中国电气工程学报（英文） ›› 2023, Vol. 9 ›› Issue (2): 84-93.doi: 10.23919/CJEE.2023.000010

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  • 收稿日期:2022-03-30 修回日期:2022-05-05 接受日期:2022-05-20 出版日期:2023-06-25 发布日期:2023-06-28

Bearing Fault Numerical Model for the Closed-slot Rotor Submersible Motor*

Zhe Ke1, Bokai Guan2, Chong Di1, Jingwen Yan1, Xiaohua Bao1,*   

  1. 1. School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China;
    2. School of Electrical and Computer Engineering, The Ohio State University, Columbus OH 43210, USA
  • Received:2022-03-30 Revised:2022-05-05 Accepted:2022-05-20 Online:2023-06-25 Published:2023-06-28
  • Contact: *E-mail: sukz@ustc.edu
  • About author:Zhe Ke was born in Wuhu, China, in 1996. He received the B.Eng. degree in Electrical Engineering from Nantong University, Nantong, in 2018. He is currently pursuing the master’s degree in Electrical Engineering with the School of Electrical Engineering and Automation, Hefei University of Technology, Hefei, China. His current research interests mainly include motor bearing fault diagnosis and and cause analysis.
    Bokai Guan was born in Hubei, China, in 1998. He received the B. Eng. degree from Hefei University of Technology, Hefei, China, in 2020. He joined the Department of Electrical and Computer Engineering, The Ohio State University, Columbus, OH, USA, as a postgraduate. His current research interests include bearing fault diagnosis and machine learning.
    Chong Di was born in China. He received the B.Eng. and M.Eng. degrees from Hefei University of Technology, Hefei, China, in 2014 and 2017, respectively, and the Doctor of Science (D.Sc.) degree from Lappeenranta- Lahti University of Technology (LUT), Finland, in 2020, all in Electrical Engineering. He is currently a Researcher in the Department of Electrical Engineering, Hefei University of Technology, Hefei, China. His research mainly concerns high-speed electrical machines and modelling of electrical machines on the open-source platform.
    Jingwen Yan gotten the B.Eng. degree in Material Science from Soochow College, Suzhou, China, in 2018. She is right now seeking after the Ph.D. degree with the School of Electrical Designing and Computerization, Hefei College of Innovation, Hefei, China. Her current research interests include motor electromagnetic design, iron loss calculation and analysis, motor harmonic analysis.
    Xiaohua Bao was born in China. He received his B.Eng., M.Eng., and Ph.D. degrees in Electrical Engineering from the Hefei University of Technology, Hefei, China, in 1996, 2002, and 2008, respectively. He joined the School of Electrical Engineering and Automation, Hefei University of Technology, where he became a Professor in 2012. He was a Visiting Scholar with the Virginia Polytechnic Institute and State University, Blacksburg, VA, USA. His current research interests include motor design, magnetic field analysis, and finite-element analysis.
  • Supported by:
    *National Natural Science Foundation of China (51977055), Major Science and Technology Program of Anhui Province (201903a05020042), and Anhui Province Key Laboratory of Large-scale Submersible Electric Pump and Accoutrements.

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Abstract: A numerical model of the bearing fault of a motor with a closed-slot rotor using the finite element method (FEM) is proposed. The rotor’s radial motion can be regarded as static eccentric at the defect time points and healthy at other time points. The frequency of the harmonic component is analyzed corresponding to bearing fault in stator current according to the radial movement of the motor shaft. Moreover, the relative permeability variation region is established to achieve the radial motion of the rotor with bearing fault. Firstly, the relative permeability variation region is established in the health and static eccentric models. Then, the defect time points are estimated and the static eccentricity model by transient field is analyzed. Finally, the relative permeability of the variable region in the static eccentric model is imported into the variable region of the health model at the defect time points. The simulation results show that the air gap flux density of the bearing fault model is different from that of the health model and static eccentric models. In addition, the stator current contains harmonic components of the bearing fault. The analysis results prove the applicability of the proposed model.

Key words: Bearing fault, finite element method, relative permeability variation region, closed-slot rotor, stator current