Patent ID: 8141232
Filing Date: 2012-03-27
Classification: H02K,Y10T

Abstract:
1. A method of manufacturing a stator for a dynamoelectric machine, the method comprising the following steps: preparing a plurality of electric wires and a stator core, wherein the stator core has a hollow cylindrical shape and includes a plurality of slots formed in a radially inner surface thereof; shaping the electric wires to obtain a plurality of shaped electric wires, wherein each of the shaped electric wires includes a plurality of straight portions, which are parallel to each other, and a plurality of connecting portions each of which connects an adjacent pair of the straight portions; assembling the shaped electric wires to form a flat electric wire assembly, wherein the flat electric wire assembly includes a plurality of straight overlapped portions each of which is formed by overlapping a predetermined number of the straight portions of the shaped electric wires; rolling the flat electric wire assembly by a predetermined number of turns to form a hollow cylindrical electric wire assembly, wherein the hollow cylindrical electric wire assembly has an outer diameter smaller than an inner diameter of the stator core and includes a plurality of straight stacked portions each of which is formed by radially stacking a predetermined number of the straight overlapped portions of the flat electric wire assembly; and mounting the hollow cylindrical electric wire assembly to the stator core to form the stator which includes the stator core and a multi-phase stator coil made up of the hollow cylindrical electric wire assembly, wherein the mounting step includes placing the hollow cylindrical electric wire assembly radially inside of the stator core so that each of the straight stacked portions of the hollow cylindrical electric wire assembly is radially aligned with a corresponding one of the slots of the stator core, and radially expanding the hollow cylindrical electric wire assembly to insert the straight stacked portions of the hollow cylindrical electric wire assembly into the corresponding slots of the stator core.