NDLI: Analysis of 3D thermal field and deformation in the stator of large hydro-generators

Content Provider	IEEE Xplore Digital Library
Author	Ruoping Yao Fangquan Rao
Copyright Year	2003
Description	Author affiliation: Dept. of Electr. Eng., Shanghai Jiao Tong Univ., China (Ruoping Yao; Fangquan Rao)
Abstract	In order to reduce the vibration of the stator core in the large hydro-generators, the recent tendency is to stack the stator core at site for the hydro-generators with the diameter larger than ten meters. Owing to the temperature difference between the core and frame of the stator, the frame will restrain the expansion of the core, which will lead to buckling of the stator core in case of high-stiffened frame. But in order to prevent from the electromagnetic vibration the stator frame will be required to have an appropriate supporting stiffness for the stator core. The investigation of the thermal deformation in the generator must be based on comprehensive analysis of the temperature distribution within the generator under different operation conditions. In this paper a method by FEM for calculation of the 3D thermal field within the generator is applied. Based on the results of the thermal field calculation, the thermal deformation of the stator core and the frame can be calculated. As an example, the thermal field and deformation of a 400 MW evaporating cooled generator have been calculated. The comparison of the calculated results with those measured at site proves that the applied method in this paper has appropriate precision.
Sponsorship	China Electrotechnical Soc. Chinese Soc. for Electrical Eng. Korean Inst. of Electrical Eng. Nat. Natural Sci. Found. of China
Starting Page	714
Ending Page	716
File Size	228117
Page Count	3
File Format	PDF
ISBN	750626210X
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-11-09
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	International Academic Publishers/World Publishing Corporation
Subject Keyword	Stator cores Cooling Coils Coolants Temperature distribution Thermal expansion Electric machines Conducting materials Hazards Finite element methods
Content Type	Text
Resource Type	Article

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