Rotating machines-power supplies for the next generation of EM accelerators

Spann, M.L.; Pratap, S.B.; Weldon, W.F.; Walls, W.A.

doi:10.1109/20.101054

Cited by 5 publications

(5 citation statements)

References 3 publications

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“…The variable k is the ratio of flux density at knee point to remanence at the corresponding temperature, and it is usually used to represent the knee point. It is assumed that parameter D (means rectangularity coefficient) and the relative permeability of the recoil line is constant, and the value of the variable k is calculated by using (5). However, this method can only be used to evaluate the approximate global demagnetization of PMs, and it is difficult to determine the local demagnetization risk.…”

Section: A Estimation Of Temperature Rise Demagnetizationmentioning

confidence: 99%

“…As we know, the pulsed power supply generally includes inductors, capacitors [3], pulsed alternators and homopolar generators [4]. The pulsed alternators integrate inertial energy storage, pulse shaping and power conditioning into one unit, and it has drawn a great deal of attentions in recent decades due to its high energy density, high repetition rate and high power density [5]- [9].…”

Section: Introductionmentioning

confidence: 99%

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Demagnetization research on PMs in the Halbach magnetized pulsed alternator

Zhao

et al. 2019

Trans. Electr. Mach. Syst.

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Section: A Estimation Of Temperature Rise Demagnetizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Demagnetization research on PMs in the Halbach magnetized pulsed alternator

Zhao

et al. 2019

Trans. Electr. Mach. Syst.

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“…The feeding of rail launchers requires the availability of generators able to supply extremely intense currents, often of impulsive waveform. The air-core pulsed alternator seems to be one of the most promising technology in the field of electromagnetic launchers power supplies [1][2][3][4]. These systems are made of non-ferromagnetic materials (usually with very high specific strength) and, in comparison with the iron-core generators, they need very high current to produce the proper exciting field [5].…”

Section: Introductionmentioning

confidence: 99%

Electromechanical Numerical Analysis of an Air-Core Pulsed Alternator via Equivalent Network Formulation

Musolino

Raugi

Rizzo

et al. 2017

IEEE Trans. Plasma Sci.

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In this paper, the numerical analysis on an air-core pulsed alternator is presented. Since compulsators are characterized by very fast electromechanical transients, their accurate analysis requires strong coupling between the equations governing the electrical and the mechanical behaviors. The device is investigated by using a dedicated numerical code capable to take into account eddy currents, compensating windings, as well as the excitation/control circuits. Furthermore, the code is capable of modeling centrifugal forces and vibrations acting on the shaft due to electric and mechanical unbalances or to misalignments of the shaft from its centered position. This makes the code a very powerful tool during the design phase. Examples of application of the code to machines with nonuniform compensating shield and with shorted compensating windings are shown

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“…Compulsator integrates the kinetic energy, electro-mechanical energy conversion and pulse shape condition in one unit, and it has several comprehensive advantages compared with the conventional capacitor and inductance energy storage [1][2][3][4]. In the range of MW-level power, the compulsators are usually aircore with solo electrical excitation [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Design of Halbach hybrid excitation compulsator

Cui

Zhao

2014

2014 17th International Symposium on Electromagnetic Launch Technology

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Pulsed alternators integrate kinetic energy storage, electromechanical energy conversion and pulse shaping in one unit, and it is the research focused on the field of pulsed power sources . The electrical excitation and the permanent magnet excitation are contained in one hybrid excitation pulsed generator together in which the advantages of two different excitation types are integrated. The brush slip ring mechanism with low reliability and high maintenance costs can be cancelled. And the electromagnetic field can be adjusted quickly by external electrical excitation source and correspondingly the performance can be quickly adjusted.An all-iron-core hybrid excitation compulsator prototype had been designed, fabricated and optimized. The hybrid excitation concept was validated in the research of compulsator. Although the compulsator researches are mainly focused on the all-air-core electrical excitation topology, there exist some bottleneck technologies which restrict the application of compulsator in actual fields. The hybrid excitation compulsator can decrease the cost, increase the reliability and widen the application scope of compulsator, especially in the middle-low power range. Halbach array is a permanent magnet arrangement structure which is a combination structure of different directions arrays. The Halbach array offers a number of attractive features in comparison with the normal array one. And the air-gap magnetic flux can be increased and the rotor yoke magnetic flux is decreased. Based on it, the Halbach array can be designed on the composite rotor core. A partair-core compulsator which includes an air-core rotor and an ironcore stator was designed. For analyzing the electromagnetic design results, the three dimensional model was built and finite element analysis method was used. The performances simulation results of the Halbach hybrid excitation compulsator were presented.

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Rotating machines-power supplies for the next generation of EM accelerators

Cited by 5 publications

References 3 publications

Demagnetization research on PMs in the Halbach magnetized pulsed alternator

Demagnetization research on PMs in the Halbach magnetized pulsed alternator

Electromechanical Numerical Analysis of an Air-Core Pulsed Alternator via Equivalent Network Formulation

Design of Halbach hybrid excitation compulsator

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