防爆立式起重電機

串聯電(dian)(dian)(dian)(dian)(dian)抗器(qi)在電(dian)(dian)(dian)(dian)(dian)機(ji)啟(qi)(qi)動時由電(dian)(dian)(dian)(dian)(dian)抗器(qi)啟(qi)(qi)動，以限制和減少電(dian)(dian)(dian)(dian)(dian)機(ji)啟(qi)(qi)動時的(de)啟(qi)(qi)動電(dian)(dian)(dian)(dian)(dian)流和電(dian)(dian)(dian)(dian)(dian)壓(ya)降。當(dang)電(dian)(dian)(dian)(dian)(dian)機(ji)穩定(ding)，電(dian)(dian)(dian)(dian)(dian)流達到一定(ding)值時，切除(chu)的(de)反(fan)應器(qi)成為(wei)電(dian)(dian)(dian)(dian)(dian)機(ji)的(de)直接啟(qi)(qi)動方式。由于啟(qi)(qi)動過(guo)程(cheng)中電(dian)(dian)(dian)(dian)(dian)機(ji)側電(dian)(dian)(dian)(dian)(dian)壓(ya)也(ye)降低，容易導致啟(qi)(qi)動轉矩(ju)不足(zu)，啟(qi)(qi)動過(guo)程(cheng)中會有兩個(ge)沖擊過(guo)程(cheng)。

自(zi)耦(ou)變壓器的啟(qi)動(dong)是指電(dian)(dian)(dian)(dian)動(dong)機(ji)啟(qi)動(dong)時采(cai)用(yong)自(zi)耦(ou)變壓器來(lai)降低電(dian)(dian)(dian)(dian)機(ji)定(ding)(ding)(ding)子(zi)繞(rao)組(zu)的啟(qi)動(dong)電(dian)(dian)(dian)(dian)壓。電(dian)(dian)(dian)(dian)機(ji)啟(qi)動(dong)后，電(dian)(dian)(dian)(dian)機(ji)與自(zi)耦(ou)變壓器分離，在滿壓下正常運行。優點是可以根據(ju)允許的啟(qi)動(dong)電(dian)(dian)(dian)(dian)流和所需的啟(qi)動(dong)轉矩來(lai)選擇不同的自(zi)耦(ou)變壓器分接(jie)，無論(lun)電(dian)(dian)(dian)(dian)機(ji)定(ding)(ding)(ding)子(zi)繞(rao)組(zu)的定(ding)(ding)(ding)子(zi)繞(rao)組(zu)或電(dian)(dian)(dian)(dian)機(ji)定(ding)(ding)(ding)子(zi)繞(rao)組(zu)的三角(jiao)形連(lian)接(jie)都可以使用(yong)。缺點是設備的尺(chi)寸(cun)很大(da)，而且成本更(geng)貴。

可變電(dian)阻軟啟(qi)(qi)(qi)動(dong)包(bao)括熱電(dian)阻起動(dong)和液體(ti)電(dian)阻起動(dong)。主要(yao)是(shi)通過改變回路(lu)中的液體(ti)阻力來分擔局部壓(ya)降。隨著啟(qi)(qi)(qi)動(dong)時間的延長，可變電(dian)阻上的壓(ya)降減小，防爆電(dian)機順(shun)利(li)啟(qi)(qi)(qi)動(dong)。可變電(dian)阻啟(qi)(qi)(qi)動(dong)的啟(qi)(qi)(qi)動(dong)方(fang)式(shi)在啟(qi)(qi)(qi)動(dong)時較好，但不(bu)適合頻繁啟(qi)(qi)(qi)動(dong)。

防爆立式起重電機

起重電機(ji)產品在(zai)貯(zhu)存、運輸和(he)(he)使用過程中，經常受到周(zhou)圍環(huan)(huan)(huan)境(jing)(jing)(jing)(jing)(jing)的有害因素(su)的影(ying)響。YZR起重電機(ji)的特殊(shu)環(huan)(huan)(huan)境(jing)(jing)(jing)(jing)(jing)條(tiao)件(jian)，按產生環(huan)(huan)(huan)境(jing)(jing)(jing)(jing)(jing)因素(su)的性質，可分為天(tian)然氣候環(huan)(huan)(huan)境(jing)(jing)(jing)(jing)(jing)和(he)(he)工業(ye)環(huan)(huan)(huan)境(jing)(jing)(jing)(jing)(jing)兩大(da)類。天(tian)然氣候環(huan)(huan)(huan)境(jing)(jing)(jing)(jing)(jing)主要包(bao)括(kuo)熱帶、海洋、寒冷、地(di)下(xia)和(he)(he)高(gao)(gao)原環(huan)(huan)(huan)境(jing)(jing)(jing)(jing)(jing)；工業(ye)環(huan)(huan)(huan)境(jing)(jing)(jing)(jing)(jing)主要包(bao)括(kuo)腐蝕(shi)性環(huan)(huan)(huan)境(jing)(jing)(jing)(jing)(jing)、爆炸性環(huan)(huan)(huan)境(jing)(jing)(jing)(jing)(jing)、高(gao)(gao)低(di)溫、高(gao)(gao)低(di)壓、固體顆粒及粉塵、高(gao)(gao)能射線和(he)(he)特種(zhong)機(ji)械負荷(he)等(deng)環(huan)(huan)(huan)境(jing)(jing)(jing)(jing)(jing)。

1、勵(li)(li)磁(ci)(ci)(ci)電壓(ya)；是(shi)指加在勵(li)(li)磁(ci)(ci)(ci)繞(rao)(rao)組上，產生勵(li)(li)磁(ci)(ci)(ci)磁(ci)(ci)(ci)通的(de)電壓(ya)。對(dui)于(yu)zKF、zLF、zN而言(yan)，勵(li)(li)磁(ci)(ci)(ci)繞(rao)(rao)組均為轉子(zi)(zi)單相繞(rao)(rao)組；對(dui)于(yu)zKB勵(li)(li)磁(ci)(ci)(ci)繞(rao)(rao)組是(shi)定子(zi)(zi)繞(rao)(rao)組，其勵(li)(li)磁(ci)(ci)(ci)電壓(ya)是(shi)指加在定子(zi)(zi)繞(rao)(rao)組上的(de)大線電壓(ya)，它的(de)數(shu)值應均所對(dui)接的(de)自整角(jiao)發送機定子(zi)(zi)繞(rao)(rao)組的(de)大線電壓(ya)*。

2、輸(shu)(shu)出(chu)電(dian)壓(ya)：是(shi)指額定(ding)勵磁時，自(zi)整角機(ji)次級的大(da)線電(dian)壓(ya)。對(dui)(dui)于(yu)(yu)上述的發送機(ji)和(he)接收機(ji)均子繞組(zu)大(da)線電(dian)動勢(shi)(shi)；對(dui)(dui)于(yu)(yu)zKB，則指輸(shu)(shu)出(chu)繞組(zu)的大(da)電(dian)動勢(shi)(shi)。

3、空載電流(liu)和空載功(gong)率：指次(ci)級空載時，勵磁繞(rao)組的電流(liu)和消耗的功(gong)率。