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公司名稱:廈門興銳達自動化設(shè)備有限公司
本公司專業(yè)銷售大型進口各種品牌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】【進口原裝】【拆包防偽】
【超大庫存】【當天付款】【順豐速運】【歡迎搶購】
在通常電動機的制動進程中,電動機先減速,電動機同步旋轉(zhuǎn)磁場轉(zhuǎn)速低于轉(zhuǎn)子轉(zhuǎn)速,作業(yè)點在同一轉(zhuǎn)速下由曲線①的A點跳至曲線②的B點,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),則電機得到反方向的制動轉(zhuǎn)矩T進入發(fā)電制動狀況,拖動體系沿圖1中曲線②敏捷降速,當?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)作制動轉(zhuǎn)矩。在這一進程中,電機將通過再生發(fā)電制動和能耗制動而終究中止。
從理論上剖析,假如能夠操控電動機同步磁場的轉(zhuǎn)速緩慢下降,使電動機在同一轉(zhuǎn)速下特性跳轉(zhuǎn)時,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)至第二象限則拖動體系在降速進程中能夠有用的防止發(fā)作再生制動進程。如圖1所示,當電機轉(zhuǎn)速在小于臨界轉(zhuǎn)速nh的狀況下接入直流進行制動,并相應操控接入直流的巨細和時刻,理論上剖析電機只經(jīng)歷有限的能耗制動期間,不會過熱。而變頻器杰出的內(nèi)、外特性能夠確保上述各項條件的滿意。
廈門興銳達自動化設(shè)備有限公司
聯(lián)系人:劉錦玲 銷售經(jīng)理
熱 線:0592-5361112
手 機:15359273791
QQ: 2859249356
EMAIL:2859249356@qq.com
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