Применение метода конечных элементов для расчета активного сопротивления обмоток электрических машин

Abstract

Good prospects expected from using innovative AC electrical machines equipped with a compact stator winding are substantiated. A procedure for calculating the resistances of machine winding phases with a variable rectangular cross-section of the stator winding conductors is proposed. A piecewise plane-parallel approximation of the field of turns with a decreased cross-section area of partitions between their active and end-face conductors is applied. The calculation procedure is based on the Laplace equations for electrostatic fields and the finite element method, both implemented in the ELCUT environment. The results from modeling the current density distribution in the turn parts with a variable cross section are given. Application of the procedure for stage-wise determination of the innovative electrical machine’s phase winding resistance is illustrated. The winding is made of a rectangular conductor with the cross section cyclically varying over the conductor length. The necessity of taking into account the influence of nonuniform current spreading in the turns with a variable cross-section in carrying out design calculations of electrical machines with the cores having different length to diameter ratios is considered. An example of estimating the errors in calculating the proposed winding’s phase resistances is given.