Rotary electric machine having reinforcing ring on armature

Details Rotary electric machine having reinforcing ring on armature Rotary electric machine having reinforcing ring on armature

2001-11-15

2003-05-20

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S271000

Reexamination Certificate

active

06566780

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
This application relates to and incorporates herein by reference Japanese Patent Application No. 2000-392318 filed on Dec. 25, 2000.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rotary electric machine having a reinforcing ring on an armature.
2. Description of Related Art
It is proposed to fit a reinforcing ring on the outer periphery of an armature coil end, which protrudes from an end surface of an armature core in an axial direction, to protect the armature coil from centrifugal force. For example, in an armature
100
shown in
FIG. 5
, a reinforcing ring
130
is fitted on an armature coil
110
axially outside of a slot insulation paper
140
without over lapping the slot insulation paper
140
. When the reinforcing ring
130
is fitted on the slot insulation paper
140
that protrudes from the side surface of the armature core
120
in the axial direction, the coil end is likely to expand in a radially outside direction due to centrifugal force by compressing the slot insulation paper
140
. Therefore, it is necessary to provide a straight portion within the coil end for fitting the reinforcing ring
130
axially outside of the slot insulation paper
140
without overlapping. As a result, the axial length of the armature
100
is increased.
However, in order to downsize the rotary electric machine, it is needed to shorten the axial length of the coil end as much as possible because the coil end does not contribute to performance. Thus, mounting method of the reinforcing ring
130
must be improved to meet this requirement.
SUMMARY OF THE INVENTION
The present invention is made in view of the above problem and it is an object to provide a rotary electric machine which has a reinforcing ring on an armature and suitable for downsizing.
In an armature of the present invention, a slot insulation paper provided underneath an armature coil has a shorter axial length at an outer peripheral side of a coil end of the armature coil than at an inner peripheral side of the coil end to provide an exposed surface of the coil end at the outer peripheral side. A reinforcing ring is fitted on the exposed surface.
As compared with other armatures in which the reinforcing ring is mounted axially outside of the slot insulation paper that protrudes from the axial side surface of an armature core in the axial direction, a mounting position of the reinforcing ring is made closer to the armature core side so that the straight portion of the coil end is shortened. As a result, an axial length of the armature is shortened.
Further, a resin insulator is filled in a clearance between the exposed coil end and the reinforcing ring. Thus, it is unnecessary to accurately manage the inner diameter of the reinforcing ring.
In addition, the reinforcing ring is press-fitted in direct contact with the exposed surface of the coil end. Accordingly, the armature coil can be strengthened against the centrifugal force.


REFERENCES:
patent: 3047756 (1962-07-01), Coggelshall
patent: 3179828 (1965-04-01), Apking et al.
patent: 4400639 (1983-08-01), Kobayashi et al.
patent: 4786835 (1988-11-01), Bode et al.
patent: 5473213 (1995-12-01), Kahle, Sr.
patent: 6064136 (2000-05-01), Kobayashi et al.
patent: 54007501 (1979-01-01), None
patent: 58-90047 (1983-06-01), None

Affiliated with

Also associated with

Rating

Rotary electric machine having reinforcing ring on armature does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Rotary electric machine having reinforcing ring on armature, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotary electric machine having reinforcing ring on armature will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3063259