大学毕业论文---由单独励磁转换为自励磁时进行了初步的探索正文.doc

摘 要 为适应未来深空探测和星际旅行的技术需要，电推进装置取代传统化学推力器已经成为航天推进领域发展的必然趋势。霍尔推力器具有高效率、高比冲以及高可靠性等优点，自从1970年成功研制以来，已经广泛用于各种实际飞行任务，成为世界各航天大国电推进装置研究中的热点，而当前我国在这方面的研究存在很大的空缺，为此哈尔滨工业大学等离子推进技术研究所从俄罗斯引进了ATON型霍尔推力器，并对其进行了深入的研究。推力器的磁场位形及磁感应强度是影响其性能的主要因素之一，通常实验室条件下采用的是单独励磁的模式，而在实际航天应用通常采用的是自励磁的模式，这样可以大大的减少推力的重量与其所携带的电源数量，因此也大大的提高了其工作稳定性，本文主要是针对由单独励磁转换为自励磁时进行了初步的探索，首先对单独励磁转换为自励磁时内线圈的空间问题进行了软件仿真与实验研究，然后根据其结果我们找出了在ATON机型上能够转换为自励磁的区域，在该区域内针对某一工况点在单独励磁模式下与自励磁模式下的工作特性进行了对比分析，最后我们对自励磁霍尔推力器放电稳定性问题进行了探索性研究。 关键词 漏磁；单独励磁；自励磁；低频振荡 Abstract In order to meet future deep-space exploration and interplanetary travel technology needs, electric propulsion thrusters to replace the traditional chemical field of space propulsion has become the inevitable trend of development. Hall thruster with high efficiency, high specific impulse and high reliability, etc has been successfully developed since 1970, and widely used for various practical mission to become the worlds space powers electric propulsion research in the hot, but the current in this area of our country is a big vacancy, Harbin Institute of Technology of Plasma propulsion technology generate from Russia introduced ATON thruster models, and its in-depth study. Magnetic field shape and the magnetic induction of the thruster is one of the main factors affecting the performance , and was usually using the separate excitation mode under laboratory conditions. But in practice it is commonly using the self-excitation whitch can the cut the number of components they carry that can greatly improve the stability of their work. This paper is directed by a preliminary exploration when the separate excitation changed to self-excitation. First, according to the convert from the excitation of the coil space problem ,we used the software simulation and experimental research, and based on the results we find the area whitch can be converted to self-excitation in the ATON models. In the region according to a particular operating point in the separate and self-excitation