Geometric modeling and electromagnetic analysis of electrical windings for pulsed alternators

Wedeking, G.A.

doi:10.1109/tmag.2004.839293

Cited by 6 publications

(2 citation statements)

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“…Moreover, even 3-D geometric modeling of the overlapping end winding is not an easy work. In [7], the UT-CEM group developed a specialized technique for creating the accurate geometric models of racetrack style electrical windings, as well as a means of using these models to perform 3-D electromagnetic load analysis of the windings.…”

Section: Introductionmentioning

confidence: 99%

A Fractional Slot Multiphase Air-Core Compulsator With Concentrated Winding

Zhao

Cui

et al. 2017

IEEE Trans. Plasma Sci.

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk This article has been accepted for inclusion in a future issue of this journal. Content is final as presented, with the exception of pagination. Abstract-Compulsator is a specially designed generator capable of delivering high current pulses to a low-impedance load, such as the electromagnetic railgun. In order to increase the tip speed of the rotor, advanced composite materials have been used in the recent compulsator prototype, which is mentioned as air core instead of the traditional iron core. For typical aircore compulsators, there are no slots and steel teeth to place the armature windings due to the nonmachinability of composite materials. Therefore, concentric windings in racetrack style are often adopted instead of traditional lap winding in most cases, since it is more convenient to be fixed by composite materials. However, overlap occurs at the end winding part for multiphase compulsators, which are not easy to be formed during the manufacture process. In this paper, a fractional slot multiphase air-core compulsator with concentrated windings is proposed and analyzed. The main advantage of fractional slot configuration is that it can offer a concentrated winding structure under certain conditions, which means each coil only spans one "tooth," and will not cause any intersection between each phase at the end winding. Two referenced fractional slot air-core compulsators with two phases, six poles, and four "slots" or eight "slots" (q = 1/3 and q = 2/3, q is the "slot" per pole per phase) are analyzed and compared with the performance of a traditional integral slot machine. The results indicated that the output voltage and self-excitation performance of a fractional slot compulsator can reach the same level with an integral slot one, and the discharging performance can reach an acceptable level. Thus, the fractional slot multiphase concept can be further used to improve the manufacture process of the winding in the future.

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Section: Introductionmentioning

confidence: 99%

A Fractional Slot Multiphase Air-Core Compulsator With Concentrated Winding

Zhao

Cui

et al. 2017

IEEE Trans. Plasma Sci.

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“…The air-core pulsed alternator has been studied for more than three decades [2], [3]. However, its optimized design theories are still rarely reported [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Optimized Design and Simulation of an Air-Core Pulsed Alternator

Zhang

et al. 2015

IEEE Trans. Plasma Sci.

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The air-core pulsed alternator has been studied for more than three decades. However, its optimized design theories are still rarely reported. The performance of the air-core pulsed alternator-based pulsed-power system is often closely associated with the electrical machine parameters, the system structure, and the load requirements. The parametric optimization of this type of alternator has a very important influence on the performance. This paper focuses on the optimization theory of the air-core pulsed alternator design, including the optimization of the magnetic field distribution, the turn number of armature winding, and the turn number of field winding. The features of the magnetic field distribution in the air-core pulsed alternators are analyzed based on the analytical expressions. By designing a ferromagnetic shield put on the outside of the stator, the radial magnetic field component increases and the circumferential one decreases. The optimization principles of the winding turn numbers are also deduced based on the system circuit and operation mode. The optimization theories are verified by systemlevel dynamic simulation. Finally, some rules are summarized, which are beneficial to the optimized design of the air-core pulsed alternator.Index Terms-Optimized design, pulsed-power supply, the air-core pulsed alternator.

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Optimized design and simulation of a GW-scale Multiphase Air-Core Pulsed Alternator

Zhang

et al. 2014

2014 17th International Symposium on Electromagnetic Launch Technology

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Geometric modeling and electromagnetic analysis of electrical windings for pulsed alternators

Cited by 6 publications

References 0 publications

A Fractional Slot Multiphase Air-Core Compulsator With Concentrated Winding

A Fractional Slot Multiphase Air-Core Compulsator With Concentrated Winding

Optimized Design and Simulation of an Air-Core Pulsed Alternator

Optimized design and simulation of a GW-scale Multiphase Air-Core Pulsed Alternator

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