Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-11-18
2001-06-26
Tamai, Karl (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S198000, C310S201000
Reexamination Certificate
active
06252326
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Application Hei 10-335640 filed on Nov. 26, 1998, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an AC generator for a vehicle and, particularly, a stator winding arrangement thereof.
2. Description of the Related Art
WO92/06527 discloses an ac generator's stator having U-shaped conductor segments inserted into respective stator's slots from an end of a stator core so that turn portions can be disposed circumferentially at one end of the stator. As the number of the conductor segments disposed in each slot increases, the number of the turn portions increases. In the stator having four conductor members in each slot, two conductor members are disposed at the front of the slot and two conductor members are disposed at the rear of the slot. Two conductor members extending from one slot in the same circumferential direction have respective turn portions aligned circumferentially. Therefore, as the number of the aligned turn portions increases the distance therebetween decreases, thereby making cooling effect of the stator winding worse. In other words, as the distance between the aligned turn portions decreases, cooling air supplied by an inside cooling fan can not smoothly flow from radially outward between the turn portions.
SUMMARY OF THE INVENTION
A main object of the invention is to provide an improved stator having conductor segments that can be cooled effectively.
According to an aspect of the invention, a stator of a vehicle AC generator includes a stator core having a plurality of slots and a stator winding including a plurality of circumferentially aligned U-shaped conductor segments.
The conductor segments are grouped into two: first segments having first turn portions, and second segments having second turn portions which are enclosed by the first turn portions. The first turn portions and second turn portions are shifted from one another in the circumferential direction.
In the stator, each of the first segments has two inclined portions having the same length which respectively extend from two slots and join together at the first turn portion, and each of the second segments has two inclined portions having different lengths which respectively extend from two slots and join together at the second turn portion.
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patent: 2757298 (1956-07-01), Botts et al.
patent: 4602180 (1986-07-01), Olson
patent: 4827172 (1989-05-01), Kobayashi
patent: 5191250 (1993-03-01), Kobayashi
patent: 92/06527 (1992-04-01), None
patent: 98/54823 (1998-12-01), None
Kusase Shin
Shiga Tsutomu
Umeda Atsushi
Denso Corporation
Pillsbury & Winthrop LLP
Tamai Karl
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