Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-04-11
2001-11-06
Waks, Joseph (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S179000, C029S596000
Reexamination Certificate
active
06313559
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Application Hei 11-106569 filed on Apr. 14, 1999, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rotary electric machine, and, particularly, an AC generator for a vehicle.
2. Description of the Related Art
An AC generator having a stator winding mounted in a stator core at a high space factor is disclosed in JP-A-62-272836, JP-A 63-274335, U.S. Pat. No. 5097167, and WO98/54823. Because the shape of the slot for accommodating the stator winding is usually rectangular, flat magnet wires can be mounted in the slot at a high space factor.
However, it has become rather difficult to mount such flat wires in the slot at a higher space factor.
SUMMARY OF THE INVENTION
Therefore, a main object of the invention is to provide a high-power rotary electric machine without further increasing the space factor.
Another object of the invention is to provide a high power electric machine which has a high energy-conversion-space volume D
2
L.
Another object is to provide a low-noise and low-cost rotary electric machine.
According to a feature of the invention, a stator core of an AC generator for a vehicles comprised of a slot member having a plurality of slots formed at the outer periphery thereof to open radially outward and a ring member fitted to the slot member to close the plurality of slots. A diameter ratio between an inside diameter Di of the slot member and an outside diameter Do of the ring member, Di/Do, is equal to or larger than 76%. Preferably, each slot has a rectangular space, and each pair of in-slot portions disposed in a slot has a rectangular cross-section corresponding to the rectangular space.
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patent: 09-046940 (1997-03-01), None
Kusase Shin
Shiga Tsutomu
Umeda Atsushi
Denso Corporation
Pillsbury & Winthrop LLP
Waks Joseph
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