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onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="dlsza8u" 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>淄博科恩軟啟動器代理,科恩軟啟動器</p><p><span>***更新：</span>2020-09-25 06:02:03</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="3szlhtk" 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: </span>0533-2855952</p><p><span>地址: </span>昌國西路111號魯中五金機電城東區(qū)F-15號</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="8ryfb82" class="page-proshow02"><p class="title">詳細說明</p><div id="oxeq78h" class="box"><p><p> 交流感應(yīng)電動機在直接啟動時存在著兩點缺點，首先它的啟動電流可高達額定電流的5－7倍，這要求電網(wǎng)寬裕量比較大，而且降低電器控制設(shè)備的使用壽命，增加維護成本；其次，啟動轉(zhuǎn)矩可達正常轉(zhuǎn)矩的兩倍，這會對負載產(chǎn)生沖擊，增加傳動部件的磨損和額外維護?；谝陨显?，產(chǎn)生交流感應(yīng)電動機降壓啟動設(shè)備。傳統(tǒng)的降壓啟動方法有Y/△啟動和自耦變壓器降壓啟動兩種，每種都有各自的缺點。電動機用Y/△啟動設(shè)備啟動時，在切換瞬間會出現(xiàn)很高的電流尖峰，產(chǎn)生破壞性的動態(tài)轉(zhuǎn)矩，淄博科恩軟啟動器代理，其引起的機械振動對電動機轉(zhuǎn)子、軸連接器，淄博科恩軟啟動器代理，淄博科恩軟啟動器代理、中間齒輪以及負載等都非常有害；自耦變壓器降壓啟動設(shè)備體積龐大、成本高，而且還存在與負載匹配的電動機轉(zhuǎn)矩很難控制等缺點。由于傳統(tǒng)的降壓啟動設(shè)備存在諸多缺點，這才出現(xiàn)了電子式數(shù)字軟啟動裝置。淄博科恩軟啟動器代理</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="淄博科恩軟啟動器代理,科恩軟啟動器" src="http://tyunfile.71360.com/UpLoadFile/2019/4/13/14/636907616797780381_keendianqi_8202757.jpg"></div><p> 它的主要構(gòu)成是串接于電源與被控電機之間的三相反并聯(lián)閘管及其電子控制電路。運用不同的方法，控制三相反并聯(lián)閘管的導通角，使被控電機的輸入電壓按不同的要求而變化，就可實現(xiàn)不同的功能。變頻器（Variable-frequencyDrive，VFD）是應(yīng)用變頻技術(shù)與微電子技術(shù)，通過改變電機工作電源頻率方式來控制交流電動機的電力控制設(shè)備。變頻器主要由整流（交流變直流）、濾波、逆變（直流變交流）、制動單元、驅(qū)動單元、檢測單元微處理單元等組成。變頻器靠內(nèi)部IGBT的開斷來調(diào)整輸出電源的電壓和頻率，根據(jù)電機的實際需要來提供其所需要的電源電壓，進而達到節(jié)能、調(diào)速的目的，另外，變頻器還有很多的保護功能，如過流、過壓、過載保護等等。隨著工業(yè)自動化程度的不斷提高，變頻器也得到了非常的應(yīng)用。軟啟動器和變頻器是兩種完全不同用途的產(chǎn)品。變頻器是用于需要調(diào)速的地方，其輸出不但改變電壓而且同時改變頻率；軟啟動器實際上是個調(diào)壓器，用于電機起動時，輸出只改變電壓并沒有改變頻率。變頻器具備所有軟起動器功能，但它的價格比軟啟動器貴得多，結(jié)構(gòu)也復雜得多。軟啟動器只是改變電源電壓，相當于降壓起動器。變頻器要比軟啟動器復雜得多，價格也貴得多。變頻器也有軟啟動功能。淄博科恩軟啟動器代理</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="淄博科恩軟啟動器代理,科恩軟啟動器" src="http://tyunfile.71360.com/UpLoadFile/2019/4/12/14/636906757443826248_keendianqi_9094734.jpg"></div><p style="text-indent:25px">電機軟啟動器是一種集電機軟啟動、軟停車、輕載節(jié)能等多功能于一體的新穎電機裝置，可普遍應(yīng)用到風機、水泵、輸送類及壓縮機等負載。 1.電機軟啟動器本身是沒有短路保護的，為了保護其中的晶閘管應(yīng)該采用快速熔斷器，因此我們在要根據(jù)軟啟動器的額定電流來選擇快速熔斷器，因為低壓斷路器開斷時間較長(約為0.1S)，所以不宜用于晶閘管的保護。 2.當我們在使用電機軟啟動器時，使電動機制動停機，主要的原因是由于晶閘管不導通，所以我們在檢修電動機或線路時，必須要先斷開供電電源，這樣可以使軟啟動器與電源之間增設(shè)斷路器 3.電機軟啟動器在內(nèi)部設(shè)置了多種保護功能，在具體使用時要根據(jù)實際的需要，通過編程來選擇保護功能或者使某些保護功能失效，例如：突然斷電時過負載造成的損失會更大，其過負載保護應(yīng)作用與信號而不應(yīng)用于切斷電路。 4.當電機軟啟動器功率較大或者臺數(shù)較多時，產(chǎn)生的高次諧波會對電網(wǎng)所造成不良影響，并且對電子設(shè)備產(chǎn)生干擾，當電動機平穩(wěn)啟動到正常轉(zhuǎn)速時，旁路接觸器閉合，把軟啟動器短接，在啟動完成之后，大功率晶閘管不在工作，從而消去除高次諧波對電網(wǎng)以及電子設(shè)備的干擾。</p><p> 晶閘管導通條件為：加正向電壓且門極有觸發(fā)電流;其派生器件有：快速晶閘管，雙向晶閘管，逆導晶閘管，光控晶閘管等。它是一種大功率開關(guān)型半導體器件，在電路中用文字符號為“V”、“VT表示。晶閘管在工作過程中，它的陽極(A)和陰極(K)與電源和負載連接，組成晶閘管的主電路，晶閘管的門極G和陰極K與控制晶閘管的裝置連接，組成晶閘管的控制電路。高壓晶閘管軟啟動器為半控型電力電子器件，它的工作條件如下：1.晶閘管承受反向陽極電壓時，不管門極承受何種電壓，晶閘管都處于反向阻斷狀態(tài)。2.晶閘管承受正向陽極電壓時，*在門極承受正向電壓的情況下晶閘管才導通。這時晶閘管處于正向?qū)顟B(tài)，這就是晶閘管的閘流特性，即可控特性。3.晶閘管在導通情況下，只要有一定的正向陽極電壓，不論門極電壓如何，晶閘管保持導通，即晶閘管導通后，門極失去作用。門極只起觸發(fā)作用。4.晶閘管在導通情況下，當主回路電壓(或電流)減小到接近于零時，晶閘管關(guān)斷。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="淄博科恩軟啟動器代理,科恩軟啟動器" src="https://tyunfile.71360.com/UploadFile/keendianqi/637235132859755860/5468229.jpg"></div><p> 軟起動器主回路采用晶閘管,通過逐步改變晶閘管的導通角來抬升電壓,完成起動過程,這是軟起動器的基本原理。目前在低壓軟起動器市場,產(chǎn)品繁多,但是高壓軟起動器產(chǎn)品還是比較少。高壓軟起動器與低壓軟起動器基本原理一樣，但是高壓軟起動器與低壓軟起動器相比,有些地方存在著其特殊性：1.高壓軟起動器在高壓環(huán)境下工作,各種電氣元器件的絕緣性能一定要好,電子芯片的抗干擾能力要強。高壓軟起動器組成電氣柜時,電氣元器件的布局以及與高壓軟起動器與其它電氣設(shè)備的連接也是非常重要的。2.高壓軟起動器必須有一個高性能的控制,能對信號進行及時和快速地處理。因此這個控制一般采用高性能的DSP芯片,而不是低壓軟起動器的普通單片機芯。低壓軟起動器主回路由三組反并聯(lián)的晶閘管組成。而在高壓軟起動器中,由于目前單只高壓晶閘管的耐壓能力不夠,所以必須由多個高壓晶閘管串聯(lián)進行分壓。但是每個晶閘管的性能參數(shù)沒有完全一致。晶閘管參數(shù)的不一致，會導致晶閘管開通時間不一致，從而導致晶閘管的損壞。因此在晶閘管的選配上,必須保證每一相的晶閘管參數(shù)盡可能地一致，并且每一相晶閘管的RC濾波電路的元件參數(shù)盡可能一致。3．高壓軟起動器的工作環(huán)境容易受到各種電磁干擾。淄博科恩軟啟動器代理</p><p style="text-indent:25px">淄博科恩軟啟動器代理</p><p style="text-indent:25px">軟啟動是指電機的電壓由零慢慢上升到額定電壓，這樣電機在啟動的過程中啟動電流，由過去的過載沖擊不可控電流變成了可控制的電流，并且可以根據(jù)需要來對電機啟動器進行電流的大小調(diào)整。如果直接啟動電機軟啟動器對軟啟動器有什么樣的危害呢？ 1.會引起電網(wǎng)電壓的波動交流電動機在全壓下直接啟動，起動電流會達到額定電流的4到7倍，如果電機的容量相對來說比較大時，啟動電流會引起電網(wǎng)電壓的急劇下降，同時還會影響電網(wǎng)和其他設(shè)備的正常運行。 2.對電網(wǎng)的影響對于電網(wǎng)的影響會表現(xiàn)在兩個方面（1）超大型的電機直接啟動，大電流對電網(wǎng)的沖擊相當于三相短路對電網(wǎng)的沖擊，這時會常常應(yīng)發(fā)發(fā)動機的振蕩，使電網(wǎng)失去穩(wěn)定。（2）起動電流中含有大量的高次諧波，會與電網(wǎng)電路參數(shù)引起高頻諧振，造成繼電保護誤動作、自動控制失靈等故障。 3.傷害電機絕緣（1）大電流所產(chǎn)生的焦耳熱反復作用于導線外絕緣，使絕緣加速老化、壽命降低。（2）大電流產(chǎn)生的機械力使導線相互摩擦，降低絕緣壽命。（3）高壓開關(guān)合閘時觸頭的抖動現(xiàn)象會在電機定子繞組上產(chǎn)生操作過電壓，有時會達到外加電壓的5倍以上，這樣高的過電壓會對電機絕緣造成極大。淄博科恩軟啟動器代理</p><p style="text-indent:25px">淄博科恩電氣自動化技術(shù)有限公司主要經(jīng)營范圍是電工電氣，擁有一支專業(yè)技術(shù)團隊和良好的市場口碑。公司業(yè)務(wù)分為科恩變頻器，防爆柜，山東變頻器代理，電機智能軟啟動器等，目前不斷進行創(chuàng)新和服務(wù)改進，為客戶提供良好的產(chǎn)品和服務(wù)。公司將不斷增強企業(yè)重點競爭力，努力學習行業(yè)知識，遵守行業(yè)規(guī)范，植根于電工電氣行業(yè)的發(fā)展?？贫鞴?yīng)立足于全國市場，依托強大的研發(fā)實力，融合前沿的技術(shù)理念，飛快響應(yīng)客戶的變化需求。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1413591.html</p></div></div></div></div></div><div id="m33x9le" class="page-right twoColRt"><div id="33xqhoa" class="box01 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