Alternator
First Claim
1. 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; and
a 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, and wherein 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.
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Accused Products
Abstract
An alternator has stator winding including a number of stator winding sub-portions each of which is constituted by insulated strands of wire wound onto the stator core so as to be housed in different layers relative to a slot depth direction within slots a predetermined number of slots apart, the different layers within the slots the predetermined number of slots apart being joined in series outside the slots to constitute coil ends; each of the coil ends is formed into a connection pattern comprising a pair of root portions extending outwards from the slots the predetermined number of slots apart, a pair of inclined portions bent over and extending circumferentially from the root portions and a connecting portion connecting ends of the pair of inclined portions to each other; coil end groups of the stator winding are constructed by arranging the coil ends formed into the connection pattern neatly into rows circumferentially at both axial ends of the stator core, and the coil ends in at least one of the coil end groups are arranged in rows circumferentially such that the inclined portions of adjacent coil ends are in close proximity to each other without gaps.
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Citations
17 Claims
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1. An alternator comprising:
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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; and
a 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, and wherein 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
said coil segments are insulated electrical conductors formed into a general U shape, and each of said winding sub-portions is constructed by inserting said coil segments so as to form different layers relative to said slot depth direction within said slots said predetermined number of slots apart, bending free ends of said coil segments extending outwards from said slots said predetermined number of slots apart towards each other in a circumferential direction for connection, and joining said free ends. -
15. The alternator according to claim 14, wherein said coil segments are inserted into said slots from one axial end of said stator core such that U-shaped turn portions are arranged in rows.
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16. The alternator according to claim 1, wherein said strands of wire are continuous wires composed of insulated electrical conductors.
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17. The alternator according to claim 1,
wherein said winding sub-portions comprises first winding sub-portions and second winding sub-portions, each of said first winding sub-portions having one turn and being constructed by winding one strand of insulated wire so as to fold back outside said slots at end surfaces of said stator core and alternately occupy an inner layer and an outer layer in said slot depth direction within said slots at intervals of said predetermined number of slots, and each of said second winding sub-portions having one turn and being constructed by winding one strand of insulated wire so as to fold back outside said slots at end surfaces of said stator core and alternately occupy an inner layer and an outer layer in said slot depth direction within said slots at intervals of said predetermined number of slots and so as to be inverted and offset from said first winding sub-portions by an electrical angle of 180° - ; and
wherein said stator winding is constructed by at least one set of winding assembly constructed by a pair of a first winding group and a second winding group, said first winding group being constructed by arranging said first winding sub-portions, whose number are the same as said predetermined number of slots, at a slot pitch of one, and said second winding group being constructed by arranging said second winding sub-portions, whose number are the same as said predetermined number of slots, at a slot pitch of one.
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Specification