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clearfix"><div id="xkvwoms" class="twoCol"><div id="z3r9o8j" class="page-proshow clearfix"><p class="current"> 當(dāng)前位置:<a href="http://www.cdcfah.com/">首頁?<a href="http://www.cdcfah.com/cp/">產(chǎn)品供應(yīng)</a>?<a href="http://www.cdcfah.com/cp/first-_jxjxysb/">機(jī)械及行業(yè)設(shè)備</a>?<a href="http://www.cdcfah.com/cp/second-jxjxysb_gkxtjzb/">工控系統(tǒng)及裝備</a>?<a href="http://www.cdcfah.com/cp/third-gkxtjzb_bianpinqi/">變頻器</a>?淄博科恩變頻器生產(chǎn)廠家淄博科恩電氣自動化技術(shù)供應(yīng)</p><div id="8ml8h9r" class="leftbox clearfix"><h1>淄博科恩變頻器生產(chǎn)廠家淄博科恩電氣自動化技術(shù)供應(yīng)</h1><div id="8cdhctf" class="proBig"><div id="8vw3fny" class="bigimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/2019/4/12/15/636906796470209396_keendianqi_7686135.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="ibca7dk" class="smallimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/2019/4/12/15/636906796470209396_keendianqi_7686135.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="h33eofl" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>山東省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>淄博科恩變頻器生產(chǎn)廠家</p><p><span>***更新：</span>2020-06-10 09:02:03</p><p><span id="click" >瀏覽次數(shù)：7次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="88pn3tz" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">淄博科恩電氣自動化技術(shù)有限公司</a></p><p><span>聯(lián)系人：</span>李寧</p><p><span>郵箱: </span>shandongken198@163.com</p><p><span>電話: </span>13371560696</p><p><span>傳真: </span>0533_2855952</p><p><span>網(wǎng)址: </span></p><p><span>手機(jī): </span>0533-2855952</p><p><span>地址: </span>昌國西路111號魯中五金機(jī)電城東區(qū)F-15號</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="yvrhsdj" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="3438nl8" class="box"><p><p> 變頻器電源變頻器能使輸出電壓和頻率的關(guān)系保持不變。在達(dá)到額定轉(zhuǎn)速前,電機(jī)中的磁通量基本保持恒定,因而能以恒定轉(zhuǎn)矩運(yùn)行。當(dāng)超過額定轉(zhuǎn)速后,電壓保持不變,電機(jī)中的磁通量隨著輸出頻率的增加而降低,因而功率保持穩(wěn)定。此變頻器采用交-直-交變頻方式[6]，淄博科恩變頻器生產(chǎn)廠家。變頻器電源部分電路結(jié)構(gòu)圖如圖1。圖1中,a為電抗器,其作用是隔離電網(wǎng)中的高次諧波,提高供電電能質(zhì)量,以減輕對IGBT和電解電容的干擾。b為預(yù)充電單元,在變頻器啟動的過程中,為了避免啟動電流過大燒毀熔斷器而造成變頻器損壞，淄博科恩變頻器生產(chǎn)廠家,先將預(yù)充電單元中的限流電阻接入整流電路電源側(cè),以減小電路中的充電電流。隨后,整流電路d工作,該整流電路為三相橋式全控整流電路,與不控整流電路相比,全控整流可以完全避免同一橋臂導(dǎo)通而造成短路的危險性,從而提高整流電路的安全性與穩(wěn)定性。中間電容e位于直流側(cè),在預(yù)充電單元接通后對中間電容進(jìn)行充電。當(dāng)電容兩側(cè)電壓增大到300V時,充電電流就會大幅降低,預(yù)充電單元輔助接觸器斷開,預(yù)充電過程結(jié)束,主接觸器同時c閉合,繼續(xù)不間斷向中間電容電路e充電,此電路不僅能在整流電路和三相橋式逆變電路f中起隔離作用，淄博科恩變頻器生產(chǎn)廠家,而且可以為電路f提供1個穩(wěn)定的直流電壓。當(dāng)充電電容兩側(cè)電壓大于690VDC時。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="淄博科恩變頻器生產(chǎn)廠家" src="http://tyunfile.71360.com/UpLoadFile/2019/4/12/15/636906796470209396_keendianqi_7686135.jpg"></div><p> VVVF變頻器的控制相對簡單，機(jī)械特性硬度也較好，能夠滿足一般傳動的平滑調(diào)速要求，已在產(chǎn)業(yè)的各個領(lǐng)域得到廣泛應(yīng)用。但是，這種控制方式在低頻時，由于輸出電壓較小，受定子電阻壓降的影響比較，故造成輸出比較大轉(zhuǎn)矩減小。另外，其機(jī)械特性終究沒有直流電動機(jī)硬，動態(tài)轉(zhuǎn)矩能力和靜態(tài)調(diào)速性能都還不盡如人意，因此人們又研究出矢量控制變頻調(diào)速[1]。矢量控制變頻調(diào)速的做法是：將異步電動機(jī)在三相坐標(biāo)系下的定子交流電流Ia、Ib、Ic、通過三相—二相變換，等效成兩相靜止坐標(biāo)系下的交流電流Ia1Ib1，再通過按轉(zhuǎn)子磁場定向旋轉(zhuǎn)變換，等效成同步旋轉(zhuǎn)坐標(biāo)系下的直流電流Im1、It1(Im1相當(dāng)于直流電動機(jī)的勵磁電流；It1相當(dāng)于與轉(zhuǎn)矩成正比的電樞電流)，然后模仿直流電動機(jī)的控制方法，求得直流電動機(jī)的控制量，經(jīng)過相應(yīng)的坐標(biāo)反變換，實(shí)現(xiàn)對異步電動機(jī)的控制。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="淄博科恩變頻器生產(chǎn)廠家" src="http://tyunfile.71360.com/UpLoadFile/2019/4/13/14/636907614650837964_keendianqi_5535516.jpg"></div><p style="text-indent:25px">過電流故障在變頻器各種故障當(dāng)中為常見。該故障多是由于以下問題造成的：首先，啟動時只要升速變頻器就報(bào)故障，說明過電流很嚴(yán)重，多是負(fù)載短路、機(jī)械部件卡死、逆變模塊軟擊穿損壞以及加速時間過短造成的;其次變頻器一送電就報(bào)故障，而且不能“復(fù)位”排除，則大多是因?yàn)樽冾l器內(nèi)部驅(qū)動電路損壞、電流檢測回路損壞等造成的;一種極端的現(xiàn)象，變頻器在通電瞬間或經(jīng)過短暫的延時，便直接造成上級空開跳閘同時機(jī)身內(nèi)部發(fā)出炸響或冒出火花，則變頻器整流單元、功率逆變元件等直接出現(xiàn)擊穿故障所造成的。在排除供電電壓過高外，還有一種情況下也會出現(xiàn)這種故障——當(dāng)變頻器停機(jī)過程中。這種情況主要原因可能是減速時間太短或制動電阻及制動單元出現(xiàn)問題所導(dǎo)致的。一般在排除電源電壓過低外，還可能有以下幾種原因造成的：電源缺相、整流電路一個橋臂發(fā)生開路故障、主回路當(dāng)中的濾波電解電容容量變小、或者電壓檢測電路出現(xiàn)問題也會致使變頻器發(fā)生欠電壓故障。另外如果變頻器內(nèi)部的緩充電阻未被短路切除，只要變頻器帶載啟動也會發(fā)生報(bào)欠電壓故障。超溫同樣也是變頻器一種常見的故障，該故障多是因?yàn)樽冾l器工作環(huán)境溫度過高、散熱孔被堵等原因。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="淄博科恩變頻器生產(chǎn)廠家" src="http://tyunfile.71360.com/UpLoadFile/2019/4/12/15/636906789584798795_keendianqi_8881368.jpg"></div></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/212003.html</p></div></div></div></div></div><div id="pioof8h" 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