Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K1/00—Details of the magnetic circuit
  • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
  • H02K1/12—Stationary parts of the magnetic circuit
  • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
  • H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K1/00—Details of the magnetic circuit
  • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
  • H02K1/12—Stationary parts of the magnetic circuit
  • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K1/00—Details of the magnetic circuit
  • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
  • H02K1/22—Rotating parts of the magnetic circuit
  • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures

Definitions

• the invention relates to an electric machine, in particular an electric motor with a rotor and a shaft.
• the invention relates to the field of electric motors for motor vehicles, in particular serving as electrical auxiliary drives electric motors for power-operated adjustment or the support of an adjustment of elements of a motor vehicle.
• Rotors can be constructed from one or more disk packs or from individual laminations and other components.
• the lamellae or disk packs are pushed axially onto the shaft, so that they directly adjoin one another.
• the electric machine according to the invention with the features of claim 1 and the electric machine according to the invention with the features of claim 14 have the advantage that an improved mounting of the rotor on the shaft or the stator is made possible in the housing part. Specifically, a relatively inexpensive production can be made possible, in which the desired radial centering of the disk set of the rotor or the disk set of the stator is ensured to the shaft of the electric machine.
• the resilient approach nose-shaped is trained.
• the nose-shaped projection can be slightly bent during assembly, resulting in a reliable radial centering and also allows a certain bias in a radial direction.
• a nose-shaped projection can be designed so that when joining the disk pack on the shaft or the disk pack in the housing part locally comes to a very high surface pressure, whereby a notch is formed on the shaft and thereby locally in addition to the non-positive connection a form-fitting Connection occurs. This allows a reliable attachment with a correspondingly high connection force.
• the connection can then serve for positioning and fixing.
• one or more resilient lugs are formed on a plurality of lamellae of the lamella packet, wherein in an axial direction, a clearance is provided behind a resilient projection, whereby a certain bending of the resilient lug is made possible during assembly.
• the spring force applied by the resilient approach preferably acts so that the centering shoulder is acted upon in the direction of the shaft or on the housing part in order to ensure a reliable radial centering of the disk set relative to the shaft.
• the centering shoulder is designed with a play or transition fit to the shaft or the housing part. This can do that Disc pack simply applied to the shaft or be introduced into the housing part. In the case of a certain, low positive overlap to the shaft or the housing part, an elastic configuration of the centering can also be made to facilitate assembly.
• the shaft is advantageous for the shaft to be infinitely variable, at least in one area of the disk pack, or for an inner surface of the housing part to be infinitely variable, at least in one area of the disk pack.
• the resilient approach or the resilient lugs allow a frictional connection, possibly also a positive connection in which a shoulder on the shaft or the housing part for attachment in the axial direction is not required, so that a simplified and thus cost-effective design of the shaft or the housing part is possible.
• the resilient projection is configured to have a decreasing width in a radial direction.
• the rigidity in the attachment to the shaft decreases inwards and thus towards the shaft, while the rigidity decreases when mounting on the housing to the outside and thus towards the housing.
• the decreasing stiffness in the radial direction be achieved by an embodiment of the resilient approach, in which a decreasing material thickness is provided in the radial direction.
• a tangential width of the resilient lug decreases in the radial direction.
• the selectively considered stress of the resilient approach is reduced, in particular a point occurring, narrow radius of curvature avoided, and thus increases the security against damage to the resilient approach.
• a tangential position of a plurality of at least substantially successively arranged resilient lugs of a plurality of fins varies.
• the resilient projections when joining the shaft or in the housing claim two or more tracks, so that the risk of chip formation during joining is reduced.
• the tangential position of the resilient lugs of the plurality of fins may be variably configured such that (almost) each of the substantially consecutively arranged resilient lugs has its own track when being mounted on the shaft or in the housing.
• a positive connection is formed between the disk set and the shaft in a circumferential direction. This prevents rotation in the circumferential direction, that is to say about an axis of the shaft, between the disk set and the shaft, so that a reliable connection between the disk set and the shaft is configured in the loading direction which is mainly relevant in operation. Accordingly, it is advantageous that between the disk set of the stator and the housing part in a circumferential direction a positive connection is formed.
• the form-fit formed in the circumferential direction is formed between a lamella of the lamella packet and the shaft.
• the shaft has a recess into which the resilient projection of the blade of the disk set partially engages, so that the positive connection is formed in the circumferential direction.
• a plurality of resilient projections may be provided, wherein one or more resilient projections engage in at least one recess of the shaft.
• the recess in the shaft may be formed specifically by a groove extending in an axial direction in the shaft.
• FIG. 2 shows a lamella of a lamellae pact of a stator together with a housing part of an electrical machine according to a second embodiment of the invention
• FIG. 3 is a simplified, excerpted representation of a section through a disk pack according to a third embodiment for further explanation of the invention.
• FIG. 4 shows a blade of a disk set of a rotor of an electrical machine according to a fourth embodiment of the invention
• FIG. 5 shows the detail, designated by V in FIG. 4, of a lamella of a disk pack of a rotor of an electric machine according to the fourth exemplary embodiment of the invention
• Fig. 6 is a schematic, excerpted representation of a section through a plate pack, which is joined to a shaft, according to the fourth embodiment of the invention.
• Fig. 7 shows a blade of a disk set of a stator of an electrical machine according to a fifth embodiment of the invention.
• Fig. 8 shows a stator with a housing part of an electrical machine according to a sixth embodiment of the invention. Description of the embodiments
• the electric machine 8 can be configured in particular as an electric motor for a motor vehicle.
• the electric machine 8 is suitable for power-operated adjustment of elements of a motor vehicle, for example a sunroof, a window or a seat element.
• the electric machine 8 can serve as an electric motor for steering power assistance.
• the electric machine 8 according to the invention is also suitable for other applications.
• the lamella 5 of the disk set 6 of the rotor 7 has a centering shoulder 1, which enables a concentric reception of a shaft which can be introduced into a central recess 9 of the lamella 5. Furthermore, the blade 5 has a resilient projection 3, which is designed nose-shaped. The resilient attachment 3 makes it possible to fasten individual disks 5 or disk packs 6 by means of the disk 5 on a shaft 10 (FIG. 2).
• the lamella 5 has further centering shoulders, which are not marked separately for the sake of simplicity. Furthermore, the lamella 5 further resilient lugs, which are also not marked. In the embodiment shown in FIG. 1, the blade 5 has both centering 1 as well as resilient lugs 3.
• a disk pack 6 comprises a plurality of disks 5, as shown in FIG.
• one of the lamellae 5 has at least one centering shoulder, while another of the lamellae 5 has at least one resilient lug 3 having.
• the lamella 5 has recesses 2, 4 in the region of the central recess 9.
• the recesses 2, 4 serve, on the one hand, to create a nose-shaped configuration of the resilient attachment 3.
• the recesses 2, 4 are arranged so that when a packet of the plate pack 6 with a plurality of slats 5, a void behind a resilient projection 3 and / or a centering 1 is created by successive slats 5 are each twisted stacked.
• the centering 1 can be configured so that with respect to the shaft 10 results in a play, transition or interference fit. In this case, a certain positive overlap to the shaft 10 may be provided out, wherein an at least partially elastic configuration of the centering shoulder 1 is advantageous.
• the centering 1 are designed to wave 10 out as a clearance fit.
• the resilient lugs 3 can be designed so that when joining the slats 5 and / or the disk packs 6 on the shaft 10 locally comes to a high surface pressure and in addition to the non-positive connection locally even a positive connection occurs. As a result, the shaft 10 can be made stepless at least in the region of the disk pack 6.
• the centering 1 results in the advantage that a coaxiality of the slats 5 and / or the disk packs. 6 towards the shaft 10 can be achieved with close tolerances. In this case, a cost-effective production of the electrical machine is possible because the disk pack 6 does not have to be reworked. Furthermore, a tolerance for the diameter of the shaft 10 can be widened, since a compensation by the resilient lugs 3 and optionally by resilient centering 1 is created. Furthermore, relatively long disk packs 6 can be mounted on the shaft 10 by a larger number of the slats 5 of a disk pack 6 with resilient lugs 3 and / or Zentrierab arrangementsn 1 is configured.
• the blade 5 also has recesses 11, of which in Fig. 1, only the recess 11 is marked.
• the recesses 11 serve to reduce the mass of the rotor 7 and for mounting.
• the lamella 5 slit-shaped recesses 12, of which in Fig. 1, the recess 12 is marked.
• the slot-shaped recesses 12 of the packetized lamellae 5 are arranged one behind the other so as to enable the reception of permanent magnets.
• FIG. 2 shows a lamella 5 of a lamella packet 6 of a stator 15 together with a housing part 16 of an electric machine 8 according to a second embodiment of the invention.
• the embodiment shown in FIG. 2 can be combined with a rotor 7, which is designed according to the embodiment illustrated with reference to FIG. 1.
• the blade 5 has centering 1, 1 ', between which one, two or more resilient lugs 3, 3' are arranged. In this case, recesses 2, 4 are provided to the resilient lugs 3, 3 'and the centering 1, 1' train.
• the centering 1, 1 ' allow centering of the stator 15 with respect to the shaft 10 to determine the position of the stator 15 with respect to the rotor 7.
• the stator 15 has a disk set 6 formed from a plurality of fins 5, windings and possibly further components.
• the blade 5 is shown in Fig. 2 without these other components.
• the connection of the disk set 6 with the housing part 16 via the resilient lugs 3, 3 ', wherein the centering 1, 1' ensure the positioning and centering.
• the centering shoulders 1, 1 ' in particular compensate for different deformations of the resilient lugs 3, 3' over the circumference of the lamella 5, which could otherwise occur due to manufacturing tolerances and the like.
• the centering shoulders 1, 1 ' therefore, there is also a substantially uniform deformation of the resilient lugs 3, 3', whereby the clamping force of the stator 15 in the housing part 16 is improved.
• This embodiment has the advantage that the coaxiality of the disk set 6 to the shaft 10 and the housing part 16 can be maintained with high accuracy and / or relatively low cost. Furthermore, due to the uniform deformation of the resilient lugs 3, 3 ', which is ensured by the Zentrierab arrangements 1, 1', ensures that all resilient lugs 3, 3 'deform and contribute to the terminals, so that a large clamping force is achieved , Furthermore, the assembly is facilitated, in particular, since further fastening means for fastening or positioning can be omitted.
• the housing part 16 may at least substantially form the housing of the electric machine 8 or form part of the housing of the electric machine 8. It is also possible that the housing part 16 itself is composed of several sections.
• Fig. 3 shows the marked in Fig. 2 with I section of a section along the section line designated by II through the disk set 6 from the designated III viewing direction according to a third embodiment of the invention.
• the disk pack 6 this
• Embodiment has a central part 17 which is formed of a plurality of fins 5.
• slats 5 There are two types of slats 5 are provided, namely slats 5A and slats 5B, which are alternately packaged successively.
• end plates 5C and 5D are provided, wherein at each end of the disk pack 6, one or more end plates 5C and 5D can be provided.
• the lamella 5A is configured such that in an axial direction 18 both behind the centering section 1 of the lamella 5B and behind the resilient lug 3, a clearance 19 is provided which upon compression of the lamellae packet 6 on the shaft 10 a compression of the resilient approach 3 and optionally the Zentrierabsatzes 1 allows.
• one of the lamellae 5B is designed such that a free space 20 is provided in the axial direction 18 behind the resilient projection 3 '.
• an end face 21 of the disk pack 6 can serve as a stop for another component, for example a spring or a further disk set, which can be configured in accordance with the disk set 6, the end face 21 is formed by the end disk 5D which does not have any resilient projections 3, 3 'and no centering 1, 1' has.
• an end face 22 is formed by an end plate 5C.
• no or two or more end disks 5C, 5D can be provided at the respective end of the disk pack 6, no or two or more end disks 5C, 5D can be provided. Furthermore, it is also possible for lamellae corresponding to the end lamellae 5C, 5D to be provided within the lamella packet 6 in order to create the free space 2 and / or the free space 4 and / or the free space 19 and / or the free space 20. In the illustrated embodiment, a free space 19, 20 is provided behind a resilient projection 3, 3 '.
• two or more resilient lugs 3, 3 'in the axial direction 18 can be behind the other, so that on two or more consecutive resilient lugs 3, 3 'each have a free space 19, 20 follows.
• the slats 5 can be provided for the production of the resilient lugs 3, 3 'in the punch slide or single punch, which are automatically adjusted in such a way that slats 5 with and without resilient lugs 3, 3' in the required order produced are as needed when packaging the plate pack 6.
• the structure of the disk pack 6 illustrated in FIG. 3 is correspondingly also in the case of that in FIG. 1 Lamella package 6 of the rotor 7 shown possible.
• the shaft 10 can have no or a reduced number of stages.
• an inner surface 25 of the housing part 16 can be made stepless at least in a region of the disk pack 6.
• the resilient lugs 3 can enter in the area of the inner surface 25 of the housing part 16 in addition to a non-positive and a positive connection.
• FIG. 4 shows a lamella 5 of a disk pack 6 of an electric machine 8 according to a fourth exemplary embodiment of the invention.
• the design of the resilient lugs 3, 3 ' is further described with reference to Figures 5 and 6 in detail.
• an advantageous arrangement with respect to a shaft 10 is provided for the resilient lugs 3, 3 '. This arrangement is further explained in detail for the resilient projection 3 '.
• a reference direction 30 is given.
• the reference direction 30 is defined in this case by a center 31 of the lamella 5 and a recess 11 of the lamella 5.
• the reference direction 30 can also be defined in another way.
• the reference direction 30 is also defined for other slats.
• an angular position 32 of the resilient projection 3 ' is given.
• the tangential position at least substantially successively arranged resilient lugs 3 ' can be varied.
• the angular position 32 of substantially consecutively arranged resilient lugs of several slats vary by a few degrees angle. This has the advantage that when joining the shaft 10 different tracks on a surface 33 (FIG. 6) of the shaft 10 result. As a result, the risk of chip formation when joining the slat 5 or the disk pack 6 is reduced to the shaft 10.
• FIG. 5 shows the detail of a lamella 5 of a lamination stack 6 of a rotor 7 of the fourth exemplary embodiment of the invention, designated V in FIG. 4, the design of the resilient lug 3 being shown in further detail.
• the other resilient lugs of the blade 5 and the other blades of the disk pack 6 may be configured in a corresponding manner.
• a radial direction 34 is given which points to the midpoint 31 of the lamella 5.
• the radial direction 34 lies at least essentially on a symmetry axis 35 of the resilient projection 3 which is locally provided for the resilient projection 3.
• the resilient projection 3 is configured at least approximately symmetrically with respect to the axis of symmetry 35.
• the points 37, 38 are selected as an example in FIG. 5, the point 38 in the inwardly directed, radial direction 34 following the point 37 on the flank 36.
• the points 37, 38 are cross sections 39, 40 defined by the resilient projection 3, wherein the cross-sectional surfaces 39, 40 are each oriented perpendicular to the axis of symmetry 35.
• the resilient projection 3 has a certain tangential width 41.
• the resilient approach 3 of the fin 5 of the fourth embodiment tapers inward in the radial direction 34. At this time, the tangential width 41 decreases from the cross section 39 defined by the point 37 to the cross section 40 defined by the point 38.
• this cross-sectional area is achieved in this embodiment by reducing the tangential width 41, but also a thickness of the resilient lug 3 may decrease.
• the material thickness of the resilient attachment 3 in the radial direction 34 decreases continuously.
• a decreasing stiffness of the resilient lug 3 is achieved in the inward radial direction 34.
• the resilient projection 3 has only one head point 45.
• the head point 45 is the point of the resilient projection 3, which slides along the shaft 33 during joining on the surface 33. It is also possible that the resilient projection 3 is designed slightly flattened in the region of the head point 45.
• Fig. 6 shows a schematic, excerpted section through an assembled on a shaft 10 plate pack 6 of the fourth embodiment of the invention.
• the lamellae 5E, 5F, 5G, 5H, 51, 5J are shown.
• the disk pack 6 may also have a different number of disks 5, 5E to 5J, in particular a significantly larger number of disks.
• the lamella 5 has the resilient projection 3 which is bent over the shaft 10 substantially uniformly curved, wherein the resilient projection 3 has a concavely curved end face 46, which is oriented counter to a joining direction 47. A head point 45 of the resilient projection 3 is in contact with the surface 33 of the shaft 10.
• the lamellae 5E, 5F have resilient lugs 3E, 3F, which are bent according to the resilient projection 3 to the shaft 10 toward substantially uniformly curved.
• the tangential position of the resilient lugs 3, 3E, 3F, which are arranged essentially one behind the other, varies, which is achieved by a variation of the respective angular position 32 of the resilient lug 5, 5E, 5F, as described in detail with reference to FIG is.
• a head point 45F of the resilient lug 3F of the lamella 5F is guided over the surface 33 of the shaft 10 at a different circumferential position.
• a track 48F of the resilient lug 3F is formed, which is different from a track 48 of the resilient lug 5.
• the head of the resilient lug 3E and the corresponding track are in Fig. 6 by the shaft 10 obscured.
• the resilient lugs 3, 3E, 3F when joining the shaft 10 each have their own track, so that the risk of chip formation is minimized.
• the resilient projection 3 in the outwardly directed radial direction 34 ' has an at least partially decreasing material thickness, in particular by the resilient projection 3 in the outwardly directed radial direction 34' has a decreasing tangential width 41.
• FIG. 7 shows a lamella 5 of a lamination stack 6 of a stator 15 of an electric machine 8 according to a fifth exemplary embodiment of the invention.
• Stators in particular of EC internal rotor motors, can be fixed in a radially twisting and axially non-displaceable manner by various methods on a surrounding housing part 16.
• gluing, mechanical pressing with oversize, tightening by Glasankerschrauben, assembly by means of pressed, resilient dowel pins in the gap between the stator 15 and the housing part 16 and thermal shrinking come into question.
• This connection method for the axial and radial fixation of the stator 15 in the housing part 16, which may be formed by an aluminum profile or an aluminum die-cast housing can be replaced by the compound according to the invention.
• aluminum is a possible material.
• Other possible materials include steels and plastics.
• the fastening method of the stator 15 of the electric machine 8 in the housing part 16 can be achieved by means of integrally formed geometries on the stator circumference, which are barbed by mounting on the end product.
• the solution described below for the attachment of the stator 15 in the housing part 16 can be transmitted in a corresponding manner to the attachment of the rotor 7 to the shaft 10.
• a circumferential contour 50 of the fin 5 is formed by punching or the like deviating from a circular shape.
• recesses 51 are provided, of which in Fig. 7, the recess 51 is marked.
• the recesses 51 are set back relative to a radius 52 of the lamella 5.
• the resilient lugs 3, 3 ', 3''extend at least approximately up to the radius 52.
• the resilient lugs 3, 3', 3 '' project slightly beyond the radius 52 of the lamella 5, so that in the case of a housing part 16 with a fully cylindrical contour of the inner surface 25 (FIG. 2) bending of the resilient lugs 3, 3 ', 3 "is achieved during joining. As a result, the production of the housing part 16 is facilitated.
• the resilient lugs 3, 3 ', 3'' can also be performed up to the radius 52 or even below this.
• this requires a counterpart, ie here an inner surface 25 of the housing part 16, with a not fully cylindrical contour.
• This not fully cylindrical contour can be designed so that it is guided at least in the region of the resilient projections 3, 3 ', 3''up to the radius 52 or in this. As a result, a reliable attachment by compression of the resilient lugs 3, 3 ', 3''during joining can also be achieved.
• the peripheral contour 50 does not necessarily have to arise from a circular shape.
• the peripheral contour 50 can start from a polygonal shaped contour, which can be modified according to the configuration shown in FIG. 7, by providing recesses 51 and resilient projections 3, 3 ', 3 ".
• the circumferential contour 50 in the area of the resilient lugs 3, 3 ', 3 ", that is to say in the region of the contact with the inner surface 25 of the housing part 16, is designed in such a way that there is an excess in combination with this inner surface 25 to allow the function of the resilient lugs 3, 3 ', 3' '.
• a slight air gap may be located within the areas between the plate pack 6 of the stator 15 and the inner surface 25 of the housing part 16, in which no contact between a blade and the housing part 16 is desired.
• the blade 5 of the fifth exemplary embodiment of the invention shown in FIG. 7 has at least one projection 53 with a semicircular contour.
• the projection 53 stands clearly beyond the radius 52.
• the projection 53 is significantly further beyond the radius 52 than the resilient lugs 3, 3 ', 3''.
• a positive connection in a circumferential direction 55 may be formed with the housing part 16.
• the projection 53 engages in a recess 54 in the Inner surface 25 of the housing part 16, which is formed by a groove extending in an axial direction.
• a projection 53 is shown.
• multiple projections corresponding to the protrusion 53 may often be provided on the peripheral contour 50.
• the angular distance between such projections can be selected with respect to the particular application.
• FIG. 8 shows a lamella 5 of a lamination stack 6 of a stator 15 with a housing part 16 of an electrical machine 8 in accordance with a sixth embodiment of the invention.
• the blade 5 has a plurality of resilient lugs 3, 3 ', 3'', of which in Fig. 8 to simplify the illustration, only the resilient lugs 3, 3', 3 '' are marked.
• the housing part 16 on the inner surface 25 a plurality of recesses 54, 54 ', 54'', of which in Fig. 8, only the recesses 54, 54', 54 '' are marked.
• both the resilient lugs 3, 3 ', 3''and the recesses 54, 54', 54 '' in the circumferential direction 55 are arranged regularly repeating the lamella 5 or the housing part 16, so that a positioning when joining the stator 15 in the housing part 16 is simplified.
• a certain position of the stator 15 with respect to the housing part 16 can also be predetermined in the circumferential direction 55.
• the resilient projection 3 engages when joining in the recess 54, wherein the resilient projection 3 protrudes well beyond the radius 52 and is bent during joining within the recess 54.
• the recesses 54, 54 ', 54'' can be configured groove-shaped, wherein the respective groove extends in an axial direction.
• the stator 15 can be inserted by means of a press in the housing part 16.
• the described, respective interference between in the resilient projection 3, 3 ', 3''and the associated recess 54, 54', 54 '' in the inner surface 25 of the housing part 16 forces the resilient lugs 3, 3 ', 3''thereto to deform defined in the contact area.
• It can be a plastic part and a permanently residual elastic residual amount exist. The bending can be facilitated by a chamfer in the insertion area.
• the stator 15 is permanently secured in the housing part 16.
• connection between the stator 15 and the housing part 16 described with reference to FIGS. 7 and 8 can be applied correspondingly to the connection between a rotor 7 and a shaft 10 of the electric machine 8.

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• 2008
  • 2008-01-17 DE DE102008004876A patent/DE102008004876A1/de active Pending
  • 2008-01-24 EP EP08701658A patent/EP2115853A1/de not_active Withdrawn
  • 2008-01-24 BR BRPI0807339-2A2A patent/BRPI0807339A2/pt not_active IP Right Cessation
  • 2008-01-24 RU RU2009132611/07A patent/RU2454773C2/ru not_active IP Right Cessation
  • 2008-01-24 KR KR1020097016140A patent/KR101436796B1/ko not_active IP Right Cessation
  • 2008-01-24 CN CN2008800037757A patent/CN101627521B/zh not_active Expired - Fee Related
  • 2008-01-24 US US12/525,413 patent/US8823239B2/en not_active Expired - Fee Related
  • 2008-01-24 WO PCT/EP2008/050783 patent/WO2008092789A1/de active Application Filing
  • 2008-01-24 JP JP2009547644A patent/JP4951072B2/ja not_active Expired - Fee Related

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