JP6130940B1 - motor - Google Patents

Abstract

A motor with excellent cooling efficiency is provided. A motor includes a stator core that forms a slot between adjacent tooth portions, and a coil that is wound around the tooth portion. When the space adjacent to the outer side in the radial direction of the yoke portion is referred to as an outer peripheral side region, and the space in the slot is referred to as an inner peripheral side region, the motor 10 is supplied with refrigerant through a route that avoids the outer peripheral side region. The refrigerant passage 42 for flowing the refrigerant to the region, the refrigerant passage 64 for flowing the refrigerant to the outer peripheral side region, the refrigerant passage 42 and the refrigerant passage 64 are connected, and the refrigerant after flowing through the refrigerant passage 42 is guided to the refrigerant passage 64. And a refrigerant passage 54q. [Selection] Figure 1

Description

  The present invention relates to a motor.

  Regarding conventional motors, for example, Japanese Utility Model Application Laid-Open No. 3-77260 discloses an electric motor cooling device for the purpose of realizing miniaturization and increasing the cooling effect by directly cooling the vicinity of the opening of the slot. (Patent Document 1). The electric apparatus cooling device disclosed in Patent Document 1 includes a cooling pipe that is provided in an opening of a slot and into which a cooling medium such as cooling oil or cooling water flows.

Japanese Utility Model Publication No. 3-77260

  As disclosed in Patent Document 1 described above, motors having various cooling structures are known. In such a motor, the heat generation from the coil wound around the stator core becomes significant. For this reason, it is required to improve the cooling efficiency of the motor by appropriately arranging the refrigerant passage around the coil.

  Accordingly, an object of the present invention is to solve the above-described problems and to provide a motor having excellent cooling efficiency.

A motor according to the present invention has an annular yoke portion and a plurality of tooth portions extending radially inward from the yoke portion and spaced apart in the circumferential direction, and between adjacent tooth portions. And a coil wound around the tooth portion, and a refrigerant passage forming member provided on the outer periphery of the stator core. A space adjacent to the outside in the radial direction of the yoke portion is referred to as an outer peripheral region, and a space in the slot is referred to as an inner peripheral region. The motor is partitioned by a refrigerant passage forming member that is supplied with a refrigerant that flows in a non-contact state with the refrigerant passage forming member through a path that avoids the outer peripheral side region and that flows the refrigerant to the inner peripheral side region. A third refrigerant passage that communicates between the first refrigerant passage and the second refrigerant passage, and that guides the refrigerant after flowing through the first refrigerant passage to the second refrigerant passage. And further comprising.
A motor according to another aspect of the present invention has an annular yoke portion and a plurality of teeth portions extending radially inward from the yoke portion and spaced apart in the circumferential direction, and are adjacent to each other. A stator core that forms a slot between the matching tooth portions, and a coil that is wound around the tooth portions. A space adjacent to the outside in the radial direction of the yoke portion is referred to as an outer peripheral region, and a space in the slot is referred to as an inner peripheral region. The motor is supplied with a refrigerant through a route that avoids the outer peripheral region, the first refrigerant passage that flows the refrigerant to the inner peripheral region, the second refrigerant passage that flows the refrigerant to the outer peripheral region, the first refrigerant passage, and the second refrigerant passage. A third refrigerant passage that communicates between the refrigerant passages and guides the refrigerant after flowing through the first refrigerant passage to the second refrigerant passage;

  According to the motor configured as described above, first, by flowing a refrigerant that does not exchange heat with the coil in the outer peripheral side region through the first refrigerant passage, the motor is moved from the inner peripheral region closer to the coil that is the heat generation source. Then, the motor is cooled from the outer peripheral side region adjacent to the outside in the radial direction of the yoke portion by flowing the refrigerant after flowing through the first refrigerant passage to the second refrigerant passage through the third refrigerant passage. Thereby, the cooling efficiency of a motor can be improved.

  Preferably, the first refrigerant passage extends along the axial direction of the stator core. The second refrigerant passage extends along the circumferential direction of the stator core.

  According to the motor configured as described above, heat can be efficiently exchanged between the motor and the refrigerant flowing through the first refrigerant passage and the second refrigerant passage.

  Preferably, the third refrigerant passage is provided in a region facing the coil in the axial direction of the stator core. A plurality of first refrigerant passages are provided in the plurality of slots, respectively, and communicate with the third refrigerant passage.

  According to the motor configured as described above, the refrigerant flowing through the plurality of first refrigerant passages can be smoothly guided to the third refrigerant passage.

  Preferably, a plurality of first refrigerant passages are provided in the plurality of slots, respectively. The plurality of first refrigerant passages include a first group of first refrigerant passages arranged in the circumferential direction and a second group of first refrigerant passages arranged in the circumferential direction in a range different from the first refrigerant passage of the first group. . The motor communicates between a fourth refrigerant passage for supplying refrigerant to the first refrigerant passage in the first group, a first refrigerant passage in the first group, and a first refrigerant passage in the second group, and the first group first refrigerant passage. And a fifth refrigerant passage for guiding the refrigerant after flowing through the first refrigerant passage to the first refrigerant passage of the second group.

  According to the motor configured as described above, the first group of first refrigerant passages and the second group of first refrigerant passages are connected in series in the refrigerant flow direction through the fifth refrigerant passage, so that a plurality of The first refrigerant passage can cause the refrigerant to flow evenly.

  Preferably, the third refrigerant passage is provided in a region facing the coil on one side in the axial direction of the stator core. The fourth refrigerant passage is provided in a region facing the coil on one side in the axial direction of the stator core, and forms an annular passage centering on the central axis of the stator core together with the third refrigerant passage. The motor further includes a wall member that partitions the third refrigerant passage and the fourth refrigerant passage. The fifth refrigerant passage is provided in a region facing the coil on the other side in the axial direction of the stator core, and forms an annular passage centering on the central axis of the stator core.

  According to the motor configured as described above, the third refrigerant passage, the fourth refrigerant passage, and the fifth refrigerant passage can be compactly arranged around the coil.

  Preferably, the motor further includes a sixth refrigerant passage for supplying the refrigerant to the first refrigerant passage. The sixth refrigerant passage is provided in a region facing the coil on one side in the axial direction of the stator core, and forms an annular passage centering on the central axis of the stator core. The third refrigerant passage is provided in a region facing the coil on the other side in the axial direction of the stator core, and forms an annular passage centering on the central axis of the stator core.

  According to the motor configured as described above, the third refrigerant passage and the sixth refrigerant passage can be compactly arranged around the coil.

  Preferably, the coil is wound around the teeth portion at a position adjacent to the teeth portion at a position adjacent to the radially inner side of the yoke portion, and at a position adjacent to the inside of the first coil portion in the radial direction. A second coil portion. A 1st refrigerant path is provided in the space which arises between 1st coil parts between the mutually adjacent teeth parts, and the space which arises between 2nd coil parts.

  According to the motor configured as described above, the space between the first coil portion and the second coil portion in the slot can be effectively used as a space for providing the first refrigerant passage.

  As described above, according to the present invention, a motor with excellent cooling efficiency can be provided.

It is a perspective view which shows the motor in Embodiment 1 of this invention. It is sectional drawing which shows the motor in FIG. It is a perspective view which shows the internal structure of the motor in FIG. It is sectional drawing which expands and shows the motor in FIG. 3 partially. It is sectional drawing which shows the refrigerant path formation member along the VV line | wire in FIG. It is sectional drawing which shows the refrigerant path formation member along the VI-VI line in FIG. It is sectional drawing which shows the refrigerant path formation member along the VII-VII line in FIG. It is sectional drawing which expands partially and shows the motor in Embodiment 2 of this invention. It is a perspective view which shows the motor in Embodiment 3 of this invention.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are denoted by the same reference numerals.

(Embodiment 1)
FIG. 1 is a perspective view showing a motor according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view showing the motor in FIG. FIG. 3 is a perspective view showing the internal structure of the motor in FIG. FIG. 4 is a cross-sectional view showing the motor in FIG. 3 partially enlarged.

  1 to 4, a motor 10 according to a first embodiment of the present invention is for a machine tool, and is used, for example, as a motor that rotationally drives a spindle of a machining center. The motor 10 includes a rotor (not shown) and a stator 20 disposed with a gap (gap) provided on the outer periphery of the rotor. A rotor (not shown) is driven to rotate about a central axis 101 indicated by an imaginary line.

  First, the basic structure of the stator 20 will be described. The stator 20 has a stator core 21 and a coil 31.

  The stator core 21 as a whole has a cylindrical shape centered on the central axis 101. The stator core 21 is made of a magnetic material. Stator core 21 has end surface 21a and end surface 21b. The end surface 21 a and the end surface 21 b are disposed at one end and the other end of the stator core 21 in the axial direction of the central shaft 101, respectively. The end surface 21 a and the end surface 21 b extend in a plane orthogonal to the central axis 101. A coil 31 is wound around the stator core 21.

  The stator core 21 has a yoke part 22 and a plurality of teeth parts 23 as its constituent parts (see FIG. 4). The yoke portion 22 has a shape that circulates in an annular shape around the central axis 101. The teeth part 23 has a shape that extends radially inward from the yoke part 22. The teeth portion 23 is opposed to the rotor with a gap at the tip that extends from the yoke portion 22. The plurality of tooth portions 23 are provided at intervals in the circumferential direction around the central axis 101. Slots 24 are formed between teeth portions 23 adjacent to each other in the circumferential direction.

  The coil 31 is wound around each of the plurality of tooth portions 23. The coil 31 is wound so as to pass through the slots 24 located on both sides of the tooth portion 23 and the end face 21a and the end face 21b. The portion of the coil 31 that passes over the end surface 21 a constitutes the coil end portion 32, and the portion of the coil 31 that passes over the end surface 21 b constitutes the coil end portion 33.

  The stator 20 further includes a resin layer 26. The resin layer 26 is provided so as to fill the slot 24. The resin layer 26 is provided so as to cover the coil end portion 32 on the end surface 21a and to cover the coil end portion 33 on the end surface 21b. In the form including the resin layer 26, the stator 20 has a cylindrical shape centered on the central axis 101.

In addition, illustration of the resin layer 26 is abbreviate | omitted in FIG. 1, FIG. 3 and FIG. 9 mentioned later.
FIG. 5 is a cross-sectional view showing the refrigerant passage forming member along the line V-V in FIG. 2. FIG. 6 is a cross-sectional view showing the refrigerant passage forming member along the line VI-VI in FIG. FIG. 7 is a cross-sectional view showing the refrigerant passage forming member along the line VII-VII in FIG. 2. Next, the cooling structure provided in the motor 10 will be described in detail.

  1 to 7, motor 10 includes a refrigerant passage forming member 51, a refrigerant passage forming member 61, a refrigerant passage forming member 71, and a refrigerant passage forming member 41.

  The refrigerant passage forming member 51, the refrigerant passage forming member 61, the refrigerant passage forming member 71, and the refrigerant passage forming member 41 form a refrigerant passage through which a refrigerant such as cooling water or cooling oil can flow. The refrigerant passage forming member 51, the refrigerant passage forming member 61, the refrigerant passage forming member 71, and the refrigerant passage forming member 41 are provided in contact with the stator 20.

  The refrigerant passage forming member 51 has a disk shape centered on the central axis 101. The refrigerant passage forming member 51 is provided on one end side in the axial direction of the central shaft 101 with respect to the stator 20. The refrigerant passage forming member 51 is provided at a position facing the end surface 21 a in the axial direction of the central shaft 101. In the axial direction of the central shaft 101, the coil end portion 32 is located between the end surface 21 a and the refrigerant passage forming member 51. The refrigerant passage forming member 51 is provided directly above the coil end portion 32 through the resin layer 26. The refrigerant passage forming member 51 is provided in contact with the resin layer 26 on the end surface 21 a of the stator 20.

  The refrigerant passage forming member 51 is configured by combining a main body portion 52, a lid portion 53, a wall member 56 and a wall member 57. The main body 52 has a concave cross section and is provided so as to circulate around the central axis 101 in an annular shape. The lid 53 is provided so as to close the opening of the main body 52. The wall member 56 and the wall member 57 have a wall shape and are provided so as to close the concave cross section of the main body 52. The wall member 56 and the wall member 57 are provided apart from each other in the circumferential direction around the central axis 101.

  A refrigerant passage 54 is formed by the refrigerant passage forming member 51 configured as described above. The refrigerant passage 54 is provided in a region facing the coil 31 (coil end portion 32) on one side of the central shaft 101 in the axial direction. The refrigerant passage 54 forms an annular passage centered on the central axis 101 in a region facing the coil end portion 32. When the space adjacent to the outer side in the radial direction of the yoke portion 22 is referred to as the outer peripheral side region 110 (see FIG. 2), the refrigerant passage 54 is provided at a position shifted from the outer peripheral side region 110. The refrigerant passage 54 is surrounded by the main body 52 and the lid 53. The refrigerant passage 54 is divided into a refrigerant passage 54p and a refrigerant passage 54q by a wall member 56 and a wall member 57.

  The refrigerant passage forming member 71 has a disk shape centered on the central axis 101. The refrigerant passage forming member 71 is provided on the other end side in the axial direction of the central shaft 101 with respect to the stator 20. The refrigerant passage forming member 71 is provided at a position facing the end surface 21 b in the axial direction of the central shaft 101. In the axial direction of the central shaft 101, the coil end portion 33 is located between the end surface 21 b and the refrigerant passage forming member 71. The refrigerant passage forming member 71 is provided directly above the coil end portion 33 through the resin layer 26. The refrigerant passage forming member 71 is provided in contact with the resin layer 26 on the end surface 21 b of the stator 20.

  The refrigerant passage forming member 71 is configured by combining a main body portion 72 and a lid portion 73. The main body 72 has a concave cross section and is provided so as to circulate around the central axis 101 in an annular shape. The lid 73 is provided so as to close the opening of the main body 72.

  A refrigerant passage 74 is formed by the refrigerant passage forming member 71 configured as described above. The refrigerant passage 74 is provided in a region facing the coil 31 (coil end portion 33) on the other side in the axial direction of the central shaft 101. The refrigerant passage 74 forms an annular passage centering on the central axis 101 in a region facing the coil end portion 33. The refrigerant passage 74 is provided at a position shifted from the outer peripheral region 110. The refrigerant passage 74 is surrounded by the main body portion 72 and the lid portion 73.

  The refrigerant passage forming member 61 has a cylindrical shape with the central axis 101 as the center. The refrigerant passage forming member 61 is provided on the outer periphery of the stator 20. The refrigerant passage forming member 61 is provided between the refrigerant passage forming member 51 and the refrigerant passage forming member 71 in the axial direction of the central shaft 101. The refrigerant passage forming member 61 is provided in contact with the stator core 21 (yoke portion 22) of the stator 20 and the resin layer 26 on the end surface 21a and the end surface 21b.

  The refrigerant passage forming member 61 is configured by combining a main body portion 62, a lid portion 63, and a wall member 65. The main body portion 62 has a concave cross section and is provided so as to circulate around the central axis 101 in an annular shape. The lid 63 is provided so as to close the opening of the main body 62. The wall member 65 has a wall shape and is provided so as to close the concave cross section of the main body 62.

  A refrigerant passage 64 is formed by the refrigerant passage forming member 61 configured as described above. The refrigerant passage 64 is provided so that the refrigerant flows through the outer peripheral side region 110. The refrigerant passage 64 forms an annular passage around the central axis 101 on the outer periphery of the stator 20. The refrigerant passage 64 is surrounded by the main body 62 and the lid 63. The refrigerant passage 64 is not limited to the annular passage described above, and may be provided, for example, so as to extend spirally around the central axis 101, or as a whole while reciprocating along the axial direction of the central axis 101, It may be provided so as to go around the axis of the central axis 101.

  In FIG. 1 and FIG. 9 to be described later, the lid portion 53 and the lid portion 73 are not shown. Further, in FIG. 1 and FIG. 9 described later, a part of the refrigerant passage forming member 61 in the circumferential direction is not shown.

  A communication hole 58 is formed in the refrigerant passage forming member 51 (main body portion 52). The communication hole 58 passes through the refrigerant passage forming member 51 (main body portion 52). The communication hole 58 is provided so as to communicate between the refrigerant passage 54q and the refrigerant passage 64.

  As described above, the refrigerant passage forming member 51, the refrigerant passage forming member 61, and the refrigerant passage forming member 71 are provided so as to surround the stator 20 from the outer peripheral side and both sides in the axial direction of the central shaft 101. . The stator 20, the refrigerant passage forming member 51, the refrigerant passage forming member 61, and the refrigerant passage forming member 71 have a cylindrical shape centering on the central axis 101 as a whole.

  The refrigerant passage forming member 41 is provided in the slot 24. The refrigerant passage forming member 41 is embedded in the resin layer 26. The refrigerant passage forming member 41 is provided in contact with the resin layer 26 filling the slot 24 in the stator 20. The refrigerant passage forming member 41 is provided in each of the plurality of slots 24. Each slot 24 is provided with one refrigerant passage forming member 41. The plurality of refrigerant passage forming members 41 are provided at intervals in the circumferential direction around the central axis 101.

  The refrigerant passage forming member 41 is made of a pipe material. The refrigerant passage forming member 41 extends along the axial direction of the central shaft 101. The refrigerant passage forming member 41 is connected to the refrigerant passage forming member 51 and the refrigerant passage forming member 71 at both ends extending along the axial direction of the central shaft 101.

  A refrigerant passage 42 is formed by the refrigerant passage forming member 41 configured as described above. When the space in the slot 24 is referred to as the inner peripheral region 120 (see FIG. 2), the refrigerant passage 42 is provided so that the refrigerant flows through the inner peripheral region 120. The refrigerant passage 42 communicates with the refrigerant passage 54 and the refrigerant passage 74.

  A plurality of refrigerant passages 42 are formed by the plurality of refrigerant passage forming members 41, respectively. The plurality of refrigerant passages 42 includes a first group of refrigerant passages 42p arranged in the circumferential direction, and a second group of refrigerant passages 42q arranged in the circumferential direction in a range different from the first group of refrigerant passages 42p (see FIG. 3). See The first group of refrigerant passages 42p among the plurality of refrigerant passages 42 communicates with the refrigerant passage 54p of the refrigerant passage 54, and the second group of refrigerant passages 42q among the plurality of refrigerant passages 42 is connected to the refrigerant passage 54. Of these, it communicates with the refrigerant passage 54q.

  Note that the refrigerant passage forming member 41 is not necessarily provided in all of the plurality of slots 24. For example, the refrigerant passage forming member 41 is disposed in every other slot 24 among the plurality of slots 24 arranged in the circumferential direction. It may be provided.

  The refrigerant flow in the motor 10 will be described with reference to FIGS. 1 to 3. The refrigerant is first supplied to the refrigerant passage 54p (the refrigerant flow indicated by the arrow 131). The refrigerant supplied to the refrigerant passage 54p is split into two from the supply position, and flows in the circumferential direction around the central axis 101 (refrigerant flow indicated by an arrow 132). The refrigerant flows into the first group of refrigerant passages 42p while flowing through the refrigerant passage 54p.

  The refrigerant that has flowed into the first group of refrigerant passages 42p flows through the inner peripheral side region 120 in the slot 24 (refrigerant flow indicated by an arrow 133). The refrigerant flows into the refrigerant passage 74 from the first group of refrigerant passages 42p and flows in the circumferential direction around the central axis 101 (refrigerant flow indicated by an arrow 134). The refrigerant flows into the second group of refrigerant passages 42q while flowing through the refrigerant passage 74.

  The refrigerant that has flowed into the second group of refrigerant passages 42q flows through the inner peripheral region 120 in the slot 24 (the refrigerant flow indicated by the arrow 135). The refrigerant flows from the second group of refrigerant passages 42q into the refrigerant passage 54q and flows in the circumferential direction around the central axis 101 (refrigerant flow indicated by an arrow 136). The refrigerant flows from the refrigerant passage 54q into the refrigerant passage 64 through the communication hole 58 (refrigerant flow indicated by an arrow 137).

  The refrigerant that has flowed into the refrigerant passage 64 flows in the outer peripheral side region 110 adjacent to the radially outer side of the yoke portion 22 (refrigerant flow indicated by an arrow 138). The refrigerant flows from one side of the wall member 65 to the other side, and is then discharged from the refrigerant passage 64 to the outside (refrigerant flow indicated by an arrow 139).

  As described above, in the motor 10 according to the present embodiment, the refrigerant sequentially flows through the refrigerant passage 54p, the first group of refrigerant passages 42p, the refrigerant passage 74, the second group of refrigerant passages 42q, the refrigerant passage 54q, and the refrigerant passage 64. . In this case, the refrigerant passage 54p that supplies the refrigerant to the first group of refrigerant passages 42p and the refrigerant passage 74 that guides the refrigerant from the first group of refrigerant passages 42p to the second group of refrigerant passages 42q are from the outer peripheral side region 110. Since it is in a shifted position, the refrigerant is supplied to the inner peripheral side region 120 through a route that avoids the outer peripheral side region 110. Thus, first, the motor 10 is cooled from the inner peripheral side region 120 that is closer to the coil 31 that is a heat generation source by the refrigerant that remains at a very low temperature because it does not pass through the outer peripheral side region 110. Further, the refrigerant after flowing through the refrigerant passage 42 (first group refrigerant passage 42p and second group refrigerant passage 42q) is guided to the refrigerant passage 64 through the refrigerant passage 54q. Thereby, the motor is cooled from the outer peripheral side region 110 using the refrigerant after the heat exchange with the coil 31 is completed in the inner peripheral side region 120. In the present embodiment, the motor 10 can be efficiently cooled by such a two-stage cooling process.

  In the present embodiment, the first group of refrigerant passages 42p and the second group of refrigerant passages 42q are connected in series in the cooling flow direction via the refrigerant passage 74. With such a configuration, it is possible to suppress the variation in the flow rate of the refrigerant supplied to the plurality of refrigerant passages 42 and to cool the motor from the inner peripheral side region 120 more evenly.

  The structure of the motor 10 according to the first embodiment of the present invention described above will be described together. The motor 10 according to the present embodiment has an annular yoke portion 22 and extends from the yoke portion 22 radially inward. A stator core 21 having a plurality of teeth portions 23 provided at intervals in the circumferential direction and forming slots 24 between adjacent tooth portions 23, and a coil 31 wound around the teeth portions 23. Prepare. A space adjacent to the outer side in the radial direction of the yoke portion 22 is referred to as an outer peripheral region 110, and a space in the slot 24 is referred to as an inner peripheral region 120. In the motor 10, the refrigerant is supplied through a route that avoids the outer peripheral side region 110, and the refrigerant passage 42 as a first refrigerant passage that flows the refrigerant to the inner peripheral side region 120 and the second refrigerant passage that flows the refrigerant to the outer peripheral side region 110. And a refrigerant passage 54q as a third refrigerant passage that communicates between the refrigerant passage 42 and the refrigerant passage 64 and guides the refrigerant after flowing through the refrigerant passage 42 to the refrigerant passage 64.

  The refrigerant passage 42 extends along the axial direction of the stator core 21. The refrigerant passage 64 extends along the circumferential direction of the stator core 21.

  The refrigerant passage 54q is provided in a region facing the coil 31 in the axial direction of the stator core 21. A plurality of refrigerant passages 42 are respectively provided in the plurality of slots 24 and communicate with the refrigerant passage 54q.

  The plurality of refrigerant passages 42 include a first group of refrigerant passages 42p arranged in the circumferential direction and a second group of refrigerant passages 42q arranged in the circumferential direction in a range different from the first group of refrigerant passages 42p. The motor 10 communicates between a refrigerant passage 54p as a fourth refrigerant passage for supplying refrigerant to the first group of refrigerant passages 42p, and between the first group of refrigerant passages 42p and the second group of refrigerant passages 42q. And a refrigerant passage 74 as a fifth refrigerant passage for guiding the refrigerant after flowing through the refrigerant passage 42p of the group to the refrigerant passage 42q of the second group.

  The refrigerant passage 54q is provided in a region facing the coil 31 on one side of the stator core 21 in the axial direction. The refrigerant passage 54p is provided in a region facing the coil 31 on one side in the axial direction of the stator core 21, and forms an annular passage centering on the central axis of the stator core 21 together with the refrigerant passage 54q. The motor 10 further includes a wall member 56 and a wall member 57 that partition between the refrigerant passage 54q and the refrigerant passage 54p. The refrigerant passage 74 is provided in a region facing the coil 31 on the other side in the axial direction of the stator core 21, and forms an annular passage centering on the central axis of the stator core 21.

  According to the motor 10 thus configured in the first embodiment of the present invention, the cooling efficiency of the motor 10 can be improved by appropriately arranging the refrigerant passage around the coil 31.

(Embodiment 2)
FIG. 8 is a partially enlarged cross-sectional view of the motor according to the second embodiment of the present invention. FIG. 8 is a diagram corresponding to FIG. 4 in the first embodiment. The motor in the present embodiment basically has the same structure as that of motor 10 in the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

  Referring to FIG. 8, in the present embodiment, coil 31 includes a first coil portion 31A and a second coil portion 31B. The first coil portion 31 </ b> A is wound around the tooth portion 23 at a position adjacent to the inside in the radial direction of the yoke portion 22. The second coil portion 31B is wound around the tooth portion 23 at a position adjacent to the radially inner side of the first coil portion 31A. A substantially triangular space surrounded by the first coil portion 31 </ b> A, the second coil portion 31 </ b> B, and the yoke portion 22 is formed between the adjacent tooth portions 23.

  In each slot 24, two refrigerant passage forming members 41 (41A, 41B) are provided. The refrigerant passage forming member 41 </ b> A and the refrigerant passage forming member 41 </ b> B are provided in a substantially triangular space surrounded by the first coil portion 31 </ b> A, the second coil portion 31 </ b> B, and the yoke portion 22 in the slot 24.

  A refrigerant passage 42A and a refrigerant passage 42B are formed by the refrigerant passage forming member 41A and the refrigerant passage forming member 41B, respectively. The refrigerant passage 42 </ b> A is provided in a space generated between the first coil portions 31 </ b> A between the adjacent tooth portions 23. The refrigerant passage 42B is provided in a space generated between the second coil portions 31B between the tooth portions 23 adjacent to each other.

  According to the motor according to the second embodiment of the present invention configured as described above, the effects described in the first embodiment can be similarly obtained. In addition, the refrigerant passage 42 can be provided by effectively utilizing the space generated between the coils in the slot 24.

(Embodiment 3)
FIG. 9 is a perspective view showing a motor according to Embodiment 3 of the present invention. FIG. 9 is a diagram corresponding to FIG. 1 in the first embodiment. The motor in the present embodiment basically has the same structure as that of motor 10 in the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

  Referring to FIG. 9, in the present embodiment, refrigerant passage forming member 51 is configured by combining body portion 52 and lid portion 53 (wall member 56 and wall member 57 in FIG. 1 are combined). Not provided). A refrigerant passage 54 is formed by the refrigerant passage forming member 51.

  1 is not formed in the coolant passage forming member 51 (main body portion 52). Instead, a communication hole 81 is formed in the refrigerant passage forming member 71 (main body portion 72). The communication hole 81 passes through the refrigerant passage forming member 71 (main body portion 72). The communication hole 81 is provided so as to communicate between the refrigerant passage 74 and the refrigerant passage 64.

  The refrigerant flow in the present embodiment will be described. First, the refrigerant is supplied to the refrigerant passage 54 (the refrigerant flow indicated by the arrow 141). The refrigerant supplied to the refrigerant passage 54 is split into two from the supply position, and flows in the circumferential direction around the central axis 101 (refrigerant flow indicated by an arrow 142). The refrigerant flows into the refrigerant passage 42 while flowing through the refrigerant passage 54.

  The refrigerant that has flowed into the refrigerant passage 42 flows through the inner peripheral region 120 in the slot 24 (refrigerant flow indicated by an arrow 143). The refrigerant flows into the refrigerant passage 74 from the refrigerant passage 42 and flows in the circumferential direction around the central axis 101 (refrigerant flow indicated by an arrow 144).

  The refrigerant flows from the refrigerant passage 74 into the refrigerant passage 64 through the communication hole 81 (refrigerant flow indicated by an arrow 145). The refrigerant that has flowed into the refrigerant passage 64 flows in the outer peripheral side region 110 adjacent to the radially outer side of the yoke portion 22 (refrigerant flow indicated by an arrow 146). The refrigerant flows from one side of the wall member 65 to the other side, and is then discharged from the refrigerant passage 64 to the outside (refrigerant flow indicated by an arrow 147).

  When the structure of the motor according to the third embodiment of the present invention described above is described together, the motor according to the present embodiment includes an annular yoke portion 22 and the yoke portion 22 extending radially inward. A stator core 21 having a plurality of teeth portions 23 provided at intervals in the circumferential direction and forming slots 24 between adjacent tooth portions 23, and a coil 31 wound around the teeth portions 23 are provided. A space adjacent to the outer side in the radial direction of the yoke portion 22 is referred to as an outer peripheral region 110, and a space in the slot 24 is referred to as an inner peripheral region 120. The motor is supplied with a refrigerant through a route avoiding the outer peripheral side region 110, and serves as a refrigerant passage 42 as a first refrigerant passage for flowing the refrigerant to the inner peripheral side region 120 and a second refrigerant passage for flowing the refrigerant to the outer peripheral side region 110. And a refrigerant passage 74 as a third refrigerant passage that communicates between the refrigerant passage 42 and the refrigerant passage 64 and guides the refrigerant after flowing through the refrigerant passage 42 to the refrigerant passage 64.

  The motor further includes a refrigerant passage 54 as a sixth refrigerant passage for supplying the refrigerant to the refrigerant passage 42. The refrigerant passage 54 is provided in a region facing the coil 31 on one side in the axial direction of the stator core 21, and forms an annular passage centering on the central axis of the stator core 21. The refrigerant passage 74 is provided in a region facing the coil 31 on the other side in the axial direction of the stator core 21, and forms an annular passage centering on the central axis of the stator core 21.

  According to the thus configured motor of the third embodiment of the present invention, the effects described in the first embodiment can be similarly obtained.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention is applied to, for example, a motor that rotationally drives a spindle of a machining center.

  10 motor, 20 stator, 21 stator core, 21a, 21b end face, 22 yoke part, 23 teeth part, 24 slot, 26 resin layer, 31 coil, 31A first coil part, 31B second coil part, 32, 33 coil end part 41, 41A, 41B, 51, 61, 71 Refrigerant passage forming member, 42, 42A, 42B, 42p, 42q, 54, 54p, 54q, 64, 74 Refrigerant passage, 52, 62, 72 Body portion, 53, 63 , 73 Lid, 56, 57, 65 Wall member, 58, 81 Communication hole, 101 Central axis, 110 Outer peripheral region, 120 Inner peripheral region.

Claims (7)

A stator core having an annular yoke portion and a plurality of tooth portions extending radially inward from the yoke portion and spaced apart in the circumferential direction, and forming a slot between the adjacent tooth portions When,
A coil wound around the teeth portion ;
A refrigerant passage forming member provided on the outer periphery of the stator core ,
When the space adjacent to the outside in the radial direction of the yoke portion is referred to as an outer peripheral side region, and the space in the slot is referred to as an inner peripheral side region,
A refrigerant that flows in a non-contact state with the refrigerant passage forming member by a path that avoids the outer peripheral region, a first refrigerant passage that flows the refrigerant to the inner peripheral region,
A second refrigerant passage that is partitioned by the refrigerant passage forming member and flows the refrigerant to the outer peripheral side region;
A motor comprising: a third refrigerant passage that communicates between the first refrigerant passage and the second refrigerant passage and guides the refrigerant after flowing through the first refrigerant passage to the second refrigerant passage. The first refrigerant passage extends along an axial direction of the stator core,
The motor according to claim 1, wherein the second refrigerant passage extends along a circumferential direction of the stator core. The third refrigerant passage is provided in a region facing the coil in the axial direction of the stator core,
The motor according to claim 1, wherein a plurality of the first refrigerant passages are respectively provided in the plurality of slots and communicated with the third refrigerant passage. A plurality of the first refrigerant passages are respectively provided in the plurality of slots;
The plurality of first refrigerant passages include a first group of first refrigerant passages arranged in the circumferential direction, and a second group of first refrigerant passages arranged in the circumferential direction in a range different from the first refrigerant passage of the first group. Including
A fourth refrigerant passage for supplying refrigerant to the first group of first refrigerant passages;
The first refrigerant passage of the second group communicates between the first refrigerant passage of the first group and the first refrigerant passage of the second group, and the refrigerant after flowing through the first refrigerant passage of the first group is used as the first refrigerant passage of the second group. The motor according to any one of claims 1 to 3, further comprising a fifth refrigerant passage leading to The third refrigerant passage is provided in a region facing the coil on one side in the axial direction of the stator core,
The fourth refrigerant passage is provided in a region facing the coil on one side in the axial direction of the stator core, and forms an annular passage around the central axis of the stator core together with the third refrigerant passage,
A wall member partitioning between the third refrigerant passage and the fourth refrigerant passage;
5. The motor according to claim 4, wherein the fifth refrigerant passage is provided in a region facing the coil on the other side in the axial direction of the stator core, and forms an annular passage centering on a central axis of the stator core. A sixth refrigerant passage for supplying refrigerant to the first refrigerant passage;
The sixth refrigerant passage is provided in a region facing the coil on one side in the axial direction of the stator core, and forms an annular passage centering on the central axis of the stator core,
The said 3rd refrigerant | coolant channel | path is provided in the area | region which opposes the said coil in the other in the axial direction of the said stator core, and makes | forms the cyclic | annular channel | path centering on the center axis | shaft of the said stator core. The motor described. The coil is wound around the teeth portion at a position adjacent to the tooth portion at a position adjacent to the inside of the yoke portion in the radial direction, and at a position adjacent to the inside of the first coil portion in the radial direction. A second coil portion to be
The said 1st refrigerant path is provided in the space which arises between the said 1st coil parts between the said teeth parts adjacent to each other, and the space which arises between 2nd coil parts. The motor described.

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