Title :
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
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;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2014.2361871