Designing and Experimental Verification of the Axial Hybrid Magnetic Bearing to Stabilization of a Magnetically Suspended Inertially Stabilized Platform

2016 ◽  
Vol 21 (6) ◽  
pp. 2881-2891 ◽  
Author(s):  
Jinji Sun ◽  
Chune Wang ◽  
Yun Le
Keyword(s):  
Experimental Verification ◽  
Magnetic Bearing ◽  
Stabilized Platform ◽  
Inertially Stabilized Platform

scholarly journals Coupling Analysis and Cross-Feedback Control of Three-Axis Inertially Stabilized Platform with an Active Magnetic Bearing System

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Tong Wen ◽  
Biao Xiang ◽  
Waion Wong
Keyword(s):  
Feedback Control ◽  
Vibration Isolation ◽  
Base Plate ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Single Input Single Output ◽  
Control Scheme ◽  
Amb System ◽  
Stabilized Platform ◽  
Inertially Stabilized Platform

An active magnetic bearing (AMB) system is used to suspend the yaw gimbal of three-axis inertially stabilized platform (ISP) to minimize the friction. The dynamic functions of three gimbals in ISP are developed. The base coupling at dynamic base plate is stronger than that at static base plate, and the gimbal coupling among three gimbals increases with the number of unlocked gimbals. Therefore, a cross-feedback control scheme is designed to minimize the base coupling and the gimbal coupling, and then the multi-input multioutput system of three-axis ISP with coupling terms is simplified into three decoupled single-input single-output systems. Experimental results verify that the yaw gimbal suspended by AMB system has better vibration isolation ability than the roll gimbal supported by mechanical bearing, and the gimbal coupling and the base coupling are effectively suppressed by the cross-feedback control scheme.

The disturbance rejection of magnetically suspended inertially stabilized platform

2016 ◽  
Vol 40 (2) ◽  
pp. 565-577 ◽  
Author(s):  
Qingyuan Guo ◽  
Gang Liu ◽  
Biao Xiang ◽  
Hu Liu ◽  
Tong Wen
Keyword(s):  
Disturbance Rejection ◽  
Disturbance Observer ◽  
Angular Displacement ◽  
External Disturbance ◽  
Magnetic Bearing ◽  
Feedback Compensation ◽  
The Cross ◽  
Stabilized Platform ◽  
Inertially Stabilized Platform ◽  
Disturbance Torque

In a magnetically suspended inertially stabilized platform, the yaw gimbal is suspended by the magnetic bearing, which can effectively isolate the external vibrations and disturbances. However, coupling torques and disturbance torques among gimbals still exist. Therefore, based on the cross feedback compensation, the output angles of gimbals are introduced as feedback variables, and the inverse coordinate transformation matrix is designed to compensate for the coupling torques. Furthermore, a disturbance observer is applied to inhibit the disturbance torque and simulations indicate that the disturbance observer can accurately estimate the disturbance torque. Consequently, the experimental results demonstrate that the cross feedback compensation can inhabit the coupling torques, and the disturbance observer greatly suppresses the external disturbance torques and improves the angular displacement precision of gimbals.

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