JP2012180818A - Blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blower whose vibration and noise are low, and which can achieve low power consumption and in which the number of components can be reduced.SOLUTION: A motor 3 is a three phase motor formed by winding three phase driving coils 35, 35B and 35C around an iron core and has a built-in driving circuit 18 supplying a coil current as a driving current to the driving coils 35, 35B and 35C of the motor 3. The driving circuit 18 dispenses with the position sensing element of a rotor. Vibration and noise of a fan motor can be reduced by adopting the three phase motor as the motor 3 to reduce torque variation from the conventional one. The efficiency of the fan motor is enhanced, so that power consumption can be reduced. The number of components as the fan motor can be reduced by dispensing with the position sensing element.

Description

  The present invention relates to a blower device having a rotating rotor.

  As this type of air blower, a centrifugal fan of a fan motor as shown in Patent Documents 1 and 2, which has an intake port in the thrust direction of the rotating centrifugal fan and an exhaust port in the radial direction of the centrifugal fan It has been known.

  Conventionally, a two-phase DC (direct current) brushless motor has been used as a method of driving the fan motor as described above. In the case of the two-phase system, because of the motor structure, the rotational torque becomes zero every 180 ° in electrical angle, so the rotational torque does not become zero by synthesizing the cogging torque generated by the stator magnetic pole and the rotor magnet. Ingenuity has been made.

JP-A-11-141499 JP 2008-255865 A

  However, in the conventional blower described above, the torque fluctuation is large, and the vibration and noise of the fan motor are increased. In addition, the efficiency as a fan motor is poor, and power consumption is also a problem.

  SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a blower device that achieves low vibration and noise, and achieves low power consumption.

  In the invention of claim 1, by adopting a three-phase motor as a blower, torque fluctuation can be made smaller than that of the conventional one, and vibration and noise of the blower can be reduced. Moreover, since the efficiency as a blower improves, it becomes possible to aim at reduction of power consumption. Furthermore, by eliminating the need for position detection elements, the number of parts can be reduced as a blower.

  In the invention of claim 2, by setting the outer diameter size of the control board for housing the drive circuit to 35 mm or less, the drive circuit of the three-phase motor can be housed in a small control board and incorporated in the blower, A compact structure can be realized.

  In the invention of claim 3, by arranging the drive circuit between the stator and the casing, the winding of the stator is connected to the drive circuit through the shortest path without increasing the size of the entire apparatus as much as possible. It becomes possible.

  According to the first aspect of the present invention, it is possible to provide a blower device that is low in vibration and noise, can achieve low power consumption, and can reduce the number of components.

  According to invention of Claim 2, the air blower which implement | achieved the compact structure can be provided.

  According to the third aspect of the present invention, it is possible to provide a blower that can connect the winding of the stator to the drive circuit through the shortest path without increasing the overall shape as much as possible.

It is a longitudinal cross-sectional view of the air blower which shows 1st Example of this invention. It is a top view of an air blower same as the above. It is a bottom view of an air blower same as the above. It is a circuit diagram regarding a motor and its drive circuit same as the above. It is a top view of a printed circuit board same as the above. It is a top view of the air blower which shows 2nd Example of this invention. It is a side view of an air blower same as the above. It is a longitudinal cross-sectional view of an air blower same as the above. It is a perspective view of a waterproof ring same as the above. It is a bottom view of a centrifugal fan same as the above.

  Hereinafter, preferred embodiments of a blower according to the present invention will be described with reference to the accompanying drawings. In the following embodiments, common portions are denoted by common reference numerals, and description of common portions is omitted as much as possible to avoid duplication.

  FIGS. 1-5 has shown the example which applied the air blower in 1st Example of this invention to thin electronic devices, such as a notebook personal computer. In each of these drawings, the fan motor 1 as a blower has a flat outer shape as a whole and is accommodated in a thin electronic device. In addition, the fan motor 1 includes a centrifugal fan 2 as an impeller and a motor 3 as a drive source for applying a rotational force to the centrifugal fan 2. The casing 5 that forms the outline of the fan motor 1 is composed of, for example, a bottomed base 6 made of a member having excellent thermal conductivity and a cover 7 that covers the upper opening of the base 6. In order to achieve this, the casing 5 itself may be formed as a part of the casing of the thin electronic device.

  The motor 3 includes a bottomed cylindrical sleeve 11 that is fixed upright to a base 6, a stator 13 that is provided on the outer peripheral portion of the sleeve 11 and has a stratified iron core around which a winding 12 is wound, and a stator 13. The rotor 14 is rotated by receiving the magnetic force of the motor, and is electrically connected to both ends of the winding 12, and various electronic components such as a control IC 15, a resistor 16 and a capacitor 17 are mounted on the motor together with these electronic components. And a printed circuit board 19 on which three drive circuits 18 are formed. Moreover, the motor 3 here employs an outer rotor type in which a rotor 14 is disposed on the outer periphery of the stator 13. A cylindrical bearing 21 is inserted into the sleeve 11, and a shaft 22 as a rotating shaft that is rotatably supported in the sleeve 11 by the bearing 21 is attached and fixed to the center of the rotor 14. . The printed circuit board 19 is connected to a wire 24 having a connector 23 connected to the tip thereof by soldering or the like in order to supply an operating voltage or the like from the outside of the fan motor 1 to the stator 13 or the drive circuit 18.

  The rotor 14 includes a yoke 27 disposed so as to surround the stator 13, and a permanent magnet 28 as a magnet provided on the inner peripheral surface of the yoke 27, and the centrifugal force is applied to the rotor 14 and the outer peripheral surface of the yoke 27. A fan 2 is provided. The centrifugal fan 2 is made of resin and has a fan cup 29 fitted to the yoke 27 and a plurality of blades 30 arranged radially on the outer peripheral surface of the fan cup 29 around the shaft 22. . In this embodiment, by applying a predetermined current to the winding 12 of the stator 13 via the printed circuit board 19, an attractive force and a repulsive force are generated between the rotor 14 and the permanent magnet 28 of the rotor 14 facing the stator 13. The centrifugal fan 2 rotates with the rotor 14 around the shaft 22.

  In the casing 5, intake ports 31 and 32 are formed as intake portions on both sides in the axial direction of the rotor 14, which is also the suction direction of the centrifugal fan 2. In the present embodiment, the air inlets 31 and 32 are provided in the base 6 and the cover 7 constituting the casing 5, respectively. However, for example, only one air inlet 31 may be provided. In addition, an exhaust port 33 as an exhaust portion is formed in the radial direction of the rotor 14, which is also the discharge direction of the centrifugal fan 2, perpendicular to the intake ports 31 and 32. The number of the exhaust ports 33 is not particularly limited.

  FIG. 4 shows the electrical configuration of the motor 3 and its drive circuit 18. The motor 3 in this embodiment is a fan motor 1 as a three-phase motor having three sets of drive coils 35A, 35B, and 35C formed by winding the windings 12 corresponding to the respective phases of U, V, and W. Built in. The drive coils 35A, 35B, 35C are star-connected, and one end of each drive coil 35A, 35B, 35C and the neutral point of the star-connect are connected to the motor control terminal of the control IC 15. Thereby, in each drive coil 35A, 35B, 35C, an electric current can be supplied to one direction and another direction.

  On the other hand, the motor 3 is a DC brushless motor without a so-called commutator. Instead, the control IC 15 has a semiconductor for switching the direction of the coil current flowing through the drive coils 35A, 35B, 35C at a predetermined timing. A switch (not shown) is incorporated. Further, in order to determine the switching timing of the coil current, it is necessary to detect the position (phase) of the rotor 14, but the drive circuit 18 of the present embodiment captures a change in the magnetic field from the rotating permanent magnet 28. For example, no position detection element such as a Hall element is provided. The position detection means of the rotor 14 is built in the control IC 15. For example, the position of the rotor 14 is monitored by monitoring changes in the induced voltages of the drive coils 35 </ b> A, 35 </ b> B, 35 </ b> C using the motor control terminal. Is detected, the built-in semiconductor switch is switched, and the coil currents to the drive coils 35A, 35B, and 35C are switched at an appropriate timing.

  In addition, elements for determining a time constant such as a resistor 16 and a capacitor 17 are connected to the control IC 15 together with the drive coils 35A, 35B, and 35C by a wiring pattern 37 formed on the printed circuit board 19. As shown in FIG. 5, the printed circuit board 19 is formed in a circular shape in plan view, and an insertion hole 38 of the sleeve 11 is provided at the center thereof. Further, the outer peripheral diameter φ of the printed circuit board 19 is 35 mm or less, and is formed substantially the same as the outer diameter of the fan cup 29 having a cup shape as a whole. The reason why the printed circuit board 19 can be miniaturized in this manner is that the drive circuit 18 is not provided with an independent position detection element.

  The drive circuit 18 is disposed between the stator 13 provided with the winding 12 and the base 6 forming the bottom surface of the casing 5 in a state of being mounted and accommodated on the printed circuit board 19. In this case, the drive circuit 18 is disposed immediately below the stator 13, a plated through hole 39 is formed in the printed circuit board 19, and the pin 40 connected to the end of the winding 12 is formed in the plated through hole 39. By inserting and embedding solder (not shown) therein, the winding 12 is connected to the drive circuit 18 through the shortest path. Further, the printed circuit board 19 can be accommodated in the casing 5 without enlarging the casing 5 forming the outer shape of the fan motor 1 as much as possible.

  In the fan motor 1, an operating voltage is applied to the drive circuit 18 through the wire 24, whereby the control IC 15 is activated, and a coil current is applied to the drive coils 35 A, 35 B, and 35 C of the motor 3 with a phase difference of 120 °. Supplied. The control IC 15 monitors the induced voltage of the drive coils 35A, 35B, and 35C generated by the electromagnetic action with the permanent magnet 28, thereby detecting the position of the rotor 14 and thereby detecting each of the drive coils 35A, 35B, and 35C. By switching the coil current to the rotor at an appropriate timing, a rotational driving force is applied from the stator 13 to the permanent magnet 29 attached to the rotor 14.

  At this time, air that has taken heat from a heat generating component (not shown) inside the thin electronic device is sucked from one side of the centrifugal fan 2 to the blade 30 from one side of the centrifugal fan 2, and the other intake Similar air is sucked into the blade 30 from the other side of the centrifugal fan 2 through the port 32. Between the blades 30, the air in the casing 5 is sent out from the inner peripheral side of the centrifugal fan 2 to the outer peripheral side, and from the exhaust port 33 of the casing 5 in the direction orthogonal to the intake ports 31 and 32, the outside of the thin electronic device. Exhausted.

  As described above, in this embodiment, the centrifugal fan 2 integrally formed with a plurality of blades 30 is attached to the outer periphery of the rotor 14 of the outer rotor type DC brushless motor 3, and the rotational axis direction of the centrifugal fan 2 is the same. In the fan motor 1 as a blower device having the intake ports 31 and 32 in the thrust direction and the exhaust port 33 in the radial direction that is the radial direction of the centrifugal fan 2, the motor 3 includes a three-phase drive coil 35 </ b> A, A drive circuit 18 that is a three-phase motor in which 35B and 35C are wound around an iron core and supplies a coil current as a drive current to the drive coils 35A, 35B, and 35C of the motor 3 is incorporated. Has a configuration in which the position detection means for the rotor 14 is built in the control IC 15 for controlling the motor 3 in order to eliminate the need for the position detection element of the rotor 14.

  In this case, by adopting a three-phase motor as the motor 3 of the fan motor 1, the torque fluctuation can be made smaller than that of the conventional one, and the vibration and noise of the fan motor 1 can be reduced. Further, since the efficiency as the fan motor 1 is improved, it is possible to reduce power consumption. Furthermore, the number of parts of the fan motor 1 can be reduced by eliminating the need for the position detection element. Therefore, it is possible to provide the fan motor 1 that has low vibration and noise, can achieve low power consumption, and can reduce the number of components.

  In the present embodiment, a printed circuit board 19 is provided as a control board for housing the drive circuit 18, and the printed circuit board 19 is formed so that the outer diameter size φ of the printed circuit board 19 is 35 mm or less.

  In this case, by setting the outer diameter size φ of the printed circuit board 19 that stores the drive circuit 18 to 35 mm or less, the drive circuit 18 of the three-phase motor can be stored in the small printed circuit board 19 and incorporated in the fan motor 1. And a compact structure can be realized.

  In particular, the drive circuit 18 of this embodiment is disposed between the stator 13 provided with the winding 12 and the casing 5 that houses the motor 3.

  In this case, by arranging the drive circuit between the stator 13 and the casing, the winding 12 of the stator 13 can be routed to the drive circuit 18 through the shortest path without enlarging the overall shape of the fan motor 1 as much as possible. It becomes possible to connect.

  FIGS. 6-10 has shown the fan motor 1 as an air blower in 2nd Example of this invention. The features of the present embodiment may be combined with those described in the first embodiment.

  In each of these drawings, the fan motor 1 includes a centrifugal fan 2 as an impeller and a motor 3 as a drive source for applying a rotational force to the centrifugal fan 2. The casing 5 that forms the outline of the fan motor 1 is composed of the bottomed base 6 and the cover 7 as described above.

  The motor 3 includes a bottomed cylindrical sleeve 11 that is fixed upright substantially at the center of the base 6, a stator 13 that is provided on the outer periphery of the sleeve 11 and has a stratified iron core around which a winding 12 is wound. A rotor 14 that rotates by receiving a magnetic force from the child 13 and a printed circuit board 19 that is electrically connected to both ends of the winding 12 and forms an electric circuit such as a drive circuit of the motor 3 are configured. . Moreover, the motor 3 here employs an outer rotor type in which a rotor 14 is disposed on the outer periphery of the stator 13. A cylindrical bearing 21 is inserted into the inside of the sleeve 11, and the bearing 21 is fixed substantially at the center of the casing 6, and a shaft as a rotating shaft that is rotatably supported in the sleeve 11 by the bearing 21. 22 is fixedly attached to the center of the rotor 14.

  The rotor 14 includes a yoke 27 disposed so as to surround the stator 13, and a permanent magnet 28 as a magnet provided on the inner peripheral surface of the yoke 27, and includes the centrifugal fan 2 on the outer peripheral surface of the yoke 27. Configured. The centrifugal fan 2 is made of resin, and includes a fan cup 29 as a boss fitted and attached to the yoke 27, a plurality of blades 50 and 51 that are arranged radially around the shaft 22, and the fan cup 29. And a connecting portion 52 connecting the blades 50 and 51. Here, the blades 50 and 51 have the same shape and both have an arc shape and are alternately arranged on the outer peripheral side of the fan cup 29. However, the blades 50 and 51 have the same shape as the blade 30 of the first embodiment. May be. Also in this embodiment, by applying a predetermined current to the winding 12 of the stator 13 via the printed circuit board 19, an attractive force and a repulsive force are generated between the permanent magnet 28 of the rotor 14 facing the stator 13. The centrifugal fan 2 rotates with the rotor 14 around the shaft 22.

  In the casing 5, intake ports 31 and 32 are formed as intake portions on both sides in the axial direction of the rotor 14, which is also the suction direction of the centrifugal fan 2. In the present embodiment, the air inlets 31 and 32 are provided in the base 6 and the cover 7 constituting the casing 5, respectively. However, for example, only one air inlet 31 may be provided. In addition, an exhaust port 33 as an exhaust portion is formed in the radial direction of the rotor 14, which is also the discharge direction of the centrifugal fan 2, perpendicular to the intake ports 31 and 32. The number of the exhaust ports 33 is not particularly limited.

  In the present embodiment, in order to protect the bearing 21 constituting the motor 3 and the printed circuit board 19 including the electric circuit from intruders such as water entering from the outside of the fan motor 1, the motor 3 is connected to the intake ports 31 and 32. A labyrinth-like labyrinth structure 55 that substantially surrounds the exhaust port 33 is formed. The labyrinth structure 55 includes a first protrusion 56 and a third protrusion 58 formed from the bottom surface of the base 6 toward the centrifugal fan 2, the fan cup 29 of the centrifugal fan 2, blades 50 and 51, The second ridge 57 and the fourth ridge 59 formed from the gap toward the base 6, and the waterproof ring 60 attached to the tip of the third ridge 58, and these The first protrusions 56 to the fourth protrusions 59 are alternately arranged in the circumferential direction so as not to hinder the rotation of the rotor 14. In addition, the 1st protrusion part 56-the 4th 59 which are cylindrical ribs are not limited to four like a present Example, Moreover, the waterproof ring 60 is 1st protrusion part. You may provide in the edge part of the 56th-4th protrusion part 59. FIG.

  The second protrusion 57 projects from the connecting part 52 of the centrifugal fan 2 toward the recess between the first protrusion 56 and the third protrusion 58 of the base 6, and is also a waterproof ring. The third ridge 58 to which 60 is attached is projected from the bottom surface of the base 6 toward the recess between the second ridge 57 and the fourth ridge 59 of the centrifugal fan 2. The fourth protrusion 59 of the centrifugal fan 2 also serves as a side surface of the fan cup 29, and a yoke 27 that holds the permanent magnet 28 is attached to the inner surface of the fourth protrusion 59. .

  The waterproof ring 60 is fixed to the third protrusion 58 by bonding or the like, for example, whereby the labyrinth structure 55 has a wide space between the second protrusion 57 and the third protrusion 58, and the first protrusion 58. Narrow spaces between the two protrusions 57 and the waterproof ring 60 are formed. The material of the waterproof ring 60 is made of, for example, a fluororesin having good water repellency, and the third protrusion 58 is made of a metal or resin such as aluminum having good hydrophilicity.

  Further, in order to prevent the labyrinth structure 55 from reaching the bearing 21, a fifth ridge 61, a sixth ridge 62, a seventh ridge 63, which are other cylindrical ribs, The eighth ridge 64, the ninth ridge 65, and the tenth ridge 66 are juxtaposed on the inner surface of the centrifugal fan 2 in the circumferential direction. The fifth protruding portion 61 to the ninth protruding portion 65 are all formed toward the stator 13, while the tenth protruding portion 66 is provided at the upper end of the sleeve 11 for inserting and fixing the bearing 21. Formed towards. The tenth protruding portion 66 protrudes higher (longer) than the fifth protruding portion 61 to the ninth protruding portion 65.

  The electric circuit including the printed circuit board 19 is appropriately waterproofed. Moreover, the number of the 5th protrusion part 61-the 10th protrusion part 66 is not limited to six like a present Example.

  In FIG. 8, an arrow W serving as a water intrusion path is shown. As the water jets into the fan motor 1 and the water is immersed, the water in the casing 5 moves between the centrifugal fan 2 and the case 6. From the inside of the labyrinth structure 55. At this time, since the waterproof ring 60 is provided at the tip of the third protrusion 58, the narrow space between the waterproof ring 60 and the second protrusion 57 prevents water from entering, Due to the water repellency of the waterproof ring 60 itself, the water that has reached the waterproof ring 60 is repelled, and water enters the region between the third ridge 58 and the fourth ridge 59 of the labyrinth structure 55. Can be prevented. Therefore, the water flows along a wide space between the second ridge 57 and the third ridge 58, and the first ridge 56 and the second ridge 57, which are open, It is discharged to the outside of the labyrinth structure 55 from the passage between them.

  Thus, a small amount of water enters the region composed of the first protrusions 56 to the fourth protrusions 59 of the labyrinth structure 55, but there is another water intrusion path from there to the bearing 21. Since there are the fifth protrusion 61 to the tenth protrusion 66, water can be prevented from entering the bearing 21. Even if water gets over the fifth ridge 61 to the ninth ridge 65, the tenth ridge 66 protruding higher can surely prevent the water from entering the bearing 21.

  Further, in JIS C 0920 and IEC 60529, the outline of the protection class by the outer shell of the electric machine is defined by the protection classes 1 to 8, respectively. However, the labyrinth structure 55 as in the present embodiment and the fifth protrusion are further described. By providing the strip 61 to the ninth projection 65, the protection class 5 (protecting against jets) and the protection class 7 (protecting so as not to be affected even when immersed in water) are defined. Under these conditions, it is possible to reliably prevent water from entering the bearing 21 and the electric circuit.

  By the way, in the conventional fan motor, a double-sided intake centrifugal fan that can be cooled efficiently is used. However, the intake part is arranged on both sides of the centrifugal fan, and the height of the centrifugal fan and the motor is reduced. Water is easy to enter because it is suppressed. When used in an environment where water is applied, the intruded water sometimes reaches the electric circuit and the bearing.

  In response to such problems, for example, Japanese Patent No. 3694224 discloses a centrifugal fan having a waterproof structure. However, the height direction of the centrifugal fan is increased and cannot be accommodated in the casing, and the waterproof property is insufficient.

  In this regard, in the present embodiment, in order to provide a fan motor 1 having a double-sided intake type having air inlets 31 and 32 facing both surfaces of the centrifugal fan 2 and having excellent waterproof properties, A labyrinth structure 55 composed of a plurality of protrusions 56 to 59 is formed between the blades 50 and 51, and a waterproof ring 60 is provided at the tip of the third protrusion 58, and the waterproof ring 60 is a third ring. It is made of a material having better water repellency than the protrusion 58.

  In this way, the waterproof ring 60 is provided from the outside of the fan motor 1 only by providing the waterproof ring 60 at the tip of the third protrusion 58 for forming the labyrinth structure 55, due to the water repellency of the waterproof ring 60 itself. Can effectively repel water that has reached Therefore, even though the double-sided intake fan motor 1 is used, sufficient waterproofness can be obtained even if the thickness of the entire centrifugal fan 2 is reduced.

  Preferably, in the present embodiment, by providing the waterproof ring 60, a wide portion and a narrow portion are formed in the gap of the labyrinth structure 55 to effectively prevent water from entering the narrow portion. In addition, when the material of the waterproof ring 60 is a fluororesin, water can be repelled more effectively, and further sufficient waterproofness can be obtained.

  In this embodiment, a labyrinth structure 55 including a plurality of protrusions 56 to 59 is formed between the yoke 27 and the blades 50 and 51, and a waterproof ring 60 is provided at the tip of the third protrusion 58. Thus, a wide part and a narrow part are formed in the gap of the labyrinth structure 55, the third protrusion 58 is made of a hydrophilic metal such as aluminum, and the material of the waterproof ring is made of resin.

  If it does in this way, the penetration | invasion of the water to the narrow part of the clearance gap of the labyrinth structure 55 as mentioned above can be prevented effectively, and also the waterproof ring 60 from the outside of the fan motor 1 by the water repellency of the waterproof ring 60 itself. Can be effectively repelled, and the repellent water can be easily released to the outside of the labyrinth structure 55 by the hydrophilicity of the third protrusion 58 itself.

  Furthermore, in this embodiment, in order to provide a fan motor 1 having a double-sided intake type that is provided with intake ports 31 and 32 opposite to both sides of the centrifugal fan 2 and is excellent in water resistance, a yoke 27 and a blade A labyrinth structure 55 including a plurality of protrusions 56 to 59 is formed between the yokes 27 and the shaft 22, and a plurality of cylindrical protrusions 61 to 66 are formed between the yokes 27 and the shaft 22. ing.

  If it does in this way, it will become possible to prevent intruders, such as water, with the 5th protrusion part 61-the 10th protrusion part 66 especially with respect to the bearing 21 which pivotally supports the shaft 22. FIG. Therefore, even though the double-sided intake fan motor 1 is used, sufficient waterproofness can be obtained even if the thickness of the entire centrifugal fan 2 is reduced.

  Further, the tenth ridge 66 located in the vicinity of the shaft 22 is formed so as to protrude higher than the other sixth ridge 61 to the ninth ridge 69, so that it enters the fan motor 1. Even if the water that has passed over the fifth ridge portion 61 to the ninth ridge portion 65, the tenth ridge portion 66 protruding higher can reliably prevent the water from entering the bearing 21.

  In addition, this invention is not limited to the said Example, A various change is possible in the range which does not deviate from the meaning of this invention.

1 Fan motor (blower)
3 Motor 5 Casing 12 Winding 13 Stator 18 Drive Circuit 19 Printed Circuit Board (Control Board)
31, 32 Inlet port 33 Exhaust port

Claims (3)

In the air blower having a centrifugal fan mounted on the outer periphery of the rotor of the DC brushless motor, having an intake port in the thrust direction of the centrifugal fan, and having an exhaust port in the radial direction of the centrifugal fan,
The DC brushless motor is a three-phase motor, and has a built-in drive circuit for the DC brushless motor.
The air blower characterized in that the drive circuit has a configuration in which a position detection element of the rotor is unnecessary.   The blower according to claim 1, further comprising a control board for housing the drive circuit, wherein an outer diameter size of the control board is 35 mm or less.   The blower according to claim 1 or 2, wherein the drive circuit is disposed between a stator having windings and a casing that houses the DC brushless motor.

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