ANALYSIS OF THE VARIABLE COMPONENT OF MAGNETIC FIELD ON THE ROTATING ROTOR SURFACE OF A TURBOGENERATOR.

The most deterministic method for calculating the variable component of the magnetic induction on the surface of the rotating rotor of a powerful turbogenerator is presented . It is based on multiposition numerical field calculations of the magnetic field under the rotor rotation and the stator winding currents change taking into account the real geometry of the electromagnetic system and the core saturation. The harmonic analysis of the separated variable component of the magnetic induction is performed at a number of points on the rotor surface in no-load and rated load modes. The conclusion is made that the classical solution of an analogous problem fails to give adequate results because of too rough assumptions. The method introduced is universal for any electric machines, modes of excitation, and geometrical structures of their design