Final design of an air core, compulsator driven, 60 caliber railgun system

Kitzmiller, J.R.; Faidley, R. W.; Fuller, Robert L.; Headifen, G.R.; Pratap, S.B.; Spann, M.L.; Thelen, R.F.

doi:10.1109/20.100992

Cited by 29 publications

(5 citation statements)

References 4 publications

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“…The All-Air-Core one is also a two-phase, four-pole, slotless. A unique feature of the All-Air-Core PCPA is the use of two armature windings on the 0018-9464/$25.00 © 2009 IEEE stator, different from the Small Caliber compulsator fabricated by UT-CEM which has two armature windings on the rotor [5]. Inner One provides voltage for self-excitation and the outer one is used to provide the main output pulse.…”

Section: Two Prototypesmentioning

confidence: 99%

Design and Simulation of a Self-Excited All-Air-Core and Fabrication of a Separate-Excited All-Iron-Core Passive Compulsator

Cui

Cheng

2009

IEEE Trans. Magn.

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This paper presents a detailed description of design and simulation of a self-excited All-Air-Core and fabrication of a separate-excited All-Iron-Core compensated pulsed alternators (compulsator), also including the similarity and difference in configuration and principle of two prototypes. Presented are fabrication techniques, assembly processes and design methods developed specifically for pulsed power generators, including the carbon fiber rein-forced epoxy resin composite material usage of stator and rotor core in All-Air-Core compulsator, and the armature and field winding fabrication techniques and conglutination processes in All-Iron-Core compulsator. The armature winding is wound concentric winding by flat copper bars, the end-turn superposition problem solved by heating the flat copper bar to soften them for taking shape. Designs of a lightweight self-excited All-Air-Core rotating-field passive compulsator and a separate-excited All-Iron-Core compulsator for comparison have been completed. They all have rotating-field, two-phase, four-pole, and slotless armature winding and passive compensation. The heart of the self-excited All-Air-Core passive compulsator is carbon fiber rein-forced epoxy resin composite rotor which rotates at 10000 rpm or more, and that epoxy composite resin stator reduces the saturation of the compulsator, which consequently reduces transient inductance of armature winding and increasing the magnitude of pulsed current. The usage of composite material also reduces the mass of the All-Air-Core compulsator and increases the velocity of the rotor and inertial energy storage, therefore increasing the energy density and power density. Another feature of the All-Air-Core PCPA is the use of two armature windings on the stator, which allows optimization of each armature winding to its specific duty cycle. Control of self-excited process is presented as well as the synchronous control of solid-state switch in excitation circuit and discharge main circuit by the special controller. The paper presents the simulation of magnetic field at no-load and discharge instance respectively. The paper analyzes the impact of the thickness of compensation shield to the performance of compulsator. Finally, the experiment schematic of All-Air-Core compulsator system is presented.

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Section: Two Prototypesmentioning

confidence: 99%

Design and Simulation of a Self-Excited All-Air-Core and Fabrication of a Separate-Excited All-Iron-Core Passive Compulsator

Cui

Cheng

2009

IEEE Trans. Magn.

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“…With the development of air‐core CPAs, the topology of the rotating field has been chosen as the most ideal one, in which the self‐excitation mode is used to energize the field winding . The rotor is usually built by a high‐strength composite material or a nonmagnetic metal such as titanium alloy, which enables the rotor to rotate at a very high speed to improve the energy density of the machine.…”

Section: Description Of Modelsmentioning

confidence: 99%

Magnetic and conductive shielding for air‐core pulsed alternators in railgun systems

Tang

2016

IEEJ Transactions Elec Engng

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Magnetic and conductive shielding are the alternative choices for air-core pulsed alternators (air-core CPAs) in electromagnetic railgun systems. Because of the absence of ferromagnetic materials in the air-core alternators, the flux density inside can be 3-5 T. Electromagnetic shielding is needed to protect the surrounding electronic devices and humans from exposure to high oscillating magnetic fields. Electromagnetic shielding changes the distribution of the magnetic field and the corresponding winding inductance, as well as the output performance of the powering the railgun. This paper mainly concentrates on a GW-scale, fourphase air-core CPA-based railgun system. The magnetic and conductive shielding are adopted correspondingly. The effectiveness of shielding and electric performance are investigated in detail. Using the co-simulation method, an instructive comparison is made between the magnetic shield and the conductive shield, which is meaningful to the design of the electromagnetic shielding of air-core CPAs for railgun systems.

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“…Among the potential applications for railguns rapid fire systems have been discussed for a long time [1][2][3][4][5]. In fact the electric launch technology may outclass classical powder guns not only with respect to muzzle energy but also regarding the maximal cadences to be obtained.…”

Section: Introductionmentioning

confidence: 99%

The ISL Rapid Fire Railgun Project RAFIRA Part II: First Results

Schneider

Woetzel

Wenning

2008

2008 14th Symposium on Electromagnetic Launch Technology

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This paper reports on the rapid fire railgun (RAFIRA) project recently launched at ISL with the aim of investigating the multishot capacity of the armature technology used at the ISL. The latter is characterized by the use of multiple metal fiber brush armatures. The project started with the development of a new medium caliber launcher (25 mm x 25 mm) named RAFIRA and a suitable loading system, as described in part I of the set of papers. This part II summarizes the major results obtained with RAFIRA in single-shot mode and briefly explains the method of optimizing its performance. The experimental realization of the loading system described in part I is presented. First results regarding the performance of this loader are presented. Suitable conditions allowing multishot experiments were worked out. The paper concludes by presenting the first multishot experiments performed using the ISL armature technology. Already in the first tests, RAFIRA has accelerated projectiles up to more than 1000 m/s, while achieving cadences around 30 Hz. The sliding contact performance of these experiments is briefly discussed.

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Final design of an air core, compulsator driven, 60 caliber railgun system

Cited by 29 publications

References 4 publications

Design and Simulation of a Self-Excited All-Air-Core and Fabrication of a Separate-Excited All-Iron-Core Passive Compulsator

Design and Simulation of a Self-Excited All-Air-Core and Fabrication of a Separate-Excited All-Iron-Core Passive Compulsator

Magnetic and conductive shielding for air‐core pulsed alternators in railgun systems

The ISL Rapid Fire Railgun Project RAFIRA Part II: First Results

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