An analytic expression of inductance gradient for rail-type electromagnetic launcher

Jianxin Nie; Jingjing Han; Qingjie Jiao; Jun Li; Jianfeng Qin

doi:10.1109/TPS.2010.2100048

An analytic expression of inductance gradient for rail-type electromagnetic launcher

Jianxin Nie^*, Jingjing Han, Qingjie Jiao, Jun Li, Jianfeng Qin

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

The rail-type electromagnetic launcher (EML) has good development and applied prospects for military and civilian dual purpose. The inductance gradient is an important parameter to design the EML structure and evaluate the system performance. Based on the BiotSavart law and current skin-effect behavior, we derive an analytic formula to predict the EML inductance gradient, which expands Batteh's formula by introducing rail thickness w and skin depth δ. Our expression is more accurate because the geometrical parameters of both rails and armature are considered in this paper. We investigate the inductance gradient change as a function of the ratio of bore width to height s/h_a, rail thickness w, and two-rail interval s. Finally, our results at different scales are compared with those of other formulas of the inductance gradient. This paper could be used directly to design and optimize the rail-type EML.

Original language	English
Article number	5699405
Pages (from-to)	931-934
Number of pages	4
Journal	IEEE Transactions on Plasma Science
Volume	39
Issue number	3
DOIs	https://doi.org/10.1109/TPS.2010.2100048
Publication status	Published - Mar 2011
Externally published	Yes

Keywords

Armature
electromagnetic launcher (EML)
inductance gradient
rail
skin effect

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10.1109/TPS.2010.2100048

Cite this

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abstract = "The rail-type electromagnetic launcher (EML) has good development and applied prospects for military and civilian dual purpose. The inductance gradient is an important parameter to design the EML structure and evaluate the system performance. Based on the BiotSavart law and current skin-effect behavior, we derive an analytic formula to predict the EML inductance gradient, which expands Batteh's formula by introducing rail thickness w and skin depth δ. Our expression is more accurate because the geometrical parameters of both rails and armature are considered in this paper. We investigate the inductance gradient change as a function of the ratio of bore width to height s/ha, rail thickness w, and two-rail interval s. Finally, our results at different scales are compared with those of other formulas of the inductance gradient. This paper could be used directly to design and optimize the rail-type EML.",

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author = "Jianxin Nie and Jingjing Han and Qingjie Jiao and Jun Li and Jianfeng Qin",

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AU - Han, Jingjing

AU - Jiao, Qingjie

AU - Li, Jun

AU - Qin, Jianfeng

PY - 2011/3

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AB - The rail-type electromagnetic launcher (EML) has good development and applied prospects for military and civilian dual purpose. The inductance gradient is an important parameter to design the EML structure and evaluate the system performance. Based on the BiotSavart law and current skin-effect behavior, we derive an analytic formula to predict the EML inductance gradient, which expands Batteh's formula by introducing rail thickness w and skin depth δ. Our expression is more accurate because the geometrical parameters of both rails and armature are considered in this paper. We investigate the inductance gradient change as a function of the ratio of bore width to height s/ha, rail thickness w, and two-rail interval s. Finally, our results at different scales are compared with those of other formulas of the inductance gradient. This paper could be used directly to design and optimize the rail-type EML.

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An analytic expression of inductance gradient for rail-type electromagnetic launcher

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Keywords

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