Distortion of turbo-alternator rotor windings through thermal stress

The theory of copper shortening in turbo-alternator rotor windings is extended to take account of recent research on silver-free and silver-bearing coppers. The interaction of the turns of a slot stack operating within the elastic strength of the material is analysed and the results are applied to determine the stress distribution in a large winding of cold-worked silver-bearing copper under various conditions of practical interest. Deformation rates at given temperatures are estimated for such a winding. The basis of evaluation of the stack interface friction coefficients applied in the estimate is indicated.