Design and Optimization Method with Independent Radial and Axial Capacity for 3-DOF Magnetic Bearings in Flywheel

Jintao Ju (), Peng Xu, Shuqing Li, Tong Xu, Fangming Ju and Jiahui Du
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Jintao Ju: School of Electrical and Information Engineering, Changzhou Institute of Technology, Changzhou 212031, China
Peng Xu: School of Mechanical Engineering and Rail Transit, Changzhou University, Changzhou 213164, China
Shuqing Li: School of Electrical and Information Engineering, Changzhou Institute of Technology, Changzhou 212031, China
Tong Xu: School of Electrical and Information Engineering, Changzhou Institute of Technology, Changzhou 212031, China
Fangming Ju: School of Electrical and Information Engineering, Changzhou Institute of Technology, Changzhou 212031, China
Jiahui Du: School of Electrical and Information Engineering, Changzhou Institute of Technology, Changzhou 212031, China

Energies, 2023, vol. 16, issue 1, 1-14

Abstract: The six-pole radial–axial hybrid magnetic bearing (RAHMB) has the advantages of small space and low power consumption, making it suitable for flywheel batteries. The bearing capacity and the volume are the main specifications of magnetic bearings that should be considered comprehensively. In this work, the six-pole RAHMB was used in a horizontal flywheel battery. As the axial bearing capacity is relatively smaller than the radial bearing capacity, a design method with independent radial and axial bearing capacity is proposed, and the parameters are optimized to minimize the volume. The mathematical model of six-pole RAHMB was derived from the equivalent magnetic circuit method. The relationships between bearing capacity, biased flux density, saturation flux density and the section area of magnetic poles were analyzed. The basic principle of the design method with independent radial and axial bearing capacity is to determine which five of the variables are preferred. According to the design method, one radial or axial biased flux density should be optimized to minimize the volume, and the genetic algorithm (GA) was adopted to search for the optimal value. The structural parameters were designed based on the optimized value of biased flux density. The total volume of the six-pole RAHMB was reduced by 24%. A 3D finite element (FE) model was built. The analysis results and experimental results show that the proposed design and the optimization method are feasible and valid.

Keywords: six-pole radial–axial hybrid magnetic bearing; optimization; genetic algorithm; flywheel battery (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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