newnes electrical power engineers handbook

... between electrical power engineering and electronics. Since the main target of this book is electrical power equipment, a change of title was agreed and so we now have the Newnes Electrical Power ... attempted in the tables listing the key standards. Newnes Electrical Power Engineer’s Handbook 3 This page intentionally left blank Chapter 2 Principles of electrical engi...

Ngày tải lên: 21/03/2014, 12:10

Ngày tải lên: 02/01/2014, 09:29

... compact size, and low cost, switching power supplies continue to gain popularity. Switching power supplies could be as high as three times more efficient than linear power supplies and in some cases ... E. Tarter, Solid-State Power Conversion Handbook, Wiley, New York, 1993, 484–491. 2. S. S. Kelkar and F. C. Y. Lee, A fast time domain digital simulation technique for power converte...

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

... process and switch modulation. Thus, the sliding-mode control represents a powerful tool to enhance performance of power converters. Sliding-mode control is able to ensure system stability even ... 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 Appli...

Ngày tải lên: 19/10/2013, 18:15

... related to the FIGURE 11.16 Electrical torque of the DTC drive. 0.03 0.0301 0.0301 0.0302 0.0302 0.0303 0.0303 0.0304 0.0304 0.0305 0.0305 3 3.5 4 4.5 5 5.5 6 6.5 Electrical torque (N.m) T e +∆ ... Control of Electrical Drives, Springer-Verlag, New York, 1996. 13. J. C. Moreira and T. A. Lipo, A new method for rotor time constant tuning in indirect field oriented control, in Power Elec...

Ngày tải lên: 23/10/2013, 16:15

... rotor, electrical losses in the rotor are minimal. The BLDC motor compares favorably with induction motors in the fractional horsepower range. The former will have better efficiency and better power ... the number of power devices, but ensures complete electrical isolation between phases so that remedial strategies can be adopted to continue operation even with the failure of a power...

Ngày tải lên: 23/10/2013, 16:15

... SR motor, together with the fact that the stator phases are electrically isolated from one another, has generated a wide variety of power circuit configurations. The type of converter required ... motor must have an even number of phases. Also, the power devices must be rated to withstand the full DC supply voltage. The high cost of power semiconductor devices and the need to reduce the...

Ngày tải lên: 27/10/2013, 23:15

... estimators). The controller outputs commands for the electrical variables to obey. The electrical control block converts its input commands into commands for the power converter/modulator block and sometimes ... l pm +   T cog += T cog T q z zN t q r ()T d z zN t q r ()sin+cos z∈Z ∑ = T q z T d z T q z T d z © 2002 by CRC Press LLC The power into the machine is simply the sum...

Ngày tải lên: 27/10/2013, 23:15

... orderly shutdown of loads. Power Conditioning A UPS provides continuous, regulated power to its load, under all conditions of the utility power line. Unlike other types of power conditioning equipment, ... transformers and some do not. Laura Steffek Best Power John Hecklesmiller Best Power Dave Layden Best Power Brian Young Best Power © 2002 by CRC Press LLC...

Ngày tải lên: 06/11/2013, 08:15