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- 저자 : Jiqiang Tang (검색결과 3 건)
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Jiqiang Tang,Shaopu Zhao,Ying Wang,Kuo Wang 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.4
The rotor’s stable suspension is one of significant requirements for a magnetically suspended control momentum gyroscope (MSCMG), the gyroscopic effect is one of rotor’s prominent characteristics. To find out the relationship between rotor’s structure and gyroscopic effect, the inertia-ratio is originally presented and the relationship between the inertia-ratio and gyroscopic effects is researched. To improve the rotor’s suspension stability, the cross feedback control (CFC) method is researched based on modeling the suspension system of rotor and point out that only distributed PID control cannot make rotor’s suspension be stable due to the whirling. To suppress the gyroscopic effects more effectively and sustain the stable suspension within a wider speed range, a CFC method with pre-modulated gains is presented. All research results verify that this presented CFC method can effectively suppress the rotor’s vibration caused by its gyroscopic effects. Experimental results also indicate that a large inertiaratio is helpful to suppress rotor’s gyroscopic effect and can enhance the suspension stability to some extent. In addition, a rotor with angular momentum 200 Nms is designed for a MSCMG by optimizing its inertia-ratio. This paper will provide helpful hint for the research of high-speed rotor’s mechanical design and stable suspension.
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Jiqiang Tang,Chun’e Wang,Biao Xiang 한국자기학회 2013 Journal of Magnetics Vol.18 No.4
For magnetically suspended flywheel (MSFW) with gimballing capability, demerits of Lorentz force-type magnetic bearings and common reluctance force-type magnetic bearings are analyzed, a novel reluctance forcetype magnetic bearing (RFMB) including radial and axial magnetic bearing units with 4 separate biased permanent magnets and two conical stators is presented. By equivalent magnetic circuits’ method, its magnetic properties are analyzed. To reduce the eddy loss, it was designed as radial poles with shoes and its rotor made of Iron-based amorphousness. Although the uniformity of magnetic flux density in the conical air gap determines mainly the additional tilting torque, the maximum additional tilting torques is 0.05Nm and the rotor tilting has no influence on its forces when the rotor tilts or the maximum changes does not exceed 14% when the rotor drifts and tilts simultaneously. The MSFW with this RFMB can meet the maneuvering requirement of spacecraft theoretically.
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Tilting Control of Rotor Suspended by Complex Magnetic Bearings with Coupling Torques
Jiqiang Tang,Min Zhang,Yupeng Li,Jinji Sun 한국자기학회 2023 Journal of Magnetics Vol.28 No.1
For a novel Vernier-gimballing magnetically suspended flywheel (Vernier-gimballing MSFW) with conical magnetic bearing (MB) and Lorentz MB, the rotor’s dynamic model is constructed based on the characteristics of both coupling torque generated by conical MB and nonlinear titling torques generated by Lorentz MB. To make the high-speeding rotor tilt precisely and fast to output large moment, the Vernier-gimballing control method based on the extended state observer (ESO) combined with feedback linearization is presented originally considering torques’ complex nonlinearities, and the sliding mode control (SMC) with ESO is designed to improve the robustness of the closed-loop system. Simulations and experimental tests to verify the rightness and validity of SMC with ESO have been done and all research results indicate that the rotor can track the tilting signal faster and more accurately than classic SMC to output high precision moment.
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