Design of a self-excited, air-core compulsator for a skid-mounted repetitive fire 9 MJ railgun system

Walls, W.A.; Spann, M.L.; Pratap, S.B.; Bresie, D. A.; Brinkman, W.G.; Kitzmiller, J.R.; Herbst, J.D.; Hsieh, Kuo-Ta; Liu, H.; Manifold, S.M.; Rech, B.

doi:10.1109/20.22603

Cited by 17 publications

(2 citation statements)

References 7 publications

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“…B r is the remanence of PM material, A m is the cross-sectional area of the flux in one pole. By Equations (10) and (11), the no-load EMF could also expressed as:…”

Section: Methodsmentioning

confidence: 99%

Electromagnetic Design and Losses Analysis of a High-Speed Permanent Magnet Synchronous Motor with Toroidal Windings for Pulsed Alternator

Wan

Cui

et al. 2018

Energies

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The configuration of conventional high-speed Permanent Magnet Synchronous Motors (PMSMs) is usually long and thin, with overlong axial end winding lengths, which is not suitable for those applications that place severe restrictions on the axial length, such as pulsed alternators. This paper first studied the key design aspects of a flat-structure high-speed PMSM. The toroidalwindings, low-conductivity material of the retaining sleeve, large airgap and segmentation of magnets were studied to reduce the axial length of the motor. The division of the stator and the employment of a non-magnetic outer stator were used to improve overall performance. Then the losses of the prototype were calculated and the factors having an influence on the losses were also investigated, after which, their effects on the total loss were evaluated. The total loss could be effectively reduced by the decrease of strand number of conductors and the division of stator, while only being slightly reduced by epoxy resin pole fillers. Metal-stack pole fillers have the same effect on the reduction of rotor loss as epoxy resin, while maintaining the good thermal-conductivity of metal. In addition, the influence of the carrier frequency of the inverter on the losses was analyzed, and it was found that high carrier frequency was helpful to reduce rotor losses. Finally, a small-scale prototype was manufactured and the experimental results were provided.

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“…B r is the remanence of PM material, A m is the cross-sectional area of the flux in one pole. By Equations (10) and (11), the no-load EMF could also expressed as:…”

Section: Methodsmentioning

confidence: 99%

Electromagnetic Design and Losses Analysis of a High-Speed Permanent Magnet Synchronous Motor with Toroidal Windings for Pulsed Alternator

Wan

Cui

et al. 2018

Energies

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show abstract

“…For example, one could assume that the need for high DED is a requirement shared by the U.S. Air Force, U.S. Army, and U.S. Marines; however, this requirement may be less for the U.S. Navy with larger supportable masses and volumes aboard ships. Otherwise, the grouping of the CPAs into correct places within the application guide was done based largely upon the experience of the authors [6,10,11,12,13,14,15,16,17].…”

Section: Compulsator Missions and The Application Guidementioning

confidence: 99%

An application guide for compulsators

Kitzmiller

Pratap

2003

IEEE Trans. Magn.

Self Cite

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Focus towards advanced mobile tactical configurations for railgun power supplies has resulted in the evolution of five compulsator generations in the past fifteen years. Unfortunately, the rapid maturation of the technology has tended to dilute the relative importance and application base of previous generations. Technical variance between generations has been significant including air-core or iron-core, rotating armature or field, single or multi-phase, solid rotor or shell, and externally excited or self-excited. It is useful, therefore, to review and classify the important distinctions between the generations of machines thus allowing proper selection of the one best suited for a given application.This paper provides an overview of the evolution of compulsators developed at The University of Texas at Austin Center for Electromechanics. Features of past and present configurations are discussed, such as machine topology, method of excitation, basic switching methods, discharge pulse shapes, and potential energy and power densities. A list of potential applications is generated for all disciplines within the armed forces. This information is used to create an application guide that can be used to select appropriate compulsator options for the mission given. An extensive list of references is also provided. I. INTRODUCTIONT The University of Texas at Austin Center for Electromechanics (UT-CEM), compulsator (CPA) technology was first demonstrated as applicable to railguns with an ironcore CPA [1] that fired 80 g hybrid solid armatures at 2,000 m/s down a pair of 30-mm railguns (Fig. 1). Delivering pulsed electric power at the 1 GW level, this machine was the highest power density synchronous generator in existence at that time. This single phase, rotating field, iron core machine weighed over 12 U.S. tons and was literally orders of magnitude away from having what is estimated to be an acceptable delivered energy density (DED) for tactical applications. DED relates total energy input into the railgun with power supply system mass, and has played a large role in the rapid development of the CPA since 1985. Although completely successful, the iron-core CPA was the first and last of its generation, rendered obsolete by the development of advanced air-core platforms Manuscript received January 11, 2002. A portion of this research was carried out under the Electric Gun Program sponsored by the U.S. Army Research Laboratory through Lockheed-Martin Missile and Fire Control under contract number 4300050944. J.R. Kitzmiller and S.B. Pratap are affiliated with The University of Texas at Austin Center for Electromechanics, Austin, Texas 78758, (512) 471-4496, fax (512) 471-0781.

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A field based, self-excited compulsator power supply for a 9 MJ railgun demonstrator

et al. 1991

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Design of a self-excited, air-core compulsator for a skid-mounted repetitive fire 9 MJ railgun system

Cited by 17 publications

References 7 publications

Electromagnetic Design and Losses Analysis of a High-Speed Permanent Magnet Synchronous Motor with Toroidal Windings for Pulsed Alternator

Electromagnetic Design and Losses Analysis of a High-Speed Permanent Magnet Synchronous Motor with Toroidal Windings for Pulsed Alternator

An application guide for compulsators

A field based, self-excited compulsator power supply for a 9 MJ railgun demonstrator

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