电动执行器FIRST-2000/25W/220VAC/100N.M
时间：2020-10-23 阅读：627
电动执行器FIRST-2000/25W/220VAC/100N.M1985年，德国鲁尔大学的DePenbrock教授*提出了直接转矩控制变频技术。该技术在很大程度上解决了上述矢量控制的不足，并以新颖的控制思想、简洁明了的系统结构、优良的动静态性能得到了迅速发展。该技术已成功地应用在电力机车牵引的大功率交流传动上。 直接转矩控制直接在定子坐标系下分析交流电动机的数学模型，控制电动机的磁链和转矩。它不需要将交流电动机等效为直流电动机，因而省去了矢量旋转变换中的许多复杂计算；它不需要模仿直流电动机的控制，也不需要为解耦而简化交流电动机的数学模型电机的极数。一般电机极数以不多于(极为宜，否则变频器容量就要适当加大。
矢量控制变频调速的做法是将异步电动机在三相坐标系下的定子电流Ia、Ib、Ic、通过三相－二相变换，等效成两相静止坐标系下的交流电流Ia1Ib1，再通过按转子磁场定向旋转变换，等效成同步旋转坐标系下的直流电流Im1、It1(Im1相当于直流电动机的励磁电流；It1相当于与转矩成正比的电枢电流)，然后模仿直流电动机的控制方法，求得直流电动机的控制量，经过相应的坐标反变换，实现对异步电动机的控制。其实质是将交流电动机等效为直流电动机，分别对速度，磁场两个分量进行独立控制。通过控制转子磁链，然后分解定子电流而获得转矩和磁场两个分量，经坐标变换，实现正交或解耦控制。矢量控制方法的提出具有划时代的意义
2）转矩特性、临界转矩、加速转矩。在同等电机功率情况下，相对于高过载转矩模式，变频器规格可以降额选取。3）电磁兼容性。为减少主电源干扰，使用时可在中间电路或变频器输入电路中增加电抗器，或安装前置隔离变压器。一般当电机与变频器距离超过50m时，应在它们中间串入电抗器、滤波器或采用屏蔽防护电缆
它是以三相波形整体生成效果为前提，以逼近电机气隙的理想圆形旋转磁场轨迹为目的，一次生成三相调制波形，以内切多边形逼近圆的方式进行控制的。经实践使用后又有所改进，即引入频率补偿，能消除速度控制的误差；通过反馈估算磁链幅值，消除低速时定子电阻的影响；将输出电压、电流闭环，以提高动态的精度和稳定度。但控制电路环节较多，且没有引入转矩的调节，所以系统性能没有得到*
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SIEMENS 6AV6-574-1AD00-4CX0 NSFP 6AV65741AD004CX0
Lot of 27 NOS/NIB various RCA tubes 6AV6 5V6 6AL5 6CB6A 12CN5 6AS11 6X8 6FW5
Siemens TP170B 6AV6 545-0BC15-2AX0 Touch Glass NEW, free shipping worldwide
From Hong Kong
Siemens 6AV6 671-8XB10-0AX1 -FS- 6AV66718XB100AX1
SIEMENS 6AV6-610-0AA01-0AA0 NSFP 6AV66100AA010AA0
Siemens TP270 6AV6 545-0CA10-0AX0 Touch Glass NEW Free Ship
From Hong Kong
SIEMENS 6AV6-671-2DJ00-0AX0 NSFP 6AV66712DJ000AX0
Siemens TP178 6AV6 640-0DA11-0AX0 Touchscreen Glass NEW
From Hong Kong
SIEMENS 6AV6-5741AF044AA0 USPP 6AV65741AF044AA0
NEW Touch Glass Screen Digitizer FOR Siemens TP177A 6AV6 642-0AA11-0AX1
From China
6AB4, 6AF3, 6AF4A, 6AG5, 6AK6, 6AU8A, 6AV6, 6AZ8 & more Vacuum Tubes Lot of 13
Siemens TP177 6AV6 640-0CA11-0AX0 Touchscreen Glass NEW
From Hong Kong
2 Vintage Mullard Shield 6AV6 EBC91 #3 Stereo Tubes # -2 nncbvasus6df73fhh9ffh6y
2x 6AV6/EBC91 PHILIPS NOS Tube Röhre Lampe TSF Valvola Valvula
From Italy
Lot of 5 Vintage GE 6AV6 Double Diode-Triode Tubes, Satisfaction Guaranteed LtD8
Siemens K-TP178 6AV6 640-0DA11-0AX0 Protective Film NEW
From Hong Kong
Siemens TP177A 6AV6 642-0AA11-0AX1 Touchs Glass NEW
From Hong Kong
2 Vintage Mullard Shield 6AV6 EBC91 #4 Stereo Tube #36p mmmmmnnnn 0098nniociu
[32] - NOS RCA WESTINGHOUSE ROGERS VINTAGE ELECTRONIC TUBES 6BC5 6AV6 MORE..
From Canada
GE 6AV6 Electronic Vacuum Tube Lot of 2
1x EBC91/6AV6 TELEFUNKEN NOS DIAMOND Tube Röhre Lampe TSF Valvola Valvula
From Italy
(23) MIXED LOT 6AV6 ELECTRON TUBES - 9 NOS - RCA, GE, SYLVANIA, RAYTHEON, ETC.
SIEMENS 6AV6-574-1AD00-4CX0-EACH NSPP 6AV65741AD004CXE
SIEMENS 6AV6-574-1AD00-4EX0-EACH NSPP 6AV65741AD004EXE
JV103 Westinghouse Vacuum Tube 5U4GB 5642 12AF6 6AV6 L
From Canada
TELEFUNKEN 6AV6 6AT6 for McIntosh MR67 FENDER HARVARD
6BA6 6BE6 6AQ5 6AV6 5Y3GT AA5 AUDIO TUBE SET VINTAGE CONSUMER ELECTRONICS
SLEEVE OF 5 GE JAN 6AV6/6AT6 TUBES
JV103 Westinghouse Vacuum Tube 5U4GB 5642 12AF6 6AV6 L
From Canada
Siemens TP177B 6AV6 642-0BC01-1AX1 Touchscreen protective film
From Hong Kong
Siemens TP177A 6AV6 642-0AA11-0AX1 Protective Film NEW Free Ship
From Hong Kong
Vintage GE 6AV6 Stereo Tube Great Britain 3 Available #9sjfg98uygm9er 79tgy7yh79
1x 6AV6/EBC91 MARCONI NOS Tube Röhre Lampe TSF Valvola Valvula
From Italy
1x EBC91/6AV6 VALVO NOS Tube Röhre Lampe TSF Valvola Valvula
From Italy
1x 6AV6/EBC91 WESTINGHOUSE NOS Tube Röhre Lampe TSF Valvola Valvula
From Italy
VINTAGE TUBES TUBE 6AV6 SYLVANIA NOS NEW OLD STOCK VALVULA LAMPE RCA LOT OF 5
Vintage New Old Stock NOS Radio/TV Vacuum Tube- RCA 6AV6
Vintage New Old Stock NOS Radio/TV Vacuum Tube- CBS 6AV6
Vintage New Old Stock NOS Radio/TV Vacuum Tube- Raytheon 6AV6
Vintage New Old Stock NOS Radio/TV Vacuum Tube- Sylvania 6AV6
Vintage New Old Stock NOS Radio/TV Vacuum Tube- Sylvania 6AV6
Vintage New Old Stock NOS Radio/TV Vacuum Tube- Telefunken 6AV6
Vintage New Old Stock NOS Radio/TV Vacuum Tube- Westinghouse 6AV6
Vintage New Old Stock NOS Radio/TV Vacuum Tube- General Electric GE 6AV6
Vintage New Old Stock NOS Radio/TV Vacuum Tube- Quality Radio 6AV6
Vintage New Old Stock NOS Radio/TV Vacuum Tube- RCA 6AV6
Vintage NOS New in Box RCA 6AV6 Radio Tube
Vintage Mullard 6AV6 Stereo Tube
Radio VacuumTubes 6AV6 JAN / GE (5) NOS/NIB
Vacuum Tubes - 6AV6 JAN / RCA (5 NOS/NIB TUBES)
Radio Vacuum Tubes 6AV6 SYLVANIA 5 PC NOS/NIB
Radio Vacuum Tubes 6AV6 JAN / GE (5) NIB/NOS
Radio Vacuum Tubes 6AV6 JAN / RCA (5) NIB/NOS
Radio VacuumTubes 6AV6 RCA (5) NOS/NIB
Vacuum Tubes - 6AV6 GE (5 NOS/NIB)
6AV6/EBC91 SYLVANIA NOS Tube Röhre Lampe TSF Valvola Valvula
From Italy
1x 6AV6/EBC91 GE NOS Tube Röhre Lampe TSF Valvola Valvula
From Italy
3 VINTAGE TUBES (2) # 6AV6 (1) 6AU6WB VACUUM TUBES TESTED GOOD
