• Radial Flux High Temperature Superconductor Motor using Bulk Trapped Field Magnets 

      Feng, X.; Gao, G.; Davey, K.; Werst, M.; Hebner, R.; Weinstein, R.; Parks, D.; Sawh, R. (IEEE, 2009-05)
      This team has designed, built, and successfully run a radial flux high temperature superconductor (HTS) trapped field magnet (TFM) motor. The motor was run in a zero field cooled mode. This paper conveys several lessons ...
    • Railgun Current Density Distributions 

      Long, G. C.; (IEEE, 1986-11)
      A closed form solution for the magnetic field intensity and current density in an electromagnetic railgun is presented for a simple geometrical design. A constant velocity for the armature and constant material properties ...
    • Railgun Current Guard Plates: Active Current Management and Augmentation 

      Beno, J.H.; Weldon, W.F. (IEEE, 1989-06)
      A system of auxiliary conductors designed to reduce current density peaks in railgun rails is described, and the effects on rail current density and projectile force are discussed. Performance comparisons with simple ...
    • Railgun Instrumentation 

      Hotz, T.J.; Davis, D.G. (IEEE, 1995-01)
      In recent years, the railgun focus has switched to developing tactical weapons with launch velocities of 2 to 3 km/s. The projectile focus for tactical weapons has switched from plasma to solid armatures because of their ...
    • Railgun Solid Armature Scale Modeling 

      Zowarka, R.C.; Yun, H.D.; Alexander, A. (IEEE, 1997-01)
      This paper describes a methodology for using two finite element (FE) codes, MAGTRPL and DYNA, to perform electromechanic, thermal, and structural modeling of railgun solid armatures. We analyze subscale armature experiments ...
    • The Railplug: A New Ignitor for Internal Combustion Engines 

      Faidley, R.W.; Darden, M.H.; Weldon, W.F. (USDOE, 1995-01)
      A miniaturized railgun, termed the >railplug,> has been developed for use as an ignitor of combustible mixtures in engines. The device drives a plasma armature in a multishot mode with the aim of creating a line-source for ...
    • Rapid Fire Railgun For The Cannon Caliber Electromagnetic Gun System 

      Zielinski, A.E.; Werst, M.D.; Kitzmiller, J.R. (IEEE, 1995-07)
      A rapid fire railgun launcher has been designed and fabricated and a single-shot prototype has been tested for the Cannon Caliber Electromagnetic Gun (CCEMG) System. Three, five round salvos of 185 g launch packages are ...
    • A Rapid Fire, Compulsator-Driven Railgun System 

      Spann, M.L.; Pratap, S.B.; Brinkman, W.G.; Perkins, D.E.; Thelen, R.F. (IEEE, 1986-11)
      It is becoming clear that compensated pulsed alternators (compulsators) are the preferred power supply for rapid-fire railgun systems. High efficiencies, inherently high repetition rates, and the elimination of high current ...
    • Recoil in Electromagnetic Railguns 

      Weldon, W. F.; Driga, M. D.; Woodson, H. H. (IEEE, 1986-11)
      Gun designers have long accepted and understood the fact that guns experience recoil when fired, and many ingenious mechanisms have been devised to cope with the problem. But hope springs eternal, and when confronted with ...
    • Reconfiguration of shipboard power systems 

      Davey, K.R.; Hebner, R.E. (IASME, 2004-04)
      The electrical system on a ship is well contained. Among the challenges proffered by naval systems is real time monitoring for the purpose of fault analysis and reconfiguration. The power system can be considered as a grid ...
    • Reduced Order Modeling of a Shipboard Power System 

      Abdelwahed, S.; Asrari, A.; Crider, J.; Dougal, R.A.; Faruque, M.O.; Fu, Y.; Langston, J.; Lee, Y.; Mohammadpour, H.A.; Ouroua, A.; Santi, E.; Shoder, K.; et. al. (IEEE, 2013-04)
      Reduced-order average-value models form the basis of a computationally efficient approach for studying shipboard power systems. As a result of neglecting fast states, this approach generally involves solving a set of ...
    • Reduced-Order Dynamic Model of Permanent Magnet and HTSC Interaction in an Axisymmetric Frame 

      Hearn, C. S.; Pratap, S. B.; Chen, D.; Longoria, R. G. (IEEE, 2014-08)
      This paper presents a reduced order model for a permanent magnet (PM) and high-temperature superconductor (HTSC) in an axisymmetric frame. This model is formulated as a bond-graph to aid integration into system models for ...
    • Reducing Losses in a 150 kW Vehicular Flywheel Battery 

      Flynn, M.M.; Hayes, R.J. (, undated)
      Over the past several years a number of technological advancements have been made to improve flywheel energy storage designs. These include the use of high-strength composites, magnetic bearings, and rare earth magnets. ...
    • Residential PVs and EVs: Before and After 

      Uriarte, F. M.; Hebner, R. E. (, undated)
      Power distribution systems are experiencing higher load levels, unbalanced distributed generation, a wealth of load diversity, and more uncorrelated events than ever before. To provide quantitative information regarding ...
    • Rotating Machine Technologies for Integration of Pulsed and High Power Loads in Naval Electric Power Systems 

      Herbst, J.D.; Ouroua, A.; Gattozzi, A.; Pratap, S.B. (, undated)
      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 ...
    • Rotating Machines--Power Supplies for the Next Generation of EM Accelerators 

      Spann, M. L.; Pratap, S. B.; Weldon, W. F.; Walls, W. A. (IEEE, 1991-01)
      The next generation of electromagnetic launchers (EMLs) will require compact, lightweight power supplies which can generate high-magnitude, repetitive current pulses of a very specific shape. Additionally, a simple, reliable ...
    • Rotor Dynamic Synchronous Response: A More Thorough Treatment 

      Headifen, R.N.; (American Society of Mechanical Engineers, 1993-05)
      Synchronous response can be a very valuable tool for rotor dynamic analysis. It allows the user to determine rotor displacements over a wide speed range without having to perform a transient analysis at every speed increment. ...
    • Rotor Slot Permeance Harmonics under Distorted Air-Gap Flux Waveform for Cage Induction Motors 

      Liou, S.S.; Hsu, J.S.; Weldon, W.F. (IEEE, 1991)
      The air-gap flux waveform for a cage induction machine is not sinusoidal in shape and contains various harmonics, including the phase-belt harmonics, slot magnetomotive force (mmf) harmonics, slot permeance harmonics, and ...
    • Rotordynamics Design and Test Results for a Model Scale Compulsator Rotor 

      Murphy, B.T.; Kitzmiller, J.R.; Zowarka, R.C.; Hahne, J.J.; Walls, W.A. (IEEE, 2001-01)
      The model scale compulsator is a high speed (12000 rpm), high energy rotating machine. The rotor is a highly optimized pulsed power electrical machine consisting of electrical windings, slip rings, and highly pre-stressed ...
    • Salvo Fire Experiments Using a 0.60 Caliber Electromagnetic Launcher 

      Fuller, R.L.; Kitzmiller, J.R.; Pratap, S.B.; Thelen, R.F. (IEEE, 1993-01)
      A laboratory-based, small caliber electromagnetic launcher and compulsator power supply is being developed. The goal is to accelerate three 32 g masses to 2 km/s at a 10 Hz firing rate. A 0.60-caliber, series augmented, ...