JP5931809B2 - Rotating electrical machine - Google Patents

Description

  The present invention relates to a rotating electric machine such as an electric motor or a generator.

  A rotary electric machine such as a generator has a structure in which a stator and a rotor that is rotatably provided in an opening portion of the stator are housed in a casing. In such a rotating electric machine, in order to cool each component inside the casing, a stirring fan is provided in the rotor, and this is rotated together with the rotor to stir the air in the casing. There is also known a rotary electric machine in which a partition plate is provided between a coil end of a stator and a casing inner surface facing the coil end. The air in the casing which has been stirred by the stirring fan and passed through the coil end of the stator winding is guided between the partition plate and the inner wall surface of the casing.

  Furthermore, in addition to the above-described fixed-side partition plate, a rotary electric machine is also known in which a partition plate is provided at an axial end portion of the rotor. By providing a partition plate not only on the coil end side but also on the rotor side, it is possible to prevent the cooling air from circulating in a short circuit only around the stirring fan, so the amount of cooling air that passes through the coil end side Is secured.

Japanese Utility Model Publication No. 42-18964 JP 2007-135306 A

  However, the structure of the conventional rotating electric machine described above merely secures a cooling air circulation path by providing a partition plate facing the coil end and the rotor. For this reason, especially when the casing has a hermetically sealed structure, it is effective to stir the air inside the casing with the stirring fan and cool the stirred air with the small cooling fins integrally formed at the end of the core ring. However, the stator core and the stator winding that are in a high temperature state cannot be sufficiently cooled. In addition, a cooling device can be separately provided in the casing, but there are problems such as an increase in device size and manufacturing cost.

  Therefore, an object of the present invention is to provide a rotating electric machine that can efficiently cool the air in the casing without increasing the device size.

  A rotating electric machine according to an embodiment of the present invention includes a sealed casing, a rotating shaft rotatably supported by the casing via a bearing, and a concentric arrangement with respect to the rotating shaft. A ring-shaped core ring whose surface side is fixed to the inner wall surface of the casing, and a first cooling water channel provided so that cooling water flows in the axial direction of the rotary shaft in the thick part of the core ring; The water chamber is provided at the end of the first cooling water channel and stores the cooling water, the end cooling fin formed integrally with the outside of the water chamber, and the rotation shaft. A ring-shaped stator having a ring-shaped stator core and a stator winding wound around the ring-shaped stator core, the ring-shaped stator being fixed to the inner peripheral surface of the core ring, and the rotating shaft on the inner side of the stator Fixed and rotatable with the rotary shaft An agitating fan fixed to the axial end of the rotor and stirring the air in the casing as the rotor rotates, and connected to the water chamber via a water pipe; A first partition plate that has a second cooling water channel through which the supplied cooling water flows, and that is provided to face the axial end surfaces of the stator and the core ring; A plurality of partition plate cooling fins arranged radially with respect to the rotation axis on a surface of the partition plate facing the inner wall surface of the casing.

  ADVANTAGE OF THE INVENTION According to this invention, the air in a casing can be efficiently cooled with the cooling fin extendedly formed on the circulation path of air, without increasing an apparatus size.

Sectional drawing which shows the internal structure of the rotary electric machine which concerns on the 1st Embodiment of this invention. The front view which looked at the rotary electric machine shown in FIG. 1 from the center side of the rotating shaft. Sectional drawing which shows the internal structure of the rotary electric machine which concerns on the 2nd Embodiment of this invention. Sectional drawing which shows the internal structure of the rotary electric machine which concerns on the 3rd Embodiment of this invention. Sectional drawing which shows the internal structure of the rotary electric machine which concerns on the 4th Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<First Embodiment>
FIG. 1 is a cross-sectional view showing the internal structure of a rotating electric machine 10 according to the first embodiment of the present invention. Here, since the upper and lower structures of the rotating electrical machine 10 are common, only the upper half is shown. FIG. 2 is a front view of the rotating electrical machine 10 shown in FIG. 1 as viewed from the center side of the rotating shaft 12. As shown in these drawings, in the rotary electric machine 10, a rotary shaft 12 is rotatably supported via a bearing 13 in a casing 11 having a sealed structure.

  The core ring 14 is formed in a ring shape, is disposed concentrically with the rotating shaft 12, and an outer peripheral surface side thereof is fixed to the inner wall surface of the casing 11. A thick cooling portion of the core ring 14 is provided with a first cooling water channel 141 through which cooling water flows in the axial direction of the rotating shaft 12 (left-right direction in FIG. 1). In addition, a water chamber 142 for storing cooling water is provided at the end of the first cooling water channel 141. Furthermore, an end cooling fin 143 is integrally formed outside the water chamber 142.

  The stator 15 includes a ring-shaped stator iron core 151 concentrically formed with the rotary shaft 12 and a stator winding 152 wound around the ring-shaped iron core. It is fixed to the inner peripheral surface. Coil ends 153 that are ends of the stator winding 152 protrude from both ends of the stator core 151.

  The rotor 16 has a disc-shaped rib 161, is fixed to the outer peripheral portion of the rotating shaft 12 inside the ring-shaped stator 15 via the rib 161, and can be rotated together with the rotating shaft 12.

  The permanent magnet 17 is fixed to the rotor 16 on one surface, and the opposite surface is opposed to the inner peripheral surface of the ring-shaped stator 15 with a predetermined distance.

  As shown in FIG. 1, the stirring fan 18 is fixed to the left and right ends of the rotor 16, and stirs the air in the casing 11 as the rotor 16 rotates.

  The first partition plate 19 is connected to the water chamber 142 via a water distribution pipe 191 and has a second cooling water channel 192 through which cooling water supplied from the water chamber 142 flows. The first partition plate 19 is formed to extend in the rotational radius direction (vertical direction in FIG. 1) of the rotor 16 so as to face the left and right end faces of the stator 15 and the core ring 14, respectively. In order to increase the cooling efficiency of the air circulating inside, the first partition plate 19 has an upper end position above the position of the water chamber 142 (distant from the rotating shaft 12) as shown in FIG. And the length of the lower end portion is preferably lower than the position of the end portion of the coil end 153 (closer to the rotating shaft 12). The first partition plate 19 guides the air that has been stirred by the stirring fan 18 and cooled by passing through the coil end 153 and the end cooling fins 143 to the space between the inner wall surface of the casing 11. The cooling water circulated in the second cooling water channel 192 is returned again to the water chamber 142 via the water distribution pipe 191.

  As shown in FIG. 1, the partition plate cooling fins 20 are formed to extend in the vertical direction on the surface of the first partition plate 19 so as to face the inner wall surface of the casing 11. Further, as shown in FIG. 2, the plurality of partition plate cooling fins 20 are arranged radially with respect to the rotary shaft 12 on the surface of the ring-shaped first partition plate 19. In the present embodiment, a plurality of thin metal plates are arranged radially as the partition plate cooling fins 20 so that the air flowing in the casing 11 is not hindered and heat exchange with the air is sufficiently performed. . The partition plate cooling fins 20 can further cool the air guided to the space between the first partition plate 19 and the inner wall surface of the casing 11. Moreover, although the rotary electric machine 10 of this embodiment is a permanent magnet type electric motor, it is shown as an example of the rotary electric machine, and may be another type of rotary electric machine that does not have the permanent magnet 17. .

  Hereinafter, the operation of the rotating electrical machine 10 configured as described above will be described. When the rotary electric machine 10 is operated and the rotor 16 rotates around the rotation shaft 12, the stirring fan 18 provided at the end of the rotor 16 also rotates to stir the air in the casing 11. The air stirred by the stirring fan 18 is guided upward by a first partition plate 19 extending in the vertical direction as shown in FIG. Next, the air passes through the periphery of the coil end 153 and the end cooling fin 143 of the stator winding 152, and rises while being cooled. Thereafter, as indicated by the cooled broken line arrow A, the U-turn is made at the upper surface portion in the casing 11, flows between the inner wall surface of the casing 11, and descends. The air descending along the first partition plate 19 and the inner wall surface of the casing 11 is further cooled by the first partition plate 19 and the partition plate cooling fins 20 formed on the first partition plate 19, and the rotating shaft 12. And it moves to the stirring fan 18 direction, and forms a circulation flow.

  As described above, according to the rotary electric machine 10 according to the present embodiment, the first partition plate 19 and the partition plate cooling fin 20 are arranged on the air circulation path in the casing 11, and thus the circulating air is It is possible to cool efficiently with a larger surface area than before. Further, since the first partition plate 19 is connected to the water chamber 142 of the existing core ring 14 via the water distribution pipe 191, it is necessary to install an additional cooling facility inside the rotary electric machine 10. Absent. That is, the cooling effect can be enhanced without increasing the size of the rotating electrical machine 10. Further, since a sufficient space can be secured around the main components such as the stator 15 and the rotor 16, the degree of freedom in design is high. Furthermore, since the first partition plate 19 is a separate part that is not integral with the main part, there is an advantage that it is easy to replace and easy to maintain.

<Second Embodiment>
FIG. 3 is a cross-sectional view showing the internal structure of the rotating electric machine 10 according to the second embodiment of the present invention. As shown in the figure, the rotary electric machine 10 according to the present embodiment includes a second partition plate in which the end of the first partition plate 19 on the rotating shaft 12 side (lower end in FIG. 3) and the plate surface are continuous. The difference from the first embodiment is that 21 is further provided. The second partition plate 21 has a plate surface continuous with the first partition plate 19, facing the inner wall surface of the casing 11, from the end on the first partition plate 19 side in the rotational radius direction of the rotor 16 ( A first plate surface extended in the vertical direction in FIG. 3 and a direction substantially perpendicular to the first plate surface from the end of the first plate surface to the vicinity of the stirring fan 18 (left and right in FIG. 3). A second plate surface extending in the direction).

  In the above configuration, when the rotary electric machine 10 is operated and the rotor 16 rotates about the rotary shaft 12, the stirring fan 18 provided at the end of the rotor 16 also rotates to stir the air in the casing 11. To do. The air in the casing 11 stirred by the stirring fan 18 is guided by the first partition plate 19 as shown by the broken line arrow A, and rises while cooling the coil end 153 of the stator winding 152. By cooling the coil end 153, the temperature of the air rises, but after that, it is cooled by exchanging heat with the end cooling fins 143 formed integrally with the end of the water chamber 142.

  Next, the air passing through the end cooling fins 143 makes a U-turn at the upper surface portion in the casing 11, flows between the first partition plate 19 and the inner wall surface of the casing 11, and descends. The lowered air is guided in the vertical direction and the horizontal direction by the second partition plate 21 and flows into the space between the outer periphery of the rotating shaft 12 and the stirring fan 18, and the stirring fan 18 again causes the coil end 153 and the end. Ascending toward the partial cooling fin 143, a circulating flow in the casing 11 is formed.

  That is, in addition to the first partition plate 19 provided in the vicinity of the coil end 153 of the stator 15, the second partition plate 21 is provided to face the stirring fans 18 provided at the left and right ends of the rotor 16. Thus, the cooling air can be prevented from being circulated in a short circuit only around the stirring and stirring fan 18. Accordingly, a sufficient amount of cooling air passing through the coil end 153 portion is ensured, so that the cooling efficiency is further improved.

  In addition, the second partition plate 21 is separated from the first partition plate 19 and is not attached to face the end of the rotor 16, but is fixed to the end of the first partition plate 19, It is easier to assemble and fine-tune than conventional structures.

<Third Embodiment>
FIG. 4 is a cross-sectional view showing the internal structure of the rotating electrical machine 10 according to the third embodiment of the present invention. The rotating electrical machine 10 according to the present embodiment includes a stator 15, a rotor 16, a first partition plate 19, and a second partition plate 21 that have basically the same structure as that of the second embodiment described above. Unlike the second embodiment, outer peripheral cooling fins 144 are provided on the outer peripheral surface of the core ring 14 in the axial direction of the rotary shaft 12. Between this outer peripheral side cooling fin 144 and the inner wall surface of the casing 11 which opposes this, the cooling path which connects the one end side (right side of FIG. 4) and the other end side (left side of FIG. 4) in the casing 11 Is formed.

  Unlike the second embodiment, the disc-shaped rib 161 for attaching the rotor 16 to the outer periphery of the rotating shaft 12 is provided with a ventilation portion 162 penetrating in the axial direction of the rotating shaft 12.

  The functions of the first partition plate 19 and the second partition plate 21 arranged on one end side of the stator 15 and the rotor 16 are the same as the functions described in the second embodiment. That is, on one end side, the first partition plate 19 causes the air in the casing 11 stirred by the stirring fan 18 to rotate with the coil end 153 of the stator winding 152 and the water chamber 142 as the rotor 16 rotates. Guidance is provided between the inner wall surface of the casing 11 via the integral end cooling fins 143 as indicated by a broken line arrow A. In addition, on one end side, the second partition plate 21 causes the air guided between the inner surface of the casing 11 by the first partition plate 19 to the space between the outer periphery of the rotating shaft 12 and the stirring fan 18. Guide and form a circulating flow in the casing 11.

  Further, on the one end side, the second partition plate 21 allows the air guided downward between the first partition plate 19 and the inner surface of the casing 11 to pass through one end opening of the ventilation portion 221 (the central right side in FIG. 4). Guide to the opening).

  On the other hand, the second partition plate 21 arranged on the other end side of the stator 15 and the rotor 16 has the air flowing from the right end side through the ventilation portion 162, that is, the other end opening of the ventilation portion 162. The air in the section (the central left opening in FIG. 4) is guided to the stirring fan 18 provided on the other end side of the rotor 16. The first partition plate 19 arranged on the other end side guides the air in the casing 11 stirred by the stirring fan 18 to the coil end 153 and the end cooling fins 143 of the stator winding 152.

  Unlike the second embodiment, a third partition plate 22 is further provided on the other end side between the first partition plate 19 and the inner wall surface of the casing 11. The third partition plate 22 is configured so that the air that has flowed to the coil end 153 and the end cooling fin 143 on the other end side by the first partition plate 19, as indicated by the broken arrow B, is the outer periphery of the core ring 14. The outer peripheral cooling fins 144 provided on the surface and the inner wall surface of the casing 11 are directed to a cooling passage that connects one end side and the other end side in the casing 11 to each other.

  In the above configuration, with the operation of the rotating electrical machine 10, the rotor 16 rotates about the rotating shaft 12, and the stirring fan 18 integrated therewith also rotates. The air in the casing 11 stirred by the stirring fan 18 is guided and raised by the first partition plate 19 and the second partition plate 21 provided on both sides of the stator 15 and the rotor 16, and the stator. The coil ends 153 protruding from both ends of the iron core 151 are cooled. Although the temperature of air rises by cooling the coil end 153, it is cooled by exchanging heat with the end cooling fins 143 arranged on the downstream side of the air circulation path.

  Next, on the right end side in the casing 11, the air that has passed through the end cooling fins 143 makes a U-turn at the upper surface portion in the casing 11, as indicated by the dashed arrow A, and between the inner wall surface of the casing 11. Guided and descended. On the other hand, on the left end side in the casing 11, the air that has passed through the end cooling fins 143 is prevented from flowing downward to the left by the third partition plate 22, and therefore, as shown by the broken line arrow B, It flows between the outer peripheral cooling fins 144 provided on the outer peripheral surface of the core ring 14 and the inner wall surface of the casing 11. In other words, the air that has flowed through the cooling passage that connects the one end side and the other end side in the casing 11 is cooled by heat exchange with the outer peripheral side cooling fins 144. In addition, since the cable 23 connected to the stator winding 152 is usually installed in the cooling passage, the cable 23 is also cooled.

  The air that has reached the right side in the casing 11 through the cooling passage is guided and lowered between the first partition plate 19 and the inner wall surface of the casing 11 together with the air flow indicated by the dashed arrow A. The lowered air is guided by the second partition plate 21 and flows into a space between the outer periphery of the rotating shaft 12 and the inner periphery of the iron core of the rotor 16. A part of the air rises again toward the coil end 153 and the end cooling fins 143 by the right stirring fan 18. Further, the remaining air flows to the left side of the rotor 16 through the ventilation portion 162 that penetrates the disc-shaped rib 161 in the axial direction.

  The air flowing to the left end side of the rotor 16 is guided by the second partition plate 21 to the stirring fan 18 provided on the left end side of the rotor 16. Then, it is stirred by the stirring fan 18 and rises again toward the coil end 153 and the end cooling fin 143. Although the temperature of air rises by cooling the coil end 153, it is cooled by exchanging heat with the end cooling fins 143.

  As described above, according to the rotating electrical machine 10 according to the present embodiment, the water chamber 142 is incorporated by partitioning one side (the left side in the drawing) of the two flow paths for cooling the coil ends 153 at both ends. Since air can also flow through the outer peripheral cooling fins 144 provided on the back surface of the child ring 14, not only the coil ends 153 provided at both ends but also the entire stator 15 can be efficiently cooled.

<Fourth Embodiment>
FIG. 5 is a cross-sectional view showing the internal structure of the rotating electric machine 10 according to the fourth embodiment of the present invention. The rotary electric machine 10 according to the present embodiment includes a stator 15, a rotor 16, a first partition plate 19, and a second partition plate 21 that have basically the same structure as that of the second embodiment described above. . The difference from the second embodiment is that an air hole 24 is provided across the rotor 16 and the permanent magnet 17 so as to communicate with the gap with the inner peripheral surface of the stator 15. The air hole 24 captures air between the inner peripheral surface of the rotor 16 and the outer periphery of the rotary shaft 12 and guides it to the gap between the permanent magnet 17 and the inner peripheral surface of the stator 15. Further, guide vanes 25 are provided at the inlet portion of the air hole 24 so that air can be captured efficiently.

  In the above configuration, with the operation of the rotating electrical machine 10, the rotor 16 rotates about the rotating shaft 12, and the stirring fan 18 integrated therewith also rotates. The air in the casing 11 stirred by the stirring fan 18 rises while being guided by the first partition plate 19 as indicated by the broken arrow A, and cools the coil ends 153 exposed at both ends of the stator core 151. To do.

  Next, the air that has passed through the coil end 153 makes a U-turn at the upper surface portion in the casing 11, is guided between the inner wall surface of the casing 11, and descends. Here, as in the second embodiment, the second partition plate 21 guides the air descending between the outer surface of the first partition plate 19 and the inner wall surface of the casing 11 to the vicinity of the stirring fan 18. At the same time, it is guided between the outer periphery of the rotating shaft 12 and the inner periphery of the iron core of the rotor 16.

  And the air guided between the outer periphery of the rotating shaft 12 and the iron core inner periphery of the rotor 16 is caught by the air hole 24 provided in the rotor 16 from the guide blade 25 by the rotation of the rotor 16. As indicated by the broken line arrow C, the coil flows to the coil end 153 through a gap with the inner periphery of the stator 15 and is cooled. Although the temperature of air rises by cooling the coil end 153, it is cooled by exchanging heat with the end cooling fins 143 arranged on the downstream side of the air circulation path.

  Therefore, according to the rotating electrical machine 10 according to the present embodiment, the amount of air flowing through the coil end 153 and the end cooling fin 143 is added to the flow of the air of the broken line arrow C in addition to the flow of the broken line arrow A. Become. For this reason, the air around the stator 15 that is difficult to stir can be stirred, and the stator 15 can be cooled more efficiently.

  As mentioned above, although several embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel 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. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

10 ... rotating electric machine,
11 ... casing,
12 ... rotating shaft,
13 ... Bearing,
14 ... Core ring,
141. First cooling water channel,
142 ... Water chamber,
143 ... end cooling fins,
144 ... outer peripheral side cooling fins,
15 ... Stator,
151: Stator core,
152 ... Stator winding,
153 ... Coil end,
16 ... rotor,
161 ... ribs,
162 ... the ventilation part,
17 ... Permanent magnet,
18 ... Agitating fan,
19 ... 1st partition plate,
191 ... Water pipes,
192 ... second cooling channel,
20 ... partition plate cooling fin,
21 ... Second partition plate,
22 ... Third partition plate,
221: Ventilation part,
23 ... Cable,
24 ... Air holes,
25 ... Guide feathers.

Claims (5)

A sealed casing;
A rotating shaft rotatably supported by a bearing via a bearing;
A ring-shaped core ring that is arranged concentrically with respect to the rotating shaft and whose outer peripheral surface side is fixed to the inner wall surface of the casing;
A first cooling water channel provided so that cooling water flows in the axial direction of the rotary shaft in the thick part of the core ring;
A water chamber provided at an end of the first cooling water channel and storing the cooling water;
An end cooling fin integrally formed on the outside of the water chamber;
A ring-shaped stator core provided concentrically with the rotating shaft and a stator winding wound around the ring-shaped stator core; and a ring-shaped stator fixed to an inner peripheral surface of the core ring;
A rotor fixed to the rotary shaft inside the stator and rotatable together with the rotary shaft;
An agitation fan fixed to the axial end of the rotor and agitating the air in the casing as the rotor rotates;
Connected to the water chamber via a water distribution pipe, and has a second cooling water channel through which the cooling water supplied from the water chamber flows, and faces the axial end surfaces of the stator and the core ring A first partition plate provided as a
A plurality of partition plate cooling fins arranged radially with respect to the rotation axis on a surface of the first partition plate facing the inner wall surface of the casing;
A rotating electric machine comprising:   In the first partition plate, the position of the outer end of the rotor in the radial direction of rotation is farther from the rotation shaft than the position of the water chamber, and the position of the inner end is the end of the coil end. The rotary electric machine according to claim 1, wherein the rotary electric machine has a length closer to the rotation shaft than a position of the portion.   The first partition plate is formed by extending the first partition plate and the plate surface and extending from the end on the first partition plate side in the radial direction of the rotor so as to face the inner wall surface of the casing. And a second partition plate extending from the end of the first plate surface to the vicinity of the agitation fan in the axial direction of the rotation shaft. The rotating electric machine according to claim 1 or 2. The rotor has a ventilation portion penetrating in the axial direction, and the water chambers are provided at both end portions of the core ring, and the first partition plate, the partition plate cooling fin, and the second The partition plates are provided on both sides of the stator and the rotor, respectively.
An outer peripheral side cooling fin fixed in the axial direction on the outer peripheral surface of the core ring;
A third partition plate extending from an outer end of the first radial partition plate in the radial direction to the inner wall surface of the casing;
The rotating electric machine according to claim 3, further comprising: One end surface is fixed on the outer peripheral surface of the rotor, and the opposite surface further includes a permanent magnet disposed opposite to the inner peripheral surface of the stator by a predetermined distance,
The said rotor and the said permanent magnet each have an air hole which leads to the said clearance gap with the internal peripheral surface of the said stator core from the said rotating shaft side, Each of Claim 1 thru | or 4 characterized by the above-mentioned. The rotating electrical machine described.

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