US 6,501,205 B1Granted

Alternator

AssigneeMitsubishi Denki Kabushiki Kaisha

InventorsYoshihito Asao, Katsumi Adachi, Akira Morishita

Life of this patent

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Abstract

An alternator includes a rotor for forming north-seeking (N) and south-seeking (S) poles about a rotational circumference, a stator having a stator core disposed facing the rotor and a polyphase stator winding installed in the stator core, and a bracket supporting the rotor and the stator, wherein the stator core includes a laminated iron core formed with a number of slots extending axially at a predetermined pitch in a circumferential direction, the polyphase stator winding includes a number of winding sub-portions in each 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 the slots at intervals of a predetermined number of slots, the strand of wire folding back outside the slots at axial end surfaces of the stator core to form turn portions, and the turn portions align in a circumferential direction to constitute coil end groups.

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 polyphase stator winding installed in said stator core;
and
a bracket supporting said rotor and said stator,
wherein said stator core comprises a laminated iron core formed with a number of slots extending axially at a predetermined pitch in a circumferential direction,
said polyphase stator winding comprises a number of winding sub-portions in each 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 axial end surfaces of said stator core to form turn portions, and
said turn portions align in a circumferential direction to constitute coil end groups at both axial end portions of said stator core,
wherein said number of winding sub-portions are constructed with at least one winding assembly formed by simultaneously bending and folding a plurality of said strand of wires,
wherein said winding assembly is constructed by arranging at one slot pitch offset the same number of wire-strand pairs as said predetermined number of slots, each of said wire-strand pairs constructed by arranging two strands of said strands of wire so that straight portions alternately overlap at a predetermined pitch, each of said strands of wire being formed into a pattern in which said straight portions are connected by turn portions so as to be arranged at a pitch of said predetermined number of slots and adjacent straight portions are offset by said turn portions so as to alternately occupy said inner layer and said outer layer in said slot depth direction, and by extending each end portion of said strands of wire on both sides of both ends of said winding assembly and arranging the same number of pairs of said overlapping straight portions as the number of said slots at said one slot pitch.

9 more elements

Facts

Application

09/660,472Filed 12 Sep 2000

Priority

JP 11-35519414 Dec 1999

Granted

31 Dec 2002

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

H02K 9/06
Having means for generating a flow of cooling medium: with fans or impellers driven by the machine shaft
H02K 3/12
Windings characterised by the conductor shape, form or construction, e.g. with bar conductors: arranged in slots
H02K 3/28
Windings characterised by the conductor shape, form or construction, e.g. with bar conductors: layout of windings or of connections between windings
H02K 3/345
Between conductors or between conductor and core, e.g. slot insulation: between conductor and core, e.g. slot insulation

Abstract

Claims27