3D Analytical Model of Permanent Magnet and Electromagnetic Hybrid Halbach Array Electrodynamic Suspension System

Permanent magnet machine adopting Halbach array has more sinusoidal air-gap flux density distribution and higher air-gap flux density magnitude. Compared with the equal segmented Halbach array, the fundamental magnitude of air gap flux density can be higher and distortion rate can be lower by reasonably designing each segment width in unequal segmented Halbach array. Thus, in this paper, the permanent magnet machine adopting unequal segmented Halbach array is researched. Firstly, an analytical model is established for PM machine adopting Halbach array to improve the calculation efficiency. This analytical model can be applied to the Halbach array having arbitrary pole pair number, arbitrary number of segments per pole, arbitrary segment width and arbitrary gap width between segments. Further, the calculation results for air gap flux density between analytical model and finite element method are compared to verify the analytical model. In addition, the method to determine each segment width in the unequal segmented Halbach array is proposed firstly in this paper. On this basis, effects of the gap width between segments and each segment width under one pole on air gap flux density are researched. The research conclusions will provide guidance for the design and fabrication of unequal segmented Halbach array.

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Structural Parameter Optimization of a Tubular Permanent-Magnet Linear Machine for Regenerative Suspension

Shock and Vibration ◽

10.1155/2019/5635047 ◽

2019 ◽

Vol 2019 ◽

pp. 1-11 ◽

Cited By ~ 2

Author(s):

Dongsheng Lu ◽

Hailong Zhang ◽

Jian Liu ◽

Enrong Wang

Keyword(s):

Permanent Magnet ◽

Analytical Model ◽

Structural Parameters ◽

Field Analysis ◽

Structural Parameter ◽

Element Analysis ◽

Modified Particle Swarm Optimization ◽

Halbach Array ◽

Magnetic Field Analysis ◽

Permanent Magnet Linear Motor

The regenerative suspension can effectively recover the vibration potential energy of the vehicle suspension, thus has broad prospects in application. In this paper, a tubular permanent-magnet linear motor (TPMLM) with the Halbach array magnetic pole is analyzed. The magnetic field analysis method of the excitation source separation is proposed, and then, the transient analytical model of output electromagnetic force and the external circuit characteristic under displacement excitation is established. A modified particle swarm optimization algorithm is further adopted to optimize the structural parameters of TPMLM. By comparing with the finite element analysis, the correctness of the proposed analytical model and the optimization are verified. This work lays the theoretical foundation for extensive application of the regenerative suspension.

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Finite Element Analysis and Experimental Implementation of the Cylindrical Permanent Magnet Electrodynamic Suspension System

Electromagnetics ◽

10.1080/02726340903167210 ◽

2009 ◽

Vol 29 (7) ◽

pp. 563-574 ◽

Cited By ~ 1

Author(s):

Abbas Najjar-Khodabakhsh ◽

Sadegh Vaez-Zadeh ◽

Arash Hassanpour Isfahani

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Permanent Magnet ◽

Suspension System ◽

Element Analysis ◽

Experimental Implementation ◽

Electrodynamic Suspension

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Magnetic field and electromagnetic performance analysis of permanent magnet machines with segmented Halbach array

COMPEL The International Journal for Computation and Mathematics in Electrical and Electronic Engineering ◽

10.1108/compel-06-2021-0217 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Heshan Zhang ◽

YanPeng Wang ◽

Jiying Tuo ◽

Minglei Yang ◽

Ying Ma ◽

...

Keyword(s):

Magnetic Field ◽

Permanent Magnet ◽

Analytical Model ◽

Field Distribution ◽

Magnetic Field Distribution ◽

Design Parameters ◽

Content Type ◽

Halbach Array ◽

Electromagnetic Performance ◽

The Magnetic Field

Purpose This study aims to accurately calculate the magnetic field distribution, which is a prerequisite for pre-design and optimization of electromagnetic performance. Accurate calculation of magnetic field distribution is a prerequisite for pre-design and optimization. Design/methodology/approach This paper proposes an analytical model of permanent magnet machines with segmented Halbach array (SHA-PMMs) to predict the magnetic field distribution and electromagnetic performance. The field problem is divided into four subdomains, i.e. permanent magnet, air-gap, stator slot and slot opening. The Poisson’s equation or Laplace’s equation of magnetic vector potential for each subdomain is solved. The field’s solution is obtained by applying the boundary conditions. The electromagnetic performances, such as magnetic flux density, unbalanced magnetic force, cogging torque and electromagnetic torque, are analytically predicted. Then, the influence of design parameters on the torque is explored by using the analytical model. Findings The finite element analysis and prototype experiments verify the analytical model’s accuracy. Adjusting the design parameters, e.g. segments per pole and air-gap length, can effectively increase the electromagnetic torque and simultaneously reduce the torque ripple. Originality/value The main contribution of this paper is to develop an accurate magnetic field analytical model of the SHA-PMMs. It can precisely describe complex topology, e.g. arbitrary segmented Halbach array and semi-closed slots, etc., and can quickly predict the magnetic field distribution and electromagnetic performance simultaneously.

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