WO2010108509A1

WO2010108509A1 - Electric linear drive

Info

Publication number: WO2010108509A1
Application number: PCT/EP2009/002175
Authority: WO
Inventors: Daniel Graf
Original assignee: Trumpf Werkzeugmaschinen Gmbh + Co. Kg
Priority date: 2009-03-25
Filing date: 2009-03-25
Publication date: 2010-09-30

Abstract

The invention relates to an electric linear drive for producing linear movements along a predetermined axis of movement. The electric linear drive comprises a stator assembly (12) and a rotor assembly (18) which can be moved relative to the stator assembly (12), the rotor assembly (18) being designed as at least one strip-type and deflectable rotor (19), and the stator assembly (12) having at least one base (14) and a plurality of coil elements (16) arranged in the base (14) and aligned in the base (14) to produce a direction of movement along the predetermined axis of movement of the rotor (19). The at least one base is associated with at least two deflection elements (22) of a deflector (21) by means of the which the rotor (19) is at least partially guided along the base (14) and forms at least one first region of overlap (42) with the base (14). The rotor (19) has at least one coupling element (24) for transmitting a linear movement onto a load to be moved.

Description

Electric linear drive

The invention relates to an electric linear drive for generating rectilinear movements along a predetermined axis of movement.

From DE 203 16 493 Ul a linear drive is known, which is provided with a stator assembly (secondary part) and a rotor assembly (primary part), which are movable relative to each other. The stator assembly includes a U-shaped housing having two parallel legs connected together by a connecting leg. Magnets for forming a magnetic field, which form the stator assembly, are respectively provided on the two parallel aligned limbs. The runner is provided with at least one ironless winding, which lies in a gap between the two legs. none of the housing is located. In addition, the rotor has a drive-side extension for attachment to a load to be moved. By such an arrangement, a high dynamics should be achievable, since the moving mass of the rotor with the coils arranged therein is low.

Such arrangements have the disadvantage that the force to be generated for moving a load is limited by the size of the rotor in the stator. In most cases, small runners are provided in the length, so that the relatively long-trained stator housing allows the largest possible stroke. This in turn requires only a small driving force to move a load or it requires a corresponding size to produce large driving forces. In addition, the cable routing for power supply is complicated and disadvantageous.

The invention is therefore an object of the invention to provide an electric linear motor, the same dynamic properties or with the same space allows correspondingly higher driving forces with a small volume.

This object is achieved by an electric linear drive according to the features of claim 1. Further advantageous embodiments and further developments are specified in the further claims.

Due to the design of the rotor assembly with a band-shaped and deflectable rotor and a stator assembly having at least one main body with a plurality of bobbins, which are aligned to generate a direction of movement along a predetermined axis of movement of the rotor to the base body and with at least two deflections a deflection device, which are associated with the base body, so that at least a first overlap region between the rotor and the base body is formed, is allowed during the traversing movement of acting on a load coupling element remains a constant length of the overlap region, so that a permanently acting area- che is present for the generation of the drive movement of the rotor. This allows a much higher driving force with the same space for moving a load can be achieved, as is the case with a device according to the above-mentioned prior art, since the permanently available coverage area is larger than a conventional runner whose size is made the length of the rotor results, but which is much smaller than the controllable travel distance of the linear drive. It can thus be achieved with the same driving force a reduced space, creating increased flexibility in the application is created. Such an arrangement allows a compact design, wherein the length of the drive path is determined by the distance between two deflections and a base body extending therebetween or adjacent thereto.

A further preferred embodiment of the linear drive provides that the rotor is guided by the deflection at least partially along the base body and is transferred into a further overlap region by the direction of movement of the rotor is opposite to the first overlap region. As a result, it can be effected, for example, that in the case of a plate-shaped main body, a first overlapping region which is formed along one end face can also be formed on the opposite end face. As a result, the permanently acting surface is doubled to generate a driving force on the rotor. This allows a further reduction of the installation space. Alternatively, an increase in the driving force can be achieved with the same space.

According to a further preferred embodiment of the invention, it is provided that the rotor has a plurality of spaced-apart permanent magnets, which are inserted or integrated. These can be introduced during the manufacturing process. Likewise, the permanent magnets can be subsequently arranged by an adhesive, Klemmoder locking connection or the like on the rotor.

According to a further preferred embodiment of the invention it is provided that the rotor formed as a link chain or as a link belt is, in which two adjacent chain links are pivotally connected together by a bearing axis. This arrangement allows a simple adaptation of the rotor to the length of the base body or the distance of at least two deflection devices to each other. The design of a link chain is a modular structure of a band with two ends or an endless belt created. Such a runner can work both on the train principle and on the push principle.

According to a further preferred embodiment of the invention it is provided that the chain links of the link chain are arranged without play to each other. For example, preloaded bearings can be used in the event that the chain links of the link chain operate on the train principle. This is intended to provide as exact a control as possible in the event of a change of direction in the direction of movement in order to drive a load.

On the rotor, in particular on the bearing axis or on the chain link of the rotor, at least one guide element is preferably provided, which acts on at least one guide and, for example, endless belt or chain link leads at a defined distance to the main body of the stator assembly. This defined distance is decisive for inducing a driving force in the rotor assembly as a function of the bobbin and the materials used for the rotor and / or the permanent magnet optionally arranged thereon and can be kept constant by the arrangement of the guide elements along a drive path.

The guide of the guide elements is preferably arranged on the at least one main body of the stator assembly. In particular, this can be integrated, so that a structurally simple design is given. In particular, this guide is designed as a running or sliding surface. As a result, a low-friction guidance can be achieved, which counteracts only slightly the maximum drive force or the force for moving a load. Furthermore, it is preferably provided that the at least one guide element is designed as a roller or plain bearings. The guide elements are preferably adapted to the guide, so that correspondingly low-friction pairings are selected. For example, the guide element may be formed as a roller bearing, which rolls on a tread. Alternatively, plain bearings can be provided. The guide element, which is designed, for example, as a roller or roller bearing, is preferably fastened to the bearing axis, as a result of which a component-reduced arrangement is provided.

According to a further preferred embodiment of the invention, it is provided that the deflection device has a deflection roller, guide roller or semicircular guide as deflection. Such deflection devices may preferably correspond in diameter to the thickness of an adjacent base body of the stator assembly, so that, for example, an upper and lower track section of the rotor is guided parallel to the base body. Furthermore, a setting for the belt tension is preferably made possible by a belt tensioning device, provided that the runner operates in the train principle. In addition, occurring length changes that occur, for example, due to acceleration processes and thus traversing speed changes of the rotor can be compensated. Such a belt tensioning device can be provided as a continuous belt or a non-closed belt both in the embodiment of the rotor as an endless belt and in the embodiment of the rotor. In the embodiment of a continuous belt can be provided, for example, that a guide roller is provided directly on an end face of the body and an opposite guide roller outside the range of the body, so that the rotor is guided parallel to the body, but in the opposite direction to the further guide roller Runner deflects. Thereby, a kind of Z-shaped guide can be achieved along the base body, in which both sides of the base body covering areas are formed, which generate a driving force in the same direction. In addition, such a belt tensioning device may be provided in the latter embodiment in an up or unwinding of the rotor, whereby the Arrangement of the continuous rotor is made possible to the main body.

According to a further alternative embodiment of the invention, it is provided that the rotor can be guided in a gap formed between the main body and a further stator section. Thus, bobbins are provided on both sides of the rotor within the overlap region of the rotor and body along a linear axis of motion coil body, which transmit a driving force to the rotor.

A further preferred embodiment of the invention provides that the rotor, which operates on the thrust principle, loosely arranged chain links, which are provided in a circumferential guide, wherein the guide is provided in a housing which comprises the main body and the stator. As a result, a closed system is formed, which is designed in the form of a compact drive. Moreover, with this arrangement, shielding from the environment with respect to the magnetic flux is possible. In addition, a backlash-free arrangement is made possible by the juxtaposition of the chain links.

It is preferably provided that the runner acting on the thrust principle chain links, which have a convex or concave front end face in the thrust direction, which engages a complementary formed end face of the leading chain link. Preferably, a friction-minimizing coating or a rolling element is provided between the adjacent end faces of the chain links.

A further preferred embodiment of the invention provides that the chain links have a lateral bearing, which is designed as a mechanical bearing or as a magnetic bearing. Depending on the force conditions and the installation volume of such a linear drive, the mechanical or magnetic storage can be selected. In the mechanical storage roller or roller bearings are preferably provided. Alternatively, as well as a slide bearing a corresponding material pairing allows. Due to the alternative embodiment of a magnetic bearing, an air gap between the chain links and the outer guide walls can be given, whereby a frictionless or at least low-friction guidance is possible.

A further preferred embodiment of the invention provides that the rotor, which is formed of a polymer or rubber material and is driven by the thrust principle, is provided in a preferably circumferential guide, wherein the guide at least between the base body and a stator surrounding the body portion is trained. It is preferably provided that the guide is arranged in a housing, wherein the base body and the stator are part of this housing, so that a circumferential guide is given. In this case, provision is made in particular for both the bobbins in the base body and in the stator section to be provided in the straight-line sections of the guide. This arrangement has the advantage that a simple integration of permanent magnets in the rotor is made possible and at the same time a precise thrust drive can be performed. It is preferably provided that such runners are made of polymer or rubber material with reinforcements by fiber inserts, steel inserts, fabric, steel tape inserts or the like.

According to a further preferred embodiment of the formed of polymer or rubber material rotor is provided that this is guided in a guide through a liquid film. This liquid management, in particular oil lubrication, allows a smooth running of the rotor of a polymer or rubber material. Preferably, an oil pressure lubrication is provided.

A further alternative embodiment of the invention provides that, in mirror image to a first overlap region of a first rotor and a first base body, a further overlap region is formed between a further rotor and a further main body, and that the first and further runners move together with one another. are coupled. As a result, it can be achieved that the driving force from a covering area is doubled, so that a double driving force for the movement of an object can be provided. If the first and second runners are designed as revolving endless belt, the driving force can even be quadrupled.

An alternative embodiment of the invention provides that the rotor is formed of a polymer or rubber material. These runners can be operated according to the pulling principle, preferably according to the pushing principle. Preferably, the rotor made of polymer or rubber material is provided as an endless belt, which runs in a guide. Such a rotor also allows a quasi play and deformation-free transmission of forces. Furthermore, such bands can also be provided with permanent magnets, for example, by clipping or gluing them into a recess or even enclosing them during the production process.

According to a preferred embodiment of the liner drive is provided that the rotor is formed as an endless belt and the at least one main body of the stator assembly completely surrounds. As a result, a compact arrangement can be created. In addition, it can thereby be effected that the driving force is doubled by the coil body assigned to an upper side and underside on the main body acting on a band section of the endless belt assigned to the upper side and the lower side of the main body.

According to a further preferred embodiment of the invention, it is provided that cooling is provided in the base body of the stator assembly. This cooling comprises in particular the cooling bodies surrounding cooling coils or cooling coils. As a result, heating of the linear drive during operation is reduced or reduced. For cooling, a flowable medium, in particular air, coolant or water, can be used.

A further preferred embodiment of the invention provides that the guide of the stator assembly, in which the rotor is arranged, is closed by a co-moving cover or has a fixed cover, which is preferably removable. The design of a co-moving cover makes it possible for the guide to be completely closed despite a traversing motion along a provided traversing range. At the same time thereby a restraint of the rotor, which is designed in particular as a rubber band allows. For this purpose, individual chain segments are preferably provided, which are moved in particular during overrun operation. In the alternative embodiment, which provides a fixed cover in the body, substantial portions of the guide may be covered. In particular, in a double guide can be done by the fixed cover, which covers the two guides, a simple and quick installation.

The invention and further advantageous embodiments and developments thereof are described in more detail below with reference to the examples shown in the drawings and explained. The features to be taken from the description and the drawings can be applied individually according to the invention individually or in combination in any combination. Show it:

1 shows a schematic view of an inventively designed linear drive,

Figure 2 is a schematic side view of

Linear drive according to Figure 1,

FIG. 3 shows a schematic detail view of a rotor of the linear drive,

FIG. 4 shows a schematic sectional view along the rotor along the line AA in FIG. 3, FIGS. 5a and 5b show schematic side views of alternative embodiments of the linear drive according to FIG. 1,

FIG. 6 shows a schematic sectional illustration of an alternative embodiment to FIG. 1,

7 shows a side view of the alternative embodiment to FIG. 6 in partial section, FIG.

FIG. 8 shows a schematic side view of a further alternative embodiment to FIG. 1,

FIG. 9a shows a schematic side view of a further alternative embodiment of the linear drive according to FIG. 1,

9b is a schematic sectional view of the guide of the linear drive according to FIG. 9a, FIG.

10a and 10b is a schematic side and sectional view of an alternative embodiment of a chain link according to an alternative linear drive in Figure 9,

FIGS. 11a and 11b show a schematic side and sectional view of an alternative embodiment of a chain link according to an alternative linear drive in FIG. 9, FIG. 12 shows a schematic side view of a further alternative embodiment of the linear drive according to FIG. 1,

13 shows a schematic sectional view along the line XIII-XIII of the linear drive according to FIG. 12, FIG.

Figures 14a and 14b is a schematic side and sectional view of a closure element of an alternative linear drive according to Figure 12 and

FIGS. 15a and 15b show a schematic side and sectional view of a further alternative embodiment of the linear drive according to FIG. 1.

In the figures 1 and 2, a schematic plan view and side view of an electric linear drive 11 according to the invention is shown. The linear drive 11 comprises a stator assembly 12, which comprises a main body 14 with coil bodies 16 arranged therein. Furthermore, the linear drive 11 comprises a rotor group 18, which comprises at least one rotor 19, which is formed band-shaped and deflectable. By way of example, this rotor 19 is designed as an endless belt. For deflecting the rotor 19, at least two deflections 22 arranged at a distance from one another are provided, which form a deflection device 21. The deflections 22 are preferably formed as rollers and may have an axial mobility to achieve a belt tension. In the embodiment according to FIGS. 1 and 2, the deflections 22 are each assigned to one end face of the main body 14. The main body 14 can be fastened by means not shown in detail on a machine frame, brackets or the like. Likewise, electrical connections are provided on the main body 14 or electrical lines are arranged. net, which are not shown in detail to supply the bobbin 16 with electrical energy.

At least one coupling element 24 is provided on the rotor 19 so that the movement of the rotor 19 can be transmitted to a load to be driven or to an element to be moved or an object 26 to be moved, which is shown symbolically.

Such a drive can work on the push and pull principle. These drives have in common that the stationary components as a stator assembly, which preferably comprises bobbin, are energized and the moving components, ie rotor assemblies, which preferably comprises permanent magnets are de-energized. As a result, a simplification in the structure can be achieved.

The rotor 19 in Figure 2 is shown schematically simplified as a band. The rotor 19 consists according to Figures 3 and 4 of a plurality of chain links 28 which are arranged by a common bearing axis 29 hinged and pivotable to each other. In this case, for example, it is provided that a first chain link 28 has on one end side a central web 31 with a through-bore 32, wherein the central web 31 can be inserted into a U-shaped recess 33 of an adjacent chain link 28, wherein leg sections 34 of the U-shaped recess likewise have through bores 32, so that a bearing axis 29, the two chain links 28, preferably without play, such as by a preloaded bearing, can connect to each other. This arrangement shown in Figures 3 and 4 is only exemplary. Other alternative connections and arrangements of chain links to each other may also be conceivable depending on the applications.

In a central portion of the chain link 28, a receiving portion 36 is provided, in which at least one permanent magnet 37 is used or integrated therein. The receiving space 36 allows a magnetic reflux. The permanent magnet 37 preferably extends over the entire width of the chain link 28. The distances of Receiving areas 36 of the respective chain links 28 to each other are coordinated, so that regular intervals are provided. As an alternative to the embodiment of a chain link 28 shown in FIGS. 3 and 4, it is also possible to provide a one-part component in which the permanent magnet 37 is enclosed in the chain link 28 or integrated or attached thereto.

At the respective outer end of the bearing axis 29, a guide element 39, in particular a roller bearing, is preferably provided, which rests and rolls on a guide 41 (FIG. 6). The guide 41 is preferably provided on the base body 14 or releasably secured thereto by a separate component.

In the embodiment illustrated in FIGS. 1 to 4, it is provided that the drive path for producing a driving force for the rotor 19 extends over the entire length of the base body 14 in the movement axis of the rotor 19 or through the overlapping region 42 formed thereby. Consequently, in a relatively small-sized unit still a large drive surface can be achieved in the rotor 19, in particular, since on an upper and underside of the base body 14, the formation of an overlap region 42 for generating the driving force is made possible. Alternatively, the overlapping region 42 may also be formed only on the top or bottom of the main body 14. If a cover region 42 is formed on both sides of the main body 14, a shield can be integrated between the row of the coil former 16 on the upper side and the row of the coil former 16 on the underside of the main body 14. By this basic arrangement can also be provided that very narrow installation space can be used, in which the base body 14 is extended by the reduction of the width of the rotor 19 in order to achieve the same surface area between bobbin 16 and rotor 19 for the required driving force ,

FIGS. 5a and 5b show alternative arrangements of a linear drive 11. According to Figure 5a, the base body 14 may be formed for example T-shaped and the rotor 19, the T-shaped Surrounding the embodiment of the base body 14. By deflections 22 is made possible that the rotor 19 is held with a predetermined gap to the base body 14. In addition, guide elements 39 may be provided on the rotor 19. The drive path a is formed for example by the lying in a horizontal plane deflections 22, wherein the drive power is formed by the overlap region 42. By the additional additional coverage areas 42 of the T-shaped base body 14, the drive power is increased.

The geometric configuration of the main body 14 can be done in many ways. FIG. 5b shows, for example, a further alternative embodiment. The deflections 22 are aligned, for example, in a triangle to each other. This embodiment and geometry of the base body 14 has an otherwise identical structure of the linear drive 11 according to Figure 1 and 2 on an increased driving force.

FIG. 6 shows a schematic sectional view of an alternative embodiment of a rotor 19 to FIGS. 3 and 4. In this embodiment, instead of a link chain, a continuous band 52 made of a polymer material, provided as a composite material of fiber-reinforced drawstrings with sheaths of plastic or the like, which receives permanent magnets 37. Furthermore, a bearing shaft 29 is preferably provided with guide elements 39 arranged thereon. The bearing axle 29 is fastened to the belt 52 via a bearing housing 30 or a bearing receptacle. The bearing housing 30 simultaneously provides a transverse stiffening of the belt 52, whereby a constant distance from the main body 14 can be achieved. The guide elements 39 are supported on the guide 41. The guide 41 is preferably provided on the base body 14. These guide elements 39 can also be omitted with a corresponding design of the band 52, so that via the belt 52, the guide to the base body 14 takes place and thereby a constant distance between the permanent magnet 37 and the bobbins 16 in the base body 14 is maintained. On the belt 52, a coupling element 24 is attached be transferred to the movement of the linear drive 11 to the moving load or object 26.

FIG. 7 shows a further schematic sectional view of the alternative embodiment in FIG.

FIG. 8 shows a further alternative embodiment of the linear drive 11. In this embodiment, a stator portion 54 is provided parallel to the base body 14 and spaced therefrom, which is associated with the rotor 19 and has a plurality of coil bobbins 16. The rotor 19 may be formed in this embodiment with permanent magnets 37 and 37 without permanent magnet. In this embodiment, the stator assembly 12 includes both the bobbins 16 in the body 14 and the stator portion 54.

A further preferred embodiment of the invention, not shown, provides that the stator assembly 12 and the rotor assembly 18 are formed as a unit or module unit. This arrangement allows for easy integration into a machine concept for moving a load or component. As a result, a prefabricated module with defined interfaces can be provided. The unit is completely encapsulated, for example. Thus, when using magnets can be given a shield of the drive unit. The encapsulation preferably comprises a longitudinal slot through which protrudes a coupling element 24 which is connected to the rotor 19 in order to move the load. This slot can preferably also be designed to be closable.

According to an advantageous embodiment of the invention it is provided that the rotor 19 is formed magnetically free. In particular, in the passage of the rotor 19 through a gap formed by the base body 14 and the stator 54, a magnet-free configuration of the rotor 19 may be provided. The drive of the rotor 19 is carried out according to the principle of asynchronous motors. FIG. 9a shows a further alternative embodiment of the linear drive 11. In this embodiment, it is provided that the rotor 19 is provided as a circulating belt or as an endless belt, wherein the rotor 19 is guided in a guide 56 according to Figure 9b. This guide 56 is provided in a housing 61 or housing part and extends in sections between the main body 14 and the stator 54. The stator 54 and the base 14 are preferably part of the housing 61 or form the housing 61. The guide 56 is completely circumferential and closed educated. The deflection device 21 with its deflections 22 is preferably integrated in the housing 61. According to the exemplary embodiment in FIG. 9 a, the rotor 19 has a plurality of individual chain links 28, which comprise permanent magnets 37 on their top and bottom sides. At a front end face 57 of the chain link 28, for example, a convex end face 57 is provided, which acts on a complementary end face 58 of the leading chain link 28. Thus, this end face 58 is concave. As a result, a secure abutment and intermeshing of the chain links 28 as well as an arrangement of the chain links 28 that can be changed in the deflection radius relative to one another can be created. The push chain links have the advantage that they lie against each other without backlash and allow for a direction reversal exact control.

The guides 56 according to FIG. 9b have, for example, one or more sliding elements 53 which position the chain links 28 within the guide 56. Due to the geometric configuration of the guide 56 and / or the sliding elements 53, an air gap 55 between the base body 14 and arranged on the chain links 28 permanent magnet 37 can be adjusted. The sliding elements 53 can take over the guidance of the chain links 28 depending on a lying or vertical arrangement of the linear drive 11 in an application-specific manner only in the Z or X direction or at the same time take over the guidance in the Z and X directions, as shown in FIG. 9b.

Due to the arrangement of the main body 14 and stator section 54 and the respective coils 16 to the guide 56, a double Über- Covering area 42 can be achieved along a travel distance, as is also provided in Figure 9a. In addition, this arrangement may have the advantage that around the bobbin 16 circumferentially cooling 62 may be provided to prevent or reduce heating during operation of the linear drive 11. In particular, cooling channels or cooling coils can be provided.

FIGS. 10a and 10b show an alternative embodiment for a mechanical mounting of chain links 28 of a rotor 19 according to FIG. 9a. For example, a roller bearing 60, in particular a rolling or ball bearing can be provided, which is rotatably received about a fixed to the chain link 28 or rotatably mounted bearing axis 63 and is guided in a corresponding bearing gap 64 adjacent to the guide 56. Likewise, the bearing gap 64 may also be part of the guide 56. Due to the storage, the chain links 28 are guided with a bilateral air gap 55 in the guide 56.

According to a further preferred alternative embodiment of the guide 56 of the chain links 28 of the rotor 19 according to FIG. 9b or FIGS. 10a and 10b, a magnetic bearing is provided. In the sectional views according to the figures IIa and IIb, the magnetic bearing is shown in more detail. Figure IIa shows a side view of the linear drive 11, wherein the direction of movement of the chain link 28 is to the left. FIG. 11b shows a section through the chain link 28 and the guide 56. Over the width of the chain link 28, three magnets 37, 38 are provided, for example, on each longitudinal side. The two outer guide magnets 38 in the rotor 19 opposite guide magnets 38 are provided in the base body 14 and in the stator section, which together with the outer guide magnet 38 of the rotor 19 form the magnetic bearing. The middle permanent magnet 37 in the chain link 28 is arranged opposite a bobbin 16 in the base body 14 and the stator section 54, whereby the drive takes place. The number and arrangement of the guide magnets 38 for magnetic bearing and the number of bobbins 16 and the associated Neten permanent magnet 37 may be designed according to the application example.

FIG. 12 shows a further alternative embodiment of the linear drive 11. 13 shows a sectional view along the line XIII-XIII in Figure 12 of the linear drive 11. In this embodiment, the rotor 19 operates on the thrust principle. Preferably, a rubber belt or a rotor 19 is provided from a polymer or rubber material, which is provided in a circumferential guide 56. The rotor 19 preferably receives the permanent magnets 37. For example, these can be inserted, glued or pressed during the production of the rotor 19. This rotor 19 is preferably provided in a closed guide 56, which is completely closed by a cover 66. As a result, a clamping of the belt 52 is achieved. At the same time a liquid lubrication 71 or liquid storage, in particular oil pressure lubrication, of the rotor 19 may be provided in the guide 56. This allows a smooth running and reduces the friction between the rotor 19 and guide walls of the guide 56. This also the generation of frictional heat can be prevented.

The cover 66 is formed by moving chain segments 68 and shown in more detail in Figures 14a and 14b. The co-moving chain segments 68 have a guide segment 59, which serves to guide the chain segment 68 in the base body 14 and close the unilaterally open guide 56 and in particular to form a support surface for the endless belt during the pushing operation. The guide segments 59 may be formed as a groove or otherwise having in the geometry of undercuts. The chain segments 68 have a convex end face 57, on which engages a concave end face 58 of the following chain segment. This allows a simple diversion and a simple overrun operation are possible. Preferably, a friction-minimizing coating or a rolling bearing between two chain segments 68 may also be provided in these chain segments 68. In Figure 15a is a schematic side view of another alternative embodiment of the linear drive lldargestellt. This arrangement operates on the thrust principle, wherein the first rotor 19 a mirror image of a second rotor 19 'is arranged, so that a double belt drive is made possible. Both runners 19, 19 'are arranged adjacent to one another in the region of the mirror axis and preferably coupled to one another in a motion-coupled manner. Thus, a load can be moved in particular by the coupling element 24. Due to this arrangement of the first and second rotor 19 according to the double belt principle, a sixfold driving force can be achieved along the travel distance between the rotor 19 and the main body 14, since a total of six overlap regions 42 provide a driving force for the coupling element 24. It is provided that along the trajectory each a coverage area 42, 42 'of the rotor 19, 19' is provided. Opposite in each opposite direction of movement and parallel running 19 two overlap areas 42 and the runner 19 'two overlap areas 42' are formed in the rotor. This is based on the fact that the stator section 54 or 54 'can be formed on both sides of the rotor, whereas in the motion-coupled region of the rotor along the travel path only one stator section 54, 54' in the rotor 19, 19 'can be assigned. Furthermore, it is alternatively also possible that the two runners 19, 19 ', which are connected to the coupling element 24, have a small distance from each other, so that between the runners 19, 19' along the travel distance also still a stator 45, 45 ' can be trained.

FIG. 15b shows a schematic sectional illustration of the linear drive 11 according to FIG. 15a. It is provided that the base body 14 and the stator 54 are arranged in the common housing 61, wherein the guide 56 are formed by two U-shaped depressions in the housing 61. Via a cover 69, both guides 56 are preferably closed, wherein in the cover 69, a slot opening 67 is provided through which the coupling element 24 is led out. This embodiment also allows the double band principle both in the embodiment according to FIG. 9a and their alternatives as well as by the embodiment of Figure 12 can be realized. The slot opening 67 can be formed closed by a sliding closure. In this case, an analog arrangement, as described in Figures 14a and 14b, may be provided.

Claims

claims

An electric linear actuator for generating rectilinear movements along a predetermined axis of motion with a stator assembly (12) and a rotor assembly (18) movable relative to the stator assembly (12), characterized

the rotor assembly (18) is designed as at least one belt-shaped and deflectable rotor (19),

in that the stator subassembly (12) has at least one main body (14) and a plurality of bobbins (16) arranged in the base body (14), which are aligned along the predetermined axis of movement of the rotor (19) in the base body (14) in order to generate a driving force are,

in that the at least one main body (14) is assigned at least two deflections (22) to a deflecting device (21) through which the rotor (19) is guided at least partially along the main body (14) and at least one first overlapping region (42) to the main body ( 14), and

the rotor (19) has at least one coupling element (24) for transmitting a linear movement to a load to be moved.

2. Linear drive according to claim 1, characterized in that the rotor (19) through the deflection (22) at least partially along the base body (14) is guided and in a further overlapping region (42) is converted, in which the direction of movement of the rotor ( 19) opposite to the first covering area (42).

3. Linear drive according to one of the preceding claims, characterized in that the rotor (19) a plurality of at a distance has arranged to each other permanent magnets (37) which are inserted or integrated in the rotor (19) or applied or fixed on the rotor (19).

4. Linear drive according to claim 1 or 2, characterized in that the rotor (19), which preferably operates on the train principle, as a link chain with a plurality of chain links (28) is formed, in which two spaced-apart chain links (28) by a bearing axis ( 29) are pivotally connected to each other, which are preferably arranged without play to each other.

5. Linear drive according to claim 3, characterized in that on the rotor (19), in particular on the bearing axis (29) or on the chain link (28) at least one guide element (39) is provided, which acts on at least one guide (41) and the rotor (19) leads at a defined distance from the base body (14) of the stator assembly (12).

6. Linear drive according to claim 4, characterized in that the guide (41) on the base body (14) of the stator assembly (12) is arranged and is preferably designed as a running or sliding surface and that the guide element (39) at least one rolling or sliding bearing which is preferably provided on the bearing axis (29).

7. Linear drive according to claim 1, characterized in that at least one deflection (22) of the deflection device (21) has a diameter which is at least slightly larger than a tangential to the deflection (22) associated end face of the base body (14).

8. Linear drive according to claim 1, characterized in that the rotor (19) can be guided in a gap formed between the base body (14) and a further stator section (54).

9. Linear drive according to one of the preceding claims, characterized in that the rotor (19), which operates on the thrust principle, loosely arranged chain links (28), which are provided in a guide (56), wherein the guide (56) is provided in a housing (61) which comprises the base body (14) and the stator section (54).

10. Linear drive according to claim 9, characterized in that the working according to the thrust runner (19) chain links (28) which in the thrust direction, a convex or concave front end face (57) formed on a complementary end face (58) attack leading chain links (28) and in particular between them have a friction-minimizing coating or rolling bearing.

11. Linear drive according to claim 9 or 10, characterized in that the chain links (28) have a lateral bearing, which are designed as a mechanical bearing, in particular roller bearing or plain bearing, or as a magnetic bearing.

12. Linear drive according to claim 1 or 2, characterized in that the rotor (19) is formed of a polymer or Gummiwerkstoff-.

13. Linear drive according to claim 12, characterized in that the rotor (19), which is formed from polymer or rubber material and works on the thrust principle, is provided in a guide (56), wherein the guide (56) through the base body (56). 14) and the base body (14) surrounding the stator (54) is formed.

14. Linear drive according to claim 12, characterized in that the rotor (19) is mounted in the guide (56) in a liquid film, in particular in a pressurized oil film.

15. Linear drive according to one of the preceding claims, characterized in that a mirror image of the first overlap region (42) of a first rotor (19) and a first base body (14), a further overlap region (42) between a second rotor (19 ') and a second Base body (14 ') is formed and the first and second runners (19, 19') are coupled to each other motion.

16. Linear drive according to claim 1, characterized in that the rotor (19) is designed as an endless belt and the at least one base body (14) of the stator assembly (12) completely encloses.

17. Linear drive according to one of the preceding claims, characterized in that in the base body (14) cooling (62), in particular the bobbin (16) surrounding cooling channels is provided.

18. Linear drive according to one of the preceding claims, characterized in that the guide (56) for receiving at least one rotor (19) by a co-moving cover (66) or a fixed cover (69) is closed, and preferably the rotor (19 ) is clamped by the cover (66) in the guide (56).