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为实现P70霍尔推力器自励模式稳定放电运行,分别设计了满足自励模式放电要求的磁路和电路。其磁路设计是基于霍尔推力器他励运行模式最优放电性能参数和磁势不变原理,采用FEMM有限元磁场计算软件建模,将推力器内铁心半径由7 mm减至4 mm,可得到满足自励模式运行要求的优化磁场。针对电磁线圈串入主放电回路不同位置对放电的影响,考虑电磁线圈绝缘要求,提出将电磁线圈串入放电电源负极性端,整体电路设计可使放电可靠。性能对比实验表明,自励模式与他励模式性能接近,在放电电压为420V时,自励模式最高效率达到61%。自励模式实验获得了稳定放电,且放电电流低频振荡幅值很小。
In order to realize the stable discharge operation of P70 Hall thruster self-excitation mode, the magnetic circuits and circuits that meet the self-excitation mode discharge requirements were designed respectively. The magnetic circuit design is based on the optimal discharge performance parameters and magnetic potential invariance principle of Hall thruster excitation mode. The magnetic field of the thruster is reduced from 7 mm to 4 mm using FEMM FEM software. Can be optimized to meet the self-excitation mode of operation of the magnetic field. Aiming at the influence of the electromagnetic coil in different positions of the main discharge circuit on the discharge, considering the requirement of the electromagnetic coil insulation, it is proposed to string the electromagnetic coil into the negative terminal of the discharge power supply. The overall circuit design can make the discharge reliable. Performance comparison experiments show that the self-excitation mode and excitation mode performance close to the discharge voltage of 420V, self-excitation mode, the maximum efficiency of 61%. Self-excitation mode experiments obtained a stable discharge, and discharge current low-frequency oscillation amplitude is small.