Performance analysis and optimization of secondary U-shaped double-sided toroidal winding linear permanent magnet vernier machine

• Published in: Engineering science and technology, an international journal Vol. 59; p. 101885
• Main Authors: Xu, Xiaozhuo, Miao, Sen, Jiang, Siyuan, Feng, Haichao, Ai, Liwang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2024; Elsevier
• Subjects: Linear permanent magnet vernier machine; Low speed and high thrust; Optimized design; Performance analysis; Toroidal winding; Optimized design; Low speed and high thrust; Performance analysis; Toroidal winding; Linear permanent magnet vernier machine
• DOI: 10.1016/j.jestch.2024.101885
• ISSN: 2215-0986

Aiming at the issues of low thrust density, significant thrust ripple, the lengthy end and the large axial attraction force in conventional single-sided distributed winding linear permanent magnet vernier machine (LPMVM), this paper presents an enhanced U-shaped double-sided toroidal winding linear permanent magnet vernier machine (US-DTWLPMVM). Firstly, the topology of US-DTWLPMVM is introduced and the flux concentration effect of the U-shaped permanent magnet structure is analyzed using the equivalent magnetic circuit method. The operation principle of US-DTWLPMVM is analyzed based on the principle of magnetic field modulation. Subsequently, the US-DTWLPMVM multi-objective optimization is performed using the Taguchi-RSM-Egret Swarm Optimization Algorithm (ESOA). Then, combined with the surface-mounted and Halbach PM structure double-sided toroidal winding linear permanent magnet vernier machine (DTWLPMVM), the impact of the U-shaped permanent magnet structure on the magnetic field and the resulting differences in thrust performance of the DTWLPMVM are investigated. Finally, the related experimental tests of US-DTWLPMVM are carried out to verify the reliability of the theoretical analysis and finite element simulation results. The results show that, the proposed US-DTWLPMVM confers several advantages. These include the improvement of winding ends, an increase in the thrust density of the motor, and a reduction in thrust ripple and balance of the attractive forces of the mover.