Rotor vibration characteristics of brushless doubly-fed machine under unbalanced magnetic pull

被引：0
|
作者：
Ren T. [1 ,2 ,3 ]
Wu X. [1 ]
Wu S. [2 ]
Kan C. [1 ]
Tian J. [4 ]
Wang Q. [5 ]
机构：
[1] School of Electrical Engineering and Automation, Hefei University of Technology, Hefei
[2] Key Laboratory of Magnetic Suspension Technology, Maglev Vehicle Ministry of Education, Chengdu
[3] Undergraduate School, Hefei University of Technology, Hefei
[4] School of Mechanical Engineering, Hefei University of Technology, Hefei
[5] School of Electrical Engineering and Automation, Anhui University, Hefei
来源：
Dianji yu Kongzhi Xuebao/Electric Machines and Control | 2024年 / 28卷 / 04期
关键词：
brushless doubly-fed machine (BDFM); dynamic eccent-ricity; rotor system; unbalanced magnetic pull; vibration characteristics;
D O I：
10.15938/j.emc.2024.04.011
中图分类号：
学科分类号：
摘要：
When brushless dual feed is operated for a long time,the rotor shaft will bend and bear,which leads to the dynamic eccentricity of the air gap and the unbalanced magnetic pull, affecting the dynamic characteristics of the rotor system. In order to study the vibration characteristics of the rotor caused by the unbalanced magnetic pull, the Jeffcott rotor dynamic model was established to obtain the vibration differential equations of the rotor system considering the unbalanced magnetic pull, and then free vibration response was calculated. Taking a certain prototype of brushless doubly-fed machine (BDFM) as an example of size, the influence of the machine’ s air gap length, rotor material and geometric size was analyzed on the machine’ s vibration characteristics under the condition of air gap dynamic eccentricity, and the Runge-Kutta method was used to analyze the vibration differential equations. The results show that when the rotor eccentricity is small, the analytical results calculated by the vibration differential equations of the machine system are in good agreement with the numerical results, the first-order amplitude error of the rotor is only 0. 2%, and the second-order amplitude error is 2%, which can be simply calculated with the high accuracy. The conclusions provide theoretical support for highly reliable operation of the machine. © 2024 Editorial Department of Electric Machines and Control. All rights reserved.
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页码：102 / 110
页数：8
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