Impacts of Magnetic Flux Coupling on Force Arrangements of Radial Magnetic Bearings and Its Decoupling Control Strategies

Abstract

Abstract: Because of the magnetic flux coupling among the magnetic stator poles, the distribution of the magnetic force would suffer a great inaccuracy, which would result in the disability of the original control currents to provide an accurate restoring forces. In order to eliminate the magnetic coupling impacts, based on the Boit-Savart law， a magnetic flux distribution model was built to discuss what kind of factors would influence the magnetic field coupling. A magnetic force equivalent model with consideration of the gap variations was established. The flux coupling degree impacts on the magnetic force errors of an 8-pole magnetic bearing were analyzed. A decoupling control strategy was proposed, and its validity was tested by the ANSYS simulation and the steady state suspension test of magnetic bearings.

Key words: magnetic bearing, magnetic coupling, decoupling control, finite element analysis(FEA)

摘要： 由于磁路在磁轴承定子磁极间的耦合，磁力的分布会发生变化，致使理论模型推导的控制电流难以提供准确的回复力。基于Boit-Savart定理建立了磁场分布模型并分析了磁路耦合的影响因素；建立了考虑磁路耦合的磁力等效模型；分析了磁路耦合对磁力误差的影响，并提出了解耦控制策略；进行了电磁场仿真，验证了解耦控制的正确性；通过磁轴承稳态悬浮实验，验证了解耦控制策略的有效性。

关键词: 磁力轴承, 磁耦合, 解耦控制, 有限元分析

CLC Number:

TP211.4

JING Xuan1;TAN Yuanqiang2;ZHU Jie3. Impacts of Magnetic Flux Coupling on Force Arrangements of Radial Magnetic Bearings and Its Decoupling Control Strategies[J]. China Mechanical Engineering.

景轩1;谭援强2;朱杰3. 径向磁轴承磁路耦合对磁力的影响及其解耦控制策略[J]. 中国机械工程.

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