A16B-1000-0030啟制動(dòng)電流沖擊大，電氣元件損傷嚴(yán)重。普通施工電梯的起動(dòng)都是采取直接起動(dòng)或星三角降壓起動(dòng)，電流沖擊非常大，對(duì)電網(wǎng)、電機(jī)和電氣元件造成嚴(yán)重的破壞。
（2）啟動(dòng)剎車時(shí)機(jī)械振動(dòng)大，機(jī)械損傷嚴(yán)重，且存在安全隱患。普通施工電梯的剎車是採(cǎi)用機(jī)械抱閘強(qiáng)制制動(dòng)，升降機(jī)突然從高速降為零速的時(shí)候，由于慣性的作用，不但對(duì)結(jié)構(gòu)和機(jī)構(gòu)造成損壞，而且升降機(jī)里面的物料容易跌落，特別是有些升降梯還有乘人，也存在著一定的安全隱患。
（3）平層系統(tǒng)落后，工作效率低。普通施工電梯減速到平層時(shí)無(wú)爬行過(guò)程，由運(yùn)行速度直接向零速減速，有的選平層是由司機(jī)靠目測(cè)手動(dòng)控制實(shí)現(xiàn)的，效率低，經(jīng)常要上、下點(diǎn)動(dòng)幾次才能準(zhǔn)確停層。既降低了效率又增大了拖動(dòng)與控制系統(tǒng)的疲勞度，縮短了壽命，同時(shí)也會(huì)造成里面的物料無(wú)法搬運(yùn)，浪費(fèi)了時(shí)間，影響了工作效率。
變頻調(diào)速是近二十年來(lái)興起的一門(mén)新技術(shù)，它是通過(guò)改變電源頻率來(lái)實(shí)現(xiàn)速度的調(diào)節(jié)，因其具有調(diào)速平穩(wěn)、瞬態(tài)穩(wěn)定性高、節(jié)能等特性越來(lái)越被人們所重視，變頻調(diào)速與上位機(jī)系統(tǒng)配合，構(gòu)成高效率、高性能的控制系統(tǒng)已被廣泛使用。傳統(tǒng)施工升降機(jī)存在的諸多問(wèn)題，使得變頻系統(tǒng)在此領(lǐng)域的應(yīng)用成為必然的趨勢(shì)，在變頻控制系統(tǒng)的逐步推廣中，取得了良好的效果，獲得了用戶的好評(píng)。
A16B-1000-0030 變頻器在升降機(jī)上的應(yīng)用
微能公司與廣西某機(jī)械設(shè)備有限公司合作，對(duì)施工升降機(jī)進(jìn)行配套變頻系統(tǒng)，取得了良好的使用效果。由于現(xiàn)場(chǎng)使用的施工升降機(jī)型號(hào)不一，電機(jī)功率也不一樣，本文僅以驅(qū)動(dòng)裝置電機(jī)為3×15KW為例說(shuō)明。
（1）電氣控制原理
升降機(jī)變頻調(diào)速系統(tǒng)由以下部分：盤(pán)式制動(dòng)三相異步電動(dòng)機(jī)，變頻調(diào)速器，變頻器制動(dòng)單元和制動(dòng)電阻，聯(lián)動(dòng)臺(tái)，電氣保護(hù)裝置等構(gòu)成。其控制過(guò)程是：操作聯(lián)動(dòng)臺(tái)上的速度轉(zhuǎn)換開(kāi)關(guān)，選定速度擋，然后輸出信號(hào)給變頻器，改變頻率值，最終達(dá)到調(diào)速的目的。系統(tǒng)的電氣控制主回路原理示意如圖3所示。
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