Sept. 22, 1931.
R H, JORDAN
1,823,979
LAMINATION FOR DYNAMO ELECTRIC MACHINES
Filed May 3, 1929
Figi.
l
IZ
/4
INVENTOR
R ich ard H. Jordan.
BY
ÁTTORNEY
Patented Sept. 22, 1931 '
1,823,979
yUNITEI) STATES
PATENT oEFlcE- c _ Í
RICHARD
HOUSE H.
ELECTRIC
JORDAN,à 0F
MANUFACTURING
SPRINGFIELD, MASSACHUSETTS,
COMPANY, A CORPORATION
ASSIGNOR TO
0F PENNSYL
VANIA
LAMINATION FOR DYNAMO-ELECTRIC MACHINES
Application ined May s, 1929.l serial No. 360,279.
My invention relates to dynamo-electric
over. A set of laminations is adapted
machines and particularly to field-magnet headed
to be held in proper operative position in a
laminations.
Y
i
'
j
y
‘ housing (not
shown) by supporting rods
An object of my invention is to provide a
(not shown) which extend through holes 16.
punching with a plurality of symmetrical `As
_these latter elements constitute no part
pole pieces, of largest possible pole area said
my invention and are well known in the
pole pieces embodying slots for the recep of
art,
I have not deemed it necessary to illus
tion of parts of shading coils.
trateor describe them in detail.
Another object ofl my invention is to per
10 mit the use .of small shading coils While ob
Referring to Fi . v2 and 3, I show a plu
rality of assemble laminations each ,includ
taining comparatively large shaded-pole 'ing
the yoke portion 11 and a plurality of
salient
pieces 12, each of said pole pieces
Another object of my invention is to pro having pole
a
pole
face the peripheral width of
vide a salient pole piece having a slot there
15'1n for the reception of one side of a shading which is substantially larger than the periph
width of its neck portion. One side of
coil of resilient metal, thereby eliminating` eral
a
resilient
shading coil 17, (Figs. 4 and 5),
the need of additional holding means. ,
is
located
in
a shading-coil'slot l8fthat is
In practicing my invention, I provide a
punching of magnetic material with a plural- ' substantially parallel to one side of the pole
20 ity of pole pieces integral therewith and ex- ‘ iece 12 which contains it, the shading coil
eing of substantially rectangular form, the
tending radially therefrom, each of said longer
of which aresprung inwardly
pole pieces having a shading-coilv slot therein during sides
the
process
of manufacture. When
extending substantially’tangential to the sur placed in operative position
von the pole piece
face of a cylin er that is concentric With the _12, the shading coil lassumes theform indi
inner faces of the pole pieces and being par cated‘by'the-broken lines in Fig. Á.land is
ticularly adapted to receive one side of a held
in proper operative position by its in
shading coil of inherent resiliency.
'
areas.
55
60
^
In the single sheet of‘drawin'gs,
.
»
herent resiliency.
65
70
75
'
Flexible insulating material 21 adaptable
Figure 1 is a view, in front elevation, `ofa to any irregularities ip the inner contour of
single lamination having a plurality of pole? said
laminations, extends alongr the inner pe
pieces and shading-coil slots therein, .
riphery
of the yoke between 'the pole pieces
Fig. 2 is a view, in front elevation, of a> and also along the outer surfaces of the pole
plurality of laminations partially wound, pieces. A coil 22, of proper form vand size,
vthe
main field coils being shown in section, and representedin section, is located in prop- _
85
80
Fig. 3 is a View, in longitudinal section, of er operative position around the neck por
a plurality of assembled laminations taken tion
of the pole pieces 12, substan
on the line III-III of Fig. 2, the field coils tiallyofaseach
shown ‘in Flg. 2.
being omitted,
ing coil.
A sheetfsteekpunching comprises a yoke
portion 11, a plurality of salient pole pieces
12 integral therewith and extending radially
therefrom, each pole piece being substantially
symmetrical relative to a radial line there
50'
85
_
I- have shown laminations suitable for
Fig. 4 is an end view of a resilient shading mounting
inside a supportingA frame of a
coil, and
'
J Fig. 5 is a top plan view of the same shad dynamo~electric machine and adapted for the
reception of a rotor between the vaxis of the
45
80
90
said laminations and the periphery of its pole
lpiece faces. It is obvious -that my invention
is not limited to stator laminations but may'
be applied to either stator or -rotorlamina
tions or to both.
"
`
By using a substantially symmetrical pole
through, a. plurality of peripherally spaced piece,
the saturation of the punching is sub
holes 13 being provided for receiving rivets stantially
equal all along the íiux path, and 14, (see Fig. 3) the end of which may be the addition
of a shading-coil slot substan
95
100
2
' 1,823,979
tiallyl tangential to a cylinder that is con
centric with -the pole faces ofthe lamina
tions requires only a shading coil, of small
Width, and results in a decrease in the copper
loss therein, while obtaining a relatively
large shaded-pole area.
.It will also be noticed that, by producing
substantially symmetrical pole pieces the
size of the laminations, and, consequently, ,
that of the entire machine may be decreased
for a given output, since the available iron
is made more e?fective,both electrically and
mechanically, or, conversely, a greater >main
coil area and resultant greater output may
'be obtained for a given stator punching.
" Among the several advantages of my in
-vention are the simplicity of installing pole
windings and their _subsequent ease of re-,
placement, economy in manufacture, and ‘
“ added eiiiciency of operation because? of bet
ter action of the larger shadedpole area and
the increased main-coil area.
Various modiiications may be made in the _
device embodying my invention withoutde
parting from> the spirit and scope lthereof,
and -I desire, therefore, that only such limi
i vtations shall be placed thereon as a?e imposed
by. the prior art or set forth in the appended
’ claim.
»
I claim as my invention:
A laminated core structure embodying a l
plurality of laminations each including ' a
yoke portion, a plurality of pole pieces each
having a smaller area of neck portion than
the area of the pole face such that the straight
sides of the pole pieces are substantially tan
gential to the cylinder deiined by the pole
piece faces and each pole piece being `sub
stantially symmetrical relative to a -radial
` line centrally therethrough, each pole piece
having'a slot therein parallel to the adjacent
straight side, and a shading coil of resilient
_metal frictionally gripping the edges of the
pole portion enclosed thereby.
In testimony whereof, I havev hereunto
i' subscribed my name this 29th day of‘April,
1929.
`
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RICHARD H. JORDAN ,