SS40E2-H3-12.5 DC24V下單快捷
變頻器在哪些情況下需要配制動電阻?
變頻器配制動電阻,主要是想通過制動電阻來消耗掉直流母線電容上的一部分能量,避免電容的電壓過高。理論上如果電容存儲的能量多,可以用來釋放出來驅動電機,避免能量浪費,但是電容的容量有限,而電容的耐壓也是有限的,當母線電容的電壓高到一定程度,就可能會損壞電容了,有些還可能損壞IGBT,所以需要及時通過制動電阻來釋放電,這種釋放,是白白浪費掉的,是一種沒有辦法的做法,請關注:容濟點火器
母線電容是個緩沖區,容納能量有限
三相交流電全部整流后,接入電容,滿載運行時候,母線正常的電壓大約是1.35倍,380*1.35=513伏,這個電壓當然會實時波動的,但是最低不能低于480伏,否則會欠壓報警保護。母線電容一般是兩組450V電解電容串聯而成,理論耐壓是900V,如果母線電壓超過這個值,電容會直接爆掉了,所以母線電壓是無論如何都不能達到900伏這么高壓的。
實際上,三相380伏輸入的IGBT的耐壓值是1200伏,往往要求工作在800伏以內,考慮到電壓如果升高,都會有個慣性問題,也就是你馬上讓制動電阻工作了,母線電壓也不會很快降低下來,所以很多變頻器,都是設計在700伏左右就通過制動單元讓制動電阻開始工作,讓母線電壓降低下來,避免往上繼續沖。
所以制動電阻設計,核心就是考慮到電容和IGBT模塊的耐壓問題,避免這兩大重要的器件被母線的高電壓沖壞掉了,這兩類元件如果壞掉了,變頻器也就無法正常工作了。
快速停車要制動電阻,瞬間加速也需要
變頻器母線電壓之所以會變高,很多時候是變頻器讓電機工作在電子制動狀態,讓IGBT通過一定的導通順序,利用電機是大電感電流不能突變,瞬間產生高壓來往母線電容充電,這時候讓電機快點降低速度下來。如果這時候沒有制動電阻及時消耗掉母線的能量,母線電壓將會持續變高而威脅變頻器的安全了。
如果負載不是很重,也沒有什么快速停車要求,這種場合是不需要使用制動電阻的,即使你裝了制動電阻,制動單元的工作閥值電壓沒有被觸發,制動電阻也不會投入工作。
除了大負荷減速場合需要增加制動電阻和制動單元來快速剎車外,實際上如果符合比較重,啟動時間時間要求非常快那種,也需要制動單元和制動電阻來配合啟動的,以往我試過用變頻器帶動一種特殊的沖床,要求把變頻器的加速時間設計成0.1秒,這時候滿負荷啟動,雖然負荷并不是非常重,但是因為加速時間太短了,這時候母線電壓波動非常厲害,也會出現過壓或者過流的情況,后來增加了外置的制動單元和制動電阻,變頻器就能正常工作了。分析起來,是因為啟動時間太短,母線電容的電壓瞬間被掏空了,而整流器瞬間有大的電流充進來,引起母線電壓突然變高,這樣母線的電壓波動太厲害,瞬間可能會超過了700伏,加上了制動電阻,就可以及時消除這個波動的高壓,讓變頻器工作在正常狀態。
還有一種特殊的情況,是矢量控制場合,電機的扭矩和速度方向相反,或者工作在零轉速百分百扭矩輸出的場合,比如吊機掉了重物停在半空中,收放卷場合需要力矩控制,都需要讓電機工作在發電機狀態,源源不斷的電流會反充到母線電容中,通過制動電阻,就可以及時消耗掉這些能量,保持母線電壓平衡穩定了.很多小變頻器,比如3.7KW的,往往都內置了制動單元和制動電阻,應該是考慮到母線電容調小的緣由吧,而小功率的電阻和制動單元并沒有那么貴。
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WS/WE100-P3439
WL100-N1232
WL100-N1332
WL100-N1432
WL100-P1232
WL100-P1332
WL100-P1432
WL100-N3230
WL100-N3430
WL100-P3230
WL100-P3430
WL100-N1239
WL100-N1439
WL100-P1239
WL100-P1439
WL100-N3239
WL100-N3439
WL100-P3239
WL100-P3339
WL100-P3439
WT100-N1432
WT100-P1432
WT100-N3430
WT100-P3430
WT100-N1439
WT100-P1439
WT100-N3439
WT100-P3439
LEITUNG,STEC/STEC
LEITUNG,STEC/STEC
LEITUNG,STEC/DOS
LEITUNG,DOSE
HN.IT3870
HN.BELT
LEITUNG,STEC/DOS
LEITUNG,STEC/DOS
WT100-N1412
WT100-P1412
WT100-N3410
WT100-P3410
WT100-N1419
WT100-P1419
WT100-N3419
WT100-P3419
SPIRALKABEL
UE23-2MF2D1
UE23-2MF2D3
UE23-2MF2A4
UE23-2MF2A3
I10-M0251
CM18-12NPP-KWD
CM18-08BNP-TW0
CM18-08BPP-TW0
HN.IT3800LX-13
HN.ST
HN.IT3875
HN.IT3875
HN.IT3875
HN.IT3875
HN.IT3875
HN.IT3875
HN.SPIRALKABEL
VT12T-2N112
VT12T-2N410
VT12T-2P112
VT12T-2P410
VT12T-2N132
VT12T-2N430
VT12T-2P132
VT12T-2P430
VL12-2N132
VL12-2N430
VL12-2P132
VL12-2P430
VS/VE12-2N132
VS/VE12-2N430
VS/VE12-2P132
VS/VE12-2P430
VS12-2D132
VS12-2D430
VE12-2N132
VE12-2N430
VE12-2P132
VE12-2P430
DSL-0803-G10MB
IM12-08NNS-ZWB
DOL-0803-G05MD
DOL-1203-G05MD
WE250-P440
WS/WE250-N142
WS/WE250-N440
WS/WE250-P142
WS/WE250-P145
WS/WE250-P440
WS/WE250-P440S04
HN.FW
STL-1205-G05MA
IM18-08NUS-ZUD
UM18-30010
UM18-40010
LEITUNG,DOSE
LEITUNG
LEITUNG,DOSE
LEITUNG,DOSE
LEITUNG,DOSE
LEITUNG,DOSE
HN.CAN
STECKER,ANB.ADERN
IM18-08BNS-ZWB
IM12-04NDS-ZWA
IM12-02BNO-ZWA
WF80-B4150S03
VORFUEHRKOFFER
IM12-02BNS-ZPX
IQ80-50BPP-KC0
VLL18T-4N3212
VLL18T-4N3240
VLL18T-4P3212
VLL18T-4P3240
SPIRALKABEL
HN.VERSACODE
T-VERTEILER
SPIRALKABEL
NETZGERAET
IM12-04NNS-ZWB
DOS-1204-GX
WLG190T-N112
WLG190T-N410
WLG190T-P112
WLG190T-P410
WTB190TL-N132
WTB190TL-N430
WTB190TL-P132
WTB190TL-P430
WTB190TL-N162
WTB190TL-N460
WTB190TL-P162
WTB190TL-P460
WTB190L-N132
WTB190L-N430
WTB190L-P132
WTB190L-P430
WTB190L-N162
WTB190L-N460
WTB190L-P162
WTB190L-P460
WL190L-N132
WL190L-N430
WL190L-P132
WL190L-P430
WS/WE190L-N132
WS/WE190L-N430
WS/WE190L-P132
WS/WE190L-P430
WE190L-N132
WE190L-N430
WE190L-P132
WE190L-P430
WLL190T-P030
WLL190T-N030
WLL190T-P430
WLL190T-N430
WLL190T-P330
WLL190T-N330
DOL-LL1903-02M
DOL-LL1901-02M
STE-WLL190-05P
STE-WLL190-03P
ADAPTERKABEL
HALTERUNG
WLL190T-P090
WLL190T-N090
WLL190T-P490
WLL190T-N490
WLL190T-P390
WLL190T-N390
DOL-1203-G05MG
DSL-1208-G01MB
LEITUNG
HN.IT4410
SPIRALKABEL
HN.HFSTAND4
SPIRALKABEL
HN.IT3800
HN.IT3800LX-11
LEITUNG
ISD300-5211
ISD300-5212
I100-MR0533
L40S-33MA2A
L40E-33MA2A
L40S-21KA1A
L40E-21KA1A
L40S-21MA1A
L40E-21MA1A
L40S-11MA1A
L40E-11MA1A
UE401-A0010
IM08-02BPS-ZWA
IM08-1B5PO-ZWA
I10-M0253
VTE18L-4P322
VTE18L-4P324
VTE18L-4N322
VTE18L-4N324
VTE18L-4P342
VTE18L-4P344
VTE18L-4N342
VTE18L-4N344
VL18L-4P322
VL18L-4P324
VL18L-4N322
VL18L-4N324