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Патент USA US2295203

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Sept. 8, 1942.
v. L. DARNELL
2,295,203
FIELD RING
Filed Jan. 26, 1940
2 Sheets-Sheet l
Sept, 8, 1942.
v. L. DARNELL
2,295,203
FIELDD RING
Filed Jan. 26, 1940
2 Sheets-Sheet 2
2,295,203
Patented Sept. 8, 1942
vUNITED STATES PATENT OFFICE
2,295,203
FIELD RING
Victor L. Darnell, Dayton, Ohio, assignor to The
Master Electric Company, Dayton, Ohio, a cor
poration of Ohio
Application January 26, 1940, Serial No. 315,812
6 Claims. (Cl. 171-252)
views illustrating various forms of embodiment
This invention pertains to electric motors,
of the invention. Fig. 5a is a perspective view
generators and the like, and more particularly
of a fragmentary part of the form of the inven
to an improved ?eld and brush ring assembly
tion shown in Fig. 5.
thereof.
Like parts are indicated by similar characters
Heretofore it has been customary to construct 5
of reference throughout the several views.
motor housings of cast metal in three sections,
In the drawings there is illustrated an electric
comprising the opposite heads or end bells and
motor, of which l-—l are the heads or end bells,
an intermediate annular section which must be
which are rabbeted to receive the intermediate
bored to size to receive the stator or ?eld ring
and brush ring and otherwise ?nished to ?t the 10 ?eld mounting section 2. Ordinarily the ?eld
ring laminations are enclosed in an annular cast
heads or end bells. Such operations not only add
metal housing section which is relatively heavy
to the cost of manufacture, but also materially
and which requires sundry expensive machining
increase the weight of the ?nished motor.
rI‘he present construction and mode of manu
operations to adapt it for use.
In lieu of such heavy cast metal casing, the
facture and assembly is designed to obviate the 15
assembly of stator laminations 3, in the present
necessity for such heavy cast metal housing and
instance, are surrounded by a welded band 4
minimize expensive machining operations, by
of relatively thin plate or sheet metal, which is
formingr a welded plate metal or sheet metal ring
not only of less weight, but of greater tensile
Within which the ?eld laminations have a tight
press or shrink ?t, and by distorting limited 20 strength than the customary cast metal housing
section, and will withstand hard usage with less
areas thereof by relatively cheap punching or
likelihood of breakage. The band 4 is rolled and
spinning operations or by welding stops therein
welded closely to size, whereby the laminae will
to afford suitable abutments for brush ring loca
be secured therein with tight press or shrink ?t,
tion.
The object of the invention is to improve the 25 without preliminary machining.
It is customary to assemble in the same motor
construction as well as the means and mode of
section a mounting ring 5 for commutator
assembly of dynamo electric machines, whereby
brushes, which is ordinarily abutted against a
they will not only be efficient in use but may be
shoulder or within a rabbet machined within the
more economically manufactured, of less weight,
sturdy construction, and unlikely to get out of 30 conventional cast metal housing ring. In the
present instance such locating or limiting means
repair.
may be variously formed within the welded band
A further object of the invention is to provide
4. In Figs. 1 and 3 the band 4 is exteriorly in
an improved ?eld ring or stator assembly.
dented at circumferentially spaced intervals,
A further object of the invention is to provide
an improved method of ?eld ring assembly and 35 thereby forming interiorly of the ring small pro
tuberances 6-45 against which the brush mount
an improved method of providing stop abutments
ing ring 5 may abut. If so desired, a second
within the assembly.
similar series of protuberances 6a may be pro
A further object of the invention is to provide
vided, as limiting stops against which the
a motor assembly embodying the advantageous
structural features and inherent meritorious '40 laminae 3 may be abutted. Such indentations
may be formed in the exterior periphery of the
characteristics hereinafter mentioned.
With the above primary and other incidental mWba-nd by relatively cheap punching operations,
objects in View as will more fully appear in the
speci?cation, the invention intended to be pro- I
‘thereby minimizing cost of production.
In lieu of indenting the enclosure band 4 at
tected by letters patent consists of the features 45 circumferentially spaced intervals, the indenta
tion may be continuous as at 1, Fig. 4. Such in
of construction, the parts and combinations
dentation may be rolled in the band or formed
thereof, and the mode of operation, or their
equivalents, as hereinafter described or illus-V, 7, by a spinning operation, thereby producing an
internal bead or rib Bagainst which the brush
trated in the accompanying drawings.
In the drawings, wherein is shown the pre 50 mount ring may abut. To preserve a smooth
uniform exterior surface and enhance the ap
ferred but obviously not necessarily the only
forms of embodiment of the invention, Fig. 1 is _, pearance of the band 4, the stop abutments or
protuberance may be formed by indenting the
a side elevation of an assembled electric motor,
interior surface of the band and thereby displac
partly broken away, in which the present inven
tion is embodied. Fig. 2 is an end elevation 55 ing the material into lugs without disturbing the
exterior face of the band.
thereof. Fig. 3 is a perspective view of the ?eld
' In Fig. 5 there is shown such alternative punch
ring assembly removed from the motor. Fig. 4
' formed abutment stops wherein the band is sub
is a detail sectional view illustrating a modi?ca
jected to forming pressure in an axial direction
tion of the construction disclosed in Figs. 1 and
3. Figs. 5, 6 and 7 are similar detail sectional 60 by which narrow indentations 9 are formed at
2
2,295,203
circumferentially spaced intervals in the interior
subject to breakage, but it also very materially
face of the band, and the material removed
reduces the costs of production. I
therefrom is distorted into a series of spaced lugs
From the above description it will be apparent
l6 against which the brush ring 5 engages.
that there is thus provided a device of the char
A very simple adaptation of the invention is
acter described possessing the particular features
that illustrated in Fig. 6 wherein a supplemental
of advantage before enumerated as desirable, but
stop ring H is welded interiorly of the band 4.
which obviously is susceptible of modi?cation in
Such ring may be relatively narrow and serve
its form, proportions, detail construction and ar
only as an abutment for the brush mount ring 5,
rangement of parts without departing from the
but is preferably of su?icient width to afford a ll) principle involved or sacri?cing any of its ad
stop at one side for the brush mount ring and
vantages.
at its opposite side for the ?eld laminae. Such
While in order to comply with the statute the
construction requires no machining operation
invention has been described in language more or
whatever and the two rings or bands 4—| I, which
less speci?c as to structural features, it is to be
?t one inside the other, are easily assembled
understood that the invention is not limited to
and welded to each other in their adjusted rela
the speci?c features shown, but that the means
tion by unskilled workmen.
and construction herein disclosed comprise the
A further adaptation of the the improved con
preferred form of several modes of putting the
struction, which however involves a machining
invention into effect, and the invention is there
operation, and hence is less desirable, is that
fore claimed in any of its forms or modi?cations
illustrated in Fig. '7. In such embodiment one
within the legitimate and valid scope of the ap
side margin of the band 4 is contracted by spin
pended claims.
ning as indicated at the left of Fig. '7, and there
Having thus described my invention, I claim:
after an interior portion of the contracted mar
gin is removed to form a rabbet or interior
1. In a dynamo-electric machine assembly, a
?eld ring comprising a group of laminae, a brush
shoulder l2 against which the brush ring 5 may
mounting ring, a band of sheet metal surrounding
abut. The internal diameter of such reduced
the ?eld ring and brush mounting ring, a
portion and the original internal diameter of the
plurality of interior axial indentations in the
band are equal, hence the brush mounting ring
band and protuberances formed by the indenta
and ?eld laminae 3, to be assembled in any of
' tions thereof a?ording stop shoulders for at least
the other embodiments of the invention illus
one of said rings.
trated, may with equal facility be assembled in
2. A dynamo-electric machine casing, includ
the form shown in Fig. 7.
ing end bells, a ?eld ring comprising a group of
In assembling the enclosure band about the
laminae, a brush mounting ring and an inter
?eld laminations, the band 4 may be preformed :;_~ mediate section comprising a band of sheet metal
and the assembly of laminae, either with or with
surrounding the ?eld ring assembly and the brush
out the coil winding therein, may be subsequently
mounting ring and abutting the end bells, said
inserted in the preformed band, or the band may
band being indented, and spaced interior stop
be rolled about the previously assembled ?eld
shoulders formed by such indentation and against
structure and welded in situ. Such punching, it) which the ?eld and brush rings respectively abut.
rolling or spinning operations as may be neces
3. A ?eld ring mount for a dynamo~electric
sary to provide brush ring abutments may be
machine, comprising an endless circular band of
either previously or subsequently formed. The
sheet metal enclosing a ?eld ring and a brush
heating of the band incident to welding causes
mounting ring, including an inwardly projecting
suf?cient expansion that upon subsequent cool
offset interiorly of the band intermediate the ?eld
ing a shrink ?t upon the laminae is effected.
ring and brush ring positions.
Otherwise, the band material may be pre-heated
4. A ?eld and brush ring mount for a dynamo
to achieve such result.
electric
machine, comprising a continuous cir
If necessary to insure accurate ?t with the rab
cular band of sheet metal enclosing a group of
beted end bells or heads I, the extreme edges of a:
?eld ring laminations and a brush ring, and an
the band 4 may be slightly inturned by spinning,
annular ring located interiorly of the band in
as at E3, Fig. 4, and a slight machine out made
spaced relation with one end thereof and forming
interiorly of the inturned edge, to size the band
spaced internal stop shoulders therein to main
for close ?tting engagement of the heads or end
tain the ?eld and brush ring in relatively sepa
bells. Ordinarily, however, the band is initially .~. rated
relation.
constructed su?iciently close to size to make such
5.
A
?eld ring mount for a dynamo-electric
additional operation unnecessary.
machine, comprising a sheet metal tube having
In lieu of forming and welding the band 4,
a smooth exterior surface enclosing a group of
sections of preformed metallic tubing of suitable
?eld ring laminae, and a brush mounting ring,
size and weight may be employed, and if pre (VT and
an internal integral stop shoulder project
heated preparatory to insertion of the ?eld lam
ing
intermediate
the ?eld ring laminations and
inae, may be shrunk thereon, or the laminae
the brush mount ring.
assembly may be pressed thereinto.
6. The herein described method of mounting a
To support the assembled motor, a lightweight
dynamo-electric ?eld ring and brush ring, in
stamped plate or sheet metal saddle l 4, contoured
, cluding the steps of inserting a group of ?eld
to agree with the curvature of the band 4 and
ring laminations in a preheated tube cooling the
having opposite uniplanar wings i5 is welded to
heated tube thereby shrinking the tube into
the band 4 as is shown in Fig. 2.
tight-?t engagement with the laminations and
The construction described not only greatly
deforming the interior surface of the tube thereby
reduces the weight of the ?nished motor and 3, providing
stop shoulders for the brush ring.
provides an unusually strong construction not
VICTOR L. DARNELL.
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