Structural Optimization of a Permanent-Magnet Direct-Drive Generator Considering Eccentric Electromagnetic Force

Author

Jimin Ma ; Ronghai Qu ; Jian Li ; Shaofeng Jia

Author_Institution

Sch. of Electr. & Electron. Eng., Huazhong Univ. of Sci. & Technol., Wuhan, China

Volume

51

Issue

3

fYear

2015

fDate

Mar-15

Firstpage

1

Lastpage

4

Abstract

Permanent-magnet direct-drive generators (PMDDGs) running at low speed need large electromagnetic force to generate the necessary torque. This type of electromagnetic force is one of the sources for rotor mechanical stress. In actual operation, mechanical stress will be worsened by the rotor imbalance. In this paper, a joint optimization of electromagnetic and stress field analysis is developed for a PMDDG. The mechanical stress and deformation caused by rotor weight, eccentricity, and terminal fault conditions are optimized in transient structural analyses. The proposed method and model are employed to study electromagnetic forces acting on the rotor core of a 7 MW wind turbine generator.

Keywords

deformation; electric drives; electromagnetic fields; electromagnetic forces; fault diagnosis; optimisation; permanent magnet generators; rotors; wind turbines; PMDDG; deformation; eccentric electromagnetic force; electromagnetic field analysis; joint optimization; permanent magnet direct drive generator; power 7 MW; rotor imbalance; rotor mechanical stress; rotor weight; stress field analysis; structural optimization; terminal fault conditions optimization; transient structural analyses; wind turbine generator; Bridges; Electromagnetic forces; Optimization; Rotors; Stress; Transient analysis; Eccentricity; electromagnetic force; joint optimization; mechanical stress;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2014.2361871

Filename

7093553