WO2014056791A1 - Moyen de serrage pour la fixation mécanique d'aimants dans un rotor en étoile - Google Patents

Moyen de serrage pour la fixation mécanique d'aimants dans un rotor en étoile Download PDF

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Publication number
WO2014056791A1
WO2014056791A1 PCT/EP2013/070675 EP2013070675W WO2014056791A1 WO 2014056791 A1 WO2014056791 A1 WO 2014056791A1 EP 2013070675 W EP2013070675 W EP 2013070675W WO 2014056791 A1 WO2014056791 A1 WO 2014056791A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
clamping means
permanent magnet
recess
stator according
Prior art date
Application number
PCT/EP2013/070675
Other languages
German (de)
English (en)
Inventor
Norbert Kupke
Bjoern Nommensen
Stefan Stoermer
Mirco Beier
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to CN201380052517.9A priority Critical patent/CN104685765B/zh
Publication of WO2014056791A1 publication Critical patent/WO2014056791A1/fr

Links

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
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor 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
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
    • H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets

Definitions

  • the present invention relates to a rotor, in particular a
  • a spoke rotor for an electric machine, comprising a body concentrically disposed about a rotor axis extending in an axial direction, a permanent magnet disposed in a recess of the body, and a clamping means supporting the permanent magnet in the body Recess fixed.
  • the present invention further relates to a motor with a rotor according to the invention and a hand tool with such a motor.
  • a permanent magnet in a recess of a rotor or stator, in particular a synchronous machine this is conventionally pressed into the recess and clamped by means of at least one clamping lug.
  • the clamping lug is provided on the side facing the axis of rotation of the permanent magnet on the main body of the rotor and fixes the
  • Permanent magnet not only radial, but also holds it axially. In this technique, the permanent magnet is exposed to high mechanical stresses and its surface and / or coating is common, especially in the
  • both the rotor core and the permanent magnets expand differently than the temperature range prevailing in the rotor or stator, which is often in the range of -40 ° - + 160 ° C. Since the clamping nose is formed integrally with the rotor block or with lamellae of the rotor block, allows them due to the different temperature behavior and different component tolerances of the permanent magnet relative to the slats or the rotor block is not sufficient compensation
  • German patent application DE 10 2010 039 334 discloses a rotor or stator for an electrical machine in which separate elastic fixing means are arranged in the recesses into which the permanent magnets are joined. Due to their elasticity, the fixing means have a defined spring behavior and / or mechanical clamping behavior, so that they can be dimensioned such that both the component tolerances of the permanent magnet and its temperature behavior can be compensated with it via the bandwidth of the temperatures prevailing in the rotor or stator.
  • the fixing means are arranged on Axialfix istsmitteln, which are each arranged transversely to the rotor axis at the ends of the permanent magnet. Since the fixing means are arranged on the Axialfix réellesstoffn, they are common in one step in the recesses and held securely in the rotor at a magnetic break or missing permanent magnet.
  • the object of the present invention is to provide a rotor or stator with one provided in the recess of the rotor or stator
  • Clamping means with which the component tolerances of the permanent magnet and its temperature behavior are very well compensated, wherein the clamping means is very easy to install and very inexpensive to produce. Another object of the present invention is that the clamping means in a
  • Magnetic break is securely fixed in the recess of the rotor.
  • a machine comprising a body concentrically disposed about a rotor axis extending in an axial direction
  • Permanent magnet which is arranged in a recess of the base body, and with a clamping means which fixes the permanent magnet in the recess, wherein the base body has adjacent sectors, between which the
  • Permanent magnet is arranged, and wherein the clamping means has a stop, with which it bears against a magnetic break or missing permanent magnet on one of the adjacent sectors of the body.
  • the stop causes the clamping means is securely fixed in the recess in the absence of permanent magnet or magnetic break, so that it can not fall out of the recess or out of the rotor. In this case, no additional fixing means are required to prevent falling out of the clamping means in case of magnetic failure or missing permanent magnet.
  • clamping means are used, which are completely incorporated in the recess in the recess.
  • the clamping means according to the invention has the advantage that it is independent of the structural conditions at the two rotor ends of the rotor compared to a fixing means arranged on the Axialfix réellesstoff.
  • the following explanations refer to a rotor.
  • the invention is not limited to a rotor, but also applicable to a stator.
  • the rotor according to the invention preferably has a plurality of permanent magnets, which are distributed uniformly in the tangential direction in the rotor, wherein at least one clamping means is provided for each permanent magnet.
  • the clamping means are preferably inserted after the insertion of the permanent magnets in their recess.
  • Permanent magnet while mechanically almost not or not at all claimed. As a result, it is not damaged when inserted into its recess. Since the permanent magnet is inserted in the recess before mounting the clamping means, it is only by arranging the clamping means in the recess
  • clamping means for different length rotors can be used, with very long rotors optionally not only a clamping means, but in the axial direction one behind the other two or more clamping means in the
  • the clamping means preferably extends into the recess in the axial direction. Preferably, it has a contact region with which it on
  • the contact region is preferably provided transversely to the radial direction of the rotor. It is preferably flat or particularly preferably linear. Not to the permanent magnet
  • the clamping means is rounded at least in the contact region on the side facing the permanent magnet side and / or bent into the recess.
  • the surface pressure and / or clamping force of the clamping means in the contact area is constant.
  • the clamping means is elastic.
  • it is deformable against a restoring force and thus has a defined spring behavior and / or mechanical clamping behavior. This makes it so dimensioned that both the component tolerances of the permanent magnet as well
  • the clamping means is elastic and plastic, so that it still has a sufficient elasticity after a plastic deformation, in particular during clamping of the permanent magnet to the Compensate component tolerances and / or the temperature behavior of the permanent magnet.
  • the clamping means is as a spring
  • Band material manufactured. Also preferably, it is made of a rubber, or of a plastic, for example of an elastomer.
  • Clamping means is therefore inexpensive to produce from conventional material by conventional methods.
  • the clamping means fix the permanent magnet in the radial direction, that is, in a direction radiating from the axis of rotation, in the recess.
  • the permanent magnet is arranged on its side facing away from the clamping means substantially free of play in the recess.
  • the clamping means also acts in the axial direction.
  • the elasticity of the clamping means is designed so that the permanent magnet is clamped in the recess. Preferably, it is therefore no longer axially displaceable.
  • the base body of the rotor comprises a shaft region, which has a counter support surface delimiting the recess. It is preferred that the clamping means has a support surface, with which it is supported on the counter support surface.
  • At least some of the sectors are connected via longitudinal webs to the waveband. Unless all sectors are connected to the shaft region via longitudinal webs, it is preferable to connect at least some of the adjacent sectors via transverse webs in order to ensure sufficient stability and shaping of the rotor.
  • the transverse webs are preferably at the Rotor axis facing away from the base body provided and also preferably integrally formed therewith.
  • the clamping means is arcuate or wavy.
  • the clamping means has two open ends, which are preferably bent into the recess, so that the insertion of the clamping means in the recess is easy.
  • Supporting surface of the shaft region is spaced. Between the
  • the clamping means preferably has a rising or falling edge.
  • the clamping means is formed symmetrically to a symmetry axis which extends in and / or transverse to an extension direction of the clamping means. This has the advantage that the clamping means can be handled independently of direction and therefore very easy due to its symmetry during assembly.
  • the clamping means have a wavelength, an amplitude height and / or a material thickness.
  • the wavelength, amplitude height and / or the material thickness of the clamping means define its shape and
  • a clamping means of small material thickness for example, in comparison to a clamping means of greater material thickness with the same wavelength and amplitude by entry of a lower energy deformable.
  • the spring stiffness of the clamping means lesser material thickness is therefore smaller compared to the spring stiffness of the clamping means of greater material thickness at the same amplitude and wavelength.
  • This clamping means is interpretable so that the occurring in the rotor
  • the stop is provided either before and / or after the contact area, or it is provided in the contact area. It is preferred that the stop is spaced from the counter-support surface of the shaft region. Particularly preferred is the stop by broadening the
  • the clamping means is preferably located on its side facing away from the rotor axis at the adjacent sectors.
  • the sectors preferably comprise a first area formed as a pocket for receiving at least one permanent magnet, and a second area for receiving the clamping means for the permanent magnet.
  • the sectors On their side facing the rotor axis, the sectors preferably each have two collection regions, to serve for collecting the magnetic useful flow. In each case, a collection area of a sector is opposite to one
  • Collection area of the adjacent sector arranged so that the pocket for the permanent magnet between these collection areas is arranged. It is preferred that the clamping means in case of magnetic failure or missing
  • Permanent magnet is applied to these two collecting areas of the adjacent sectors, so that it is jammed between these and the mating support surface.
  • the rotor is preferably designed as a spoke rotor, so that the
  • Permanent magnets each extending parallel to a fictitious plane which is spanned by a extending in the axial direction of the rotor and by a extending in the radial direction of the rotor line. It is preferably designed as a flat magnet.
  • the invention is not limited to spoke rotors, but also applicable to rotors with a different arrangement of the permanent magnets.
  • the rotor is made as a disk set of a plurality of fins.
  • the invention is also applicable to rotors which are formed from a solid body.
  • An electric machine is, for example, an electric motor, a starter, a generator or an auxiliary drive, in particular for motor vehicles.
  • the electric machine is an electric motor, in particular a synchronous machine.
  • the object is further achieved with a hand tool with such an electric motor.
  • a hand tool machine is for example a drill, a jig saw or the like.
  • the object is further achieved with a Versteilantrieb with such an electric motor.
  • Such Versteilantrieb is for example a servo drive or a tailgate or Novaverstellantrieb for a motor vehicle.
  • Fig. 1 shows an embodiment of a clamping means for a
  • Fig. 2 shows a section of a rotor according to the invention with the clamping means of Fig. 1, wherein in (a) and (b) no
  • Permanent magnets are arranged in the rotor, and wherein in (c) and (d) permanent magnets are arranged in the rotor, and wherein (b) shows an enlarged section of (a), and wherein (d) - (f) each have an enlarged section of (c) show
  • FIG. 3 shows a further embodiment of a clamping means for a rotor according to the invention, in (a) in a perspective view, and in (b) in a side view, Fig. 4 shows a section of a rotor according to the invention with the clamping means of Fig. 3, wherein in (a) and (b) no
  • Permanent magnets are arranged in the rotor, and wherein in (c) and (d) permanent magnets are arranged in the rotor, and wherein (b) shows an enlarged section of (a), and wherein (d) shows an enlarged section of (c), and
  • Fig. 5 shows a section through a rotor according to the invention.
  • Fig. 1 shows in (a) - (c) a first embodiment of a clamping means 5 for a rotor 1 according to the invention in a perspective view.
  • the illustrated clamping means 5 is made as a stamped and bent part of a sheet of spring steel.
  • the clamping means 5 extends in an extension direction 20 and is here arcuate. In cross-section (see Fig. 1 (b)), it therefore has in
  • the clamping means here therefore has a half wavelength 54, an amplitude height 53 and a material thickness 55, which determine its shape and properties.
  • it is elastic and has a spring stiffness and a restoring force, so that it acts as a spring.
  • the clamping means 5 can be dimensioned such that it fixes a permanent magnet 4 (see Fig. 2 (c)) in the radial direction 22 of a rotor 1, and preferably also in the axial direction 21 of the rotor 1 it jammed it in a recess 6 (see Fig. 2 (c)) of the rotor 1.
  • the clamping means 5 has a base width 561 which is designed so that it can be easily inserted into the recess 6.
  • the clamping means 5 in the region 5220 of the vertex 522 on both sides of widenings 512, the stops 51 form.
  • Vertex 522 is therefore increased by the width 562 of both widenings 512.
  • FIG. 2 shows in (a) and (b) the recess 6 of the rotor 1
  • the rotor 1 extends concentrically around a rotor axis 2.
  • the direction of extension 20 of the clamping means 5 is here shown to be equal to an axial direction 21 of the rotor 1 in an ideal manner.
  • the illustrated rotor 1 is a spoke rotor in which as permanent magnets 4 flat magnets are arranged so that they spokes, that is, parallel to a notional plane (not shown) extending through an axial direction 21 of the rotor 1 and in the radial direction 22 of the rotor 1 extending line (not shown) is spanned.
  • a notional plane not shown
  • Speichenrotor the permanent magnets 4 are magnetized in the tangential direction 23, so that in the tangential direction 23 of the rotor 1 always a magnetic north pole N with a magnetic south pole S alternates.
  • spoke rotor and rotor 1 are used synonymously.
  • the rotor 1 has a main body 3, which is formed as a disk set of a plurality of fins (not shown). It has sectors 30, wherein here between all adjacent sectors 30, a transverse web 33 is provided, with which the sectors 30 are interconnected. However, the invention also includes rotors 1, in which not all adjacent sectors 30 of a lamella are connected to one another via a transverse web 33.
  • the main body 3 also has a shaft region 31 which extends concentrically around the rotor axis 2 and is provided for receiving a shaft (not shown).
  • the sectors 30 are in each case connected via longitudinal webs 32 to the shaft region 31. Between the sectors 30 is the respective
  • Recess 6 for receiving each of a permanent magnet 4 is provided.
  • Each recess 6 has a first portion 60 for receiving the
  • Permanent magnet 4 which is pocket-shaped and which is provided here on the side 36 facing away from the axis of the base body 3, and a second region 61 in which the clamping means 5 can be arranged and which is provided on the axially facing side 37 of the base body 3.
  • the clamping means 5 are inserted for fixing the permanent magnets 4 in the axial direction 21 in the second region 61 of the recess 6, so that their extension direction 20 extends as parallel as possible to the axial direction 21.
  • They At their open ends 51, which are provided bent in order to avoid scratches in the recess 6, they then have a support surface 57 (see Fig. 1 (b)), with which the clamping means 5 on a mating support surface 35, the Recess 6 bounded on its axis facing side 622, supported.
  • Support surface 35 formed just. In principle, however, is also a curved formation of these surfaces 57, 35, for example concentrically around the
  • Clamping means this is spaced in the region 5220 of the vertex 522 by the amplitude height 53 of the counter support surface 35.
  • the sectors 30 have collecting regions 34 which are provided for collecting the magnetic flux.
  • the collecting areas 34 are approximately pie-shaped and have an edge 59 which extends in the axial direction 21.
  • the clamping means 5 is designed so that it stops at not arranged in the recess 6 permanent magnet 4 or magnetic break with its stops 51 to the edges 59 of the collecting regions 34 of the adjacent sectors 30, between which the permanent magnet 4 can be arranged.
  • FIGS. 2 (c) and (d) show the rotor 1 in the recesses 6
  • the permanent magnets 4 of this embodiment of the rotor 1 project over the edges 59 of the collecting regions 34 of the adjacent sectors 30 so as to protrude into the second area 61 of the recess 6 in which its clamping means 5 is located.
  • the contour of the clamping means 5 is chosen here so that the
  • the stops 51 formed by the widenings 512 protrude in the tangential direction 23 on both sides beyond the permanent magnet 4. If the permanent magnet material is partially distributed in the recess 6 in the case of magnetic fracture, the restoring force of the clamping means 5 is dimensioned such that it is pressed against the edges 59 of the collecting regions 34, which are arranged in the tangential direction 23 on both sides of the permanent magnets 4. The clamping means 5 is therefore jammed not only in the absence of permanent magnet 4, but also at
  • FIGS. 2 (e) and (f) each show a section of the rotor 1 of FIGS. 2 (c) and (d).
  • the clamping means 5 is rotated in the recess 6, so that its extension direction 20 extends at an angle 24 to the axial direction 21.
  • the clamping means 5 or an extending in the extension direction center line 65 of the clamping means 5 is offset laterally by an offset 64 to a running in the axial direction 21 center line 63 of the recess 6. Nevertheless, the permanent magnet 4 is held securely by the clamping means 5 and also the jamming of the clamping means 5 in case of magnetic breakage is ensured.
  • a length 54 (see Fig. 1 (b)) of the clamping means 5 is selected so that one or both open ends 52 of the clamping means 5 at an angular arrangement of the extension direction 20 to the axial direction 21 in a stop region 532 at one or at both the recess 6 limiting longitudinal webs 32 abut, as shown in FIG. 2 (e) shows.
  • the width 562 of the two stops 51 is selected so that one of the two stops 51 abuts in a stop area 532 on the longitudinal web 32, and the other stop 51 is nevertheless selected wide enough that the clamping means 5 against the edge 59 of the Collection area 34 would be pressed, as shown in FIG. 2 (f) shows.
  • FIG 3 shows a further embodiment of a clamping means 5 for a rotor 1 according to the invention.
  • the stops in this exemplary embodiment are not located in the region 5220 of the vertex 522 or in the contact region 58, but in each case before and after, ie in the region of the rising and falling flanks 521, 523.
  • This clamping means 5 is therefore suitable, as shown in FIG. 4, for a rotor 1 with permanent magnets 4, which are arranged completely in the first pocket-shaped region 60 of the recess 6 and do not protrude into the second region 61.
  • the clamping means 5 projects in the contact region 58 into the first region 60 of the recess 6. This has the advantage that a rotation of the clamping means 5, which at an angle 24 between the
  • Extension direction 20 of the clamping means 5 and the axial direction 21 of the rotor 1 leads, hardly possible. And also a lateral offset 64 between the running in the axial direction 21 center line 63 of the recess 6 and extending in the direction of extension 20 center line 65 of the clamping means 5 is hardly possible.
  • 5 shows an example of a section through the rotor 1 of
  • the permanent magnets 4 are here in each case by two clamping means 5, which are arranged one behind the other in the axial direction 21, fixed in the recess 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

L'invention concerne un rotor, en particulier un rotor en étoile, destiné à une machine électrique, doté de : un corps de base qui est disposé concentriquement autour un axe de rotor qui s'étend dans une direction axiale; un aimant permanent qui est disposé dans un évidement du corps de base; et un moyen de serrage qui fixe l'aimant permanent dans l'évidement. Le corps de base comprend des secteurs voisins entre lesquels est disposé l'aimant permanent tandis que le moyen de serrage comprend une butée qui, en cas de rupture d'aimant ou d'absence d'aimant permanent, est appuyée sur un des secteurs voisins du corps de base. La présente invention concerne en outre un moteur électrique équipé d'un rotor conforme à la présente invention ainsi qu'une machine-outil portative équipée d'un tel moteur électrique.
PCT/EP2013/070675 2012-10-09 2013-10-04 Moyen de serrage pour la fixation mécanique d'aimants dans un rotor en étoile WO2014056791A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201380052517.9A CN104685765B (zh) 2012-10-09 2013-10-04 用于将磁铁机械地固定在轮辐转子中的夹持机构

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012218343.4 2012-10-09
DE102012218343.4A DE102012218343A1 (de) 2012-10-09 2012-10-09 Klemmmittel zur mechanischen Fixierung von Magneten in einem Speichenrotor

Publications (1)

Publication Number Publication Date
WO2014056791A1 true WO2014056791A1 (fr) 2014-04-17

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ID=49304956

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2013/070675 WO2014056791A1 (fr) 2012-10-09 2013-10-04 Moyen de serrage pour la fixation mécanique d'aimants dans un rotor en étoile

Country Status (3)

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CN (1) CN104685765B (fr)
DE (1) DE102012218343A1 (fr)
WO (1) WO2014056791A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014217432A1 (de) * 2014-09-01 2016-03-03 Volkswagen Aktiengesellschaft Verfahren und Einrichtung zur Befestigung eines Magneten in einer Aufnahmetasche, elektrische Maschine oder Primärteil derselben
FR3036006B1 (fr) * 2015-05-07 2019-08-02 Valeo Equipements Electriques Moteur Rotor de machine electrique tournante muni d'au moins un element de plaquage d'un aimant a l'interieur d'une cavite correspondante
DE102017218408A1 (de) * 2017-10-13 2019-04-18 Volkswagen Aktiengesellschaft Elektrische Maschine mit einem Lamellenpaket zur Fixierung eines Magneten sowie ein Lamellenpaket zur Verwendung bei einer solchen Maschine
FR3074978B1 (fr) * 2017-12-11 2020-06-12 Valeo Equipements Electriques Moteur Machine electrique tournante munie de butees de maintien pour des ressorts d'aimants permanents
US11418074B2 (en) 2018-07-13 2022-08-16 Abb Schweiz Ag Rotary electrical machine with spoked rotor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1309066A2 (fr) * 2001-10-31 2003-05-07 Siemens Aktiengesellschaft Rotor à aimant permanent pour une machine synchrone
DE102009045101A1 (de) * 2009-09-29 2011-04-14 Robert Bosch Gmbh Elektrische Maschine mit minimiertem Rastmoment
DE102010039334A1 (de) 2010-08-16 2012-02-16 Robert Bosch Gmbh Befestigung von Magneten an einem Rotor
WO2012022731A2 (fr) * 2010-08-16 2012-02-23 Robert Bosch Gmbh Élément élastique pour fixer mécaniquement des aimants dans un rotor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007015249A1 (de) * 2007-03-27 2008-10-02 Miele & Cie. Kg Rotor, insbesondere für einen Elektromotor einer Umwälzpumpe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1309066A2 (fr) * 2001-10-31 2003-05-07 Siemens Aktiengesellschaft Rotor à aimant permanent pour une machine synchrone
DE102009045101A1 (de) * 2009-09-29 2011-04-14 Robert Bosch Gmbh Elektrische Maschine mit minimiertem Rastmoment
DE102010039334A1 (de) 2010-08-16 2012-02-16 Robert Bosch Gmbh Befestigung von Magneten an einem Rotor
WO2012022731A2 (fr) * 2010-08-16 2012-02-23 Robert Bosch Gmbh Élément élastique pour fixer mécaniquement des aimants dans un rotor

Also Published As

Publication number Publication date
CN104685765A (zh) 2015-06-03
DE102012218343A1 (de) 2014-04-10
CN104685765B (zh) 2017-12-29

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