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Патент USA US3056068

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Sept. 25, 1962
J. HENRY_BAUDOT
ELECTRICAL ROTATING MACHINES
Filed Sept. 15, 1958
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3,056,058
United States Patent Office
1
3,056,058
Patented Sept. 25, 1962
2
3,056,058
ELECTRICAL RGTATING MACHINES
FIG. 3 shows a lateral view in cross section, and FIG. 4
shows a corresponding front view of a rotor member
Jacques Henry-Baudot, Antony, France, assignor, by
embodying certain features of the invention.
mesne assignments, to Printed Motors, Inc., New York,
N.Y.
Both arrangements are only examples of stator and rotor
members of a machine illustrating the invention. Alterna
tive shapes remain within the scope and spirit of the
Filed Sept. 15, 1958, Ser. No. 760,907
Claims priority, application France Mar. 28, 1958
9 Claims. (Cl. 310-268)
invention.
In FIGS. 1 and 2, a toroidal or tubular permanent mag
The present invention is a continuation in part of my 10 net is shown at 116. As stated above it is magnetized
along its axis of rotation. For instance, the end facing
the air-gap presents the N pole, and the opposite end, the
S pole.
co-pending application Serial No. 691,434 and concerns
improvements in the arrangement of DC. motors, A.C.
generators and rotary converters including a stator mem
ber consisting of a plurality of magnetic pole-pieces dis
Annular magnet 116 is connected at one end to a plate
tributed over a substantially ?at ring and of a ?at rotor 15 118 forming a yoke and provided with a cylindrical ?ange
119 carrying inwardly directed pole pieces 1172 in a plane
aligned with polar pieces 1171 cut in another plate 120
consisting of a winding of printed conductors spread out
over the two faces of a thin dielectric or magnetic sup
porting disc.
forming a yoke for the other pole of the magnet 116.
Pole pieces 1171 and 1172, as shown in FIG. 2, are so
The above mentioned co-pending application provides
for electrical rotating machines having a plurality of poles 20 cut as to interleaf regularly in the plane of the ring formed
and efficiently operating even at relatively low speeds and
by them in front of the air-gap. Furthermore, they are
at relatively low power because of the reduced volume
and fair cooling characteristic of the structure.
It is therefore a broad object of the present invention
to further improve the stator ?eld structure and the rotor 25
of such rotating machines improving their efficiency for
very low powers, and providing rotating parts of very
small inertia.
so designed as to provide substantially radial edges. The
annular surface de?ned by the outer faces of pole pieces
1171 and 11172 de?nes the useful area of the air-gap of the
rotating machine. This air-gap is formed between the ring
of stator poles and the armature disc 12 which may be mag
netic and which carries the armature winding on its inner
face.
More speci?cally, the inductor of the co-pending appli
As shown in FIGURE 4, and as more fully disclosed in
cation had as many permanent magnets as there were mag
30 my copending application, the armature winding is
netic poles in the machine, and these magnets were dis—
tributed around a discoidal magnetic yoke, each magnet
“printed” on both faces of a thin dielectric sheet 112, one
half of each turn being formed on one face of the sheet
ending in a pole piece facing the annular air-gap of the
and the other half on the opposite face. Each half-turn
comprises a middle portion 13, which is formed substan—
The present invention provides an improved ?eld struc 35 tially radially of disc 112, and two end-portions 14 and 15
ture in which the two sets of pole pieces of opposite po
which are slanted or inclined to portion 13 and which
larity are magnetized from a single source of magnetizing
form the end-connections between conductors on opposite
?ux.
faces of the disc. A single turn of the winding is repre
sented in FIGURE 4.
A more speci?c object of the invention is to provide pole
pieces for the inductor or stator member in the form of 40
In FIGS. 3 and 4, annular disc 12, schematically indi
portions cut in plates of magnetic material which form
cated, supporting the winding of the rotor, is of same in
separate yokes for the respective poles of a single source
ternal and external diameters as the yoke members 17
forming the ring of pole pieces (indicated in FIGS. 1 and
2 at 1171, 1172) of the inductor member, while magnetic
45 ring 18 of FIGURE 3 serves to close the magnetic ?ux
with the axis of the rotor.
lines on the other side of the rotor, that is, ring 18 provides
a return path for ?ux passing from one pole to adjacent
The rotor armature of the earlier application included a
pole.
winding of the series-wave type distributed over the two
faces of a thin supporting disc, the outer
The diameter of supporting disc 12 is then reduced to
of which supported conductor parts forming the end-con— 50 the strictly useful diameter. As shown in FIGURE 4,
nections of the winding turns.
the radial width of annular disc 12 is co-extensive with the
machine.
‘
straight portion 13 of an armature conductor.
On the other hand, as apparent from FIG. 4, the outer
end-connections of the winding turns formed of conductor
55 portions 14 are located on an outer peripheral annular por
On the other hand, the annular portion of the disc
covered by these end-connections contributed to the over
all inertia of the rotating part of the machine.
It is a further object of the invention to form at least
the outer end-connections of the winding turns over a thin 60
dielectric ring arranged outside the air-gap proper while
the rigid rotor disc supports
tion of dielectric sheet 112, which portion extends out of
the air-gap and contributes substantially no inertia to the
overall inertia of the rotor.
In the embodiment illustrated, the entire winding is
shown to be “printed” over both faces of sheet 112 which
consists for instance of the type of material commercially
known as “Mylar” of a thickness of the order of four
hundredths mm., a thickness which has been found su?‘i~
cient to make the completed winding-mylar unit stand by
65 itself. During the rotation of the machine of course the
These and other objects of the invention will be more
fully explained with reference to the accompanying
drawings.
self-supporting character of this unit will be enhanced on
the free annular portion bearing the outer end-connections
of the winding turns.
Member 12 is “glued” to the face of disc 112 with any
FIG. 1 shows a lateral view in cross section, and FIG. 2
shows a corresponding front view of an inductor member 70 suitable thermosetting plastic glue. Disc 112 itself is made
embodying certain features of the invention.
of rigid material such as hard plastic or a glasslike
substance.
‘3,056,058
3
I claim:
1. A ?eld structure for a multi-pole dynamo-electric
machine of the axial air-gap type comprising a series of
magnetic pole pieces equally spaced about a circular path
and connected together by a magnetic yoke, a second series
of magnetic pole pieces spaced about said circular path
within the spaces between the poles of said ?rst series of
4
on opposite faces of a thin disc of dielectric material, each
half-turn conductor comprising a substantially radially ex
tending mid-portion and integral slanted end portions at
the ends of which face~to-face interconnections are made
to conductors on the opposite face of the dielectric disc,
said winding member being af?xed to the said supporting
disc of magnetic material.
pole pieces and being connected together by a second mag
7. A motor according to claim 5 wherein said magnetic
disc has an outer diameter substantially equal to the outer
netic yoke, the poles of both series having ?at pole
diameter of said annular pole area, and the other ends of
faces lying in a common radial plane and de?ning a ?at 10 the conductor mid portions are located on a circle of
annular pole area, and means for magnetizing said mag
diameter substantially equal to the diameter of said mag
netic yokes in opposite polarity from a common source of
netic disc, said dielectric disc having an outer peripheral
magnetic flux.
portion extending beyond said magnetic disc and carrying
2. A ?eld structure according to claim 1 wherein one of
the slanted outer end portions of said conductors‘ which
said yokes comprises a disc having outwardly extending
form end»connections for the turns of said winding.
radial projections forming one series of said pole pieces,
8. A motor according to claim 4 wherein said magnetic
and the other yoke comprises a second disc mounted in
plate is stationary and said armature winding is carried by
spaced parallel relation with, and on a common axis with,
a rotary disc mounted within said air-gap.
said ?rst disc, the second series of pole pieces being sup
9. A ?eld structure for a multi-pole dynamo-electric
[ported from the periphery of said second disc but in off-set 20 machine of the axial air-gap type comprising a series of
relation thereto, and said magnetizing means comprises a
magnetic pole pieces equally spaced about a circular path
cylindrical magnetizing member polarized along its length
and connected together by a magnetic yoke, a second series
and inter-connecting said discs at their centers.
of ‘magnetic pole pieces spaced about said circular path
3. A field structure according to claim 1 wherein one
within the spaces between the poles of said ?rst series of
25
of said yokes comprises a ?at disc of magnetic material
pole pieces and being connected together by a second
having radially extending projections forming one series of
magnetic yoke, the poles of both series having ?at pole
said pole pieces, and the second yoke comprises a ring of
faces lying in a common radial plane and de?ning a ?at
magnetic material surrounding the radial projections on
annular pole area, means for magnetizing said magnetic
said disc and having inwardly directed radial projections
yokes in opposite polarity from a common source of mag
30
forming the second series of pole pieces.
netic flux, and a plate of magnetic material arranged in
4. An electric motor having a ?eld structure according
to claim 1 and including a plate of magnetic material ar
ranged in front of said annular pole area to provide a nar
front of said annular pole area to provide a narrow air
row air-gap between said pole pieces and said plate, and a
disc-type of armature winding mounted within said air-gap
and'being rotatable about the axis of said pole area.
5'. A motor according to claim 4, wherein said magnetic
plate comprises a disc mounted for rotation about the
axis of said pole area and said winding is carried by said
References Cited in the ?le of’ this patent
disc.
6. Combination according to claim 5, wherein the said
winding is made of two sets of half-turn conductors formed
gap between said pole pieces and said plate.
UNITED STATES PATENTS
40
2,508,524
2,579,318
2,740,110
2,773,239
Lang ________________ .._ May 23,
Hershberger __________ __ Dec. 18,
Trimble ______________ __ Mar. 27,
Parker ________________ __ Dec. 4,
1950
1951
1956
1956
UNITED STATES PATENT OFFICE
CERTIFICATE OF CORRECTION
Patent No. 3,056,058
September 25, 1962
Jacques Henry-Baudot
It is hereby certified that error appears in the above numbered pat
ent requiring correction and that the said Letters Patent should read as
corrected below.
Column 2, line 47, before "adjacent" insert —— an -—;
column 4, line 10, for "other" read —- outer ——.
Signed and sealed this 5th day of February 1963.
(SEAL)
Attest:
ERNEST w. SWIDER
DAVID L- LADD
Atteuing Officer
Commissioner of Patents
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