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Патент USA US3032681

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May 1, 1962
F. 2. DAUGHERTY ETAL
INSULATED WOUND CORE ASSEMBLY F OR ELECTRIC
MOTORS AND THE LIKE
3,032,671
Filed March 17, 1960
FIG. I
I2
,
,
INVENTORS
FRANK Z. DAUGHERTY 8:
B ALB ERT L. SEBOK
UJZMMWQiM
ATTORNEYS
.
United States. Patent 'O?tice
1
2
prised of generally ?at parallelwalls 11a, 11a joined at
3,032,671
one side by a shorter wall 11b, and on the opposite side
terminating in respective similar lips 11c.
‘
INSULATED ‘VOUND CORE ASSEMBLY FOR
.
3,032,671
Patented May 1, 1962
ELECTRIC MOTORS AND THE LIKE
The lips have opposed surfaces mutually converging in-'
Frank Z. Daugherty, Kent, and Albert L. Sebok, Akron,
Ohio, assignors to Ametek, Inc., a corporation of Del
wardly to end at sharp wide shoulders, so that the body
portion may be considered to have a longitudinally slotted
Wall opposite 11b. The width (horizontally as viewed in
FIG. 3) of the lips is selected ?rst for the insulating air
gap desired in the month between coil and stack core, and
also for shear strength of the lips. Thus the insulator
body has the cross-sectional shape of its end~to~end open
ing generally conformed to that of the core portion on
which it is mounted.
aware
Filed Mar. 17, 1960, Ser. No. 15,582
9 Claims. (Cl. 310-214)
The present invention is concerned with an insulated
Wound core assembly, and more particularly with provid
in g a novel improved insulated wound core ‘assembly, and
speci?cally with providing a novel improved insulator for
receiving a coil to be wound about a metal core, and a core
Flat parallel ?ange formations 11)‘, 11)‘ provided at op
adapted to the same.
15 posite ends each extend outward from each wall portion
Although the present invention ‘is ‘here disclosed as em
bodied in an assembly of ‘a small commutating motor ?eld
11a, 11a, 11b and beyond the lips 110, being then per
pendicular to the yoke portion of the core. The extent
of the ?ange projections is determined by the bulk of the
core, winding, brushes ‘and power leads, and described in
corresponding terms, various features of the invention are
useful in other environments.
‘
coil 12 to be wound; and each ‘is carried out even further
20
It is the general object of the present invention to pro
vide an improved way of providing proper insulation of
beyond 11b in a portion providing perforated tabs spaced
from the outside of the coil to mount or anchor coil leads
12a, 12b, leads 16a, 16b of brushes 1‘6 and power leads
17a, 17b.
a conductive coil from a metallic core about which it is
By virtue of three apertures 21, 22, 23, opening through
Another object is to provide adequate insulation of the 25 necked slots to the adjacent edge of the ?ange, and aper~
character described which is incorporated into an assembly
tures 24, 25, the tab portions of the ?anges serve as ter
at low cost.
minal strips to anchor and support the various leads and
A further object is to provide an insulator including
their connected ends. Thus considering the aperture 25
wound.
'
>
means whereby terminal portions of conductive leads are
simply yet effectively anchored.
spaced inwardly from slot or aperture 23, there is de?ned
30 therebetween a short “nec ” of insulator material rigidly
A further object is to provide an assembly of ‘a core,
insulator, coil and other components having leads, where
spaced from the outside of the coil (indicated by the rec
tangular dashed line in FIG. 3) about which neck a con
in the insulator anchors and supports the leads in properly
spaced relation from other components, and in such
ductor 12b may be bent in ‘a bight to anchor a terminal
part of the coil winding and so also another conductor
fashion that the assembly may be handled or processed as 35 (here brush lead 16a) to be connected to the coil. The
part of a larger assembly with all parts maintained in
coil lead or terminal portion 12b is simply threaded out
proper relation.
through 25 and pulled around through the slot into 23
Other objects and advantages will be apparent from the
(and if desired this being repeated for a more secure
following description and the drawings, wherein:
anchor); the end of the brush lead is similarly anchored,
FIG. 1 is an end elevation of a ?eld assembly, embody 40 resulting in the free ends of both leads projecting inw-ard—
ing the present invention;
ly through ?ange aperture 23; the two are electrically
FIG. 2 is a side elevation taken viewed from 2—2 in
FIG. 1 with a portion of the ?eld core or stack broken
away;
FIG. 3 is a fragmentary view corresponding to FIG. 2, 45
joined as by soldering or through a metallic sleeve 19
crimped thereon; and ?nally as needed the lead junction
is bent into a neat placement within the ?ange bounded
space, properly spaced from the coil and other conductors.
with certain portions broken away; and
‘In the speci?cally disclosed structure the central aper
FIG. 4 is a detail of lead supports and connections.
tures 22 are aligned to support at spaced locations the ex—
In the drawings, a stator ?eld core of ferro-magnetic
ternal power leads 17a, 17b, which me thereby held in
material 10 appear-ing in FIG. 1 as having a roughly in
spaced relation from the coil. The end of one lead 17a
verted U-shape, symmetrical about a longitudinal vertical 50 is bent around and brought through on adjacent outer
plane, has a yoke portion 10a embraced by a bobbin in
slot 21 (at left of FIG. 1) for connection to the other
sulator structure 11 on which a ?eld coil 12 is wound, the
' coil lead 12a previously anchored in the manner described
core having leg portions 10b suitably shaped to define two
for 12b. Similarly the end of 17b is connected to the end
poles with opposed faces adapted to embrace an intended
of brush lead 16b ‘anchored as described.
cooperating rotor. Although the general form of the core 55
Thus a neat secure anchoring of the various conductor
here shown is such as might be used in a commutating tWo~
pole motor, it is not necessarily of such type.
The core may be fabricated with the herein noted neces
ends is achieved in a simple fashion keeping the same
properly spaced and insulated; and the ends of the power
lead particularly are supported so that strain is not taken
sary characteristics in any suitable manner, being‘ here
only at the point where they are jointly anchored and con
shown as comprised of a stack of likepunched sheet iron 60 nected to other conductors.
metal laminations held together in alignment by rivets at
The described insulator advantageously is molded in the
' 100 or Welding beads at 10d. In any avent, the core
described form including the slots and apertures 21, 22,
portion received within the bobbin 11, that is the yoke
23, 24, 25 as an integral piece of nylon or other suitable
portion 10a has an elongated and rectangular cross-section
plastic which though generally rigid is at least resilient
(see FIG. 3) and hence may be said to have a straight
enough to permit spreading apart of the lips 11c as the un
portion, i.e.,' with ?atparallel top and bottom surfaces,
wound insulator is slipped sideways onto the core. The
extending through the hollow bobbin.
- The coil insulator or bobbin 11 as viewed in FIG. 3 is
lips then return inward to engage longitudinal marginal
, edges of the narrow core side face which is then centered
symmetrical about a horizontal central plane and has a
relative to the longitudinal slot de?ned between lips 11c—
rectangular spool-like form, ie, in having a body on 70 thereby retaining the insulator on the core. The piece as
which a coil is wound, and a generally peripheral coil
retaining ?ange at each end. The body portion is com
molded may have a slight convergency of the walls 11a
toward the open side, thereby to effect a tighter grippingof
3,082,671
3
4.
the unwound-insulator on the core. The winding of the
of said core portion, said body being longitudinally open
.
core of course further secures the insulator relative to the
along one narrow side, whereby the said insulator may be
core by increasing frictional engagement.
slipped sideways onto said core portion; the body having
We claim:
a pair of respective longitudinal lips formed on opposite
1. In an electrical component including a metal core Cl sides of the longitudinal opening engaging respective
margins on said face of the core for retaining the body
and‘ a conductive coil about the core, the combination
comprising: a core portion having an elongated cross
on the core; said lips having respective surfaces inwardly
section providing a relatively narrow lengthwise face along
oneside of said portion; and a one-piece insulator of
resiliently rigid material about said core portion, said in
convergent toward said opening; and an integral periph
eral ?ange on each end of the ‘body extending outwardly
perpendicularly to the core, each ?ange having a gap
sulator having-a central opening therethrough adapted to
extending outwardly beyond said lips.
receive and generally conformed to said core portion,
said insulator having a longitudinal slot along one side
6. In the combination of claim 5, said ?anges each in
cluding at the side of the body a ?ange portion projecting
beyond the thickness of the coil; each '?ange portion hav
corresponding to said narrow ‘face on the core, whereby
the insulator may be slipped onto the core from a side 15 ing a necked slot extending inward from one edge and an
opposite said narrow face, said slot being narrower than
aperture closely spaced to and inward of the slot end to
said face to provide insulator retaining lips on opposite
sides of‘the slot for engaging opposite longitudinal mar
portion of a coil conductor; the ?ange portions having
ginal areas of said face, said side being thickened relative
to the general thickness of the insulator thereby to increase
aligned respective second inward necked slots adapted to
receivevand support at longitudinally spaced locations a
provide therebetween an anchor for a bight in a terminal
the spacing of the coil from the core over the slot region;
lead to be connected to one of said conductor terminal
and opposed surfaces of said lips ‘being, outwardly
portions.
divergent.
7. For insulating a coil from a core therefor including
a core portionhaving an elongated rectangular transverse
'2. In the combination of claim 1, said insulator includ
ing atfeach end an integral ?ange formation extending 25 cross-section providing a relatively narrow longitudinal
substantially perpendicularly out from said'core in all
face onone side: a resilient one-piece insulator having a
directions except at said slot torsupport opposite ends of
body centrally open from end to endv and generally con
formed to the rectangular cross~section of said core por
. the coil.
tion, said body portion being longitudinally open along one
3. In the, combination of claim 2, each of said' ?anges
having’ a ?ange portion extending beyond said, coil, said
?ange portions being parallel and each having a pair of
apertures successively inwardly spaced ‘from a ?ange
edge and the edge slit inward to the outer of said apertures
to provide between said apertures an anchor region ‘for a
bight in a terminal portion of the coilrconductor, said
30
narrow side, whereby the said'insulator may be slipped
sideways onto said core portion; the body. having a pair
of respective longitudinal lips formed on opposite sides
of the longitudinal opening engaging respective margins
on said face of the core for retaining the body on the
' core; said lips having respective surfaces inwardly con
?ange portions having each an .additionalaperture, the
vergent toward said opening; and an integral peripheral
additional apertures being aligned for support of a lead
wire received therein in spaced relation to the coil and
?ange on each end of the ‘body extending outwardly per
pendicularly to the core, each ?ange having a gap extend
ing outwardly beyond said lips; said ?anges each including
joinedto a conductor anchored on one of said ?ange
portions.
40
4. For insulating a coil from a core therefor having an
at the side of the body a ?ange portion projecting beyond
the thickness of the coil to be wound; each ?ange portion
having a necked slot extending inward from one edge and
an aperture closely spaced to and inward‘of the slot end
elongated cross-section providing a relatively narrow
lengthwise face along one side of said portion: a resilient
one-piece hollow insulator for said core portion having a
to provide therebetween an anchor ‘for a ‘bight in a ter
central opening therethrough adapted to receive and gen 45 ‘minal portion of a coil conductor.
erally conformed to said core portion, said insulator hav
8. In a fractional horsepower motor, a stator core hav
ing a longitudinal slot along one side corresponding to said
ing a core portion with substantially uniform elongated
narrow face on the core, said slot being narrower than
rectangular transverse cross-section; a one-piece insulator
and centered relative to said face, integral longitudinal
molded of elasticallvrigid material in a generallyv rec
lips formed on respective sides of said slot for engaging 50 tangular spool-like form to have a. rectangular central
margins of said face and having opposed outwardly di
opening complementary in shape to the said core portion,
vergent lip surfaces, whereby the insulator may he slipped
said insulator having at one narrower side a longitudinal
onto the core from a side opposite said narrow face and
opening into the central opening whereby the insulator
thereretained by said lips, said insulator having an in
may be slipped sideways onto said portion of the stator
tegral coil-retaining peripheral ?ange at each end ex 55 core, said insulator including insulator locking lips formed
tending substantially‘ perpendicularly outward thereof and
on opposite sides of said opening for engagement with a
interrupted to provide access to said slot, both said ?anges
narrower longitudinal face of the core; and a stator wind
having parallelly-extending ?ange portions projecting be
ing Wound on said insulator about said core; the end
yond the thickness of the coil to be wound thereon; each
said ?ange portion having a pair of apertures successively
inwardly spaced from a ?ange edge and the edge slit in
Ward to the outer of said apertures to provide between the
apertures an anchor region for abight in a terminal por
tion of a coil conductor; the said ?ange portions having
aligned respective additional apertures for receiving there
in and supporting in spaced relation to said coil a lead
a wire joined to a conductor anchored on one of said ?ange
60
?anges of the insulator having portions projecting out~
wardly beyond the winding and plurally perforated to
provide anchor regions for bights in terminal portions of
the. winding.
'
i
9. In a fractional horsepower commutating motor, as,’
a subassembly: brusheshavingattached?exible leads, a‘
?eld core having a core' portion with substantially uni“
form elongated rectangular transverse cross-section; a one
piece insulator molded of elastically rigid material in a "
.
generally rectangular spool-like form to have a rectangular
5. In ‘ an electrical component including a metal core
and a conductor'coil wound about the core, the combina 70 central opening complementary in shape to the said'core‘
portion, said insulator having at one narrower side a
tion comprising: a core portion having an' elongated rec
portions.
tangular transverse cross-section providing a' relatively
longitudinal opening into the central opening whereby
narrow longitudinal face on one side; a resilient one-piece
'the insulator may be slipped sideways onto 'said portion
insulator having a body centrally open from end to end
of the ?eld core, said insulator including insulator lock- ,
and, generally conformed to the rectangular cross-section 75 inglips. formed on opposite ‘sides of said opening for
3,032,671
5
6
engagement with a narrower longitudinal face of the
core; and a ?eld Winding wound on said core; the end
?anges of the insulator having portions projecting out-
having permanent connections adapted for commutating
motor operation spaced from each other and said coil.
References Cited in the ?le of this patent
wardly beyond the winding and plurally perforated to
UNITED STATES PATENTS
provide anchor regions for bights in terminal portions of 5
the Winding and in the brush leads and further to provide
aligned respective apertures for supporting external leads
2,559,803
2,5923 55
2,858,514
leaving said assembly, said leads and terminal portions
2,902,661
Schneider ____________ __ July 10
Sickles et a1_ _________ __ Oct 19’,
Henderson __________ __ (Jet, 28,
Henderson ___________ __ Sept. 1,
1951
1954
1958
1959
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