電動執(zhí)行器FIRST-2000/25W/220VAC/100N.M1985年，德國魯爾大學(xué)的DePenbrock教授*提出了直接轉(zhuǎn)矩控制變頻技術(shù)。該技術(shù)在很大程度上解決了上述矢量控制的不足，并以新穎的控制思想、簡潔明了的系統(tǒng)結(jié)構(gòu)、優(yōu)良的動靜態(tài)性能得到了迅速發(fā)展。該技術(shù)已成功地應(yīng)用在電力機(jī)車牽引的大功率交流傳動上。 直接轉(zhuǎn)矩控制直接在定子坐標(biāo)系下分析交流電動機(jī)的數(shù)學(xué)模型，控制電動機(jī)的磁鏈和轉(zhuǎn)矩。它不需要將交流電動機(jī)等效為直流電動機(jī)，因而省去了矢量旋轉(zhuǎn)變換中的許多復(fù)雜計算；它不需要模仿直流電動機(jī)的控制，也不需要為解耦而簡化交流電動機(jī)的數(shù)學(xué)模型電機(jī)的極數(shù)。一般電機(jī)極數(shù)以不多于(極為宜，否則變頻器容量就要適當(dāng)加大。

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，實現(xiàn)對異步電動機(jī)的控制。其實質(zhì)是將交流電動機(jī)等效為直流電動機(jī)，分別對速度，磁場兩個分量進(jìn)行獨立控制。通過控制轉(zhuǎn)子磁鏈，然后分解定子電流而獲得轉(zhuǎn)矩和磁場兩個分量，經(jīng)坐標(biāo)變換，實現(xiàn)正交或解耦控制。矢量控制方法的提出具有劃時代的意義
2）轉(zhuǎn)矩特性、臨界轉(zhuǎn)矩、加速轉(zhuǎn)矩。在同等電機(jī)功率情況下，相對于高過載轉(zhuǎn)矩模式，變頻器規(guī)格可以降額選取。3）電磁兼容性。為減少主電源干擾，使用時可在中間電路或變頻器輸入電路中增加電抗器，或安裝前置隔離變壓器。一般當(dāng)電機(jī)與變頻器距離超過50m時，應(yīng)在它們中間串入電抗器、濾波器或采用屏蔽防護(hù)電纜

它是以三相波形整體生成效果為前提，以逼近電機(jī)氣隙的理想圓形旋轉(zhuǎn)磁場軌跡為目的，一次生成三相調(diào)制波形，以內(nèi)切多邊形逼近圓的方式進(jìn)行控制的。經(jīng)實踐使用后又有所改進(jìn)，即引入頻率補(bǔ)償，能消除速度控制的誤差；通過反饋估算磁鏈幅值，消除低速時定子電阻的影響；將輸出電壓、電流閉環(huán)，以提高動態(tài)的精度和穩(wěn)定度。但控制電路環(huán)節(jié)較多，且沒有引入轉(zhuǎn)矩的調(diào)節(jié)，所以系統(tǒng)性能沒有得到*

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From Hong Kong

SIEMENS 6AV6-574-1AA00?-2AA0 NSFP 6AV65741AA002A?A0

SIEMENS 6AV6-581-3AX00?-0AX2 NSFP 6AV65813AX000A?X2

Siemens K-TP178 6AV6 640-0DA11-0AX0 Membrane Keypad NEW
From Hong Kong

MP370-15 Siemens 6AV6 545-0DB10-0AX0 Protective Film NEW
From Hong Kong

Siemens 6AV6 574-2AC00-2AA1 -FS- 6AV65742AC002A?A1

Siemens 6AV6 671-1CB00-0AX2 -FS- 6AV66711CB00-0?AX2

Siemens 6AV6 574-2AC00-2AA1 -NEW- 6AV65742AC002A?A1

NEW Siemens MP277-8 6AV6 643-0CB01-1AX1 643-0CB01-1AX1 Touch glassgood condition
From Hong Kong

Siemens MP270B 6AV6 545-0AH10-0AX0 Touch Glass NEW
From Hong Kong

Original SIEMENS TP177 6AV6 640-0CA11-0AX0 Hmi Lcd Touch Screen Display Glass
From Hong Kong

Siemens MP277-10 6AV6 643-0DD01-1AX1 Touch Glass NEW
From Hong Kong

Siemens HMI Memory Card 128MB 6AV6 671-1CB00-0AX2 (6AV66711CB000?AX2) NIB !
From Poland

Siemens KTP600 6AV6 647-0AD11-3AX0 Touch Glass NEW Free Ship
From Hong Kong

6AV6 640-0DA11-0?AX?0 KTP178 Siemens Membrane Keypad NEW
From Hong Kong

Siemens TP270 6AV6 545-0CA10-0AX0 Touchscreen Glass NEW
From Hong Kong

SIEMENS TP270-10 6AV6 545-0CC10-0?AX?0 Touch Glass NEW
From Hong Kong

MP370-15 Siemens 6AV6 545-0DB10-0AX0 Protective Film NEW Free Ship
From Hong Kong

Siemens OP177B 6AV6 642-0DA01-1AX1 Touchscreen Glass NEW
From Hong Kong

SIEMENS 6AV6-574-2AF00?-8AX0 NSFP 6AV65742AF008A?X0

SIEMENS 6AV6-574-1AD00?-4CX0 NSFP 6AV65741AD004C?X0

Lot of 27 NOS/NIB various RCA tubes 6AV6 5V6 6AL5 6CB6A 12CN5 6AS11 6X8 6FW5

Siemens TP170B 6AV6 545-0BC15-2?AX?0 Touch Glass NEW, free shipping worldwide
From Hong Kong

Siemens 6AV6 671-8XB10-0AX1 -FS- 6AV66718XB100A?X1

SIEMENS 6AV6-610-0AA01?-0AA0 NSFP 6AV66100AA010A?A0

Siemens TP270 6AV6 545-0CA10-0AX0 Touch Glass NEW Free Ship
From Hong Kong

SIEMENS 6AV6-671-2DJ00?-0AX0 NSFP 6AV66712DJ000A?X0

Siemens TP178 6AV6 640-0DA11-0AX0 Touchscreen Glass NEW
From Hong Kong

SIEMENS 6AV6-5741AF044?AA0 USPP 6AV65741AF044A?A0

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 nncbvasus6df73?fhh9ffh6y

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 6AV65741AD004C?XE

SIEMENS 6AV6-574-1AD00?-4EX0-EACH NSPP 6AV65741AD004E?XE

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-?0AX?1 Protective Film NEW Free Ship
From Hong Kong

Vintage GE 6AV6 Stereo Tube Great Britain 3 Available #9sjfg98uygm9e?r 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