單梁起重機的變頻調速

    單梁起重機的變頻調速

    變頻調速：其長處是能夠選用結構簡略、運yun轉zhuan牢lao靠kao的de單dan梁liang提ti高gao設she備bei的de溝gou通tong電dian機ji。雖sui然ran有you些xie溝gou通tong調tiao速su體ti係xi的de性xing能neng比bi直zhi流liu調tiao速su體ti係xi差cha，但dan能neng夠gou滿man意yi要yao求qiu。有you些xie起qi重zhong機ji的de價jia格ge很hen低di，所suo以yi隻zhi能neng選xuan用yong這zhe種zhong計ji劃hua。在zai各ge種zhong溝gou通tong調tiao速su計ji劃hua中zhong
，除chu了le雙shuang電dian機ji行xing星xing聯lian軸zhou器qi（或行星減速器），bianjibaochijiadian。danyouyuqizhongjigezuzhidisujielianyunzhuanshikejiaoduan
，qiezaihejiejinhengzhuanju，yincishangshuquedingdeyingxiangbingbumingxian。yinci
，zaidaduoshuqingkuangxiarengxuanyonggoutongtiaosu。

    起重機依據所需的行程組織和電動機完成的操控電器稱為行程限位開關。起重機機械附件行程限製器按用途分為終端開關（限位開關）和開關（維護開關）。zhongduankaiguanyongyujiangzuzhideyunzhuanxianzhizaibidingfanweinei，zhuangzhizaizuoyezuzhixingchengdemoduan。kaiguanshiyonglaiweihurende。liru
，congjiashishidaoshangzhuliangpingtaicangkoudekaiguanchengweicangkoukaiguan，yechengweimenhusuo。

    直流調速：在各種直流調速計劃中，直流串勵電動機選用定壓供電，直流電動機選用晶閘管供電調速，直流發電機-電動機體係選用直流調速。它們能夠削弱電動機的磁場，提高起重機輕載運轉速度。

    變頻調速的長處是：guozainenglida

，tiaosunenglida，heshipinfanfadonghezhidong，tixishiduanshao，tebieheshizhiliugongdianchanghe。xuanyongdanliangqizhongjidierhedisanzhongtiaosujihuadechangchushizaishangshenghuoxiajiang、電動或再生狀態下都能獲得滿意的動靜態特性，調速比大，能滿意頻繁起動和製動的要求。

    起(qi)重(zhong)機(ji)上(shang)各(ge)種(zhong)起(qi)重(zhong)機(ji)附(fu)件(jian)行(xing)程(cheng)限(xian)製(zhi)器(qi)的(de)終(zhong)端(duan)開(kai)關(guan)或(huo)開(kai)關(guan)的(de)內(nei)部(bu)接(jie)線(xian)和(he)外(wai)部(bu)尺(chi)度(du)不(bu)同(tong)，但(dan)其(qi)基(ji)本(ben)原(yuan)理(li)和(he)結(jie)構(gou)是(shi)相(xiang)同(tong)的(de)。它(ta)們(men)都(dou)有(you)一(yi)個(ge)密(mi)封(feng)的(de)鐵(tie)殼(ke)
，裏(li)麵(mian)有(you)許(xu)多(duo)常(chang)閉(bi)觸(chu)點(dian)。這(zhe)些(xie)觸(chu)點(dian)與(yu)鐵(tie)殼(ke)外(wai)的(de)活(huo)動(dong)連(lian)杆(gan)相(xiang)連(lian)。隻(zhi)需(xu)連(lian)杆(gan)因(yin)滑(hua)塊(kuai)碰(peng)撞(zhuang)而(er)移(yi)動(dong)

，內(nei)部(bu)常(chang)閉(bi)觸(chu)點(dian)就(jiu)會(hui)斷(duan)開(kai)，從(cong)而(er)堵(du)截(jie)電(dian)源(yuan)接(jie)觸(chu)器(qi)線(xian)圈(quan)，堵(du)截(jie)電(dian)源(yuan)進(jin)行(xing)維(wei)護(hu)。

    但與第二種方法比較，第三種方法存在體係慣性大、操控能力差、功率低、需xu求qiu旋xuan轉zhuan發fa電dian機ji組zu等deng缺que點dian
，其qi使shi用yong範fan圍wei受shou到dao限xian製zhi。但dan第di二er種zhong單dan梁liang提ti高gao裝zhuang置zhi計ji劃hua會hui發fa生sheng電dian網wang諧xie波bo汙wu染ran，超chao標biao後hou不bu能neng使shi用yong。綜zong上shang所suo述shu

，單dan梁liang起qi重zhong機ji直zhi流liu調tiao速su體ti係xi雜za亂luan，價jia格ge昂ang貴gui，但dan為wei了le滿man意yi調tiao速su、起製動
、運轉功率和節能的要求
，在某些場合不需求直流調速。

    qizhongjixianweiqiyouxingchengxianweikaiguanhezhichizucheng。yibanxuqiuxianchangzhuangzhi。zhuangzhishiliuyizhichihexianweikaiguandeweizhi。diandongshuangliangqizhongjimeitaiqizhongjipeibeilianggexingchengxianweikaiguanhelianggebiaochi。xianweikaiguanzhuangzhizaiyiduanliangdeliangtou，zhichifenbiezhuangzhizaixiangyingguijideliangtou。daoguishangyoudiaocheyidili，qichi、限位開關應與原吊車錯開，以保證限位的牢靠性。

    小車行程限位開關、尺(chi)的(de)裝(zhuang)置(zhi)視(shi)具(ju)體(ti)情(qing)況(kuang)而(er)定(ding)。上(shang)尺(chi)一(yi)般(ban)裝(zhuang)置(zhi)在(zai)小(xiao)車(che)架(jia)上(shang)，大(da)車(che)機(ji)械(xie)部(bu)件(jian)限(xian)位(wei)開(kai)關(guan)裝(zhuang)置(zhi)在(zai)橋(qiao)架(jia)上(shang)。裝(zhuang)置(zhi)行(xing)程(cheng)限(xian)位(wei)器(qi)時(shi)應(ying)考(kao)慮(lv)具(ju)體(ti)的(de)製(zhi)動(dong)間(jian)隔(ge)要(yao)求(qiu)
，行(xing)程(cheng)限(xian)位(wei)器(qi)與(yu)緩(huan)衝(chong)器(qi)之(zhi)間(jian)應(ying)留(liu)有(you)不(bu)小(xiao)於(yu)200mm的間隔，直至起重機或小車中止。