Open AccessRotor strength analysis for high‐speed segmented surface‐mounted permanent magnet synchronous machines
Author(s) -
Chen LiangLiang,
Zhu ChangSheng,
Zhong Zhixian,
Liu Bin,
Wan Anping
Publication year - 2018
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.815
H-Index - 97
eISSN - 1751-8679
pISSN - 1751-8660
DOI - 10.1049/iet-epa.2017.0686
Subject(s) - rotor (electric) , magnet , materials science , finite element method , rotational speed , interference fit , stress (linguistics) , thermal expansion , displacement (psychology) , composite material , mechanics , structural engineering , mechanical engineering , engineering , physics , psychology , linguistics , philosophy , psychotherapist
This study is concerned with the unified analytical solution of rotor strength for the segmented permanent magnet (PM) rotor retained by the carbon‐fibre sleeve and non‐magnetic alloy sleeve in high‐speed surface‐mounted permanent magnet synchronous machine. Considering the influence of different densities and coefficients of thermal expansion of PMs and pole fillers on rotor stress, the analytical solution for rotor strength was proposed based on displacement method and stress potential method in polar coordinate. The proposed analytical solution was validated by the finite‐element method (FEM) and experiment, respectively, and the influences of rotational speed, retaining sleeve thickness and interference fit between the retaining sleeve and PMs on rotor strength were further investigated based on the analytical solution proposed. It is shown that the results calculated by the proposed analytical solution and the FEM are in good agreement with each other, and the analytical solution can accurately predict the stress distributions of the segmented PM rotor retained by the carbon‐fibre sleeve and non‐magnetic alloy sleeve. The difference in density and coefficient of thermal expansion between PM and pole filler, rotational speed and operating temperature have great effects on rotor strength.