Optimal Design of High-Speed Double-Sided Linear Permanent Magnet Motors With Segmented Trapezoidal Magnetic Poles

Dunhuang Xu,Ming Yan,Dong Wang

doi:10.1109/access.2021.3083506

Dunhuang Xu, Ming Yan + Show 1 more

Open Access

https://doi.org/10.1109/access.2021.3083506

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Abstract

For the kilometer-level electromagnetic launch system, a high-speed double-sided linear permanent magnet (PM) linear motor is presented in this paper. To enhance the average thrust force, reduce the thrust ripple and normal force of linear motor, a segmented trapezoidal PM shaping method is proposed. Compared with conventional PM shaping method, the segmented trapezoidal PMs achieves less force ripple, greater average force and lower manufacturing difficulty. The risk of PM demagnetization fault has been taken into account. To reduce the losses in the mover of the linear motor, a non-metallic light-weight mover structure is proposed. The effectiveness of segmented trapezoidal PMs and non-metallic light-weight mover are verified by the finite element method and experiment.

Highlights

The electromagnetic launch system (EMLS) is a revolutionary launch system, which can accelerate the target objects to high speed in a short distance
The rated thrust of the linear motor is 80 kN, and the weight of the mover is expected to be less than 250kg
To reduce the thrust ripple and enhance the average thrust force of the LPPM, a novel segmented trapezoidal permanent magnet (PM) shaping method is proposed in this paper

Summary

INTRODUCTION

The electromagnetic launch system (EMLS) is a revolutionary launch system, which can accelerate the target objects to high speed in a short distance. To reduce the thrust ripple and enhance the average thrust force of the LPPM, a novel segmented trapezoidal PM shaping method is proposed in this paper. To clarify the effectiveness of the novel PM shaping method, the optimization analysis focus on the segmented trapezoidal PMs. The basic design parameters of the LPPM are listed in the Tab. 2. Due to the optimal design of segmented trapezoidal PM pole, the on-load force ripple can be reduced to within the 0.5% of the average thrust force. For the LPPM adopted magnetic levitation technology, the offset normal force on the mover is a main design parameter of the additional guide device in the high-speed EMLS. Based on the example E, the final design scheme of the segmented trapezoidal PMs in the proposed LPPM is shown in the Fig. 14. The PMs and framework are covered by fiberglass cloth and epoxy resins

EXPERIMENT

Findings

CONCLUSION