Abstract Some loads with small torque and small inertia on aerospace equipment such as observation equipment, generally work within a limited angle range. Outside the working area, a separate auxiliary locking mechanism is required to lock it to avoid affecting other devices. The schemes proposed in the existing literature are all physical contact schemes with complex structure and poor stability. In this paper, a contactless locking mechanism is proposed, two designs of electromagnetic and permanent magnetic scheme are proposed according to their different excitation sources. The mathematical expressions of the torque characteristics for both of the designs are derived and unified in the analytical way, which have visually revealed the relationship between the performance and the structure parameters. The key performance parameters of the two schemes, including critical angle, peak torque and energy density, are further compared using three-dimensional finite element numerical method. The theoretical results are finally verified by experiments on a permanent magnet prototype, which proves that the design is reasonable in practical engineering.
Li Yongfei,Sun Jianfei,Li Yong等. Theoretical Analysis and Structural Comparison of Contactless Locking Mechanisms Used in Aerospace[J]. Transactions of China Electrotechnical Society, 2019, 34(14): 2894-2900.
[1] Cao Qian, Li Ming, Xu Pengmei.Design of high precision rotary pointing device driven by voice coil motors[C]//3rd International Symposium of Space Optical Instruments and Applications, 2017, 192: 429-437. [2] Yan Bo, Wang Ke, Kang Changxi, et al.Self-sensing electromagnetic transducer for vibration control of space antenna reflector[J]. IEEE/ASME Transactions on Mechatronics, 2017, 22(5): 1944-1951. [3] 李勇, 王亮, 张波, 等. 航空用盘式绕组旋转式音圈电机的热应力与热变形分析[J]. 电工技术学报, 2015, 30(12): 181-185. Li Yong, Wang Liang, Zhang Bo, et al.Analysis of thermal stress and deformation of disk winding rotary voice coil motor used in space[J]. Transactions of China Electrotechnical Society, 2015, 30(12): 181-185. [4] Shankar N S, Nair P S, Ghosal A.Dynamic inter- action of rotating momentum wheels with space-craft elements[J]. Journal of Sound and Vibration, 2008, 315: 970-984. [5] Agrawal S K, Pathak K, Franch J.A differentially flat open-chain space robot with arbitrarily oriented joint axes and two momentum wheels at the base[J]. IEEE Transactions on Automatic Control, 2009, 54(9): 2185-2191. [6] Liu Qian, Fang Jiancheng, Han Bangcheng.Novel electromagnetic repeated launch locking/unlocking device (RLLUD) based on self-locking for magnetic bearing flywheel[J]. Sensors and Actuators A- Physical, 2012, 175: 116-126. [7] Nitu S, Nitu C, Tuluca G, et al.Electromagnetic actuator with magnetic stored energy[J]. Journal of Material Processing Technology, 2007, 181: 153-158. [8] Cho D J, Woo D K, Ro J S, et al.Novel electro- magnetic actuator using a permanent magnet and an inter-locking mechanism for a magnetic switch[J]. IEEE Transactions on Magnetics, 2013, 49(5): 2229-2232. [9] 李芳, 游小杰, 李艳, 等. 航天电源控制器集成模块的控制策略及参数设计方法[J]. 电工技术学报, 2016, 31(8): 34-43. Li Fang, You Xiaojie, Li Yan, et al.Control strategy and parameter design of power conditioning unit integrated module for satellite applications[J]. Transactions of China Electrotechnical Society, 2016, 31(8): 34-43. [10] 李争, 伦青青, 薛增涛, 等. 永磁转子偏转式三自由度电机磁场和转矩特性的计算与分析[J]. 电工技术学报, 2017, 32(23): 81-90. Li Zheng, Lun Qingqing, Xue Zengtao, et al.Calculation and analysis of magnetic field and torque characteristics for 3-DOF deflection type PM motor[J]. 11 Transactions of China Electrotechnical Society, 2017, 32(23): 81-90. [11] 叶雪荣, 林义刚, 黄晓毅, 等. 航天继电器贮存过程吸合时间退化机理研究[J]. 电工技术学报, 2017, 32(11): 173-179. Ye Xuerong, Lin Yigang, Huang Xiaoyi, et al.Research on storage degradation mechanism of aerospace electromagnetic relay pick-up time[J]. Transactions of China Electrotechnical Society, 2017, 32(11): 173-179. [12] Han Weitao, Sun Jinji, Liu Xiankai, et al.A novel hybrid suspension electromagnet for middle-low speed maglev train[J]. Journal of Magnetics, 2017, 22(3): 463-471. [13] Farjond A, Bagherpour E A.Electromagnet design for magneto-rheological devices[J]. Journal of Intel- ligent Material Systems and Structures, 2016, 27(1): 51-70. [14] 张力, 阮江军, 黄道春, 等. 双盘式线圈结构快速斥力机构设计与运动特性仿真研究[J]. 电工技术学报, 2018, 33(2): 255-264. Zhang Li, Ruan Jiangjun, Huang Daochun, et al.Study on the design and movement characteristics simulation of a fast repulsion mechanism based on double-coil structure[J]. Transactions of China Elec- trotechnical Society, 2018, 33(2): 255-264. [15] 徐奇伟, 孙静, 赵蒙, 等. 混合动力车用电气无级变速器的电磁解耦优化设计[J]. 电工技术学报, 2018, 33(9): 2005-2014. Xu Qiwei, Sun Jing, Zhao Meng, et al.Electro- magnetic decoupling optimal design of electric variable transmission used for hybrid electric vehicle[J]. Transactions of China Electrotechnical Society, 2018, 33(9): 2005-2014.
2019, Vol. 34 
