Roebel bar losses estimation for optimization purpose

The paper deals with the Roebel bar additional losses computation. One presents an analytical method for the estimation of the electric current in the elementary conductors, as function of the geometrical dimensions and material data, which provides a high accuracy of i²r losses calculus. The radial field in the slot area and that in the end coil area are taken in to account. The bar composed of both solid and hollow elementary conductors was considered. The computing program based on the proposed method allows the Roebel bar optimization. The paper presents two simulation results and a few parts of the experimental model for the validation of the proposed method.