Calculation of the external magnetic field of the phase windings of electric machines of alternating current in the absence of ferromagnetic cores.

Abstract

The expressions for calculating the external magnetic field (VMP) of the phase windings of AC electric machines in a spherical coordinate system are derived. It is shown that the high-frequency magnetic field of a 2p-pole m-phase winding is mainly determined by a magnetic multipole, which varies with distance in proportion to 1 / R0 ^ (p + 1), and near the winding - by a multipole, which changes according to the law 1 / R0 ^ (p + 3). The maximum value of the VMP reaches in a plane passing through the center of the winding; along the longitudinal axis of the winding, the field value is zero. Bibliography: 3 titles.