Patent ID: 6366000
Filing Date: 2002-04-02
Classification: H02K

Abstract:
An alternator comprising:a rotor for forming north-seeking (N) and south-seeking (S) poles about a rotational circumference; a stator comprising: a stator core disposed facing said rotor; and a stator winding installed in said stator core; a bracket supporting said rotor and said stator; and a cooling means for cooling said stator winding by moving together with said rotor and generating a flow of cooling air inside said bracket, whereinsaid stator core comprises a laminated core formed with a number of slots extending axially at a predetermined pitch in a circumferential direction, said stator winding comprises a number of winding sub-portions in each of which a long strand of wire is wound so as to alternately occupy an inner layer and an outer layer in a slot depth direction within said slots at intervals of a predetermined number of slots, said strand of wire folding back outside said slots at first and second axial end surfaces of said stator core to form turn portions, said turn portions align in a circumferential direction to constitute coil ends, an electrically-insulative resin portion is disposed so as to completely cover said coil ends, and at least one surface of said electrically-insulative resin portion selected from a rotor-facing surface and a bracket-facing surface is formed into a smooth surface.