The current distribution on the elementary conductors of the Roebel bar

The paper deals with the Roebel bar losses computation. It was considered the most general Roebel bar structure, including both solid and hollow elementary conductors. One proposes an analytical method for the estimation of the currents in the elementary conductors, as function on the geometrical dimensions and material data. It is possible to emphasize also the current density distribution on the cross section of each elementary conductor. The radial field in the slot area and that in the end coil area were taken in to account. One can analyze the influence of any quantities (machine and material data) on the Roebel bar losses. Therefore, the proposed method is very useful to optimize the bar structure, for the machine efficiency improvement.