Electric Rotating Machine and Stator for the Same

A method of fabricating an electric rotating machine including a rotor having a plurality of N and S poles alternately arranged in a rotating direction, a stator including an annular stator core surrounding the rotor and provided with a plurality of slots, and a multiple-phase stator windings embedded in the slots, and a frame supporting the rotor and the stator, said method comprising;

• forming the stator windings by winding a plurality of continuous wires around a spool;
• press-forming flat straight parts of the stator windings to be embedded in the slots of the stator core;
• winding a stator winding set in the annular shape around a cylindrical member provided with grooves the number of which is equal to that of the slots of the stator core;
• inserting the cylindrical member in a bore defined by the annular stator core;
• adjusting the position of the cylindrical member in the bore of the annular stator core so that the grooves of the cylindrical member are positioned opposite to the slots of the stator core, respectively;
• expanding and inserting the straight parts of the windings wound around the grooves in the slots of the stator core;
• alternately folding back the winding set outside the slots of the stator core to form windings embedded alternately in the direction of the depth of the slots every predetermined number of slots;
• and
• winding leading and trailing ends of the plurality of continuous wires at least one turn around the circumferentially arranged slots of the stator core so that the leading and the trailing ends of the plurality continuous wires are superposed.