AS-HDTA-201C
AS-HDTA-201CAS-HDTA-201C制動(dòng)電阻的作用
在變頻調(diào)速系統(tǒng)中,電機(jī)的降速和停機(jī)是通過(guò)逐漸減小頻率來(lái)實(shí)現(xiàn)的,在頻率減小的瞬間,電機(jī)的同步轉(zhuǎn)速隨之下降,而由于機(jī)械慣性的原因,電機(jī)的轉(zhuǎn)子轉(zhuǎn)速未變。當(dāng)同步轉(zhuǎn)速小于轉(zhuǎn)子轉(zhuǎn)速時(shí),轉(zhuǎn)子電流的相位幾乎改變了180度,電機(jī)從電動(dòng)狀態(tài)變?yōu)榘l(fā)電狀態(tài);與此同時(shí),電機(jī)軸上的轉(zhuǎn)矩變成了制動(dòng)轉(zhuǎn)矩,使電機(jī)的轉(zhuǎn)速迅速下降,電機(jī)處于再生制動(dòng)狀態(tài)。電機(jī)再生的電能經(jīng)續(xù)流二極管全波整流后反饋到直流電路。由于直流電路的電能無(wú)法通過(guò)整流橋回饋到電網(wǎng),僅靠變頻器本身的電容吸收,雖然其他部分能消耗電能,但電容仍有短時(shí)間的電荷堆積,形成“泵升電壓”,使直流電壓升高。過(guò)高的直流電壓將使各部分器件受到損害。
【公 司】: 廈門(mén)泰尼電氣有限公司
【主 營(yíng)】: AB、GE、施耐德等各類(lèi)PLC產(chǎn)品
【價(jià) 格】: 電議
【發(fā)布人】: 張亮
【電 話(huà)】: 18030028083
【所在地】: 福建 - 廈門(mén)
【座 機(jī)】: 0592-6809819
【來(lái) 源】: 供應(yīng)信息 > 電工、電氣 > PLC
【Q Q】: 2314094943
PowerDsine PD-AS-401/5 POE SPLITTERS LOT OF 14 NEW
HUAWEI RT-SIC-2FXO 2 PORT VOICE INTERFACE MODULE NEW
HUAWEI QUIDWAY S2403H SWITCH 24 PORT S2000 SERIES NEW
HUAWEI RT-SIC-1BS 1PORT ISDN BRI S/T INTERFACE CARD NEW
IMEDIA S25-7000142 INPUT DVB-ASI PCI CARD
3COM 3C16970 100BASE-FX FIBER MODULE
HUAWEI QUIDWAY S1024 SWITCH 24 PORT S1000 SERIES NEW
HUAWEI RT-SIC-1E1-F 1x E1 INTERFACE SIC E1-F CARD NEW
HUAWEI AOLYNK DR814 ADSL2+ BROADBAND ROUTER BRAND NEW
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CNT LCP4E-40 PROCESSOR MODULE 20501490 CHL-NAU 5401
LANNET LE-25/ST FIBER OPTIC TRANSCEIVER NEW LOT OF 17
HUAWEI 3COM SFP-GE-SX-MM850-A 1000BASE-SX SFP LOT OF 2
GILAT AN-3434-10 ODU C-BAND 5 WATT XCVR + LN345010
CNT EDC1 INTERFACE MODULE 20501410 CHL-NAU 5401
GILAT AN-0036-10 XKU-BAND ODU TRANSMITTER AN0036-10
CNT EIM3 INTERFACE MODULE 20501330 CHL-NAU 5401
HUAWEI QUIDWAY S1024 SWITCH 24 PORT S1000 SERIES
GILAT AN-3458-10 C-BAND ODU TRANSCEIVER AN-345810
GILAT AN-3433-10 KU-BAND 2 W ODU TRANSCEIVER NJT5051D
LUCENT ORiNOCO PD-PH-4006/AC/48 6 PORT DC INJECTOR NEW
CNT HSP3 INTERFACE MODULE 20501316 CHL-NAU 5401
PowerDsine PD-PH-4006/AC/48 POWER OVER LAN HUB NEW
CNT HSSI DTE INTERFACE MODULE 20501152 CHL-NAU 5401
CAVIUM NETWORKS CN1005 NITROX XL NHB SSL CARD CN 1005
CNT BRAM3 MEMORY MODULE 20501212 CHL-NAU 5401
CHAPARRAL K5312 EXTERNAL RAID BOARD CONTROLLER 8K53
HP CA245-03790 X-RITE DTP24GRH+ IN CARRIAGE ILD LP1 NEW
CNT DRB1 RAM MODULE 20501312 CHL-NAU 5401
GILAT AN-3429-10 2 W KU-BAND ODU TRANSCEIVER NJT5052D
CAVIUM NETWORKS CN-PC1000 NITROX PRODUCATION SSL BOARD
IBM 07N6831 36.7GB 68 PIN ULTRA3 15K RPM SCSI DRIVE
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HP E1411B 5 1/2 75000 SERIES C DIGIT MULTIMETER VXI
GILAT SKYEDGE IP VSAT DVB 542000 VERSION 6.0
DUNEGAN / ENDEVCO EXT MEMORY MODEL 922
DUNEGAN / ENDEVCO DUAL AMPLIFIER MODEL 302A
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VAT 24328-KA41-0001 VACUUM ANGLE VALVE MINT CONDITION
DUNEGAN / ENDEVCO MODEL 934
MANOSTAR YAMAMOTO TYPE MS65L PRESSURE SWITCH NEW
VACUUM BARRIER CORPORATION LDC-1002
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CNT LCP4LX PROCESSOR MODULE 20501191 CHL-NAU 5401
DUNEGAN / ENDEVCO RESET CLOCK MODEL 402
DUNEGAN / ENDEVCO PARAMETRIC METER MODEL 935
GILAT AN-3470-10 XKU-BAND ODU TRANSCEIVER 2W NJT5061M
DUNEGAN / ENDEVCO AMPLITUDE DETECTOR MODEL 921
RACAL INSTRUMENTS 1260-35 MULTIPLEXER VXI MODULE
NORGREN SUPER X SPOOL VAVLE 2-10 BAR 03 0418 02 801 NEW
FESTO DG-6-25 ROUND CYLINDER 2456 NEW LOT OF 34
AIRSPAN MARCONI WipLL SPR 3.5GHZ INT FDD PN:09000004
JAI PULNiX CV-M1250K MICRO HEAD CCD CAMERA C