• Approaches to Shipboard Power Management 

      Davey, K.R.; Meek, C; Tucker, D; Shutt, B; Hebner, R.E. (2005-02)
      Shipboard power grid reconfiguration is a key ingredient for survivability, under adverse conditions, and for efficient grid operation. Two requirements surface if the procedure is to be implemented close to real time. ...
    • Design and analysis of passive homopolar null flux bearings 

      Davey, K.R.; Filatov, A.; Thompson, R.C. (IEEE, 2005-03)
      Electrodynamic Maglev systems (EDSs) and passive magnetic bearings (PMBs) generate magnetic forces by induction through the movement of permanent or superconducting magnets past conducting coils. Nearly all EDSs and PMBs ...
    • Designing Pulse Power Generators 

      Davey, K.R.; Uglum, J.R. (IEEE, 2005-08)
      When the performance criteria for a pulsed power generator is power density, and the duty cycle remains short (  s), then copper coils with an exciter are favored over permanent magnet rotors. If the permanent magnets are ...
    • Designing transcranial magnetic stimulation systems 

      Davey, K.R.; Riehl, M. (IEEE, 2005-03)
      We explain the process of designing optimized transcranial magnetic stimulation systems and outline a method for identifying optimal system parameters such as the number of turns, the capacitor size, the working voltage, ...
    • The equivalent T circuit of the induction motor: its nonuniqueness and use to the magnetic field analyst 

      Davey, K.R. (IEEE, 2006-04)
      The equivalent T circuit of an induction motor is found in every engineering motors book and is becoming increasingly important with the popularity of vector control. The values used in the circuit are used to dictate the ...
    • Fault analysis on a naval power grid using equivalent impedances 

      Davey, K.R.; (IASME, 2004-07)
      Generation High Speed Rail Program. The flywheel rotor, which weighs 5100 lb, is designed to store 130 kW-hr of energy at a top design speed of 15,000 rpm. The vertical rotor, which runs in a vacuum, is supported by a 5 ...
    • A fundamental look at energy storage focusing primarily on flywheels and superconducting energy storage 

      Davey, K.R.; Hebner, R.E. (2003-10)
      This paper compares energy storage efficiency of Superconducting Energy Storage devices (SMES) with high speed flywheels employing magnetic bearings. Both solid cylinder and shell cylinder flywheels are examined from ...
    • Generator Life and Power Electronics 

      Davey, K.R.; Jordan, H.E.; Rodriguez, R.J.; Hebner, R.E. (American Society of Naval Engineers, 2011-12)
      The deleterious effect of full bridge rectifiers on the output of an AC generator deserves attention from the Naval community. The harmonics observed at the stator of the generator not only introduce hysteresis and eddy ...
    • High Speed Generator Trade Study 

      Davey, K.R.; Herbst, J.D; Bravo, J; Ricket, R; Gamble, B. (IEEE, 2006-04)
      This document compares high temperature superconducting (HTS), permanent magnet (PM), and wound rotor (WR) designs of 5, 10, and 14 MW generators driven at 16,000 rpm, 7,000 rpm, and 7,000 rpm machines, respectively. The ...
    • Magnetic Field Stimulation - the Brain as a Conductor 

      Davey, K.R.; (, undated)
      The brain is an inhomogeneous conductor consisting of white matter, grey matter, and cerebral spinal fluid with conductivities, 0.48 S/m, 0.7 S/m, and 1.79 S/m respectively. The skull is essentially a zero current density ...
    • Modeling the effects of electrical conductivity of the head on the induced electric field in the brain during magnetic simulation 

      Davey, K.R.; Epstein, C.M.; George, M.S.; Bohning, D.E. (Elsevier, 2003-11)
      Objective: The objective of this document is to quantify the effect of changing conductivity within the brain in transcranial magnetic stimulation. Methods: Extreme examples of white and grey matter distributions as well ...
    • A new strategy for management and reconfiguration of self-contained power systems 

      Davey, K.R.; Hebner, R.E. (IEEE, 2006-07)
      Power systems on naval vessels and airplanes are good examples of self-contained power systems. These types of systems are useful for testing reconfiguration, particularly ones that might be implemented continuously, not ...
    • A new strategy for representation and control of self-contained power systems 

      Davey, K.R.; Hebner, R.E. (IEEE, 2006-07)
      Power systems on naval vessels and airplanes are good examples of self-contained power systems. State of the art LEM modules and voltage sensors provide real time current and voltage data. This paper shows how that information ...
    • Numerical design of synchronous generators 

      Davey, K.R.; Gamble, B. (IEEE, 2005-08)
      High power density applications require special treatment in design optimization. Among the critical questions is how the working torque angle will change through an optimization analysis. We present a new method for ...
    • Pulsed power electromechanics - permanent magnets versus copper coils 

      Davey, K.R.; Hebner, R.E. (2004-05)
      A number of emerging military systems operate using short, repetitive, high-power pulses. Rotating electromechanical machines incorporating inertial storage are natural candidates for supplying these high power pulses. The ...
    • 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 ...
    • Ship component optimization 

      Davey, K.R.; (, 2004-08)
      This document outlines an optimization to define the size of the components in the power train of an electric ship, specifically one appropriate for an 80 MW Destroyer. The objective is to minimize the volume of the system, ...
    • Some Benefits of Pulsed Alternators as Electromagnetic Gun Power Supplies on Power Systems for Future Electric Ships 

      Hebner, R.E.; Pappas, J.A.; Kitzmiller, J.R.; Davey, K.R.; Herbst, J.D.; Ouroua, A.; Beno, J.H. (, 2006-12)
      An electromagnetic gun provides a new component to be integrated into the power system of an electric ship. Electromagnetic guns have been fired successfully using either capacitors, inductors, or rotating machines to store ...
    • Suppressing the surface field during transcranial magnetic stimulation 

      Davey, K.R.; Riehl, M. (IEEE, 2006-02)
      Transcranial magnetic stimulation (TMS) is used commonly as both a diagnostic tool and as an alternative to electric shock therapy for the treatment of clinical depression. Among the clinical issues encountered in its use ...
    • Transient performance and loss analysis in solid wound rotor pulsed power generators 

      Davey, K.R.; (IEEE, 2006-02)
      For magnetic bearing supported flywheels, synchronous power losses can be reduced by proper use of well-established control approaches. Analysis and test results of amplifier and actuator power consumption are presented ...