Power Electronic Handbook P11

... used for constant-speed applications. With recent improvements in semiconductor technology and power electronics, the induction machine is seeing wider use in variable-speed applications [6]. This ... constant equal to as it is in (11.10), the result is the power invariant transformation. By using this transformation, the calculated power in the abc coordinate system is equal to that co...

Ngày tải lên: 23/10/2013, 16:15

... 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 be controlled ... 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 a...

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 ... Rajapandian Ayyanar, Amit Kumar Jain Overview • Power Quality Considerations • Passive Harmonic Filters • Active Filters for Power Conditioning • Unity Power Factor Rectification 18 Photo...

Ngày tải lên: 19/10/2013, 18:15

... © 2002 by CRC Press LLC 8 Sliding-Mode Control of Switched-Mode Power Supplies 8.1 Introduction 8.2 Introduction to Sliding-Mode Control 8.3 Basics of Sliding-Mode ... Stability Condition 8.8 General-Purpose Sliding-Mode Control Implementation 8.9 Conclusions Switch-mode power supplies represent a particular class of variable structure systems (VSS), and they can take ... Padova Paolo Mat...

Ngày tải lên: 19/10/2013, 18:15

... (Brushless DC Machines/Electronics) 10.1 Introduction 10.2 Machine Construction Permanent Magnets • Stator Windings 10.3 Motor Characteristics Mathematical Model 10.4 Power Electronic Converter ... with induction motors in the fractional horsepower range. The former will have better efficiency and better power factor and, therefore, a greater output power for the same frame, because th...

Ngày tải lên: 23/10/2013, 16:15

... 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 ... the threshold level appropriately. 13.8 Applications The simple motor structure and inexpensive power electronic requirement have made the SRM an attractive alternative to both AC and DC ma...

Ngày tải lên: 27/10/2013, 23:15

... 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 of the power into each phase: (12.8) and the power output of the machine is (12.9) where ω rm ... magnet motor drives, IEEE Trans. Ind. Electron., 35(4), 537–541, 1988. 3. B. K. Bose, Ed., Power Electron...

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

... computer disk drives and the like. The power level for these drives usually range below 20 to 30 kW; however, drives with slightly lower control quality usually have power levels below 50 to 60 kW. Servo ... magnet (PM) DC motors, permanent magnet synchronous motors or, rarely, induction motors. For low -power appli- cations stepping motors can be used, but this type of motor exhibits a...

Ngày tải lên: 06/11/2013, 08:15

... consumes twice the power of exciting the motor one phase on at a time. Exciting a three-phase motor with two phases on at a time produces no additional torque but also consumes twice the power of exciting

Ngày tải lên: 06/11/2013, 08:15