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Influence of Rotor Vibration on Magnetic Field Distribution of Radial Active magnetic Bearings

机译：转子振动对径向主动电磁轴承磁场分布的影响

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Coil currents of active magnetic bearing (AMB) change with the radial displacement of the rotor caused by rotor vibration, which affects the magnetic field distribution of the AMB. In order to analyze the influence of rotor radial vibration on the power loss of AMB, it is necessary to establish a relationship model between the magnetic field distribution characteristics and the rotor vibration. Considering the nonlinearity of the ferromagnetic material and the edge effect of the magnetic poles, the PID control method is used to control the currents of the stator coils in real time according to the vibration displacement of the rotor, and the nonlinear equivalent magnetic circuit model of the AMB considering the rotor and stator reluctance is established. The magnetic field distribution characteristics of AMB during rotor vibration are analyzed, and the magnetic density in air gap is obtained, and compared with the results given by the electromagnetic field finite element software. The error between the magnetic path method and the FEM analysis result is within 3%, Which has high accuracy. The model established in this paper provides a theoretical basis for the magnetic field analysis of the AMB during rotor vibration and the subsequent loss analysis.
机译：主动磁轴承（AMB）的线圈电流随转子振动引起的转子径向位移而变化，从而影响AMB的磁场分布。为了分析转子径向振动对AMB功率损耗的影响，有必要建立磁场分布特性与转子振动之间的关系模型。考虑到铁磁材料的非线性和磁极的边缘效应，采用PID控制方法根据转子的振动位移实时地控制定子线圈的电流，并采用非线性等效磁路模型。建立了考虑转子和定子磁阻的AMB。分析了转子振动过程中AMB的磁场分布特征，获得了气隙中的磁密度，并与电磁场有限元软件给出的结果进行了比较。磁路法与有限元分析结果之间的误差在3％以内，具有很高的准确性。本文建立的模型为转子振动过程中AMB的磁场分析及后续的损耗分析提供了理论依据。

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