Method of manufacturing a stator in a rotating electric machine

A method of manufacturing a stator in a rotating electric machine, the method comprising:

• a preparing step for preparing a stator core having plural slots in an inner peripheral surface, each slot of the plural slots has a slot peripheral wall and slot opening that opens in the inner peripheral surface, the slot peripheral wall of each slot has a slot bottom wall and a pair of slot side walls opposing to each other and continuing to the slot bottom wall;
• a spraying step for spraying a powder of an electrical insulation material on the slot peripheral wall of each slot to form an insulation coating;
• a cutting step for cuffing into the insulation coating on the pair of slot side walls at vicinity of the slot opening to form a pair of holding grooves opposing each other, each of the pair of holding grooves has a groove bottom wall and a pair of groove side walls opposing to each other;
• a disposing step for disposing a stator winding having plural winding member such that each winding member of the stator winding is inserted inside each slot;
• and
• an inserting step for inserting an electrical insulation member between the holding grooves for closing the slot opening,
• wherein in the spraying step, the insulation coating is formed over continuously from the slot bottom wall to the pair of slot side walls,
• and wherein in the cutting step, the holding grooves are formed in the insulation coating on the slot side walls so that a depth of each of the holding grooves is smaller than a thickness of the insulation coating, and the groove bottom wall and the pair of the groove side walls are formed in the insulation coating on the slot side walls.