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Electromagnetic fields and thrust-ripples calculation for segmented-secondary linear flux-switching motors

Monir Sadat Hosseini (The School of Electrical Engineering, College of Engineering, University of Shahid Beheshti, Tehran, Iran)
Hamid Javadi (The School of Electrical Engineering, College of Engineering, University of Shahid Beheshti, Tehran, Iran)
Sadegh Vaez-Zadeh (The School of Electrical and Computer Engineering, University of Tehran, Tehran, Iran and Center of Excellence on Applied Electromagnetic Systems, University of Tehran, Tehran, Iran)

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering

ISSN: 0332-1649

Article publication date: 10 October 2018

Issue publication date: 24 January 2019

101

Abstract

Purpose

This paper aims to investigate analytical electromagnetic fields and thrust ripples representation of linear flux-switching motors with simple modulated secondary referred as segmented secondary linear flux-switching motor (SSLFSM).

Design/methodology/approach

SSLFSMs are applicable to transportation systems like Maglev due to their simple and consequently low-cost secondary structures and high force density. However, they have high thrust ripples that deteriorate a smooth motion in rail transportation systems. Therefore, derivation of accurate analytical models for thrust ripples minimization of the motor is essential, which is absent in the literature. In this paper, a two-dimensional analytical model is developed for this motor. The model is based on transfer relations and Fourier theory used for solving a two-dimensional boundary value problem. Certain model regions are determined by considering actual machine structure and observing specific rules. Analytical solution of Maxwell and Poison equations are then obtained in the regions.

Finding

Using the presented modeling method, the airgap electromagnetic field distribution and developed thrust of the motor are calculated for different positions of the motor as well as its thrust ripples. They are verified by the results obtained from finite element method. Also, the analytical results are compared with the presented experimental results.

Originality/value

This paper has analytically presented the airgap electromagnetic field distribution, thrust and thrust ripples of the SSLFSMs. This modeling is essential in thrust ripples minimization of the motor.

Keywords

Acknowledgements

This work was supported by ALBORZ-Province-Power-Distribution-Company.

Citation

Hosseini, M.S., Javadi, H. and Vaez-Zadeh, S. (2019), "Electromagnetic fields and thrust-ripples calculation for segmented-secondary linear flux-switching motors", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 38 No. 1, pp. 95-118. https://doi.org/10.1108/COMPEL-04-2018-0177

Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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