WO2023089924A1 - エンコーダカバーおよびモータ - Google Patents
エンコーダカバーおよびモータ Download PDFInfo
- Publication number
- WO2023089924A1 WO2023089924A1 PCT/JP2022/033964 JP2022033964W WO2023089924A1 WO 2023089924 A1 WO2023089924 A1 WO 2023089924A1 JP 2022033964 W JP2022033964 W JP 2022033964W WO 2023089924 A1 WO2023089924 A1 WO 2023089924A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- encoder
- cover member
- cover
- flange
- motor
- Prior art date
Links
- 239000011347 resin Substances 0.000 claims description 20
- 229920005989 resin Polymers 0.000 claims description 20
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 13
- 239000004020 conductor Substances 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 239000000463 material Substances 0.000 description 16
- 229910052742 iron Inorganic materials 0.000 description 8
- 239000004677 Nylon Substances 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 229920001778 nylon Polymers 0.000 description 7
- 230000004308 accommodation Effects 0.000 description 5
- 230000005684 electric field Effects 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910021397 glassy carbon Inorganic materials 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000737 Duralumin Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
- G01D5/245—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
- G01P1/02—Housings
- G01P1/026—Housings for speed measuring devices, e.g. pulse generator
Definitions
- the present disclosure relates to an encoder cover that covers an encoder that detects the rotational position of a shaft of a motor, and a motor that includes the same.
- Patent Document 1 there is known an encoder cover that covers an encoder that detects the rotational position of the shaft of a motor (for example, Patent Document 1).
- the encoder cover of Patent Literature 1 includes an encoder housing portion for housing an encoder and a flange portion for joining with a motor bracket.
- the encoder housing portion and the flange portion are integrally formed of a conductive die-cast alloy.
- the encoder cover includes a flange for attaching an encoder, a first cover member provided at a position opposite to the flange when viewed from the encoder and covering a portion of the encoder, and connecting the flange and the first cover member. and a second cover member covering a portion of the encoder, wherein the thermal conductivity of the second cover member is smaller than the thermal conductivity of the flange and the thermal conductivity of the first cover member.
- the motor includes the encoder cover described above, an encoder housed in the encoder cover, and a main body having a shaft whose rotational position is detected by the encoder.
- FIG. 1 is a perspective view showing an example of an encoder cover according to an embodiment of the present disclosure
- Fig. 4 is a top view of an encoder cover according to an embodiment of the present disclosure
- FIG. 3 is a cross-sectional view taken along line III--III of FIG. 2, showing a motor shaft and the like;
- An encoder cover is an encoder cover that covers an encoder that detects the rotational position of a shaft of a motor, and includes a flange, a first cover member, and a second cover member.
- the motor includes a body having a rotor including a shaft and a stator facing the rotor with a gap therebetween.
- the flange is a member for attaching the encoder.
- the flange may have through holes through which mounting screws are inserted for mounting the flange to the motor bracket.
- the flange may be mounted with an encoder and bearings that rotatably support the shaft of the motor.
- a rotating plate provided by the encoder may be attached to the shaft of the motor.
- the first cover member is provided at a position opposite to the flange when viewed from the encoder.
- the first cover member covers part of the encoder.
- the first cover member may be lid-shaped.
- the second cover member connects the flange and the first cover member.
- the second cover member covers part of the encoder.
- a second cover member may be provided between the flange and the first cover member.
- the second cover member may be tubular.
- a housing space in which the encoder is housed may be defined by the flange, the first cover member, and the second cover member. This accommodation space may be a closed space.
- the thermal conductivity of the second cover member is smaller than the thermal conductivity of the flange and the thermal conductivity of the first cover member.
- Such a second cover member suppresses heat conduction between the flange and the first cover member and the second cover member. Therefore, even if heat is generated in the motor main body, the heat is less likely to be transmitted to the first cover member and the second cover member via the flange, and the heat is not transferred to the inside of the encoder cover, that is, the space where the encoder is accommodated. Hard to get stuck. Therefore, it is possible to suppress heat transfer from the motor main body to the encoder.
- the first cover member and the flange may each be made of a conductive material.
- a conductive material a metal, a carbon material represented by glassy carbon, or a conductive resin can be used.
- the first cover member may be made of a first metal (eg, aluminum, aluminum alloy).
- the first cover member made of the first metal has high thermal conductivity. Therefore, even if heat builds up inside the encoder cover, the heat can be dissipated to the outside through the first cover member. Therefore, it is possible to further prevent the normal operation of the encoder from being hindered by heat.
- the second cover member may be made of the first resin (for example, nylon resin).
- the second cover member made of the first resin has low thermal conductivity. Therefore, the heat insulation function of the second cover member can be easily ensured.
- the encoder cover may further include a magnetic shield member fixed to the first cover member and covering at least a portion of the encoder.
- the magnetic shield member may be made of a second metal (eg, iron, iron alloy) and may not be in contact with the flange. With such a magnetic shield member, the influence of magnetic noise on the encoder can be suppressed.
- the magnetic shield member is made of a second metal having a high thermal conductivity for its function. When the magnetic shield member is not in contact with the flange, heat transfer from the flange to the first cover member via the magnetic shield member is suppressed, thereby avoiding heat buildup inside the encoder cover.
- the second metal may be of the same kind as or different from the first metal.
- the first cover member may be fixed to the flange with a conductive bolt (for example, an iron bolt).
- a conductive bolt for example, an iron bolt.
- the second cover member may have a housing for the connector.
- the housing may be made of a second resin (for example, nylon resin).
- the connector may be a connector to which wiring for transmitting the detection signal of the encoder is connected. According to such a configuration, since it is not necessary to provide the housing of the connector separately from the second cover member, the manufacturing cost of the encoder cover can be reduced.
- the second resin may be of the same type as the first resin, or may be of a different type.
- a portion of the second cover member other than the housing and the housing may be integrally formed. With this configuration, it is possible to easily manufacture the second cover member having the housing. In addition, the encoder cover can be assembled more easily than when the housing is separate from the portion of the second cover member other than the housing.
- the length of the second cover member in the axial direction of the shaft of the motor may be half or more of the length of the encoder cover. With such a length of the second cover member, the heat insulating function of the second cover member can be further enhanced.
- a motor includes the encoder cover described above, an encoder housed in the encoder cover, and a body having a shaft whose rotational position is detected by the encoder.
- the main body may have a rotor including a shaft and a stator facing the rotor with a gap therebetween.
- the motor may be an inner rotor type three-phase synchronous motor, but is not limited to this.
- the encoder may be a multi-rotation absolute encoder (an absolute encoder that detects the rotational position and number of rotations of a shaft), but is not limited to this.
- the encoder may or may not have a battery.
- FIG. 1 is a perspective view showing an example of an encoder cover 10 according to one embodiment of the present disclosure.
- FIG. 2 is a top view of the encoder cover 10.
- FIG. 3 is a cross-sectional view taken along line III--III of FIG. 2, showing the shaft 41 of the motor 1 and the like.
- the motor 1 includes an encoder cover 10, an encoder 20, and a main body 40 having a rotor including a shaft 41 and a stator.
- the motor 1 of the present embodiment is an inner rotor type three-phase synchronous motor, but is not limited to this.
- the encoder cover 10 is an element that covers the encoder 20, and has a flange 11, a first cover member 12, a second cover member 13, and a magnetic shield member 14.
- the flange 11 is a member for attaching the encoder 20 .
- the flange 11 of this embodiment is made of aluminum (an example of the third metal), but is not limited to this.
- the flange 11 may be made of stainless steel.
- the flange 11 has an insertion hole 11a through which a mounting screw for mounting itself to the bracket 42 of the motor 1 is inserted. In this example, four insertion holes 11a are provided, but the number of insertion holes 11a is not limited to this.
- a bearing 50 that rotatably supports the shaft 41 is attached.
- An annular magnetic shield plate 11 c made of iron, for example, is embedded in the flange 11 .
- a magnetic material is desirable as the material of the magnetic shield plate 11c, and an iron alloy such as stainless steel can be used instead of iron.
- the first cover member 12 is provided at a position opposite to the flange 11 when viewed from the encoder 20 (on the left side of the encoder 20 on the paper surface of FIG. 3).
- the first cover member 12 of the present embodiment is made of aluminum (first metal) as a conductive material, but is not limited to this.
- a material having a high thermal conductivity is particularly desirable, and other than aluminum, for example, an aluminum alloy such as duralumin, copper, or an alloy containing copper can be used.
- the first cover member 12 partially covers the encoder 20 . In this example, the first cover member 12 covers the top of the encoder 20 .
- the first cover member 12 has a lid shape, but is not limited to this.
- first cover member 12 and the flange 11 may each be made of a conductive material.
- a conductive material in addition to the materials described above, a metal, a carbon material represented by glassy carbon, or a conductive resin can be used. The same material or different materials may be used for the first cover member 12 and the flange 11 .
- the first cover member 12 is fixed to the flange 11 with iron bolts 60 .
- four bolts 60 are provided, but the number of bolts 60 is not limited to this.
- Each bolt 60 is screwed into the bolt hole 11b of the flange 11 via the first through hole 12a of the first cover member 12 and the second through hole 13b of the second cover member 13.
- the material of the bolt 60 is desirably conductive, and is not limited to iron, and can be aluminum, stainless steel, brass, or the like.
- a second cover member 13 is provided between the flange 11 and the first cover member 12 .
- the second cover member 13 connects the flange 11 and the first cover member 12 .
- the second cover member 13 is fixed to the first cover member 12 at one end 13e and fixed to the flange 11 at the other end 13f.
- the second cover member 13 of the present embodiment is made of nylon resin (first resin), but is not limited to this.
- first resin nylon resin
- the second cover member 13 partially covers the encoder 20 .
- the second cover member 13 covers the side surface of the encoder 20 .
- the second cover member 13 has a cylindrical shape, but is not limited to this.
- the second cover member 13 has a housing 13 a for the connector 31 .
- the housing 13a accommodates the connector 31 so that the external terminals 31a of the connector 31 are exposed.
- a portion of the second cover member 13 other than the housing 13a and the housing 13a are integrally formed.
- the housing 13a of the present embodiment is made of nylon resin (second resin), but is not limited to this.
- As the material of the housing 13a a material having a low thermal conductivity is desirable, and polystyrene or the like can be used in addition to the nylon resin.
- a wiring 32 for transmitting a detection signal of the encoder 20 is connected to the connector 31 .
- the first resin and the second resin may be made of the same material or different materials.
- the thermal conductivity of the second cover member 13 made of nylon resin is smaller than the thermal conductivity of the flange 11 made of aluminum and the thermal conductivity of the first cover member 12 made of aluminum. Therefore, even if heat is generated in the body portion 40 , the heat is less likely to be transmitted to the first cover member 12 and the second cover member 13 via the flange 11 . Therefore, heat is less likely to accumulate in an accommodation space S, which will be described later, and transmission of heat from the main body 40 to the encoder 20 is suppressed.
- the flange 11, the first cover member 12, and the second cover member 13 define an accommodation space S in which the encoder 20 is accommodated.
- the accommodation space S is a closed space.
- the magnetic shield member 14 is fixed to the first cover member 12 .
- the magnetic shield member 14 of the present embodiment is made of iron (second metal), but is not limited to this.
- a magnetic material is desirable as the material of the magnetic shield member 14, and nickel, stainless steel, or the like can be used as the material other than iron.
- the magnetic shield member 14 covers at least part of the encoder 20 . In this example, the magnetic shield member 14 covers the top and side portions of the encoder 20 .
- the magnetic shield member 14 of this embodiment has a cylindrical shape with a bottom, but is not limited to this. Magnetic shield member 14 is not in contact with flange 11 . In this example, a predetermined gap exists between the tip 14 e of the magnetic shield member 14 and the flange 11 .
- the encoder 20 is an element that detects the rotational position and number of rotations of the shaft 41 .
- the encoder 20 of the present embodiment is a battery-powered multi-rotation absolute encoder, but is not limited to this.
- Encoder 20 has a rotating plate 21 fixed to shaft 41 .
- the encoder 20 detects the rotational position and number of rotations of the shaft 41 by reading a predetermined pattern of the rotating plate 21 .
- the shaft 41 is a member that extends in the direction along the rotation axis C of the rotor (horizontal direction on the paper surface of FIG. 3).
- a shaft 41 is fixed to the rotor and rotates with the rotor.
- Shaft 41 is rotatably supported by bearings 50 .
- the present disclosure can be used for encoder covers and motors.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
Description
本開示に係るエンコーダカバーは、モータのシャフトの回転位置を検出するエンコーダを覆うエンコーダカバーであって、フランジと、第1カバー部材と、第2カバー部材とを備える。モータは、シャフトを含むロータと、ロータとギャップを介して対向するステータとを有する本体部を備える。
本開示の別の一実施形態に係るモータは、上述のエンコーダカバーと、エンコーダカバーに収容されるエンコーダと、エンコーダによって回転位置が検出されるシャフトを有する本体部と、を備える。本体部は、シャフトを含むロータと、ロータとギャップを介して対向するステータとを有してもよい。モータは、インナーロータ型の三相同期電動機であってもよいが、これに限られるものではない。エンコーダは、多回転アブソリュートエンコーダ(シャフトの回転位置および回転数を検出するアブソリュート方式のエンコーダ)であってもよいが、これに限られるものではない。エンコーダは、バッテリを備えてもよく、バッテリを備えなくてもよい。
10:エンコーダカバー
11:フランジ
11a:挿通孔
11b:ボルト孔
11c:磁気シールド板
12:第1カバー部材
12a:第1貫通孔
13:第2カバー部材
13a:筐体
13b:第2貫通孔
13e:一端
13f:他端
14:磁気シールド部材
14e:先端
20:エンコーダ
21:回転板
31:コネクタ
31a:外部端子
32:配線
40:本体部
41:シャフト
42:ブラケット
50:ベアリング
60:ボルト
S:収容空間
Claims (9)
- エンコーダを覆うエンコーダカバーであって、
前記エンコーダを取り付けるフランジと、
前記エンコーダからみて前記フランジと反対側の位置に設けられ、前記エンコーダの一部を覆う第1カバー部材と、
前記フランジと前記第1カバー部材とを接続すると共に、前記エンコーダの一部を覆う第2カバー部材と、
を備え、
前記第2カバー部材の熱伝導率は、前記フランジの熱伝導率および前記第1カバー部材の熱伝導率よりも小さい、エンコーダカバー。 - 前記第1カバー部材および前記フランジは、それぞれ導電性材料で構成される、請求項1に記載のエンコーダカバー。
- 前記第1カバー部材は、第1金属で構成される、請求項1または2に記載のエンコーダカバー。
- 前記第2カバー部材は、第1樹脂で構成される、請求項1~3のいずれか1項に記載のエンコーダカバー。
- 前記第1カバー部材に固定され、前記エンコーダの少なくとも一部を覆う磁気シールド部材をさらに備え、
前記磁気シールド部材は、第2金属で構成されかつ前記フランジと接触していない、請求項1~4のいずれか1項に記載のエンコーダカバー。 - 前記第1カバー部材は、導電性を有するボルトにより前記フランジに固定されている、請求項1~5のいずれか1項に記載のエンコーダカバー。
- 前記第2カバー部材は、コネクタの筐体を有し、
前記筐体は、第2樹脂で構成されている、請求項1~6のいずれか1項に記載のエンコーダカバー。 - 前記第2カバー部材の前記筐体以外の部分と前記筐体とが、一体形成されている、請求項7に記載のエンコーダカバー。
- 請求項1~8のいずれか1項に記載のエンコーダカバーと、
前記エンコーダカバーに収容されるエンコーダと、
前記エンコーダによって回転位置が検出されるシャフトを有する本体部と、
を備える、モータ。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22895211.5A EP4435384A1 (en) | 2021-11-17 | 2022-09-09 | Encoder cover and motor |
JP2023562152A JPWO2023089924A1 (ja) | 2021-11-17 | 2022-09-09 | |
CN202280071303.5A CN118159804A (zh) | 2021-11-17 | 2022-09-09 | 编码器罩及马达 |
Applications Claiming Priority (2)
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JP2021187232 | 2021-11-17 | ||
JP2021-187232 | 2021-11-17 |
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WO2023089924A1 true WO2023089924A1 (ja) | 2023-05-25 |
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PCT/JP2022/033964 WO2023089924A1 (ja) | 2021-11-17 | 2022-09-09 | エンコーダカバーおよびモータ |
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EP (1) | EP4435384A1 (ja) |
JP (1) | JPWO2023089924A1 (ja) |
CN (1) | CN118159804A (ja) |
WO (1) | WO2023089924A1 (ja) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004257894A (ja) * | 2003-02-26 | 2004-09-16 | Hitachi Unisia Automotive Ltd | 回動角検出装置 |
JP2007057322A (ja) * | 2005-08-23 | 2007-03-08 | Hitachi Ltd | 回転角度検出装置 |
WO2010026752A1 (ja) * | 2008-09-05 | 2010-03-11 | 日本電産サンキョー株式会社 | 磁気式回転検出装置およびその製造方法 |
JP2014099983A (ja) * | 2012-11-14 | 2014-05-29 | Nidec Sankyo Corp | ドライバ一体型モータ |
JP2015001511A (ja) | 2013-06-18 | 2015-01-05 | 山洋電気株式会社 | エンコーダカバー |
JP2015111093A (ja) * | 2013-10-28 | 2015-06-18 | 日本電産サンキョー株式会社 | センサ装置 |
JP2015224972A (ja) * | 2014-05-28 | 2015-12-14 | アイシン精機株式会社 | センサ実装基板、該基板を備えた変位検知装置、及び該装置を備えた車両の後輪操舵装置 |
US20210080288A1 (en) * | 2018-01-04 | 2021-03-18 | Lg Innotek Co., Ltd. | Sensing device |
-
2022
- 2022-09-09 WO PCT/JP2022/033964 patent/WO2023089924A1/ja active Application Filing
- 2022-09-09 CN CN202280071303.5A patent/CN118159804A/zh active Pending
- 2022-09-09 EP EP22895211.5A patent/EP4435384A1/en active Pending
- 2022-09-09 JP JP2023562152A patent/JPWO2023089924A1/ja active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004257894A (ja) * | 2003-02-26 | 2004-09-16 | Hitachi Unisia Automotive Ltd | 回動角検出装置 |
JP2007057322A (ja) * | 2005-08-23 | 2007-03-08 | Hitachi Ltd | 回転角度検出装置 |
WO2010026752A1 (ja) * | 2008-09-05 | 2010-03-11 | 日本電産サンキョー株式会社 | 磁気式回転検出装置およびその製造方法 |
JP2014099983A (ja) * | 2012-11-14 | 2014-05-29 | Nidec Sankyo Corp | ドライバ一体型モータ |
JP2015001511A (ja) | 2013-06-18 | 2015-01-05 | 山洋電気株式会社 | エンコーダカバー |
JP2015111093A (ja) * | 2013-10-28 | 2015-06-18 | 日本電産サンキョー株式会社 | センサ装置 |
JP2015224972A (ja) * | 2014-05-28 | 2015-12-14 | アイシン精機株式会社 | センサ実装基板、該基板を備えた変位検知装置、及び該装置を備えた車両の後輪操舵装置 |
US20210080288A1 (en) * | 2018-01-04 | 2021-03-18 | Lg Innotek Co., Ltd. | Sensing device |
Also Published As
Publication number | Publication date |
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CN118159804A (zh) | 2024-06-07 |
EP4435384A1 (en) | 2024-09-25 |
JPWO2023089924A1 (ja) | 2023-05-25 |
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