WO2004075381A1

WO2004075381A1 - Stator having a cooled core

Info

Publication number: WO2004075381A1
Application number: PCT/EP2004/001636
Authority: WO
Inventors: Peter Rosner
Original assignee: Intrasys Gmbh Innovative Transport-Systeme
Priority date: 2003-02-19
Filing date: 2004-02-19
Publication date: 2004-09-02
Also published as: DE20302710U1

Abstract

A stator for a linear motor or linear generator comprises a core (48; 148) and a number of winding coils (22; 122) that, with at least one winding coil section, face at least one side of the core (48; 148). According to the invention, at least one coolant path (74, 76, 82; 274, 276, 282, 292, 294, 296) for cooling the core (48; 148) is provided inside the core (48; 148).

Description

Stator with a cooled core

description

The present invention relates to a stator for a linear motor or linear generator, comprising a core, and a plurality of winding coils, each of which faces at least one winding coil section on at least one side of the core.

Stators of this type are generally known in the art and are used in a large number of cases as a drive for moving devices or as a generator.

A disadvantage of the known stators is that they heat up during operation, which leads to a reduction in the efficiency of the stator, for example due to an increase in the resistance of the electrical lines with an increase in the temperature. There is also often a risk of the stator overheating, so that its permissible on-time is shortened accordingly or the power permissible for continuous operation is correspondingly lower.

Losses occurring in the stator are a source of this heating. There, more precisely, eddy current losses occur in the core (so-called "iron losses") and losses in the electrical lines of the winding coils due to electrical resistance (so-called "copper losses").

It is therefore an object of the present invention to provide a generic stator in which heating during operation is reduced by increased cooling.

This object is achieved by a stator, in the core of which at least one coolant path is provided for cooling the core. Through the

Coolant web can then be passed a coolant, which heat receives from a wall of the coolant path and dissipates the absorbed heat from the core and from the stator. This removes heat from the core, which leads to a reduced operating temperature compared to a core without a coolant path.

In order to increase the efficiency of stators, the core is generally designed as a lamella package consisting of ferromagnetic lamellae which are thin in comparison to the thickness of the core. This design complicates the formation of eddy currents in the core and reduces the losses caused by eddy currents. An embodiment of the core as a laminated core is therefore also advantageous for a stator according to the present invention.

In the case of a core designed as a lamella package, the coolant path can be implemented in a structurally simple manner in that at least some of the fins are designed as cooling fins, each of which has at least one coolant channel recess running at least in sections in the lamella plane and surrounded at least in the lamella plane by lamella material. The lamella material surrounding the coolant channel recess, at least in the lamella plane, ensures the tightness of the coolant path in a particularly simple manner and prevents coolant from escaping from the core, especially when the lamellae are glued to one another.

Basically, it can be considered to build the core exclusively from cooling fins, which leads to a particularly strong cooling effect. However, it should be borne in mind that any material recess in the interior of the core weakens the actual function of the core, namely to conduct the magnetic field that penetrates it. In order to limit a weakening of the core caused by coolant channel recesses, another part of the fins can be designed as solid core fins, the core fins to ensure that the cooling fins are supplied with coolant at least one Have a connection opening for supplying or removing coolant to or away from the cooling fins.

The at least one coolant channel recess in a cooling fin can be designed as a long groove. This enables the core to be constructed exclusively from cooling fins, since the long groove is surrounded not only in the finned plane, but also in a direction orthogonal to it, and thus a finned core is also provided in the core as the first and / or last fin in the fin stack direction can.

However, by using long grooves as the coolant channel recess, the flow cross section available for a coolant flow is limited. Accordingly, the maximum amount of coolant that can be passed through the coolant path per unit of time is small. The coolant flow flowing through the core can be increased in that the at least one coolant channel recess as an elongated hole, i.e. passing through the cooling fin is formed. A coolant channel of any cross-section can then be created, for example, by stacking several cooling fins. In addition, an elongated hole can be produced particularly easily, for example by punching from a lamella sheet.

To remove as much heat as possible, it is advantageous if the coolant flowing in the at least one coolant channel recess is in contact with the lamella material surrounding it for as long as possible. An extended contact time is achieved, for example, if the elongated hole or the elongated groove in the lamella plane is angled several times, preferably in a meandering fashion.

In order to ensure a clear positional relationship of adjacent fins to one another in the finned core forming the core, a finned section surrounding the at least one coolant channel recess can at least be implemented in a structurally particularly simple manner be designed in sections to fix the cooling fin in the fin package. The correct positional relationship of adjacent fins in the plate pack improves the tightness of the core through which coolant flows. The formation of the lamella section for fixing the cooling lamellae in the lamella package can be achieved, for example, by providing a groove on one side (groove side) of the cooling lamella section and by providing a spring or generally a projection on the side of the cooling lamella section opposite the groove side. In this way, the projection of one lamella in the lamella package can engage in the groove of the adjacent lamella, whereby a further improved sealing effect can be achieved.

Another embodiment, which is particularly easy to manufacture and therefore preferred, has at least one through opening, which in the packaged state is penetrated by an enforcement element. Forming a groove on the outer edge of the lamellae of the lamella package, into which a projection engages in the packaged state, also represents a stacking aid that can be realized with simple means. This also enables a defined positional relationship between the lamellae to one another. The through openings or edge grooves can also be provided in addition to the tongue and groove design mentioned above

The cooling lamella can be designed particularly advantageously in such a way that the lamella section surrounding the at least one coolant channel recess has at least one lug with a through opening projecting into the at least one coolant channel recess. The nose protruding into the coolant channel recess then forms a flow obstacle which must be flowed around by a coolant, so that with a corresponding design or arrangement of several lugs the flow path of the coolant through the coolant channel recess can be extended and thus the amount of heat absorbed and dissipated by the coolant can be increased. The coolant channel recesses of the individual cooling fins provided in the core can be connected to one another in terms of flow in terms of flow, at least in sections, which in the case of trouble-free operation means that coolant actually flows through any cooling fins that are present. The largest possible amount of heat dissipated in a row arrangement of cooling fins can then be achieved, for example, by meandering flow of the coolant through the core. In terms of design, this can be achieved with little effort while avoiding or at least reducing a weakening of the magnetic field strengthening function of the core in that cooling fins are arranged in the core in the stacking direction of the plate pack between core plates and the at least one connection opening of a first core plate with respect to the at least one connection opening of one in the stacking direction of the plate core immediately following the second core plate, which is separated from the first core plate by at least one cooling plate, is arranged offset in a plate plane direction. In this arrangement, cooling fins or cooling lamella sub-packs which follow one another in the stacking direction are flowed through by coolant in mutually opposite directions.

In order to achieve long flow paths and thus large amounts of heat that can be dissipated, the at least one connection opening of the one core lamella is preferably offset essentially in the longitudinal direction of the lamella, particularly preferably towards opposite end regions of the core, to the at least one connection opening of the lamella following in the stacking direction.

In the core in the stacking direction of the disk pack, core disk sub-packs can be provided in order to increase the magnetic field conducting effect of the core. In this case, the at least one connection opening of the core lamellae of a core lamella subpackage can form at least one passage channel for the passage of coolant. By forming core lamella subpackages, a defined distance of cooling zones formed by cooling fins or cooling lamination subpackages can be set. The cooling zones can thus be arranged in regions of the core that are optimal for taking heat from the core while at the same time maintaining the magnetic field-conducting effect of the core.

Alternatively or additionally, cooling fins can be provided in the core in a fluidic parallel connection, at least in sections. As a result, cooling of the core can be maintained even if individual coolant channel recesses should be blocked or closed by contamination of the coolant. In terms of design, the parallel connection of coolant flows in cooling fins while avoiding excessive weakening of the magnetic field strengthening effect of the core can be achieved in that core fins each have at least two connection openings, at least one being provided as a coolant supply opening and at least one further as a coolant discharge connection opening.

In such a case, the core is flowed through like a radiator, i.e. one of the at least two connecting openings in the core lamellae form a coolant supplying passage and another of the at least two connecting openings of the core lamellae forms a coolant discharging through channel. Between the two through-channels, coolant channel recesses of cooling fins are connected in parallel in terms of flow, which connect the through-channels to form a coolant path.

To set a desired coolant channel cross section in the core, this can comprise cooling lamella sub-packages.

The manufacture of the core formed as a lamella package can advantageously be simplified in that cooling fins and core lamellae have the same thickness and preferably the same material and are particularly preferably made from the same lamella blanks. It is then possible to produce both cooling fins and core fins from the same starting material or the same semi-finished product.

The winding coils can indeed be arranged in any manner on the core, as long as at least one winding coil section of a winding coil faces at least one side of the core. However, the winding coils preferably surround the core in such a way that their respective winding planes are oriented essentially orthogonally to the longitudinal direction of the core. This arrangement is less expensive to manufacture, in particular because of the possibility of using pre-wound coils. Pole toothed disks are preferably arranged between adjacent winding coils.

In order to improve the cohesion of the core as a laminated core in addition to the gluing, the core can have at least one through opening penetrated by a tensioning means. A simple but effective clamping device is a screw-nut combination. This includes generally available and easy to obtain inexpensive standard parts.

To attach the stator to a base, at least one stator foot can be mounted on the core. With regard to the low number of components required to form the stator, it is advantageous if the clamping means is formed by a head screw which penetrates the core essentially in the stacking direction and the stator foot into which the head screw is screwed.

At least one coolant supply and at least one coolant discharge line can be connected to the core for supplying and removing coolant to and from the core. Core lamella connection openings are suitable as connection points for the lines mentioned. These are present anyway and are in fluid-conducting connection with the cooling fins, so that connection to connection openings takes place with the least assembly effort can.

A liquid coolant, such as a cooling oil, which has particularly good convective heat transport properties, can preferably be used as the coolant. However, it can also be considered to use a gas as the coolant, which has to overcome a lower flow resistance than a liquid coolant when flowing through small flow cross sections in the coolant channel recesses.

An easy-to-transport stator, which is also well protected against external influences, can be obtained by surrounding a structural unit consisting of a core, winding coils, preferably at least one stator foot, at least one coolant supply line and at least one coolant discharge line, preferably including toothed lock washers, in a stator housing and is fixed in it by hardened casting compound.

For the purpose of simple assembly, the stator housing can be formed by a stator shell and a stator shell cover covering it. The structural unit can then simply be inserted into the stator shell and fixed to the stator shell by subsequently pouring in casting compound, in particular adhesive.

The electrical connection lines for the winding coils accommodated there must be fed into the stator housing. In this case, undesired damage caused by tensile forces acting on the electrical lines can be counteracted by providing a strain relief device on the stator housing. In order to avoid unnecessary complexity in the construction of the stator, the at least one coolant supply line and the at least one coolant discharge line can be led through the at least one strain relief device. This means that the coolant lines or their connection points are also on the core protected from damage by tensile forces.

In addition to the iron losses in the core, the copper losses in the windings were also addressed at the beginning. The heating of the stator according to the invention can therefore be further reduced in that the cured casting compound at least in sections connects the structural unit to inner wall regions of the stator housing, the volume of space occupied by the structural unit and the cured casting compound being smaller than the interior volume delimited by the stator housing, so that in Inside the stator housing, a free space remains as a flow space for a coolant, through which a coolant can be passed.

So far, it has been common to completely remove the stator shell, i.e. Fill up to the opening edge of the stator shell with casting compound and then cover it with the stator shell cover. However, it has been shown that it is possible to leave a free space in the interior of the stator housing as a flow space for a coolant without a loss of rigidity and stability of the stator which impairs the function. A coolant can be passed through this, which removes heat convectively from the stator housing.

In principle, it is possible to let the coolant flow only over a surface of the casting compound hardened in the stator housing. In this case, the winding spools can be completely covered by casting compound. Although a particularly high stability of the stator is achieved here, heat must be conducted from the winding coils to the coolant through the casting compound, which is generally poorly heat-conducting (these are usually castable plastics with a correspondingly low thermal conductivity or adhesive). With regard to the amount of heat that can be dissipated per unit of time, it is therefore advantageous if cooling sections of the winding coils protrude into or penetrate the flow space such that they can be brought into contact with the coolant. In the case of a stator housing formed from the stator shell and the stator shell cover, the bottom of the stator shell generally forms the side of the stator near the rotor because the base (preferably GRP with a wall thickness of approximately 1 mm) is easy to mount the stator on a substrate and to minimize the magnetic air gap ) is usually thinner than the lid (due to the required mechanical strength, preferably with a wall thickness of approx. 2 mm - 3 mm).

By pouring the casting compound from the bottom of the stator shell to a height below the stator shell opening in such a way that in each case a part of the winding coil sections which are guided around the side of the core remote from the rotor is not cast in and thus form cooling sections lying in the flow space formed between the casting compound surface and the stator shell cover on the one hand, the winding coil sections opposite a stator shell inner wall are securely fixed to it by casting compound and a stator with great rigidity is produced. In this case, apart from the winding coil sections which are guided around the side of the core remote from the rotor, winding coil sections can rest against the lateral inner walls and at the bottom of the stator shell and be connected to the latter by casting compound. On the other hand, a winding coil section which contributes little or not at all to the stability and rigidity of the stator can be used for dissipating heat to the coolant.

To extend its service life, the core can be protected from environmental influences by the fact that it is surrounded by casting compound on all of its long sides, preferably also on its end faces.

The amount of heat that the coolant can dissipate per unit of time from the winding coils depends on the area of the winding coils that can be brought into contact with the coolant. This can be increased significantly by the fact that the casting compound, in particular adhesive, is applied only in a region close to the wall of the inner walls of the stator housing, in particular between

Inner wall sections of the stator housing and in the assembled state opposite outer surface sections of the stator assembly, preferably of outer surface sections of winding coils and / or pole toothed disks, so that at least a part of winding coil sections or / and pole toothed disks pointing towards the inner walls of the stator housing is wetted by casting compound and at least part of the core indicative winding coil sections or / and of winding coil sections running between inner walls of the stator housing protrude as cooling sections into the flow space or penetrate it. The application of casting compound, in particular adhesive, only near the wall of the stator shell inner walls leads to a sufficiently stiff and robust stator. The resulting stator offers a very large flow space volume for cooling the stator by a coolant flowing through the flow space.

Furthermore, it is important to conduct the coolant with the lowest possible flow resistance through the stator past the at least one cooling section of the winding coils. The flow resistance can be reduced, at least in the area of the at least one stator foot, in that it has a section of reduced cross-section in the area of the flow space.

As has already been described, stators for utilizing the magnetic flux are generally provided with pole tooth disks between winding coils adjacent along the longitudinal direction of the core. By reducing the flow cross-section inside the stator housing, these can also represent a considerable flow obstacle for the coolant. In order to keep this impediment to the coolant flow as low as possible, the pole toothed disks can have passage openings. Alternatively or additionally, to simplify their manufacture, the pole toothed disks can also be designed such that they have passage openings form with the housing and / or with the core.

Such a passage opening can be formed with the housing in a particularly simple manner in that at least one passage outer edge section of the pole toothed disks is at a distance from a passage inner wall section of the stator housing, the passage outer edge section being set back with respect to this adjacent outer edge sections and / or a radius of curvature of the passage Outer edge portion has a value other than a radius of curvature of the passage inner wall portion. The different radii of curvature of the inner wall sections of the stator shell and these opposite outer edge sections of the pole toothed disks lead to gaps through which coolant can flow.

A passage opening with the core, on the other hand, can be formed simply in that at least one passage inner edge section of the

Polzahn discs through-passage outer wall sections of the core at a distance

^{■ are} opposite, the passage inner edge section being set back with respect to this adjacent outer edge sections and / and a radius of curvature of the passage outer edge section having a different value than a radius of curvature of the passage inner wall section.

Since the pole toothed disks are in direct and therefore heat-conducting contact with the core, the pole toothed disks can also be used to cool the core. In addition, there is also a certain electromagnetic heating of the pole toothed disks themselves. It is therefore proposed to provide at least some of the pole toothed disks with at least one coolant path for cooling the toothed disk.

The pole tooth disks can be provided with inner cooling channels by forming part of the pole tooth lamellae with inner recesses similar to the lamellae of the core. However, it is particularly simple and therefore preferred if one takes advantage of the fact that the toothed pulleys with their Fit the outer circumference flat against the stator housing. To form the cooling channels, it is therefore sufficient to provide the pole tooth disks with external grooves, since these are closed off from the outside by the stator housing.

The object described above is also achieved by a method for cooling a stator of the type mentioned at the outset, which comprises a step of passing a coolant through the stator, in particular through the core.

The present invention will be explained in more detail with reference to the accompanying drawings. It shows:

1 shows a schematic longitudinal section through a first embodiment of a stator according to the present

Invention;

FIG. 2 shows a section along line INI in FIG. 1;

3 shows a section along line III-III in FIG. 1;

FIG. 3A shows a partial section along line IIIA-IIIA in FIG. 3;

Figure 4 shows a section along line IV-IV in Figure 1;

FIG. 5 shows a schematic longitudinal section through a second embodiment of the present invention;

Figure 6 is a sectional view taken along line VI-VI in Figure 5;

Figure 7 is an exploded view of a first embodiment of lamellae forming the core of the stator of Figures 1 and 5; such as Figure 8 is an exploded view of a second embodiment of the lamellae forming the core of the stator of Figures 1 and 5.

In Figure 1, a stator according to the invention is generally designated 10. The stator has a stator housing 12 with a stator shell 14 and a stator shell cover 16 covering one of the opening 15 of the stator shell 14. The stator shell cover 16 is glued to the stator shell 14 by an adhesive bead 18 running around the stator shell 14 near its opening 15.

In the stator housing there is a structural unit 20, which comprises a core (not visible in FIG. 1), winding coils 22 surrounding the core, pole toothed disks 24 arranged between adjacent winding coils, and stator feet 26 screwed to the core and extending towards the stator shell opening 15.

On the stator shell cover 16, two strain relief devices 28 and 30 are provided, through which electrical lines (not shown) are led to the winding coils 22 of the assembly 20. A coolant supply line 32 is guided through the left strain relief device 28 in FIG. 1, through which a coolant is introduced into a coolant path provided in the core. A coolant discharge line 34 is guided through the strain relief device 30 on the right in FIG. 1, through which coolant is discharged from the coolant path in the core to a coolant tank (not shown) or a heat exchanger (cooler) (not shown).

Furthermore, one coolant inlet 36, which is provided between the strain relief devices 28 and 30, and two coolant outlets 38 and 40, each in a longitudinal end region of the stator shell cover 16, are provided on the stator shell cover 16. Through the coolant inlet 36 a coolant is introduced into a free space 42 inside the stator housing 12, which coolant flows through the free space 42, thereby absorbing heat and finally leaves the stator 10 again at the coolant outlets 38 and 40. In FIG. 1, black arrows indicate an example of a possible flow of the coolant in the free space 42 of the stator housing 12.

In FIG. 1, the side of the stator shell 14 that is close to the rotor or facing a rotor (not shown) is designated by 14a. This is formed by the bottom 14d of the stator shell 14 lying orthogonal to the plane of the drawing in FIG. The flow shown in the interior of the stator housing 12 near the side 14a of the stator shell 14 close to the rotor can be such that a coolant flow from left to right, as shown on the left side of the stator 10 of FIG. 1, is in front of the drawing plane 1, while the flow shown on the right side of the stator 10 can form from right to left in a plane lying behind the plane of the drawing. Alternatively, a channel 44 can be provided in one of the packages of pole toothed disks 24, through which the coolant can flow back from the side of the assembly 20 near the rotor to the side away from the rotor. Such a channel is shown in dashed lines in Figure 1.

The winding coils 22 surround the core, their winding plane WE, which is orthogonal to the drawing plane in FIG. 1, being oriented orthogonally to the longitudinal direction L of the core. As a result, a particularly large number of winding coils 22 can be arranged on the core in such a way that the direction of the magnetic field which is formed in the space surrounding the winding coils 22 is parallel to the longitudinal direction L of the core. This leads to an effective use of the core.

FIG. 2 shows a cross section through the stator 10 from FIG. 1 along the line INI shown in FIG. 1. A core 48 composed of cooling fins 66 and core fins 68 can be seen in FIG. The fins 66 and 68 have through holes 49 and 50, through which a cap screw 52 is passed and screwed into a threaded bore 54 of the stator foot 26. The cap screw 52 and the stator 26 form a clamping means by which the lamellae 66 and 68 are held together. The free space 42 is subdivided into three partial free spaces that communicate with one another in terms of flow technology: a first partial free space 42a is delimited by the stator shell cover 16 and the side of the assembly 20 remote from the rotor. A second partial free space 42b is delimited by inner wall sections of the stator shell 14 near the rotor and near the rotor Edge sections 24e of the pole toothed disks 24 or edge sections 22b of the winding coils 22 near the rotor (see also FIG. 4). A third partial free space 42c is formed by a passage inner edge section 24a of the pole tooth disks 24 and an outer wall section 48a of the core 48. The head 52a of the screw 52 is also accommodated in the free space 42c.

In order to fix the structural unit 20 in the housing 12, a casting compound 56 is applied to the inner walls of the stator shell 14. The casting compound 56 is only provided in a region of the inner walls and the bottom of the stator shell 14 close to the wall, the casting compound 56 being present both on the winding coils 22 and on the outer edge sections 24b, 24c and 24d of the pole toothed disks 24, which are on the inner walls 14c, 14d and 14e of the stator shell 14, adheres and thus fixes them to the inner walls 14c, 14d and 14e of the stator shell 14. For example, the pole toothed disk 24 from FIG. 2 lies with its straight outer edge sections 24b and 24c against the inner side walls 14c and 14e of the stator shell 14 and lies with its straight outer edge section 24d against the bottom 14d of the stator shell 14.

A first passage outer edge section 24e of the pole toothed disk 24 lies opposite a first curved passage inner wall section 14b of the stator shell 14. Due to the different curvature of the Both sections - the passage outer edge section has a very small radius of curvature, while the straight passage outer edge section 24e has an infinitely large radius of curvature - a passage opening 25 is created in the partial free space 42b.

Alternatively, the passage outer edge section of the pole toothed disk 24 corresponding to the passage outer edge section 24e '(see in FIG. 2 on the right) can be designed with a larger, but finally large, radius of curvature than the passage inner wall section 14b' of the stator shell 14 opposite it.

It should be noted that the stator foot 26 has a section 58 of smaller cross section in the region of its shaft 26a in order to provide the largest possible flow cross section in the partial free space 42a for the coolant.

3 and 3A essentially show a pole toothed disk 24 "which is alternative to the pole toothed disk 24 of FIG. 2. Instead of passage outer edge sections which, as shown in FIG. 1, together with the inner wall sections of the stator shell 14 or a hardened one applied thereon Layer on casting compound 56 form a passage opening, "passage openings 25" are provided in the pole toothed disk 24, through which the cooling medium can pass.

Since the pole toothed disks 24 have direct contact with the core 48, the pole toothed disks 24 can also be used for additional cooling of the core 48. In order to enlarge the contact area with the cooling fluid, the toothed pulleys 24 can therefore each be provided with an inner channel system through which the cooling fluid flows. For the sake of simplicity, the stator shell 14 which contacts the toothed pulleys 24 on three sides can be used to limit such cooling channels. As an example, FIGS. 3 and 3A show two lateral grooves 24a and 24b which extend from top to bottom in FIG. 3 and which by correspondingly reducing the width of some internal ones

Pol toothed disk plates can be achieved. Both longitudinal grooves 24a and 24b are delimited towards the outside by the stator shell 14, wherein the comparatively thin layer of casting compound 56 on the inside of the stator shell 14 can still be seen in FIG. 3A.

Instead of a respective groove 20a or 20b on the two sides of the toothed disk, several grooves can also be incorporated. The two mutually opposite grooves can also be connected to one another by a groove in the base region of the stator shell.

FIG. 4 shows a section along line IV-IV of FIG. 1 through a winding spool 22. The pole toothed disk 24 shown there corresponds to that shown in FIG. 2, the pole toothed disk 24 from FIG. 4 having passage outer edge sections 24e 'which have a larger radius of curvature than the passage inner wall sections 14b opposite them.

In FIG. 4, the section 22a of the winding spool 22 remote from the rotor forms a first cooling section thereof, which is surrounded by coolant in the partial free space 42a and is thereby cooled. A second cooling section 22b of the winding coil 22 is formed by the winding coil sections 22b pointing towards the second partial clearances 42b. A third cooling section 22c of the winding coil 22 is formed in the region of the third free space 42c. This is a winding coil section 22c pointing towards the side of the core 48 near the rotor.

A second embodiment of a stator according to the invention is shown schematically in longitudinal section in FIG. In FIG. 5, the same components as in FIG. 1 are provided with the same reference numerals, but increased by the number 100. The embodiment shown in FIG. 5 will be described in the following only to the extent that it differs from that shown in FIG. Otherwise, reference is made to the description of FIGS. 1 to 4 directed.

The essential difference between the embodiment of FIG. 5 and that shown in FIG. 1 is that in the stator 110 of the second embodiment, casting compound was filled into the stator shell 114 from the bottom 114a of the stator shell 114 up to a height H. As a result, there is only a single free space 142 near the stator shell cover 116 on the side of the core remote from the rotor. The stator shell cover 116 has a coolant inlet 136 near its one longitudinal end, through which coolant is introduced into the free space 142. A coolant outlet 140 is provided near the other longitudinal end of the stator shell cover 116, through which coolant is discharged from the free space 142. This arrangement of coolant inlet 136 and coolant outlet 140 can ensure that the coolant flows through the free space 142 as far as possible over its entire length and thereby absorbs heat from the windings.

FIG. 6 shows a cross section along the line VI-VI of FIG. 5. It can be seen there that the winding coil section 122a, indicated by dashed lines and passing through the free space 142, is the only cooling section of the winding coil 122. The coolant flows around the latter and gives off heat to it.

It can also be seen that the filling height H is selected such that the core 148 is completely surrounded by casting compound 156. As a result, the core 148 is good against environmental influences, such as. B. moisture, protected.

FIG. 7 shows the structure of the cores 48 or 148 of the two stator embodiments shown in FIGS. 1 to 6. FIG. 7 shows three core lamella subpackages 60, 62 and 64, between which cooling fins 66 are arranged.

The core fins 68 (see core fins sub-package 60) and the cooling fins 66 have the same thickness. For reasons of clarity, however, individual core lamellae are not shown in the core lamella packs 60, 62 and 64, but rather are only indicated in the core lamella subpackage 60 at the right edge thereof in FIG. 7.

Representing the core lamellae of the same design, the core lamella 68 above in the core lamella subpackage is described below:

The core lamella 68 has three through holes 50, which is penetrated by a screw, such as the screw 52 in FIG. 2, in the assembled state. In addition, the core lamella 68 has two connection openings 70 and 72, the connection opening 72 serving for the supply of coolant from the coolant to the cooling fins 66 and the connection opening 70 serving for coolant removal from the cooling fins 66. The connection openings 70 and 72 of the core plate sub-package 60 are arranged coaxially and form a through-channel 74 and 76 in the packaged state.

The core lamellae 68 of all core lamellae subpackages 60, 62 and 64 have grooves 77, 79 running in the stacked state in the packaged state and aligned with one another on the outer edge at the longitudinal end regions of the long side edges 78 and 80. These grooves 77, 79 serve to receive two wedges in order to fix the stacked lamellae in a clear position relative to one another.

The cooling fin 66 has a coolant channel recess in the form of an elongated hole 82, which extends essentially in the longitudinal direction of the fin. The elongated holes 82, for example produced by water jet cutting, are surrounded by a lamella material section 84, from which three lugs 86 protrude into the elongated hole 82. The lugs 86 have through holes 49 which, in the assembled state, are aligned with the through holes 50 of the core lamella 68 and be penetrated by the same screw 52.

The uppermost core lamella subpackage 64, which in the assembled state is closest to the rotor, has a top lamella 90 as the top lamella 90, which essentially corresponds to the core lamella 68. In contrast to the core lamella 68, however, the cover lamella 90 has no connection openings. In the assembled state, the screw head 52a of the screws passing through the through openings 50 and 49 lies on the cover plate 90.

The core shown in Figure 7 is flowed through like a radiator, i.e. Coolant enters through the connection openings 72, flows in parallel through the elongated holes 82, for example from right to left in FIG. 7, to the coolant discharge side and is discharged through the connection openings 70.

FIG. 8 shows a second embodiment of a core with a coolant path provided therein. The same components and elements as in FIG. 7 are provided with the same reference numerals, but increased by the number 200. The embodiment in FIG. 8 is only explained to the extent that it differs from that shown in FIG.

In the embodiment shown in FIG. 8, coolant is passed through the passage 276 of the core lamella subpackage 260 to the lower cooling lamella 266 in FIG. In the coolant channel recess of the lower cooling fin 266 in FIG. 8, the cooling medium flows from the right to the left longitudinal end of the cooling fin. In contrast to the embodiment of FIG. 7, the lowest core lamella subpackage 260 in FIG. 8 has no connection opening at the longitudinal end (left longitudinal end in FIG. 8), which is opposite the longitudinal end having the through-channel 276. In contrast, in the core lamella subpackage 262 located between the lower and the upper cooling lamella 266 there is a through channel 292 in the left end region of FIG Core lamella sub-package 262 is provided, ie the through-channel 292 is arranged orthogonally to the connection opening flow direction D with the greatest possible offset to the through-channel 276 of the lamella sub-package 260 preceding in the stacking direction S.

In the upper cooling fin 266 in FIG. 8, the coolant flows in the coolant channel recess 282 in comparison to FIG

Coolant flow direction of lower cooling fin 266 in the opposite direction. The coolant channel recess 282 of the upper cooling fin 266 is designed at its right longitudinal end to extend beyond the coolant channel recess of the lower cooling fin 266. The coolant is led away from the upper cooling fin 266 through a through channel 294, which is formed in the core fin partial package 262 in flow connection with the coolant channel recess 282 of the upper cooling fin 266 by aligning connection openings of individual core fins in alignment. This through-channel 294 is followed by a through-opening 296 on the lower cooling lamella 266 and a through-channel 274 on the lower core lamella sub-package. The coolant channel supply line and the coolant channel discharge line can be connected to the through channels 274 and 276 of the core lamella subpackage 260, if this is the first core lamella subpackage in the stacking direction S.

In contrast to the embodiment shown in FIG. 7, in which the coolant channel recesses 82 of the cooling fins are blown in parallel, the embodiment shown in FIG. 8 is a fluidic series connection of the cooling fins present in the core.

Claims

Expectations

1. A stator for a linear motor or linear generator, comprising: a core (48; 148) and a plurality of winding coils (22; 122), each of which faces at least one winding coil section on at least one side of the core (48; 148), characterized in that in the core (48; 148) at least one coolant path (74, 76, 82; 274, 276, 282, 292,

294, 296) for cooling the core (48; 148) is provided.

2. Stator for a linear motor or linear generator according to claim 1, wherein the core (48; 148) is designed as a plate pack made of ferromagnetic plates (66, 68; 266, 268), characterized in that at least part of the plates (66, 68 ; 266, 268) is designed as cooling fins (66; 266), each of which has at least one coolant channel recess (82; 182) which extends at least in sections in the fins plane and is surrounded at least in the fins plane by fin material (84; 284).

3. Stator according to claim 2, characterized in that another part of the fins

(66, 68; 266, 268) is designed as a solid core fins (68), the core fins (68) having at least one connecting opening (70, 72; 270, 272) for supplying or removing coolant to the cooling fins (66; 266) or have away from them.

4. Stator according to claim 2 or 3, characterized in that the at least one Coolant channel recess (82; 282) is designed as an elongated hole (82) or elongated groove.

5. Stator according to claim 4, characterized in that the elongated hole (82; 282) or the

Long groove in the lamella plane is angled several times, preferably meandering.

6. Stator according to one of claims 2 to 5, characterized in that the at least one

Lamella section (84; 284) surrounding the coolant channel recess (82; 282) is formed at least in sections to fix the cooling lamella (66; 266) in the disk pack.

7. Stator according to claim 6, characterized in that the lamella section (84; 284) surrounding the at least one coolant channel recess (82; 282) has at least one nose (86; 28) projecting into the at least one coolant channel recess (82; 282).

286) with a through opening (49; 249).

8. Stator according to one of claims 2 to 7, characterized in that the coolant path in the stacking direction (S) of the plate pack is at least partially meandered through the core (48; 148).

9. Stator according to claim 8, characterized in that in the core (48; 148) in

The stacking direction (S) of the fin package cooling fins (66) are arranged between core fins (60, 62, 64, 68; 260, 262, 264, 268) and the at least one connection opening (272) a first core lamella (268) with respect to the at least one connecting opening (292) of a second core lamella (at 262) immediately following in the stacking direction (S) of the lamella package, which is separated from the first core lamella (268) by at least one cooling lamella (266) is arranged offset in a slat plane direction, preferably essentially in the slat longitudinal direction, particularly preferably towards opposite end regions of the core (48; 148).

10. Stator according to claim 9, characterized in that in the core (48; 148) in the stacking direction (S) of the lamellar core core lamellar sub-packages (60, 62, 64; 260, 262, 264) are provided, the at least one Connection opening (70, 72; 270, 272) from

Core lamellae (68; 268) of a core lamella subpackage (60; 260, 262) form at least one through channel (74, 76; 274, 276, 292, 294).

11. Stator according to one of the preceding claims, characterized in that in the core (48) coolant channel recesses (82) of cooling fins (66) are arranged at least in sections in fluidic parallel connection.

12. The stator according to claim 11, characterized in that core laminations (68; 268) each have at least two connecting openings (70, 72; 272, 274), at least one (72) as coolant supply and at least one further (70) as coolant discharge -

Connection opening is provided.

13. Stator according to one of claims 2 to 12, characterized in that the core (48; 148) comprises cooling lamella subpackages.

14. Stator according to one of claims 2 to 13, characterized in that cooling fins (66; 266) and

Core lamellae (68; 268) have the same thickness and preferably the same material and are particularly preferably made from the same lamella blanks.

15. Stator according to one of the preceding claims, characterized in that the winding coils (22; 122) surround the core (48; 148) in such a way that their respective winding planes (WE) are oriented essentially orthogonally to the core longitudinal direction (L), preferably between adjacent winding coils (22; 122)

Pole toothed disks (24; 124) are arranged.

16. Stator according to claim 6 or 7, if desired with further

Features according to one of the preceding claims, characterized in that the core (48; 148) at least one through opening (49, 50; 149) penetrated by a clamping means (52, 26; 152, 126), such as a screw-nut combination , 150; 249, 250).

17. Stator according to one of the preceding claims, characterized in that at least one stator foot (26; 126) is mounted on the core (48; 148).

18. Stator according to claim 16 and 17, characterized in that the clamping means (52, 26; 152,

126) of a the core (48; 148) essentially in

Stacking direction (S) penetrating head screw (52; 152) and the stator foot (26; 126) is formed, in which the Cap screw (52; 152) is screwed in.

19. Stator according to one of claims 2 to 18, characterized in that on the core (48; 148), preferably via core lamella connecting openings (74, 76;

274, 276), at least one coolant supply and at least one coolant discharge line is connected.

20. Stator according to claim 19, if desired with further features according to one of the preceding claims, characterized in that a structural unit (20; 120) made of core (48; 148), winding coils (22; 122), preferably at least one stator foot (26; 126), at least one coolant supply line (32; 132) and at least one coolant discharge line (34; 134), preferably including pole tooth disks (24; 124), surrounded by a stator housing (12; 112) and in this by hardened casting compound (56; 156 ) is set.

21. Stator according to claim 20, characterized in that the stator housing (12; 112) is formed by a stator shell (14; 114) and a stator shell cover (16; 116) covering it.

22. The stator according to claim 21, characterized in that the stator housing (12; 112) with at least one strain relief device (28, 30; 128, 130), for the at least one coolant supply line (32; 132) and the at least one coolant discharge line (34 ; 134), and / or the electrical lines are provided.

23. Stator according to one of claims 20 to 22, characterized in that the cured casting compound (56; 156) connects the structural unit (20; 120) at least in sections to inner wall regions (14c, 14e) of the stator housing (12; 112), the occupancy taken up by the structural unit (20; 120) and the hardened casting compound (56; 156) Space volume is smaller than the interior volume delimited by the stator housing (12; 112), so that in the interior of the stator housing (12; 112) there is a free space (42, 42a, 42b, 42c; 142) as a flow space (42, 42a, 42b, 42c) ; 142) remains for a coolant through which a coolant can be passed.

24. The stator according to claim 23, characterized in that cooling sections (22a, 22b, 22c; 122a) of the winding coils (22; 122) protrude into or pass through the flow space (42, 42a, 42b, 42c; 142) such that they can be brought into contact with the coolant.

25. The stator according to claim 24 with reference to claims 21 and 15, characterized in that a rotor-near side of the core faces the bottom (114d) of the stator shell (114) and a rotor-far side of the core of the stator shell opening (15; 115), wherein Casting compound (56; 156) is filled in from the bottom (114d) of the stator shell (114) to a height (H) below the stator shell opening (115) in such a way that in each case at least a part of the core (148) which is remote from the rotor Winding coil sections (122a) form the cooling sections (122a).

26. Stator according to one of claims 20 to 25, characterized in that the core (148) at all of its

Long sides, preferably also on its end faces, is surrounded by casting compound (156).

27. Stator according to one of claims 20 to 25, characterized in that the casting compound (56) is applied only in a region of the inner walls (14c, 14e) of the stator housing (12) close to the wall, so that at least part of the inner walls (14c, 14e) of the stator housing (12) pointing winding coil sections is wetted by casting compound (56) and at least part of winding coil sections (22c) pointing towards the core (48) or / and of winding coil sections (12c) between the inner walls (14c, 14e) of the stator housing (12). 22a) as cooling sections

(22a, 22c) protrudes into or passes through the flow space (42c).

28. Stator according to one of claims 20 to 27 with reference to claim 17, characterized in that the at least one stator foot (26) has a section (58) of reduced cross-section in the region of the flow space (42a).

29. Stator according to one of the preceding claims, characterized in that between adjacent winding coil sections running along the core

Winding coils (22; 122), pole tooth disks (24; 124) are arranged, which have passage openings (25 ") and / or form passage openings (25, 25 ') with the stator housing (12) or / and with the core (48).

30. Stator according to claim 29, characterized in that at least one passage outer edge section (24e, 24e ') of the pole toothed disks (24) one

Passage inner wall section (14b, 14b ') of the stator housing (12) is opposite at a distance, the passage outer edge section (24e, 24e') being more adjacent with respect to the latter Outer edge sections is reset or / and a radius of curvature of the passage outer edge section (24e, 24e ') has a different value than a radius of curvature of the passage inner wall section (14b, 14b ").

31. Stator according to claim 29 or 30, characterized in that at least one passage inner edge section (24a) of the pole tooth disks (24) opposite passage outer wall sections of the core (48), the passage inner edge section (24a) with respect to this adjacent outer edge sections is reset or / and a radius of curvature of the passage outer edge section has a different value than a radius of curvature of the passage inner wall section.

32. Stator according to one of the preceding claims, characterized in that the coolant is liquid, preferably a cooling oil.

33. Stator according to one of the preceding claims, characterized in that at least a part of the pole toothed disks is provided with at least one coolant path for cooling the toothed disk.

34. Stator according to claim 33, characterized in that the coolant path is formed by an outer groove (24a, 24b) of the pole toothed disks (24).

35. Stator according to one of the preceding claims, in particular with reference to claim 23, wherein one

Assembly of core, winding coils, preferably including pole tooth disks, surrounded by a stator housing and fixed in it by hardened casting compound, characterized in that the casting compound comprises an adhesive, preferably an adhesive, which is provided between at least one inner surface section of the stator housing and at least one outer surface section of the assembly opposite this inner surface section in the interior of the stator housing.

36. A method for cooling a stator for a linear motor or linear generator, comprising: - a core (48; 148), and a plurality of winding coils (22; 122), each having at least one winding coil section on at least one side of the core (48; 148 ) are facing, characterized in that the method comprises the step of a

Passing coolant through the stator, in particular through the core.

37. Method for producing a stator with a stator housing and with a stator assembly provided in the stator housing and adhesively connected to it by hardened casting compound, the space volume occupied by the stator assembly and the casting compound being smaller than the interior volume delimited by the stator housing, in particular for production of a stator according to one of claims 1 to 35, in particular with reference to claim 23, the method comprising the following steps: a) inserting the stator assembly into the stator housing, b) pouring casting compound into the stator housing, c) sealing the stator housing if desired, d) Orienting the stator housing with the stator assembly in such a way that the filled and still flowable Casting compound wets a desired inner surface area of the stator housing under the influence of gravity, and e) allow the casting compound to harden, and f) repeat steps b) to e) if desired.

38. Method of manufacturing a stator with a

Stator housing and with a stator assembly provided in the stator housing and adhesively connected to it by hardened casting compound, which of the

Stator assembly and the casting volume occupied space is smaller than the interior volume delimited by the stator housing, in particular for producing a stator according to one of claims 1 to 35, preferably a stator according to claim 25, the method comprising the following steps:

Applying casting compound, in particular adhesive, to at least one of the surface areas:

Inner surface area of the stator housing and outer surface area of the stator assembly, in particular of at least one of the components of the stator assembly: winding coils and pole toothed disks, insertion of the stator assembly into the stator housing and curing of the applied casting compound, in particular of the applied adhesive, if necessary carrying out steps b) to f) of the claim 17th