IC694MDL754以太網模塊
開關型直流穩壓電源
與線性穩壓電源不同的一類穩電源就是開關型直流穩壓電源,它的電路型式主要有單端反激式,單端正激式、半橋式、推挽式和全橋式。它和線性電源的根本區別在於它變壓器不工作在工頻而是工作在幾十千赫茲到幾兆赫茲。功能管不是工作在飽和就是截止區即開關狀態;開關電源因此而得名。
IC694MDL754以太網模塊
正弦脈寬調制(SPWM)控制方式
其特點是控制電路結構簡單、成本較低,機械特性硬度也較好,能夠滿足一般傳動的平滑調速要求,已在產業的各個領域得到廣泛應用。但是,這種控制方式在低頻時,由於輸出電壓較低,轉矩受定子電阻壓降的影響比較顯著,使輸出大轉矩減小。另外,其機械特性終究沒有直流電動機硬,動態轉矩能力和靜態調速性能都還不盡如人意,且係統性能不高、控制曲線會隨負載的變化而變化,轉矩響應慢、電機轉矩利用率不高,低速時因定子電阻和逆變器死區效應的存在而性能下降,穩定性變差等。因此人們又研究出矢量控制變頻調速。
2711P-T12W21D8S觸摸屏
IC695PNC001電工電氣
IC694MDL754以太網模塊
AGP 1x/2x Grafikkarte Matrox G200 8MB RAM S26316-D1114 Siemens Fujitsu OEM
AGP-Grafikkarte Matrox MGA G100 [220]
AGP-GRAFIKKARTE Matrox Millenium G450 16MB DualHead f徂r 2 Monitore 4xAGP+CD NUR:
Altura Completa Dual Dell 5M801/05M801 Matrox G550 32MB AGP Tarjeta Gr fica
Bureau AGP Graphiccard 3D Matrox G200 01K4422 Pour Windows 2000 7 XP Linux #G39
Bureau AGP Graphiccard 3D Matrox G200 01K4422 Win 2000 7 XP Vista Linux #G39
Classic Bureau Graphique 3D Matrox Mga G200 AGP Pour Windows 7 XP Vista Linux
Classic Office Gr fica 3D Matrox Mga G200 AGP Para Windows 7 XP Vista Linux
CLASSIC OFFICE GRAFIKKARTE 3D MATROX MGA G200 AGP FOR WINDOWS 7 XP VISTA LINUX
Classic Office Graphic Card 3D Matrox Mga G200 AGP For Windows 7 XP Vista Linux
Completo Altezza Doppio Dell 5M801/05M801 Matrox G550 32MB AGP Scheda Grafica
Completo Altezza Doppio Matrox G550 32MB AGP G55MADDA32DB Scheda Grafica
Doppio HP 246746-001 253275-001 Matrox G55MADDA32DB G550 32MB AGP Scheda Grafica
Double HP 246746-001 253275-001 Matrox G55MADDA32DB G550 32MB AGP Graphics Carte
Dual HP 246746-001 253275-001 Matrox G55MADDA32DB G550 32MB AGP Tarjeta Gr fica
FULL HEIGHT DUAL DELL 5M801 / 05M801 MATROX G550 32MB AGP GRAPHICS CARD
G2+/SDA/8BN/20 MATROX AGP VIDEO CARD 8MB
LAUTLOS AGP GRAPHICCARD 3D MATROX G200 G2 01K4422 WINDOWS 2000 7 XP LINUX G39 MM
Lautlose AGP Gr fica Mga Matrox G200 G2 01K4422 Windows 2000 7 XP Linux G39
LAUTLOSE AGP GRAFIKKARTE MGA MATROX G200 G2 01K4422 WINDOWS 2000 7 XP LINUX G39
Lautlose AGP Graphiccard 3D Matrox G200 G2 01K4422 Windows 2000 7 XP Linux G39
LAUTLOSE AGP GRAPHICCARD 3D MATROX G200 G2 01K4422 WINDOWS 2000 7 XP LINUX G39
Lautlose Office Gr fica 3D Matrox G200 AGP Para Windows 2000 7 XP Vista Linux
LAUTLOSE OFFICE GRAFIKKARTE 3D MATROX G200 AGP F徂R WINDOWS 2000 7 XP VISTA LINUX