3D finite element analysis of the turbogenerator rotor electromagnetic field

A finite element technique and computer code for the finite element analysis of 3D transient electromagnetic fields due to negative sequence currents in large synchronous turbogenerator rotors are developed. It is impossible to carry out accurate numerical simulation of 3D transient electromagnetic processes within whole structure of the rotor because of huge computational expenses. Therefore, this paper is devoted to finite element analysis of electromagnetic processes in important structural parts of the rotor - joints of nonmagnetic slot wedges by the rotor length. Results will be used for computer simulation of thermal and vibration behaviour of the rotor.