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Erschienen in:
2021 | OriginalPaper | Buchkapitel
Modeling of Radial and Tangential Roebel Bar Force Distributions in Large Electrical Machines Considering Longitudinal Transposition
verfasst von : Amir Ebrahimi, Marius Meiswinkel
Erschienen in: Energy Efficiency in Motor Systems
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Abstract
The radial and tangential force components acting on each sub-conductor of a Roebel bar in a large generator lead to mechanical vibration of conductors. This double-frequency vibration results in insulation deterioration and looseness of stator bars. Understanding the origin of these vibrations and developing models to anticipate them is essential to increase the reliability and expected lifetime of these systems. This chapter presents a comprehensive study on the origin and behaviors of Roebel bar vibrations under different operation modes. A 3D-FEM model of a generator is developed and the vector potential values in the air gap are calculated. These vector potential values are applied as boundary condition to a detailed 2D-FEM model to calculate the sub-conductor forces. The results obtained from Maxwell stress tensor and Lorentz force methods are compared to each other. Moreover, the Roebel bar force behavior for different power factors and load angles is investigated.