Jagora Kafin Siyan Fuji11000vxB-170e-54 Igbt Module
2025-04-03 169

A 2MBBI1000vxb-170e-54 shine babban aiki na IGBT Module daga Fuji, da aka tsara don amfani da lantarki, inverters, da UPS.Yana haɗuwa da sauri sauyawa tare da ɗaukar hankali na yanzu, yana sa ya dace don aikace-aikacen masana'antu.Tare da 1700V voltage Rating da 1000a na yanzu iya, wannan module yana ba da ingantaccen aiki da kuma ingantaccen aiki.Wannan labarin yana ba da taƙaitaccen bayanin fasalinsa, fa'idodi, da abubuwan da ba za ku nemi kayan aikin inganci ba a cikin yawa.

Tsarin litattafai

2MBI1000VXB-170E-54

2MBI1000vxb-170e-54 bayanin

Da 2MBI1000vxb-170e-54 Shin an ƙira wani module na IGBT ta Fuji, wanda aka tsara don aikace-aikacen lantarki mai inganci.Ya haɗu da damar sauyawa na sauri na Mossuets tare da babban-halin yanzu da kuma low-saturation na transistors.

Waɗannan fasalin suna yin amfani da shi a cikin tsarin ƙarfin lantarki inda ake buƙatar sauya abubuwa masu inganci.Tare da kimar wutar lantarki na 1700V da karfin yau da kullun ya dace da neman aikace-aikacen masana'antu kamar kayayyakin motsa jiki (UPS).

Tsarinta mai ƙarfi yana tabbatar da karkatacciyar hanya a cikin mahalli mai girma, bayar da duka amincin aiki da inganci don aikace-aikacen masana'antu.Idan kana neman inganta ayyukan ka tare da kayan ingancin ingancin, la'akari da sayen 2MBBI1000vxb-170e-54 a cikin girma a yau don biyan bukatun kasuwancin ka.

2MBI1000vxb-170e-54 fasali

Babban saurin gudu - A module zai iya juyawa da sauri da sauri, yana sanya shi da kyau don tsarin da suke buƙatar tsari mai sauri, ingantaccen iko, kamar motsi da kayayyaki masu ƙarfi.

Drive na wutar lantarki - Yana aiki da kyau tare da tsarin da ke amfani da wutar lantarki mai ƙarfi, yana sauƙaƙa hadawa da ƙarin abin dogara.

Tsarin Ingancin Tsarin Tsarin Tsaro - Tsarin yana rage asarar iko kuma yana inganta inganci, yana nuna ya dace da tsarin da ke buƙatar canje-canje da sauri na yanzu.

2MBI10vxb-170e-50 Cirrit

2MBI1000VXB-170E-54 Circuit Diagram

A 2MBBIRXB -B-50EVXB-50ELURITY ya ƙunshi manyan sassan biyu: inverter da kuma imremistor.Sashin Inverter ya hada da abubuwa kamar manyan C1 (9), (11), ji na C1 (5), da ji C1 (4), da kuma ma'anar e2 (2).Waɗannan abubuwan haɗin suna aiki tare don sauya DC zuwa wutar AC kuma tabbatar da ingantaccen aiki.Abubuwan "hankali" suna lura da aikin mai shiga, yayin da G1 da G2 suna bauta a matsayin direbobi masufa don sarrafa na'urorin juyawa.Main C1 da C2e1 sune masu karfin gwiwa wadanda suke taimakawa tsayar da wutar lantarki da adana makamashi.Sashe na Armistor, mai taken kamar Th1 (7) da th2 (6), ana amfani dashi don saka idanu akan zafin jiki na da'ira.Idan zafin jiki ya wuce iyaka mai lafiya, waɗannan maganganun maganganu suna taimakawa kunna matakan kariya, tabbatar da tsarin yana aiki a cikin iyakokin zafi.Tare, waɗannan abubuwan haɗin suna tabbatar da ingantacciyar aiki da amincin module.

2MBI1000vxb-170e-54 matsakaitan ma'auni

Abubuwa
Alamomi
Yanayi
Matsakaitan ma'auni
Raka'a
Mai gidan yanar gizo
Mai karaya-Emritter
Vkyne
-
1700
V
Gate-Emitter
Vgwano
-
± 20
V
Mai tara a halin yanzu
Nic
M
Tc= 25 ° C
1400
A
Tc= 100 ° C
1000
Nic bugun jini
1ms
2000
-c

1000
-c bugun jini
1ms
2000
Mai karfin karfi
Мc
1 Na'ura
6250
W
Junction zazzabi
Tj
-
175
° C
Yin aiki da zazzabi
Tjop
-
150
Yanayin zazzabi
Tc
-
150
Zazzabi mai ajiya
Tna situka
-
-40 ~ +150
Warkewar kadada
Tsakanin tashar kwari da na ƙarfe (* 1)
Viso
AC: 1min
4000
Ya'ya
Tsakanin Mermistor da sauransu (2)
Dre Dre Drief Torque (* 3)
Hawa
-
M5
6.0
Nm
Babban tashar jiragen ruwa
M8
10.0
Tashar hankali
M4
2.1

SAURARA * 1: An haɗa dukkan tashar jiragen ruwa tare yayin gwajin.

SAURARA * 2: Ya kamata a haɗa tashar tashoshin da ke ciki guda biyu tare, ya kamata a haɗa wasu hanyoyin da aka haɗa tare kuma sun gajarta zuwa farantin tushe yayin gwajin.

SAURARA * 3: Kyauta da Shari'a: Haɗa 3.0 ~ 6.0nm (M5)

Darajar da aka ba da shawarar: manyan tashoshin 8.0 ~ 10.0nm (m8)

Darajar da aka ba da shawara: Tashar Shafi 1.8 ~ 2.1nm (M4)

2MBI1000vxb-170e-54 Halayen Wuta

Abubuwa
Alamomi
Yanayi
Halaye
Raka'a
min.
Tatomat.
max.
Mai gidan yanar gizo
Sifili ƙofar wutar lantarki mai ƙarfin lantarki
Nikyne
Vge = 0v, vkowace ce = 1700v
-
-
6.0
ma
Leaukar Liliter
Nigwano
Vkowace ce = 0v, vge = ± 20v
-
-
1200
na
Gilashin Emitin Mai Girma
VGE (th)
Vkowace ce = 20v, ic = 1000ma
6.0
6.5
7.0
V
Tattara-Emebar
Vce (Sat) (Terminal) (* 4)
Vge = 15v, ic = 1000a
Tj= 25 ° C
-
2.10
2.55
Tj= 125 ° C
-
2.50
-
Tj= 150 ° C
-
2.55
-
Tattara-Emebar
Vce (Sat) (CUTU)
Tj= 25 ° C
-
2.00
2.45
Tj = 125 ° C
-
2.40
-
Tj= 150 ° C
-
2.45
-
Inputara Capacitance (RG (Int))
Rg (int)
-
-
1.17
-
Ω
Inputara Inpacitance (Cies)
Cies
Vkowace ce = 10v, vge = 0v, f = 1mhz
-
94
-
nf
Lokaci-lokaci
ta kan
Vkowace ce = 900v, ici = 1000A
Vkowace ce = 15v
Rg= + 1.2 / 1.8ω
Ls = 60nh

-
1250
-
NSEC
tr
-
500
-
tr (i)

150

Lokacin kashe lokaci
tkatse lantarki
-
1500
-
tr
-
150
-
Gaba akan wutar lantarki
Vf(Terminal)
Vge = 0v, if = 1000a
Tj= 25 ° C
-
1.95
2.40
V
Tj= 125 ° C
-
2.20
-
Tj= 150 ° C
-
2.15
-
Vf(CUTU)
Tj= 25 ° C
-
1.85
2.30
Tj= 125 ° C
-
2.10
-
Tj= 150 ° C
-
2.05
-
Lokacin dawo da lokaci
m
Nif = 1000a
-
240
-
NSEC
M
Adawa
R
T = 25 ° C
-
5000
-
Ω
T = 100 ° C
465
495
520
B darajar
B
T = 25/20 ° C
330
3375
3450
Kr

SAURARA * 1: Da fatan za a koma zuwa shafi na 7, akwai ma'anar wutar lantarki a tashar terminal.

2MBI1000vxb-170e-54 tsayayya da halaye

Abubuwa
Alamomi
Yanayi
Halaye
Raka'a
min.
Tatomat.
max.
Jarurruwa mai tsauri (1 na'urar)
Rth (j-c)
Inverter IGBT
-
-
0.024
° C / W

Inverter Fwd
-
-
0.048
Tuntuɓi tsayayya da zafi (1 na'urar) (* 5)
Rth (C-f)
Tare da sararin zafi
-
0.0083
-

SAURARA * 5: Wannan ita ce ƙimar da aka ayyana hawa kan ƙarin ɗan sanyaya tare da sararin samaniya.

2MBI1000vxb-170e-54 ayyukan da aka yi

2MBI1000VXB-170E-54 Performance Curves

Hoton yana nuna hanyoyin motsa jiki na 2MBI1000vxb-170e-54 na Igbt module, wanda ke nuna alaƙar da ke tsakanin nazarin yanzu (Ic) da kuma mai karuwa-Eritter (Vkowace ce) A daban-daban-daban-daban-emitter (Vge) Don yanayin yanayin yanayi biyu na daban: 25 ° C (hagu) da 150 ° C (dama).

A zazzabi zazzabi na 25 ° C, curves sun nuna cewa mai tattarawa yana ƙaruwa da mafi girma kofa mai Emitter, musamman don Vge = 20v, inda module yake cimma matsakaicin ƙarfin sa.Aikin ya fara zama a ƙimar vace vace kuma yana nuna yankin tattake da halayyar halayyar kamar yadda mai tattarawa ya ƙaruwa.Babban ƙofofin ƙofa suna haifar da igiyoyin masu tattarawa mafi girma, amma tasirin yana farawa kamar yadda vce ya tashi sama da wani ƙafar.

A mafi girma zafin jiki zafi na 150 ° C, curves canzawa, yana nuna rage yawan mai tattarawa a cikin duka Vkowace ce dabi'u idan aka kwatanta da 25 ° C harka.Wannan halayyar ta hali ce ta na'urorin semiconductortor, kamar yadda aikin ya yi tare da hauhawar zafin jiki.Har yanzu ana iya ganin sakamako na jikewa, amma na yanzu yana ƙasa, yana nuna cewa tasirin da tasoshin suna iyakance ikon na'urar ta gudanar da kayan.Wannan yana canzawa a cikin yanayin zafi daban-daban yana ƙarfafa mahimmancin gudanarwa yayin tsara da'irar da ke cikin da'irar IGBT.

2MBI1000VXB-170E-54 Performance Curves

A cikin Farko Gra (hagu), mai tattarawa a halin yanzu (Ic) an makale a kan mai tattara wutar lantarki (Vkowace ce) A zazzabi daban uku: 25 ° C, 125 ° C, da 150 ° C.Kamar yadda tare da abubuwan da suka gabata, mun ga cewa mai tattarawa yana ƙaruwa mafi girma Vkowace ce yaushe Vge an gyara shi a 15V.A mafi girma yanayin yanayi, matsakaicin mai tattarawa na yanzu yana raguwa, wanda ke nuna lalata aikin kayan aikin saboda tasirin zafi.Wannan yana canzawa yana ba da mahimmancin la'akari da gudanarwar zafin jiki don ingantaccen aiki a aikace-aikacen lantarki.

Da Gicle na biyu (dama) Nuna v ariat ion ion (Vkowace ce) tare da ƙofar wutar lantarki (Vge) A matakin daban-daban daban-daban na yau da kullun (500A, 1000a, da 2000a).A madadin zafin jiki na yau da kullun na 25 ° C, da Vkowace ce saukad da kamar Vge Yana ƙaruwa, musamman a mafi girma matakan na yanzu.Wannan yana nuna halin hali na Igbts, inda mafi yawan kofa mai ƙarfin lantarki yana inganta ikon na'urar don gudanar da aikin na yanzu, ragewar vce ta hanyar wannan yanzu.Wadannan hanyoyin suna da mahimmanci don fahimtar ciniki tsakanin bukatun drive drive da mai tattarawa a cikin na'urar mai tattarawa a cikin aikace-aikacen babban aiki.

2MBI1000VXB-170E-54 Performance Curves

Da Graph yana nuna alaƙar da ke tsakanin kofarfarfar da wutar lantarki da masu tattarawa (Vkowace ce) na 2MBI1000vxb-170e-54 a 25 ° C.Yana shirya shigarwar shigarwar (Cies), karfin fitarwa (Coes), da kuma juyawa canja wuri (Cguduro) Kamar yadda ayyukan vce.Kamar yadda Vkowace ce yana ƙaruwa, duka biyun Coes da Cguduro rage, yayin Cies ya kasance da kwanciyar hankali.Wannan halin yana da hali ga igbts, inda ƙananan kayan aikin canja wuri a mafi girma voltages ke taimakawa haɓaka sauye sauye-sauye, wanda ake buƙata don aikace-aikacen inverter.

Da Graph Bala'i Halayyar Gate Haɗin Gate ta Gate (Vcs= 900v, ic= 1000a, tj= 25 ° C).Ya nuna yadda ƙarfin lantarki (Vge) da kuma mai karuwa-Eritter (Vkowace ce) bambanta tare da cajin ƙofar cajin (Qg).Kawasin yana bayyana bukatun cajin cajin yayin juyawa da kuma kashe abubuwan da suka faru.Da Vge Kwana yana nuna yankin Filato inda yawancin cajin ƙofar ke cinyewa a cikin Miller Tasirin, wanda ke tasiri kai tsaye canuddin sauri.Caurin Ofishin ƙofar gabaɗaya yana da kyau don cimma nasarar sauyawa da sauri tare da asarar takaita, yin wannan sigogi da ake buƙata lokacin zaɓi direba direba.

2MBI1000vxb-170e-54 Madadin

Abin ƙwatanci
Kimantawa
Rating na yanzu
Siffantarwa
FF1000R17IE4
1700v
1000a
Dual Igbt Module tare da Thinchestop ™ IGBT4 Fasaha, ingantawa don ƙarancin juyawa da kuma hawan keke iyawa.
Skm1000G17t4
1700v
1000a
Fasali mara nauyi da dakatarwa Asarar da asarar, ta dace da aikace-aikacen masana'antu mai inganci kamar mota Kulawa da masu kula da wuta.
CM1000du-24F
1200v
100A
Da aka sani da aminci aikin a Aikace-aikace kamar tsarin UPS, Inverters mai sabuntawa, da mota sarrafawa.
Vla2500-17.
1700v
250A
Wanda aka tsara don amfani dashi a cikin ikon wuta, Motar motoci, da sauran aikace-aikacen masana'antu suna buƙatar babban halin yanzu kulawa da inganci.
Hvigbt module x jerin
1700v - 4500v
455sa - 1200A
Yana ba da ƙarfi don Tsarin masana'antu da kayan aikin mota, musamman ga lantarki masu juyawa da masu sauya wuta.


Kwatantawa tsakanin 2MBI1000vxb-170e-54 da FF1000r17ie4

Siffa
2MBI1000vxb-170e-54
FF1000R17IE4
Kimantawa
1700v
1700v
Rating na yanzu
1000a
1000a
Hanyar sarrafa
Fasaha na IGBT
Fasaha ta Trenchestop ™ IGBT4 Fasaha
Nau'in module
Dual Igbt (Dual)
Dual Igbt (Dual)
Sauya mita
Babban sauyawa tare da ƙarancin asara
Babban sauyawa tare da ƙasa Sauya asara
Juriya na thermal
Lowerarancin jure zafin zafin jiki, an inganta shi don Hawan keke
Juriya mai tsauri, daɗaɗɗen ta ɗaukaka zafi wargi
Roƙo
Ya dace da motocin mota, UPS, Welding Injin, Inverters
Motar motocin masana'antu, kayayyakin wutar lantarki, da kuma masu shiga
Nau'in kunshin
Kai tsaye ɗaure jan ƙarfe (DBC)
Prodeopack ™ 4 fakiti
Sauya asara
Low Canjin Asarar
Ƙananan ƙarancin juyawa saboda Fasaha ta Trenchestops
Asarar
Asarar karancin asarar
Ingantawa don asarar karancin
Hanyar sanyaya
Dace da fitar da iska ko ruwan sanyi tsarin
Ya dace da sanyaya iska tare da babba aikin zafi
Tsarin Module
Myuɓi nau'in don aminci da sauƙi na haɗin kai
Rubuta nau'in aminci da sauki haɗin kai
Abin dogaro
Babban aminci ga masana'antu da Tsarin makamashi mai sabuntawa
Babban aminci ga masana'antu Aikace-aikace
Gajeriyar da'awar
Hadaddiyar kariyar da'awa siffa
Hadaddiyar kariyar da'awa
Yarjejeniyar Rohs
I
I
Aikace-aikace
Amfani a cikin ikon motsa jiki, inverters, Tsarin makamashi mai sabuntawa
Ainihin da aka yi amfani da shi a cikin lantarki na lantarki kamar motocin motoci da masu shiga


2MBI1000vxb-170e-54 fa'idodi da rashin amfani

Abbuwan amfãni na 2MBI1000vxb-170e-54

Babban aiki - A 2MBBI1000vxb-170e-54 an tsara don rage asarar kuzari tare da ƙarancin juyawa da asarar, yana dacewa da kayan lantarki wanda ke buƙatar haɓaka lantarki da ke buƙatar haɓaka wutar lantarki.

Abin dogaro na gaskiya - Yana aiki akai-akai a masana'antun makamashi da sabuntawa, yana ba da tsauri mai dawwama ko da mawuyacin yanayi.

Girman aiki - Stortan ƙaramin tsari yana adana sarari, yana sa sauƙi haɗin kai zuwa tsarin da yawa ba tare da ɗaukar ɗakuna da yawa ba.

Babban ƙarfin halin yanzu - Ilimin kulawa har zuwa 1000a na yanzu, wannan yanayin cikakke ne ga aikace-aikacen iko kamar ƙirar motar da kuma masu shiga.

Ingancin Tsarin zafi - Rashin juriya na ruwa mai rauni yana tabbatar da mafi kyawun zafi mai zafi, yana ba da damar da shi yayi aiki yadda yakamata a yanayin zafi.

Aikace-aikacen m aikace - Ana iya amfani dashi a cikin masana'antu da yawa, gami da ikon sarrafa motoci, injunan da ke ba da izini, da kuma hanyoyin shiga.

Rashin daidaituwa na 2MBI1000vxb-170e-54

LIMITEWARY VLATAGE - Tare da kimar 1700V, bazai dace da aikace-aikacen da suke buƙatar wutar lantarki ba, wajen iyakance amfani da tsarinta sosai.

Bukatun sanyaya - Kodayake yana da kyakkyawar sarrafawa mai kyau, har yanzu yana buƙatar babban sanyaya (kamar da iska ko ruwa da ruwa), wanda ke ƙara rikitarwa da farashi zuwa tsarin.

Girman don tsarin iko - Yayin da m, girman module yana iya zama koma baya a cikin tsarin da suke buƙatar ko da ƙarin iko ko a cikin sarari mai ƙarfi inda sababbi, ƙarin ci gaba na iya dacewa da kyau.

Babban farashi na farko - A matsayinka na babban aiki, 2MBI1000vxb-170e-54 ya zo ne a mafi tsada, sanya shi ƙasa da dace aikace-aikace-aikace-aikacen.

Lasali Canza Sau - Yana aiki da kyau a daidaitaccen sauyen mitocies, amma don aikace-aikacen miji mafi girma, ƙarfinsa na iya faɗi a bayan kayan sabbin hanyoyin da aka tsara musamman don sauya canzawa.

2MBI10VXB-170E-54 Aikace-aikace

Inverter don Motar Motar - Wannan sashin yana taimakawa injin sarrafawa ta hanyar canzawa DC zuwa ikon AC a AC a zahiri.Yana sa motoci gudana yadda suke tafe sosai a cikin injuna kamar magoya, farashinsa, da isarwa.

AC da dc servet drive amplifier - Ana amfani dashi a cikin tsarin Servo don sarrafa matsayin da saurin motsi.Wannan yana taimaka wa robots, injinan CNC, da kayan aikin atomatik suna aiki daidai.

Ba a kula da wutar lantarki ba (UPS) - A module yana ba da tsayayyen iko yayin blackouts.Yana kiyaye kayan aiki kamar kwamfyutoci, asibitoci, da masana'antu suna aiki ba tare da tsayawa ba.

Machines masana'antu (injunan welding) - Yana da girma ga injina kamar websers, inda karfi da tsayayyen igiyoyi ana buƙata.Yana taimaka wajen tsarkakakku da ingantaccen welds yayin samarwa.

2MBI1000vxB-170e-54 shirya maropions

2MBI1000VXB-170E-54 Packaging Dimensions

Bayyanawa na kunshin na 2MBI1000vXB-170E-54 yana nuna cikakken cikakken kayan aikin da kuma jagororin da ke haifar da daidaitattun kayan aiki don module.A module yana da tsawon tsayi na 250, nisa na 89.4, kuma tsawo na 38.4 mm, yana sanya shi dace da babban iko da ingantaccen shigarwa.Layin ya hada da ramuka da yawa, wuraren saukar da kewayawa, da kuma lakabin lakabi don tabbatar da daidaituwa daidai da shigarwa mai amintacce.

A module yana amfani da M8 da M4 na M4 na iko da tashoshin sarrafawa, tare da takamaiman dunƙule zurfafa (har zuwa 16 mm da 8 mm) don hana lalacewa yayin taro.Matsakaicin matsayi na ramuka na ginshi ana iya ƙayyade mu don taimaka mana samun cikakken daidaitawa akan heatsinks.Matsakaicin nauyin module yana kusa da gram 1250, wanda yake mai ma'ana don ƙarfin ƙarfin ƙarfin sa.Wannan ƙirar injiniyan ta tabbatar da hawa mai sauƙi, kyakkyawar lamba mai kyau, haɗin haɗin lantarki a masana'antun masana'antu da ikon lantarki.

2MBI1000vxb-170e-54 masana'anta

A 2MBBI1000VXB-170E-54 shine masana'antar IGBT ta Fuji Wutar lantarki, shugaba na duniya a cikin fasahar iko.An kafa shi a cikin 1923, Fuji Fuji kwararru ne a samar da mafita mai amfani a kan masana'antu kamar kuzari, sarrafa kansa da aiki, da sufuri.

Ƙarshe

A ƙarshe, 2MBI1000vxb-170e-54 Igbt module ta Fuji10 Igbt na Fuji10 Igbt yana ba da kyakkyawan aiki, ƙarfin aiki, da aikace-aikacen da aikace-aikacen masana'antu daban-daban.Idan kuna neman amintattun abubuwa, 2MBI1000vXB-170E-54 ya fito fili a matsayin mafi ƙa'idodi na lantarki wanda ke buƙatar dogaro da aikin na dogon lokaci da inganci.

Datasheet pdf

2MBI1000vxb-170e-54 datasets

2MBI1000vXB-170e-54.pdf
2MBI1000vxb-170e-54 details pdf
2MBI1000VXB-170E-54 PDF - DE.pdf
2MBI1000vXB-170e-54 PDF - FR.pdff
2MBI1000vxb-170e-54 PDF - ES.fff
2MBI1000vXB-170e-54 PDF - I.pdf
2MBI1000vxb-170e-54 PDF - Kr.pdf
GAME DA MU Gamsuwa da abokin ciniki kowane lokaci.Amincewar juna da bukatun juna. ARIAT Tech ta kafa dangantakar hadin gwiwa da kuma kafirai da masana'antu da yawa. "Kula da abokan ciniki da yin aiki da gaske", za a bincika duk ingancin gaske ba tare da matsaloli ba
Gwajin aikin.Mafi yawan kayayyaki masu tsada da kuma mafi kyawun sabis shine madadinmu na har abada.

Tambayoyi akai-akai [FAQ]

1. Menene darajar wutar lantarki na 2MBI1000vxb-170E-54?

Tsarin wutar lantarki shine 1700V.

2. Menene matsakaicin ƙarfin halin yanzu na 2MBI1000vXB-170E-54?

Zai iya ɗaukar har zuwa 1400A ci gaba a 25 ° C da 1000a a 100 ° C.

3. Yaya 2MBBI1000vxB-170E-54 inganta ƙarfin makamashi?

Matsayin yana rage asarar makamashi ta hanyar rage canzawa da asarar asarar, sanya shi da kyau don tsarin ingancin tsari.

4. Wace hanya ce mai sanyaya ga 2MBI1000vxb-170E-54?

Yana aiki mafi kyau tare da fitar da iska ko ruwa sanyaya don sarrafa zafi yadda ya kamata.

5. Ta yaya 2MBI1000vxb-170E-54 rike da babban yanayin zafi?

Tana da juriya na zafi na 0.024 ° C / W, wanda ke taimaka masa Sarrafa zafi kuma ya kasance mai inganci har ma a yanayin zafi.

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