Umhlinzeki wedivayisi yempendulo yokonga amandla ekheshi ukukhumbuza ukuthi isiguquli sefrikhwensi yekheshi iyithuluzi elikhethekile elisetshenziselwa ukulawula ikheshi. I-Elevator ethize ye-frequency converter ingumkhiqizo osezingeni eliphezulu phakathi kweziguquli zamandla amancane naphakathi nendawo, othuthukisa ukusebenza kahle kwe-lifti, isebenze kahle, futhi inwebe impilo yemishini. Ihlanganiswe ne-PLC noma i-microcomputer control, iphinde ibonise ukuphakama kokulawula ngaphandle kokuthinta: isifunda esenziwe lula, isilawuli esivumelana nezimo, ukusebenza okuthembekile, ukugcinwa okulula nokuqapha amaphutha. Indlela yokukhetha isiguquli sefrikhwensi esifanele sidlala indima ebalulekile kumakheshi.
1. Ukukhetha amandla
Ezinhlelweni zamakheshi, ezingu-7 zingakhethwa ngokusekelwe ezingeni lamandla angu-616G5 ama-frequency converters emininingwane ehlukahlukene efana no-5kW, 11kW, 15 kW, 18.5kW, 22kW, 30kW, njll., namayunithi okubhuleka akhelwe ngaphakathi angaphansi kuka-15kW kanye nama-DC ama-reactor angaphezu kuka-18.5k. Imvamisa, ezinhlelweni ze-elevator, iziguquli zemvamisa nazo zidinga ukukhethwa kwamayunithi okubhuleka nama-resistors amabhuleki; Kuyadingeka futhi ukulungisa ikhadi lejubane le-PG ukuthola isignali yempendulo yesivinini yesishumeki; Ama-reactors e-AC nawo ayadingeka ekusebenzeni isikhathi eside kwejeneretha nezinye izindawo ezikhethekile. Isiguquli sefrikhwensi sivame ukukhethwa ngokusekelwe ezingeni lokukhulisa amandla lemoto. Ukuze kuzuzwe ukusebenza kahle kokulawula kwesiguquli sefrikhwensi, amandla okuguqula imvamisa kufanele ahlangabezane nezidingo ezilandelayo:
1) Umthamo wesiguquli semvamisa kumele ube mkhulu kunokukhiphayo okudingwa umthwalo, okungukuthi:
2) Umthamo wesiguquli semvamisa awukwazi ukuba ngaphansi kwalowo wemoto, okungukuthi:
3) I-I0 yamanje yesiguquli semvamisa kufanele ibe nkulu kuneyamanje yenjini, okungukuthi:
4) Umthamo wesiguquli semvamisa ngesikhathi sokuqalisa kufanele uhlangabezane nefomula elandelayo:
Phakathi kwabo, i-P0N - ilinganiselwe amandla okukhipha i-frequency converter (kW);
I-I0N - Isilinganiso samanje se-converter frequency (A);
I-GD ² - Ukuguqulwa kwesiphetho se-motor shaft (N · m²);
TA - Isikhathi sokusheshisa (izinkathi); (Amanani angenhla anganqunywa ngokwezidingo zomthwalo);
I-K-current waveform compensation coefficient (ethathwe njengo-1.05~1.10 kumodi yokulawula ye-PWM);
I-torque yokulayisha ye-TL (N · m);
η - ukusebenza kahle kwezimoto (ngokuvamile kuthathwa njenge-0.85);
I-Cos φ - isici samandla we-motor (imvamisa ithathwa njenge-0 75);
Amandla okukhipha adingekayo we-motor shaft yomthwalo we-PM (kW);
I-IM motor rated current (A);
I-UN - I-voltage elinganiselwe yemoto kagesi (V);
I-NN - Isivinini esilinganiselwe semoto kagesi (r/min).
2. Ukukhethwa kwe-braking resistor
Ukukhethwa kwe-braking resistor kubaluleke kakhulu. Uma inani lokumelana le-resistor yokubhuleka likhulu kakhulu, i-torque yokubhuleka ngeke yanele. Uma inani lokumelana le-resistor ye-braking lincane kakhulu, i-braking current izoba nkulu kakhulu futhi i-resistor izoshisa, okunzima ukuyixazulula. Ezimweni lapho ukuphakama kokuphakamisa kukukhulu nesivinini semoto siphezulu, inani lokumelana le-resistor lingancishiswa ngokufanelekile ukuze kutholwe i-torque ephezulu yokubhuleka (inani elinconyiwe lokumelana ngokuvamile likhethwa njengo-120% we-torque yokubhuleka), kodwa inani lokumelana alikwazi ukuba ngaphansi kwenani elincane elishiwo umenzi. Uma inani eliphansi lingakwazi ukuhlangabezana ne-torque yokubhuleka, kuyadingeka ukufaka esikhundleni isiguquli sefrikhwensi ngezinga eliphezulu lamandla.
3. Ukukhethwa kokufaka amadivaysi empendulo okonga amandla kumakheshi
Indlela evamile yokuphatha le ngxenye yamandla kagesi kusikheshi sefrikhwensi eguquguqukayo ukufaka iyunithi yokubhuleka kanye ne-resistor yokubhuleka ekugcineni kwe-DC capacitor. Lapho i-voltage kuyo yonke i-capacitor ifinyelela inani elithile, iyunithi yokubhuleka izosebenza, futhi amandla kagesi engeziwe azoguqulwa abe amandla ashisayo ngesixhasi sokubhuleka futhi ahlakazeke emoyeni. Faka idivayisi yempendulo yokonga amandla ukuze amakheshi athathe indawo yeyunithi yokubhuleka kanye ne-braking resistor. Ngokuthola ngokuzenzakalelayo i-voltage yebhasi ye-DC yesiguquli sefrikhwensi, i-voltage ye-DC yesixhumanisi se-DC yesiguquli sefrikhwensi ihlehliswa ibe i-AC enefrikhwensi kanye nesigaba njenge-voltage yegridi. Ngemuva kwezixhumanisi eziningi zokuhlunga umsindo, ixhunywa kugridi ye-AC ukuze kuzuzwe izinjongo zokuluhlaza, ukuvikelwa kwemvelo, nokongiwa kwamandla.
Idivayisi yempendulo yokonga amandla yamakheshi iwukuguqula amandla kagesi akhiqizwe umshini wokudonsa wekheshi ngaphansi kwezimo zomthwalo ongalinganiseli kumandla wekhwalithi ephezulu we-AC wefrikhwensi efanayo nesigaba njengegridi yamandla, abuyiselwa kugridi yamandla wendawo. Izosetshenziswa kumabhodi omama wekheshi, izibani ze-elevator shaft, izibani zemoto, amafeni ezimoto, nezindawo eziseduze ezinemithwalo (noma amanye amakheshi ahambisanayo nemishini ehambisanayo).