bently 3500/32 4通道繼電器模塊
bently 3500/32 4通道繼電器模塊
bently 3500/32 4通道繼電器模塊
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阿米控自動(dòng)化備件解決方案
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我們有大量庫(kù)存的高品質(zhì)，停產(chǎn)的控制系統(tǒng)部件。我們還分發(fā)了許多新的硬件和軟件產(chǎn)品，廣泛的測(cè)試和出售的零部件都配備了1年的保修期。
2.發(fā)展趨勢(shì)
變頻器技術(shù)的發(fā)展趨勢(shì)經(jīng)歷大約三十年的研發(fā)與應(yīng)用實(shí)踐，隨著新型電力電子器件和高性能微處理器的應(yīng)用以及控制技術(shù)的發(fā)展，變頻器的性能價(jià)格比越來(lái)越高，體積越來(lái)越小，而廠家仍然在不斷地提高可靠性實(shí)現(xiàn)變頻器的進(jìn)一步小型輕量化、高性能化和多功能化以及無(wú)公害化而做著新的努力。變頻器性能的優(yōu)劣，一要看其輸出交流電壓的諧波對(duì)電機(jī)的影響，二要看對(duì)電網(wǎng)的諧波污染和輸入功率因數(shù)，三要看本身的能量損耗（即效率），這此以交—直—交變頻器為例，從技術(shù)上看在以下幾個(gè)方面會(huì)進(jìn)一步得到發(fā)展：
1．主電路功率開(kāi)關(guān)元件的自關(guān)斷化、模塊化、集成化、智能化，開(kāi)關(guān)頻率不斷提高，開(kāi)關(guān)損耗進(jìn)一步降低。
2．變頻器主電路的拓?fù)浣Y(jié)構(gòu)方面：變頻器的網(wǎng)側(cè)變流器對(duì)低壓小容量的常采用6脈沖變流器，而對(duì)中壓大容量的采用多重化12脈沖以上的變流器。負(fù)載側(cè)變流器對(duì)低壓小容量的常采用兩電平的橋式逆變器，而對(duì)中壓大容量的采用多電平逆變器。
3．脈寬調(diào)制變壓變頻器的控制方法：正弦波脈寬調(diào)制（SPWM）控制。消除指定次數(shù)諧波的PWM控制。電流跟蹤控制。電壓空間矢量控制（磁鏈跟蹤控制）。
4．交流電動(dòng)機(jī)變頻調(diào)整控制方法的進(jìn)展：由標(biāo)量控制（V／f控制和轉(zhuǎn)差頻率控制）向高動(dòng)態(tài)性能的矢量控制和直接轉(zhuǎn)矩控制發(fā)展。開(kāi)發(fā)無(wú)速度傳感器的矢量控制和直接轉(zhuǎn)矩控制系統(tǒng)。
進(jìn)入21世紀(jì)，電力電子的基片已從Si（硅）變換為SiC（碳化硅），使電力電子新器件進(jìn)入到高電壓大容量化、高頻化、組件模塊化、微小型化、智能化和低成本化的時(shí)代，多種適宜變頻調(diào)速的新型電氣設(shè)備正在開(kāi)發(fā)研制之中。IT技術(shù)的迅猛發(fā)展，以及控制理論的不斷創(chuàng)新，這些與變頻器相關(guān)的技術(shù)將影響其發(fā)展的趨勢(shì)。
交流變頻調(diào)速技術(shù)是強(qiáng)弱電混合、機(jī)電一體的綜合性技術(shù)，既要處理巨大電能的轉(zhuǎn)換（整流、逆變），又要處理信息的收集、變換和傳輸，因此它的共性技術(shù)必定分成功率和控制兩大部分。前者要解決與高壓大電流有關(guān)的技術(shù)問(wèn)題和新型電力電子器件的應(yīng)用技術(shù)問(wèn)題，后者要解決（基于現(xiàn)代控制理論的控制策略和智能控制策略）的硬、軟件開(kāi)發(fā)問(wèn)題（在目前狀況下主要全數(shù)字控制技術(shù)）。
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