00fclekoormus ja koormust\u00fc\u00fcp<\/h2>\n<p>L\u00e4htu mootori nimivoolust. Kahe 15 kW mootori vool v\u00f5ib erineda s\u00f5ltuvalt pooluste arvust ja kasutegurist.<\/p>\n<p>Paljudel muunduritel on kaks nimiv\u00e4\u00e4rtust: <b>tavakoormus (ND, normal duty)<\/b> muutuva p\u00f6\u00f6rdemomendiga koormustele, nagu pumbad ja ventilaatorid, ning <b>raskekoormus (HD, heavy duty)<\/b> konstantse p\u00f6\u00f6rdemomendi ja raskete k\u00e4ivituste jaoks, nagu konveierites ja segistites. Tavaliselt lubab tavakoormus 110 % \u00fclekoormust 60 sekundi jooksul ja raskekoormus 150 % 60 sekundi jooksul. T\u00f5stmine vajab t\u00e4ielikku p\u00f6\u00f6rdemomenti seisu ajal, mehaanilise piduri juhtimist ja sageli enkoodrit.<\/p>\n<p>Nimiv\u00e4\u00e4rtused kehtivad kindlal temperatuuril, k\u00f5rgusel merepinnast ja l\u00fclitussagedusel. Kuum juhtkilp, \u00fcle 1000 meetri k\u00f5rgus v\u00f5i suurem l\u00fclitussagedus t\u00e4hendavad sageli, et muunduri koormatavust tuleb v\u00e4hendada.<\/p>\n<h2>Pidurdamine ja energia tagastamine<\/h2>\n<p>Kui mootor pidurdab v\u00f5i langetab koormust, t\u00f6\u00f6tab see generaatorina. Energia voolab tagasi DC-vahel\u00fclisse ja pinge t\u00f5useb, kuni muundur l\u00fclitub \u00fclepinge t\u00f5ttu v\u00e4lja.<\/p>\n<ul>\n<li><b>Pidurdustakisti<\/b> \u2013 pidurduskatkesti (brake chopper) l\u00fclitab sisse takisti, mis muudab energia soojuseks. Lihtne ja odav. V\u00e4iksematel muunduritel on pidurduskatkesti sageli sisse ehitatud.<\/li>\n<li><b>Rekuperatiivne pidurdusmoodul<\/b> \u2013 tagastab energia v\u00f5rku. Tasub end \u00e4ra sagedase pidurdamise korral kraanades, liftides ja tsentrifuugides.<\/li>\n<li><b>Aktiivne sisendaste (Active Front End) v\u00f5i maatriksmuundur<\/b> \u2013 muundur ise tagastab energia v\u00f5rku ja tarbib v\u00f5rgust peaaegu siinuselist voolu v\u00e4ga v\u00e4ikeste harmoonikutega.<\/li>\n<\/ul>\n<h2>EMC, mootorikaabel ja laagrivoolud<\/h2>\n<p>Muunduri kiire l\u00fclitamine tekitab k\u00f5rgsageduslikke h\u00e4ireid ja alaldi tekitab v\u00f5rgu harmoonikuid. Standard EN 61800-3 jagab ajamis\u00fcsteemid kategooriatesse:<\/p>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Kategooria<\/th>\n<th>Keskkond<\/th>\n<th>N\u00e4ide<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">C1<\/td>\n<td>Elamud ja kontorid<\/td>\n<td>V\u00e4ikesed muundurid hoonetes, sageli lisafiltriga.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">C2<\/td>\n<td>Nagu C1, paigaldab spetsialist<\/td>\n<td>Hooned. Paljudel muunduritel on sisseehitatud C2-filter.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">C3<\/td>\n<td>T\u00f6\u00f6stus<\/td>\n<td>Oma trafoga tehased.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">C4<\/td>\n<td>T\u00f6\u00f6stus, v\u00e4hemalt 1000 V v\u00f5i 400 A<\/td>\n<td>Suured EMC-plaaniga ajamis\u00fcsteemid.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<ul>\n<li><b>Varjestatud mootorikaabel<\/b> \u2013 \u00fchenda varje m\u00f5lemas otsas kogu \u00fcmberm\u00f5\u00f5du ulatuses (360\u00b0) EMC-kaablitihenditega.<\/li>\n<li><b>Pikad kaablid<\/b> \u2013 peegeldused v\u00f5ivad tekitada mootori juures pingepiike kuni kahekordse DC-vahel\u00fcli pingeni. Kui tootja piirpikkus on \u00fcletatud, kasuta dV\/dt- v\u00f5i siinusfiltrit.<\/li>\n<li><b>Rikkevoolukaitse<\/b> \u2013 EMC-filter p\u00f5hjustab lekkevoolu ja rike v\u00f5ib tekitada maasse alalisvoolu. Kolmefaasilised muundurid vajavad sageli B-t\u00fc\u00fcpi rikkevoolukaitset.<\/li>\n<\/ul>\n<p><b>Laagrivoolud<\/b> tekivad, kui muunduri \u00fchisfaasipinge laeb end t\u00fchjaks l\u00e4bi mootori laagrite ja s\u00f6\u00f6vitab laagrir\u00f5ngastesse vaod. Laager v\u00f5ib siis m\u00f5ne kuuga rikki minna. Risk kasvab koos mootori suurusega. Vastumeetmed on isoleeritud laagrid, v\u00f5lli maandusr\u00f5ngas, \u00fchisfaasifiltrid ja \u00f5ige varjestus.<\/p>\n<h2>Side, STO ja paigaldus<\/h2>\n<p>Lihtsates s\u00fcsteemides kasutatakse digitaalseid sisendeid ja 0\u201310 V v\u00f5i 4\u201320 mA seadesignaali. T\u00e4nap\u00e4eva masinates kasutatakse tavaliselt v\u00f5rku: <b>PROFINET<\/b> Siemensi keskkonnas, <b>EtherNet\/IP<\/b> Rockwelli puhul, <b>EtherCAT<\/b> liikumisjuhtimisega masinates ning <b>Modbus<\/b> v\u00f5i BACnet pumplates ja hoonetes. Juhtimiss\u00fcsteem saab siis lugeda ka voolu, p\u00f6\u00f6rdemomenti, energiatarbimist ja h\u00e4ireid.<\/p>\n<p><b>STO (Safe Torque Off)<\/b> eemaldab mootori p\u00f6\u00f6rdemomendi kahe s\u00f5ltumatu kanali kaudu. Funktsioon on m\u00e4\u00e4ratletud standardis IEC 61800-5-2 ja vastab standardi IEC 60204-1 seiskamiskategooriale 0. Ohutuskaardiga saad ka funktsiooni SS1, mis t\u00e4hendab juhitud seiskamist ja seej\u00e4rel STO-d. STO ei asenda lahkl\u00fclitit \u2013 mootorikaablis on endiselt pinge.<\/p>\n<p>Enamik muundureid on IP20 kaitseklassiga ja m\u00f5eldud juhtkilpi paigaldamiseks, kus m\u00f5ni protsent v\u00f5imsusest muutub soojuseks, mis tuleb \u00e4ra juhtida. Tehasesse otse paigaldamiseks on saadaval IP55 mudelid.<\/p>\n<h2>Levinud vead<\/h2>\n<ol class=\"g-pit\">\n<li><b>Muundur valitakse kW j\u00e4rgi.<\/b> Paljude poolustega v\u00f5i madala kasuteguriga mootor tarbib rohkem voolu kui sama v\u00f5imsusega neljapooluseline mootor.<\/li>\n<li><b>Kontaktor katkestab mootoriahela t\u00f6\u00f6 ajal.<\/b> See v\u00f5ib kahjustada muunduri v\u00e4ljundastet. Peata k\u00f5igepealt STO v\u00f5i seiskamisk\u00e4suga.<\/li>\n<li><b>Pidurdusvajadus unustatakse.<\/b> Suur ventilaator v\u00f5i allam\u00e4ge liikuv konveier v\u00f5ib iga seiskamise ajal \u00fclepinge t\u00f5ttu v\u00e4lja l\u00fclituda.<\/li>\n<li><b>Mootor t\u00f6\u00f6tab pikalt madalal kiirusel ja suure p\u00f6\u00f6rdemomendiga.<\/b> Omaventilatsiooniga mootor kuumeneb siis \u00fcle. Kasuta eraldi jahutusventilaatorit v\u00f5i suuremat mootorit.<\/li>\n<\/ol>\n<h2>Sagedusmuundurid SCN-ilt<\/h2>\n<p>Pakume Yaskawa sagedusmuundureid: \u00fcldotstarbelised mudelid alates 0,1 kW-st, suure j\u00f5udlusega muundurid kuni 630 kW ning spetsiaalsed mudelid hoonetele, kraanadele ja liftidele, lisaks rekuperatiivsed pidurdusmoodulid ja maatriksmuundur U1000. R\u00e4\u00e4gi meile mootorist, koormusest ja keskkonnast ning aitame valida suuruse ja lisavarustuse.<\/p>\n<h3>N\u00e4iteid meie valikust<\/h3>\n<div class=\"g-prod\"><a class=\"g-pc\" href=\"https:\/\/scn.eu\/et\/toode\/hv600-hvac-inverter-et\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/yaskawa-hv600-main.webp\" alt=\"Yaskawa HV600 sagedusmuundur HVAC-s\u00fcsteemidele\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Yaskawa<\/span><span class=\"g-pn\">HV600 sagedusmuundur HVAC-s\u00fcsteemidele<\/span><span class=\"g-pw\">Hoonete ventilaatoritele, pumpadele ja kompressoritele, sisseehitatud C2 EMC-filtri, BACneti ja Modbus RTU-ga.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/et\/toode\/cr700-crane-inverter-et\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/yaskawa-cr700-main.webp\" alt=\"Yaskawa CR700 sagedusmuundur kraanadele\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Yaskawa<\/span><span class=\"g-pn\">CR700 sagedusmuundur kraanadele<\/span><span class=\"g-pw\">Kraanamuundur vahemikus 0,55\u2013315 kW spetsiaalse piduri juhtimise j\u00e4rjestuse ja koormuse kontrolliga.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/et\/toode\/u1000-et\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/U1000.png\" alt=\"Yaskawa U1000\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Yaskawa<\/span><span class=\"g-pn\">U1000<\/span><span class=\"g-pw\">Maatriksmuundur \u00fclimadalate harmoonikutega ja pidurdusenergia t\u00e4ieliku tagastamisega v\u00f5rku.<\/span><\/a><\/div>\n<div class=\"g-links\"><a href=\"https:\/\/scn.eu\/et\/tootekategooria\/tooteid\/drives-and-motion-et\/frequency-inverters-et\/\">Sagedusmuundurid<\/a><a href=\"https:\/\/scn.eu\/et\/tootekategooria\/tooteid\/drives-and-motion-et\/frequency-inverters-et\/special-inverters-et\/\">Erisagedusmuundurid<\/a><a href=\"https:\/\/scn.eu\/et\/tootekategooria\/tooteid\/drives-and-motion-et\/\">Ajamid ja liikumisjuhtimine<\/a><a href=\"https:\/\/scn.eu\/et\/tootekategooria\/tooteid\/drives-and-motion-et\/servo-motors-et\/\">Servomootorid<\/a><a href=\"https:\/\/scn.eu\/et\/tootekategooria\/tooteid\/sensors-et\/incremental-encoders\/\">Inkrementaalsed enkoodrid<\/a><\/div>\n<div class=\"g-cta\">\n<p>Kas sa ei ole kindel suuruse, pidurdamise v\u00f5i EMC-filtri osas? K\u00fcsi meie inseneridelt \u2013 vastuse saad 24 tunni jooksul.<\/p>\n<p><a href=\"https:\/\/scn.eu\/et\/kontakt\/\">K\u00fcsi inseneri k\u00e4est<\/a><\/div>\n<h2>Korduma kippuvad k\u00fcsimused<\/h2>\n<details>\n<summary>Mis vahe on sagedusmuunduril ja sujuvk\u00e4ivitil?<\/summary>\n<p>Sujuvk\u00e4iviti tagab ainult sujuva k\u00e4ivituse, seej\u00e4rel t\u00f6\u00f6tab mootor t\u00e4iskiirusel. Sagedusmuundur reguleerib kiirust kogu aeg ja saab seet\u00f5ttu energiat s\u00e4\u00e4sta.<\/p>\n<\/details>\n<details>\n<summary>Kas tavalist mootorit saab sagedusmuunduriga kasutada?<\/summary>\n<p>Jah, enamiku t\u00e4nap\u00e4eva as\u00fcnkroonmootoritega saab. Pikkade kaablite, 690 V toite ja suurte mootorite korral kontrolli mootori isolatsiooni ja kaitset laagrivoolude eest.<\/p>\n<\/details>\n<details>\n<summary>Mida t\u00e4hendab STO sagedusmuunduril?<\/summary>\n<p>Safe Torque Off \u2013 ohutusfunktsioon, mis eemaldab mootori p\u00f6\u00f6rdemomendi kahe s\u00f5ltumatu kanali kaudu. See ei asenda elektrit\u00f6\u00f6de jaoks lahkl\u00fclitit.<\/p>\n<\/details>\n<details>\n<summary>Kas sagedusmuundur v\u00f5ib t\u00f6\u00f6tada \u00fchefaasilise toitega?<\/summary>\n<p>Jah, v\u00e4iksemad muundurid v\u00f5tavad sisendiks \u00fchefaasilise 230 V ja annavad mootorile siiski kolmefaasilise pinge. Mootor \u00fchendatakse siis tavaliselt kolmnurka.<\/p>\n<\/details>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Sagedusmuundur reguleerib elektrimootori kiirust ja s\u00e4\u00e4stab pumpades ning ventilaatorites sageli palju energiat. Selles juhendis r\u00e4\u00e4gime juhtimisviisidest, m\u00f5\u00f5tmestamisest, pidurdamisest, EMC-st ja ohutusest.<\/p>\n","protected":false},"author":11,"featured_media":8235346,"template":"","meta":{"_yoast_wpseo_focuskw":"sagedusmuundur","_yoast_wpseo_metadesc":"Kuidas valida sagedusmuundurit: V\/f- v\u00f5i vektorjuhtimine, m\u00f5\u00f5tmestamine, pidurdustakistid, EMC-filtrid, mootorikaablid ja STO. 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