Imveliso ye Inqanaba lesithathu le-asynchronous motorkufuneka ikhethwe ngokwamandla afunwa ngoomatshini bokuvelisa, kunye nenqanaba lesithathu le-asynchronous motor kufuneka liqhutywe phantsi komthwalo olinganisiweyo kangangoko kunokwenzeka. Xa ukhetha ubungakanani bamandla enjini, injongo kufuneka ifaneleke.
Malunga nendlela yokhetho yobungakanani bamandla weisigaba sesithathu se-asynchronous induction ACmotor.
Ukukhetha inqanaba lesithathu le-asynchronous motor enamandla afanelekileyo akuyi kutshabalalisa amandla ombane okanye ukulayisha ngaphezulu kwemoto ixesha elide. Ukuba amandla emoto aphantsi kakhulu. "Inqwelo encinci" iyenzeka, ibangela ukuba i-motor ilayishwe kakhulu ixesha elide, ibangela ukuba izinto zokugquma zonakaliswe bubushushu. Nokuba i-motor iyatsha, ukuba amandla emoto makhulu kakhulu, "i-marathon enkulu" iya kwenzeka. Amandla alo omatshini anokusetyenziswa ngokupheleleyo, amandla kunye namandla awaphezulu, kwaye avelisa amandla ombane.
Indlela yoku-1: Sebenzisa ifomyula ukubala amandla afunwa yi-asynchronous motor yesigaba esithathu:
- Kwindlela yokusebenza eqhubekayo, amandla omthwalo (oko kukuthi, amandla kwi-shaft mechanical) i-Pl (kW) iyaziwa. Le fomula ilandelayo ingasetyenziselwa ukubala amandla e-P (kW) yemoto: P=P1/n1 n2 Apho i-n1 ingamandla omatshini wokuvelisa kwaye i-n2 ingamandla enjini. La mandla othumelo.
Ngokwamandla afunyenwe ngale fomyula ingentla, kuba amandla kunye nokunye akufuneki ukuba kuchaneke kakhulu, kwaye ukulahlekelwa kwamandla omatshini kuneenguqu ezithile, amandla alinganisiweyo emoto ekhethiweyo kufuneka alingane okanye abe mkhulu kancinane kunamandla ababalwayo.
Ukuba iinjini yombane ngamandla ka-0.8 ekhethiweyo, zama ukufumanisa ukuba zingaphi iikilowatts amandla emoto kufuneka abe. Isisombululo: P=P1/n1n2=3.95/0.7*0.8=7.1kW Ekubeni kungekho nkcazo ye-7.1kW, i-7.5kW yesigaba sesithathu se-asynchronous motor ikhethiwe.
- Ukusebenza kwexesha elifutshane kulinganiswe injini. Xa kuthelekiswa nemoto enamandla alinganisiweyo afanayo ngexesha lokusebenza okuqhubekayo. Amacandelo amancinci, i-torque enkulu enkulu, kunye nexabiso eliphantsi. Ukuba iimeko zivumela, i-motor ye-asynchronous yesigaba sesithathu kunye ne-short-term rating ye-S2 kufuneka ikhethwe kangangoko kunokwenzeka.
- Kwinqanaba lesithathu leenjini ze-asynchronous ezinesantya sokusebenza kwe-S3, khetha ubungakanani bemveliso. Ngokobungakanani besantya somthwalo we-freewheeling, i-motor ye-asynchronous yesigaba sesithathu kunye nenkqubo yokusebenza ye-S3 ikhethiwe, esetyenziselwa ngokukodwa ukusebenza kwesikhashana. Ifomula yokubala yomthwalo we-Fs% ukuqhubeka nguFs%=tg/(Tg+ukuya)×100%, apho iTg lixesha lokusebenza (iyunithi: min), t yitorque yokumiswa (iyunithi: min); Tg ishumi ukuya lixesha lomjikelo (iyunithi: min)
Indlela yesi-2: Sebenzisa indlela yokulinganisa ukukhetha amandla ombane wesigaba sesithathu se-asynchronous. Into ebizwa ngokuba yi-analogy, efaniswa nokusebenza kwesigaba sesithathu se-asynchronous motor esetyenziswe kumatshini ofanayo wokuvelisa.
Indlela ethile yile: qonda amandla asetyenziswa ngoomatshini bokuvelisa abafanayo kufutshane nale yunithi okanye ezinye iiyunithi, kwaye emva koko ukhethe iimotor ezikufutshane ukuze usebenze ngolingo. Umsebenzi wovavanyo ujonge ukujonga ukuba i-motor ekhethiweyo iyahambelana nomatshini wokuvelisa. Indlela yokuqinisekisa yile: yenza i-hoist yombane iqhube umatshini wokuvelisa ukusebenza. Sebenzisa i-ammeter ye-clamp ukulinganisa ukusebenza kwangoku kwe-motor yesigaba sesithathu se-asynchronous motor, kwaye uthelekise umphumo wokulinganisa kunye nomlinganiselo okhoyo ochazwe kwi-motor nameplate.
Indlela yesi-3: Indlela yokuvavanya ifanelekile:
- Ukuba umsebenzi wangoku wemoto awuphambuki ngokuphawulekayo kwi-nominal current ebonisiweyo. Oku kubonisa ukuba ukusebenza kwemoto ekhethiweyo kwanele.
- Ukuba owona msebenzi ukhoyo wemoto ungaphantsi kwama-70% kunomlinganiselo wangoku ochazwe kwi-nameplate. Emva koko ibonisa ukuba amandla emoto aphezulu kakhulu (oko kukuthi "inqwelo enkulu" kufuneka itshintshwe ngemoto enamandla aphantsi).
- Ukuba umbane osebenzayo wangoku ungaphezulu kwe-40% ephezulu kunomthamo olinganisiweyo wamandla ochazwe kwi-nameplate. Oku kubonisa ukuba amandla emoto asezantsi kakhulu (oko kukuthi "inqwelo encinci"), oko kukuthi, i-motor yamandla enkulu kufuneka itshintshwe.