Development of Linear Motor for Fuel Pump System (for Reaction Control System) in Artificial Satellite

随着人造卫星的大型化和长时间运行，用于反应控制系统的机载燃料增加。因此，从重量和容量的观点来看，传统的气压式燃料供给系统在不远的将来将达到极限。本研究提出“直线马达泵系统”作为实际应用的对策与研究之一，利用直线马达驱动的泵系统来供给引擎燃料，以尝试制造高效率的轻燃料泵系统。从1991年到1992年，我们设计并生产了一台直线脉冲电机（LPM）作为试验，并进行了研究项目，目的是测量基本特性，推导和评价性能方程，建立了以系统权为目标函数的线性永磁体优化设计方法，确定了最优控制方法，得到的主要结果是： 关于我们 1.我们研制了一台4极、25 V、150 W的LPM和功率MOSFET逆变器系统，并利用我们的性能方程，确定了电机不仅按设计运行，而且实验静止推力特性与理论结果吻合良好。2.建立了直线电机动子的弹簧-质量系统，分析了动子的运动特性，给出了直线电机额定推力、冲程和共振频率之间的关系。我们还开发了控制算法，并根据理论确认了电机在小推力下的谐振运行。3.为了研究控制策略，我们在1992年安装了一个新的测试设备，包括LPM，驱动器，应变片，线性编码器和测量设备。在未来的工作中，我们将决定弹簧常数、额定推力、行程与共振频率的最佳组合，并从理论与实验上探讨最佳控制演算法。少

As artificial satellites are large-sized and operated for a long period, the fuel on board for the reaction control system increases. Therefore, a conventional gas-pressure type fuel supply system will reach the limit from the standpoints of the weight and the capacity in no distant future. This research proposes a "linear motor pump system" as one of the countermeasures and studies for the pratical usage, in which we try to make the light fuel pump system with high efficiency by using the pump system driven by the linear motor for supplying the fuel to the engine. From 1991 to 1992, we have designed and produced a linear pulse motor (LPM) as a trial and pursued the research project for the purpose of measuring the basic characteristics, deriving and appraising the performance equation, establishing the optimum design method of the LPM in which the system weight is selected for the objective function and deciding the optimum control method.Principal results obtained by this work are as … More follows; 1. We produced a 4 pole, 25V, 150W LPM and power MOSFET inverter system and made certain that not only the motor functioned as designed but also the experimental standstill thrust characteristics agreed well with the theoretical results by use of our performance equations. 2. We composed a spring-mass system for the LPM mover, analyzed the motion and showed the relation between the rated thrust of the LPM, the stroke and the resonance frequency. We also developed the control algorithm and confirmed that the motor operated resonantly with little thrust according to the theory. 3. For studying the control strategy, we installed a new test equipment consisted of a LPM, a driver, strain gauges, a linear encoder, and measuring devices in 1992. In future, we will decide the best combinations of the spring constant, the rated thrust, the stroke and the resonance frequency in the spring-mas resonance system, and investigate the optimum control algorithm theoretically and experimentally. Less