Translated Abstract
In recent years,the single-machine capacity of the generator increases, the magnetic-leakage makes the eddy current losses and temperature on the end of the stator increasing.The thermal problem is the important reason that endangers the normal operation of generators. The material characteristics of the generator is variable, the structures and distributions of the eddy current are complex. People pay attention to the magnetic field in the end of stator.So many problems need be solved yet up to now. The distributing of the eddy current field in the end has important influence to the safe operation and efficiency of the generator.This paper will introduce the background of the development of 660MW generator. It shows the research status of the eddy current field in the end region, also studies the theoretic base of using the finite element method to analyze the eddy current magnetic field in the end region of stator, to analyze the magnetic field in the end region, it has already achieved part results to the magnetic field of the end element and the eddy current losses.Considering the complexity of the end region, this paper chooses finite element method and uses the Magnet software to found simulation model in the end region, and analyzes the model, considers the various end element and geometry figure, space position and material characteristic to the magnetic field in the end region exactly. According to the calculating and processing later, acquire the axial flux density distribution and copper screening flux density distribution. It calculates the end stator iron losses and copper screening current losses caused by axial flux density and also the temperature of the stator end and copper screening. Finally it compares the calculating result and the measure data of the test.This paper has considerable theoretic value. It provides demonstrate to the design of the generator and improvement of the stator’s structure and also is a basis to calculate the eddy current losses of the element at the end. It is guided to the actual appliance of the project.
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