Simulation of selective passive compensation (railguns)

Spikings, C.R.; Putley, D.

doi:10.1109/20.101068

Cited by 11 publications

(7 citation statements)

References 4 publications

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“…It has received continuous attentions from researchers around the world [4], [5]. Discontinuous shield or shorted compensating winding is always utilized to compress the magnetic field produced by the discharge current within the air-gap region to reduce the impedance of the armature winding, thus to increase the amplitude of the output current.…”

Section: Introductionmentioning

confidence: 99%

Pulsed Power Regulation in Selective Passively Compensated Pulsed Alternator

Yan

et al. 2012

IEEE Trans. Magn.

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The selective passively compensated pulsed alternator has wide applications in military and civil areas such as power source for electromagnetic launch, electrothermal chemical gun and plasma sprayed coating. It can produce wide range of current waveforms realized by shorted compensating windings. In this paper, two cases of winding arrangements and their corresponding circuit models are presented to further discuss on the power waveform regulations. The effects of the phase angles between different windings and the switching time on the pulsed power are presented in this paper as well. The results indicate that the output power waveform is possible to be regulated flexibly especially through the new winding arrangements proposed in this paper. This work may extend the applications of selective passively compensated pulsed alternator where different output waveforms are required.Index Terms-Power regulation, selective passively compensated pulsed alternator, winding arrangement.

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Section: Introductionmentioning

confidence: 99%

Pulsed Power Regulation in Selective Passively Compensated Pulsed Alternator

Yan

et al. 2012

IEEE Trans. Magn.

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“…In this paper, a 2-D transient FEM model is presented to predict the dynamic electrical parameters which are useful for a circuit model [3] to evaluate the output performance on specific load. In this model, the eddy current induced by transient discharge current as well as velocity effect were considered.…”

Section: Introductionmentioning

confidence: 99%

“…To understand the working mechanism and predict the performance of the compulsator, the abovementioned transient characteristics are necessary to be studied carefully. A circuit simulation model was built and the results of simulation and experiments were compared in [3]. The effects of the initial phase angle δ, armature winding selfinductance L 0 and mutual-inductance M 0 were analyzed.…”

Section: Introductionmentioning

confidence: 99%

Transient Performance of the Selectively Passive Compulsator

Yan

Tan

et al. 2012

2012 Asia-Pacific Power and Energy Engineering Conference

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Shorted compensating windings or non-uniform conductive shield can be used in a selectively passive compulsator to compensate the field produced by the armature winding, thus to reduce the impedance and increase the amplitude of the output current. The compensating effect on the inductance of the armature winding changes while the rotor rotates, so it is possible for selective compensation to output a flat top current pulse. A finite element analytical model is proposed in this paper. The electromotive force is firstly calculated. The losses in the rotor core and the eddy current induced in the compensating are analyzed under different frequencies. A flat top current pulse is provided in the armature winding to analyze the transient characteristics including inductance, eddy current and loss.

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“…Selective passive compensation [2] can be produced by short circuiting one of the rotor winding phases whilst passive compensation can be produced by short circuiting them all. Selective passive compensation has been used [3] to provide a wider, flat-topped pulse for railgun loads. As an alternative [4] a multiphase output stator can be used.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis techniques applied to a model iron-cored compulsator

et al. 1995

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Work on two aspects of iron-cored compulsators is reported. Firstly, detailed modelling and analysis of a passively compensated form of machine is considered. A coupled-circuit model is presented which allows current variation in all windings to be found. This model gives rapid numerical solutions and also permits algebraic solutions to be obtained. Comparison with experimental results is shown to be good, provided that linear conditions prevail. To account for iron saturation, a detailed finite-element model (which includes externally connected circuits) is presented. This model is shown to give good predictions of performance in all conditions. The second area of reported work concerns a passively compensated machine with 3-phase stator and compensating windings. Results for two stator connections (120' and 60') are given. It is shown that the 120' connection gives a 'long' pulse output of approximately 1.5 times the AC cycle time before loading. The 60' connection gives a shorter pulse, but of larger amplitude.

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Simulation of selective passive compensation (railguns)

Cited by 11 publications

References 4 publications

Pulsed Power Regulation in Selective Passively Compensated Pulsed Alternator

Pulsed Power Regulation in Selective Passively Compensated Pulsed Alternator

Transient Performance of the Selectively Passive Compulsator

Numerical analysis techniques applied to a model iron-cored compulsator

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