JP6660920B2 - Rotary electric machine, divided partition structure, and method of assembling rotary electric machine - Google Patents

Description

  The present invention relates to a rotating electric machine, a divided partition structure used for the same, and a method for assembling the rotating electric machine.

  The rotating electric machine has a rotor, a stator, and a frame that houses them.

  The rotor has a rotor shaft that is rotatably supported at both ends by bearings and extends in the direction of the rotation axis, and a rotor core attached radially outside the rotor shaft.

  The stator has a stator core disposed radially outside the rotor core and a stator winding penetrating through the stator core.

  The rotor core and the stator are housed in a frame disposed radially outside thereof. Both sides in the rotation axis direction of the frame are closed by bearing brackets. Each bearing is supported by a bearing bracket.

JP-A-10-196589

  In rotary electric machines, iron loss occurring in the rotor core and stator core, copper loss occurring in the stator winding and the rotor winding or the rotor conductor, friction loss in the bearing, etc. are the main efficiency reducing factors. Yes, these are factors of heat generation.

  In a bearing, for example, in the case of a sliding bearing, heat is generated due to friction between the rotor shaft and the bearing, and in the case of a ball bearing, heat is generated due to friction inside the bearing. Therefore, it is necessary to remove this generated heat. On the other hand, inside the rotating electric machine, heat generated on the rotor and stator sides moves to the bearing side via cooling air in the machine or by heat conduction or heat radiation.

  In order to protect the bearing, cooling of the bearing is an important issue (see Patent Document 1). Therefore, it is not preferable for the bearing to protect the bearing that the bearing has its own heat-generating portion and heat flows in from the other.

  Therefore, an object of the present invention is to suppress heat transfer from a rotor and a stator side to a bearing side in a rotating electric machine.

In order to achieve the above object, a rotating electric machine according to the present invention includes a rotor having a rotor shaft extending in the axial direction and rotatably supported, and a rotor core mounted radially outside the rotor shaft. And a stator having a cylindrical stator core provided radially outside the rotor core, and a stator winding that passes through the stator core in the axial direction; and A frame that is disposed outside and accommodates the rotor core and the stator, supports the rotor shaft on both sides of the rotor shaft in the axial direction with the rotor core interposed therebetween, a bearing, and a bearing adjacent to the bearing. And two bearing structures mounted on both ends of the frame to support the two bearing structures, the bearing structure including an annular bearing inner oil drain disposed closer to the rotor core than the bearing. bracket , At least one of the two bearing structures, and at least one split partition structure that splits a space between the stator and the stator in the axial direction, wherein the split partition structure is provided with the bearing inner oil drain. And a radially inner side is formed with a through hole through which the rotor shaft penetrates, and a radially outer portion is mounted on the first partition plate formed in an annular shape and the bearing bracket. A second partition plate that is radially expanded and has a circular opening formed radially inward, and the first partition plate is sandwiched between the first partition plate and the second partition plate. Or an annular compressible member attached to any of the second partition plates, wherein the diameter of the opening of the second partition plate is larger than the outer diameter of the bearing inner oil drain, and The first partition plate Than the outer diameter is smaller, characterized in that.
In addition, a rotating electric machine according to the present invention includes a rotor having a rotor shaft extending in the axial direction and rotatably supported, a rotor core mounted radially outside the rotor shaft, and the rotor core. A stator having a cylindrical stator core provided radially outward of the stator, and a stator having a stator winding penetrating the stator core in the axial direction, and the stator being disposed radially outside of the stator. A frame for accommodating a rotor core and the stator, supporting the rotor shaft on both axial sides of the rotor shaft with the rotor core interposed therebetween, and a bearing; Two bearing structures provided with an annular bearing inner oil drain disposed on the core side; two bearing brackets attached to both ends of the frame to support the two bearing structures; Bearing structure At least one of the body and at least one split partition structure that splits a space between the stator in the axial direction, wherein the split partition structure is attached to the bearing inner oil drain and has a diameter. A radially inner portion is formed with a through hole through which the rotor shaft penetrates, and a radially outer portion is attached to the bearing bracket and a first partition plate formed in an annular shape, and is radially expanded by being attached to the bearing bracket. A second partition plate having a circular opening formed radially inward thereof, wherein the diameter of the opening of the second partition plate is larger than the outer diameter of the bearing inner oil drain, and The first partition plate is formed to be smaller than the outer diameter of the first partition plate, and the first partition plate and the second partition plate are formed so that opposing portions thereof are in close contact with each other, and the first partition plate and the second partition plate are formed so as to be in close contact with each other. Fewer partitions Is one also has flexibility in the axial direction, it is characterized.

Further, the divided partition structure according to the present invention, a rotor having a rotor shaft and a rotor core, a stator having a stator core and a stator winding, a frame, and supporting the rotor shaft, Two bearing structures each including a bearing, an annular bearing inner oil drain disposed adjacent to the bearing and closer to the rotor core than the bearing, and two bearings supporting the two bearing structures And a bracket that divides a space between at least one of the two bearing structures of the rotating electric machine having the bracket and the stator in the axial direction. The rotor shaft extends through in the radial direction, and a through hole through which the rotor shaft penetrates is formed. The radially outer portion is attached to the bearing bracket and the first partition plate formed in an annular shape. A second partition plate having a circular opening formed radially inward, and the first partition plate or the second partition at a position sandwiched between the first partition plate and the second partition plate. An annular compressible member attached to one of the plates, wherein the diameter of the opening of the second partition plate is larger than the outer diameter of the oil drainage inside the bearing, and the first partition plate. Characterized in that it is formed smaller than the outer diameter of.
Further, the divided partition structure according to the present invention, a rotor having a rotor shaft and a rotor core, a stator having a stator core and a stator winding, a frame, and supporting the rotor shaft, two bearings for supporting the bearing, two and a bearing structure comprising a bearing inner oil cutting ring arranged on the rotor core side of the bearing adjacent to said bearing, said two bearing structures And a bracket that divides a space between at least one of the two bearing structures of the rotating electric machine having the bracket and the stator in the axial direction. The rotor shaft extends through in the radial direction, and a through hole through which the rotor shaft penetrates is formed. The radially outer portion is attached to the bearing bracket and the first partition plate formed in an annular shape. And a second partition plate having a circular opening formed radially inward, and the diameter of the opening of the second partition plate is larger than the outer diameter of the bearing inner oil drain, and The first partition plate is formed to be smaller than the outer diameter of the first partition plate, and the first partition plate and the second partition plate are formed such that opposing portions are in close contact with each other, and the first partition plate and the second At least one of the two partition plates has flexibility in the axial direction .

  According to the present invention, in a rotating electric machine, heat transfer from the rotor and the stator to the bearing can be suppressed.

It is a longitudinal section showing the composition of the rotary electric machine concerning a 1st embodiment. FIG. 2 is a partial upper half longitudinal sectional view showing a configuration of a divided partition structure of the rotary electric machine according to the first embodiment and its periphery. FIG. 3 is an upper half longitudinal sectional view showing a first partition plate of a divided partition structure of the rotary electric machine according to the first embodiment. FIG. 3 is an upper half longitudinal sectional view showing a second partition plate of the divided partition structure of the rotary electric machine according to the first embodiment. FIG. 4 is a flowchart showing an assembling procedure of the rotating electric machine according to the first embodiment. FIG. 9 is a partial vertical cross-sectional view illustrating a configuration of a divided partition structure of a rotary electric machine according to a second embodiment and a periphery thereof.

  Hereinafter, a rotary electric machine and a divided partition structure according to the present invention will be described with reference to the drawings. Here, the same or similar parts are denoted by the same reference numerals, and redundant description will be omitted.

[First Embodiment]
FIG. 1 is a longitudinal sectional view showing the configuration of the rotating electric machine according to the first embodiment. The rotating electric machine 100 includes a rotor 10, a stator 20, a bearing structure 30, a frame 40, two bearing brackets 45, and two divided partition structures 50.

  The rotor 10 has a rotor shaft 11 extending in the axial direction, and a rotor core 12 mounted radially outside the rotor shaft 11. The rotor shaft 11 is rotatably supported on both sides in the axial direction with the rotor core 12 interposed therebetween by a bearing structure 30. A plurality of rotor slots (not shown) are formed on a radially outer surface of the rotor core 12 so as to be circumferentially spaced from each other and penetrate the rotor core 12 in the axial direction. A conductor bar 13 extends through each of the rotor slots. The conductor bars 13 are electrically and mechanically connected to each other at both ends in the axial direction of the rotor core 12 by short-circuit rings 14 (FIG. 2).

  The stator 20 has a cylindrical stator core 21 provided radially outside the rotor core 12 via the gap 18, and a plurality of stator windings 22. The stator windings 22 penetrate through a plurality of stator slots (not shown) formed on the radially inner surface of the stator core 21 at circumferentially spaced intervals and penetrating the stator core 21 in the axial direction.

  A cylindrical frame 40 extending in the axial direction is provided radially outside the rotor core 12 and the stator 20 so as to house them. Bearing brackets 45 are attached to both ends of the frame 40 in the axial direction. The frame 40 and the bearing bracket 45 form a closed space 41.

  Outside each of the rotor cores 12 in the axial direction, the closed space 41 is divided into three by the two partitioning structures 50 into a rotor core side space 41a and two bearing side spaces 41b.

  FIG. 2 is a partial upper half vertical cross-sectional view showing the configuration of the divided partition structure and its surroundings, and shows details of a portion II in FIG.

  The bearing structure 30 has a bearing 31, a bearing inner oil drain 32, and a bearing outer oil drain 33. The bearing 31 has a rotating part 31a, a rolling element 31b, and a fixed part 31c. The rotating part 31 a of the bearing 31 is attached to the rotor shaft 11. The fixed portion 31c is disposed radially outside the rotating portion 31a with the rolling element 31b interposed therebetween, and is supported by the bearing bracket 45.

  The rolling element 31b is a plurality of elements having a shape such as a spherical shape or a barrel shape, and is arranged between the rotating part 31a and the fixed part 31c, and each rotates with the rotation of the rotating part 31a. Although FIG. 2 shows an example in which the bearing 31 is a rolling bearing, the bearing 31 may be a sliding bearing.

  The bearing inner oil drain 32 is annular and is disposed inside the bearing 31 in the axial direction, that is, adjacent to the bearing 31 on the rotor core 12 side. The bearing inner oil drain 32 is fixed to the bearing bracket 45 by a fixing bolt 45a so as to be coaxial with the rotor shaft 11 via a gap radially outside the rotor shaft 11. That is, a plurality of fixing bolt holes 45b are formed in the bearing bracket 45 at intervals in the circumferential direction, and fixing bolt screw holes 32b are formed at corresponding positions of the bearing inner oil drain 32. . The fixing bolt 45a is screwed with the fixing bolt screw hole 32b to connect the bearing inner oil drain 32 to the bearing bracket 45.

  The bearing outer oil drain 33 is attached to the bearing bracket 45, and is disposed outside the bearing 31 adjacent to the bearing 31 in the axial direction, that is, on the opposite side of the bearing inner oil drain 32.

  The divided partition structure 50 has a first partition plate 51, a second partition plate 54, and a compressible member 53.

  The first partitioning plate inner annular disk portion 51a (FIG. 3) is arranged radially outside the rotor shaft 11, is radially expanded, and has an annular shape in which a concentric opening is formed at the center. The first partition plate 51 is attached to the bearing inner oil drain 32 by a first partition plate fastener 52. The first partition plate fastener 52 is, for example, a bolt that is screwed into the first partition plate fastener screw hole 32 a formed in the bearing inner oil drain 32. The radially innermost part of the first partition plate 51 is radially opposed to the rotor shaft 11 via the gap g.

  The second partition plate 54 is provided outside the first partition plate inner annular disk portion 51a in the axial direction, that is, on the bearing bracket 45 side, and has a ring shape larger in diameter than the first partition plate inner annular disk portion 51a.

  The second partition plate 54 is attached to the bearing bracket 45 by a second partition plate fastener 55 via an annular spacer 55a. The annular spacer 55a is an annular plate, and is used when the second partition plate 54 and the bearing bracket 45 cannot be directly connected in shape, but is unnecessary when they can be directly connected. The second partition plate fastener 55 is, for example, a bolt that is screwed into a screw hole formed in the bearing bracket 45.

  The compressible member 53 is annular and is sandwiched between the first partition plate 51 and the second partition plate 54. As viewed from the compressible member 53, the first partition plate 51 is on the inner side in the axial direction, that is, on the side of the rotor core 12, and the second partition plate 54 is on the outer side in the axial direction, that is, on the bearing bracket 45 side.

  FIG. 3 is an upper half longitudinal sectional view showing the first partition plate. The first partition plate 51 has a first partition plate inner annular disk portion 51a, a first partition plate conical portion 51c, a first partition plate outer annular disk portion 51b, and a first partition plate cylindrical portion 51d.

  The first partition plate 51 has a configuration in which a first partition plate inner annular disk portion 51a, a first partition plate conical portion 51c, and a first partition plate outer annular disk portion 51b are sequentially connected radially outward. The end of the first partition plate cylindrical portion 51d is connected to an opening formed at the center of the first partition plate inner annular disk portion 51a. Further, the first partition plate 51 expands radially outward and also expands in the axial direction toward the bearing bracket 45.

  The first partitioning plate inner annular disk portion 51a is arranged radially outside the rotor shaft 11, extends radially, and has an annular shape in which a concentric opening is formed at the center. The outer diameter of the first partition plate inner annular disk portion 51a is larger than the diameter of the radially outer surface of the bearing inner oil drain 32. A plurality of fastener holes 51h through which the first partition fastener 52 penetrates are formed in the first partition inner circular disk portion 51a at intervals in the circumferential direction.

  The first partition plate outer annular disk portion 51b corresponds to a radially outer portion of the first partition plate 51, and has a circular disk shape in which a concentric opening is formed in the disk, and the diameter of the opening is equal to the first partition plate. It is larger than the diameter of the inner annular disk portion 51a.

  The first partition plate conical portion 51c connects the circumference of the first partition plate inner annular disk portion 51a and the edge of the opening of the first partition plate outer annular disk portion 51b with the first partition plate inner annular disk. The part 51a and the first partition plate outer annular disk part 51b are connected so as to be concentric.

  The first partition plate cylindrical portion 51d is a cylindrical shape connected to the edge of the opening of the first partition plate inner annular disk portion 51a, and has a first partition plate cone-shaped portion 51c and a first partition plate outer annular circle in the axial direction. It extends to the side opposite to the plate portion 51b. A first partition plate through hole 51f through which the rotor shaft 11 penetrates is formed on the radially inner side of the first partition plate cylindrical portion 51d. Here, the gap g (FIG. 2) between the first partition plate through hole 51f and the outer surface of the rotor shaft 11 is, for example, about several millimeters.

  The first partition plate 51 includes a first partition plate outer annular disk portion 51b, a first partition plate conical portion 51c, a first partition plate inner annular disk portion 51a, and a first partition plate cylindrical portion 51d. May be sequentially joined, or a part or the whole may be integrally formed by press working or the like. In this case, the shape corresponding to the first partition plate outer annular disk portion 51b and the first partition plate cylindrical portion 51d is maintained.

  Here, in the first partition plate 51, the side facing the rotor core 12 in the axial direction is called the front side, and the side facing the bearing bracket 45 is called the back side. In order to secure the sealing performance between the rotor core side space 41a and the bearing side space 41b, the surface on the back side of the first partition plate inner annular disk portion 51a is axially inward of the bearing inner oil drain 32, that is, The first partition plate fastener 52 attaches the rotor core 12 so as to be in close contact with the surface on the rotor core 12 side. In addition, in order to improve the sealing performance, a sealing member (not shown) such as a gasket may be further provided between the first partition plate inner annular disk portion 51a and the bearing inner oil drain 32. Good.

  FIG. 4 is an upper half longitudinal sectional view showing the second partition plate. The second partition plate 54 has a second partition plate inner annular disk portion 54a, a second partition plate cone-shaped portion 54c, and a second partition plate outer annular disk portion 54b.

  The second partition plate 54 has a configuration in which a second partition plate inner annular disk portion 54a, a second partition plate cone-shaped portion 54c, and a second partition plate outer annular disk portion 54b are sequentially connected radially outward. It is. As a result, they are gradually expanded outward in the radial direction, and are also expanded in the axial direction toward the bearing bracket 45.

  The second partition plate inner annular disk portion 54a is an annular disk in which a second partition plate opening 54f concentric with the disk is formed. The second partition plate inner annular disk portion 54a is formed in such a size as to have a portion radially overlapping with the first partition plate outer annular disk portion 51b, and the diameter of the second partition plate opening 54f is The diameter is larger than the diameter of the radially outer surface of the bearing inner oil drain 32. That is, the diameter of the second partition plate opening 54f is larger than the diameter of the radially outer surface of the bearing inner oil drain 32, and the outer diameter of the first partition plate inner annular disk portion 51a is further increased. Have been.

  Since the compressible member 53 is provided in a radially overlapping portion between the first partition plate outer annular disk portion 51b and the second partition plate inner annular disk portion 54a, the first partition plate outer annular disk portion 51b is It has the necessary outer diameter for this.

  The second partition plate outer annular disk portion 54b is an annular disk having a concentric opening formed in the disk, and the diameter of the opening is larger than the diameter of the second partition plate inner annular disk portion 54a. A plurality of fastener holes 54h through which the second divider fastener 55 penetrates are formed at intervals in the circumferential direction in the outer annular disk portion 54b of the second divider plate.

  The second partition plate conical portion 54c connects the peripheral portion of the second partition plate inner annular disk portion 54a and the edge of the opening of the second partition plate outer annular disk portion 54b to the second partition plate inner annular disk. The part 54a and the second partition plate outer annular disk part 54b are connected so as to be concentric.

  The second partition plate 54 is formed by sequentially joining each of the second partition plate inner annular disk portion 54a, the second partition plate conical portion 54c, and the second partition plate outer annular disk portion 54b. Alternatively, a part or the whole may be integrally formed by press working or the like.

  Here, in the second partition plate 54, the side on which the second partition plate inner annular disk portion 54a is provided in the axial direction is the front side, and the side on which the second partition plate outer annular disk portion 54b is provided is the axial direction. It will be called the back side.

  Although FIG. 2 shows an example in which an annular spacer 55a is provided between the outer annular disk portion 54b of the second partition plate and the inner surface of the bearing bracket 45, the annular spacer 55a may be replaced depending on conditions. It is not necessary to provide.

  That is, the back surface of the second partition plate outer annular disk portion 54b is formed to be parallel to the inner surface of the bearing bracket 45, and is brought into close contact with the inner surface of the bearing bracket 45, so that the rotor core side space 41a and the bearing If a sealing function with the side space 41b can be ensured, the second partition plate 54 may be directly attached to the bearing bracket 45 by the second partition plate fastener 55.

  In order to improve the sealing performance of the second partition plate 54, a sealing member such as a gasket (a gasket or the like) may be provided between any of the second partition plate outer annular disk portion 54 b, the annular spacer 55 a, and the bearing bracket 45. (Not shown) may be provided.

  As described above, the compressible member 53 is a circular disk having a circular opening formed concentrically at the center, which is the back side of the first partition plate outer circular disk portion 51b and the second partition plate outer circular disk. It has a plane that is substantially parallel to both surfaces on the front side of the portion 54b. The compressible member 53 is attached to either the first partition plate 51 or the second partition plate 54 at a radial position between the first partition plate 51 and the second partition plate 54.

  In the example shown in FIG. 2, one surface of the compressible member 53 is attached to the front surface of the second partition plate inner annular disk portion 54 a of the second partition plate 54. In the assembled state of the rotating electric machine 100, the compressible member 53 includes the front surface of the second partition plate inner annular disk portion 54 a of the second partition plate 54 and the first partition plate outer annular circle of the first partition plate 51. It is arranged between the rear surface of the plate portion 51b.

  The compressible member 53 may be made of a uniform material such as sponge rubber, neoprene rubber, or the like, and formed into an annular shape. When an elastic material such as sponge rubber or neoprene rubber is used as the compressible member 53, there is a merit that a gap at a joint can be prevented from being caused by a casting error, a cutting error, or an assembly error.

  Each of the first partition plate outer annular disk portion 51b and the second partition plate inner annular disk portion 54a has a shape that spreads out in a plane, but if it is a shape that can be in close contact with each other, for example, it has a partial weight shape. There may be.

  In addition, without providing the compressible member 53, by making either the 1st partition plate 51 or the 2nd partition plate 54 or both into shape and material low rigidity, it has flexibility in an axial direction. To secure the same effect.

  FIG. 5 is a flowchart showing an assembling procedure of the rotating electric machine according to the first embodiment.

  First, the stator 20 is assembled (step S01). Specifically, the stator core 21 is housed in the frame 40, and then the conductor of the stator winding 22 is housed in a slot formed in the stator core 21, and the conductor outside the stator core 21 in the axial direction is provided. Wiring, wiring, etc.

  Next, with the rotor core 12 attached to the rotor shaft 11, the rotor core 12 is inserted into the stator 20 (step S02). More specifically, a conductor bar 13 is attached to a rotor core 12 attached to a rotor shaft 11, and a short-circuit ring 14 is attached to the conductor bar 13. Insert.

  Thereafter, the following procedure is performed on both sides of the rotor core 12 in the axial direction.

  In parallel with Step S01 and Step S02, the first partition plate 51 is attached to the bearing inner oil drain 32 (Step S03). More specifically, the first partition plate fastener 52 is passed through a fastener hole 51h formed in the first partition plate inner annular disk portion 51a of the first partition plate 51, and the first partition plate fastener 52, for example, a bolt is inserted into the bearing inner oil. Screw it into the screw hole formed in the cut 32 and tighten it.

  Step S03 may be before or after steps S01 and S02 as long as it is before step S04 described later.

  Next, the bearing inner oil drain 32 to which the first partition plate 51 is attached is installed at a predetermined position on the rotor shaft 11 (Step S04). Specifically, the bearing inner oil drain 32 is fitted into the rotor shaft 11 from the end of the rotor shaft 11, moved to a predetermined position along the axial direction, and temporarily placed.

  Next, the bearing 31 is attached to the rotor shaft 11 (Step S05). Specifically, the bearing 31 and the bearing outside oil drain 33 are fitted into the rotor shaft 11 from the end of the rotor shaft 11, and are moved to a predetermined position along the axial direction and fixed. Here, the rotating part 31 a of the bearing 31 is connected to the rotor shaft 11, and the fixed part 31 c of the bearing 31 and the bearing outer oil drain 33 do not rotate with the rotor shaft 11.

  In parallel with steps S01 to S05, the second partition plate 54 is attached to the bearing bracket 45 (step S06). Specifically, the second partition plate fastener 55 passes through the fastener hole 54h formed in the second partition plate outer annular disk portion 54b of the second partition plate 54, and via the annular spacer 55a. For example, a bolt is screwed into a screw hole formed in the bearing bracket 45 and tightened.

  Step S06 may be performed at any time before step S07 described below, regardless of the order of steps S01 to S05.

  Next, the bearing bracket 45 is attached to the frame 40 (Step S07). At this time, the inside diameter of the second partition plate opening 54f formed at the center of the second partition plate 54 attached to the bearing bracket 45 is outside the bearing inner oil drain 32 already installed on the rotor shaft 11. Since the diameter is larger than the diameter, the bearing bracket 45 to which the second partition plate 54 is attached can be inserted to the connection position with the frame 40 without interfering with the bearing inner oil drain 32.

  As a result, the second partition plate 54 moves to a predetermined position near the first partition plate 51, and the compressible member 53 can be brought into a compressed state. In addition, the bearing bracket 45 fixes and supports the fixing portion 31c of the bearing 31 and the bearing outer oil drain 33 that have already been mounted on the rotor shaft 11 in step S05.

  Next, the bearing inner oil drain 32 is fixed to the bearing bracket 45 with the fixing bolt 45a (Step S08). The bearing inner oil drain 32 is temporarily placed at a predetermined position in step S04. Now, as the bearing bracket 45 is installed at a predetermined position, the screw hole 32b for the fixing bolt approaches the hole 45b for the fixing bolt. As a result, the fixing bolt 45a can be inserted and screwed into the fixing bolt screw hole 32b via the fixing bolt hole 45b. When there is a clearance between the inner surface of the bearing inner oil drain 32 and the outer surface of the rotor shaft 11, when the fixing bolt screw hole 32b and the fixing bolt hole 45b are displaced in the radial direction, Using the plurality of fixing bolt holes 45b and the plurality of fixing bolt screw holes 32b in the circumferential direction, using adjusting bolts smaller in diameter than the fixing bolt 45a, sequentially adjusting the larger diameter. Alignment for making the bearing inner oil drain 32 coaxial with the rotor shaft 11 can be performed by means such as using bolts.

  As described above, in the divided partition structure 50 according to the present embodiment, the structure that separates the rotor core side space 41a and the bearing side space 41b is separated from the first partition plate 51 and the second partition plate 54. The gap g between the radially inner side of the partition structure 50 and the outer surface of the rotor shaft 11 can be reduced without impairing the assemblability of the rotating electric machine.

  Further, the first partition plate 51 is connected to the bearing inner oil drain 32 and the second partition plate 54 is connected to the bearing bracket 45 while having a sealing function. The first partition plate 51 and the second partition plate 54 are connected to each other. Sealing performance is ensured via the compressible member 53. For this reason, in the closed space 41, the rotor core side space 41a and the bearing side space 41b communicate only through an annular space between the inner surface of the first partition plate cylindrical portion 51d and the outer surface of the rotor shaft 11. ing. Further, the width of this annulus-shaped space is sufficiently narrow as the gap g.

  In the closed space 41, the pressure in the rotor core side space 41a and the pressure in the bearing side space 41b are determined by the temperature rise of the cooling gas due to heat generation in each region and the volume of each space, but there is almost no pressure difference. However, a steady flow does not occur. It is considered that the cooling gas in the rotor core-side space 41a and the cooling gas in the bearing-side space 41b are mutually replaced by diffusion.

  Therefore, even if the cooling gas in the rotor core side space 41a is higher in temperature than the cooling gas in the bearing side space 41b, the cooling gas in the rotor core side space 41a flows into the bearing side space 41b. Thus, the rise in the temperature in the bearing-side space 41b is suppressed.

  Further, the radiation from the rotor core 12 and the stator 20 to the bearing structure 30 is also blocked by the split partition structure 50. As a result, by suppressing heat transfer from the rotor core 12 and the stator 20 to the bearing structure 30, it is possible to suppress heating of the bearing.

[Second embodiment]
FIG. 6 is a partial vertical cross-sectional view illustrating a configuration of a divided partition structure of a rotary electric machine according to a second embodiment and the periphery thereof.

  The second embodiment is a modification of the first embodiment. In the second embodiment, the first partition plate 51 has a heat insulating member 56a disposed on the front surface thereof, and the second partition plate 54 has a heat insulating member 56b disposed on the front surface thereof. Have. The other points are the same as in the first embodiment.

  In the second embodiment configured as described above, the surface of the divided partition structure 50 interposed between the rotor core side space 41a and the bearing side space 41b is covered with a heat insulating member. Heat transfer from the rotor core side space 41a to the bearing side space 41b is suppressed. As a result, heat transfer from the rotor core 12 and the stator 20 to the bearing structure 30 can be further suppressed.

[Other Embodiments]
Although the embodiment of the present invention has been described above, the embodiment is presented as an example and is not intended to limit the scope of the invention. For example, in the embodiment, the case where the divided partition structure is provided on each of the bearing structures 30 on both sides is shown as an example, but the present invention is not limited to this. The partition structure may be provided only on the side of the bearing structure 30 that requires more cooling of the bearing temperature.

  Further, in the embodiment, the horizontal rotary electric machine in which the rotor shaft 11 extends horizontally has been described as an example, but the present invention is not limited to this, and may be used for a vertical rotary electric machine.

  Furthermore, the embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. The embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 10 ... rotor, 11 ... rotor shaft, 12 ... rotor core, 13 ... conductor bar, 14 ... short circuit ring, 18 ... gap, 20 ... stator, 21 ... stator core, 22 ... stator winding, 30 ... Bearing structure, 31 ... Bearing, 31a ... Rotating part, 31b ... Rolling element, 31c ... Fixed part, 32 ... Bearing oil inside bearing, 32a ... Screw hole for first partition plate fastener, 32b ... Screw hole for fixing bolt, Reference numeral 33 denotes a bearing outside oil drain, 40 denotes a frame, 41 denotes a closed space, 41a denotes a rotor core side space, 41b denotes a bearing side space, 45 denotes a bearing bracket, 45a denotes a fixing bolt, 45b denotes a fixing bolt hole, and 50 denotes a division. Partition structure, 51: first partition plate, 51a: first partition plate inner annular disk portion, 51b: first partition plate outer annular disk portion, 51c: first partition plate conical portion, 51d: first partition Plate cylindrical part, 51f 1st partition Plate through-hole, 51h: fastener hole, 52: first partition plate fastener, 53: compressible member, 54: second partition plate, 54a: second partition plate inner annular disk portion, 54b: second partition Plate outer annular disk portion, 54c: second partition plate conical portion, 54f: second partition plate opening, 54h: fastener hole, 55: second partition plate fastener, 55a: annular spacer, 56a: heat insulating member , 56b: heat insulating member, 100: rotating electric machine

Claims (5)

A rotor having a rotor shaft extending in the axial direction and rotatably supported, and a rotor core mounted radially outside the rotor shaft,
A cylindrical stator core provided radially outside of the rotor core, and a stator having a stator winding penetrating the stator core in the axial direction;
A frame that is disposed radially outside of the stator and houses the rotor core and the stator,
The rotor shaft is supported on both sides of the rotor shaft in the axial direction with the rotor core interposed therebetween, and a bearing and an annular bearing inner oil drain disposed adjacent to the bearing and closer to the rotor core than the bearing. Two bearing structures comprising:
Two bearing brackets mounted on opposite ends of the frame to support the two bearing structures;
At least one of the two bearing structures, and at least one divided partition structure that divides a space between the stator in the axial direction;
With
The divided partition structure,
A first partition plate attached to the bearing inner oil drain and expanding in the radial direction, a radially inner side is formed with a through hole through which the rotor shaft penetrates, and a radially outer portion is formed in a ring shape,
A second partition plate attached to the bearing bracket and extending radially, and having a circular opening formed radially inward;
An annular compressible member attached to either the first partition plate or the second partition plate at a position sandwiched between the first partition plate and the second partition plate;
With
The diameter of the opening of the second partition plate is formed larger than the outer diameter of the bearing inner oil drain and smaller than the outer diameter of the first partition plate.
A rotating electric machine characterized by the above-mentioned. A rotor having a rotor shaft extending in the axial direction and rotatably supported, and a rotor core mounted radially outside the rotor shaft,
A cylindrical stator core provided radially outside of the rotor core, and a stator having a stator winding penetrating the stator core in the axial direction;
A frame that is disposed radially outside of the stator and houses the rotor core and the stator,
The rotor shaft is supported on both sides of the rotor shaft in the axial direction with the rotor core interposed therebetween, and a bearing and an annular bearing inner oil drain disposed adjacent to the bearing and closer to the rotor core than the bearing. Two bearing structures comprising:
Two bearing brackets mounted on opposite ends of the frame to support the two bearing structures;
At least one of the two bearing structures, and at least one divided partition structure that divides a space between the stator in the axial direction;
With
The divided partition structure,
A first partition plate attached to the bearing inner oil drain and expanding in the radial direction, a radially inner side is formed with a through hole through which the rotor shaft penetrates, and a radially outer portion is formed in a ring shape ,
A second partition plate attached to the bearing bracket and extending radially, and having a circular opening formed radially inward ;
With
The diameter of the opening of the second partition plate is formed larger than the outer diameter of the bearing inner oil drain and smaller than the outer diameter of the first partition plate,
The first partition plate and the second partition plate are formed such that opposing portions are in close contact with each other, and at least one of the first partition plate and the second partition plate has flexibility in the axial direction. Have,
A rotating electric machine characterized by the above-mentioned. The divided partition structure has a heat insulating member disposed on the surface thereof,
The rotating electric machine according to claim 1 or 2 , wherein: A rotor having a rotor shaft and a rotor core, a stator having a stator core and a stator winding, a frame, supporting the rotor shaft, and a bearing; adjacent to the bearing; The two bearing structures of a rotary electric machine including: two bearing structures including an annular bearing inner oil drain disposed on the rotor core side; and two bearing brackets that support the two bearing structures. A partition structure that axially divides a space between at least one of the body and the stator,
A first partition plate attached to the bearing inner oil drain and expanding in the radial direction, a radially inner side is formed with a through hole through which the rotor shaft penetrates, and a radially outer portion is formed in a ring shape,
A second partition plate attached to the bearing bracket and extending radially, and having a circular opening formed radially inward;
An annular compressible member attached to either the first partition plate or the second partition plate at a position sandwiched between the first partition plate and the second partition plate;
With
The diameter of the opening of the second partition plate is formed larger than the outer diameter of the bearing inner oil drain and smaller than the outer diameter of the first partition plate.
Split partition structure characterized in that. A rotor having a rotor shaft and a rotor core, a stator having a stator core and a stator winding, a frame, supporting the rotor shaft, and a bearing; adjacent to the bearing; The two bearing structures of a rotary electric machine including: two bearing structures including an annular bearing inner oil drain disposed on the rotor core side; and two bearing brackets that support the two bearing structures. A partition structure that axially divides a space between at least one of the body and the stator,
A first partition plate attached to the bearing inner oil drain and expanding in the radial direction, a radially inner side is formed with a through hole through which the rotor shaft penetrates, and a radially outer portion is formed in a ring shape,
A second partition plate attached to the bearing bracket and extending radially, and having a circular opening formed radially inward;
With
The diameter of the opening of the second partition plate is formed larger than the outer diameter of the bearing inner oil drain and smaller than the outer diameter of the first partition plate ,
The first partition plate and the second partition plate are formed such that opposing portions are in close contact with each other, and at least one of the first partition plate and the second partition plate has flexibility in the axial direction. Have,
A divided partition structure characterized by the above-mentioned.

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