Design and Optimization of Multi-ring Permanent Magnet Bearings for High-speed rotors- A Computational Framework

Raghavendra Kamath C,1

Ritesh Bhat,1

Siddappa I. Bekinal,1*Email

Vijay G. S.,1

Tushar S. Shetty1

Mrityunjay Doddamani2

1Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal -576104, Udupi, Karnataka, India

2Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal-575025, Mangalore, Karnataka, India

* E-mail: siddappa.bekinal@manipal.edu

Abstract

This article presents a computational framework (MATLAB app) suitable for the industrial use for selecting optimum multi-ring radial and thrust permanent magnet bearings (PMB) based on two general variables (outer diameter/air gap and length of a bearing). Such an approach eliminates the usage of complex design equations and optimization methods. The detailed methodology adopted in optimizing PMB for maximum characteristics is presented with mathematical equations of force and stiffness. Then, the steps involved in the development of the computational framework are discussed in depth. Further, usage of the computational framework is explained with examples of PMB, and results obtained are validated with the mathematical model results. Regarding the mathematical model results, deviations of 2.22 % and 1.78 % are observed among the maximized radial and axial force values in the app results. Finally, the effectiveness of the proposed framework is demonstrated by discussing the case studies from the literature.

Design and Optimization of Multi-ring Permanent Magnet Bearings for High-speed rotors- A Computational Framework