electronic power units

... để tìm ra con số cần thiết ví dụ như: - http://www.jscustompcs.com /power_ supply/ - http://www.mymp3car.com/MP3Car/PSUpower.asp Trong thực thế, Khi đem một hệ thống thuộc dạng mạnh được ... liên tục: Mức năng lượng liên tục (Continuous Power) là chỉ số nêu lên khả năng cấp điện của nguồn mọi lúc trong khi năng lượng cực đại (Peak Power) lại chỉ mức tối đa trong khoảng thời gia...

Ngày tải lên: 01/11/2012, 16:38

... normal speed range, even at standstill (zero speed) . ã The output power is zero at zero speed. In the normal speed range and at constant torque, the output power increases in proportion to the speed. ... controlled. Variable speed drives that control the speed of DC motors are loosely called DC variable speed drives or simply DC drives and those that control the...

Ngày tải lên: 08/09/2013, 21:03

... Trans. Power Electron., PE-1, 21–31, January 1986. 3. D. W. Hart, Introduction to Power Electronics, Prentice-Hall, Englewood Cliffs, NJ, 1997, 194. 4. P. T. Krein, Elements of Power Electronics, ... arrangement [1]. However, most power electronics converters are circuits with controllable voltage output. To achieve current control, the voltage of the power electronics converter can...

Ngày tải lên: 17/10/2013, 11:15

... regenerate power, and high power capability. DC drives and motors from a few horsepower to hundreds of horsepower could be operated and controlled efficiently in all four quadrants when powered by ... Systems up to several horsepower were successfully applied to DC motors using permanent magnet fields. The power dissipated by the transistor when gated-on is minimal and the power while ga...

Ngày tải lên: 19/10/2013, 18:15

... European Space Power Conf. (ESPC), Graz, August 1993, 173–178. 12. J. Fernando Silva and Sonia S. Paulo, Fixed frequency sliding mode modulator for current mode PWM inverters, in Power Electronics ... used in other applications, not discussed here, such as inverters [14, 18], power factor controllers [16], and AC power supplies [17]. References 1. V. I. Utkin, Sliding Modes and Their...

Ngày tải lên: 19/10/2013, 18:15

... Williams, A comparison of vector control and direct torque control of an induction machine, in Power Electronics Spec. Conf., 1, 421–426, 2000. © 2002 by CRC Press LLC the time-varying inductances ... T. A. Lipo, A new method for rotor time constant tuning in indirect field oriented control, in Power Electronics Spec. Conf., 573–580, 1990. 14. D. M. Brod and D. W. Novotny, Current control...

Ngày tải lên: 23/10/2013, 16:15

... Acarnley, A.G. Jack, and P.T. Jowett, Power circuits for small permanent-magnet brushless dc drives, presented at Third International Conference on Power Electronics and Variable Speed Drives, 1988, ... Machines (Brushless DC Machines/Electronics) 10.1 Introduction 10.2 Machine Construction Permanent Magnets • Stator Windings 10.3 Motor Characteristics Mathematical Model 10.4...

Ngày tải lên: 23/10/2013, 16:15

... and M. Elbuluk, Energy-efficient C-dump converters for switched reluctance motors, IEEE Trans. Power Electronics, 12(5), 912–921, 1997. 9. M. Ehsani, J. T. Bass, T. J. E. Miller, and R. L. Steigerwald, ... constant power region. The conduction angle is increased by advancing the turn-on angle until the θ dwell reaches its upper limit at speed ω p . The medium speed range through which c...

Ngày tải lên: 27/10/2013, 23:15

... 0= v s v q 2 v d 2 += â 2002 by CRC Press LLC The power into the machine is simply the sum of the power into each phase: (12.8) and the power output of the machine is (12.9) where ω rm ... converts its input commands into commands for the power converter/modulator block and sometimes utilizes feedback of voltage or current. The power converter block imposes the desired el...

Ngày tải lên: 27/10/2013, 23:15

... http://www.simpopdf.com Contents 5 Power units on single/3-phase supplies 33 5.1 Thyristor power units on single/3-phase networks 34 5.1.1 Single-phase operation: phase-N or phase-phase 34 5.1.2 Power units in a 3-phase ... thyristor power units to put together what is known as an economy circuit, thus saving the 3rd thyristor power unit. The load (in star or delta form) is...

Ngày tải lên: 27/06/2014, 14:20

... suppression 41 7 Abbreviations 43 Electronic Power Units Manfred Schleicher Winfried Schneider Contents 1 Thyristor power units 7 1. 1 The thyristor as an electronic switch 7 1. 1 .1 Structure ... t i Th1 = load current through thyristor 1 7 JUMO, FAS 620, Edition 02.03 1 Thyristor power units 1. 1 The thyristor as an electronic switch 1. 1 .1 Structure and...

Ngày tải lên: 07/08/2014, 23:20

... cycle ON time T e Clock period T = (1) T e T 2 IGBT power units 20 JUMO, FAS 620 , Edition 02. 03 1 Thyristor power units 14 JUMO, FAS 620 , Edition 02. 03 1.3.3 Burst-firing operation with phase-angle ... Minimum control reactive power - Compact dimensions - Free selection of the underlying control loop: V 2 , P, I 2 1 Thyristor power units 12 JUMO, FAS 620 , Edit...

Ngày tải lên: 07/08/2014, 23:20

... it is necessary to provide power units (whether thyristor or IGBT power units) that can produce twice the (nominal) power for the heater elements. With thyristor power units, care must be taken ... (Fig. 18). 27 3 Closed control loops and underlying controls JUMO, FAS 620, Edition 02. 03 3 .3 P control Power control (P control) is a continuous regulation of the product V ·...

Ngày tải lên: 07/08/2014, 23:20

... circuit No. of power units1 1332 Rated load voltage for thyristor power unit V L V N V N V L V L 3~/N /40 0/ 230V 40 0V 230V 230V 40 0V 40 0V Formula for current in thyristor power unit 3~/N /40 0/ 230V I S (A) ... L3 I S I S P nom/Load W[] 3V L V[]ã = V S V L = (16) 39 5 Power units on single/3-phase supplies JUMO, FAS 620, Edition 02.03 5.2 IGBT power units on single/3-...

Ngày tải lên: 07/08/2014, 23:20

... input 32 4.6 Actual power level output 32 4.7 External mode changeover for thyristor power units 32 Contents 5 Power units on single/3-phase supplies 33 5.1 Thyristor power units on single/3-phase ... phase-phase 34 5.1.2 Power units in a 3-phase system 35 5.2 IGBT power units on single/3-phase networks 39 5.2.1 Single-phase operation: phase-N or phase-phase 39 5.2.2 IGB...

Ngày tải lên: 17/10/2014, 11:35