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Electromagnetic shields of the air-core compulsator

机译：空心型强制的电磁屏蔽

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摘要

Air-core compulsator is a specially designed generator capable of delivering high current pulses to a low-impedance load, such as the electromagnetic railgun. Due to the absence of ferromagnetic material, the field strength in air-core compulsator can reach to 4～6 T. Therefore electromagnetic shields are required to protect the surrounding operators and instruments from exposure to high magnetic fields. This paper investigates the design methodology of the shield as well as its influence on the performance of the machine. A dynamic model is built to analyze the shielding effect and its performance trade-offs of a reference compulsator. The result indicates that the effect of the eddy current shield is much better than the magnetic shield using ferromagnetic material, due to the high frequency and the magnetic saturations. The magnetic field can be completely screened inside the conducting shield, at expenses of some electrical, mechanical, and thermal performance. Since the eddy current density is sensitive to the location of the shield, the influences of the conducting shield are parametrically analyzed. By using the electromagnetic and thermal coupling field link, the temperature rise of the shield is also calculated. Analysis results can provide the theoretical guides for the shielding of the air-core compulsator investigation in the future.
机译：空气芯强制是一种专门设计的发电机，能够将高电流脉冲输送到低阻抗负荷，例如电磁轨道。由于不存在铁磁材料，空气芯强制的场强可以达到4〜6吨。因此，需要电磁屏蔽以保护周围的操作者和仪器免于暴露于高磁场。本文研究了屏蔽的设计方法以及对机器性能的影响。建立动态模型以分析参考强制性的屏蔽效果及其性能权衡。结果表明，由于高频和磁性饱和，涡流屏蔽的效果远比使用铁磁性材料的磁屏蔽好。在一些电气，机械和热性能的费用，可以在导电屏蔽内完全筛选磁场。由于涡流密度对屏蔽的位置敏感，因此参数分析导电屏蔽的影响。通过使用电磁和热耦合场连杆，还计算屏蔽的温度升高。分析结果可以为未来空中迫导型调查屏蔽的理论指南提供。

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