An electric motorcycle controller and its assembly method

Abstract

The application provides an electric motorcycle controller and an assembling method thereof, and relates to the technical field of electric vehicle control.The electric motorcycle controller comprises a power module, a control panel, a bottom shell and a stamping mounting piece.The power module is composed of a power tube and a copper strip which are welded on a power board.The control panel is provided with a solder pad on the back surface, and the power module is directly integrated on the back surface of the control panel by patch welding.The PET sheet is pasted on the long sides of the bottom shell, and the inside is filled with heat-conducting glue to form a sealing layer.The stamping mounting piece is clamped in the groove on the short sides of the bottom shell.After the stamping mounting piece is locked by the stamping locking screw, the mounting surface, the convex bump and the locking point of the stamping mounting piece form a bearing triangular structure.The electric motorcycle controller uses the copper strip to replace the copper sleeve and the pin array to realize the current and driving connection between the power board and the control panel.The PET sheet is pasted on the long sides of the bottom shell, and then the glue is filled inside, so as to realize the waterproof, creepage distance protection, heat capacity heat absorption and heat conduction, and the bearing triangular structure makes the controller be installed on the whole vehicle and be connected stably.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric motorcycle control, in particular to an electric motorcycle controller and an assembling method thereof. BACKGROUND

[0002] At present, the electric motorcycle controller generally adopts a layered structure design. In actual application, the power tube, copper sleeve and pin are welded on the aluminum-based power plate, and are connected to the control plate through the aluminum sleeve and pin. A space of ≥5mm must be reserved between the power plate and the control plate to avoid interference between circuits, which leads to an excessive height of the whole machine, affecting the design compactness. The pin connection is prone to looseness in a continuously vibrating environment, causing a signal instantaneous interruption and leading to a system failure rate of >3‰, affecting the reliability and stability of the product.

[0003] Moreover, the packaging surface of the power tube is close to the back of the control plate, causing heat accumulation in the closed cavity and making it difficult to effectively dissipate heat. The installation of the die-cast aluminum bottom shell is integrally formed. In order to protect the creepage distance, the outer diameter of the copper sleeve must be large, the power plate occupies a large area, and the cost of the aluminum substrate and the copper sleeve is high, which cannot meet the installation requirements of different vehicle models and limits the compatibility of the product. SUMMARY

[0004] Therefore, in order to solve the circuit connection and heat dissipation defects of the electric motorcycle controller, the present application aims to provide an electric motorcycle controller and an assembling method thereof. The integrated circuit module realizes zero layer spacing, eliminates the influence of pin connection, adopts a composite heat dissipation and waterproof design, improves the heat capacity and heat absorption capacity, establishes a heat dissipation path of the power tube, potting glue, bottom shell and air, and adapts to the installation requirements of different vehicle models.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] Based on the above-mentioned purpose, in the first aspect, the present application provides an electric motorcycle controller, comprising:

[0007] A power module composed of a power tube and a copper strip patch welded on a power plate;

[0008] A control plate, the back of the control plate is provided with a solder pad, and the power module is directly integrated on the back of the control plate through patch welding;

[0009] A bottom shell, the long sides of which are pasted with PET sheets, and the inside of which is filled with heat-conducting glue to form a sealing layer;

[0010] A stamping mounting piece clamped in the groove on both sides of the short side of the bottom shell, the mounting surface, convex bundle and locking point of the stamping mounting piece form a force triangle structure after the stamping mounting piece is locked by a stamping locking screw.

[0011] The electric motorcycle controller of the present application uses copper bars to replace copper sleeves and pin arrays to realize current and driving connection of power boards and control boards; after PET sheets are pasted on both sides of the long side of the bottom shell, glue is poured into the interior to realize waterproofing, creepage distance protection, heat capacity heat absorption and heat conduction, form a force-bearing triangular structure to enable the controller to be stably connected when installed on a whole vehicle.

[0012] As a further scheme of the present application, the copper bar is a long strip-shaped conductor with a thickness of 0.6-1.0 mm and a length-width ratio of ≥5:1, which is used to replace traditional copper sleeves and pin arrays to realize current and signal transmission.

[0013] As a further scheme of the present application, the heat conduction coefficient of the heat-conducting glue is ≥1 W / m·℃, and the heat conduction path is: power tube heat→sealing layer→bottom shell→air; IP67 level waterproof sealing; creepage distance protection (voltage resistance ≥3 kV).

[0014] As a further scheme of the present application, the force-bearing triangular structure is composed of the mounting surface, the convex bump and the locking point of the stamping mounting piece, and the shear resistance is ≥800 N.

[0015] As a further scheme of the present application, a heat-conducting silicone grease layer is coated on the boss of the bottom shell, the power module is directly integrated on the back of the control board through patch welding and placed on the heat-conducting silicone grease layer of the boss of the bottom shell, and the bottom shell locking screw is used for compression locking.

[0016] As a further scheme of the present application, the control board is compression fixed on the convex bump by using 4 M3 bottom shell locking screws.

[0017] As a further scheme of the present application, the control board is further provided with a first capacitor cover and a second capacitor cover, and the first capacitor cover and the second capacitor cover are clamped into the predetermined position of the control board.

[0018] As a further scheme of the present application, after the stamping mounting piece is clamped in the groove on both sides of the short side of the bottom shell, 2 M3 stamping locking screws are used for locking to the bottom shell.

[0019] As a further scheme of the present application, after the PET sheets are pasted on both sides of the long side of the bottom shell, glue is poured into the interior to complete the assembly.

[0020] In the second aspect, the present application further provides an assembly method of an electric motorcycle controller, comprising the following steps:

[0021] (a) patch welding the power tube and the copper bar to the power board to form a power module;

[0022] (b) patch welding the power module to the back pad of the control board;

[0023] (c) smearing heat-conducting silicone grease on the boss of the bottom shell, putting in the control board assembly and locking and compression with the bottom shell locking screw;

[0024] (d) snapping the first capacitor cover and the second capacitor cover into place on the control board;

[0025] (e) Insert the stamped mounting parts into the short side slots of the bottom shell and secure them with stamped locking screws to form a load-bearing triangular structure;

[0026] (f) Paste a PET sheet on the inner side of the long side of the bottom shell, inject thermal conductive glue and cure it.

[0027] As a further solution of the present invention, step (b) adopts a secondary reflow process with a peak temperature of 245°C ± 5°C and a time above liquidus of 50 seconds.

[0028] As a further solution of the present invention, in step (f), the glue pouring pressure is 0.2 MPa, the glue layer thickness is 3 mm±0.1 mm, and after curing, fixed supports for the first capacitor cover and the second capacitor cover are formed.

[0029] Compared with the prior art, the electric motorcycle controller and assembly method thereof proposed in the present invention have the following beneficial effects:

[0030] 1. This invention optimizes the electrical connection between the power board and the control board, eliminating the traditional copper sleeve and pin header connections and reducing the height difference between components. Compared with existing technologies, this invention significantly reduces the overall height, adapting to a wider range of electric motorcycle models, improving the adaptability of the installation space, and reducing the overall height of the controller. The use of interchangeable stamped mounting parts allows for the replacement of stamped parts of different shapes to suit different vehicle models, enhancing the controller's installation adaptability and flexibility.

[0031] 2. In the present invention, the power tube and copper bar are directly connected to the back of the control board through patch welding, replacing the traditional pin / female header connection method. This connection method enhances the strength and consistency of the electrical connection, greatly improves the reliability of the controller in high-vibration environments, and avoids the risk of signal loss due to loose pin / female header connections. Due to the integrated connection method, the electrical connection of the controller is more stable in long-term use and is less susceptible to changes in the external environment (such as vibration, temperature fluctuations, etc.). By eliminating the traditional fitting design between the power tube and the control board, the heat dissipation on the surface of the power board is no longer close to the control board, thereby ensuring a smooth heat dissipation convection path. The heat dissipation effect is significantly improved, which can effectively avoid the problem of controller overheating due to heat accumulation.

[0032] 3. Due to the thermal conductivity coefficient (≥1 W / m·℃) of the pouring sealant being much higher than that of air (0.025 W / m·℃), the heat capacity absorption and heat dissipation effect is effectively improved. When the controller is running at high power, the heat can be quickly conducted to the aluminum shell or the external air, avoiding the formation of a closed space and improving the heat dissipation efficiency; through the application of PET sheets on both sides of the bottom shell and the internal pouring sealant, a complete waterproof protection layer is formed, ensuring that the electric motorcycle controller can work stably in harsh environments (such as rain, humidity, etc.). The pouring sealant not only provides waterproof effect, but also enhances the creepage distance protection, ensuring electrical safety; the pouring sealant is easy to operate and can efficiently waterproof and package, while the capacitor cover only needs to be preliminarily positioned, and the capacitor cover position can be fixed after the pouring glue hardens. This simplified process improves production efficiency and reduces production cost.

[0033] 4. The application cancels the traditional copper sleeve and needle connection mode, reducing the additional material cost. In addition, the integrated patch welding technology is adopted, reducing the assembly links of multiple components in the production process, further reducing the manufacturing cost; the simplified structure and packaging process make the controller assembly more efficient. Using pouring sealant not only has good waterproof effect, but also avoids the use of traditional waterproof rings and complex sealing elements, improving the working efficiency of the production line; through the optimized heat dissipation design and waterproof packaging, the internal components of the controller are no longer in a high-temperature environment, reducing the damage to the components caused by overheating. Waterproof and creepage distance protection also enhance the reliability of the controller in extreme environments, prolonging the service life of the whole vehicle; through the design of the stamping mounting part, the mounting part can be quickly replaced according to the needs of the vehicle model, and the mounting surface adopts a triangular positioning structure to ensure the stability and reliability of the controller. This design greatly reduces the complexity of installation and maintenance.

[0034] In summary, the electric motorcycle controller provided by the application has significant advantages in structural design, heat dissipation performance, waterproofness, reliability, production efficiency and cost control, which not only effectively improves the working performance and service life of the electric motorcycle controller, but also reduces the production and maintenance cost, and improves the market competitiveness of the product.

[0035] These aspects or other aspects of the present application will be more apparent in the following description of the embodiments. It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the application or the related art, the following will briefly introduce the drawings needed to be used in the exemplary embodiments or related art description. The drawings are used to provide further understanding of the application, and constitute a part of the specification. Together with the embodiments of the application, they are used to explain the application, and do not constitute a limitation to the application. In the drawings:

[0037] Figure 1 The figure is a schematic structural diagram of an electric motorcycle controller according to an embodiment of the present invention.

[0038] Figure 2 This is a disassembled schematic diagram of an electric motorcycle controller according to an embodiment of the present invention.

[0039] Figure 3 The figure is a schematic structural diagram of a power module in an electric motorcycle controller according to an embodiment of the present invention.

[0040] Figure 4 This is a schematic cross-sectional structural diagram of an electric motorcycle controller in an embodiment of the present invention, in which a control board is assembled by locking screws of a bottom shell.

[0041] Figure 5 This is a schematic cross-sectional structural diagram of a stamped mounting part in an electric motorcycle controller according to an embodiment of the present invention, which is assembled by stamped locking screws.

[0042] Markings in the figure:

[0043] 1-power tube, 2-copper bar, 3-power board, 4-power module, 5-control board, 6-bottom shell, 7-bottom shell locking screw, 8-first capacitor cover, 9-second capacitor cover, 10-PET sheet, 11-stamping mounting part, 12-stamping locking screw. DETAILED DESCRIPTION

[0044] Below, the present application is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0045] To make the purpose, technical solutions and advantages of the present invention more clearly understood, the following is a further detailed description of the embodiments of the present invention in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0046] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are intended to distinguish two non-identical entities or non-identical parameters with the same name. Therefore, "first" and "second" are used for convenience of expression only and should not be understood as limitations on the embodiments of the present invention. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, other steps or units inherent to a process, method, system, product, or device that includes a series of steps or units.

[0047] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0048] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, combined, or partially merged, so the actual execution order may vary depending on the actual situation.

[0049] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0050] See also Figures 1 to 5 As shown, an embodiment of the present invention provides an electric motorcycle controller, including a power module 4, a control board 5, a bottom shell 6 and a stamped mounting part 11; the power module 4 is composed of a power tube 1 and a copper bar 2 soldered to a power board 3; a soldering pad is provided on the back of the control board 5, and the power module 4 is directly integrated on the back of the control board 5 by patch welding; PET sheets 10 are pasted on both sides of the long side of the bottom shell 6, and thermal conductive glue is poured inside to form a sealing layer; the stamped mounting part 11 is clamped in the slots on both sides of the short side of the bottom shell 6, and after the stamped mounting part 11 is locked by the stamped locking screw 12, the mounting surface, convex bulge and locking point of the stamped mounting part 11 form a load-bearing triangle structure.

[0051] The electric motorcycle controller of the present invention uses a copper bar 2 instead of a copper sleeve and a pin header to achieve current and drive connection between the power board 3 and the control board 5; PET sheets 10 are pasted on both sides of the long sides of the bottom shell 6 and then glue is poured into the inside to achieve waterproofing, creepage distance protection, heat absorption and heat conduction, forming a load-bearing triangle structure so that the controller can be installed on the whole vehicle and connected firmly.

[0052] In this embodiment, the copper bar 2 is a long strip conductor with a thickness of 0.6-1.0 mm and an aspect ratio of ≥5:1, and is used to replace traditional copper sleeves and pin headers to achieve current and signal transmission.

[0053] In this embodiment, the thermal conductivity of the thermal conductive adhesive is ≥1W / m·°C, and the heat conduction path is: heat from the power tube 1 → sealing layer → bottom shell 6 → air; IP67 waterproof sealing; creepage distance protection voltage ≥3kV.

[0054] Since the thermal conductivity of the pouring sealant is ≥1 W / m·℃, which is much higher than that of air 0.025 W / m·℃, the heat capacity absorption and heat dissipation effect are effectively improved. When the controller is running at high power, the heat can be quickly conducted to the aluminum shell or the external air, avoiding the formation of a closed space and improving the heat dissipation efficiency. Through the application of the PET sheet 10 on both sides of the bottom shell 6 and the internal pouring sealant, a complete waterproof protection layer is formed, ensuring that the electric motorcycle controller can work stably in harsh environments such as rain and humidity. The pouring sealant not only provides waterproof effect, but also enhances the creepage distance protection, ensuring electrical safety. The pouring sealant is easy to operate and can efficiently waterproof and package, while the capacitor cover only needs to be preliminarily positioned, and the capacitor cover position can be fixed after the pouring of the glue hardens. This simplified process improves production efficiency and reduces production cost.

[0055] In the embodiment, the force triangle structure is composed of the mounting surface, the convex bump and the locking point of the stamping mounting piece 11, and the shear resistance is ≥800 N.

[0056] In the embodiment, the bottom shell 6 is coated with a layer of heat-conducting silicone grease, the power module 4 is directly integrated on the back of the control panel 5 by patch welding, and is placed on the heat-conducting silicone grease layer of the boss of the bottom shell 6, and is pressed and locked by the bottom shell locking screw 7; wherein the control panel 5 is pressed and fixed on the boss by 4 bottom shell locking screws 7 of M3.

[0057] In the embodiment, the control panel 5 is also provided with a first capacitor cover 8 and a second capacitor cover 9, which are clamped into the predetermined position of the control panel 5.

[0058] In the embodiment, after the stamping mounting piece 11 is clamped in the groove on both sides of the short edge of the bottom shell 6, 2 stamping locking screws 12 of M3 are used to lock the bottom shell 6. Wherein, after the PET sheet 10 is pasted on both sides of the long edge of the bottom shell 6, the internal pouring of glue is completed to assemble.

[0059] The present application optimizes the electrical connection mode between the power panel 3 and the control panel 5, removes the traditional copper sleeve and pin connection, and reduces the height difference between the components. Compared with the prior art, the present application greatly reduces the overall height, adapts to more types of electric motorcycles, improves the adaptability of the installation space, and reduces the overall height of the controller; the replaceable stamping mounting piece 11 can replace different shapes of stamping pieces according to the needs of different vehicle models, enhancing the installation adaptability and flexibility of the controller.

[0060] The embodiment of the present application also provides an assembling method of an electric motorcycle controller, which comprises the following steps:

[0061] a patch welding the power tube 1 and the copper strip 2 to the power panel 3 to form a power module 4;

[0062] b patch welding the power module 4 to the back pad of the control panel 5;

[0063] c In the boss of the bottom shell 6, smear the thermal conductive silicone grease, put the control panel 5 assembly, and lock and press with the bottom shell lock screw 7;

[0064] d The first capacitor cover 8 and the second capacitor cover 9 are clamped into the control panel 5 pre-positioning;

[0065] e The stamping mounting 11 is clamped into the short edge slot of the bottom shell 6, and the stamping lock screw 12 is locked to form a force triangle structure;

[0066] f The PET sheet 10 is pasted on the inside of the long edge of the bottom shell 6, the thermal conductive glue is poured and solidified.

[0067] In this embodiment, step b adopts the secondary reflow soldering process, the peak temperature is 245℃±5℃, and the liquid phase above time is 50s. The glue pouring pressure in step f is 0.2MPa, the glue layer thickness is 3mm±0.1mm, and the fixed support of the first capacitor cover 8 and the second capacitor cover 9 is formed after solidification.

[0068] In the application, the power tube 1 and the copper strip 2 are directly connected with the back of the control panel 5 through the patch welding, which replaces the traditional pin / terminal connection mode. This connection mode enhances the strength and consistency of electrical connection, greatly improves the reliability of the controller in a high-vibration environment, and avoids the risk of signal loss caused by loose pin / terminal connection; due to the integrated connection mode, the electrical connection of the controller is more stable during long-term use and is not easily affected by external environmental changes such as vibration and temperature fluctuations; by canceling the traditional power tube 1 and the control panel 5, the heat dissipation on the surface of the power plate 3 is no longer tightly attached to the control panel 5, thereby ensuring the smoothness of the heat dissipation convection path. The heat dissipation effect is significantly improved, which can effectively avoid the overheating problem of the controller caused by heat accumulation.

[0069] By canceling the traditional copper sleeve and pin connection mode, the application reduces the additional material cost. In addition, by using the integrated patch welding technology, the assembly steps of multiple components in the production process are reduced, further reducing the manufacturing cost; the simplified structure and packaging process make the assembly of the controller more efficient. The use of potting glue packaging not only has good waterproof effect, but also avoids the use of traditional waterproof rings and complex sealing elements, improving the working efficiency of the production line; through the optimized heat dissipation design and waterproof packaging, the internal elements of the controller are no longer in a high-temperature environment, reducing the damage to the elements caused by overheating. Waterproof and creepage distance protection also enhances the reliability of the controller in extreme environments, prolonging the service life of the whole vehicle; through the design of the stamping mounting 11, the installation components can be quickly replaced according to the needs of the vehicle model, and the installation surface adopts a triangular positioning structure to ensure the stability and reliability of the controller. This design greatly reduces the complexity of installation and maintenance.

[0070] To sum up, the electric motorcycle controller provided by the present invention has significant advantages in structural design, heat dissipation performance, waterproofness, reliability, production efficiency and cost control. It can not only effectively improve the working performance and service life of the electric motorcycle controller, but also reduce production and maintenance costs, and enhance the market competitiveness of the product.

[0071] The above are exemplary embodiments disclosed in the present invention, but it should be noted that various changes and modifications may be made without departing from the scope of the embodiments disclosed in the claims. The functions, steps and / or actions of the method claims according to the disclosed embodiments described herein do not need to be performed in any particular order. In addition, although the elements disclosed in the embodiments of the present invention may be described or required in individual form, they may also be understood as multiple unless expressly limited to the singular.

[0072] It should be understood that, as used herein, the singular form "a" or "an" is intended to include the plural form as well, unless the context clearly supports an exception. It should also be understood that, as used herein, "and / or" refers to any and all possible combinations of one or more of the items listed in association. The serial numbers of the embodiments disclosed in the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0073] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to limit the scope of the disclosure of the present invention (including the claims) to these examples. Within the spirit of the present invention, the technical features of the above embodiments or different embodiments may be combined, and many other variations exist in different aspects of the above embodiments, which are not provided in detail for the sake of clarity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An electric motorcycle controller, characterized in that: include: A power module (4) is composed of a power tube (1) and a copper bar (2) soldered to a power board (3); A control board (5), wherein a soldering pad is provided on the back of the control board (5), and the power module (4) is directly integrated on the back of the control board (5) by patch welding; The bottom shell (6) has PET sheets (10) attached to both sides of the long sides, and thermally conductive glue is poured inside to form a sealing layer. A thermally conductive silicone grease layer is coated on the boss of the bottom shell (6). The power module (4) is placed on the thermally conductive silicone grease layer of the boss of the bottom shell (6) and is pressed and locked using the bottom shell locking screws (7). After the PET sheets (10) are attached to both sides of the long sides of the bottom shell (6), glue is poured inside to complete the assembly. The stamped mounting part (11) is clamped in the slots on both sides of the short side of the bottom shell (6). After the stamped mounting part (11) is locked by the stamped locking screws (12), the mounting surface, the convex bulge and the locking point of the stamped mounting part (11) form a load-bearing triangle structure.

2. The electric motorcycle controller according to claim 1, characterized in that: The copper strip (2) is a long strip conductor with a thickness of 0.6-1.0 mm and an aspect ratio of ≥5:

1.

3. The electric motorcycle controller according to claim 2, characterized in that: The thermal conductivity of the thermally conductive adhesive is ≥1W / m·°C, and the heat conduction path is: power tube (1), sealing layer, bottom shell (6) to air.

4. The electric motorcycle controller according to claim 3, characterized in that: The load-bearing triangular structure is composed of the mounting surface, convex hull and locking point of the stamped mounting part (11), and has a shear resistance of ≥800N.

5. The electric motorcycle controller according to claim 1, characterized in that: The control board (5) is fixed to the boss by four M3 bottom shell locking screws (7).

6. The electric motorcycle controller according to claim 5, characterized in that: The control board (5) is further provided with a first capacitance cover (8) and a second capacitance cover (9), and the first capacitance cover (8) and the second capacitance cover (9) are snapped into a pre-position of the control board (5).

7. The electric motorcycle controller according to claim 6, characterized in that: After the stamped mounting piece (11) is clamped in the slots on both sides of the short side of the bottom shell (6), it is locked to the bottom shell (6) using two M3 stamped locking screws (12).

8. An assembly method for an electric motorcycle controller according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: Soldering the power tube (1) and the copper bar (2) to the power board (3) to form a power module (4); Solder the power module (4) chip to the back pad of the control board (5); Apply thermal grease to the boss of the bottom shell (6), insert the control board (5) assembly, and tighten it with the bottom shell locking screws (7); The first capacitor cover (8) and the second capacitor cover (9) are clamped into the control board (5) for pre-positioning; Insert the stamped mounting piece (11) into the short side slot of the bottom shell (6) and lock it with the stamped locking screw (12) to form a load-bearing triangular structure; A PET sheet (10) is pasted on the inner side of the long side of the bottom shell (6), and heat-conducting glue is poured and solidified.

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