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HONEYWELL 10024/I/I CTD VVVF變頻、矢量控制變頻、直接轉矩控制變頻都是交-直-交變頻中的一種。其共同缺點是輸入功率因數低，諧波電流大，直流電路需要大的儲能電容，再生能量又不能反饋回電網，即不能進行四象限運行。為此，矩陣式交-交變頻應運而生。由于矩陣式交-交變頻省去了中間直流環(huán)節(jié)，從而省去了體積大、價格貴的電解電容。它能實現(xiàn)功率因數為l，輸入電流為正弦且能四象限運行，系統(tǒng)的功率密度大。該技術目前雖尚未成熟，但仍吸引著眾多的學者深入研究。其實質不是間接的控制電流、磁鏈等量，而是把轉矩直接作為被控制量來實現(xiàn)的。具體方法是：
廈門岳航計算機工程有限公司
聯(lián)系人：李素云
企業(yè)QQ：2851195446，2851195466
手機：18965423501
座機：0592-5165501
——控制定子磁鏈引入定子磁鏈觀測器，實現(xiàn)無速度傳感器方式;
——自動識別(ID)依靠的電機數學模型，對電機參數自動識別;
——算出實際值對應定子阻抗、互感、磁飽和因素、慣量等算出實際的轉矩、定子磁鏈、轉子速度進行實時控制;
——實現(xiàn)Band—Band控制按磁鏈和轉矩的Band-Band控制產生PWM信號，對逆變器開關狀態(tài)進行控制。
矩陣式交—交變頻具有快速的轉矩響應(<2ms)，很高的速度精度(±2%，無PG反饋)，高轉矩精度(<+3%);同時還具有較高的起動轉矩及高轉矩精度，尤其在低速時(包括0速度時)，可輸出150%～200%轉矩。
3 變頻器控制方式的合理選用
控制方式是決定變頻器使用性能的關鍵所在。目前市場上低壓通用變頻器品牌很多，包括歐、美、日及產的共約50多種。選用變頻器時不要認為檔次越高越好，而要按負載的特性，以滿足使用要求為準，以便做到量才使用、經濟實惠。表1中所列參數供選用時參考。 4 轉矩控制型變頻器的選型及相關問題
基于調速方便、節(jié)能、運行可靠的優(yōu)點，變頻調速器已逐漸替代傳統(tǒng)的變極調速、電磁調速和調壓調速方式。在推出PWM磁通矢量控制的變頻器數年后，1998年末又出現(xiàn)采用DTC控制技術的變頻器。ABB公司的ACS600系列是代采用DTC技術的變頻器，它能夠用開環(huán)方式對轉速和轉矩進行準確控制，而且動態(tài)和靜態(tài)指標已優(yōu)于PWM閉環(huán)控制指標。
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SMC NAFM3000-N03D Mist Separator 3/8" NPT
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6DD1642-0BC0
6DD1660-0AE0
6DD1681-0EK1
6ES5491-0LB11
6ES5928-3UA11
6ES7414-2XG03-0AB0
6GT2002-0AA00
C98043-A1682-L1
DS3810MMBB1A1A
IC693CHS391
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PS02-3001V5.00
QLSAMBAN
R15E02A186
07SK90R1
10024/I/I CTD
10105/2/1
3A99158G01
3HAC14550-4/05A
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505-4232A
505-4332
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Hypro 100xKPa 0/160PSI 2.5" 400FD 1/4CBM
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