Unbalanced magnetic force prediction in permanent magnet machines with rotor eccentricity by improved superposition method

作者：Li, Yanxin; Lu, Qinfen^*; Zhu, Zi-Qiang

来源：IET Electric Power Applications, 2017, 11(6): 1095-1104.

DOI：10.1049/iet-epa.2016.0739

• permanent magnet machines
• machine insulation
• rotors
• electromagnetic fields
• finite element analysis
• unbalanced magnetic force prediction
• permanent magnet machines
• rotor eccentricity
• improved superposition method
• armature field
• UMF
• PM machines
• dynamic eccentricity
• static eccentricity
• eccentric machine
• concentric machine models
• air-gap sections
• electromagnetic field
• force density
• direct finite-element analysis

An improved superposition method accounting for both permanent magnet (PM) and armature field is proposed to predict the unbalanced magnetic force (UMF) of PM machines having static/dynamic eccentricity. It virtually divides the original eccentric machine into a number of sections along the circumferential direction. Then, a series of concentric machine models are established with equivalent air-gap lengths corresponding to those air-gap sections. From the electromagnetic field of each concentric machine predicted by subdomain method, the air-gap field of the original eccentric machine can be synthesised. Finally, the UMF can be easily obtained by the integral of force density along the air-gap circumference. The effectiveness of the proposed method is validated on both rotating asymmetric and symmetrical PM machines by direct finite-element analysis and experiment, with particular emphasis of rotor eccentricity influence on the UMF of later one.

• 出版日期2017-7
• 单位浙江大学