ABE Takashi Nagasaki University, Faculty of Engineering, Assistant, 工学部, 助手 (30222649)
OYAMA Jun Nagasaki University, Faculty of Engineering, Professor, 工学部, 教授 (00037920)
|Budget Amount *help
¥1,900,000 (Direct Cost : ¥1,900,000)
Fiscal Year 1992 : ¥700,000 (Direct Cost : ¥700,000)
Fiscal Year 1991 : ¥1,200,000 (Direct Cost : ¥1,200,000)
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
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.