Note: Descriptions are shown in the official language in which they were submitted.
CA 02215790 1999-12-O1
PLATE FOR ELECTRODYNAMIC MACHINES
This invention relates to a disc for the magnetic circuit
of an electrodynamic motor.
Such discs arE~ for example disclosed in the Japanese
Patent Application 5-236682 and are used for
manufacturing a plate packet for electrodynamic motors
constructed from a plurality of annular sheet metal
discs. In the known case the openings are disposed in
the region of the radial ends of the legs and are
enclosed by means o:f an enclosed right with projections.
This has the disadvantage that the rings occupy
additional space and on the other hand must be separately
connected with each disc. A similar situation obtains
with discs as described in US-A-5 187 858. Therein is
disclosed a stator packet for electrodynamic motors whose
openings are c:entra:Lly formed and are enclosed by means
of a cylinder,. Rad:ially, the winding grooves have
openings for t:he magnetic flux. In this way the magnetic
flux is clear7_y improved.
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, CA 02215790 1999-12-O1
Proceeding from the above prior art, the object
underlying th<~ invention is to provide assistance here.
Therefore, this invention seeks to provide a disk for the
magnetic circuit of an electrodynamic motor, comprising:
(i) a central opening having a diameter,
(ii) a plurality of legs extending radially from
said central opening and being peripherally spaced
from each other,
(iii) even alternate ones of said legs each formed
with outE:r arms, said arms peripherally extending in
opposite direcl~ions from each other,
(iv) odd alternate ones of said legs each having a
radially outer free end,
(v) each of said outer arms having a peripheral
free end for forming a slot between the peripheral
fee end and an adjacent radially outer free end
adjacent to alternate ones of said peripheral free
ends,
(vi) a winding groove disposed between each leg,
each of ~>aid winding grooves being accessible from
the outside through said slot, and
(vii) (a) the radially outer free ends each of
said odd alternate legs having groove dividing said
free end into two radially outward extending parts
for bending each such outward extending part toward
an adjacent end of said peripheral free end of an
adjacent outer arm for closing the slot, or
(b) the peripherally free ends of each
leg being bendable toward an adjacent radially outer
free end for closing the slot.
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CA 02215790 1999-12-O1
It is recognised that the invention is achieved when a
disc is involved in which the openings for winding are
disposed asymmetrically with respect to the winding
grooves, and are foamed in the region of the free ends of
the radially aligned legs. The respectively peripherally
extending leg or th~~ radially extending arm in this case
are made of flexible material, e.g. steel, and after
winding of the stator packet may be bent so that the
grooves are c7_osed. Thus rings are unnecessary. In
addition, the external dimensions of the stator are
reduced at least by the radial thickness of the ring.
The ends of tree arms facing one another and of the legs
may in addition be connected e.g. by welding or
soldering.
Consequently, a substantial advantage of the measures
proposed consi.stS 1T1 the reduction of individual parts,
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CA 02215790 1997-09-18
ntinimi.sation of the external dimensions of the stator packet
and a s~.mpler assembly and winding of said stator packet.
For ofter formation of the statoz packet the winding grooves
are preferably clad with insulating maternal, ~.n one single
process step. The stator packet is then automatically wound
az~d f~.naily the Openings for w~.nding are closed by bending
the legs and/or the arms. zf necessary, the ends facing
one another of the ends and of the arms rnay be rigidly
connected tc~gethez~, e.g. by welding, soldering, gluing or
the like. This procedure is technically much easier to
realise than it is to provide the stator packet with a
common zing oz' separate rings by means of which the openings
are conventionally closed. During cladding of the Winding
grooves, simultaneously hollow shafts disposed axially on
1S the ends may be injectzan moulded on, by means of which
winding is simplified. For such purposes insulating
matexial is regularly used which hardens after the injection
procefis, but does not appreciab~.y influence the magnetic
flux. Finally, in order to improve the magnetic flux, the
2s central opening of the discs may be enlarged in such a way
that no further metallic barrier exists between the opting
and the respective winding grooves, which could impair the
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CA 02215790 1997-09-18
magnetic flti~c. zn this case mutually adjacent segments are
Field together by the insulation maternal. After winding,
t:he user obtains a wound stator packet z~eady for use, all
manufacturirxg stages, starting with stamping of the discs
and terminat~.ng with enlargemeizt of the internal diameter of
t:he opening, being capable of being carried out
automatically.
I'v'urther appropriate and advantageous developmezzts of the
~ Zo invention. will become apparent from the sub-claims.
Tn a particularly appropriate development, the arms and/or
t-he legs are made of flexible materials. By means of these
measures, the winding grooves of the discs, Combined to
z5 form a packet, may He entirely enclosed e.g. by welding. A
disc is obtained in which the winding grooves are closed and
'thus the rigidity of the disc considerably increased.
zn a further appropriate development of the invention, the
20, openings are in the form of radially extending slots,
enabling s;_m=le winding of the discs. Furthermore, the
radially~~aligned legs are slotted in their inner area. Hy
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CA 02215790 1997-09-18
tthese measures, contacting of the ends .acing one another of
the legs and of the arms may be simply achieved. zn a
further appropriate development, the peripherally extending
.arms have predetermined bending points. These measures also
enable a rapid connection between the terminal parts of the
legs and arms.
In a particularly appropriate development of the invention,
the peripherally extending arms each comprise two legs,
i0 between which is respectively fbrmed a slot, the outer leg
being bendable towards the inner leg, closing the opening.
Thus it is appropriate if the slot tapers in an inward
direction_ Tntithin the scope of this inventive idea, it is
particularly advantageous if predetermined bending points
are formed for the outer legs in the region of connection of
the legs; and if, in the bent condition of the outer legs,
said outer legs may be positively connectable together both
with the inner legs and with the radially aligned legs,
which taper towards their free ends, forming a duct for a
weld seam. This measure means that the shape of the winding
groove is not changed, not even when tale outer legs. have
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CA 02215790 1997-09-18
been bent_ Therefore damage to the winamg wires cannot
occur_
In another appropriate development o~ the invention, the
winding gi:ooves axe coated with. insulating material, said
winding grooves merging into grooves filled with insulating
material on the radial side, and which extend as far as the
opening. These measures achieve an electrically contact-
free connection between the winding wire and the dlsc_ zn a
,'
z0 particul~~ly appropriate development of the invention, the
grooves tilled with insulating material respectively
operationally connecC to adjacent segments. By means of
this measure the magnetic flux flows from the winding
grooves into the opening unhindered_
The invention also relates to a method of manufacturing such
discs. zn this case the procedure is such that firstly a
disc blanx is produced with winding grooves and if necessary
grooves. Thereupon the discs are Combined to form a stator
plate packet and the winding grooves and grooves are covered
or f~.lled with suitable insulating material and wound. The
diameter of the central opening is also enlarged so that the
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CA 02215790 1997-09-18
annular ureb nolding the segments togettmr is eliminated,
and the grooves covered with insulating material. which are
~areferably rectangular in cross-section, extend as far as
the opening. Finally, the ends facing one another of the
S arms and of the legs are connected by being bent together.
Some embodiments of the invention given by way of eacample
are shown diagrammatically in the drawing and will be
explained in more detail in the following. Shown are:
I. 0
Figure 1= a disc blank;
Figure 2: the disc shown in Figure 2 with winding grooves
covered with ~.nsulating mate_r~.al;
~. 5
Figure 3: the disc shown in Figuz'e 2 with wound winding
grooves;
Figure 4: the disc shown in Figure 3, the ands facing one
20 another of the legs and aims be~.ng disposed
relative to one another without spacing;
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CA 02215790 1997-09-18
Figure S: the disc shown a.n Figure ~, ~:he arms and legs i.n
coritact being connected by welding;
F~guxe 6: the disc shown in Figure 5, in which the central
opening has been enlarged to a radius r2;
Figure 7. a further disc;
Figure 8: the disc shown in Figure ~ with bent arms;
Figure 9. a detai.7. of a disc shown on an enlarged sCa~.e;
Figure 10: a stator p7.ate packet comprising disC$ as shown
in Figure T;
x5
3?figure 11: the stator packet shown in Figure 1.0 with winding
grooves covered and shafts moulded on;
Figure 12: an elevation in the direction of arrow xII
according to Figuxe 11;
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CA 02215790 1997-09-18
Figuxe 13:. an axial section through the stator packet
according to Figure 11;
Figure 14.°. a perspective view of a further stator plate
packet;
Figure 7.5~ an elevation in the direction of the arrow XV
according to Figure 14;
i
Figure ~.~: the part identified by XVZ according to Figure
1S, shown on an enlarged scale, and
Figure 17: the portion identified by XVII according to
Figure 15 shown on an enlarged scale.
Where is seen in Figure 1, in conjunction with Figure 9, a
disc z0 for the neagnetic circuit of an electrodynamic motor_
In this case there are pz-bvxded a~centraZ opening 1Z and
segments-~L4, 16 disposed around this opening and connected
together by non-magnetic or eleCtricaliy non-conductive
material_ The segments 14, 16 are provided with radia.lly-
aligned legs 18, 20, if necessary having peripherally
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CA 02215790 1997-09-18
extendirxg arms 22, 24, said legs 18, 2U defining wi~xding
grooves 30 with openings.3z which are accessible radially
f°rom the exterior_ The openings 32 are formed in the region
raf 'the free radial ends of the legs 20. The arms 22, 24 and
the legs ~8, 20 are formed from flexible material. The
width d1 of the opening 32 is greater than the thic3cness of
~:he winding wire, which is not shown in further detail. It
will further be seen that the openings 32 are in the form of
radially-extending slots, so that the winding wire can be
IO passed along the inner wall 37. of the winding groove 30_
The radially-aligned legs 20 are slot>ned in their terminal
region and may be bent aver without difficulty. zn front of
the winding, the winding grooves 30 are covered with
insulating material 44, as Figwxe 2 shows for example. It
mill fuxther be seen that the winding grooves 30 merge into
radial grooves 46 filled with insulating material 44, and
which initially have a spacing d2 from the central opening
12. At this stage the opening 12 of the disc s0 has an
internal diameter r1. After winding and closure of the
;slots, this internal diameter rl is enlarged, to a value r2
(see Figure 6), so that the grooves 46 filled with
insulating material connect the winding grooves 30 with the
CA 02215790 1997-09-18
. , , , ,
central operr~ng 12. This ensures thatwhe magnetic flux in
an inward direction into the central opening 12 is
guaranteed.
Figures 7 and 8 show a disc whose arms have predetermined
bending points 40 and, after winding of the discs, are bent
towards the free ends of the legs 20. These discs are
,tamped parts, in which the segments 14, z6 are alternately
'.r-shaped and tooth-shaped with slots 1G-0. The portions ~.6-
r.
1.0 1 and 16-2 flanking the slot 1.6-0 can be bent to the free
ends of the arms 24 after winding of the wxnd~.ng grooves 30,
and may be connected thereto for example by welding.
Figures z.4 to 17 show a stator plate packet or a disc of the
~~aclcet, the particular feature of this disc being that the
~~eripher~:lZy extending arms 22, 24 respectively comprise ttnto
legs 22.x., 22.2 or 24.1, 24_2, between which there is f4rmed
a slot 22.3 or 24.3, and the outer .leg 22.1 or 24.1 may be
bent towards the inner leg 22.2 or 24.2 (see 8igure ~-7).
'The opening 32 is thus closed. The slot 22.3 or 24_3 tapers
in an inward direction i.n such a. way that, in the area of
connection of the legs 22_1, 22.2. or 24.1, 24.2,
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CA 02215790 1997-09-18
predetermined bending points 1 of the outer Legs 22.1 and
24_1 are formed. In the bent condition of the outer legs
22.2, 24,.x., the outer legs 22.7. and 24.1 together with the
inner lecfis 22_2, 24_2 and also the legs 20, which taper
'S towards their free ends, may be connected positively
together forming a duct 1_z for a welding groove. The
advantagf_ of this embodiment resides in the fact that the
winding grooves 30 covered with insulating ma,ter~.a3. are not
deformed by bending of the outer legs 22.1, 2~.1, as the
shape of the winding grooves is constant and the inner legs
22.2, 24.2 are not bent, and this enSUreS that the
insulating material is not removed from the inner wall of
the Winding groove 30.
Figures 16 and 17 show that the sides 20.1 and 22.5 facing
one another in the bent condition of the outer legs may be
positively connected tagethex. Thus the end side 22.6 of
the head 22.4 closes the actual open~.ng 32 of the winding
groove 30. After winding of the stator packet and bending
of the legs 22.1 and 24.1, these legs i~ necessary can be
welded a.n the regi.ori of the duct z.i_ Due to the special
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CA 02215790 1997-09-18
design oil this disc, manufacture of the stator packet is
particularly simp3.e and its winding is problem-free.
The following is the procedure for manufacture of the
proposed discs:
Firstly a disc blank iFigure Z) with winding grooves and a
central opening 12 whose radius rl is such that a web i1 is
formed b~stween the central opening 12 and the grooves 46, is
manufactured for examp7.e by stamping.
Thereupon a plurality of discs are combined to form a pacxet
(Figure 10) and the winding grooves 30 are covered with
plastic. Simultaneously the two hollow cylindrical shafts 6
disposed axially at the ends are moulded on, simplifying
securing of the packet during winding. Then the radially
inward webs can be removed by cutting, machining or
turning. Such a disc plate packet is then wound, and
f~.nally the openings 32 are closed by bendzng the legs 18,
20 and/or the arms 22, 24. Thus there is obtained a compact
unit which requires no reinforcing rings or additional
parts. In the case of larger stators it may be appropriate
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CA 02215790 1997-09-18
, . ., ,, , , , ,
rigidly to interconnect the legs and airriis in contact with
one anothex e.g. by welding, soldering or gluing_
t
15
2 t)
14
TQTRL P.15
