ABSTRACT
This chapter discusses a 2D moving electromagnetic field–circuit coupling model and a 3D temperature field model of the rotor of a 600 MW hydro-generator. It analyses the influences of the damper winding shifted structure on the damper winding loss and heat. As a kind of structure design scheme for optimizing the no-load voltage waveform of the hydro-generator, the damper winding shifting structure is used in the design and manufacture of the integer slot hydro-generator. To solve the eddy current loss of damper winding, a 2D moving electromagnetic field-circuit coupling model of the hydro-generator is built. In the 2D moving electromagnetic field model, the current density and vector magnetic potential have only the axial z components, and the speed has only the axial x component. The stator and rotor coupling circuit equation of generator and the electromagnetic equation are combined, the magnetic vector is calculated in time-step finite-element method and then the flux density, voltage, and losses can be obtained.
