Self-excitation and energy recovery of air-core compulsators

Zhao, Weiduo and Wu, Shaopeng and Cui, Shumei and Gerada, C. and Zhang, He and Xu, Zhuang (2017) Self-excitation and energy recovery of air-core compulsators. IEEE Transactions on Plasma Science . ISSN 0093-3813 (In Press)

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Abstract

As power supplies, compulsators are popular choices for high-end railgun power supplies. In order to increase power and energy density, air-core compulsators are proposed by using composite materials instead of traditional iron-core compulsators. Due to the absence of ferromagnetic material, the flux density in the air-core compulsator can reach to 4–6 T instantaneously, which is much higher than the saturation field strength in traditional iron-core machines. Therefore, self-excitation topology is essential for the air-core compulsator to obtain up to 100-kA field current. This paper carried out research on the key parameters of self-excitation efficiency first, and then focus on the large magnetic energy remained in the inductive field winding after one shot, an implementation scheme and control strategy of energy recovery of air-core compulsator was proposed and analyzed. By controlling the field rectifier working at active inverter state after one discharge process, the magnetic energy stored in the field winding can be converted to rotor kinetic energy again. The simulation results indicate that the energy recovery efficiency can reach to 70% for a reference air-core compulsator. The continuous discharge number of times increased from 3 to 4 during one kinetic energy charging, which means that the delivered energy density increases 33.3%.

Item Type: Article
Additional Information: c2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
Keywords: Compulsators, Electromagneticlaunch, Energy recovery, Railguns, Self-excitation
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Electrical and Electronic Engineering
Identification Number: 10.1109/TPS.2017.2700027
Depositing User: Burns, Rebecca
Date Deposited: 30 Jun 2017 09:50
Last Modified: 12 Oct 2017 23:53
URI: http://eprints.nottingham.ac.uk/id/eprint/43865

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