Modeling and optimization of tubular linear permanent magnet eddy current brake with Halbach array

2020 ◽  
pp. 1-23
Author(s):  
Jiahao Li ◽  
Guolai Yang ◽  
Yumeng Fan
Keyword(s):  
Electromagnetic Field ◽  
Permanent Magnet ◽  
Eddy Current ◽  
Analytical Method ◽  
Structural Parameters ◽  
Parameter Analysis ◽  
Design Parameters ◽  
Braking Performance ◽  
Halbach Array ◽  
Braking Force

This paper provides an analytical method for calculating the electromagnetic field of the tubular linear permanent magnet eddy current brake. The method of separating variables based on Fourier series is used to solve the boundary value problem, and the analytical solution of electromagnetic field is obtained. The braking force is obtained by calculating the Lorentz force. Then the accuracy of the analytical method is verified by comparing the analytical solutions with the solutions obtained by finite element method (FEM). In order to improve braking performance in a limited space, the parameter analysis is carried out to investigate the influence of various structural parameters on the braking characteristics. According to the results of parameter analysis, the range of design parameters is determined. Finally, a multi-objective optimization is applied to find the optimal design parameters of the eddy current brake. The braking force increases by 27% and the volume of permanent magnet decreases by 7.7% after optimization.

Performance analysis of magnetic gear with Halbach array for high power and high speed

2020 ◽  
Vol 64 (1-4) ◽  
pp. 959-967
Author(s):  
Se-Yeong Kim ◽  
Tae-Woo Lee ◽  
Yon-Do Chun ◽  
Do-Kwan Hong
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
High Power ◽  
High Speed ◽  
Torque Ripple ◽  
Eddy Current Loss ◽  
Element Analysis ◽  
Current Loss ◽  
Halbach Array ◽  
Magnetic Gear

In this study, we propose a non-contact 80 kW, 60,000 rpm coaxial magnetic gear (CMG) model for high speed and high power applications. Two models with the same power but different radial and axial sizes were optimized using response surface methodology. Both models employed a Halbach array to increase torque. Also, an edge fillet was applied to the radial magnetized permanent magnet to reduce torque ripple, and an axial gap was applied to the permanent magnet with a radial gap to reduce eddy current loss. The models were analyzed using 2-D and 3-D finite element analysis. The torque, torque ripple and eddy current loss were compared in both models according to the materials used, including Sm2Co17, NdFeBs (N42SH, N48SH). Also, the structural stability of the pole piece structure was investigated by forced vibration analysis. Critical speed results from rotordynamics analysis are also presented.

A Study on the Characteristics of Planar Motor with Halbach Array

2011 ◽  
Vol 383-390 ◽  
pp. 1084-1089
Author(s):  
Rui Huang ◽  
Shi Hong Wu ◽  
Hai Sui ◽  
Feng Li Jiang ◽  
Bo Hu
Keyword(s):  
Density Distribution ◽  
Permanent Magnet ◽  
Flux Density ◽  
Analytical Method ◽  
Halbach Array ◽  
Flux Density Distribution

A synchronous permanent magnet planar motor (SPMPM) with Halbach array is proposed. The flux density distribution of Halbach array is obtained by analytical method; then, the characteristics of SPMPM with Halbach magnet array are evaluated. At last, the experiment results are used to verify the analysis propriety of this SPMPM. By comparison, it can be concluded that the analysis of SPMPM with Halbach magnet array is credible and feasible.

Parameter Analysis of Electromagnetic Braking Using Fully Nested and Two Way ANOVA

2014 ◽  
Vol 663 ◽  
pp. 193-197 ◽  
Author(s):  
Mohamad Zairi Baharom ◽  
M.Z. Nuawi ◽  
Gigih Priyandoko
Keyword(s):  
Statistical Analysis ◽  
Eddy Current ◽  
Parametric Study ◽  
Air Gap ◽  
Parameter Analysis ◽  
Braking Performance ◽  
Braking System ◽  
Study Results ◽  
Nested Anova ◽  
Significant Factors

This paper presents the statistical analysis that was used to define optimized parameter for the electromagnetic braking using eddy current study. It illustrates parametric study on four different parameters affecting the braking performance using eddy current which are air-gap, number of electromagnet turns, current induced and disc thickness. These four parameters are defined as the factors which contribute to the reduction of RPM speed as the effect. Fully nested ANOVA was used as the first analysis to determine two most significant factors to eddy current braking system. Then, two-way ANOVA was applied to clarify the most significant factors to be used as the controllable parameters in the verification study. Results from both ANOVA test shows that current induced and air-gap are the two most significant factors that affected braking using eddy current.

scholarly journals Eddy current loss in double-sided cored slotless type permanent magnet linear synchronous generator using analytical method

AIP Advances ◽  
2016 ◽  
Vol 7 (5) ◽  
pp. 056610 ◽  
Author(s):  
Gang-Hyeon Jang ◽  
Min-Mo Koo ◽  
Sung-Won Seo ◽  
Keyyong Hong ◽  
Jang-Young Choi
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
Analytical Method ◽  
Synchronous Generator ◽  
Eddy Current Loss ◽  
Current Loss
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