Magnetic Field Analysis of Linear Motor for High-Speed Maglev Train

In order to improve the output force characteristics of permanent magnet linear motor (PMLM), studied from permanent magnets (PMs) structure that is the key component of PMLM, different magnetization methods of single PM and different array structures of multiple PMs are compared, and a novel PMLM magnetized alone the external field force lines using 8 pieces tegular Halbach magnet array with air gaps is proposed as well. The analysis on magnetic field of PMLM shows that the force between the coil and the single PM increases by more than 40%, and the average magnetic induction in coil centre generated by the 8 pieces Halbach magnet array arrives at the maximum value, 10% higher than that of 1 piece structure.

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Electromagnetic Field Analysis and Measurement for High Speed Attraction Type Magnetic Levitation Vehicle Systems

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.295-296.655 ◽

2005 ◽

Vol 295-296 ◽

pp. 655-660

Author(s):

D.X. Chen ◽

M.C. Pan ◽

F.L. Luo ◽

Z.W. Kang ◽

W.G. Tian ◽

...

Keyword(s):

Magnetic Field ◽

High Speed ◽

Magnetic Levitation ◽

Experimental System ◽

Air Gap ◽

Field Analysis ◽

The Finite Element Method ◽

Magnetic Field Analysis ◽

Vehicle Systems ◽

The Magnetic Field

Research achievements in a high speed attraction type magnetic levitation vehicle experimental system are reported. The high speed attraction type magnetic levitation vehicle constitutes a typical long stator linear synchronous motor. The study on levitation and propulsive electromagnetic fields is of great importance and is studied. Owing to the influence of the stator grooves and the material discontinuousness, the magnetic field distribution is very complex to be analyzed in analytical forms. The magnetic fields in the air gap are determined using the finite element method. The levitation force and thrust produced by the levitation magnetic field and the propulsive magnetic field are calculated. They are found to vary following the change of the air gap and exciting current. A magnetic field strength measurement system based on a hall sensor is designed. Experimental results are compared with the results from the magnetic field analysis.

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Magnetic field analysis of Primary Permanent Magnet Linear Motor Based on Halbach Distribution

E3S Web of Conferences ◽

10.1051/e3sconf/202020402012 ◽

2020 ◽

Vol 204 ◽

pp. 02012

Author(s):

Xiuping Wang ◽

Yan Li ◽

Chuhan Yang ◽

Chunyu Qu

Keyword(s):

Magnetic Field ◽

Permanent Magnet ◽

Technical Problem ◽

Linear Motor ◽

Air Gap ◽

Field Analysis ◽

Transit System ◽

Finite Element Software ◽

Magnetic Field Analysis ◽

Air Gap Magnetic Field

The rail transit system driven by linear motor has outstanding advantages in climbing ability, traction performance, vibration and noise. However, with the increase of traffic travel and other situations, how to ensure that the linear motor still has a large thrust and stability in the air gap condition is the key technical problem. In order to solve this problem, three Halbach permanent magnet array structures are proposed and applied to the magnetic barrier coupled primary permanent magnet unilateral excitation linear motor (MBCPPMUELM). The finite element software is used for simulation and analysis. By comparing the harmonic distribution of air gap magnetic field of the three Halbach permanent magnet array motors, a topology structure with high magnetic field modulation effect is obtained It provides a useful reference for the further design and analysis of this kind of motor.

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Electromagnetic Performance Analysis of Claw-Pole Alternator with Changing Permeance

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.668.510 ◽

2013 ◽

Vol 668 ◽

pp. 510-513

Author(s):

Xiao Hua Bao ◽

Mou Zhi Liu

Keyword(s):

Magnetic Field ◽

High Speed ◽

Noise Analysis ◽

Calculation Model ◽

Air Gap ◽

Field Analysis ◽

Electromagnetic Properties ◽

Magnetic Field Analysis ◽

Field Distortion ◽

Air Gap Magnetic Field

A changing air gap permeance model of the alternator and its influence were discussed in this paper. When the alternator was under high-speed operation, taking it into consideration that the claws getting deformation for rotating centrifugal force and electromagnetic exciting force, the alternator’s changing air gap permeance model was established. And the alternator’s Maxwell3D calculation model was built. The field magnetic distribution under the rated speed was obtained as well, also before the claws’ deformation was obtained. The harmonics of the air-gap flux were analyzed and compared. The changing air gap permeance model was proved to be reasonable. It would lead to air-gap magnetic field distortion of the generator, which affected the generator’s electromagnetic properties. Instruction was provided for more precise of air gap magnetic field analysis or vibration noise analysis of alternator.

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