Influence of rotor containment sleeve on high-speed PM generator performance based on multi-physics field analysis

Abstract

The rotor containment sleeve brings serious deficiencies in heat dissipations of a high-speed machine with surface-mounted magnets while preventing the centrifugal force generated by the high-speed rotation of the rotor from fracturing the permanent magnet (PM). To address the aforementioned issues, this paper explores the influence of rotor containment sleeves on the comprehensive performance of a high-speed PM generator. In this respect, the electromagnetic losses, temperature distribution and rotor strength considering pole fillers under different material fabricated sleeves are compared and analyzed by electromagnetic field, coupled three-dimensional fluid-thermal field and stress field analysis. The numerical results show that the PM with a copper-embedded composite sleeve has a higher margin factor under a high-speed rotation at a high temperature, while the rotor with a carbon fiber sleeve performs better in view of eddy current losses and temperature rises.

Keywords

high-speed PM generator rotor containment sleeve eddy current loss thermal analysis rotor stress

Get full access to this article

View all access options for this article.

References

Hou

Shen

. Multiphysics research of high-speed permanent magnet synchronous motor considering rotor sleeve and permanent magnet mechanical strength. J Beijing Jiaotong Univ 2019; 43: 110–118.

Liu

Chen

Cui

. Study on comprehensive characteristics of carbon fiber retaining rotor in high speed permanent magnet machine. Small Spec Electr Mach 2017; 45: 1–4.

Zhang

Wang

Gerada

. Rotor eddy current loss and multiphysics fields analysis for a high-speed permanent magnet machine. IEEE Trans Ind Electron 2021; 68: 5100–5111.

Zhang

Wang

, et al. Rotor containment sleeve study of high-speed PM machine based on multi-physics fields. Electr Mach Control 2014; 18: 15–21.

, et al. Multi-field coupling rotor design for surface-mounted high-speed permanent magnet machine. Electr Mach Control 2016; 20: 98–111.

Fang

, et al. Rotor design for high-speed high-power permanent-magnet synchronous machines. IEEE Trans Ind Appl 2017; 53: 3411–3419.

Zhu

, et al. Rotor stress analysis for high-speed permanent magnet machines considering assembly gap and temperature gradient. IEEE Trans Energy Convers 2019; 34: 2276–2285.

Tong

Pan

Gao

, et al. Analysis of mechanical strength and loss of high-speed permanent magnet motor rotor with multi-layer sleeves structure. Electr Mach Control 2022; 26: 21–29.