JP5977298B2 - Fully closed rotating electrical machine - Google Patents

Description

  The present invention relates to a fully-closed rotary electric machine including an internal fan and a cooler.

  A fully-closed rotating electrical machine includes a rotor, a stator, and usually a cooler. The rotor usually has a rotor shaft that rotates about its axis and a rotor core that is provided on the outer side in the radial direction of the rotor shaft. The stator has a cylindrical stator core in which ferromagnetic steel plates are laminated in the axial direction, and a stator coil wound around a tooth portion formed on the stator core. The stator core has a magnetic path with a certain area so that magnetic flux can be effectively passed therethrough.

  Further, in the cooler provided in the sealed space for housing the rotor core and the stator, the cooling medium from the outside flows inside the heat transfer tube, and the cooling gas cooled by the cooling medium is contained in the sealed space. Flowing. A cooling gas such as air is driven by a fan attached to the rotor shaft, that is, an inner fan, and circulates in the sealed space.

  During the load operation, the copper loss mainly occurs in the stator coil, and the iron loss mainly occurs in the stator core. Thus, it is necessary to cool the stator in order to protect the stator coil and the like against heat generated by iron loss and copper loss generated in the stator.

  Conventionally, for example, by forming cooling fins (creases) on the outer periphery of the stator core, the heat radiation area is increased, and the space between the frame and the stator core is cooled by cooling air flowing in the axial direction. (Patent Document 1).

Japanese Patent Laid-Open No. 11-4554

  The stator coil is in mechanical contact with or coupled to many members, but it is necessary to maintain insulation electrically. For this reason, many insulating materials are used for the stator coil and its peripheral members.

  Insulating materials have a limitation in heat resistance depending on the materials used. On the other hand, the current density of the stator coil tends to increase as the single machine capacity of the rotating electrical machine increases in recent years. For this reason, cooling of each part of the stator including the stator coil is important.

  Accordingly, an object of the present invention is to effectively cool the stator of a fully-closed rotating electrical machine.

  In order to achieve the above-described object, a fully-closed rotating electrical machine according to the present invention includes a rotor shaft that is rotatably supported around a rotation shaft and extends in the axial direction, and is fixed to the radially outer side of the rotor shaft in the axial direction. A rotor having a rotor core extending in the direction of the rotor core, and a duct that is arranged on the radially outer side of the rotor core and that is formed of a plurality of stacking plates stacked in the axial direction to form a radial flow passage. A stator core having a plurality of laminates arranged in the axial direction, a stator having a stator coil wound around the stator core, a frame for housing the rotor core and the stator, and A cooler cover that is attached to the frame to form a sealed space together with the frame, and communicates with the frame at a cooler inlet side opening, a first cooler outlet side opening, and a second cooler outlet side opening; The cooler cover A cooler for cooling a cooling gas that cools the stator and the rotor core in the frame, and a circulation of the cooling gas attached to the rotor in the sealed space. And a fan that drives the stator iron core in the axial direction and spaced apart from each other in the circumferential direction, the first end portion being the first cooler outlet side opening and the second cooler A plurality of cooling pipes that are opened at any one of the outlet side openings and the second end portion is opened at a position where the cooling gas flow by the fan can flow out by the cooling gas flow. To do.

  According to the present invention, it is possible to effectively cool the stator of the fully-closed rotating electrical machine.

It is a longitudinal cross-sectional view which shows the fully-closed rotary electric machine which concerns on 1st Embodiment. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1. It is a longitudinal cross-sectional view which shows the fully-closed rotary electric machine which concerns on 2nd Embodiment.

  Hereinafter, a fully-closed rotating electrical machine according to an embodiment of the present invention will be described with reference to the drawings. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted.

[First Embodiment]
FIG. 1 is a longitudinal sectional view showing a fully-closed rotating electrical machine according to the first embodiment. 2 is a cross-sectional view taken along the line II-II in FIG.

  The fully-closed rotating electrical machine 100 includes a rotor 10, a stator 20, two bearings 36, and a cooler 41. The rotor 10 includes a rotor shaft 11 and a rotor core 12 provided in the radial direction of the rotor shaft 11. The rotor shaft 11 is rotatably supported on both sides and extends horizontally in the axial direction. The rotor core 12 has a laminated structure in which disk-shaped steel plates made of a ferromagnetic material and having an opening at the center are laminated in the axial direction. Fans 15 a and 15 b are attached to the rotor shaft 11.

  The stator 20 has a cylindrical shape that is provided on the radially outer side of the rotor 10 and extends in the axial direction. The stator 20 has a stator core 21 and a stator coil 22. The stator core 21 has a laminated structure in which disk-shaped steel plates made of a ferromagnetic material and having an opening at the center are laminated in the axial direction. The laminated structure has a gap between each other in the axial direction by a spacer (not shown) to form a stator duct 23. The stator duct 23 serves as a flow path for cooling gas to flow out radially from the inside of the stator 20 over the entire circumference. In addition, although the case where only one stator duct 23 is provided is shown in FIG. 1, the present invention is not limited to this, and a plurality of stator ducts 23 may be provided in the axial direction.

  Slots (not shown) extending in the axial direction are formed in the stator core 21 facing the radially outer side of the rotor core 12 and spaced apart from each other in the circumferential direction. A stator coil 22 is provided in each slot and on both outer sides of the stator core 21 in the axial direction.

  The two bearings 36 rotatably support both axial sides of the rotor shaft 11 with the rotor core 12 interposed therebetween. Each bearing 36 is, for example, a rolling bearing. Each of the bearings 36 is fixedly supported by the bearing bracket 35.

  The rotor core 12 and the stator 20 are accommodated in a space formed by the frame 30 and the bearing brackets 35 on both sides. A cooler cover 42 is provided on the upper portion of the frame 30. The cooler cover 42 accommodates the cooler 41.

  The frame 30, together with the cooler cover 42, forms a sealed space 45. The frame 30 and the cooler cover 42 communicate with each other through a cooler inlet side opening 31, a first cooler outlet side opening 32a, and a second cooler outlet side opening 32b. A partition plate 37 is provided on the frame 30. The partition plate 37 has a plate shape in which a circular opening is formed, and is attached to both end portions of the stator core 21 in the axial direction. The atmosphere outside the radial direction of the stator core 21 and the atmosphere outside the axial direction are separated by a partition plate 37.

  A plurality of cooling pipes 51 a and 51 b are provided in the stator core 21. The plurality of cooling pipes 51 a and 51 b are arranged at intervals in the circumferential direction, and each penetrates the stator core 21 in the axial direction. Both ends of the cooling pipe 51 a extend outward in the axial direction of the stator core 21. The first end of the cooling pipe 51a opens at the cooling pipe inlet opening 52a at the position of the first cooler outlet side opening 32a. The cooling pipe inlet opening 52a is formed so that its cross section becomes wider toward the end. The second end of the cooling pipe 51a is a cooling pipe outlet opening 53a at a position near the suction port of the fan 15b provided on the opposite side of the cooling pipe inlet opening 52a with the stator core 21 in between. It is open.

  Similarly, both ends of the cooling pipe 51 b extend outward in the axial direction of the stator core 21. The first end of the cooling pipe 51b opens at the cooling pipe inlet opening 52b at the position of the second cooler outlet side opening 32b. The cooling pipe inlet opening 52b is formed so that its cross section becomes wider toward the end. The second end of the cooling pipe 51b is a cooling pipe outlet opening 53b at a position near the suction opening of the fan 15a provided on the opposite side of the cooling pipe inlet opening 52b with the stator core 21 in between. It is open.

  Further, as shown in FIG. 2, the cooling pipe 51a and the cooling pipe 51b are arranged in the stator core 21 such that the cooling pipe 51a and the cooling pipe 51b are alternately arranged in the circumferential direction. Further, after the cooling pipe 51 a penetrates the stator core 21, the portion extending to the suction side of the fan 15 b is directed in the direction of the rotation axis of the rotor shaft 11. The same applies to the cooling pipe 51b although not shown. Note that the arrangement of the cooling pipe 51a and the cooling pipe 51b outside the stator core 21 is not limited to this, and may be determined in consideration of surrounding conditions, support conditions, and the like.

  Next, the operation of the fully-closed rotating electrical machine 100 according to this embodiment will be described. A cooling gas such as air in the sealed space 45 circulates in the sealed space 45 as the fans 15a and 15b rotate. The cooling gas in the sealed space 45 is driven in the direction of the rotor core 12 and the stator 20 by the fans 15a and 15b.

  The driven cooling gas flows into the gap portion 25 formed between the rotor core 12 and the stator core 21 from both sides, flows in the gap portion 25 toward the center in the axial direction, and then the stator duct. 23 to the outside in the radial direction. Alternatively, when the rotor core 12 has a flow path (not shown), a part of the driven cooling gas flows out of the stator duct 23 radially outward after passing through this flow path.

  The cooling gas flowing out of the stator duct 23 flows out into the space A surrounded by the partition plates 37 and the frame 30 on both sides. The cooling gas flowing out into the space A flows into the cooler 41 in the cooler cover 42 via the cooler inlet side opening 31. The cooling gas that has flowed into the cooler 41 is cooled, then flows out of the cooler 41, is divided into two directions, and flows into the two spaces B1 and B2 divided by the cooler 41 within the cooler cover 42. .

  The cooling gas that has flowed into the space B1 flows into the space C1 in the axially outer side of the partition plate 37 in the frame 30 via the first cooler outlet side opening 32a. The cooling gas flowing into the space C1 is sucked into the fan 15a. Similarly, the cooling gas flowing into the space B2 flows into the space C2 on the axially outer side of the partition plate 37 in the frame 30 via the second cooler outlet side opening 32b. The cooling gas flowing into the space C2 is sucked into the fan 15b.

  The above is the main flow of the cooling gas in the sealed space 45. As a result of this flow, a pressure gradient is generated in the sealed space 45. The pressure in the sealed space 45 is highest at the outlets of the fan 15a and the fan 15b. In the space A, the pressure is reduced by the pressure loss in the stator core 21 and the like. Further, in the space B1 and the space B2 after passing through the cooler 41, the pressure loss in the cooler 41 further decreases. Furthermore, as a result of flowing to the fan 15a and the fan 15b, the suction port of the fan 15a and the fan 15b has the lowest pressure.

  Here, the cooling pipe 51a and the cooling pipe 51b are flow paths parallel to a part of the flow path of the main flow described above. Comparing the pressure at each of the cooling pipe inlet opening 52a and the cooling pipe outlet opening 53a of the cooling pipe 51a, as described above, the pressure at the cooling pipe inlet opening 52a is more than the pressure at the cooling pipe outlet opening 53a. high. Therefore, in the cooling pipe 51a, the cooling gas flows from the cooling pipe inlet opening 52a toward the cooling pipe outlet opening 53a.

  Similarly, when the pressure in each of the cooling pipe inlet opening 52b and the cooling pipe outlet opening 53b of the cooling pipe 51b is compared, as described above, the pressure in the cooling pipe inlet opening 52b is the cooling pipe outlet opening 53b. Higher than the pressure at. Accordingly, in the cooling pipe 51b, the cooling gas flows from the cooling pipe inlet opening 52b toward the cooling pipe outlet opening 53b.

  As described above, in the state where the rotor 10 is rotating, the fan 15a and the fan 15b rotate, and the cooling gas flows through the cooling pipe 51a and the cooling pipe 51b which are parallel flow paths with a part of the main flow path. The cooling effect of the stator core 21 is improved.

  Further, since the cooling pipes 51a and the cooling pipes 51b are alternately arranged in the circumferential direction in the stator core 21, the cooling gas in the stator core 21 flows in directions opposite to each other in the axial direction. Therefore, the occurrence of imbalance in the temperature distribution in the axial direction due to the flow of the cooling gas through the stator core 21 can be suppressed.

  As described above, according to the present embodiment, the stator 20 of the fully-closed rotating electrical machine 100 can be effectively cooled.

[Second Embodiment]
FIG. 3 is a longitudinal sectional view showing a fully-closed rotating electrical machine according to the second embodiment. This embodiment is a modification of the first embodiment. In the present embodiment, the positions of the cooling pipe outlet opening 54a and the cooling pipe outlet opening 54b, which are the second ends of the cooling pipes 51a and 51b, are on the discharge side of the fan 15a and the fan 15b, respectively. The direction of the opening of the cooling pipe outlet opening 54a and the cooling pipe outlet opening 54b is the same as the direction from the upstream to the downstream of the fans 15a and 15b.

  On the discharge side of the fans 15a and 15b, the flow velocity of the cooling gas is high. If the openings of the cooling pipe outlet opening 54a and the cooling pipe outlet opening 54b exist at this location toward the downstream side, the pressure of the cooling pipe outlet opening 54a and the cooling pipe outlet opening 54b is caused by the suction action by the flow of the outer fluid. Decreases. As a result, the pressure of the cooling pipe outlet opening 54a becomes lower than the pressure of the cooling pipe inlet opening 52a, and the cooling gas flows in the cooling pipe 51a. Similarly, the pressure in the cooling pipe outlet opening 54b becomes lower than the pressure in the cooling pipe inlet opening 52b, and the cooling gas flows in the cooling pipe 51b.

  This embodiment is effective when the flow velocity on the discharge side of the fans 15a and 15b is large and the suction action is large.

[Other Embodiments]
As mentioned above, although embodiment of this invention was described, embodiment is shown as an example and is not intending limiting the range of invention. The embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. The embodiments and the modifications thereof are included in the scope of the invention and the scope 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, 15a, 15b ... Fan, 20 ... Stator, 21 ... Stator core, 22 ... Stator coil, 23 ... Stator duct, 25 ... Gap part, DESCRIPTION OF SYMBOLS 30 ... Frame, 31 ... Cooler inlet side opening, 32a ... First cooler outlet side opening, 32b ... Second cooler outlet side opening, 35 ... Bearing bracket, 36 ... Bearing, 37 ... Partition plate, 41 ... Cooler, 42 ... Cooler cover, 45 ... Sealed space, 51a, 51b ... Cooling pipe, 52a, 52b ... Cooling pipe inlet opening, 53a, 53b, 54a, 54b ... Cooling pipe outlet opening, 100 ... Fully closed rotation Electric

Claims (5)

A rotor shaft rotatably supported around the rotation shaft and extending in the axial direction; and a rotor core fixed to the radially outer side of the rotor shaft and extending in the axial direction;
A stator having a plurality of laminated bodies arranged in the axial direction across a duct formed of a plurality of laminating plates laminated in the axial direction and arranged in the radial direction of the rotor core, and forming a radial flow passage. A stator having an iron core and a stator coil wound around the stator iron core;
A frame for housing the rotor core and the stator;
A cooler cover that is attached to the frame and forms a sealed space together with the frame, and communicates with the frame through a cooler inlet side opening, a first cooler outlet side opening, and a second cooler outlet side opening; ,
A cooler that is provided in the cooler cover and cools a cooling gas that cools the stator and the rotor core in the frame;
A fan attached to the rotor for driving circulation of the cooling gas in the sealed space;
The stator core is passed through the stator core in the axial direction and spaced apart from each other in the circumferential direction, and the first end is one of the first cooler outlet side opening and the second cooler outlet side opening. On the other hand, a plurality of cooling pipes that open at a position where the second end portion can flow out the cooling gas inside by the cooling gas flow by the fan, and
A fully-closed rotary electric machine comprising:   The fully closed rotating electrical machine according to claim 1, wherein the second end portion is opened on the suction side of the fan as the position allowing the outflow.   2. The fully closed rotation according to claim 1, wherein the second end portion is opened at the discharge side of the fan where a suction force is generated by a surrounding cooling gas flow as the position capable of flowing out. Electric.   Among the plurality of cooling pipes, the cooling pipe in which the first end portion opens at the first cooler outlet side opening, the first end portion opens at the second cooler outlet side opening. The fully-closed rotary electric machine according to any one of claims 1 to 3, wherein the fully-rotating electric machine is adjacent to at least one of the cooling pipes in a circumferential direction.   The fully closed rotating electrical machine according to any one of claims 1 to 4, wherein the first end portion has a suction portion formed so that an opening area increases toward the inlet. .

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