Analysis and computation of 3D eddy current in turbogenerator rotor end region at asynchronous operation

In this paper, the mathematical model of the 3D magnetic field in the rotor end region of a large turbogenerator at asynchronous operation is presented. The general process of different boundary conditions and 3D adaptive-mesh generation are used for increasing computation speed and reducing memory. Taking a 300 MW turbogenerator as an example, the rotor end field and eddy current density are calculated. The results can be used for analyzing the performance of the generator.