EP3403314A1

EP3403314A1 - Stator for an axial flow machine with a stator ring composed of modules

Info

Publication number: EP3403314A1
Application number: EP17702416.3A
Authority: EP
Inventors: Vasile MIHAILA; Serghei SAVIN; Huguette TIEGNA; Vincent PLOIX; Romain RAVAUD
Original assignee: Whylot SAS
Current assignee: Whylot SAS
Priority date: 2016-01-14
Filing date: 2017-01-06
Publication date: 2018-11-21
Also published as: WO2017121941A1; US20190013707A1; FR3046888B1; CA3011515A1; FR3046888A1; JP2019519181A; US10971959B2; CN108432089A; CN108432089B

Abstract

The present invention relates to a stator for an electromagnetic axial flow machine, the stator forming a ring (1) having two substantially circular faces (1a, 1b) connected via a thickness comprising windings (3) uniformly distributed in the ring (1). Each winding (3) is carried by a unitary portion (4) having a core (5) about which the winding (3) is wound. The unitary portions (4) are arranged concentrically, edge to edge, and have means (12, 12a, 14) for rigidly connecting same with a support member (6) optionally forming part of a housing accommodating the ring (1), which means are carried either by axial and lateral faces of each edge-to-edge unitary portion (4) or by at least one top or bottom face of each unitary portion forming part of a substantially circular face.

Description

"Stator for axial flow electromagnetic machine with unitary portions forming a stator ring"

The present invention relates to a stator for an axial flow electromagnetic machine with unitary portions forming a stator ring. The invention also relates to an axial flow electromagnetic machine and a method of mounting such a stator.

An electromagnetic machine comprises at least one stator and at least one rotor, an air gap separating these two elements. The rotor carries at least one permanent magnet, advantageously a series of permanent magnets, while at least one series of winding elements is carried by the stator.

Conventionally, each of the winding elements comprises a core or a tooth bearing a coil, the core being framed on each of its sides by a notch, a wire good conductor of electricity being wound around the core to form the coil .

When the series or series of windings are electrically powered, the rotor which is secured to the output shaft of the motor is subjected to a torque resulting from the magnetic field, the magnetic flux created being an axial flow for an axial flow electric machine .

The demand for electrical machines that can deliver high power while maintaining a reduced weight and bulk is currently very strong.

Moreover, in industrial applications, the reduction of the mass and the size of the motor for an optimal yield, the reduction of the relaxation torque and the variation of the total torque are criteria as important as the ease of realization, the mass production and the gain in manufacturing time.

The document EP-A2-1624555 representing the state of the art closest, describes a stator for an electromagnetic machine with axial flow, the stator forming a ring having two substantially circular opposite faces, the stator being composed of several unitary portions. defining the two substantially circular opposite faces, each unit portion having a core around which the winding is wound, the portions units forming at least partially the ring being arranged relative to each other concentrically.

The support member has notches each surrounding a portion of the periphery of a unit portion. The notches are separated by a wall. It follows that the unitary portions can not be put side by side and that there is always an interval between them. This does not make it possible to obtain a compact stator.

US-A-2010/275260 discloses a stator with coils each forming a unit portion. The unitary portions have on their upper face a securing means with a support member. The windings are fixed on seats that separate them from each other and prevent their approximation. These seats also have the disadvantage of increasing the price of the stator by the presence of auxiliary parts as well as the weight of the stator.

The problem underlying the present invention is to design a stator for an axial flow electromagnetic machine that is simple to mount by being easily adaptable while allowing the stator to maintain a compact shape while keeping a small distance between the coils.

For this purpose, according to the invention, a stator is provided for an electromagnetic machine with axial flow, the stator forming a ring having two substantially circular faces, the stator being composed of several unitary portions defining the two substantially circular opposite sides, each portion unitary unit having a core around which the coil is wound, the unitary portions forming at least partially the ring being arranged relative to each other concentrically, characterized in that the unitary portions continuously define the two substantially circular opposite faces by being arranged concentrically edge-to-edge to each other and each have securing means, with a support member forming part or not of a housing housing the ring, carried by axial faces and side of each unit portion edge to edge with a unitary portion adjacent, or ground means idarization with said support member carried by at least one upper or lower face of each unit portion forming part of a substantially circular face. The faces are said to be substantially circular because these faces can carry fastening means that can protrude axially while keeping most of the planar and circular face, the securing means occupying only a limited space on the circular face which is associated.

When the unit portions are placed end to end, this means that the unit portions are disposed adjacent while forming a ring-shaped configuration, the adjacent edges of the unit portions extending radially. There remains between the outermost portions of outwardly adjacent unit portions just enough clearance for assembly. There is therefore a saving of space compared to the state of the art closest to which the unit portions are distant from each other. The stator thus produced is compact, compact and light weight.

The technical effect obtained is a simplicity of assembly. The unit portions can be manufactured long before mounting in the stator at another mounting station and are easily individually mounted in the stator. When a winding is deficient, its associated unit portion can also be removed from the stator easily, especially when each unit portion is releasably secured in the stator. It is no longer necessary to wind the coils on a core already positioned on the stator, which provides more room for winding the winding on a unit portion separate from the others than around a core already positioned on the stator.

The technical effect is also a great adaptability of the stator. It is for example possible to change the series of windings of the ring by another series of windings without performing unwinding of the windings but replacing the unitary portions of the stator ring by unitary portions carrying another type of winding. These unit portions may be of different size, only the fastening means remaining the same.

The stator according to the present invention may therefore comprise unitary portions made in series independently of the ring and comprising means of joining together to improve the process. industrialization of the stator assembly to reduce the time and cost of production.

Advantageously, each unitary portion has a body or tooth formed by an assembly of sheets placed against each other radially to the ring. This characteristic is very advantageous since it makes it possible to easily manufacture each unit portion.

Advantageously, the support member is an integral part of the housing or is an integral insert of the housing. Such an assembly is therefore more resistant with elements integral with each other and connected to the housing or in one piece with the housing.

Advantageously, between two cores of adjacent unit portions, there remains a free space forming a notch and, where appropriate, an isthmus formed by the edges located on the side intended to form an air gap on a first circular face of the crown, the edges of each portion. unitary of a second face of the ring opposite to the first circular face, a first form in lateral projection being between the edges of the first and second faces of each lateral side of a unitary portion, the adjacent unitary portions being disposed at edge at least by their first forms in lateral projection.

This notch allows to slightly space the windings from each other. The first side-projecting shapes of two unitary portions make contact between these two unitary portions and assist in positioning the unit portions against each other. These first protruding shapes may be part of the lateral securing means unit portions individually relative to the stator housing, as will be further specified.

Advantageously, the securing means are removable or permanent, the removable securing means being made by screwing or latching elements between the adjacent unit portions and the permanent joining means being made by welding, gluing or by elements of the type rivet. The removable securing means will be preferred when the unit portions are likely to be frequently dismantled.

Advantageously, the removable securing means are made by means of screwing, connecting or detent elements on the edges of the adjacent unitary portions of the second face facing each other and disposed adjacent adjacent unit portions. Thus, the unitary portions placed edge to edge realize at least one continuous circular face of the stator ring.

Advantageously, the permanent securing means are made by welding, gluing or riveting the edges facing each other and arranged edge to edge by the edges of the adjacent unitary portions of the second face and the support member. This makes it possible to directly secure the unit portions together and avoids using an additional support member, which represents an economy of means and a decrease in the weight of the stator.

Advantageously, the support member has radial lights to the ring and positioned extending parallel to the edges of the adjacent unit portions.

Advantageously, the support member has complementary forms of bonding associated with forms of adjacent unitary portions forming the fastening means carried by each unit portion.

Advantageously, the forms of attachment carried by the support member are insertion cleats, each insertion cleat being of constant or variable prismatic shape along the length of the cleat, a vertex of a triangular section of the prismatic shape pointing to the support member and each of the two other vertices of a triangular section of the prismatic shape being housed in a groove of a second respective axial projecting shape carried by an edge facing each of the two portions adjacent units, the first side-projecting shape and the second axially projecting form flanking the insertion tab.

This allows axial retention of the unit portions and easy positioning of the unit portions by sliding along the cleat. The prismatic shape provides a substantial insertion cleat support surface for two adjacent unitary portions. It can also be considered another form than the prismatic shape such as a half-cylinder shape.

Advantageously, the forms of fastening carried by the support member are radial lights to the crown passing through the body of the mortise-forming support, opposite the support member of the adjacent unitary portions having a tenon penetrating a respective mortise in the mounted position of the adjacent unitary portions on the crown, the tenon occupying only a minor portion of an upper or lower face of each unit portion.

Minor part means that most of the upper and lower face is free of any tenon. This differentiates a pin according to the present invention from the connection according to a state of the art where it was the entire surface of the upper or lower face which formed tenon. A tenon and mortise connection provides a simple and effective blocking of unit portions with respect to the support member. The occupation of a minor portion of the face by the tenon means that most of the upper or lower face of each unit portion does not enter the interior of the mortise. This allows edge-to-edge in a circular configuration the unit portions.

Advantageously, each tenon and the associated mortise are welded together. This reinforces this mode of solidarity.

Advantageously, when a yoke forming the edge of the ring is present, an outer ring surrounds the yoke of the ring over its entire periphery.

There can be no radial deflection of the unitary winding portions out of the ring by the outside of the ring. The outer ring shrinks the mechanical strength of the unitary portions in the crown.

Advantageously, the cores of the unitary portions are made with laminated sheets, sintered magnetic materials or any other magnetic or non-magnetic material.

Advantageously, the unit portions are of variable shapes and dimensions for the same ring. The fact that the securing means on the upper or lower faces of the unit portion do not occupy the entire of this face, allows different shapes and sizes of unit portions to be adapted to the same support member, the securing means remaining the same for different unit sizes and can be adapted for example in similar mortises. It can be expected more mortises than unitary portions to have a freedom of adaptation of different unitary portions on the stator. The winding of the winding on each unit portion is made without space limit since the unit portions are not adjacent to each other during this winding which represents an easy assembly impossible to obtain for a crown already mounted in the stator for which the space left between two winding elements is very small.

The invention also relates to an electromagnetic machine having at least one stator carrying a series of coils and at least one rotor carrying at least one magnet, characterized in that the at least one stator is a stator as previously described. This machine can take various forms as motor, generator or electromagnetic actuator.

Other features, objects and advantages of the present invention will appear on reading the detailed description which follows and with reference to the appended drawings given by way of non-limiting examples and in which:

FIG. 1 is a schematic representation of a perspective view of a first embodiment according to the present invention of a ring of a stator comprising unitary portions each carrying a winding, a support member provided with means for integral with each unit portion, the coils and winding notches between the unit portions being visible in this figure,

FIG. 2 is a schematic representation of a perspective view of the first embodiment according to the present invention shown in FIG. 1, the support member provided with cleats being represented in FIG. 2, certain windings having been removed from FIG. this figure,

FIG. 3 is a schematic representation of a perspective view of a second embodiment according to the present invention of a ring of a stator comprising unitary portions, the adjacent unitary portions being joined together in this second embodiment. embodiment, the windings being represented in this FIG. 3,

FIG. 4 is a schematic representation of a perspective view of the second embodiment according to the present invention shown in FIG. 3, the windings not being represented and the winding slots between the unitary portions being visible in this figure; 4

FIG. 5 is a schematic representation of a perspective view of a third embodiment according to the present invention; a ring of a stator comprising unitary portions, the adjacent unitary portions being joined together in this embodiment by means of a support member having lights in this third embodiment,

FIG. 6 is a schematic representation of a perspective view of a fourth embodiment according to the present invention of a ring of a stator comprising unitary portions, the adjacent unitary portions being joined to each other in this embodiment of FIG. realization by means of a support member having securing forms cooperating with complementary shapes provided on each unit portion.

The figures are given by way of examples and are not limiting of the invention. They constitute schematic representations of principle intended to facilitate the understanding of the invention and are not necessarily at the scale of practical applications. In particular, the dimensions of the different pieces are not representative of reality.

In what follows, reference is made to all the figures taken in combination. When reference is made to one or more specific figures, these figures are to be taken in combination with the other figures for the recognition of the designated reference numerals.

For simplicity, when in a figure there are several elements of the same type such as unitary portions, mortises and tenons, notches, etc. , there is referenced only one element per type for simplicity and clarity of the figures.

Referring to all the figures, the present invention relates to a stator for an axial flow electromagnetic machine. The stator forming a ring 1 having two substantially circular opposite faces 1a, 1b. These opposite substantially circular faces 1a, 1b are connected by a thickness or slice of the ring 1, which can form a cylinder head 15. The circular face 1a of the ring 1 may be the face of the ring opposite the rotor thus forming a part of the air gap of the electric machine comprising the stator.

The ring 1 has an internal cavity 2 delimited by an inner periphery while the periphery of the ring may be delimited by the yoke 15 at the outer periphery of the ring 1. The stator comprises windings 3 regularly distributed in the ring 1. According to the invention, each unit portion 4 has a core 5 around which a winding 3 is wound, the unitary portions 4 forming at least partially the ring 1 being arranged, some by compared to others concentrically and put aboard. Edge to edge means that there exists only between the outermost outward edges of two adjacent unitary portions 4, for example the edges referenced 4b or 4a or the first lateral projecting shapes 14 in the figures, that a fair game enough for the assembly of the unitary portions 4.

A unit winding portion 4 is shown at a distance from the ring 1 of the stator in FIGS. 1, 2 and 6.

The set of winding unit portions 4 at least partially forming the ring 1 of the stator with the unit portions 4 disposed adjacent to each other concentrically at the center of the ring 1.

The unit portions 4 have upper and lower faces respectively forming the upper face and the lower face of the ring 1 of the stator. The unitary portions 4 each have securing means 11 with a support member 6 which may or may not be part of a casing housing the ring 1, by at least one upper or lower face of each unit portion 4 forming part of a face substantially. circular 1a, 1b and / or securing means 12, 12a, 14 with the casing carried by axial and lateral faces of each unit portion 4 edge to edge with an adjacent unitary portion.

The two types of securing means 11, 12, 12a, 14 described above can thus be used in combination or alternatively. When the securing means 11, 12, 12a, 14 are used in combination, the joining is stronger and the problem of maintaining the unit portions 4 on the stator is solved.

The elementary windings 3 carried by the unit portions 4 after assembly by forming the stator ring can be interconnected to form windings.

The unitary portions 4 forming the ring 1 of the stator can be made with laminated sheets or based on magnetic or nonmagnetic materials. Each unit portion 4 may thus have a body or tooth formed by an assembly of sheets placed against each other radially to the crown to the crown 1. This can be done by different sheets or by one or more sheets folded or wound up several times on themselves. The sheet portions thus created form concentric circular arcs. This is particularly clearly visible in FIGS. 1 to 4. Another arrangement of the sheets can however be implemented.

A housing, not shown in the figures can accommodate the ring 1. In this case, the support member 6, if it is present, may be part of the housing or the support member 6 may be an integral insert of the housing, of the same material or material different from the housing.

Between two cores 5 of adjacent unit portions 4 there remains a free space forming a notch 13 and, if appropriate, an isthmus 3a formed by the edges 4a located on the side intended to form an air gap on a first circular face 1a of the ring 1.

A first lateral projecting shape 14 may be between the edges 4a, 4b of the first and second faces, this on each lateral side of a unitary portion 4. The adjacent unit portions 4 are then disposed edge to edge at least by their first lateral protruding forms 14 abutting. It is the face 1b of the ring 1 intended to be opposite to the gap which can carry a support member 6.

The first lateral projecting shapes 14 of two adjacent unitary portions 4 may define, with the end portions near the edges 4b of the unitary portions, a receiving space for a securing element carried by a support member 6, advantageously a cleat 9.

The securing means 11, 12, 12a, 14 may be removable or permanent. In the first case, the securing means 1 1, 12, 12a, 14 removable can be performed by screwing elements, connecting elements or snap between adjacent unit portions 4. For example, the removable fastening means can be made by screwing elements, connection or snap on the edges 4b vis-à-vis the adjacent unit portions 4.

In the second case, the securing means 1, 12, 12a, 14 permanent can be performed by welding, gluing or by elements rivet type. For example, the securing means 11, 12, 12a, 14 permanent can be performed by welding, gluing or riveting the edges 4b vis-à-vis the adjacent unit portions 4. The welding or gluing can be done by points or by cord.

For example, the adjacent unitary portions 4 may be welded at the inner and outer peripheries of the ring 1 in order to improve the mechanical strength, this as an alternative or in addition to detachable connection means, the internal periphery delimiting the internal cavity 2 of the crown 1.

The dimensions of a support member 6 can be adapted to those of the associated circular face 1b. For example, the support member 6 may be of circular configuration, in particular in the form of a disk, being of a diameter slightly larger than the ring 1 and being concentric with the ring 1.

The support member 6 may have passages 8 in the ring 1 and positioned extending parallel to the edges 4b of the adjacent unit portions 4.

The support member 6 may have complementary securing means 9, 10 associated with the securing means 11, 12, 12a, 14 carried by the unitary portions 4.

As shown in FIG. 5, the passages 8 may be in the form of radial slots at the ring 1 and positioned in alignment with a respective notch 13 between coils 3 of adjacent unit portions 4, at this figure above each notch 13, this at least during the welding operation. It should be noted that this can also be valid for a gluing operation.

The notch 13 can be closed, in which case the edges 4b of the adjacent unit portions 4 partially delimiting the notch 13 are directly in contact. The notch 13 may also be semi-closed in which case a space remains between the edges 4b of the adjacent unit portions 4 delimiting one side of the notch 13, as shown in FIG. 4.

The cords or points of welding are advantageously on the edges 4b of the unit portions 4 glued against each other so being aligned with the middle of the notch 13 respectively between two adjacent unit portions 4. In Figures 3 and 4, it is not used support member. Bonding by welding or bonding can be done by points or weld seam or bonding on edges 4b vis-à-vis applied against each other of the two adjacent unit portions 4. This can be advantageously done on a face 1b of the two substantially circular faces 1a, 1b of the ring 1 or on both sides 1a, 1.

In Figure 5, there is used a support member 6 for a substantially circular faces. Bonding by welding or bonding can be done by points or weld seam or bonding on edges 4b vis-à-vis applied against each other of two adjacent unit portions 4, edges 4b being accessible from the outside of the ring 1 through the lights 8 when a support member 6 is provided.

Alternatively, a circular face 1b having no support member of the two substantially circular faces 1a, 1b of the ring 1 may have the edges 4b abutting of two adjacent unit portions 4 welded or glued one against the 'other.

Finally, it is also possible not to use a support member 6. In this case, it is the unitary portions 4 which are secured together, either permanently, for example by gluing or welding, or removably by connecting elements, screws or technical equivalents.

In the embodiment shown in FIGS. 1 and 2, the forms of fastening 9 carried by the support member 6 as complementary securing means may be insertion lugs 9. Each insertion lug 9 may be constant prismatic shape along the length of the cleat.

A vertex of a triangular section of the prismatic shape can point towards the support member 6 by being fixed on this support member 6. Each of the two other vertices of a triangular section of the prismatic shape can be housed in a groove 12a of a second respective axially projecting shape 12 carried near an edge 4b facing each of the two adjacent unitary portions 4 flanking the cleat 9.

The first form in lateral projection 14 and the second form in axial projection 12 can frame between them the insertion cleat 9 limiting its displacement. In the embodiment shown in FIG. 6, the forms of connection carried by the support member 6 may be radial lights to the ring 1 passing right through the support member 6 forming mortises 0.

Each face of the unit portions 4 vis-à-vis the support member may then have a pin 1 as securing means carried by each unit portion 4. Each pin 1 1 enters a respective mortise 10 in mounted position adjacent unit portions 4 on the crown 1. It is possible that in addition, each post 11 and the associated mortise 10 are welded together.

The tenon 11 can occupy only a minor portion of the upper or lower face of each unit portion 4. This has the major advantage of freeing space, the edges of the mortise 10 being directly above or below each portion 4 and not offset laterally above or below, as would be the case if it were the entire upper or lower face of the unit portion 4 which penetrated into the mortise, as shown in the most recent state of the art. close.

It can be provided more mortises 10 than ten studs 11 to provide a freedom of adaptation of a number of different unit portions 4, for example a combination of unit portions 4 of different dimensions, tenons 11 of unitary portions 4 of different dimensions remaining unchanged to fit in the same mortises 10.

For these two embodiments, it is possible to secure the unit portions 4 to each other on the circular face 1a, 1b opposite to that carrying the forms of attachment 9, 0. It is even possible to provide a support member 6 for this opposite circular face 1 a, 1b. This is not shown in Figures 1, 2 and 6.

It should be borne in mind that all the previously detailed embodiments can be combined with each other, two support members, a single support member 6 or no support members 6 can be used.

In some embodiments, when a yoke 15 is present on the edge of the ring 1, an outer ring 7 can surround the yoke 15 of the ring 1 over its entire periphery, which allows a radial auxiliary holding unitary portions 4 secured to the ring 1 according to the different embodiments.

The present invention also relates to an electromagnetic machine having at least one stator carrying a series of coils 3 and at least one rotor carrying at least one magnet, characterized in that said at least one stator is a stator as previously described.

By axial flow machine is meant any kind of motors, generators or axial flow electromagnetic actuators. This machine can be both mono-gap or poly-air gaps by having one or more stators and one or more rotors can be superimposed relative to each other being separated by at least one gap on the same shaft. In a poly-air-electric machine, it is preferred not to use a support member as the two substantially circular opposite faces 1a and 1b are located on the side of a respective gap.

For the same ring 1, the unit portions 4 may be of variable shape and size, for example twice as large or have different profiles.

In a method for manufacturing such a stator and an electromagnetic machine, the winding of a winding 3 is carried out on a core 5 forming a unitary portion 4 dissociated from the other unitary portions 4. This ^• can be done separately for each unit portion 4 then dissociated from the other unit portions 4.

This can be done in another position than the stator mounting station and not necessarily directly before mounting the stator. The unitary portions 4 and individually assembled can be stored as such and for example stored until they are mounted to form the crown 1 of the stator.

It is then carried out the joining of the unit portions 4 between them and / or at least to a support member 6 to form the crown 1 of the stator.

The solutions proposed by the present invention are well suited for producing a stator with semi-closed cores or teeth and can be applied in the case of open notches. The nuclei can be of variable size. The invention is in no way limited to the described and illustrated embodiments which have been given by way of example only.

Claims

1. Stator for an electromagnetic machine with axial flow, the stator forming a ring (1) having two substantially circular opposite faces (1a, 1b), the stator being composed of several unitary portions (4) defining the two opposite faces substantially circular (1 a, 1 b), each unit portion (4) having a core (5) around which is wound the winding (3), the unitary portions (4) forming at least partially the ring (1) being arranged one relative to one another concentrically, characterized in that the unitary portions (4) continuously define the two substantially circular opposite faces (1a, 1b) being arranged concentrically edge-to-edge to each other and have securing means ( 12, 12a, 14) with a support member (6), which may or may not be part of a housing housing the ring gear (1), carried by axial and lateral faces of each unitary portion (4) edge-to-edge with a unitary portion adjacent, or securing means (11) with said support member (6) carried by at least one upper or lower face of each unit portion forming part of a substantially circular face.

2. Stator according to the preceding claim, wherein each unit portion (4) has an assembly of plates placed against each other radially to the ring (1).

3. Stator according to any one of the two preceding claims, wherein the support member (6) is an integral part of the housing or is an integral part of the housing.

4. Stator according to any one of the three preceding claims, wherein between two cores (5) of adjacent unit portions (4) remains a free space forming a notch (13) and, where appropriate, an isthmus (13a) formed by the edges (4a) located on the side intended to form an air gap on a first circular face (1 a) of the ring (1), the edges (4b) of each unit portion (4) of a second face (1b) of the ring (1) opposite to the first circular face (1a), a first side projecting shape (14) being between the edges (4a, 4b) first and second faces of each lateral side of a unitary portion (4), the adjacent unitary portions (4) being disposed edge to edge at least by their first lateral projecting shapes (14).

5. Stator according to the preceding claim, wherein the securing means (12, 12a, 14) are removable or permanent, the removable fastening means (12, 12a, 14) being made by screwing elements or latching between the unitary portions (4) adjacent and the permanent joining means being made by welding, gluing or rivet-type elements.

6. Stator according to claim 5, wherein the removable fastening means made by screwing elements, connection or latching are active on the edges (4b) of the adjacent unit portions (4) of the second face (1b). vis-à-vis and arranged end to end.

7. Stator according to claim 5, wherein the permanent fastening means are made by welding, gluing or riveting the edges vis-à-vis the adjacent unitary portions (4) of the second face (1b) and the body of support (6).

8. Stator according to any one of claims 4 to 7, wherein the support member (6) has lights (8) radial to the ring (1) and positioned extending parallel to the edges (4b) of the unitary portions (4) adjacent.

9. Stator according to the preceding claim, wherein the support member (6) has complementary forms of attachment (9,

10) associated with shapes (11, 12, 12a, 14) of unitary portions (4) adjacent providing the fastening means carried by each unit portion (4). 0. Stator according to claim 9, wherein the forms of attachment carried by the support member (6) are insertion cleats (9), each insertion cleat (9) being of constant or variable prismatic shape along the length of the cleat, a vertex of a triangular section of the prismatic shape pointing towards the support member (6) and each of the two other vertices of a triangular section of the prismatic shape housed in a groove (12a) of a second axially projecting respective shape (12) carried by an edge facing each of the two adjacent unitary portions (4), the first form projecting side (14) and the second axially projecting form (12) flanking the insertion tab (9).

11. Stator according to claim 9, wherein the forms of attachment carried by the support member (6) are radial lights to the ring (1) passing through the support member (6) forming mortises (10). against the supporting member (6), adjacent unitary portions (4) having a tenon (11) penetrating a respective mortise (10) in the mounted position of the adjacent unitary portions (4) on the crown the tenon (11) occupying only a minor portion of the upper or lower face of each unit portion (4).

12. Stator according to the preceding claim, wherein each pin (1 1) and the mortise (10) associated are welded to each other.

13. Stator according to any one of the preceding claims, wherein, when a yoke (15) forming the edge of the ring (1) is present, an outer ring (7) surrounds the yoke (15) of the ring (1). ) on its entire periphery.

14. Stator according to any one of the preceding claims, wherein the cores (5) of the unit portions (4) are made with laminated sheets, sintered magnetic materials or any other magnetic or non-magnetic material.

15. Stator according to any one of the preceding claims, wherein the unit portions (4) are of varying shapes and sizes for the same ring (1).

An electromagnetic machine having at least one stator carrying a series of coils (3) and at least one rotor carrying at least one magnet, characterized in that said at least one stator is a stator according to any one of claims 1 to 15 .