Indlela yokukhetha yosayizi wamandla we-asynchronous motor enezigaba ezintathu

Okukhiphayo kwe I-asynchronous motor enezigaba ezintathukufanele ikhethwe ngokwamandla adingwa umshini wokukhiqiza, futhi injini ye-asynchronous yezigaba ezintathu kufanele isetshenziswe ngaphansi komthwalo olinganiselwe ngangokunokwenzeka. Lapho ukhetha usayizi wamandla wenjini, inhloso kufanele ifanele.

Mayelana nendlela yokukhetha yosayizi wamandla weIsigaba sesithathu se-asynchronous induction ACmotor.

Ukukhetha i-asynchronous motor enezigaba ezintathu enamandla afanelekile ngeke kucekele phansi amandla kagesi noma kulayishe ngokweqile imoto isikhathi eside. Uma amandla emoto ephansi kakhulu. Ukwenzeka "kwenqola encane" kwenzeka, okubangela ukuthi injini igcwale kakhulu isikhathi eside, okubangela ukuthi impahla yokufakwayo yonakaliswe ukushisa. Ngisho noma injini isha, uma amandla emoto emakhulu kakhulu, "i-marathon enkulu" izokwenzeka. Amandla ayo okukhipha imishini angasetshenziswa ngokugcwele, isici samandla namandla awaphezulu, futhi akhiqiza amandla kagesi.

Indlela yoku-1: Sebenzisa ifomula ukubala amandla adingwa yi-asynchronous motor enezigaba ezintathu:

1. Ngendlela yokusebenza eqhubekayo, amandla okulayisha (okungukuthi, amandla ku-shaft mechanical) Pl (kW) ayaziwa. Ifomula elandelayo ingasetshenziswa ukubala amandla u-P (kW) wenjini: P=P1/n1 n2 Lapho u-n1 engamandla omshini wokukhiqiza futhi u-n2 amandla enjini. Lawa amandla okudlulisa.

Ngokusho kwamandla atholwe yifomula engenhla, ngoba amandla nokunye akudingi ukuba nembe kakhulu, futhi ukulahlekelwa kwamandla emishini kuneziguquguquko ezithile, amandla alinganisiwe wemoto ekhethiwe kufanele alingane noma abe mkhulu kancane kunamandla abaliwe.

Uma imotor kagesi ngamandla angu-0.8 akhethiwe, zama ukuthola ukuthi mangaki ama-kilowatt amandla emoto okufanele abe. Isixazululo: P=P1/n1n2=3.95/0.7*0.8=7.1kW Njengoba kungekho ukucaciswa kwe-7.1kW, kukhethwa injini ye-asynchronous enezigaba ezintathu engu-7.5kW.

2. Injini elinganiselwe ukusebenza kwesikhashana. Uma kuqhathaniswa nenjini enamandla alinganiselwe afanayo ngesikhathi sokusebenza okuqhubekayo. Izingxenye ezincane, i-torque enkulu enkulu, nentengo ephansi. Uma izimo zivuma, injini ye-asynchronous enezigaba ezintathu enesilinganiso esifushane se-S2 kufanele ikhethwe ngangokunokwenzeka.
3. Kumamotor ezigaba ezintathu asynchronous anesilinganiso sokusebenza kwezikhawu se-S3, khetha usayizi wokuphumayo. Ngokusho kobukhulu bezinga lomthwalo we-freewheeling, i-asynchronous motor enezigaba ezintathu enesistimu yokusebenza ye-S3 ikhethiwe, esetshenziselwa ngokukhethekile ukusebenza ngezikhathi ezithile. Ifomula yokubala yokulayisha u-Fs% ukuqhubeka ithi Fs%=tg/(Tg+kuya)×100%, lapho i-Tg iyisikhathi sokusebenza (iyunithi: iminithi), t itorque yokumiswa (iyunithi: min); Tg ten to isikhathi somjikelezo (iyunithi: min)

Indlela yesi-2: Sebenzisa indlela yokulingisa ukuze ukhethe amandla e-asynchronous motor enezigaba ezintathu. Okubizwa ngokuthi isifaniso, okuqhathaniswa nokusebenza kwe-asynchronous motor yezigaba ezintathu ezisetshenziswa emishinini yokukhiqiza efanayo.

Indlela eqondile yilena: qonda amandla asetshenziswa imishini yokukhiqiza efanayo eduze kwale yunithi noma amanye amayunithi, bese ukhetha amamotho aseduze ukuze asetshenziswe isilingo. Ukusebenza kwesilingo kuhloswe ukuhlola ukuthi injini ekhethiwe iyahambisana yini nomshini wokukhiqiza. Indlela yokuqinisekisa ithi: yenza i-hoist kagesi ishayele umshini wokukhiqiza ukuze usebenze. Sebenzisa i-ammeter ye-clamp ukuze ulinganise ukusebenza kwamanje kwe-asynchronous motor yezigaba ezintathu, futhi uqhathanise umphumela wokulinganisa nomthamo wamanje olinganiselwe oshiwo ku-nameplate yemoto.

Indlela yesi-3: Indlela yokuhlola ifanelekile:

1. Uma ukusebenza kwangempela kwe-motor kungaphambuki kakhulu kumanje wamanje obonisiwe. Lokhu kubonisa ukuthi ukusebenza kwemoto ekhethiwe kwanele.
2. Uma ukusebenza kwangempela kwemoto kucishe kube ngama-70% aphansi kunamanje akaliwe ashiwo ku-nameplate. Bese kukhombisa ukuthi amandla emoto aphakeme kakhulu (okungukuthi "inqola enkulu" kufanele ishintshwe injini enamandla aphansi).
3. Uma amandla asebenzayo enjini elinganisiwe angaphezulu kuka-40% ngaphezu kwamandla alinganisiwe ashiwo ku-nameplate. Lokhu kubonisa ukuthi amandla emoto aphansi kakhulu (okungukuthi "inqola encane"), okungukuthi, injini yamandla amakhulu kufanele ishintshwe.