Research on stability for the switching power amplifier with solid-core active magnetic bearing

被引：0
|
作者：
Ji L. [1 ]
Ma X.-Q. [1 ]
Chen Z.-M. [2 ]
机构：
[1] School of Information Engineering, Hangzhou Dianzi University, Hangzhou
[2] ZYEC-EML Technologies Co. Ltd., Hangzhou
来源：
Dianji yu Kongzhi Xuebao/Electric Machines and Control | 2022年 / 26卷 / 10期
关键词：
eddy current effect; fractional order; high frequency oscillation; high-speed magnetic levitation motor; power amplifier; solid-core;
D O I：
10.15938/j.emc.2022.10.013
中图分类号：
学科分类号：
摘要：
For the performance variations between solid-core stator active magnetic bearing ( AMB ) and that of silicon steel sheet one, the stability of excitation current control system and the mechanism of high frequency current oscillation are studied. Firstly, a fractional order model of the windings was proposed including the eddy-current effects of a solid-core AMB. Then the stability and self-oscillation of the current-loop control system were analyzed based on the eigenvalue stability criterion while the control delay was considered. For verification, a prototype of the current-loop control system was developed, and the experiments regarding to current response were carried out. The results show that the solid core stator deteriorates the stability of the excitation current control system, the stability range of the controller is smaller, and the excitation current is more prone to self-excitation oscillation. In addition, reducing the delay caused by digital control can greatly improve the stability of the system. © 2022 Editorial Department of Electric Machines and Control. All rights reserved.
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页码：111 / 118
页数：7
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