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公司名稱:廈門興銳達(dá)自動(dòng)化設(shè)備有限公司
本公司專業(yè)銷售大型進(jìn)口各種品牌DCS系統(tǒng)模塊備件:
ABB Advant OCS,ABB MOD 30/MODCELL,ABB MOD 300,ABB Bailey INFI 90,
ABB Procontic,ABB Procontrol,
H&B Contronic,Moore APACS,Moore Panel Controllers,Rosemount RS-3,
Siemens Iskamatic,Siemens Simatic S5,Siemens Simatic C1,
Yokogawa Centum XL,Yokogawa microXL,
FOXBORO I/A,GE FANUC,
Honeywell QCS,Honeywell TDC系列,Honeywell S9000,
【誠信經(jīng)營】【質(zhì)量可靠】【進(jìn)口原裝】【拆包防偽】
【超大庫存】【當(dāng)天付款】【順豐速運(yùn)】【歡迎搶購】
在通常電動(dòng)機(jī)的制動(dòng)進(jìn)程中,電動(dòng)機(jī)先減速,電動(dòng)機(jī)同步旋轉(zhuǎn)磁場轉(zhuǎn)速低于轉(zhuǎn)子轉(zhuǎn)速,作業(yè)點(diǎn)在同一轉(zhuǎn)速下由曲線①的A點(diǎn)跳至曲線②的B點(diǎn),即從榜首象限過渡到第二象限稱之為同一轉(zhuǎn)速下特性的跳轉(zhuǎn),則電機(jī)得到反方向的制動(dòng)轉(zhuǎn)矩T進(jìn)入發(fā)電制動(dòng)狀況,拖動(dòng)體系沿圖1中曲線②敏捷降速,當(dāng)?shù)陀谀骋晦D(zhuǎn)速后,向定子繞組輸入直流,構(gòu)成固定磁場,發(fā)作制動(dòng)轉(zhuǎn)矩。在這一進(jìn)程中,電機(jī)將通過再生發(fā)電制動(dòng)和能耗制動(dòng)而終究中止。
從理論上剖析,假如能夠操控電動(dòng)機(jī)同步磁場的轉(zhuǎn)速緩慢下降,使電動(dòng)機(jī)在同一轉(zhuǎn)速下特性跳轉(zhuǎn)時(shí),特性曲線維持在榜首象限,如圖1中虛線組③所示緩慢降速,不跳轉(zhuǎn)至第二象限則拖動(dòng)體系在降速進(jìn)程中能夠有用的防止發(fā)作再生制動(dòng)進(jìn)程。如圖1所示,當(dāng)電機(jī)轉(zhuǎn)速在小于臨界轉(zhuǎn)速nh的狀況下接入直流進(jìn)行制動(dòng),并相應(yīng)操控接入直流的巨細(xì)和時(shí)刻,理論上剖析電機(jī)只經(jīng)歷有限的能耗制動(dòng)期間,不會(huì)過熱。而變頻器杰出的內(nèi)、外特性能夠確保上述各項(xiàng)條件的滿意。
廈門興銳達(dá)自動(dòng)化設(shè)備有限公司
聯(lián)系人:劉錦玲 銷售經(jīng)理
熱 線:0592-5361112
手 機(jī):15359273791
QQ: 2859249356
EMAIL:2859249356@qq.com
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