JP2013215056A - Stator cooling structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator cooling structure capable of ensuring a large flow passage area by providing a cooling passageway between a stator core tightly fastened in the axial direction and a holding cylinder or a pressing member.SOLUTION: A stator cooling structure includes: cylindrical stator cores 30 to 32; holding cylinders 20 to 23 each of which has a cylindrical body with a bottom surface at one end in the axial direction, and into which the stator cores 30 to 32 are inserted so that the end surfaces of one sides of the stator cores 30 to 32 in the axial direction are in contact with the inner surfaces of the bottom surfaces; pressing members 10 to 13 being in contact with the end surfaces of the other sides of the stator cores 30 to 32 in the axial direction and fixed to a housing 1 along with the holding cylinders 20 to 23, for tightly fastening the stator cores 30 to 32 in the axial direction; and cooling passageways 40 to 44 formed between the holding cylinders 20, 22, and 23, or an inner peripheral surface of the pressing member 11, and the outer peripheral surfaces of the stator cores 30 to 32.

Description

  The present invention relates to a cooling structure for a stator for a rotating electrical machine in which a stator core is axially clamped and fixed.

  The stator coil of the rotating electrical machine generates heat due to copper loss based on energization during rotation driving, and the stator core that winds the coil also generates heat due to iron loss. As a means for cooling the generated stator core, for example, there is a technique disclosed in Patent Document 1.

  The technology of Patent Document 1 includes, as cooling means, a core holder that contacts and holds the outer peripheral surface of the stator core on the inner peripheral surface, a refrigerant flow path that is provided on the inner peripheral surface of the core holder and distributes the refrigerant to the outer peripheral surface of the stator core, The outer peripheral surface communicates with the inner peripheral surface, and has a plurality of through holes for introducing the refrigerant into the outer peripheral surface of the stator core.

JP 2011-36024 A

  However, according to the technique disclosed in Patent Document 1, since the core holder must have sufficient strength to securely clamp the stator core, the cross-sectional area needs to be greater than a predetermined value. Therefore, the cross-sectional area of the refrigerant flow path formed on the inner peripheral surface of the core holder is limited to be small. As a result, the contact area between the refrigerant and the stator core is reduced, the cooling capacity is reduced, and the output of the rotating electrical machine is limited due to insufficient cooling capacity in an operating state where heat generation is large, such as at maximum output.

  The present invention has been made in view of the above-described problems, and a stator that can secure a large flow path area by providing a cooling passage between a stator core that is pressed and fixed in the axial direction and a holding cylinder or a pressing member. An object of the present invention is to provide a cooling structure.

  The invention according to claim 1, which has been made to achieve the above object, has a cylindrical stator core (30-32) and a cylindrical shape having a bottom surface at one end in the axial direction, and the stator core ( 30 to 32) the holding cylinder (20 to 23) into which the stator core (30 to 32) is inserted so that the one end face in the axial direction abuts, and the other end face in the axial direction of the stator core (30 to 32). A holding member (10-13) that is fastened to the housing (1) together with the holding cylinder (20-23) and presses the stator core (30-32) in the axial direction, and the holding cylinder (20, 22, 23) or a cooling passage (40 to 44) formed between the inner peripheral surface of the pressing member (11) and the outer peripheral surface of the stator core (30 to 32).

  According to this configuration, the stator cores (30 to 32) are clamped and pressed in the axial direction, and the inner peripheral surface of the holding cylinder (20, 22, 23) or the pressing member (11) and the stator cores (30 to 32). Cooling passages (40 to 44) are formed between the outer peripheral surfaces of the two. Therefore, a cooling passage having a wide contact area is formed on the outer peripheral surface of the stator core (30 to 32), and a large flow passage area of the refrigerant is ensured, so that the stator core (30 to 32) is cooled extremely effectively. There is an excellent effect.

It is a front view which shows 1st Embodiment of the stator cooling structure of this invention. It is II-II sectional drawing in FIG. 1 is an exploded perspective view showing a stator cooling structure according to a first embodiment of the present invention. It is a front view which shows 2nd Embodiment of the stator cooling structure of this invention. FIG. 5 is a VV cross-sectional view in FIG. 4. It is a perspective view which decomposes | disassembles and shows the stator cooling structure by 2nd Embodiment of this invention. It is a front view which shows 3rd Embodiment of the stator cooling structure of this invention. It is VIII-VIII sectional drawing in FIG. It is a perspective view which decomposes | disassembles and shows the stator cooling structure by 3rd Embodiment of this invention. It is a front view which shows 4th Embodiment of the stator cooling structure of this invention. It is XI-XI sectional drawing in FIG. It is a perspective view which decomposes | disassembles and shows the stator cooling structure by 4th Embodiment of this invention. It is a front view which shows 5th Embodiment of the stator cooling structure of this invention. It is XIV-XIV sectional drawing in FIG. It is a perspective view which decomposes | disassembles and shows the stator cooling structure by 5th Embodiment of this invention. It is XVI-XVI sectional drawing of FIG. FIG. 16 is a perspective view of the split core 33 in FIGS. 13, 14, and 15. It is the elements on larger scale which show the 1st deformation | transformation aspect of the A section (groove) in FIG. It is the elements on larger scale which show the 2nd deformation | transformation aspect of the A section (groove) in FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. However, parts corresponding to each other in all the drawings in this specification are denoted by the same reference numerals, and description of the overlapping parts will be omitted as appropriate.

  The stator of the rotating electrical machine of this embodiment is formed by winding a coil (not shown) in slots 6 of stator cores 30 to 32 made of an electromagnetic steel plate or a dust core. Cylindrical stator cores 30 to 32 are inserted into holding cylinders 20 to 23, and one end face thereof is in contact with the inner surface of the bottom surface of holding cylinders 20 to 23. The other end surfaces of the stator cores 30 to 32 abut against pressing members 10 to 13 that cover the holding cylinders 20 to 23 that accommodate the stator cores 30 to 32.

  The holding cylinders 20 to 23 and the pressing members 10 to 13 are in the housing 1 in a state in which the respective mounting holes 5 are continuously formed (described only in FIG. 2 and omitted in FIGS. 5, 8, 11, and 14). Are fastened by bolts 7. At this time, the axial dimension of the stator cores 30 to 32 and the depth of the holding cylinders 20 to 23 are set so that a slight gap is generated between the flange 4 of the holding cylinders 20 to 23 and the flange 4 of the holding members 10 to 13. Since the dimension is set, the axial pressing force is applied to the stator cores 30 to 32 by the tightening force of the bolt 7. Thereby, the stator cores 30 to 32 are fixed to the housing 1.

  The housing 1 supports a columnar rotor (not shown) that rotates close to the inner wall of the center hole of the stator cores 30 to 32 on the center axis of the stator cores 30 to 32. The housing 1 also includes a refrigerant passage that is liquid-tightly connected to the inlet 8 and the outlet 9 of the cooling passages 40 to 44.

  Next, a first embodiment will be described with reference to FIGS.

  The holding cylinder 20 is a cylindrical body having an opening 24 at the bottom, which is one end thereof, and a plurality of flanges 4 in which mounting holes 5 are drilled at the other end. In the cylindrical portion of the holding cylinder 20, an inlet 8 and an outlet 9, which are long holes in the axial direction, are provided by being drilled at diameter positions of the cylindrical portion. The inner peripheral surface of the cylindrical portion of the holding cylinder 20 from the end position on the opening 24 side of the inlet 8 and the outlet 9 to the flange 4 is a stepped portion 50 having an enlarged diameter.

  Since the diameter of the stator core 30 is set so that the stator core 30 can be inserted into the inner peripheral portion excluding the step portion 50 of the holding cylinder 20, the end surface of the stator core 30 can come into contact with the bottom surface of the holding cylinder 20.

  The holding member 10 includes an annular plate having an inner diameter that is intermediate between the diameter of the stator core 30 and the valley diameter of the slot 6 and an outer diameter that is substantially equal to the diameter of the holding cylinder 20. On the outer periphery of the annular plate of the pressing member 10, a plurality of flanges 4 project in the radial direction. A mounting hole 5 is drilled in the flange 4 so as to be continuous with the mounting hole 5 of the holding cylinder 20. In the annular plate of the holding member 10, the cylindrical portion 2 having an inner diameter slightly larger than the outer diameter of the stator core 30 and an outer diameter slightly smaller than the inner diameter of the stepped portion 50 of the holding cylinder 20 is concentric with the annular plate. Is erected. When the cylindrical portion 2 is fitted between the step portion 50 and the stator core 30, the height of the cylindrical portion 2 is set so that the tip of the cylindrical portion 2 is positioned on the longitudinal end surfaces of the inlet 8 and the outlet 9. Has been.

  When the holding cylinder 20, the stator core 30, and the pressing member 10 are assembled as shown in FIG. 2, there is an annular shape between the step portion 50 that is the inner peripheral surface of the holding cylinder 20 and the outer peripheral surface of the stator core 30. A cooling passage 40 is formed. The width of the cooling passage 40 is divided into dimensions in the longitudinal direction of the inlet 8 and the outlet 9 by the step portion 50 and the cylindrical portion 2. Refrigerant flows in from the inlet 8 and diverts to the half-circular cooling passage 40, and merges and flows out at the outlet 9. According to this configuration, since the pressing member 10 includes the cylindrical portion 2, the rigidity is improved, whereby the pressing force of the stator core 30 can be increased, and the stator core 30 can be firmly fixed.

  Next, a second embodiment will be described based on FIG. 4, FIG. 5 and FIG.

  The holding cylinder 21 is a cylindrical body having an opening 24 at a bottom portion, which is one end thereof, and a plurality of flanges 4 in which attachment holes 5 are drilled at the other end. The cylindrical portion of the holding cylinder 21 is provided with an inlet 8 and an outlet 9, which are long holes in the axial direction, drilled in diameter positions of the cylindrical portion.

  The holding member 11 includes an annular plate having an inner diameter that is intermediate between the diameter of the stator core 30 and the valley diameter of the slot 6 and an outer diameter that is substantially equal to the diameter of the holding cylinder 21. On the outer periphery of the annular plate of the pressing member 11, a plurality of flanges 4 project in the radial direction. A mounting hole 5 is drilled in the flange 4 so as to be continuous with the mounting hole 5 of the holding cylinder 21. A cylindrical portion 3 having an inner diameter slightly larger than the outer diameter of the stator core 30 and an outer diameter slightly smaller than the inner diameter of the holding cylinder 21 is erected on the annular plate of the holding member 11 concentrically with the annular plate. ing. In the cylindrical portion 3, an inlet 8 and an outlet 9, which are long holes in the axial direction, are provided by being drilled at the diameter position of the cylindrical portion 3 so as to be continuous with the inlet 8 and the outlet 9 of the holding cylinder 21. On the inner peripheral surface of the cylindrical portion 3, a groove portion 51 having the same width as the longitudinal direction of the inlet 8 and the outlet 9 is formed in an enlarged diameter. When the cylindrical part 3 is inserted into the holding cylinder 21 and the flanges 4 of the cylindrical part 3 and the holding cylinder 21 are brought into contact with each other, the cylindrical part 3 is arranged so that the tip of the cylindrical part 3 does not contact the bottom surface of the holding cylinder 21. The height of is set.

  The stator core 30 has a diameter dimension that can be inserted into the cylindrical portion 3 of the pressing member 11. The holding member 11 in which the stator core 30 is accommodated in the cylindrical portion 3 is inserted into the holding cylinder 21 so that the end surface of the stator core 30 can come into contact with the bottom surface of the holding cylinder 21.

  When the holding cylinder 21, the stator core 30, and the pressing member 11 are assembled as shown in FIG. 5, an annular cooling is provided between the groove portion 51 that is the inner peripheral surface of the pressing member 11 and the outer peripheral surface of the stator core 30. A passage 41 is formed. The width of the cooling passage 41 is partitioned by the groove 51 into the longitudinal dimensions of the inlet 8 and the outlet 9. The refrigerant flows in from the inlet 8, splits into the half-circular cooling passage 41, joins at the outlet 9, and flows out. According to this configuration, since the pressing member 11 includes the large cylindrical portion 3, the rigidity is further improved, whereby the pressing force of the stator core 30 can be further increased, and the stator core 30 can be fixed more firmly. be able to.

  Next, a third embodiment will be described based on FIG. 7, FIG. 8, and FIG.

  The holding cylinder 22 is a tubular body having an opening 24 at a bottom portion which is one end thereof and a plurality of flanges 4 in which mounting holes 5 are drilled at the other end. In the cylindrical portion of the holding cylinder 22, an inlet 8 and an outlet 9, which are long holes in the axial direction, are provided by being drilled at the diameter position of the cylindrical portion. On the inner peripheral surface of the cylindrical portion of the holding cylinder 22, an enlarged groove portion 52 having the same width dimension as the longitudinal dimension of the inlet 8 and the outlet 9 is formed.

  The diameter of the stator core 30 is set so that the stator core 30 can be inserted into the inner peripheral portion excluding the groove portion 52 of the holding cylinder 22, so that the end surface of the stator core 30 can come into contact with the bottom surface of the holding cylinder 22.

  The holding member 12 includes an annular plate having an inner diameter that is intermediate between the diameter of the stator core 30 and the slot 6 valley diameter, and an outer diameter that is substantially equal to the diameter of the holding cylinder 22. On the outer periphery of the annular plate of the pressing member 12, a plurality of flanges 4 project in the radial direction. A mounting hole 5 is drilled in the flange 4 so as to be continuous with the mounting hole 5 of the holding cylinder 22.

  When the holding cylinder 22, the stator core 30, and the pressing member 12 are assembled as shown in FIG. 8, an annular cooling is provided between the groove portion 52 that is the inner peripheral surface of the holding cylinder 22 and the outer peripheral surface of the stator core 30. A passage 42 is formed. The width of the cooling passage 42 is partitioned by the groove 52 into the dimensions of the inlet 8 and the outlet 9 in the longitudinal direction. The refrigerant flows in from the inlet 8, splits into the half-circumferential cooling passage 42, joins at the outlet 9, and flows out. According to this configuration, since the pressing member 12 does not include a cylindrical portion, a stator cooling structure can be obtained at a low cost.

  Next, 4th Embodiment is described based on FIG.10, FIG11 and FIG.12.

  The holding cylinder 21 is a cylindrical body having an opening 24 at a bottom portion, which is one end thereof, and a plurality of flanges 4 in which attachment holes 5 are drilled at the other end. The cylindrical portion of the holding cylinder 21 is provided with an inlet 8 and an outlet 9, which are long holes in the axial direction, drilled in diameter positions of the cylindrical portion.

  Since the stator core 31 has a diameter that can be inserted into the inner peripheral portion of the holding cylinder 21, the end surface of the stator core 31 can come into contact with the bottom surface of the holding cylinder 21. A groove 53 formed by reducing the outer diameter of the stator core 31 is provided on the outer peripheral surface of the stator core 31. The width dimension of the groove 53 is the same as the longitudinal dimension of the inlet 8 and outlet 9 of the holding cylinder 21. When the stator core 31 is inserted into the holding cylinder 21 and the end face of the stator core 31 abuts against the bottom surface of the holding cylinder 21, the axial positions of the inlet 8 and the outlet 9 and the groove 53 are communicated with each other in their full width. Is set.

  The holding member 12 includes an annular plate having an inner diameter that is intermediate between the diameter of the stator core 31 and the slot 6 valley diameter, and an outer diameter that is substantially equal to the diameter of the holding cylinder 21. On the outer periphery of the annular plate of the pressing member 12, a plurality of flanges 4 project in the radial direction. A mounting hole 5 is drilled in the flange 4 so as to be continuous with the mounting hole 5 of the holding cylinder 21.

  When such a holding cylinder 21, the stator core 31, and the pressing member 12 are assembled as shown in FIG. 11, an annular cooling is provided between the inner peripheral surface of the holding cylinder 21 and the groove portion 53 that is the outer peripheral surface of the stator core 31. A passage 43 is formed. The width of the cooling passage 43 is partitioned by the groove 53 into the longitudinal dimensions of the inlet 8 and the outlet 9. The refrigerant flows in from the inlet 8, splits into the half-circumferential cooling passage 43, joins at the outlet 9, and flows out. According to this configuration, since the pressing member 12 does not include a cylindrical portion, a stator cooling structure can be obtained at a low cost.

  Next, 5th Embodiment is described based on FIG.13, FIG14 and FIG.15.

  The holding cylinder 23 is a cylindrical body having an opening 24 at a bottom portion, which is one end thereof, and a plurality of flanges 4 in which attachment holes 5 are drilled at the other end. The cylindrical portion of the holding cylinder 23 is provided with an inlet 8 that is a long hole in the axial direction. The cylindrical portion inner peripheral surface of the holding cylinder 23 from the end position on the opening 24 side of the inlet 8 to the flange 4 is a stepped portion 54 having an enlarged diameter. A plurality of through holes 47 are provided on the bottom surface of the holding cylinder 23. The through hole 47 is drilled to communicate with a plurality of through passages 46 penetrating in the axial direction of the stator core 32 at an intermediate position between the valley of the slot 6 in the radial direction of the stator core 32 and the outer periphery. The shape of the through-hole 47 is preferably the same as the cross-sectional shape of the through-passage 46, but may be a different shape as long as the refrigerant can flow therethrough.

  Since the stator core 32 has a diameter set so that it can be inserted into an inner peripheral portion excluding the step portion 54 of the holding cylinder 23, the end surface of the stator core 32 can come into contact with the bottom surface of the holding cylinder 23.

  The stator core 32 has a configuration in which a plurality of divided cores 33 stacked in an annular shape are connected in the axial direction. As shown in FIG. 17, the split core 33 has a slot 6, one half of the slot 6, a groove 48 that is a half of the through passage 46, and a groove 49 that is a quadrant of the communication path 45. . That is, the stator core 32 has a plurality of through passages 46 that are formed between the split cores 33 that are in contact with each other in the circumferential direction and penetrate in the axial direction at intermediate positions between the valleys of the radial slots 6 and the outer circumference. As shown in FIG. 16, the through passage 46 preferably has an elongated cross-sectional shape in the circumferential direction that is the magnetic flux direction in order to ensure the cross-sectional area of the magnetic path in the stator core 32. The split core 33 is formed by stacking electromagnetic steel plates in the axial direction.

  The stator core 32 has a communication path 45. The communication passage 45 is formed by grooves 49 of four divided cores 33 that are in contact with each other in the circumferential direction and the axial direction, and allows the cooling passage 44 and each through passage 46 to communicate with each other. The cross-sectional shape of the communication path 45 is circular according to the groove 49 shown in FIG. 17, but the cross-sectional shape is square according to the groove 50 shown in FIG. Moreover, according to the groove | channel 51 shown in FIG. 19, the cross-sectional shape of the communicating path 45 becomes a square or a rectangle. The split core 33 provided with the grooves 49 and 50 is difficult to manufacture with a magnetic steel sheet due to the shape and the arrangement position of the grooves 49 and 50. Therefore, it is preferable that the split core 33 provided with the grooves 49 and 50 is made of a pressed iron core by press molding.

  The holding member 13 includes an annular plate having an inner diameter that is an intermediate dimension between the diameter of the stator core 32 and the valley diameter of the slot 6 and an outer diameter that is substantially equal to the diameter of the holding cylinder 23. On the outer periphery of the annular plate of the pressing member 13, a plurality of flanges 4 project in the radial direction. A mounting hole 5 is drilled in the flange 4 so as to be continuous with the mounting hole 5 of the holding cylinder 23. The annular plate of the pressing member 13 has a cylindrical portion 2 having an inner diameter slightly larger than the outer diameter of the stator core 32 and an outer diameter slightly smaller than the inner diameter of the step portion 54 of the holding cylinder 23, which is concentric with the annular plate. Is erected. The height of the cylindrical portion 2 is set such that when the cylindrical portion 2 is fitted between the stepped portion 54 and the stator core 32, the tip of the cylindrical portion 2 is positioned on the longitudinal end surface of the inlet 8. . In the vicinity of the inner periphery of the annular plate of the pressing member 13, a plurality of through holes 47 that are perforated so as to communicate with the respective through passages 46 that penetrate in the axial direction in the vicinity of the outer periphery of the stator core 32 are provided. The shape of the through-hole 47 is preferably the same as the cross-sectional shape of the through-passage 46, but may be a different shape as long as the refrigerant can flow therethrough.

  When the holding cylinder 23, the stator core 32, and the pressing member 13 are assembled as shown in FIG. 14, there is an annular shape between the step portion 54 that is the inner peripheral surface of the holding cylinder 23 and the outer peripheral surface of the stator core 32. A cooling passage 44 is formed. The width of the cooling passage 44 is defined by the step portion 54 and the cylindrical portion 2 in the longitudinal dimension of the inlet 8. According to this configuration, since the pressing member 13 includes the cylindrical portion 2, the rigidity is improved, whereby the pressing force of the stator core 32 can be increased and the stator core 32 can be firmly fixed. Further, the refrigerant flowing in from the inlet 8 passes through the cooling passage 44, the communication passage 45, and the through passage 46 in order, and is discharged from the bottom surface of the holding cylinder 23 on both sides of the stator core 32 and the through holes 47 of the pressing member 13. And since it rains on the coil end of the coil wound by the slot 6, there exists an outstanding effect that a coil can also be cooled effectively with the stator core 23. FIG.

  As is clear from the above detailed description, according to the stator cooling structure of the present embodiment, the stator cores 30 to 32 are clamped and pressed in the axial direction, and the holding cylinders 20, 22, 23 or the pressing member 11. The cooling passages 40 to 44 are formed between the inner peripheral surface of the stator and the outer peripheral surfaces of the stator cores 30 to 32. Therefore, a cooling passage having a wide contact area is formed on the outer peripheral surfaces of the stator cores 30 to 32, and a large flow passage area of the refrigerant is ensured, so that the stator cores 30 to 32 are cooled extremely effectively. Play.

  In addition, this invention includes what can be implemented in the aspect which added various change, correction, improvement, etc. based on the knowledge of those skilled in the art. Further, it goes without saying that any of the embodiments to which the above-mentioned changes are added is included in the scope of the present invention without departing from the gist of the present invention.

1 Housing 10, 11, 12, 13 Holding member 20, 21, 22, 23 Holding cylinder 30, 31, 32, Stator core 40, 41, 42, 43, 44 Cooling passage

Claims (10)

A cylindrical stator core (30-32);
The stator core (30-32) has a cylindrical shape with a bottom surface at one end in the axial direction, and the stator core (30-32) is inserted into the inner surface of the bottom surface so that one end surface in the axial direction of the stator core (30-32) is in contact with the inner surface. A tube (20-23),
A holding member that abuts the other axial end surface of the stator core (30-32) and is fastened to the housing (1) together with the holding cylinder (20-23) to clamp the stator core (30-32) in the axial direction. (10-13),
A cooling passage (40-44) formed between an inner peripheral surface of the holding cylinder (20, 22, 23) or the pressing member (11) and an outer peripheral surface of the stator core (30-32);
A stator cooling structure comprising:   The holding member (10) has a cylindrical portion (2) inserted into the holding cylinder (20), and the cooling passage (40) has the inlet (8) and the outlet (9). 2. The stator cooling structure according to claim 1, wherein the stator is cooled in the axial direction by a step portion (50) on the inner peripheral surface of the tube (20) and the cylindrical portion (2).   The pressing member (11) has a cylindrical portion (3) inserted into the holding cylinder (21), and the cooling passage (41) is a groove portion (provided on the inner peripheral surface of the cylindrical portion (3)). 51, and includes an inlet (8) and an outlet (9) that are formed in the outer periphery of the holding cylinder (21) and the cylindrical portion (3). Stator cooling structure.   The stator cooling structure according to claim 1, wherein the cooling passage (42) is formed including a groove (52) provided on an inner peripheral surface of the holding cylinder (22).   The stator cooling structure according to claim 1, wherein the cooling passage (43) is formed including a groove (53) provided on an outer peripheral surface of the stator core (31).   A plurality of through passages (46) penetrating in the axial direction near the radial outer periphery of the stator core (32), and a communication passage (45) communicating with each through passage (46) from the cooling passage (44). The stator cooling structure according to claim 1, wherein the stator cooling structure is provided.   The stator cooling structure according to claim 6, wherein the through passage (46) has a cross-sectional shape elongated in a circumferential direction of the stator core (32).   The stator core (32) is formed by laminating a plurality of divided cores (33) in the circumferential direction, and the through passage (46) is formed by a groove (48) provided on a laminated surface of the divided core (33). The stator cooling structure according to claim 6 or 7, wherein:   The stator cooling structure according to any one of claims 6 to 8, wherein the divided core (33) is formed by laminating electromagnetic steel plates in an axial direction.   The said division | segmentation core (33) consists of a powder magnetic core, and is provided with the groove | channel (49) which forms the said through-passage (46) in the contact surface of the said division | segmentation cores (33) of an axial direction. Item 9. The stator cooling structure according to any one of Items 6 to 8.

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