摘要：以往對(duì)于交流異步電動(dòng)機(jī)的幾種調(diào)速方式，調(diào)速范圍小，是有級(jí)調(diào)速，在低速時(shí)的轉(zhuǎn)矩小，直接影響了實(shí)際生產(chǎn)工作。隨著社會(huì)的進(jìn)步，電力電子技術(shù)的發(fā)展，變頻技術(shù)普遍應(yīng)用于電力拖動(dòng)領(lǐng)域，時(shí)耗能較大的設(shè)備實(shí)行變頻調(diào)速，取得了明顯的節(jié)能效果。而起重機(jī)采用變頻調(diào)速，替代傳統(tǒng)的凸輪控制器變阻調(diào)速的控制方法，充分發(fā)揮了其優(yōu)越的性能。 關(guān)鍵詞：橋式起重機(jī)；變頻器；凸輪控制器；轉(zhuǎn)差率 [b][align=center]Reconstruction and application of converter for bridge crane Li Zhi—wei （Foshan Mechanical School。Fosha n 528O0o，China）[/align][/b] Abstract：As the development of the society and electronic technology，frequency technigue is widely applicated in the area of electrical power draging．Frequency control is progressed in some devices consumed more power，which achieves the obvious efects in economizing power．Meanwhile，adopting frequency control insteads the resi～tance control of traditional canl controler which adequately shows its superiority． Key words：bridge crane；convener；cam controler；slip ratio 1 負(fù)載的特點(diǎn) 傳統(tǒng)的QD型橋式雙梁起重機(jī)電氣傳動(dòng)系統(tǒng)的大、小走車的凸輪控制器變阻調(diào)速采用凸輪控制器內(nèi)部觸點(diǎn)的開合方式來增加或減少連接于繞線式電機(jī)轉(zhuǎn)子電阻器的電阻量大小來改變電機(jī)轉(zhuǎn)速的一種調(diào)速方式，實(shí)際上是通過改變電機(jī)的轉(zhuǎn)差率進(jìn)行調(diào)速的，如圖l所示。 [b][align=center]詳細(xì)內(nèi)容請(qǐng)點(diǎn)擊： 橋式起重機(jī)的變頻器改造應(yīng)用[/align][/b]