Rotary electrical machine

A stator assembly method of a rotary electrical machine for assembling a stator on a case, the stator including a stator holder that has a cylindrical shape and a stator core retained at an inner peripheral surface of the stator holder, the stator holder including a flange portion that extends in a radially outward direction from one axial end of the stator and that includes a plurality of positioning bores arranged at intervals in a circumferential direction of the stator, the stator holder further including a fixing portion fixing the stator to the case, the case including a positioning pin having an outer diameter smaller than a diameter of each of the positioning bores of the flange portion, the positioning pin being engageable with each of the positioning bores, the case further including a fixing seat fixing the fixing portion of the stator holder, each of the positioning bores of the flange portion of the stator holder including at least thee bending portions that extend from a peripheral edge of each of the positioning bores towards a radially inner side, the stator assembly method comprising:

• a bending process bending each of the bending portions at a portion in a length direction from the peripheral edge towards the radially inner side relative to each of the flange portions while conforming to an outer diameter and an arrangement of the positioning pin of the case so as to define an assembly position of the stator;
• an inserting process inserting the stator into the case so that the positioning pin of the case is fitted to each center position that is defined by the bending portions being bent;
• and
• a fixing process fixing the fixing portion of the stator holder to the fixing seat of the case in a state where the positioning pin is fitted to the center position.