EP2499718A1 - Rotor de machine électrique - Google Patents

Rotor de machine électrique

Info

Publication number
EP2499718A1
EP2499718A1 EP10771660A EP10771660A EP2499718A1 EP 2499718 A1 EP2499718 A1 EP 2499718A1 EP 10771660 A EP10771660 A EP 10771660A EP 10771660 A EP10771660 A EP 10771660A EP 2499718 A1 EP2499718 A1 EP 2499718A1
Authority
EP
European Patent Office
Prior art keywords
rotor
opening
segment
single segment
individual
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP10771660A
Other languages
German (de)
English (en)
Inventor
Werner König
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mercedes Benz Group AG
Original Assignee
Daimler AG
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 Daimler AG filed Critical Daimler AG
Publication of EP2499718A1 publication Critical patent/EP2499718A1/fr
Withdrawn legal-status Critical Current

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
    • H02K1/27—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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets

Definitions

  • the invention relates to a rotor of an electric machine according to the preamble of claim 1.
  • Rotors for electrical machines are known in many ways and can be specially shaped depending on the task of the electrical machine.
  • a rotor of an electrical machine which is manufactured from a sheet-metal strip.
  • a chain of sub-segments of the rotor is punched from a metal strip, these sub-segments are firmly connected to one another at one point.
  • the chain is then bent into a rotor, which gains by overlaying several layers of metal at axial depth. Since the sub-segments are already firmly connected to each other via the connection point, no additional attachment of the sub-segments is required for this rotor.
  • the subsegments are already attached via the material bridge of the connection point.
  • a rotor of an electrical machine which is constructed from individual segments. This is proposed in the document especially for electric motors with a larger inner diameter to facilitate their installation and handling.
  • the segments are described in the case of a synchronous motor as a carrier plates with external permanent magnets. These segments are then mounted on the rotor so that in case of repair, the individual segments can be removed and replaced. In production, each segment must therefore be mounted on the rotor, which increases the assembly effort and the work steps.
  • the object of the invention is to simplify the manufacture of a rotor.
  • a rotor formed of individual segments has a first part of the single segment and a second corresponding part of the adjacent one
  • the rotor is characterized in that the first part of the single segment and the second corresponding part of the adjacent individual segment are designed such that the two adjacent ones
  • the shape should be designed such that the largest possible contact surface between the two adjacent individual segments forms in the assembled rotor, since a small change in the magnetic flux in the rotor is influenced by this contact surface.
  • the contact surface of the two adjacent individual segments makes up over 90% of the theoretically possible contact area of the first part of the individual segment and of the second corresponding part of the adjacent individual segment.
  • Single segment formed such that only a portion of the first part of the single segment and a corresponding portion of the second corresponding part of the adjacent single segment cause the positive connection between the first part and the second part in the radial direction and in the circumferential direction.
  • the shape of the first part of the single segment and the second corresponding part of the adjacent single segment is advantageously formed as a dovetail joint.
  • This form fulfills the conditions of positive locking in the radial direction and in the circumferential direction.
  • the production of the mold can be realized with simple means and also simple dimensions according to the material properties of the individual segments.
  • the shape of the first part of the single segment and the second corresponding part of the adjacent single segment is formed as a Christmas tree connection.
  • each individual overlap region Due to the distribution of the positive connection in the radial direction and in the circumferential direction over a plurality of overlap regions, each individual overlap region can be dimensioned smaller. This can be reduced in the production of the waste.
  • all the individual segments have the same shape.
  • each individual segment is constructed from a laminated core.
  • the shapes of the first part of the single segment and the second corresponding part of the adjacent single segment can be produced particularly easily by punching the complete shape of the single segment from a sheet metal strip.
  • punching the complete shape of the single segment from a sheet metal strip In order to get from the shape of the single segment with the depth of a metal strip the required axial depth of the single segment for the rotor, several punched out forms are built into a laminated core.
  • the material of the metal strip provides a favorable magnetic property.
  • each individual segment an opening in the axial direction contained, which serves to receive a permanent magnet.
  • the opening in the axial direction forms a pocket which is limited in the radial direction and in the rotor circumferential direction.
  • the shape of the opening is constant over the axial direction, so that the production and further processing of the opening are facilitated. It is also advantageous to choose the shape of the opening in the axial direction corresponding to the permanent magnet to be used, so that it can be easily inserted and fixed in the opening.
  • Permanent magnets attack act in the radial direction and are attached to the
  • each individual segment has a deformable region.
  • the deformable region is arranged between the first part of the individual segment and the opening for receiving a permanent magnet and / or between the second corresponding part of the individual segment and the opening for receiving a permanent magnet.
  • the deformable region is deformed such that the opening for receiving a permanent magnet in the radial and / or circumferential direction is reduced.
  • the permanent magnet is inserted before the joining of the individual segments in the opening of the single segment.
  • the opening in the axial direction and the deformable area are configured such that a permanent magnet can be inserted easily into the opening and the deformable area reduces the opening after joining the individual segments to such an extent that the permanent magnet is pressed into the opening without the contact forces being critical Exceeding force, which causes structural damage in the permanent magnet.
  • the deformable region is arranged in the radial direction within the opening for receiving a permanent magnet.
  • the deformable area is formed so that after pressing the
  • the deformable region is deformed such that the opening for receiving a permanent magnet in the radial direction is reduced.
  • the permanent magnets are inserted before pressing the assembled individual segments on the rotor carrier in the openings of the individual segments.
  • the opening in the axial direction of the individual segment and the deformable region are configured such that a permanent magnet can be inserted easily into the opening and the deformable region reduces the opening so far after pressing onto the rotor carrier that the permanent magnet is pressed into the opening without the Contact forces exceed a critical force, which causes structural damage in the permanent magnet.
  • the axial opening in the single segment is limited by a third movable part in a further advantageous embodiment of the rotor.
  • This movable part is designed such that upon movement of the third part, the radial extent of the opening changes.
  • This change in the radial extent of the opening according to the invention need not be the same everywhere, so that one end of the third movable part is fixedly connected to the single segment and the other end is radially movable about this point.
  • This movable end has a shape which engages with a bulge of the single segment or the adjacent single segment in the closed state, so that the bulge fixes the movable part.
  • the bulge may also be part of the adjacent single segment of the assembled rotor.
  • FIG. 1 shows a composite, segmented rotor of an electric machine
  • FIG. 2 shows a punching arrangement of individual segments on a sheet-metal strip
  • Fig. 3 shows a detail of a rotor which is composed of individual segments, wherein the individual segments a first part of the single segment and show a second corresponding part of the adjacent single segment,
  • FIG. 4 shows a detail of an alternative rotor of individual segments, in which a third, movable part of the individual segment is positioned so that the axial opening for mounting with permanent magnets is radially enlarged,
  • FIG. 5 shows a detail of an alternative rotor made up of individual segments which have a deformable region
  • Fig. 6 shows a detail of an alternative rotor of individual segments, in which in each case a deformable region is arranged in the radial direction within the opening for receiving a permanent magnet.
  • FIG. 1 shows an axial view of a segmented rotor 1 of an electrical machine.
  • the rotor 1 is constructed of individual segments 2, which are arranged to form a ring.
  • the individual segments 2 show an axial opening 3, which for receiving a
  • the axial opening 3 limits the position of the
  • Permanent magnets in the radial direction and in the circumferential direction such that thereby the permanent magnet is positioned in the opening. This has the advantage that the permanent magnets need not be additionally secured against the centrifugal forces of the rotating rotor and only need to be slightly fixed in the axial direction. The force of the magnetic field on the
  • Permanent magnet is transmitted to the outer contour of the axial opening 3 and does not act in the axial direction.
  • the rotor 1 shown here is accordingly suitable for use in a permanently excited synchronous motor.
  • the rotor 1 is constructed from the same individual segments 2. This facilitates the production of the individual segments, since only identical individual segments 2 must be produced and also the assembly of the rotor 1, since the Order of the individual segments 2 within the ring assembly interchangeable and thus is freely selectable.
  • Each individual segment 2 has a first part 4 which is in contact with a second corresponding part 5 of the adjacent individual segment 2.
  • the first part 4 is in this embodiment of the rotor 1, a portion of the side surface of the single segment 2 in the circumferential direction.
  • the second part 5 is a section of
  • Single segments 2 is generated by the first part 4 and the second corresponding part 5 a positive connection in the radial direction and in the circumferential direction.
  • This advantageous embodiment of the first part 4 and the second corresponding part 5 stabilizes the ring of individual segments 2 and generates a self-supporting structure.
  • An advantageous embodiment of the first part 4 and of the second corresponding part 5 is shown at a section of the rotor 1 in Fig. 3 and Fig. 4 and explained in more detail there.
  • Orientation of the single segment 2 with respect to the later position within the rotor 1 is meant to its axis of rotation.
  • the positive connection in the radial direction not only enables the pressing of the rotor 1 on the rotor carrier, but also acts on the centrifugal force of the rotating rotor. 1 opposite.
  • the positive locking in the radial direction and the circumferential direction allows the individual segments to be assembled without further fastening devices to form a stable rotor 1.
  • This segmented rotor 1 is so stable due to the radial form-fitting that it can also be used in high-speed electrical machines.
  • the magnetic flux is also affected during a material transition. This is already the case in the case of a gap between the individual segments 2. Will this
  • Single segment 2 are formed such that they touch substantially over the entire theoretically possible contact surface away, without forming an air gap between the two parts.
  • the magnetic properties of the rotor 1 shown in Figure 1 thus correspond largely to the properties of a non-segmented rotor and have an analog magnetic flux.
  • FIG. 2 shows a possible punching arrangement of a shape of the individual segments 2 on a sheet-metal strip.
  • Sheets offer good magnetic properties for rotors and simple
  • the shapes of the rotors are punched from sheets and then assembled into laminated cores.
  • the entire rotor ring must be punched out of the sheet, creating a lot of sheet metal waste.
  • the arrangement of the shape of the individual segments can be chosen much better, so that the waste can be reduced.
  • punching the individual segments and smaller punching tools are required, which produce the individual segments 2 in very large numbers.
  • punching the outer shape of the single segment 2 equal to the axial opening 3 mitgestanzt for receiving the permanent magnet.
  • metal sheets Due to their method of production, metal sheets usually have a preferred magnetic direction, which is taken into account in a punching arrangement of the individual segments 2, so that a rotor 1 made of individual segments 2 with similar magnetic properties also
  • Figure 3 shows a section of the rotor 1 with individual segments 2 and an opening 3 in the axial direction for insertion of permanent magnets.
  • the individual segments 2 are all made the same and have a same shape. Therefore, an order and a position of a single segment within the rotor 1 are interchangeable, which facilitates assembly.
  • the illustrated embodiment of the first part 4 of the single segment 2 and the second corresponding part 5 of the adjacent individual segment 2 provides a
  • a first area from point 8a to point 8b of the part 4 forms a bulge of the individual segment 2 which corresponds to a concavity of a first area from point 8a to point 8b of the part 5 of the adjacent individual element 2 and are formed so that the bulge with the concavity both in the radial direction and in
  • a suitable dimensioning of the overlaps of the bulge of the part 4 and the concavity of the part 5 represents a form fit in the radial direction and in the circumferential direction.
  • the part 4 still contains a second area from point 8b to point 8c with a concavity of the single segment 2 to a Bulge of a second region from point 8b to point 8c of the part 5 of the adjacent individual element 2 corresponds and are also shaped so that the bulge with the concavity both in the radial direction and in
  • the bulges are designed so that no edges form, which proves advantageous when punching sheets.
  • FIG. 4 shows an alternative exemplary embodiment of a rotor 11 with individual segments 12, in which some features coincide with the rotor 1 from FIG. 3, so that essentially the differences are described here and the same or equivalent components from FIG.
  • a concavity of a first portion of a second portion 15 of the single segment 12 from point 18a to point 18b is shaped such that the concavity extends to an opening 13, 13a, 13b in the axial direction, which serves to receive a permanent magnet 10.
  • a deformable region 16 is arranged at the opening 13, 13 a, 13 b. The deformable region 16 is between the opening 13, 13a, 13b and a first part 14 of the
  • Single segment 12 is arranged and forms with the concavity of the first portion of the second part 15, which reaches up to the opening 13, 13 a, 13 b, between a third movable part 17 a, 17 b of the single segment 12.
  • the deformable portion 16 on one side of the opening thirteenth , 13a, 13b and the concavity to the opening 13, 13a, 13b in the circumferential direction on the other side of the opening 13, 13a, 13b is with the movable third part 17a, 17b therebetween a radial extension of the axial Opening 13, 13a, 13b changeable.
  • the movable third part 17a and the movable third part 17b different positions of a same component are shown, as well as the resulting different shapes of the corresponding openings 13a, 13b.
  • a second region from point 18b to point 18c of the part 15 of the single segment 12 and a second region from point 18b to point 18c of a part 14 of an adjacent individual segment 12 are analogous to FIG. 3 a form fit in the radial direction and in the circumferential direction between the two adjacent individual segments 12 dar.
  • the possibility of a change in the radial displacement of the opening 13, 13 a, 13 b in the axial direction facilitates insertion of the permanent magnet 10 in the opening 13, 13 a, 13 b. If the third movable part 17a of the individual segment 12 is in a position with an enlarged radial extension of the opening 13a, as shown in FIG. 4, the permanent magnet 10 can be inserted into the axial opening 13a with little effort. If, after the insertion of the permanent magnet 10, the third movable part 17b is moved to a position with a reduced radial extent of the axial opening 13b, the axial opening 13b is thereby closed in the radial direction and the
  • the movable part 17b is fixed in the closed position by a bulge of a first area from point 18a to point 18b of the part 14 of the single segment 12.
  • the concavity of the first region from point 8a to point 8b of the part 15 with the bulge of the first region from point 8a to point 8b of the part 14 of the adjacent individual segment 12 forms such a low overlap that with an external force the movable part 17b in a movement to fix the permanent magnet 10 can overcome the overlap but after the fixation of the permanent magnet 10, a contact force of the movable member 17b on the permanent magnet 10 is a small internal force that is not large enough to overcome the overlap.
  • the slight overlap of the first portion of the member 14 with the first portion of the member 15 holds the movable member 17a, 17b in position and fixes it as shown in the movable member 17b while fixing the permanent magnet 10 in the opening 13b.
  • the contact pressure on the permanent magnet 10 is always smaller than a critical force, from which structural damage to the permanent magnet 10 can occur. Further fastening means and fastening steps of the permanent magnet 10 are omitted. It is also advantageous in FIG. 4 that the movable part 17a, 17b of the
  • Single element 12 is located in the radial direction within the axial opening 13, 13 a, 13 b, since the fixation of the movable member 17 a, 17 b and the fixation of the
  • Permanent magnets 10 in the opening 13, 13a, 13b is reinforced by the outwardly acting centrifugal forces of the rotating rotor 11 and by the pressing of the rotor 11 on a rotor carrier.
  • the bulges and indentations of the part 14 and the part 15 are again designed edge-free, since these forms simplify the work when punching the sheets.
  • FIG. 5 shows an alternative exemplary embodiment of a rotor 21 with individual segments 22, in which some features coincide with the rotor 11 from FIG. 4, so that essentially the differences are described here and identical or equivalent components from FIG. 4 are to be adopted.
  • the rotor 21 in FIG. 5 is only partially joined in the illustration, so that not all the individual segments 22 have yet been inserted and not every individual segment 22 has an adjacent individual segment 22 on both sides.
  • the individual segments 22 are all executed the same and in this mounting state a better
  • the individual segments 22 have a designation suffix a, b to distinguish a single segment 22a with only one adjacent single segment 22 from a single segment 22b with two adjacent individual segments 22.
  • the single segment 22 has a first part 24 and a second part 25, wherein the first part 24 of a single segment 22 with the second part 25 of an adjacent single segment 22 in the assembled state results in a positive connection in the circumferential direction and in the radial direction.
  • the individual segment 22 has an opening 23a, 23b in the axial direction for receiving a permanent magnet 20.
  • a deformable region 26a, 26b is arranged.
  • the individual segment 22a is positively connected in this mounting state via the second part 25 of the individual segment 22a to the first part 24 of the adjacent individual segment 22b.
  • the first part 24a of the individual segment 22a still has no connection to an adjacent individual segment 22.
  • the first part 24a, the opening 23a and the deformable area 26a, which is arranged between the opening 23a and the first part 24a of the single segment 22a, are in their original position Form shown without deformed by an external force, the deformable portion 26 a.
  • the opening 23a is designed in its basic form such that the permanent magnet 20 can be inserted easily and without great effort into the opening 23a.
  • an extension of the opening 23a in the radial direction and / or in the circumferential direction can be greater than the respective extent of the
  • the permanent magnet 20 is inserted in this mounting state in the opening 23 a, before in another assembly step another
  • Single segment 22 is connected to the first part 24a of the single segment 22a.
  • the individual segment 22b has two adjacent individual segments 22, so that both via the first part 24 of the single segment 22b and via the second part 25b single segment 22b a positive connection to an adjacent
  • Single segment 22 is made. By joining the second part 25 of the individual segments 22a with the first part 24 of the single segment 22b, an external force is exerted, which upon assembly of the individual segment 22a with the
  • Circumferential direction and / or radial direction is reduced.
  • a reduction of the opening 23b in the assembly of the individual segments 22 through the deformable portion 26b generates a pressing force of the opening 23b on the permanent magnet 20, so that the permanent magnet 20 is fixed by the pressing force in the opening 23b.
  • the contact pressure on the permanent magnet 20 is always smaller than a critical force, from which structural damage to the permanent magnet 20 can arise.
  • the deformable region can also be arranged between a second part of the individual segment and the opening in the axial direction for receiving a permanent magnet, or in each case a deformable region between the first part and the opening and between the second part and the opening be arranged.
  • a respective deformation of a deformable region may be small in two deformable regions on both sides of the opening for receiving a permanent magnet and still fix the permanent magnet by an overall reduction of the opening in the opening. A necessary for deformation of the deformable area external
  • FIG. 6 shows an alternative exemplary embodiment of a rotor 31 with individual segments 32, in which some features coincide with the rotor 21 from FIG. 5, so that essentially the differences are described here and the same or equivalent components from FIG. 5 are to be adopted.
  • the rotor 31 in FIG. 6 is only partially joined in the illustration, so that not all the individual segments 32 have yet been inserted and not every individual segment 32 has an adjacent individual segment 32 on both sides.
  • the individual segments 32 are all executed the same and in this mounting state a better
  • the individual segments 32 have a designation suffix a, b to distinguish a single segment 32a with only one adjacent single segment 32 from a single segment 32b with two adjacent individual segments 32.
  • the individual segment 32 has a first part 34 and a second part 35, wherein the first part 34 of a single segment 32 with the second part 35 of an adjacent individual segment 32 in the assembled state results in a positive connection in the circumferential direction and in the radial direction.
  • the individual segment 32 has an opening 33a, 33b in the axial direction for receiving a permanent magnet 30.
  • a deformable region 36a, 36b is arranged, wherein a portion 36c of the deformable region 36a, 36b is arranged in the radial direction within the opening 33a, 33b.
  • the partial region 36c of the deformable region 36a, 36b circumferentially overlaps with the opening 33a, 33b, so that upon deformation of the deformable region 36a, 36b, the partial region 36c reduces the opening 33a, 33b in the radial direction.
  • Permanent magnet 30 is inserted into the opening 33a, 33b prior to deformation.
  • the reduction of the opening 33a, 33b in the radial direction by the deformation of the portion 36c of the permanent magnet 30 is fixed by pressing forces of the opening 33a, 33b in the opening 33a, 33b.
  • the deformable region 36a and the opening 33a are still undeformed and show a shape of the individual segment 32a before being joined to the rotor 31.
  • the deformable portion 36b has been deformed in the assembling step of assembling the single segment 32a with the single segment 32b such that the opening 33b is reduced in the circumferential direction and fixed the permanent magnet in the opening 33b.
  • the opening 33b has in the overlap region with the portion 36c of the deformable region 36b still an extension in the radial direction, which is larger than the permanent magnet 30.
  • Extension of the opening 33a, 33b is reduced in the radial direction.
  • the reduction of the opening 33a, 33b in the radial direction generates a pressing force of the opening 33a, 33b on the permanent magnet 30, which fixes the permanent magnet in the opening 33a, 33b.
  • deformation of the portion 36c may also be accompanied by deformation of the deformable portion 36a, 36b during assembly
  • Single segments 32 are made to the rotor 31, in which between the first part 34 of a single segment 32 and the second part 35 of an adjacent single segment 32 at a position in the radial direction within the opening 33 a, 33 b through the
  • the contact pressure on the permanent magnet 30 is always smaller than a critical force, from which structural damage to the permanent magnet 30 can occur.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

L'invention concerne un rotor (1) de machine électrique formé de segments individuels (2), chaque segment individuel (2) comportant une première partie (4) en contact avec une deuxième partie (5) correspondante du segment individuel voisin à l'état monté. La première partie (4) du segment individuel et la deuxième partie (5) correspondante du segment individuel voisin sont conçues de manière à former un assemblage par complémentarité de forme dans la direction radiale périphérique entre la première partie (4) et la deuxième partie (5). Cet assemblage par complémentarité de forme dans la direction radiale périphérique confère au rotor (1) assemblé une structure annulaire autoportante. Ainsi, ni fixation ni dispositif de maintien supplémentaires ne sont nécessaires à l'assemblage des segments individuels (2) pour former la bague du rotor.
EP10771660A 2009-11-10 2010-10-19 Rotor de machine électrique Withdrawn EP2499718A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009052596A DE102009052596A1 (de) 2009-11-10 2009-11-10 Rotor einer elektrischen Maschine
PCT/EP2010/006386 WO2011057703A1 (fr) 2009-11-10 2010-10-19 Rotor de machine électrique

Publications (1)

Publication Number Publication Date
EP2499718A1 true EP2499718A1 (fr) 2012-09-19

Family

ID=43743719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10771660A Withdrawn EP2499718A1 (fr) 2009-11-10 2010-10-19 Rotor de machine électrique

Country Status (6)

Country Link
US (1) US9825494B2 (fr)
EP (1) EP2499718A1 (fr)
JP (1) JP5619909B2 (fr)
CN (1) CN102598477A (fr)
DE (1) DE102009052596A1 (fr)
WO (1) WO2011057703A1 (fr)

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JP2013510554A (ja) 2013-03-21
US9825494B2 (en) 2017-11-21
CN102598477A (zh) 2012-07-18
WO2011057703A1 (fr) 2011-05-19
DE102009052596A1 (de) 2011-05-12
JP5619909B2 (ja) 2014-11-05
US20120206006A1 (en) 2012-08-16

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