Mechanism of magnetic losses variation in stator-end structures with windings extensions using space vectors

Electromagnetic and heat issues are more complex in the end region of a generator than in the line segment area. In this study, the electromagnetic field and related challenges are discussed. Stepped cores are considered in the performed calculations. Eddy-current losses variation mechanisms for structures in the end region and iron losses of end stepped cores are investigated under rated load condition, using space vectors. The effects of the end windings stretching out the end cores from the rotor and stator on the electromagnetic losses of the end structures studied in detail. The obtained results can be employed for developing large turbo-generators, and reveal a novel approach for reducing eddy currents and iron losses.