JP2009089571A - Motor device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a motor device that prevents deterioration in cooling efficiency. <P>SOLUTION: A coolant flowing in from a coolant inlet 36 is discharged from a coolant outlet 38 through a coolant flow path 50. Here, the coolant flow path 50 includes a plurality of cooling passages 56 for separating a coolant flow. If a passage from the coolant inlet to the coolant outlet is composed of one passage in order to cool a prescribed area, a passage length becomes long. However, if the coolant flow is separated by the plurality of cooling passages 56 in order to cool the prescribed area, a distance from the coolant inlet 36 to the coolant outlet 38 becomes short and a coolant temperature difference between the coolant inlet 36 and the coolant outlet 38 can be reduced. Namely, it is possible to prevent deterioration in cooling efficiency by providing the coolant flow path 50 with the plurality of cooling passages 56 separating the coolant flow. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a motor device in which a fluid such as a refrigerant flows into a housing.

  Patent Document 1 describes a motor device that cools a motor main body by providing a coolant channel through which a coolant passes in a housing of a motor device and flowing the coolant through the coolant channel.

Specifically, the refrigerant flows into the refrigerant channel from the refrigerant inlet provided in the housing. The introduced refrigerant flows through the refrigerant flow path, absorbs the heat energy of the motor body, and is discharged from the refrigerant outlet provided in the housing. In this way, the motor body is cooled by flowing the refrigerant through the refrigerant flow path.
JP 2006-197785 A

  However, according to this motor device, the refrigerant flow path provided between the refrigerant inlet and the refrigerant outlet is constituted by a single passage as in one-stroke writing. For this reason, the length of the refrigerant flow path from the refrigerant inlet to the refrigerant outlet is increased, and the difference between the refrigerant temperature near the refrigerant inlet and the refrigerant temperature near the refrigerant outlet is increased, resulting in low cooling efficiency. .

  An object of the present invention is to suppress the decrease in cooling efficiency in consideration of the above facts.

  A motor device according to claim 1 of the present invention is formed on a radially outer side of a rotor, a stator in which a plurality of phases of windings are wound around a core iron core, a housing that houses the stator, and the housing. The refrigerant inlet provided on one end side in the axial direction of the stator, the refrigerant outlet formed on the housing and provided on the other end side in the axial direction of the stator, and formed on the housing, the refrigerant And a refrigerant flow path including a plurality of passages that communicate the inlet and the refrigerant outlet and divide the refrigerant flowing from the refrigerant inlet.

  According to the above configuration, power is supplied to each winding of the stator, a predetermined rotating magnetic field is generated, and the rotor rotates.

  On the other hand, the refrigerant flowing from the refrigerant inlet formed on the one end side of the housing passes through the refrigerant flow path and is discharged from the refrigerant outlet formed on the other end side of the housing.

  Here, a plurality of passages for diverting the refrigerant are provided in the refrigerant flow path through which the refrigerant passes. That is, if the passage from the refrigerant inlet to the refrigerant outlet is configured with one passage in order to cool the predetermined area, the passage length becomes long. However, when the predetermined area is cooled by diverting the refrigerant through the plurality of passages, the refrigerant inlet The distance from the refrigerant outlet to the refrigerant outlet becomes shorter, and the temperature difference between the refrigerant at the refrigerant inlet and the refrigerant outlet becomes smaller. That is, it is possible to suppress a decrease in cooling efficiency by providing a plurality of passages through which the refrigerant flow channel divides the refrigerant.

  A motor device according to a second aspect of the present invention is the motor device according to the first aspect, wherein the refrigerant flow path is provided on an inner peripheral surface of the housing, and one end portion thereof communicates with the refrigerant inlet and extends in the axial direction. An inflow passage that extends, communicates with the other end portion of the inflow passage, and has a first annular passage that is annularly provided so as to surround the stator, and one end portion communicates with the first annular passage, and the first annular passage And a plurality of cooling passages for diverting the refrigerant flowing into the passage and guiding the refrigerant toward the refrigerant outlet.

  According to the above configuration, the refrigerant flowing from the refrigerant inlet passes through the inflow passage extending in the axial direction and reaches the first annular passage provided in an annular shape so as to surround the stator. Further, the refrigerant that flows into the first annular passage and flows so as to surround the stator is divided by a plurality of cooling passages whose one end portion communicates with the first annular passage, and is discharged from the refrigerant outlet through the cooling passage. .

  In this way, the refrigerant can be divided by a plurality of cooling passages.

  According to a third aspect of the present invention, in the motor device according to the second aspect, the cooling passage extends in the axial direction.

  According to the above configuration, since the cooling passage for diverting the refrigerant extends in the axial direction, the length of the cooling passage can be shortened. Thereby, the temperature difference of the refrigerant | coolant in the entrance and exit of a cooling channel can be made small, and the fall of cooling efficiency can be suppressed.

  According to a fourth aspect of the present invention, in the motor device according to the second aspect, the cooling passage extends spirally.

  According to the above configuration, the cooling passage for diverting the refrigerant extends spirally. That is, since the stator can be cooled along the circumferential direction with one cooling passage, the number of cooling passages can be reduced as compared with the case where the cooling passage is provided in the axial direction.

  A motor device according to a fifth aspect of the present invention is the motor device according to the first aspect, wherein the refrigerant flow path is provided on an inner peripheral surface of the housing, and one end thereof communicates with the refrigerant inlet and extends in the axial direction. An inflow passage that extends, communicates with the other end of the inflow passage, and is provided on the opposite side of the inflow passage with the first annular passage provided in an annular shape so as to surround the stator, and across the first annular passage. A plurality of second annular passages annularly provided so as to surround the stator, a communication passage communicating the first annular passage, the second annular passage, and the adjacent second annular passage, and one end And a discharge passage that communicates with the second annular passage and guides the refrigerant flowing through the second annular passage toward the refrigerant outlet.

  According to the above configuration, the refrigerant flowing from the refrigerant inlet passes through the inflow passage extending in the axial direction and reaches the first annular passage provided in an annular shape so as to surround the stator. Further, the refrigerant flowing into the first annular passage and flowing so as to surround the stator reaches the second annular passage provided so as to surround the stator through the communication passage, and flows so as to surround the stator.

  The refrigerant that has flowed into the first second annular passage passes through the communication passage and reaches the next second annular passage. This is repeated, and the refrigerant flowing through the last second annular passage is discharged from the refrigerant outlet through the discharge passage.

  Thus, by providing a plurality of second annular passages so as to surround the stator, the stator can be uniformly cooled in the circumferential direction.

  A motor device according to a sixth aspect of the present invention is the motor device according to the first aspect, wherein the refrigerant flow path is provided on an inner peripheral surface of the housing, and one end portion thereof communicates with the refrigerant inlet and extends in the axial direction. An inflow passage that extends, one end of which communicates with the other end of the inflow passage, extends in a spiral toward one direction, and guides the refrigerant toward the refrigerant outlet, and one end of the inflow passage And a second spiral passage that communicates with the other end of the first passage, extends in a spiral shape toward the other direction, and guides the refrigerant toward the refrigerant outlet.

  According to the above configuration, the refrigerant flowing in from the refrigerant inlet passes through the inflow passage extending in the axial direction, the first spiral passage extending in a spiral shape in one direction, and the first extension extending in a spiral shape in the other direction. 2 leads to the spiral path. The refrigerant that has flowed into the first spiral passage flows spirally in one direction, and the refrigerant that has flowed into the second spiral passage flows spirally in the other direction, so that the refrigerant that has flowed in from the refrigerant inlet Is shunted.

  Further, the refrigerant flowing through the first spiral passage and the second spiral passage is discharged from the refrigerant outlet.

  As described above, the refrigerant is divided by the first spiral passage that spirally extends in one direction and the second spiral passage that spirally extends in the other direction, so that the stator flows in one direction and the other. It can be efficiently cooled by the refrigerant flowing in the direction of.

  A pump motor 10 as a motor device according to the first embodiment will be described with reference to FIGS. Note that an arrow UP appropriately shown in each figure indicates the upper side in the direction of gravity.

  As shown in FIG. 4, the pump motor 10 includes a stator 12, a rotor 14 disposed in an axial center portion of the stator 12, and a rotating shaft 16 fixed to the axial center portion of the rotor 14. 18 and a motor housing 20 that houses a portion of the motor mechanism 18 excluding a part of the rotating shaft 16.

  The stator 12 is fixed so as not to rotate relative to the motor housing 20, and the rotating shaft 16 is rotatably supported by the motor housing 20, that is, the stator 12 via a bearing 22. An impeller (not shown) is attached to the tip of the rotating shaft 16 so as to rotate integrally, and constitutes a pump that applies driving force to the fluid.

  As shown in FIG. 2, the rotor 14 is configured by fixing a plurality (even number) of magnets 40 having different polarities alternately in the circumferential direction to the rotating shaft 16. As shown in FIG. 4, the stator 12 is configured by winding a winding around a core iron core 24 to form a multiphase coil 26.

  Specifically, as shown in FIG. 2, the stator 12 is a three-phase brushless motor. U-phase, V-phase, and W-phase coils 26 </ b> U are inserted into a predetermined number of slots 24 </ b> A of the core core 24. , 26V, 26W are arranged in a predetermined pattern in the circumferential direction. Thereby, the stator 12 is electrically configured as shown in FIG.

  As shown in FIGS. 2 and 3, the terminal portions 28U, 28V, 28W of the windings of the coils 26U, 26V, 26W of the respective phases and the common terminal portions 28COM of the respective phases are the core iron cores in the corresponding coils 26, respectively. At the radially outer end portions of 24, the core iron cores 24 are arranged at equal intervals in the circumferential direction. In FIG. 2, for convenience, the terminal portions 28U, 28V, 28W and the common terminal portion 28COM of each phase are illustrated on the radially outer side of the core iron core 24.

  As shown in FIG. 4, the motor housing 20 is formed in a bottomed cylindrical shape having a cylindrical portion 30 and a bottom portion 32 and is disposed so as to open upward in the gravitational direction. Therefore, in this embodiment, the axial directions of the stator 12, the rotor 14, and the rotating shaft 16 coincide with the direction of gravity.

  Further, the bearing 22 for rotatably supporting the rotary shaft 16, that is, the rotor 14 with respect to the motor housing 20 is disposed on a boss portion 32 </ b> A projecting from the shaft center portion of the bottom portion 32.

  Therefore, the stator 12, the rotor 14, and the rotating shaft 16 are coaxially arranged in the motor housing 20. Further, a space around the boss portion 32 </ b> A in the motor housing 20 is a lubricating oil tank 34. Furthermore, a pump portion (not shown) is connected to the upward opening 20A of the motor housing 20.

  The motor housing 20 has a refrigerant inlet 36 for flowing a refrigerant as a fluid (in this embodiment, a refrigerant containing lubricating oil in a mixture of gas and liquid), and a refrigerant outlet 38 for flowing the refrigerant. And are provided. The refrigerant inlet 36 opens to the bottom 32 of the motor housing 20 on one end side in the axial direction, and allows the refrigerant to flow in from the axial direction.

  The refrigerant outlet 38 is a side surface 42 of the motor housing 20 on the other end side (opening 20A side) in the axial direction, and opens on the opposite side to the refrigerant inlet 36 with respect to the axis CL shown in FIG. The refrigerant flows out from a direction orthogonal to the axial direction. The refrigerant flow path 50 through which the refrigerant flowing from the refrigerant inlet 36 flows until reaching the refrigerant outlet 38 will be described later.

  Further, the pump motor 10 includes a terminal holder (not shown) for supplying power to the stator 12 in the motor housing 20, that is, the coil 26 of each phase (connected to an external power supply circuit).

  The terminal holder includes a connection part electrically connected to the terminal part 28U of the U-phase coil 26U, a connection part electrically connected to the terminal part 28V of the V-phase coil 26V, and a terminal part of the coil 26W. A connection part electrically connected to 28W and a connection part electrically connected to the common terminal part 28COM of each phase are provided.

  As described above, in the pump motor 10, a rectangular wave or the like whose phase is shifted by 120 ° is input to the coils 26 </ b> U, 26 </ b> V, 26 </ b> W through the terminal holder connection portion according to the angular position of the magnet 15 constituting the rotor 14. Thus, a required rotating magnetic field is generated in the stator 12, and the rotor 14 is driven to rotate together with the rotating shaft 16.

  Next, the refrigerant flow path 50 will be described with reference to FIGS.

  As shown in FIG. 2, the stator 12 is provided with a cylindrical tube portion 44 that is in contact with the inner peripheral surface 20 </ b> B of the motor housing 20. The coolant channel 50 is formed between the cylindrical portion 44 and the motor housing 20 by processing the inner peripheral surface 20B of the motor housing 20 into a concave shape.

  As shown in FIGS. 1B, 1C, and 1D, the refrigerant inlet 36 constitutes a refrigerant flow path 50 and communicates with one end of an inflow passage 52 extending in the axial direction. ing. Further, the other end portion of the inflow passage 52 is provided with a first annular passage 54 that is annularly provided so as to surround the cylindrical portion 44 of the stator 12, and the refrigerant that has passed through the inflow passage 52 passes through the first annular passage 54. To flow into. Here, the first annular passage 54 is disposed to be above the lower end of the stator 12.

  Furthermore, one end of a cooling passage 56 that diverts the refrigerant that has flowed into the first annular passage 54 is communicated with the first annular passage 54, and the cooling passage 56 extends in the axial direction. The number of the cooling passages 56 is the same as the number of slots 24A of the stator 12 and is provided at equal intervals in the circumferential direction. Further, the cooling passage 56 is arranged with the shrink fit position removed.

  Furthermore, the other end portion of the cooling passage 56 is provided with a pool portion 58 provided on the upper side of the stator 12 and surrounded by the side surface 42 of the motor housing 20. The refrigerant is discharged from the refrigerant outlet 38 through 58.

  1B, FIG. 1C, and FIG. 1D mainly show the refrigerant flow path 50 formed on the inner peripheral surface of the motor housing 20 in order to facilitate understanding of the refrigerant flow path 50. It is described.

  Next, the operation of the embodiment will be described.

  As shown in FIGS. 2 and 4, in the pump motor 10 configured as described above, when power is supplied to the multiphase coils 26 </ b> U, 26 </ b> V, 26 </ b> W through the terminal holder connection portion, the rotor 14 and the rotary shaft 16 are combined. Rotating drive.

  Furthermore, the impeller connected to the rotating shaft 16 gives a driving force to the refrigerant. With this driving force, the refrigerant flows through the refrigerant flow path 50 (see FIG. 1) and is used for waste heat recovery.

  Specifically, as shown in FIG. 1, the refrigerant that has flowed from the refrigerant inlet 36 provided in the bottom 32 of the motor housing 20 passes through the inflow passage 52 extending in the axial direction and surrounds the stator 12 (see FIG. 4). Thus, the first annular passage 54 provided in an annular shape is reached. Further, the refrigerant that flows into the first annular passage 54 and flows so as to surround the stator 12 is branched by a plurality of cooling passages 56 having one end communicating with the first annular passage 54 and extending in the axial direction. In addition, the refrigerant that has flowed through the respective cooling passages 56 is discharged from the refrigerant outlet 38 through the pool portion 58 provided above the stator 12.

  As described above, the refrigerant flow path 50 is provided with a plurality of cooling passages 56 for diverting the refrigerant. If the passage from the refrigerant inlet to the refrigerant outlet is composed of a single passage in order to cool the predetermined area, the passage length becomes long.However, when the predetermined area is cooled by diverting the refrigerant through the plurality of cooling passages 56, The distance from the refrigerant inlet 36 to the refrigerant outlet 38 is shortened, and the temperature difference between the refrigerant at the refrigerant inlet 36 and the refrigerant outlet 38 can be reduced. That is, the refrigerant flow path 50 is provided with a plurality of cooling passages 56 for diverting the refrigerant, whereby a decrease in cooling efficiency can be suppressed.

  Further, by suppressing the resistance of the cooling effect, an increase in the winding resistance value can be suppressed, and further, by increasing the winding resistance value, the efficiency of the pump motor 10 can be improved. Can do.

  Further, a coolant channel 50 is formed on the inner peripheral surface of the motor housing 20 outside the cylindrical portion 44 of the stator 12, and further, the first annular passage 54 and the lower end portions of the cooling passage 56 (FIG. 1B). ) Is disposed above the lower end surface of the stator 12, so that dirt (for example, wear powder) contained in the refrigerant can be prevented from damaging the film of the winding, and the pump motor 10 reliability can be improved.

  Further, by arranging the same number of cooling passages 56 in the circumferential direction at equal intervals with respect to the number of slots 24A of the stator 12, the stator 12 can be uniformly cooled.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It is clear to the contractor. For example, in the above embodiment, the number of cooling passages 56 is the same as the number of slots 24A of the stator 12 and the stator 12 is uniformly cooled. Instead, the number of cooling passages is set to an integral multiple of the slots. Also good.

  Next, a pump motor 60 according to a second embodiment of the present invention will be described with reference to FIGS.

  In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 5 and 6, in this embodiment, as in the first embodiment, the cooling passage 62 does not extend in the axial direction. Instead, the cooling passage 62 extends in a spiral shape. ing.

  Further, the number of the cooling passages 62 is halved with respect to the number of the slots 24 </ b> A of the stator 12, and the two slots 24 </ b> A are cooled by the single cooling passage 56.

  Thus, by providing the cooling passage 62 in a spiral shape, the number of cooling passages can be reduced as compared with the case where the cooling passage is provided in the axial direction.

  Next, a pump motor 70 according to a third embodiment of the present invention will be described with reference to FIGS.

  In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 7 and 8, in this embodiment, unlike the first embodiment, on the opposite side of the inflow passage 52 across the first annular passage 54, there are a plurality of (this book) surrounding the stator 12. In the embodiment, three second annular passages 72 are provided in an annular shape.

  Furthermore, a communication passage 74 that allows the first annular passage 54 and the second annular passage 72 to communicate with each other is formed to extend in the axial direction so as to face the inflow passage 52. Further, a communication passage 76 that communicates with each second annular passage 72 and a discharge passage 78 that communicates between the second annular passage 72 provided above and the pool portion 58 are provided extending in the axial direction. 76 and the discharge passage 78 are arranged in a staggered manner as viewed from the side (direction shown in FIG. 7B).

  Further, the communication passage 78 communicating with the pool portion 58 is disposed at a position facing the refrigerant outlet 38 with respect to the central axis of the pump motor 70.

  Thus, by providing the plurality of second annular passages 72 so as to surround the stator 12, the stator 12 can be cooled evenly in the circumferential direction.

  Further, since the communication passage 74, the communication passages 74 and 76, and the discharge passage 78 are arranged in a staggered manner, the refrigerant can flow without being retained in the passages of the first annular passage 54 and the second annular passage 72. it can.

  Further, by providing the discharge passage 78 so as to face the refrigerant outlet 38, the inner wall of the motor housing 20 can be used as a separation plate, so that the oil is easily separated.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It is clear to the contractor. For example, in the above embodiment, a plurality of the second annular passages 72 are provided, but one may be used.

  Next, a pump motor 80 according to a fourth embodiment of the present invention will be described with reference to FIGS.

  In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 9 and 10, in this embodiment, unlike the first embodiment, the other end of the inflow passage 52 (the end opposite to the refrigerant inlet 36) is in one direction. A first spiral passage 82 that spirally extends toward the pool portion 58, and spirally extends in another direction opposite to the direction in which the first spiral passage 82 extends, A second spiral passage 84 that guides toward the pool portion 58 is provided.

  Further, the outlets of the first spiral passage 82 and the second spiral passage 84 to the pool portion 58 are provided at positions facing the refrigerant outlet 38 with respect to the central axis of the pump motor 80.

  In this way, the refrigerant is divided by the first spiral passage 82 that spirally extends in one direction and the second spiral passage 84 that extends in the other direction, so that the stator 12 flows in one direction and the other. It can be efficiently cooled by the refrigerant flowing in the direction of.

  In addition, pressure loss can be reduced and a high cooling effect can be obtained as compared with a structure in which three or more passages for dividing the refrigerant are provided.

(A) (B) (C) (D) It is the top view and side view which showed the refrigerant | coolant flow path etc. of the pump motor which concerns on 1st Embodiment of this invention. It is a top view which shows typically the stator which comprises the pump motor which concerns on 1st Embodiment of this invention. It is a circuit diagram of the stator which comprises the pump motor which concerns on 1st Embodiment of this invention. 1 is a side sectional view showing a schematic overall configuration of a pump motor according to a first embodiment of the present invention. (A) (B) (C) (D) It is the top view and side view which showed the refrigerant | coolant flow path etc. of the pump motor which concerns on 2nd Embodiment of this invention. It is a top view which shows typically the stator which comprises the pump motor which concerns on 2nd Embodiment of this invention. (A) (B) (C) (D) It is the top view and side view which showed the refrigerant | coolant flow path etc. of the pump motor which concerns on 3rd Embodiment of this invention. It is a top view which shows typically the stator which comprises the pump motor which concerns on 3rd Embodiment of this invention. (A) (B) (C) (D) It is the top view and side view which showed the refrigerant | coolant flow path etc. of the pump motor which concerns on 4th Embodiment of this invention. It is a top view which shows typically the stator which comprises the pump motor which concerns on 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Pump motor (motor apparatus) 12, ... Stator, 14 ... Rotor, 20 ... Motor housing (housing), 24 ... Core iron core, 36 ... Refrigerant inlet, 38... Refrigerant outlet, 50... Refrigerant flow path, 52... Inlet passage, 54. -Pump motor (motor device), 62 ... Cooling passage, 70 ... Pump motor (motor device), 72 ... Second annular passage, 74 ... Communication passage, 76 ...・ Communication passage, 78... Discharge passage, 80... Pump motor (motor device), 82.

Claims (6)

A stator that is arranged on the outer side in the radial direction of the rotor and in which a plurality of windings are wound around a core iron core;
A housing for housing the stator;
A refrigerant inlet formed on one end side in the axial direction of the stator, formed in the housing;
A refrigerant outlet formed in the housing and provided on the other end side in the axial direction of the stator;
A refrigerant flow path that is formed in the housing and includes a plurality of passages that communicate the refrigerant inlet and the refrigerant outlet and divide the refrigerant that flows from the refrigerant inlet;
A motor device comprising: The refrigerant flow path is provided on the inner peripheral surface of the housing,
One end portion communicates with the refrigerant inlet and an inflow passage extending in the axial direction;
A first annular passage that communicates with the other end of the inflow passage and is annularly provided so as to surround the stator;
One end portion communicates with the first annular passage, and a plurality of cooling passages for diverting the refrigerant flowing into the first annular passage and guiding the refrigerant toward the refrigerant outlet;
The motor device according to claim 1, comprising:   The motor device according to claim 2, wherein the cooling passage extends in the axial direction.   The motor device according to claim 2, wherein the cooling passage extends in a spiral shape. The refrigerant flow path is provided on the inner peripheral surface of the housing,
One end portion communicates with the refrigerant inlet and an inflow passage extending in the axial direction;
A first annular passage that communicates with the other end of the inflow passage and is annularly provided so as to surround the stator;
A plurality of second annular passages provided on the opposite side of the inflow passage across the first annular passage, and provided annularly so as to surround the stator;
A communication passage for communicating the first annular passage with the second annular passage, and the adjacent second annular passage;
A discharge passage that has one end communicating with the second annular passage and guides the refrigerant flowing through the second annular passage toward the refrigerant outlet;
The motor device according to claim 1, comprising: The refrigerant flow path is provided on the inner peripheral surface of the housing,
One end portion communicates with the refrigerant inlet and an inflow passage extending in the axial direction;
A first spiral passage having one end portion communicated with the other end portion of the inflow passage and extending spirally in one direction to guide the refrigerant toward the refrigerant outlet;
A second spiral passage, one end of which communicates with the other end of the first passage, extends in a spiral toward the other direction, and guides the refrigerant toward the refrigerant outlet;
The motor device according to claim 1, further comprising:

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