Multi-Physics Coupling Dynamics Simulation of Thermally Induced Vibration of Magnetically Suspended Rotor in Small and Micro Nuclear Reactors
The power conversion system of a small micro-reactor has strict requirements on the compactness of the rotating mechanical support. Although the active magnetic bearing is an ideal choice, the thermally induced vibration caused by it may destroy the stability of the system. As such, this study propo...
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| author | Yihao Xu Zeguang Li Dianchuan Xing |
| author_facet | Yihao Xu Zeguang Li Dianchuan Xing |
| author_sort | Yihao Xu |
| collection | DOAJ |
| description | The power conversion system of a small micro-reactor has strict requirements on the compactness of the rotating mechanical support. Although the active magnetic bearing is an ideal choice, the thermally induced vibration caused by it may destroy the stability of the system. As such, this study proposes a multi-physics coupling simulation framework, which integrates electromagnetic, thermal, and mechanical multi-physics coupling mechanisms and quantifies the stability of the system under thermal-induced vibration in the frequency domain. Firstly, the equivalent magnetic circuit and electromagnetic finite element modeling and calculation of the compressor rotor are carried out. In the case of the maximum AC current of 10 A, the equivalent stiffness of the magnetic pole is 4.21 × 10<sup>8</sup> N/m and 2.1 × 10<sup>8</sup> N/m, and the eddy current loss of the rotor is 4.17496 W. Based on the eddy current loss, a magneto-thermal coupling model is established to reveal the temperature gradient distribution and the thermal sensitivity coefficient of the journal is 0.006. Subsequently, the thermal stress and equivalent stiffness are coupled to the rotor dynamics equation, and the maximum amplitude of the rotor is obtained at a value of 0.001 mm. Finally, the critical stability threshold of the system is determined by a Nyquist diagram, and the results show that the system is stable as a whole. In this paper, the quantitative analysis of the cross-scale coupling mechanism of electromagnetic, thermal, and mechanical multi-physical fields is realized, which provides a systematic analysis method for the thermally induced vibration of magnetically suspended rotors and has important engineering significance for high power density rotating mechanical systems in small micro-reactors. |
| format | Article |
| id | doaj-art-57334bd7aaf84f40ae6f797e3a0137a8 |
| institution | Kabale University |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-57334bd7aaf84f40ae6f797e3a0137a82025-08-20T03:47:52ZengMDPI AGEnergies1996-10732025-05-011810243310.3390/en18102433Multi-Physics Coupling Dynamics Simulation of Thermally Induced Vibration of Magnetically Suspended Rotor in Small and Micro Nuclear ReactorsYihao Xu0Zeguang Li1Dianchuan Xing2Department of Engineering Physics, Tsinghua University, Beijing 100084, ChinaDepartment of Engineering Physics, Tsinghua University, Beijing 100084, ChinaNuclear Power Institute of China, CNNC, Chengdu 610213, ChinaThe power conversion system of a small micro-reactor has strict requirements on the compactness of the rotating mechanical support. Although the active magnetic bearing is an ideal choice, the thermally induced vibration caused by it may destroy the stability of the system. As such, this study proposes a multi-physics coupling simulation framework, which integrates electromagnetic, thermal, and mechanical multi-physics coupling mechanisms and quantifies the stability of the system under thermal-induced vibration in the frequency domain. Firstly, the equivalent magnetic circuit and electromagnetic finite element modeling and calculation of the compressor rotor are carried out. In the case of the maximum AC current of 10 A, the equivalent stiffness of the magnetic pole is 4.21 × 10<sup>8</sup> N/m and 2.1 × 10<sup>8</sup> N/m, and the eddy current loss of the rotor is 4.17496 W. Based on the eddy current loss, a magneto-thermal coupling model is established to reveal the temperature gradient distribution and the thermal sensitivity coefficient of the journal is 0.006. Subsequently, the thermal stress and equivalent stiffness are coupled to the rotor dynamics equation, and the maximum amplitude of the rotor is obtained at a value of 0.001 mm. Finally, the critical stability threshold of the system is determined by a Nyquist diagram, and the results show that the system is stable as a whole. In this paper, the quantitative analysis of the cross-scale coupling mechanism of electromagnetic, thermal, and mechanical multi-physical fields is realized, which provides a systematic analysis method for the thermally induced vibration of magnetically suspended rotors and has important engineering significance for high power density rotating mechanical systems in small micro-reactors.https://www.mdpi.com/1996-1073/18/10/2433small micro-reactoractive magnetic bearingthermally induced vibrationmulti-physics coupling simulationstability analysis |
| spellingShingle | Yihao Xu Zeguang Li Dianchuan Xing Multi-Physics Coupling Dynamics Simulation of Thermally Induced Vibration of Magnetically Suspended Rotor in Small and Micro Nuclear Reactors Energies small micro-reactor active magnetic bearing thermally induced vibration multi-physics coupling simulation stability analysis |
| title | Multi-Physics Coupling Dynamics Simulation of Thermally Induced Vibration of Magnetically Suspended Rotor in Small and Micro Nuclear Reactors |
| title_full | Multi-Physics Coupling Dynamics Simulation of Thermally Induced Vibration of Magnetically Suspended Rotor in Small and Micro Nuclear Reactors |
| title_fullStr | Multi-Physics Coupling Dynamics Simulation of Thermally Induced Vibration of Magnetically Suspended Rotor in Small and Micro Nuclear Reactors |
| title_full_unstemmed | Multi-Physics Coupling Dynamics Simulation of Thermally Induced Vibration of Magnetically Suspended Rotor in Small and Micro Nuclear Reactors |
| title_short | Multi-Physics Coupling Dynamics Simulation of Thermally Induced Vibration of Magnetically Suspended Rotor in Small and Micro Nuclear Reactors |
| title_sort | multi physics coupling dynamics simulation of thermally induced vibration of magnetically suspended rotor in small and micro nuclear reactors |
| topic | small micro-reactor active magnetic bearing thermally induced vibration multi-physics coupling simulation stability analysis |
| url | https://www.mdpi.com/1996-1073/18/10/2433 |
| work_keys_str_mv | AT yihaoxu multiphysicscouplingdynamicssimulationofthermallyinducedvibrationofmagneticallysuspendedrotorinsmallandmicronuclearreactors AT zeguangli multiphysicscouplingdynamicssimulationofthermallyinducedvibrationofmagneticallysuspendedrotorinsmallandmicronuclearreactors AT dianchuanxing multiphysicscouplingdynamicssimulationofthermallyinducedvibrationofmagneticallysuspendedrotorinsmallandmicronuclearreactors |