Browsing by Subject "pulsed power"
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Item Applications of Lightweight Composite Materials in Pulsed Rotating Electrical Generators(1987-06) Walls, W.A.; Manifold, S.M.Item Characterization of the Balcones 60 MJ Pulsed Power Supply Circuit Parameters(1987-06) Hildenbrand, D.J.The Center for Electromechanics at The University of Texas at Austin is presently working to complete the start-up testing of the 60 Megajoule (MJ) Balcones Homopolar Generator (HPG) Power Supply. Six identical homopolar generators ( HPG' s) are utilized to produce megamp current pulses for use in industrial welding and electromagnetic launch technologies (900 MW generators a lone; 10 GW generators with power conditioning). An integral part of the start-up is the determination of each generators' electrical circuit impedance. The theoretical premise, test procedures and equipment used to determine the HPG and connecting copper bus circuit parameters of equivalent capacitance (C), inductance (L), and resistance (R) are presented. Consideration is given to the aspects of equivalent capacitance modeling of the HPG. Also discussed are the effects of armature reaction and current magnetic diffusion skin depth on the determination of the values of R, L, and C.Item Continued Development of High Energy Density, Higher Current Rated Homopolar Generators at CEM-UT(1983-04) Walls, W.A.; Estes, E.G.Item Design of a Prototype 20 Tesla, Single Turn, Toroidal Field Coil for the Fusion Ignition Experiment (IGNITEX)(1989-10) Werst, M. D.; Brunson, G. W; Hsieh, K. T; Sledge, R. L; Weldon, W. F.The electromagnetic design of the fusion ignition experiment (IGNITEX)[l] combines unconventional pulsed power and magnet technologies. The experiment should produce an ignited plasma in a relatively simple and low cost way.[2,3) The proposed IGNITEX toroidal field (TF) coil is a 20 T, single tum, toroidal magnet powered by homopolar generators (HPGs). In order to demonstrate the magnet technologies, the Center for Electromechanics at The University of Texas at Austin (CEM-UT) is building a 0.06 scale prototype toroidal field coil to be powered by an existing 60 MJ, 9-MA, HPG power supply. This element of the Ignition Technology Demonstration (ITD) program is funded by the Texas Advanced Technology Program and the Texas Atomic Energy Research Foundation.Item Design of Compensated Pulsed Alternators With Current Waveform Flexibility(1987-06) Driga, M.D.; Pratap, S.B; Weldon, W.F.Item The Design, Assembly, and Testing of a Desk Model Compensated Pulsed Alternator(1979-06) Pichot, M.A.; Bird, W.L; Brennan, M; Driga, M.D; Gully, J.H; Rylander, H.G; Tolk, K.M; Weldon, W.F; Woodson, H.H.The Center for Electromechanics (CEM) at The University of Texas is currently involved in the design, fabrication, and testing of a prototype compensated pulsed alternator (compulsator). This machine, a new concept in pulsed power technology, utilizes the principles of magnetic induction and flux compression to convert rotational energy directly into electrical energy. The subject of this paper is a one-fifth scale version of the CEM prototype. This desk model compulsator is a portable demonstration machine designed to operate in the same fashion as the full scale model.Item Energy Balances in Pulsed Power Systems(1990-10) Zowarka, R.C.Item Future Trends in Pulsed Power Technology in the Center for Electromechanics, The University of Texas At Austin(1987-06) Gully, J.H.; Weldon, W.F.Item Mechanical Energy Storage and Electromechanical Energy Conversion(1980-07) Weldon, W.F.Mechanical energy storage techniques can be characterized as one of two types, either being stored statically, by deforming or straining some field; or kinetically in the velocity imparted to some mass. Characteristically static energy storage techniques are more amenable to longer term energy storage because they require no power input to sustain the stored energy while dynamic techniques are generally applicable for shorter term storage since they are dissipative (frictional losses).Item A New Approach to a High Efficiency Inductive Store(IEEE, 1991-01) Zowarka, R. C.; Kajs, J. P.; Pratap, S. B.; Price, J. H.; Weldon, W. F.; Weldon, J.; Pappas, J.A.A topology has been developed for a highly efficient inductive store suitable for pulsed-power applications. The design features high L/R ratios without having to cryogenically cool the conductors. This allows for high efficiency charging of the inductor from low-impedance DC sources such as batteries or homopolar generators. The inductor design produces very low external flux, which makes it suitable for laboratory applications where magnetic pressures on adjacent conductive structures and EM (electromagnetic) interference noise introduced into control and instrumentation systems is a concern. The inductor may be fabricated in modules for cost-effectiveness and ease of assemblyItem Numerical analysis of Conductor Response to Fast-Rising, High-Current Pulses(IEEE, 1989-06) Cook, R. W.; Bacon, J. L.Item Pulsed Power(1985) Rylander, H.G.Item Research and Development of High Performance Current Collectors for Homopolar Generators(1985-10) Gully, J.H.; Walls, W.A.Over the past five years three homopolar generators (HPGs) have been operated in our laboratory under a variety of experimental conditions. Two of the machines were routinely used as pulsed power supplies, the third machine is an experimental facility for the development of HPG components. Because of the Center for Electromechanics at The University of Texas at Austin (CEM-UT) recent move into a new facility, all three of the machines have been disassembled and inspected offering a wealth of information on the performance of high-slip-speed, high current- density current collectors. Wear rates of sintered, copper-graphite brushes running on steel slip rings as a function of current density and slip speed will be presented along with effects of slip-ring surface finish, using the brushes as a switch to close the electrical circuit and direction of current transfer. Funding for this research has been provided by the U. S. Army Research and Development Command (ARDC), Defense Advanced Research Projects Agency (DARPA), National Science Foundation (NSF), and the Texas Atomic Energy Research Foundation (TAERF).Item Rotating Machine Technologies for Integration of Pulsed and High Power Loads in Naval Electric Power Systems(0000-00-00) Herbst, J.D.; Ouroua, A.; Gattozzi, A.; Pratap, S.B.Advanced electric sensors and weapons are placing increasing demands on the electric power distribution systems of future naval vessels and energy storage is viewed as a critical technology for effective integration of IPS architectures in these platforms. This paper shows that kinetic energy storage, i.e. stored in the angular momentum of a rotating mass, can be applied in differing topologies to address a range of ship power system applications. Rotating machine technologies are presented for UPS and load leveling applications as well as for high cycle rate pulsed power applications.Item Rotating Machinery for Use in Pulsed Power(1983-04) Weldon, W.F.Item Testing Pulsed Current Conditioning to Benefit Vehicle Battery Performance(Society of Automotive Engineers, Inc., 1999) Thelen, R.F.;Calorimetric testing of pulsed power conditioning, as an influence on a battery's electrochemical transfer efficiency, is presented. The experiment used two 300 AH (ampere-hour) electric shuttle bus batteries; alternately charging and discharging at 8 to 14 kW with two charge and three discharge modes. The batteries were thermally insulated and monitored to analyze energy balance differences. The test setup, results, and analyses are reported. While slight trends were seen, improved transfer efficiencies due to pulsed currents could not be confirmed. Benefits under conditions of much higher transfer rates or for battery life cycle improvements are considered but were not tested.Item White Paper on the Armor/Anti-Armor Program(1986-01) Weldon, W.F.