Synthesis of 3D Models of a Unipolar Inductor Machine

Abstract

Like-pole reluctance machines with one or more permanent magnets on a rotor, which create net excitation that is closed in the axial–radial direction, are analyzed. Design practices are developed for them that have to be checked via basic methods. One such method is the finite-element technique, or grid method. However, it cannot be applied in the form of a two-dimensional model for the structure under analysis. Hence, a method is presented for constructing three-dimensional models of unipolar inductor machines. The construction is performed by extruding (pressing out) areas of the sector, which outline tooth or pole partition in a plane that is perpendicular to the axis of rotation, coated with projections of boundaries of all axially placed cylindrical sections of the same cutset within each section, forming a 3D model of a stator or a rotor. The method is designed for subsequent mesh generation and for calculation by means of the finite-element method related to magnetic scalar potentials, followed by determination of energy gain and rotating electromagnetic torque, defined by change of a magnetic field energy before and after the rotor is rotated by some basic angle. The described method of creating 3D models is also studied in application to like-pole machines with electromagnetic excitation on the part of a stator. In addition, it is applicable to creating models intended for examining leakage fields in the sphere of the front parts of machines by ordinary geometry reduced to a two-dimensional one.