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Finite Element Analysis of AMB Eddy-Current Loss in HTR-PM Primary Helium Circulator

[+] Author Affiliations
Jinpeng Yu, Yan Zhou, Mo Ni, Guojun Yang, Lei Zhao

Tsinghua University, Beijing, China

Paper No. ICONE26-81375, pp. V002T03A015; 7 pages
doi:10.1115/ICONE26-81375
From:
  • 2018 26th International Conference on Nuclear Engineering
  • Volume 2: Plant Systems, Structures, Components, and Materials; Risk Assessments and Management
  • London, England, July 22–26, 2018
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 978-0-7918-5144-9
  • Copyright © 2018 by ASME

abstract

In the active magnetic bearing (AMB) system, the eddy current is generated during the rotation of the rotor, which brings about the AMB loss and eddy-current magnetic field. The eddy-current magnetic field will reduce the electromagnetic force and generate the resistance torque of the AMB. Basing on the AMB of the Primary Helium Circulator (PHC) in HTR-PM, two-dimensional (2D) and three-dimensional (3D) AMB models are built and analyzed with finite element analysis (FEA) in maxwell. The 2D FEA shows that the eddy-current loss and the resistance torque increase as the rotor speed increases, and the eddy-current magnetic field will affect the air-gap magnetic field and reduce the electromagnetic force. The 3D FEA shows that dividing the rotor in insulate sheets can reduce the eddy-current loss. The loss and the sheets thickness have a linear relationship, which is different from the theoretical analysis.

Copyright © 2018 by ASME

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