Patent ID: 6268678
Filing Date: 2001-07-31
Classification: H02K

Abstract:
An alternator comprising:a rotor for forming north-seeking (N) and south-seeking (S) poles along a rotational circumference;a stator having a cylindrical stator core formed with a number of slots extending axially at a predetermined pitch in a circumferential direction and disposed around an outer circumference of said rotor facing said rotor and a stator winding wound onto said stator core;a bracket supporting said rotor and said stator;a rectifier disposed at one end of said rotor; anda cooling means operating together with rotation of said rotor for forming a passage of cooling air within said bracket for cooling said rotor and said rectifier, said stator winding comprising:a number of stator winding sub-portions each of which is constituted by insulated strands of wire wound onto said stator core so as to be housed in different layers relative to a slot depth direction within slots a predetermined number of slots apart, said different layers within said slots said predetermined number of slots apart being joined in series outside said slots to constitute coil ends,wherein each of said coil ends is formed into a connection pattern comprising a pair of root portions extending outwards from said slots said predetermined number of slots apart, a pair of inclined portions bent over and extending circumferentially from said root portions and a connecting portion connecting ends of said pair of inclined portions to each other,wherein coil end groups of said stator winding are constructed by arranging said coil ends formed into said connection pattern neatly into rows circumferentially at both axial ends of said stator core, andwherein said coil ends in at least one of said coil end groups are arranged in rows circumferentially such that said inclined portions of adjacent coil ends are in close proximity to each other without gaps.