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              PLC企業資訊
                數顯溫控儀?EVK412P3庫存銷售
                發布者:shcczdhauto  發布時間:2019-10-11 13:42:15

                數顯溫控儀 EVK412P3庫存銷售


                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?炷欠N,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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                DOL-0803-W02MC
                DOL-0803-W05MC
                DOL-0803-W10MC
                DOL-0804-G02MC
                DOL-0804-G05MC
                DOL-0804-G10MC
                DOL-0804-W02MC
                DOL-0804-W05MC
                DOL-0804-W10MC
                DOL-1204-G02MC
                DOL-1204-G05MC
                DOL-1204-G10MC
                DOL-1204-W02MC
                DOL-1204-W05MC
                DOL-1204-W10MC
                DOL-1205-G02MC
                DOL-1205-G05MC
                DOL-1205-G10MC
                DOL-1205-W02MC
                DOL-1205-W05MC
                DOL-1205-W10MC
                DSL-8203-G0M6C
                DSL-8203-G02MC
                DSL-8203-B0M6C
                DSL-8203-B02MC
                DSL-8204-G0M6C
                DSL-8204-G02MC
                DSL-8204-B0M6C
                DSL-8204-B02MC
                DSL-1203-G0M6C
                DSL-1203-G02MC
                DSL-1203-B0M6C
                DSL-1203-B02MC
                DSL-1204-G0M6C
                DSL-1204-G02MC
                DSL-1204-B0M6C
                DSL-1204-B02MC
                DSL-1205-G0M6C
                DSL-1205-G02MC
                HN.IT3800
                SPIRALKABEL
                SPIRALKABEL
                SPIRALKABEL
                SPIRALKABEL
                LEITUNG,STEC/DOS
                LEITUNG,STEC/DOS
                LEITUNG,STEC/DOS
                SPIRALKABEL
                SPIRALKABEL
                SPIRALKABEL
                SPIRALKABEL
                SPIRALKABEL
                SPIRALKABEL
                SPIRALKABEL
                SPIRALKABEL
                SPIRALKABEL
                SPIRALKABEL
                SPIRALKABEL
                SPIRALKABEL
                SPANNUNGSABGREIFER
                LEITUNG,STEC/DOS
                HN.IT3900-12
                LEITUNG,STEC.GE.
                LEITUNG,DOSE
                LEITUNG,STEC.GE.
                LEITUNG,DOSE
                WS/WE100-N1232
                WS/WE100-P1232
                WS/WE100-N3230
                WS/WE100-P3230
                WS/WE100-N1239
                WS/WE100-N1439
                WS/WE100-P1239
                WS/WE100-P1339
                WS/WE100-P1439
                WS/WE100-N3239
                WS/WE100-N3439
                WS/WE100-P3239
                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

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