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Патент USA US2403421

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July 2, 1946c
M; P. WINTHER
ELECTROMAGNETIC APPARATUS
Filed March 12. 1945
'
6 sheets-sheet 1
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July 2, 1946.
M.
WINTHER
2,403,4214
ELECTROMAGNETIC APPARATUS
Fíled'March 12, 1945
/l "
l
6 Sheets-Sheet 2
July 2, 1946.
M. P. WINTHER
_
2,403,421
ELECTROMAGNETIG APPARATUS
Filed March 12, 1945
6 Sheets-Sheet 3
July 2, 1946.
M. P. wlNTHER
2,403,421
ELECTROMAGNETIC APPARATUS
Filed March l2, 1945
6 Sheets-Sheet 4
July 2, 1946. l
M. P. WIN'THER
ELECTROMAGNETIC APPARATUS
2,403,421
July z, 1946.
A M. P. WINTHER
2,403,421
ELECTROMAGNETIG APPARATUS
Filed March 12, 1945
n 6 Sheets-Sheet 6
NOE
2,403,421
Patented July 2, 1946
n
.
UNITED STATES “PATENT oFFl-cE
ELECTROMAGNETIC APPARATUS
Martin P. Winther, Waukegan, nl., assigner to
Martin P. Winther, as trustee
Application March 12, 1945, Serial No. 582,301
1 -
-
18 Claims.
This invention relates to electromagnetic ap
paratus, and with regard'to certain more spe
(Cl. 18S-104)
2.
Referring now moreparticularly to Fig. l, there
ciiic features, to high-speed, high-capacity dy
is shown at numeral I a platform, upon which
are mounted pedestals _3 and 5 (Fig. 2). The
namoineters and the like.
pedestals 3 incorporate bearing structures which
_
-
~
Among the several objects of the invention
may be noted the provision of a water-cooled,
eddy-current. dynamometer adapted to operate
safely at high speeds and to absorb heavy loads;
the provision of a dynamometer’of the class de
scribed which will pass large volumes of cooling
water for high rates of energy absorption with
out introducing parasitic unsteady torque; the
completeness. Each of thes'e bearings (note the
one of Fig. 3 for example) consists' in enclosing
members 1 and 9 wherein are supporting bear
ing rings II and I3 for supporting outer bearing
flanges I5 of a ring gear I1, the rim of the latter
provision .of a machine of the class described
which employs a rotor and a method of cooling
the ring gear containsthe outer race 2| of a
roller bearing 23.
it adapted to >minimize distortions under high
bearing 23 is carried on a neck l21 of a rocking '
are not new herein but which are described for
extending radially between the bearing rings II
and I3 (see also Fig. 5).
An inner hub I9 of
The inner- race 25 of this
rotor speeds; and the provision of a machine of
stator S, to be described hereunder in detail.
this class which is simple and economical to build
As indicated in Fig. 5, the teeth 29 of the gear
and maintain. Other objects will be in part ob
I1 mesh with a pinion 3l on a countershaft 35
vious and in part pointed out hereinafter.
supported in outboard bearings 33. The counter
'I'he invention accordingly comprises thev >ele 20 shaft 35 carries a sprocket 31 connected by a
chain 39 with a sprocket 4I on the shaft 43 of a
ments and combinations of elements, features of
construction, and arrangements of parts which
worm-gear speed reducer 45. The speed Areducer
will be exempliñed in the structures hereinafter
45 is continuously driven from a motor 41. The
described, and the scope of the application of
' purpose of this type of bearing for each neck 21
25 is to maintain a continuous slow rolling of the
which will be indicated in the following claims.
In the accompanying drawings, in which is
bearings 23 so that each does not continuously
illustrated one of- various possible embodiments
load one spot on the races 2| and 25, as would
be substantially the case if these bearings did
of the invention,
‘
.
Fig. 1 is an end view of one component dy-not continuously progress~` It will be appreciated
narnometer unit embodying features of the in 30 from what follows that each neck 21, although
vention;
it'rocks slightly, is essentially stationary during
Fig. 2 is a left-side view of Fig. 1;
operation, the anti-friction bearing being basic
Fig. 3 is a partial longitudinal section of one
ally necessary for the purpose of preventing loss
unit on a slightly enlarged scale with respect to
of torque applied through the stator S to a suit
35 able dynamometer measuring scale.
that of Fig. 1;
Fig. 4 is a vertical section taken online 4-4
The stator S will now be described. It consists
of Fig. 3i
I
of opposite heads 49 and 5I.- Since the interior
construction of the head 49 also exemplifies the
Fig. 5 is a horizontal section taken on line
5-.-5 of Fig. 1 but on a further enlarged scale;
40 interior construction of the head 5I, only the
Fig. 6 is a diagrammatic plan view of several
former will be described in detail so far as in
combined units embodying other features of the
terior parts are concerned. Referring to Fig. 3,
invention; and
'
I
it will be seen that the neck 21 is on a bell 28
Fig. 7 is a detail section taken on line
bolted to the head 49. In addition there is bolted
of Fig. 6.
-'
.
45 to the inside of the head 49 a sleeve bearing 53
which supports a gudgeon 55 of a rotor R, also
Similar reference characters indicate corre
sponding parts throughout the-several views of
to be described. A labyrinth assembly 51 is car
the drawings.
‘
ried on the inside of the head 49 and has annular `
Increasing sizes of engines to be tested at high
labyrinth dams 58 engaging portions toward the
speeds are presenting increasing problems in the 50 rotor R of the gudgeons 55. One or more oil leads
dynamometer test. ileld. By means of the appa
, 59 having flexible exterior connections lead oil-
ratus herein described 15,000 H. P. may be ab
sorbed at from 8,000 to 12,000 R. P. M. This is
done with relatively simple and safe apparatus
requiring a. minimum in control organization.
to the bearings 53y and an overflow of pipe 92
carries off excess oil and' foreign material. A
flexibly connected air port 8| serves to apply
pressure to resist incipient lleakage into the
9,403,431
.
ing shown at 04.
‘
_
The connections 91 pass through the outer cyl
inder 0l through openings |01. Each water ring
0l is provided with a lower drain pipe as indicated
at |00.
They are also
joined by means of preferably nonmagnetic rings
1l.` although the latter may be magnetic. since
the iiux leakage lost through them is ordinarily
negligible. Members Il, I1, 00,»1I, 13 and 1l
p
have less resistance against bending than a single .
one of the same capacity. Thus another source
of parasitic torque on the stator is minimized.
The outer periphery of each head such as 4I
is bolted as indicated at 83 to an outer cylinder
Il. Within endwise rings B1 this cylinder car
ries an inner magnetic cylinder 80 made up of
a series of rings 33 and 10. These rings are
Joined by .pocket-forming rings 1| and 13 also
composed of magnetic material.
4
bility. The reason for making the water con
nections 0B inv multiple, is that such connections
labyrinth packing l1, the outlet for this air be
10
The outer casing BB isprovided in its bottom
with relatively large openings ||| through which
extend drain pipes .i I3. Pipes -| I3 are in com
munication with openings Il! in the bottom of
the inner cylinder composed by the rings 00 and
13.
The means for carrying water from the end
40 and necks 21.
liquid manifold rings 00 to the outlets H5 is as
Within each annular recess formed by the
follows, referring to Figs. 3 and 4. At intervals
rings 1| and 13 is a peripheralLv wound neld coil
along the bottom of the rings 80 and 10 are
11. One coil is shown in Fig. 3 but it will be un
derstood that toward the opposite end of the 20 supporting cross bridge plates ill.“ Each clears
the bottoms by means of an opening H0. Each
machine is another similar coil symmetrically
in effect forms an arch or bridge for accommo
located with respect to a central plane.
dating free liquid ñow beneath it. Each is per
Welded to the top arcuate portionsy (but not
forated to carry axially disposed water tubes |2 |.
the bottom) of the rings 80 and 10 are longi-'
Each tube |2l is axially slotted as at |213 adia
tudinal magnetic teeth 8| and 83. These extend
are suitably welded to form a double-walled
hollow cylindrical rotor unit having the heads
. radially (Fig. 4). As indicated at 35, their ends
extend under the coils 11. 'I'hese teeth are
widely spaced and their ends are tapered down
preferably to provide for approximate ilux satu
cent to the rotor cylinder l1 so as to project a
sheet of water against that cylinder. `Notches
which hold tubes |2| in the plates ||1 allow the
issuing sheet to be continuous throughout the
.
ration from their ends. The toric flux neld gen 30 length of the cylinder I1'.
Axially disposed deilectors' |25 are used above
erated by one of the coils 11 is indicated in Fig. 3
the lower nest of tubes I2| thus formed. A de
by dotted lines. It engenders. for example, a
fiector |21 is also used between groups of five of
series of north poles in the teeth Il within ring
these pipes and located at the bottom of the
03 and a series of opposite south poles in teeth
bridge plates li'l.I These deilectors |25«and |21
33. If desired this polarity may be reversed by
serve also as stiffening members between the
changing the 'direction of current through the
bridged supports Il'l. From Fig. 4 it will be
coils 11. This iiux traverses'the drum I1 which
noted that the bridge supports ||1 are welded
forms the main part of the rotor R. Thus if the
to the inside of the rings 88 and 10.
rotor, which is also magnetic, is caused to rotate.
A. single additional pipe |20 is used axially
eddy currents are engendered therein. and the 40
between the two uppermost groups of teeth 0|
resulting reactive nux neld applies torque to the
and 83, the same being fastened to these by
stator S through the teeth 0| and I0. This
means of welded web plates |3|. This pipe, like
torque is in a proportion to the energy trans
the pipes I2I, is axially slotted adjacent the
formation accomplished by the heating of the
cylinder 01 by the eddy currents.
45 cylinder 01 to project liquid thereon. It is pref~
The cylinder 01 is solid and preferably made
It has a solidv stepped con
nection 30 with the gudgeon il. The gudgeon Il
also has a solid connection with‘the shaft 0| '
which extends from the machine for attachment 50
of generator steel.
of an engine to be tested or for attachment to
another dynamometer unit as will be described.
erable that all of the pipes I2| and |20 be non
magnetic.` such as of brass. so that they do not
act as short circuits for the flux field issuing
from the teeth Il.
All of the pipes I2I and |28 at'opposite ends
of the machine are fastened into header rings
|33 which form suitable inlets for the pipes from
the ring manifolds 9B.
The stepped connection 30 cooperates with a
From the above it is evident that if water un
stepped labyrinth 33 formed on the inside of an
endwise water ring Il. The cooperating steps 00 55 der suitable pressure (which may be low) is in
troduced into the end rings 8l it will progress to
and 03 act as an additional liquid dam.
v
the pipes |2l and |29 and issue in radially di
A header ring 0B is attached at each end of
the inner cylinder 0l formed by the rings Il ' rected, longitudinal sheets against the rotor
cylinder I1. It will be noted however that by far
and 1l. the outer cylinder 05 overlapping 0I end
wise. Each ring 0l includes at the top a pair of 60 the greatest volume of water issues from the ten
pipes at the bottom of the machine against the
water inlets 31 having ilexible connectors Il
under side of the cylinder I1 and that only a
reaching to the opposite end of the machine.
small amount, one-tenth (for example) by com
These sets of nexible connectors l! have con
parison, issues from the other pipe |29 against
nections III with water manifolds |03. The
the upper side of the cylinder. This is an im
manifold at the end of the machine correspond
portant feature of the invention, taken in con
ing to the pedestal 3 is carried on the enclosures
1, l. The manifold |03 carried at the other end ' nection with the use of a'limited number only
of flux-concentrating teeth 0| over the upper
of the machine (Fig. 2) is located upon a bear
arc of said cylinder 01 and in connection with
ing assembly Ill, supported on the pedestal I.
This bearing assembly |30 is similar to the one 70 free drainage facilities. The space below and
between the rotor R and stator S is of'suiiicient
above pedestal 3 and also includes a bearing ro
tating apparatus such as shown in Fig. 5. The
volume to accommodate a pool of coolant without
the rotor dipping therein.
purpose of thus oppositely connecting the mani
The cylinder _01 is heated strongly under the
AVfolds |03 is so that the flexible connections 33
may be as long as possible for maximum flexi 75 teeth 3|, due to the heavy eddy currents en
2,403,421
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gendered therein.
6
5
The heated surface then
quickly sweeps down into a voluminous flood of
coolant (water for example) opposite the lower
pipes |2I. . This large flood of coolant may safely
' be applied because in this region there are no
radially extending teeth which might otherwise
tend to cause churning, unsteady, parasitic, hy
draulic action of the dynamometer. The excess
of coolant descends to the bottom of the hollow
four units of the type above described coupled
in tandem. This tandem coupling allows for a
large increase in speed because capacity is in
creased without undue increase'in diameter of
the cylinders 81. With smaller cylinders such
as 81 higher speeds are better tolerated.
The exterior of the apparatus will now be de
scribed in connection with Figs. 2, 6,1 and 7.
vEach outer case or stator S is provided with
cylinder composed by the rings 89 and 10 -and 10 opposite pads |42 for attachment on one or the
passing underneath the bridge supports ||1,
other side of_a suitable arm for yreaching to
passes to the outlets II5.
weighing apparatus for measuring force at a
On the upper region-„of the cylinder 81, where
the flux-concentrating teeth 8| are located,
known radius for calculating torque. Opposite
The defiectors |25 and |21 tend to> baille the .
Fig. 6 an arm on a pad |42 is diagrammatically '
threaded sockets |43 are also employed for ap
there is very little water applied. This addi 15 plication in one of said sockets of a suitable arm
tional water is only suilicient to prevent excessive
(extending in the opposite direction from theheating in the cylinder 81 under the teeth 8|. Y
arm in pad |42) to support a dead weight. In
streams of water below the cylinder 81 and to
shown in dotted lines at |45 and the weighing
prevent them from progressing upward.
20 scale at |41.
'
Water is carried off from the outlets ||5 to
On the opposite side is shown in dotted lines y
the pipes I I3 into a hollow base |35 of which the
an arm |49 threaded into a socket |43 and sup
platform I is the top. Relatively large open
porting a dead weight I5|. By this means the
ings I31 are applied in the top I movably to
amount of weighing that needs to be done by
accommodate the pipes |I3, and the latter are 25 means of the scale |41 in order to measure a
connected to the top I by fiexìble connectors |39
given torque is reduced by the amount of torque
so as to prevent vapor and thevlike from issuing
supplied by the dead weight I5|. The amount
from the base |35. In the base |35 is a suitable , of the weight I5| of course willbe known, 'and '
coolant sump I4I from which the received hot
its moment plus that applied by the scale |41,
water is pumped to cooling apparatus, or if 30 will give the total moment applied to the case.
desired for recirculation or may be thrown away
In Fig. 2, is shown a cover |53 which is located
to waste. The base also contains whatever aux
over an inspection opening.
iliaries may be required, such as an oil pressure
Coupling means are used between successive
lubricating system etc.
units in tandem as shown in Figs. 6 and '1. Cou
It will be seen from the above that the cylinder
pling is accomplished by providing at each end of
-81, the stepped down portion 89, gudgeon 55 and
a given unit two pairs of pads |55 (see also Fig. 2)
for receiving extension trusses. The trusses on
also favors high rotative speeds in addition to
each side between adjacent units are indicated at
the diameter of the cylinder 81 being kept down
|51 and |59 in Fig. 6. All of the trusses |51 and
las much as possible 4while relying upon length 40 |59 are of general triangular shape, each having
increase for increased capacity. feet |6| for application to one of the pair of pads
' It will be noted also that the stator S is built
|55. Each |51 ends in a tongue |63. Each truss
up by welding from various Cylinders, rings and
|59 ends in a clevis |65. When bolted into posiw
the-like. This provides a substantial amount of
4tion the tongues |63 lie withinthe mouths of
empty space between rings 59, 10, 13 and the 45 the clevises |65. Adjusting bolts |61 in opDO
outer cylinder 65, Hence a rigid double
site sides of the clevises |65 serve properly to
barreled stator structure is obtained accommo
eliminate lost angular motion. The rotor shafts
dating the coil 11 and an ample flux path with
' 9| are connectedby couplings 92, as shown be- »
shaft 9| are all made integral and solid.
This
out increasing the weight of the stator unduly.
tween the units in Fig. 6.
By this means undue flux wandering is also pre 50
It will beobserved that if desired, added dead
vented since it is confined entirely to the inner
barrel 59, 1|, 13, 10. In this respect it is im
portant that the ring 13 be separated from the
outer cylinder 65 by means of an air gap so that
there will not be a loss of fiux from the flux
circuits to outer cylinder 65.
y
The rings 58 and 1|| joined by the rings 1| and
15 form an inner waterproof structure joined to
the outer cylinderv 65 by means of the spacing
rings 31. 'I'his construction provides good rigid
ity without commensurate increase of weight in`
the stator. It also provides recessed spaces for
the coils 11 which needuto be located behind the
lweights such as I5| may be applied to each of
v the units in the series.
More arms such as |45
and scale |41 may also be used. But it is usually
preferable to use one arm and one scale on a more
or less central one of the umts and also to apply
a single arm |49 and single dead weight |5I to
said more or less central unit. Through the
truss couplings all of the torque from al1 units
may be weighed from one.
The break line in Fig. 6 indicates that more units may be inferred to be in the line of two
shown therein.
' .
The endmost unit, which is shown at the right
teeth.8|, 83. The hollow heads 49 with the con
in Fig. 6, may have its shaft provided with a
tained but separate headers 95 favor a light 65 splined slidable crown coupling |59~for engage
construction without sacriñce of strength.
ment and disengagement with a cooperating`
Each unit (one of‘which has been above de
crown coupling |1| on the shaft |13 lof a'motor
scribed) is arranged'to be coupled in co-axial
|15. Theípurpose _of this is to provide means for
tandem with another so thatv a line of units may
turning the rotor for cleaning operations and the
be used together, as shown by Fig. 6. Fig. 6 70 like, independently of any driving engine, or to
shows, for example, two units coupled together
rotate said rotor for other than testing> pur
(one fragmentary). but it will be understood that
poses.V
ì
three, four or more may be coupled for unitary
From the above itfwill be seen that- I have pro
action in tandem. The capacity above quoted,
vided small-diametered dynamometer means
namely, 15,000 H.- P. absorptive capacity is for 75 which _is safe athigh speeds for absorbing large
2,403,421
8
7
ward the rotor and into relatively close proximity
amounts of energy and for accurately measuring
the resulting torque for computing horsepower.
'I'he system employed lends itself to indennita
increase in capacity without increasing rotor
sizes by multiplying the -units used __in tandem.
with the latter to form 'ilux gaps, said poles being `
spaced throughout an arc over only upper por
tions oi' the rotor. a field coil in the stator lor
generating a flux ileld interlinking the stator and
the rotor through said poles, axially located con
duit means between the rotor and the stator hav
It is also reversible. the opposite pads il! and
sockets |43 being for the purpose of properly op
positely applying the weights and scales under
such circumstances. Thus it is particularly
adaptable to a wide range o! cases where dyna
ing openings directed toward the rotor for flood
ing it with a coolant, and means for introducing
10 coolant into said conduit means. the space‘be
mometers are required. In any multiple of units
the action is smooth because of the large reduc
tion in parasitic hydraulic torque which in the
ordinary machine builds up vibrations. Such vi
brations in tandem units would become periodic
and the present means minimizes this contin
gency.
,
-
While the invention is disclosed in connection
tween the rotor and the stator adjacent the con
duit means being of suil‘icient volume to accom
modate a relatively large pool o! coolant.
4. A dynamorneter comprising a rocking stator,
an eddy-current rotor therein, rotary liquid seal
ing meam between and near the ends of the rotor
and the stator, said stator and rotor being sub
stantially radially spaced, axial flux-concentrat
ing polar teeth extending from the stator toward
with a dynamometer application, it will be un
derstood that it is also applicable to similar ap-` 20 the rotor and into close proximity with the iat
ter, said teeth being peripherally spaced through
paratus, such as slip couplings. brakes and the
out an arc only over upper portions o! the rotor,
like.
.
a field coil in the stator for generating a flux
In view of the above, it will be seen that the
held interlinking the stator and the rotor through
several objects o! the invention are achieved and
said teeth, axially located conduit means between
other advantageous results attained.
the rotor and the stator having openings directed
As many changes could be `made in the above
toward the rotor for flooding it with a coolant.
constructions without departing from the scope
means for introducing coolant into said conduit
of the invention, it is` intended that all matter
means, the space between the rotor and the
contained in the above- description or show_n in
the accompanying drawings shall be interpreted
stator adjacent the conduitmeans being of sui
as illustrative and not in a limiting sense.
ticient volume to accommodate a relatively large
I claim:
circulating pool of coolant without the rotor dip
_
l. Apparatus of the class described compris
ing inner and outer relatively rotary members’
ping therein, and at least one axial conduit means
, over the upper arc of the rotor in the space be
` which are substantially radially spaced. flux-con
centrating poles extending from one of the >members toward `theother and into close proximity
tween it and the stator and between said teeth
which pipe is also open toward the rotor for pro
Jecting coolant thereon. the amount of cooling
medium applied to the rotor from said last-named
conduit being substantially less than the volume
spaced throughout an arc over only upper por
tions o! said inner member, a ñeld coil in one of 40 oi cooling medium applied below the rotor from
said mst-named conduit means.
the members adapted to generate a flux held in
5. A dynarnometer comprising a rocking stator.
terlinklng the members through said poles, axial
a rotor within the stator and having rotary liq
conduit means located between said members and
uid end seals with respect thereto, said rotor and
having openings directed against one o! the mem
bers for flooding it with a liquid coolant. means 45 said stator having relatively large radial spac
ing, axially extending magnetic pole means at
for introducing coolant into said conduit means,
tached to the rotor and extending toward only
the space between said members being sumcient
. upper arc portions oi the rotor, ileld means in
to accommodate beneath the inner member a re1
the stator generating a iiux field interlinking
‘ atively large pool of coolant without -the rotor
50 the stator, the rotor and said axial poles, coolant
dripping therein.
l
pipes axially located in the space between the
2. Apparatus of the class described comprising
rotor and the stator, headers in the stator, said
inner and outer relatively rotary members which
pipes having open ends communicating with said
are substantially radially spaced. iiux-concen
headers and having openings along their length
trating poles extending from one of the members
directed toward the rotor for amply flooding it
toward the other and into close proximity with
with coolant, said pipes being located around
the latter, said poles being peripherally spaced
the lower arc of the rotor in radial space suill
throughout an arc over only the upper portion of
cient to form a substantial pool of coolant with
said inner member, a ileld coil in one of the mem
outthe rotor dipping therein.
.
bers adapted to generate a nux neld inter-linking
6. A dynamometer comprising a rocking stator.
the members through said poles. conduit means
a rotor within the stator' and having rotary liq
located between said members and having open
with the latter, said poles being peripherally
ings directed against one of the members for
?oodlng` it with ,a liquid coolant, that portion oi
the conduit ‘means which supplies most of the
coolant being located between said members
throughout an arc under only lower portions of
the inner member. the space between said mem
bere being suiiicient to accommodate beneath the
inner member and in the outer member a rela
tively large pool of coolant without the inner 70
member dipping therein.
3. A dynamometer comprising a rocking stator.
. uid end seals with respect thereto, said rotor and
said stator having relatively large radial spac
ing, axially extending magnetic pole means at
tached to the stator and extending toward only
upper arc portions of the rotor, annular field
means in the stator generating a toric flux ileld
interlinking> the stator. the rotor and said axial
poles, a plurality of coolant pipes axially located
in the space between the'rotor and the stator.
annular headers in the rotor, said pipes having
open ends communicating with said headers and
having openings along Vtheir lengths directed to
an eddy-current rotor therein. said stator and
rotor being substantially radially spaced. nux- - ward the rotor for flooding it with coolant. the
ccncentratingpclcsextendingtromtbestatortc 75 numberotplpesapplyingthegrsatcramountct
2,408,421
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coolant being located under the lower arc of the
rotor, the space between said lower arc of the
rotor and that of the stator being suflicient to
carry a substantial pool .of coolant without the
rotor dipping therein.
.
10
tor with their ends in close proximity to the
rotor, said rotor having endwise portions extend
ing from the stator, endwise coolant seals be
ytween the'stator and the rotor, liquid headers
carried at opposite ends of the rotor, coolant
7. A dynamometer comprising a composite
conduits -extending between communications
rocking stator, said stator consisting of an outer
with said headers and located ~in- the space be
wall and a spaced internal wall, the latter having
tween the stator and the rotor and having cool-_
ant iiooding openings directed toward the lat
axial inwardly directed polar teeth and being
provided with at least one outwardly extending l() ter, the conduits supplying most of the coolant
lying in a peripheral region outside of that of
peripheral recess, an Iannular field coil in said
said polar'teeth and therebelow, and a peripheral
¿ recess, a rotor located within the stator and sub
stantially spaced therefrom radially, said rotor
field co-il supplying a toric iiux ñeld interlinking
having endwise portions extending from the sta
the stator, rotor and polar teeth.
12. A dynamometer comprising a rocking sta
tor, endwise coolant seals between the stator and
tor, said stator consisting of an outer sleeve and
the rotor, annular coolant headers in the vends
a spaced internal compositesleeve, the latter be
of the stator, and coolant pipes extending be
ing provided with at least one outwardly extend
tween .communications wi'th said headers and
through the space between the rotor .and stator.
ing peripheral recess, an annular field coil in said
8. A dynamometer comprising a composite
recess, a rotor located within the stator, said ro
tor having endwise portions extending from the
rocking stator, said stator consisting of an outer
wall and a spaced internal wall, the latter having
stator, endwise seals between the stator and the
axial inwardly directed polar teeth and being pro
rotor, and flux-concentrating teeth extending
vided with‘at least one outwardly extending pe
from the inner sleeve toward the rotor, the ra
ripheral recess, an annular field coil in said re
dial spacing between the rotor and said inner
cess, a rotor located within the stator and sub
sleeve being substantial, axially located pipes be
stantially spaced therefrom radially, said rotor ~ tween the inner sleeve and the rotor having
having endwise portions extending from the sta
openings for impinging coolant against the rotor,
tor, endwise coolant seals between the stator and
said stator having at least one hollow annular
the rotor, annular coolant headers in the ends 30 header with which said pipes communicate for
receiving coolant.
of the stator, and coolant pipes extending be
tween communications with said headers and
13. A dynamometer comprising a rocking sta
through the space between the rotor and stator,
tor, a rotor vlocated within the stator, said rotor
said polar teeth extending into cio-se proximity
having endwise portions extending from the sta
to the rotor surface.
`
tor, endwise seals between the stator and the ro
9. A dynamometer comprising a composite
tor, flux-concentrating polar teeth extending
rocking stator, said stator consisting of an outer
from the inner sleeve toward the rotor, an an
wall and a spaced internal wall, the latter hav
nular field coil providing a flux ñeld interlinking
ing axial inwardly directed polar teeth and be
the rotor, stator and polar teeth, the radial spac
ing provided with at least one outwardly extend 40 ing between the rotor and said inner sleeve being
ing peripheralV recess, an annular field coil in
substantial, axially located pipes between the in
said recess, a rotor located within the stator and
ner sleeve and the rotor having openings for im
substantially spaced therefrom radially said ro
pinging coolant against the rotor, said stator
tor having endwise portions extending from the
having hollow annular endwise headers for cool
stator, endwise coolant seals between the stator
ant with which said pipes communicate, flexible
and the rotor, annular coolant headers in the
feed lines connected to `said headers respective
ends of the stator, and coolant pipes extending
ly and extending above the stator in opposite di
between communications with said headers and
rections, each feed line receiving its coolant from
through the space between the rotor and stator,
a point at the end of the rotor which is opposite
said polar teeth extending into close proximity 50 to the end at which the feed line is connected to
to the rotor surface, most of the pipes lying in ` its respective header.
a peripheral region outside of that of the teeth
14. A dynamometer comprising a rocking sta
and therebelow.
'
tor having inwardly directed polar teeth, a ro
10. A dynamometer comprising a rocking sta
tor within the stator and substantially spaced
-tor having inwardly directed polar teeth, _a rotor
therefrom radially, said teeth extending from the
within the stator and substantially spaced there
stator with their ends in close proximity to the
from radially, said teeth extending from the sta
rotor, said rotor having endwise portions extend
tor with their ends in close proximity to the ro
ing from the stator, endwise coolant seals be
tor, said rotor having endwise portions extend
tween the stator and the rotor, liquid headers
ing from the stator, coolant seals between the 80 carried at opposite ends of the rotor, a plurality
stator and the rotor, liquid headers carried by
of coolant pipes extending between communica
the stator, coolant conduits extending between
tions with said headers and located in the space
communications with said headers and located
between the stator and the rotor and having
in the space betweenvthe stator and the rotor
coolant flooding openings directed toward the
and having coolant flooding openings directed 65 latter, the pipes supplying most of _the coolant
toward the latter, the conduits which supply most
lying in a peripheral region outside of that of
of the coolant lying in a peripheral region out
said polar teeth and therebelow, and a peripheral
side of that of said polar teeth and therebelow,
-ileld coil supplying a torio flux field interlinking
and a peripheral field coil supplying a toric flux
the stator, rotor and polarteeth.
field interlinking the stator, rotor and polar 70
15. A dynamoineter comprising bearing ped
estals, a hollow stator mounted to rock in said
11. A dynamometer comprising a rocking sta
pedestals, a rotor having bearings in the stator
tor having inwardly directed polar teeth, a rotor
and having end portions extending therefrom,
within the stator and substantially spaced there
coolant-receiving means at opposite ends of said
>`from radially, said teeth extending from the sta 75 stator, separate flexible coolant supply pipes at
teeth.
,
'
1l
moan:
tached to said coolant-receiving means vrespec
12
K volume being distributed adjacent the lower arc
tively, coolant-supply headers mounted upon said
of therotor, and flux-concentrating poles pro
pedestals, each ilexible coolant supply pipe which
jecting from the inside of the stator into close
proximity with respect to the rotor over upper
larcuate portions thereof, and at least one annu
lar field coil carried by the rotor and supplying
a ilux circuit through the rotor, poles and stator.
18. Apparatus of the class described compris
ing inner and outer relatively rotary members
vwhichA are substantially radially spaced, iiux
concentrating poles extending from one oi the
members toward the other and into close prox
is connected to one receiving means communi
eating with the header on the pedestal which is
at the opposite end of the stator.
16. A dynamometer comprising a stator, an
annular field coil in the stator, a rotor within
the stator passing through said coil, said stator
and rotor being amply spaced radially, flux-con
’ centrating teeth in the ilux circuit oi' said coil
and extending from the stator and into close
proximity to the rotor surface at upper arcuate
imity with the latter, a field coil in
members .adapted to generate a iiux
portions of the latter, endwise coolant .headers
in the stator, coolant pipes connecting said head 15 linking the members through said
poles being peripherally spaced with
ers, said pipes having coolant openings adjacent
the rotor and at its lower arcuate portions for
one of the
field inter
poles, said
a majority
of them located in a predetermined upper arc be
tween the adjacent peripheries of the rotary
projecting coolant against the rotor, said pipes
members, - thereby leaving in the remaining arc be
being in the space between the rotor and the
stator and connecting said headers, and supports 20 tween said adjacent peripheries a space which is
for the pipes at intervals along 'the stator but
less obstructed by poles than is the space in said
bridging its bottom portion to allow for a sub'
upper arc, means for spraying coolant onto the in
ner rotary member primarily from said relative
stantial pool of coolant, said stator having bot
tom outlet means from the pool of coolant.
ly unobstructed space, said outer member hav
17. A dynamometer~ comprising a hollow cy 25 ing coolant outlet means from said relatively un
lindric stator, a cylindric rotor therein and-am
obstructed space which -will let out coolant from
phr spaced therefrom radially, annular coolant
the outer member, the arrangement being such
that no pool of coolant in said relatively unob
headers at the ends o! the stator, coolant pipes
connecting said headers and having coolant pro
structed space touches the rotor.
Jection openings directed toward the stator, the
number oi' pipes carrying the greatest coolant
MARTIN P.
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