scholarly journals Electromagnetic Levitation System for Active Magnetic Bearing Wheels

10.5772/67227 ◽  
2017 ◽  
Author(s):  
Yonmook Park
Keyword(s):  
Electromagnetic Levitation ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Levitation System

scholarly journals Study on Unbalanced Magnetic Pulling Analysis and Its Control Method for Primary Helium Circulator of High-Temperature Gas-Cooled Reactor

2019 ◽  
Author(s):  
Yangbo Zheng ◽  
Ni Mo ◽  
Zhe Sun ◽  
Yan Zhou ◽  
Zhengang Shi
Keyword(s):  
High Temperature ◽  
Control Method ◽  
Effective Means ◽  
Electromagnetic Levitation ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Control Effect ◽  
Significant Control ◽  
Double Frequency ◽  
High Temperature Gas

In addition to provide an extremely clean environment for primary loop of high-temperature gas-cooled reactor (HTR), the primary helium circulator (PHC) using electromagnetic levitation technology also provides an effective means for vibration control. Besides synchronous vibration produced by mass imbalance and sensor runout, double-frequency vibration produced by unbalanced magnetic pull (UMP) is serious in PHC engineering prototype (PHC-EP). In this paper, we firstly analyzed the mechanism of UMP and the multi-frequency vibration characteristics in combination with the PHC-EP. Then we put forward a distributed iterative learning control (ILC) algorithm and a parallel control scheme to suppress the periodic vibrations. Finally, we verified the methods by carrying out experimental researches on the active magnetic bearing (AMB) bench of PHC-EP. The results show that the methods put forward in this paper have significant control effect on the double-frequency vibration generated by UMP of the PHC-EP, and provide theoretical and practical references for the PHC safe operation in HTR.

scholarly journals Study on Unbalanced Magnetic Pulling Analysis and Its Control Method for Primary Helium Circulator of High-Temperature Gas-Cooled Reactor

Energies ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3682 ◽  
Author(s):  
Yangbo Zheng ◽  
Ni Mo ◽  
Zhe Sun ◽  
Yan Zhou ◽  
Zhengang Shi
Keyword(s):  
High Temperature ◽  
Control Method ◽  
Effective Means ◽  
Electromagnetic Levitation ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Control Effect ◽  
Significant Control ◽  
Double Frequency ◽  
High Temperature Gas

In addition to providing an extremely clean environment for primary loop of high-temperature gas-cooled reactor (HTR), the primary helium circulator (PHC) using electromagnetic levitation technology also provides an effective means for vibration control. Besides synchronous vibration produced by mass imbalance and sensor runout, double-frequency vibration produced by unbalanced magnetic pull (UMP) is serious in PHC engineering prototype (PHC-EP). In this paper, we firstly analyzed the mechanism of UMP and the multi-frequency vibration characteristics in combination with the PHC-EP. Then we put forward a distributed iterative learning control (ILC) algorithm and a parallel control scheme to suppress the periodic vibrations. Finally, we verified the methods by carrying out experimental researches on the active magnetic bearing (AMB) bench of PHC-EP. The results show that the methods put forward in this paper have significant control effect on the double-frequency vibration generated by UMP of the PHC-EP and provide theoretical and practical references for the PHC safe operation in HTR.

scholarly journals Control of Magnetic Bearings for Rotor Unbalance With Plug-In Time-Varying Resonators

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
Christopher Kang ◽  
Tsu-Chin Tsao
Keyword(s):  
Disturbance Rejection ◽  
Internal Model ◽  
Closed Loop ◽  
Electromagnetic Levitation ◽  
Magnetic Bearing ◽  
Open Loop ◽  
Active Magnetic Bearing ◽  
Time Varying ◽  
Periodic Disturbance ◽  
Rotational Systems

Rotor unbalance, common phenomenon of rotational systems, manifests itself as a periodic disturbance synchronized with the rotor's angular velocity. In active magnetic bearing (AMB) systems, feedback control is required to stabilize the open-loop unstable electromagnetic levitation. Further, feedback action can be added to suppress the repeatable runout but maintain closed-loop stability. In this paper, a plug-in time-varying resonator is designed by inverting cascaded notch filters. This formulation allows flexibility in designing the internal model for appropriate disturbance rejection. The plug-in structure ensures that stability can be maintained for varying rotor speeds. Experimental results of an AMB–rotor system are presented.

scholarly journals Application of the Dynamic Iterative Learning Control to the Heteroplanar Active Magnetic Bearing

2020 ◽  
Vol 53 (2) ◽  
pp. 1511-1516
Author(s):  
Lukasz Hladowski ◽  
Arkadiusz Mystkowski ◽  
Krzysztof Galkowski ◽  
Eric Rogers ◽  
Bing Chu
Keyword(s):  
Iterative Learning Control ◽  
Learning Control ◽  
Magnetic Bearing ◽  
Iterative Learning ◽  
Active Magnetic Bearing

Analysis of supercritical pitchfork bifurcation in active magnetic bearing-rotor system with current saturation

2021 ◽  
Vol 104 (1) ◽  
pp. 103-123
Author(s):  
Xiaoshen Zhang ◽  
Zhe Sun ◽  
Lei Zhao ◽  
Xunshi Yan ◽  
Jingjing Zhao ◽  
...  
Keyword(s):  
Pitchfork Bifurcation ◽  
Magnetic Bearing ◽  
Rotor System ◽  
Active Magnetic Bearing ◽  
Current Saturation
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