Masu samar da musanyar mitar mai ta musamman suna tunatar da ku cewa injinan lantarki a halin yanzu sune kayan aikin jujjuyawa da aka fi amfani da su. Tare da haɓakawa da kuma yaɗawar masu canza mitar, ana buƙatar ƙarin injinan lantarki da ake buƙatar amfani da su tare da masu sauya mitar. Duk da haka, a cikin tsarin amfani da na'urori masu sauyawa da na'urorin lantarki tare, babu makawa a fuskanci matsaloli masu yawa:
1. Shin masu farawa masu taushin motsi zasu iya adana makamashi?
Tasirin ceton makamashi na farawa mai laushi yana da iyaka, amma zai iya rage tasirin farawa akan grid na wutar lantarki, cimma farawa mai laushi, da kuma kare motsin motsi.
Bisa ga ka'idar kiyaye makamashi, saboda ƙari na ingantattun hanyoyin sarrafawa, farawa mai laushi ba wai kawai ya adana makamashi ba, amma yana ƙara yawan amfani da makamashi. Duk da haka, zai iya rage lokacin farawa na kewayawa kuma yana taka rawar kariya.
Menene farkon halin yanzu da farkon juzu'in motar yayin amfani da mai sauya mitar don aiki?
Yin amfani da mai sauya mitar don aiki, mita da ƙarfin lantarki suna ƙaruwa daidai da haɓakar motar, kuma farkon halin yanzu yana iyakance zuwa ƙasa da 150% na halin yanzu (125% ~ 200% dangane da samfurin). Lokacin farawa kai tsaye tare da samar da wutar lantarki, lokacin farawa shine sau 6-7, yana haifar da girgiza injiniyoyi da na lantarki. Yin amfani da faifan mai sauya mitar zai iya farawa lafiya (tare da tsawon lokacin farawa). Farawa na yanzu shine 1.2 ~ 1.5 sau da aka ƙididdigewa, kuma ƙarfin farawa shine 70% ~ 120% na ƙimar da aka ƙidaya; Don masu sauya mita tare da aikin haɓaka juzu'i ta atomatik, ƙarfin farawa yana sama da 100% kuma yana iya farawa da cikakken kaya.
Shin akwai wata alaƙa tsakanin jujjuyawar mota da gajeriyar kewayawa?
Akwai nau'ikan nau'ikan abin hawa guda biyu; daya Yana da nauyi fiye da na inji: nauyi ne da ke haifar da nauyin tukin da ya wuce kimar da aka ƙididdige shi ko tsarin watsawa da ke fuskantar cunkoso, wanda ba shi da alaƙa da ɗan gajeren zango,. 2. Na al'ada load: Idan motor halin yanzu yana da yawa fiye da kima, yana iya zama saboda gida grounding ko gajere da'ira tsakanin juya a cikin motor winding.
Menene aikace-aikacen ƙayyadaddun tsarin saurin mitoci? Menene amfanin?
Menene aikace-aikacen ƙayyadaddun tsarin saurin mitoci?
Ana iya amfani da shi ga injinan jujjuya tare da buƙatun ƙa'idodin saurin gudu.
Menene fa'idodin daidaita saurin mitoci?
Before the implementation of variable frequency speed regulation (theoretically, it had already been realized, but the actual implementation was after the invention of power electronic devices), traditional speed regulation used direct current. The disadvantages of direct current speed regulation are:
① DC motors have complex structures and high maintenance costs
② Due to the existence of the commutator, there is not much room for increase in the power of the DC motor.
Therefore, the benefits of variable frequency speed regulation are:
① It can achieve the same excellent speed regulation performance as DC speed regulation for AC motors.
② The maintenance of squirrel cage asynchronous motors is simple and convenient.
③ There is no limitation on the power of AC motors due to the commutator.
How to measure the insulation resistance of a motor?
If it is a three-phase AC motor, measure the insulation resistance between phases and to ground of the motor's three-phase windings.
If it is a DC motor, measure the motor armature winding to ground, series excitation winding to ground, secondary excitation winding to ground, and series excitation winding to secondary excitation winding. Select the corresponding shaker according to the voltage level of the tested motor.
Measurement steps:
---Disconnect the power supply
---Ground discharge
---If it is a three-phase AC motor, open the center point (if possible)
---If it is a DC motor, lift the brush.
---Use a shaking table to measure the insulation resistance between phases and to ground separately
---Ground discharge
---Restore the line
---Record the insulation resistance and ambient temperature.
6. What is a brushless and acyclic starter?
Brushless and Ringless Starter is a starting device that overcomes the disadvantages of wound asynchronous motors equipped with slip rings, carbon brushes, and complex starting devices, while retaining the advantages of low starting current and high starting torque of wound motors. JR, JZR, YR, and YZR three-phase wound rotor AC asynchronous motors (except for variable speed and those equipped with input cameras) that originally used resistance starters, reactors, frequency sensitive variable resistors, liquid variable resistor starters, and soft starters can be replaced with "brushless and open-loop starters".
How many capacitor starting methods are there for motors?
There are two types of starting:
⑴ Capacitor starting (refers to the disconnection of the capacitor after the motor is started);
⑵ The capacitor starts and operates (the capacitor participates in operation after starting).
Can a transformer be used as a load for a frequency converter?
A ka'ida, ya kamata ya yiwu, amma ba aiki a aikace ba. Masu juyawa ba sa buƙatar masu canza wuta don haɓaka ƙarfin lantarki, kuma yakamata a sami nau'ikan da za a iya amfani da su don kewaya sama da 380V. Idan ana buƙatar ƙarin ƙarfin lantarki, akwai kuma na'urorin da za a iya canza su kai tsaye zuwa 220V ko 380V sannan su ninka ƙarfin lantarki don samun babban ƙarfin lantarki. Ana amfani da masu canza mitoci galibi don tuƙi (kamar injinan lantarki) kuma ba a cika amfani da su ba don sauya mitar wutar lantarki. Ayyukan masu sauya mitar sun yi nisa daga iyakancewa zuwa mitar jujjuya kanta, kuma akwai ƙarin ayyuka da yawa kamar kariya iri-iri. Idan ana amfani da masu sauya mitar don samun ƙarfin jujjuya mitar, bai dace ba ta fuskar tattalin arziki. Ana ba da shawarar yin amfani da wasu da'irar juyawa mitar.
Za a iya daidaita mai sauya mitar zuwa 1Hz, kuma Hz nawa ne za a iya daidaita shi don amfani?
Idan ana amfani da mai sauya mitar akan babban motar AC asynchronous, lokacin da aka daidaita mai sauya mitar zuwa 1Hz, ya riga ya kusa DC, wanda ba a yarda da shi ba. Motar za ta yi aiki a matsakaicin halin yanzu a cikin iyakar mitar, kuma motar za ta haifar da zafi mai tsanani, wanda zai iya ƙone motar.
Idan aikin ya wuce 50Hz, zai ƙara asarar ƙarfe na motar, wanda kuma yana da lahani ga motar. Gabaɗaya, yana da kyau kada ku wuce 60Hz (haɓaka shi a cikin ɗan gajeren lokaci an yarda), in ba haka ba kuma zai shafi rayuwar sabis ɗin motar.
Menene ka'idar aiki na mai jujjuya ƙa'idar mitar a cikin mai sauya mitar? Me yasa daidaita juriya zai iya canza mitar?
Ana amfani da resistor daidaita mitar mai sauya mitar don raba daidai gwargwado na 10V na mai sauya mitar, sannan a mayar da shi zuwa babban allon sarrafa mitar mai sauya mitar. Daga nan sai babbar hukumar sarrafa mitar mitar ta yi canjin analog-zuwa-dijital akan ƙarfin lantarki da resistor ya mayar da shi don karanta bayanan, sannan ya canza shi zuwa ƙimar mitar mitar da ake ƙima don fitar da mitar na yanzu. Don haka, daidaita ƙimar resistor na iya daidaita mitar mai sauya mitar.
11. Shin mai sauya mitar zai iya lalata motsin motar?
Za a iya raba jujjuyawar mitar? Ba zan iya ba! Amma idan dai saurin fitarwa f da saurin daidaitawa n1 suna kiyaye ƙimar zamewa a cikin tsayayyen kewayon ko ƙididdige ƙimar zamewar Se, yana daidai da ƙaddamar da motsin motsi, saboda ma'aunin wutar lantarki yanzu shine 1, kuma rotor current shine ƙarfin halin yanzu wanda kowa yana buƙatar decouple da sarrafawa! Mai jujjuya mitar na'urar sarrafa saurin gudu don injinan asynchronous, kuma ba zai iya yin kowane iko fiye da halayen injina na injina asynchronous.
Me yasa girman halin yanzu yake da girma lokacin fara injin induction? Shin halin yanzu zai ragu bayan farawa?
Lokacin da induction motor ke cikin yanayin tsayawa, daga hangen nesa na lantarki, yana kama da wuta. Wutar lantarki da aka haɗa da wutar lantarki tana daidai da naɗaɗɗen farko na na'urar, kuma rotor winding a cikin rufaffiyar da'irar daidai yake da na'ura ta biyu na na'urar ta atomatik wanda ke da gajeriyar kewayawa; Babu haɗin lantarki tsakanin iskar stator da na'ura mai juyi, haɗin maganadisu kawai. Juyin maganadisu yana wucewa ta cikin stator, tazarar iska, da rotor core don samar da rufaffiyar da'ira. A lokacin rufewa, har yanzu na'urar rotor bai fara juyawa ba saboda rashin aiki, kuma filin maganadisu mai jujjuya yana yanke iska mai jujjuyawa a matsakaicin saurin yanke - saurin daidaitawa, yana haifar da jujjuyawar rotor don haifar da mafi girman yuwuwar yuwuwar. Saboda haka, wani babban motsi yana gudana ta hanyar madubin rotor, wanda ke haifar da makamashin maganadisu don magance filin maganadisu na stator, kamar dai yadda na'urar maganadisu ta biyu ke bukatuwa don ta'ammali da firamare na farko.
Domin kiyaye ainihin juzu'in maganadisu wanda ya dace da ƙarfin wutar lantarki, stator yana ƙaruwa ta atomatik. Saboda halin yanzu na rotor yana da girma sosai a wannan lokacin, ma'aunin stator shima yana ƙaruwa sosai, har zuwa sau 4-7 na ƙimar halin yanzu, wanda shine dalilin haɓaka halin yanzu.
Me ya sa na yanzu ya yi ƙanƙanta bayan farawa: Yayin da motsin motar ke ƙaruwa, saurin da filin maganadisu na stator ya yanke na'ura mai juyi yana raguwa, ƙarfin da aka haifar a cikin na'ura mai juyayi yana raguwa, kuma na yanzu a cikin na'urar rotor shima yana raguwa. Saboda haka, bangaren stator current da ake amfani da shi don kashe karfin maganadisu da rotor current ya haifar shima yana raguwa, don haka stator current yana raguwa daga babba zuwa karami har sai ya dawo daidai.
Menene tasirin mitar mai ɗaukar hoto akan mitar masu juyawa da injina?
Mitar mai ɗaukar kaya yana da tasiri akan abin da ake fitarwa a halin yanzu na mai sauya mitar:
(1) Mafi girman mitar aiki, mafi girman aikin da'awar wutar lantarki, ƙarami mafi girma na abubuwan jituwa na halin yanzu, wato, mafi girman mitar mai ɗauka, kuma mafi santsi na halin yanzu;
(2) Mafi girman mitar mai ɗauka, ƙarami da izinin fitarwa na yanzu na mai sauya mitar;
(3) Mafi girman mitar mai ɗaukar kaya, ƙaramar ƙarfin ƙarfin ƙarfin na'urar wiring capacitor (saboda Xc=1/2 π fC), kuma mafi girman ɗigogi na halin yanzu da ke haifar da matsanancin bugun jini.
Tasirin mitar mai ɗaukar kaya akan injina:
Mafi girman mitar mai ɗaukar kaya, ƙarami da girgizar motar, ƙaramar ƙarar aiki, da ƙarancin zafi da injin ke haifarwa. Amma mafi girman mitar mai ɗaukar hoto, mafi girman mitar halin yanzu, mafi girman tasirin fata na stator, mafi girman asarar motar, kuma ƙarancin ƙarfin fitarwa.
Me ya sa ba za a iya amfani da na'ura mai jujjuya mita azaman wutar lantarki mai sauya mitar ba?
Gaba dayan da'irar wutar lantarki mai canzawa ta ƙunshi AC DC, AC, da sassa masu tacewa, don haka ƙarfin lantarki da na yau da kullun da yake fitarwa sune tsattsauran raƙuman ruwa, waɗanda ke kusa da ingantaccen wutar lantarki na AC. Yana iya fitar da wutar lantarki da mitar kowace ƙasa a duniya.
Kuma mai sauya mitar ya ƙunshi madauri irin su AC straight current da AC (modulated wave), kuma daidaitaccen sunan mai sauya mitar ya kamata ya zama mai sarrafa saurin mitar. Siffar igiyar wutar lantarkin da yake fitarwa ita ce igiyar murabba'in bugun jini tare da abubuwan haɗin kai da yawa. Wutar lantarki da mitar suna canzawa daidai gwargwado a lokaci guda kuma ba za a iya daidaita su daban ba, wanda bai dace da buƙatun wutar lantarki ta AC ba. A ka'ida, ba za a iya amfani da shi azaman samar da wutar lantarki ba kuma ana amfani dashi gabaɗaya don daidaita saurin injunan asynchronous mataki uku.
Me yasa hawan zafin injin ya fi girma yayin amfani da mai sauya mitar fiye da mitar wutar lantarki?
Domin yanayin fitar da mitar mai canza mitar ba igiyar sine ba ce, amma karkatacciyar igiyar igiyar ruwa ne, injin da yake a halin yanzu da ake ƙididdige shi yana da kusan 10% sama da wanda yake a mitar wutar lantarki, don haka hawan zafin jiki ya ɗan yi sama da haka a mitar wutar lantarki.
Wani batu kuma shi ne, lokacin da motsin motar ya ragu, saurin fanka mai sanyaya motar bai isa ba, kuma yanayin zafin motar zai kasance mafi girma.