With the aim to investigate and mitigate the disturbance induced by sun-track drive of solar array, the main factor inducing this disturbance was analyzed based on the mechanotronics model of solar array with drive assembly, and, starting with steady-state moment equilibrium equation, disturbance-mitigation drive methods for close-loop compensation and open-loop compensation by updating input signal to compensate speed fluctuation of the drive assembly were presented. The results indicate that harmonic electromagnetic torque can be approximate to the proportional control for rotation angle, and cogging effect is an important factor which causes this disturbance in drive process. Both disturbance-mitigation drive strategies are clearly capable of improving the speed stability and the disturbing torque stability without degrading the pointing accuracy of solar array, but the disturbance-mitigation effects are gradually muted as the error of cogging torque amplitude increases. Taking various factors combined into consideration, the disturbance-mitigation drive method for open-loop drive control is preferable, which could achieve the speed stability and the disturbing torque stability under 1% and 1.15%, respectively, while the error of cogging torque amplitude is below upper limit of 11%.
ZHU Shi-yao LEI Yong-jun XIE Yan LI Jia-wen.
Disturbance-Mitigation Drive Methods for Solar Array of High-precision Spacecraft[J]. Journal of Vibration and Shock, 2014, 33(21): 26-30
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