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Патент USA US2412254

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Déc. 10, 1946.
2,412,254
w. 5. EDELMAN
,MOTOR
Filed March 27, 1942
87 so 52 :3
s
INVENTOR
Walter E. Eda Lman
BYM
941M,
ATTORNEY
Patented Dec, 10, 1946
2,412,254
Ul‘tlTED STATES
T
FFICE
2,412,254
MOTGR
Walter E. Edelman, Minneapolis, Mil’lEL, assignor
to Minneapolis-Honeywell Regulator Company,
‘Minneapolis, Minn, a corporation of Delaware
Application March 27.. E942, Serial No. liddgioii
l2
no
Ulla
a
ll
éa
‘1
_'l‘his invention relates to the motor art but
more particularly to improvements in the con
structlon and arrangements of parts in electri
cal motors providing greater e?'iciency in oper
ation, promoting increased economy of construc
tion, facilitating assembly and increasing the ac-’
cessibility of parts for purposes of replacement
and repair. The present invention is concerned
primarily with improvements in relatively small
motors, but it will be understood that the fea
tures are not limited thereto and may be applied
to motors of other sizes as well.
A broad object of this invention is vthe provi
sion of a comparatively small motor which is
unusually powerful in proportion to its size.
Another object of this invention is to provide
a comparatively powerful motor in proportion
to its size by utilizing the necessary iron and
copper in advantageous proportions.
A further object of this invention is to provide
a motor having an advantageous copper to iron.
ratio by utilizing all available space for winding
purposes.
_
>
Another object of this invention is to provide a
stator comprising a plurality of laminated sec=
tions each having wound thereon a substantially
cone~shapeclwinding the sides of which. are sub
stantially coincident with its adjacent windings.
associated parts as removed from the rest oi the
device,
Figure 5 is an enlarged fragmentary view of
a portion of the stator vand casing,
Figure 6 is an enlarged face view of a stator.
section, and
Figure “I is a perspective view of parts of the
fabricated bobbin.
Referring to Figure l, the numeral it generally
indicates a motor operator which is illustrated
approximately to actual size. The motor oper
ator is is housed by a pair of telescoping casing
members if! and 62, the casing member i2 com
prising a cover and having anannular ?ange it
which is telescopingly received into the casing
member ii. The numeral M generally designates
a stator, to be described in detail hereinafter,
which is located in the main casing member ii.
A rotor ‘55 cooperates with the stator it and is
operatively secured to a shaft iii which is ro
tatively supported in a pair of bearings ill and
ill carried by and concentrically disposed with
respect to the casing members it and t2 respec~
tiveiy. rl‘he bearings ii and is will be described
in greater detail hereinafter.
Therotor shaft
it) drives an operator shaft is through a gear
train, generally indicated by the numeral
It
will be noted that though the rotor 55 is sup
pd'ted by separate inter?tting members it and
Another object of this invention is to provide 30 ii, the proper alignment of shaft l is assured
by virtue of the telescoping arrangement of the
casing members it and i2. Since the novel fea
tures of the motor operator ill pertain primarily
to the novel structure of the stator ill, and the
novel means for retaining the stator sections in
assembled relation.
1%. iurther object of this invention is to provide
novel bobbin which is fabricated upon the
stacked laminae COmprlSing a stator section in
such a manner as to permit a winding to be
wound thereon.
-
Other objects relate to novel means for lubri
cating the motor shaft and gear train driven
thereby, novel bearing construction, novel con
struction assuring proper bearing alignment, and
novel motor housing construction.
Still other objects are those'not speci?cally re
citei hereinabove which will become apparent or
implied from a reading of the speci?cation, ref;
erence being had to the accompanying drawing
in which
'
‘ novel manner
which it is mounted in the casing .
it is thought expedient to first describe the
stator construction and mounting in detail after
which the other novel features of the motor oper
ator which are incidents thereof will be similarly
disposed of.
Referring to Figure 5, it will be seen that the
stator it comprises a plurality of identical inter
loclrable sections‘lii. Each section
comprises
a plurality of larninations
(see Figures 1 and
6) which are held in stacked relation by a field
winding
which is wound directly on each sec~
tion
Each section 2i has an arcuate yolre
Figure 1 is a section of the device through the
rotor shaft as viewed along the line i—-i of
portion
which conforms with the inner cylin
drical surface of the casing‘mernber it, a pole
Figure 2,
>
50 face portion
which is concentrically ‘formed
Figure 2 is a. face view of the device with the
with respect to the casing ii, and a pole portion.
cover and rotor removed,
2E radially disposed with respect to the casing i i.
Figure 3 is a face View of the terminal block
as viewed along the line 3-3 of Figure 1,
Figure 4 is an inside face View of the cover and
Each yoke
pole portion
portion is25extended
carries ato?eld
eachwinding
side of the
mole portion, the extension on one side having a
2,419,254
,
3
‘
r
tongue 2? and a groove 28 and the extension on
the other-side having a tongue 2b which engages
4
?rst pair of insulation pieces 38, 32 as indicated
.by the dotted lines in Figure 6.
The bobbin
. the tongue and groove of the adjacent section.
pieces 33, 3d are substantially H-shaped, each
The arrangement of the tongue 2i, groove 28, and
having outer and inner doubled-back portions
35, 36 and 31, 38 respectively, which cooperatively
comprise the outer and inner ?ange portions of
the bobbin. The doubled-back portions 35, 36 of
tongue 29 of each section is such that when the
sections 2| are assembled and a circumferential
pressure is applied as by an annular ring, band,
or, as in the illustrative case, the casing ii, the
reactions between the tongue 21, groove ‘28, and
tongue 23 rigidly hold the‘ pole face portions 25
in circumferentially spaced relation. In practice,
, the bobbin piece 33 comprise upper and lower
extensions 39 and fit which extend transversely
‘above and below the pole portion 25. Likewise
the doubled-back portions 37, 38 have extensions
Iii and M which extend transversely above and
below the pole portion 26 in overlapping relation
sure is applied by means not shown, and the
with‘ respect to the extensions 39 and 40. The
stator M is then pressed as a unit into the casing
i i. It should be pointed out that the interfitting 15 flange portions 35, 36 and 37, 38 may be regarded
as the vertical bars of the H-shaped bobbin pieces
relation of the sections provides a low reluctance
the sections are assembled, a circumferential pres
magnetic path in the yoke of the stator, and the
33, 36, and the portions thereof adjacent the sides
cross section of the yoke may be a minimum
consistent with good engineering practice since
the need for holes for receiving rivets, bolts or
of the section 2! may be considered the cross
the like, is obviated. Accordingly, the resultant
overlapped in such a. manner as to prevent a
reduction in the amount of iron necessary in the
stator makes available a greater space for wind
catching of the winding 23 on the extensions in
the process of winding it in the bobbin 3.
In practice, each section 2! is fabricated by.
first stacking the laminations 22. The insulation
pieces 3! and 32 are then placed on the top and
bottom of the stack respectively. The bobbin
‘ ing'
purposes.
Consequently, by obtaining a
greater proportion of copper to iron, a more com
pact and smaller motor may beobtained which \
is comparatively more powerful in proportion to ,
bars of the H-pieces. As will 'be pointed out
hereinafter, the extensions 39, at and 5!, 1:12 are
its size.
pieces as, 3% are then placed adjacent the sides
It will be seen in Figure .5 that each pole face
of the pole portion 26 between the lateral exten
portion 25 is of a maximum width nearly touch 30 sions of the yoke and pole face portions. The
ing its adjacent pole face portions. The width
upper extensions iii , d2 of'the bobbin piece 36 are
of each pole face portion 25, therefore, is deter
placed inwardly of the upper extensions 39, it of
mined by a central an‘glewhich is a function of
the bobbin piece 33. Likewise the lower exten
sions 39, iii! of the bobbin 33 are placed inwardly
the number of poles. Since all-of the sections 2!
are identical it naturally “follows that the width 35 of the lower extensions iii, d2 of the bobbin piece
of each yoke portion 2a is likewise determined
by the same central angle. In the illustrative
case, the stator it has 8 physical poles and ac
cordingly the dimensions of each section 2! are
343. Thus, by the overlapping arrangement of the
material such as gray ?bre.
:39 extends adjacent to a terminal 41 on the ad
extensions, as clearly seen in Figure 5, it is pos—
sible to wind the winding 23 in vthe direction of
arrow 63 without the windingbeing caught on
determined by a central angle of 45° as shown in so the extensions. It will be noted that the faces
v(iii of the yoke portion extensions are formed nor
Figure 5. It will‘ be further noted that the cross
mally with respect to theirlpole portion 25 to sup
section of the pole portion 26 is considerably less
port the doubled-back portions 35, 31 of the bob
thanithe cross section of its pole face portion 25.
bin pieces 33, st normally of the pole portion 26.
While this arrangement precludes the use of a
Likewise the insulation pieces Si, 32 have nor.
preformed ?eld winding 23, it has the advantage
mally extended surfaces 65 for supporting the
of making available a greater space for the wind
doubled-back portions 3, 38 of the bobbin pieces
ing without objectionably increasing the-reluct
33, 3d normally of the pole portion 26. Thus, each
ance of the magnetic path in. the pole portion.
section 2i may be rotated‘about the axis of its
Each winding 23 is formed substantially cone
shaped, being wound to‘such dimensions as to so pole portion 26 and the winding 23 wound in'the
bobbin 30 by a simple winding process without
be substantially included ‘in the central angle
the need of a complicated guide means. To hold
hereinabove referred to. Accordingly, each side
of each winding 23 is substantially coincident with
each bobbin 3 in assembled condition before
the winding. process is begun, a single layer of
the side' of the adjacent winding thereby utiliz
ing practically all of the available ‘space occupied 55 tape fit is wound about the pole portion 25. The
.section is then mounted in a suitable winding jig,
by the stator except such space as ,is necessary to
not shown, and the winding wound directly in
prevent a short circuiting between windings. As
the bobbin forming the cone-shape‘ referred .to
a matter of fact, when the stator is viewed-from
hereinabove. The ends of the windings are then .
one side, as in Figure 2, there is substantially no
secured to inner and outer terminal pieces d7, 48
air space between the windings.
’
secured to the upper extensions 39, Ml of bobbin
To properly insulate each winding 23 from its
piece 33, as best seen in Figures 5 and 6. The
section 2! as well as to properly con?ne the‘same
winding 23 is then coated with a suitable seal
to its cone-shape thereon, a bobbin 3% is fabri
ing compound such as glass cement or varnish
cated about the pole portion 26 of each section
2!. Each bobbin 3!! comprises a ?rst pair of 65 to hold the winding turns of greater radii from
insulation pieces 3!, 32 which may be formed of
slipping down over the turns of lesser radii. The
sections 2! are then assembled as previously de
any suitable material such as Bakelite. Pieces
- 3 I, 32 are shaped similarly to the section lamina
scribed, and inserted as a unit into the casing
member ii‘, To prevent the inner terminals Ill
tions 22 ,and are disposed at the top and bottom
respectively of each section 2!. Each bobbin 30 70 from moving inwardly'and short circuiting each
other, a flag i9 is provided on the doubled-back
further comprises a second pair of. insulation
portion 383 of each bobbin piece 34. Each ?ag
_ pieces 33, 34 which may be formed of any suitable
Pieces 33, 3d are
disposed adjacent the sides of each pole portion
jacent section 2! as best shown in Figure 5. To
26 in overlapping relation with respect to the 78 prevent the outer terminals 41 from moving out
2,412,255
5
wardly and engaging the casing ll, a-ring 5G is
placed around them. The ring 50 may be formed
6
The bearing ll is supported in a hub 86 which
is extended inwardly of the casing ii to reduce
of a. strip of gray fiber the ends or’ which are
interlocked as seen in Figure 2.
the overall length of the motor operator it as
well as to utilize the space between the rotor l5
The stator i4 is held in position in the casing GI and the casing end wall resulting from the ex
H by a pair of retaining means in the form oi’ a
tension of the coil 23 to each side of the stator
shoulder 56 formed in the casing ii and a split
it. The hub
is spaced somewhat from the
ring 52 which is received in an annular groove
closed end of the casing ii and is integrally con.
53, also formed in the casing l i'; The ring 52 has
In prac
'nected therewith by an arcuate web
turned up ends to by means of which the ring 10 tice, the casing it is ?rst received in the form
may be removed from the groove and the stator
of a rough casting in which the hub
projects
it removed from the casing for such purposes as
directly from the closed end of the casing, the
repairing or replacing the stator section it. Dne
hub till and web 55 appearing as indicated by
or more rings 55 of resilient material such as cork
the full lines in Figure 2. The bearing support
or any other suitable compressible material are 15
is formed by first boring the aperture in which
inserted between the stator id and the retaining
the hearing it? is received concentrically with re
means
The rings
ful?ll a dual pur
spect to the casing ii. The aperture is then
pose, serving to talte up the variations in the
counter-bored until the arcuate web
is formed
.thicltness of the stators
resulting from the
and an opening is provided between the hub 53!}
variations in. the thickness of the laminations
and the closed end of the casing ii. The casing
E22, and also serving to absorb somewhat the mag
‘ii is then further counter-bored and a plug 65
netic vibrations set up in the stator ill,
is inserted therein to again close the casing.
As shown in Figure 2, the windilgs 2 are con
Bearing ii’ is lubricated by an oil conductive
nected to provide a split phase induoti
.otor
means which may be in the form of a felt pad
arrangement in ‘which the tour lead w
which is disposed adjacent to the closed end
brought out to a terminal blocli
The tm iinal
of the casing it and has a portion
which ex
block till has a hub portion
which is i
t
a
in a circular aperture 5.; formed in the casing
member
connected
matter
are bared
ofit.
for
fact,
to The
the
a length
inwires
lead
actual
corresponding
wires
practice,
of a cable
arethe
to
el
tends
The pad.
between
6i extends
the hearing
into theitoiland
which
the isplug
main
1"
islead 38
'
wires 56 and extended through apertures ‘35? pro
vided in the terminal block. The apertures 62 are
then ?lled with solder, thereby providing an oil
ed approximately at a level as shown in Fig
l. The bearing
accordingly, is lubricated
use
capillary
bearingaction
is supported
of the oil in
by the
a ?ange
pad 89 pro
tight connection with respect to the casing i i.‘
vided
the
p-orted
casing
The bored lead wires 5"‘? are covered with
suitable screws
suit
a plate ll? which is tclescopingly received
casing member it. The plate it is sup
on posts 'Jl integrally formed with the
member 42 and secured to the. posts by
The gear train
is rotatively
able insulating material such as synthetic rub~
supported between the plate
and the casing
“oer, which is not subject to deterioration by the
member
the operator shaft it being rotatively
action of the oil which is maintained in the mo 40 supported in a bearing l3 staked to the plate ‘ill
tor operator housing for purposes of lubrication
and a bearing
conveniently supported in the
as will hereinafter appear. A washer
(see
casing member it. A gear ‘l5 operatively secured
Figure l) of suitable insulation material such as
to the shaft is is driven by a dual gear ‘it which
gray fiber is placed between the casing member
in turn is driven by a second dual gear ill. The
i2 and the terminals iii and
to insulate them 45. gear ll is driven by a pinion it which is oper
from the casing 52.
atively secured to the motor shaft iii. It is ob
‘Having fully described the stator in including
vious that because of the arrangement of the
the details of its construction, fabrication, and
inountinr‘ with respect to the casing member ‘l i;
the rotor
will now be described in detail in“ 50 movable as a unit from the casing nie iber it.
cluding the manner in which it is rotatively sup
ported so as to cooperate eiiiciently with the
stator‘ ill, the manner in which it shares a com~
more support with the gear train
so as to pro
vide a proper driving connection therewith, and
the manner in which the gear train and rotative
support for the rotor
are lubricated,
In. the foregoing description of the stator ill
have
it hasbeen
been rigidly
seen how
spaced
the pole
circumferen
faced portions
it
concentrically with respect to the casing member
it without the use of rivets, bolts,' or "1 e like
holding means, and without the need of lnachin=
ing the pole faces ‘to assure their concentricity.
Since the rotor it is of the squirrel cage induc
tion type, the importance of the proper align
rnent of the stator M and rotor it will be ap
preciatecl inasmuch as a smaller air gap
made
possible resulting in greater e'fdciency.
It will now be seen how the bearings
it for
the rotor shaft to are supported so as to assure
the concentricity of the rotor
with respect to
the casing member i 5 thereby providing enlcient
cooperation between the rotor it and the stator
it.
pinion ‘iii and rotor it on opposite sides of the
plate
the rotor and easing member 92 are re
Consequently, the driving connection between
the rotor iii and the gear train
is not dis
turbed by such a removal. 'Furthermore, the
removal of the rotor
renders the stator more
ac‘iessible for purposes of inspection and repair.
The dual gears ‘is, ‘it’ are mounted for rotation
on. pins l3 Elli respectively which are staked to
which
plate formed
and received
in the casing
into member
sockets ti and
From
the foregoing, it is obvious that the concentricity
of soaring i=3 with_ respect to the casing member
ii is assured by the telescoping relation of the
plate
with respect to the casing member it
which in turn is telescopingly ?tted with respect
to the casing member it. Moreover, the proper
meshing relation of the gears of the gear train
is assured by virtue of the telescoping ar
raneernent of the plate "ill with respect to the
casing rnember iii and the provision of the soclo
ets iii,
for receiving the pins l9, 8d respec
tively.
\
The lubrication of shafts iii and id in bearings
it and ‘i3, respectively, and lubrication of dual
gears ‘i6 and l'] on pins ‘iii and 85) respectively,
is provided by an oil conductive means which
aaraast
7
&
.
overlapping and insulating the terminal piece
may be in the form of a felt pad 83 which is dis
carried by the adjacent bobbin side portion.
posed adjacent to the plate 10. The pad 83 is
4. In a motor, a pair of telescoping casing‘
arranged to surround the pins 79, 89, the shaft
16, and the bearing 13 are lubricated by the capil
members, a, stator in a ?rst of said members, a
lary- action of the oil in the pad 83. As in the Cl rotor for cooperation. with said stator, a. shaft for
said rotor, a plate telescopingly received in the
case of pad 67, the pad 83 also extends below
second of said members and secured thereto, said
the level of the oil as best seen in Figure 1. It
shaft being journalled in said plate and said ?rst
will be noted that the gear train 20 also extends
casing member, and a gear train journalled be
‘somewhat below the, level of the oil. Conse
quently the oil is further distributed to the gear 10 tween said secondmember and said plate in driv
able relation with respect to said shaft, said rotor
train parts by means of a “splashing action”
being removable from said ?rst member together
which results from the rotation of the gears,
with said second member whereby said rotor and
Oil is admitted into the motor operator hous
gear‘train are removable as a unit.
,
ing through suitable removable plugs 85! which
5. A motor operator comprising a pair of tele
are conveniently provided in the casing member
scoping casing members, a bearing concentrically
l2 as best seen in Figure 4. The plate 70 is pro
supported by each member in axially spaced re
vided with four indentations 85 which permit the
lation with respect to the end portion thereof,
oil to reach the felt pad 6?. Accordingly, the
oil conductive means for_lubricating said bear
motor operator‘ it] may be placed in any one of
ings and disposed between each said bearing and
four positions without interfering with the proper
the end portion of its respective supporting mem
lubrication of the operating parts.
'
ber, a rotor journalled in said bearings, a gear
Each casing member is provided with four 00- .
train driven by said rotor and journalled in one
operating apertured ears 86 by means of which
the casin'g members may be assembled in any
one of four positions with respect to each other,
of said casing members, said geartrain being
lubricated by the oil conductive means in said
one of said casing members, and a stator for co
thereby providing four diiferent positions of the
operating shaft 16 with respect to a particular
mounting of the casing member H. Suitable
bolts and screws 81 may be used to secure the
casing members together.
_
operation with said rotor, said stator comprising
a plurality of interlockable sections insertable as
a unit in the other of said casing members in
30 concentric alignment with respect to the rotor,
and retaining means for providing axial align;
ment of said stator with respectto said rotor.
6. A multi-polar motor stator comprising a plu
From the foregoing it is now apparent that I
have provided a compact motor which necessarily
is comparatively powerful in proportion to its
size since all available space has been utilized
rality of circumferentially related stator sections,
35 each section comprising a radial pole portion, a‘
bobbin supported thereon,‘ a winding on said bob
vantageous ratio of copper to iron. Moreover,
'the motor may be economically produced. and ' bin, said bobbin having a central portion for en
for winding purposes, thereby providing an ad
eiilciently operated in practice‘ because of the
novel construction, fabrication, and arrangement
of parts.
_
closing said pole portion and inner and outer side
portions for con?ning said winding, said wind
40
It is to be understood that the disclosure of
the present invention is illustrative only and not
to be considered in a limiting sense, since I con
template all such changes, variations, adapta
tions, additions, and omissions, which naturally
fall within the inventive concept of this inven
tion as defined by the appended claims.
I claim as my invention‘:
1. In a multipolar stator, a stator section‘ com
prising a radial pole portion of uniform cross
section, a yoke portion extended normally tov each
side of said pole portion, and a pole face por~ .
ing being cone-shaped,dimensions of said winding
and said inner and outer side portions of said ‘
bobbin being determined by a central angle
which is a function of the number of the poles,
and terminal pieces carried by said inner‘ and
outer bobbin side portions for electrical connec
tion with said winding, 9, further portion of one
of said inner side portions of each of said bob
bins bearing a member projecting laterally,
whereby to inwardly overlie said terminal piece
carried by said inner side of an adjacent bobbin,
and insulated means surrounding said stator and
outwardly overlying said terminal pieces carried
by said‘outer sides of said bobbins.
.
tion extended to each side of said pole portion,
'7. A multi-polar motor stator comprising a
‘said extension of said yoke and pole face por 55 plurality of circumferentially related stator sec
tions being determined by a central angle which
tions, each section comprising a radial pole por
is a function of the number of poles.
v
tion, a bobbin supported thereon, a winding on
2. In a multipolar stator, a stator section'com
vsaid bobbin, said bobbin having a. central por
prising a radial pole portion, yoke and pole face
tion for enclosing said pole portion and inner
portions extended to each side of said pole por 60 and outer side portions for con?ning said wind-'
'tion, and a bobbin comprising a central portion:
ing, said winding being cone-shaped, dimensions
for enclosing said pole portion and inner and
of said winding and said inner and outer side por
outer side portions disposed adjacent said pole
tions of said bobbin being determined by a cen
face portions and yoke portions respectively, said
tra1 angle which is a function of the numberof
bobbin side portions'and said yoke and pole face 65 the poles, and terminal pieces carried by said
portions being limited by a central angle which
inner and outer bobbin side portions for elec
is a function of the number of poles.'
trical connectionwith said winding, 9. further
3. In a multi-polar stator, a radial pole por
portion of- one of said inner side portions of each
tion, a bobbin supported thereon, a, winding on
of said bobbins bearing a member projecting
said bobbin, said bobbin having a central portion
_ for enclosing said ‘pole portion and inner and
outer side portions for con?ning said winding,
terminal pieces carried by said side portions for
connections. with said windings, and a lateral
1 extension on one of said inner side portions for
laterally, whereby to inwardly overlie said ter
minal piececarried by said inner side of an ad- _'
jacent bobbin.
-
4
v
8. A'multi-polar motor stator comprising a
plurality of circumferentially related stator sec
tions, each section comprisinga radial pole por
2,4123%
9
11. A mu1ti=polar motor stator comprising a.
tion, a bobbin supported thereon, e winding on
said bobbin. said bobbin having a central p0r~
plurality of identical, ciroumiferentieliy adjacent
sections each having a redial pole portion, an
tion for enclosing said pole portion and inner
and outer side portions for con?ning said wind
ing, said winding being cone-shaped, dimensions
enlarged pole face portion extending to each side
of said pole portion and e yoke portion extend
mg to each side of said pole portion, each yoke
portion being formed to interlock with adjacent
yoke portions and including an inwardly ‘facing
pleine surfeee extending to each side of said poie
of the poles, terminal pieces carried by said in
ner and outer bobbin side portions for electrical iii portion and perpendicular to the axis thereof,
no part of sold yoke portion extending beyond
connection with said winding, and insulated
said surfeee in the diseotion oi.’
enlarged
means’ surrounding said stator end outwardly
poie face, the ones of said pole portions being’
overlying said terminal pieces carried by said
of saidwinding and said inner and outer side
portions of said bobbin being‘ determined by a
central angle which is a function oi’ the number
outer sides of said boioioios.
9. in 2. motor, e stator, e rotor for cooperat
direoted toward as common point, and said em
15% tensions of solid yoke and ooie iece portions of
ing therewith, o shaft for said rotor, side wells
eooii of said sections being determined
e thebyout=
and end walls comprising a poi? of cosine7 mem»
' one-"lo
line of
bers housing said stator and said rotor, bearing
supports carried by said members and disposed
in eisieiiy spaced reietiozisi'iip therewith for so»
tota’siy supporting said shaft,
with said goiene
some to i'eeeive
winding
surrounding said looie Emotion‘
interme~
diary between said members and said suionorts,
at least one of said moons being int-semi with
and overlying a portion of the reieted member,
and oii conducting means ieetweeo said support
is
y
1
and said member and extending to seid side
s‘ie'
~
weiis of said mem‘oer
L,
tiiroiig'i'i said support for i'oiisi
with said oii eondizetine means.
In as motor
o sotor so?
for rotation in said casing", s
rote-r,
iobrieotino s
'rotor shell, ooinorisiog’ "iie silo-it,
'
for
silent, said end
tiiioogii said means;
at its
1? solid
end oi
i’ori I
soid sin-ft
for:
mu
Certi?cate of Correction
Patent No. 2,412,254.
December 10, 1946.
WALTER E. EDELMAN
It is hereby certi?ed that errors appear in the printed speci?cations of the above
numbered patent requiring correction as follows: Column 7, line 4, after “bearing
73” insert which; column 9, line 30, claim 10, for the Words “motor casing” read
motor, a casing; and that the said Letters Patent should be read with these corrections
therein that the same may conform to the record of the case in the Patent O?ice.
Signed and sealed this 9th day of November, A. D. 1948.
[SEAL]
THOMAS F. MURPHY,
Assistant Commissioner 0 f Pa'temfs.
Certi?cate of Correction
Patent No. 2,412,254.
'
December 10, 1946.
WALTER E. EDELMAN
It is hereby certi?ed that errors appear in the printed speci?cations of the above
numbered patent requiring correction as follows: Column 7, line 4, after “bearing
73” insert which; column 9, line 30, claim 10, for the Words “motor casing” read
motor, a casing; and that the said Letters Patent should be read With these corrections
therein that the same may conform to the record of the case in the Patent O?ice.
Signed and sealed this 9th day of November, A. D. 1948.
[SEAL]
THOMAS F. MURPHY,
Assistant Commissioner of Pa'tents.
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