Coil rack for a transformer

Details Coil rack for a transformer Coil rack for a transformer

1998-10-07

2001-05-22

Mai, Anh (Department: 2832)

Inductor devices

Coil or coil turn supports or spacers

Coil on a preformed support or mount

C336S192000, C336S198000

Reexamination Certificate

active

06236298

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to an improved coil rack for a transformer, and more particularly to a transformer coil rack that is provided with means for guiding free ends of an inner coil winding of the transformer, so that the free ends of the inner coil winding can be axially pulled downward and then radially pulled outward to reach and be welded to terminals at outer ends of the coil rack. The guiding means prevent the free ends of the inner coil winding from contacting with an outer coil winding wounded around the inner coil winding and therefore prevent any possible short circuit caused by such contact.
A transformer mainly includes a coil rack around which an inner coil winding, a first insulating layer, an outer coil winding, and a second insulating layer are sequentially provided. Free ends of the inner and the outer coil windings are extended outward to be welded to terminals provided on the coil rack. The insulating layers prevent short circuit caused by undesirable contact of the inner coil winding with the outer coil winding.
FIG. 1
illustrates a conventional coil rack
10
that provides a coil winding seat
11
. Radially extended channels
12
are provided on a lower surface of the coil winding seat
11
to end at two outer ends of the coil rack
10
. There are also terminals
13
connected to the outer ends of the coil rack
10
for connecting free ends of inner and outer coil windings
14
,
15
thereto. The terminals
13
are also used to connect the coil rack
10
to an electronic substrate (not shown).
As shown in
FIG. 2
, the inner coil winding
14
is provided around the coil winding seat
11
first. A first insulating layer
16
is then provided around the inner coil winding
14
. Free ends of the inner coil winding
14
are pulled outward to pass through two of the channels
12
and finally welded to the terminals
13
adjacent to the channels
12
. Then, the outer coil winding
15
is provided around the first insulating layer
16
and free ends of the outer coil winding
15
are welded to the other terminals
13
. Finally, a second insulating layer
16
is provided around the outer coil winding
15
to form a transformer as shown in FIG.
3
.
After the inner and the outer coil windings
14
,
15
are sequentially provided around the coil winding seat
11
, their free ends must be pulled outward along the channels
12
for them to be welded to the terminals
13
. Since the channels
12
are radially extended through the lower surface of the coil winding seat
11
, the free ends of the inner coil winding
14
being radially pulled outward along the channels
12
tend to contact with the outer coil winding
15
easily, as illustrated in
FIG. 2
, that will cause not only dangerous short circuit but also high bad yield in the production of transformers.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide an improved coil rack for a transformer. The improved coil rack is provided on a bottom of a coil winding seat thereof with axially extended through holes. These through holes are spacedly located below an inner coil winding provided around the coil winding seat. Stoppers are formed below the coil rack to separately locate radially outside the through holes. Each of the stoppers is provided at a bottom surface with a radially extended open channel of which one end leads to the through hole and another end to an adjacent outer end of the coil rack. Whereby, free ends of the inner coil winding around the coil winding seat can be guided downward via the through holes and then outward via the open channels to reach and be welded to terminals at outer ends of the coil rack without contacting with an outer coil winding outside the inner coil winding. Short circuit caused by contact of the inner coil winding with the outer coil winding can therefore be avoided.


REFERENCES:
patent: 3189772 (1965-06-01), Wingler et al.
patent: 3189857 (1965-06-01), Jones
patent: 3359395 (1967-12-01), Bruce
patent: 4238753 (1980-12-01), Bayer
patent: 4857877 (1989-08-01), Dethienne
patent: 5281942 (1994-01-01), Stokes
patent: 5534839 (1996-07-01), Mackin et al.
patent: 5726616 (1998-03-01), Bell
patent: 5815061 (1998-09-01), Ho

Affiliated with

Also associated with

Rating

Coil rack for a transformer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Coil rack for a transformer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coil rack for a transformer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2553085