Modeling of active magnetic bearing in rotating payload satellite considering shaft motion coupling
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DOI 10.1007/s12206-020-1005-7
Journal of Mechanical Science and Technology 34 (11) 2020 Original Article DOI 10.1007/s12206-020-1005-7 Keywords: · Active magnetic bearing · Disturbance analysis · Refined dynamic model · Satellite with rotating payload
Modeling of active magnetic bearing in rotating payload satellite considering shaft motion coupling Yatao Zhao, Xueqin Chen, Feng Wang, Cheng Wei and Yang Zhao School of Astronautics, Harbin Institute of Technology, Harbin 150001, China
Correspondence to: Cheng Wei [email protected]
Citation: Zhao, Y., Chen, X., Wang, F., Wei, C., Zhao, Y. (2020). Modeling of active magnetic bearing in rotating payload satellite considering shaft motion coupling. Journal of Mechanical Science and Technology 34 (11) (2020) 4423~4437. http://doi.org/10.1007/s12206-020-1005-7
Abstract
This paper establishes the refined dynamic model of the five degree-of-freedom active magnetic bearing used in the earth-oriented satellite system with an unbalanced rotating payload based on the more refined air gap change model for stator motion. The disturbance effects of the thrust active magnetic bearing and the coupling effects of shaft motion are analyzed by the equivalent stiffness and damping model, especially when the satellite system is in the fine pointing phase. Numerical simulation results are provided to verify the accuracy of the proposed simplified stiffness and damping model, the disturbance term effects on active magnetic bearing, and the significance of the refined magnetic bearing dynamic model for improving the payload working ability in the fine pointing phase.
Received January 19th, 2020 Revised
May 14th, 2020
Accepted August 9th, 2020
1. Introduction
† Recommended by Editor No-cheol Park
With the rapid development of aerospace technology, the accuracy and stability demand for the attitude and position of the payload on the satellite platform continues to increase [1]. Compared with mechanical bearings, active magnetic bearings (AMBs) have the advantages of longer life, no wear, no lubrication, higher rotational speed [2, 3], and controlled dynamic characteristics [4, 5], which can be used to isolate middle–high frequency vibrations from the platform and improve the payload rotation accuracy. Thus, a five degree-of-freedom (5-DOF) AMB subsystem equipped with two radial active magnetic bearings (RAMBs) and one thrust active magnetic bearing (TAMB) is introduced to connect the satellite platform (stator) and the rotating payload (rotor) whose mass and inertia are comparable to those of the satellite platform. Meanwhile, the payload is unbalanced due to design, production, and installation errors, which cannot be completely compensated by the existing balancing technology. In the fine pointing phase, unbalanced rotating payload is the main disturbance in a satellite system. Therefore, to meet the extremely high attitude payload demand in the fine pointing phase, establishing a refined dynamic model for satellite systems that considers the AMB subsystem, which is beneficial
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