计及磁路分布特性的电磁轴承解析模型建立与支撑性能影响因素研究

doi:10.19595/j.cnki.1000-6753.tces.220203

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Abstract

Active magnetic bearing (AMB) has been widely used due to its advantages of no friction, controllable damping, and long service life. Currently, the research on the magnetic field distribution of AMB mainly focus on the performance characteristics of its fixed structure. It is necessary to establish an optimization and design judgment for the structure of the electromagnetic bearing based on the dynamic operation performance requirements and the influence of the structure according to relevant research results. Therefore, this paper proposes an accurate magnetic circuit analytical model of AMB considering the magnetic circuit distribution characteristics to analyze the influence of its structure on the AMB performance.
Firstly, the concept of “pole arc coefficient” of motor design is introduced to define the stator structure of AMB, and the formula for pole area, winding area, and ampere turns by pole arc coefficient is defined. Secondly, the magnetic resistance of the air gap, stator, and rotor is calculated by considering the nonlinear permeability of core material, pole edge effect, magnetic field penetration depth, and other factors. Finally, a method to establish the electromagnetic force calculation model of AMB with different structures is proposed based on Maxwell's tension method.
In order to verify the proposed analytical model, the corresponding two-dimensional finite element model is established to compare with the analytical model in terms of the air gap magnetic density and radial electromagnetic force. The calculation results of the two methods are entirely consistent, and the maximum error is less than 3.5 %. On the other hand, a corresponding experimental platform has been built to verify the accuracy of the model. It is verified that the analytical model can meet the engineering requirements.
The linear control strategy has a poor control effect on the current stiffness coefficient and displacement stiffness coefficient of AMB in the nonlinear section. Through the established analytical model, the influence of the pole arc coefficient, air gap length, excitation current and other parameters on the electromagnetic force of AMB are studied. Then, suggestions for the optimal design of the AMB are given.
The following conclusions can be drawn from this study: (1) Under the condition that the inner diameter, outer diameter, and axial length of the AMB stator remain unchanged, the proportion of the core magnetic resistance increases with the increase of the pole arc coefficient. Because the magnetic density is square with the electromagnetic force, the influence of the pole arc coefficient on the nonlinear degree of current stiffness coefficient and displacement stiffness coefficient becomes more apparent. (2) In designing AMB, ensuring its maximum load capacity, the magnetic circuit structure with high air gap magnetic resistance should be selected as far as possible to weaken the nonlinear characteristics of the current stiffness coefficient and displacement stiffness coefficient.

Key words： Active magnetic bearing (AMB) analytical model magnetic circuit distribution supply performance

Received: 15 February 2022

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	Articles by authors
	Ge Baojun
	Yang Zihao
	Tao Dajun
	Han Jichao
	Huang Qiutong

Cite this article:

Ge Baojun,Yang Zihao,Tao Dajun等. Establishment of Analytical Model of Active Magnetic Bearing Considering Magnetic Circuit Distribution Characteristics and Study on Influencing Factors of Support Performance[J]. Transactions of China Electrotechnical Society, 2023, 38(8): 2025-2035.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.220203 OR https://dgjsxb.ces-transaction.com/EN/Y2023/V38/I8/2025

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