In order to measure the pulse high current in the RCEML accurately, a Rogowski coil has been design in the paper, and its principle has been analyzed. Next, the effects on parameter (the resistance, inductance) of Rogowski coil due to the current change are analyzed. Because of the particularity of coil current in the RCEML, self-integrating connection mode is adopted. Last, the fluctuant course of signal and signal distortion in the transmission line are analyzed, the way to reduce the signal distortion is presented, and the relative experiments have been performed.

Because induction motor that modulates its speed by the frequency has wide transfer speed range, high systematic efficiency, simple structure and long life, it becomes one of the best choices in the driving motors used in electrical vehicle. In present, the research trend of it is inclined to high power, high speed, high efficiency and long life. How to meet the above requirement by using the electromagnetic design, structure design and heat design, becomes a matter that needs to be resolved now. In this paper, the characters of the motor in the operation are analyzed, all kinds of factors that relate to life are laid out, its heating and loss are discussed and analyzed. The key reasons affecting the motor life are presented, and different characters of the high induction motor compared with general induction motor are reported. A design idea is described, that is: we should consider how to improve the efficiency and reliability as well as how to reduce the heating by change the electromagnet, structure, dissipation and operation of the motor. How to reduce its losses and to improve its dissipation has been presented in the paper, the result is feasible.

高速主轴电机自应用于生产实践以来，有了长足的进步，目前高频电主轴的研究方向倾向于向大功率、高转速、高效率、高钢性、高精度、长寿命等方向发展，如何采用合理的结构设计和简洁有效的加工工艺，以及优化的电磁参数设计来满足上述要求，成为当今要努力实现的课题。

目前，在世界的石油生产过程中存在所谓的用“电能换石油”的说法，能耗在采油成本中占有相当大的比重。此外，游梁式抽油机系统还存在传动链长、柔性差、在长冲程时体积和重量巨大、系统效率低等问题。针对这些问题，本文提出了以直接驱动为目的的直线电磁抽油机的研究方案。根据有杆抽油机系统的载荷特性，首次提出了以多相无刷直流直线电机为驱动元件的直线电磁抽油系统的总体结构。研制了小比例模型样机系统并进行了试验研究。结合有杆抽油系统的抽油杆柱的力学和数学模型，进行了直线电机驱动的直线电磁抽油机系统的仿真研究。理论分析和试验结果表明了新系统的可行性和有效性。探索了一条解决油田高能耗问题的新途径。

小质量的空间发射体将得益于电推动的联合体，它基于电磁发射器。电磁发射具有无污染、准备周期短、发射安全、成本低等优点，因此被称为未来的“推进技术”。本文阐述了单级重接式电磁发射的运动方程。这个重接式电磁发射器的设计和性能分析是以有限元模拟为基础的。首次仿真了线圈高度、线圈与弹丸间隙的调节对重接式电磁发射器性能的影响。在对线圈受力仿真的基础上，提出一种箱型线圈的固定方式。而且对重接式电磁发射中的弹丸的飞行过程进行仿真，发现重接式电磁发射运动中弹丸具有自稳定性，不必担心它会横动、俯仰、偏航。弹丸在垂直方向所受力总是有把弹丸校正到对称位置的趋势，因此在重接式电磁发射中不需要附加磁悬浮装置。这些研究成果对以后的重接式电磁发射的研究提供理论依据。