US 6,291,918 B1Granted

Alternator for vehicle

AssigneeDenso Corporation

InventorsAtsushi Umeda, Tsutomu Shiga, Shin Kusase

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Abstract

It is an object of this invention to provide a compact high-power alternator for a vehicle. It is another object of this invention to provide a low-noise alternator for a vehicle which outputs an increased power during operation at a low rotational speed. An alternator 1 for a vehicle includes a stator 2 having inner circumferential surfaces formed with many slots having open ends 35. Teeth ends of the stator between the slots have magnetic-flux collecting projections 36 extending in circumferential directions. The magnetic-flux collecting projections 36 are previously formed by, for example, a pressing process during a stage in which they are thin steel plates. An electric conductor forming a winding 33 has a diameter greater than a width of inner openings of the slots. A piece of the electric conductor extends into a first slot from a first side of the iron core 32, and extends out of the first slot to a second side of the iron core 32 before extending into a second slot, which is distant from the first slot by an electric angle of 180°, from the second side of the iron core 32 and extending out of the second slot to the first side of the iron core 32. The winding 33 has a recurrence of such pieces which forms one phase. The winding 33 has, for example, three phases separated by electric angles of 120°.

Claims14

Dependent claims

An alternator for a vehicle, comprising:

a hollow, cylindrical stator having a longitudinally extending central cavity;
a rotor disposed within said cavity such that the stator opposes the rotor;
and
a frame supporting said rotor and said stator;
wherein said stator comprises an iron core and a plurality of electric conductors, said iron core having a plurality of slots, said electric conductors being partially placed in said slots, said slots having first, axially extending openings which establish communication between said slots and said cavity, said first openings having a width smaller than a width between inner walls defining said slots, the width of said first openings of said slots being smaller than a minimal width of said electric conductors;
wherein the stator has two end surfaces, in an axial direction of said iron core, which are formed such that one of the two end surfaces has openings constituting second slot openings through which said electric conductors are inserted into said slots, end portions of said electric conductors being bent in circumferential directions at positions immediately outward of said second openings;
and
wherein said first openings are formed in inner sides of said slots and are narrower than a width of electric conductor-accommodating portions of said slots, wherein each of said slots accommodates a plurality of electric conductors which are in mechanical contact with each other.

5 more elements

Dependencies are inferred from the claim text.