JP4864492B2 - Rotating machine cooling structure - Google Patents

Description

  The present invention relates to a cooling structure for a rotating machine that rotates at a high speed.

  2. Description of the Related Art Conventionally, in a relatively low-speed rotating machine, there is a rotating machine in which a rotor is provided with a ventilation slot such as a hole or a groove, and a stator core is divided in the axial direction of the rotating shaft of the rotor. In this case, the rotor and the stator are cooled by supplying the cooling gas in the axial direction via the ventilation slots of the rotor and flowing the cooling gas from the rotor to the divided gaps of the stator core. Has been. However, in a high-speed rotating machine, it is difficult to employ a rotor having a ventilation slot as described above from the viewpoint of ensuring rigidity of the rotor and preventing scattering of accessories due to centrifugal force. A smooth rotor is employed, and the cooling structure as described above cannot be applied. Further, in a rotating machine that performs high-speed rotation, the rotor and the stator generate a large amount of heat due to iron loss, so a cooling structure with high cooling efficiency is required.

  Examples of conventional cooling structures for rotating machines that perform high-speed rotation are shown in FIGS. 5 (a), 5 (b), and 5 (c), respectively. In FIGS. 5A, 5B, and 5C, the direction in which the cooling gas flows is indicated by arrows.

  In the example shown in FIG. 5A, the cooling gas is introduced into the gap between the rotor 51 and the stator core 52 from one end side, and the cooling gas is caused to flow in the axial direction of the rotor 51 and out from the other end side. I have to. In the example shown in FIG. 5B, the stator core 52 is divided into two parts and the cooling gas is introduced into the gap, and the cooling gas reaching the surface of the rotor 51 is branched, and the surface of the rotor 51 is moved to the rotor. It is made to flow toward both ends of 51. In the example shown in FIG. 5 (c), the stator core 52 is divided into four parts, and cooling gas flows into the surface of the rotor 51 from the gap at the center, and the gap between the rotor 51 and the stator core 52. The cooling gas is caused to flow in the axial direction of the rotor 51 from both ends thereof, and the cooling gas is caused to flow out from the gaps on both sides where the stator core 52 is divided.

Patent Document 1 discloses a configuration for cooling a stator core of a turbine generator. In this configuration, the first ventilation path group in which the cooling gas flows from the outside to the inside of the stator and the second ventilation path group in which the cooling gas flows from the inside to the outside of the stator are alternately arranged in the circumferential direction. The cooling gas that is arranged and passes through the first ventilation path group and reaches the gap between the stator and the rotor passes through the second ventilation path group adjacent to both sides of the first ventilation path group. In order to reduce the temperature of the cooling gas that is configured to flow toward the outer peripheral side of the stator and rise in temperature while passing through the first ventilation path group, a shaft is provided from the gap between the ends of the stator and the rotor. The cooling gas is supplied in the direction.
JP 11-262220 A

  In general, in a high-speed rotating machine, the gap between the rotor and the stator is very narrow in order to increase the efficiency of the rotating machine, as shown in FIGS. 5 (a), (b), and (c). As described above, when the cooling gas flows in the axial direction of the rotor, the pressure loss of the flow path is large, and it is not easy to obtain the flow rate of the cooling gas necessary for cooling, and high cooling efficiency cannot be obtained. Further, in this case, the windage loss due to the rotation of the rotor increases, and the cooling gas is heated by the windage loss while the cooling gas flows in the axial direction of the rotor, the temperature of the cooling gas rises, and the cooling efficiency decreases. There is a problem of doing.

  In addition, when the configuration disclosed in Patent Document 1 is applied to a rotating machine that performs high-speed rotation, the cooling gas is supplied to the gap between the stator and the rotor in the axial direction. The pressure loss of the flow path increases. Further, the cooling gas that has passed through the first ventilation path group and reached the gap between the stator and the rotor flows into the second ventilation path group that is adjacent in the direction opposite to the rotation direction of the rotor. Therefore, the windage loss due to the rotation of the rotor increases. Therefore, even in this case, there arises a problem that the cooling efficiency is lowered.

  The present invention has been made to solve the above-described problems, and provides a cooling structure for a rotating machine that can reduce windage loss and improve the cooling efficiency of a rotor and a stator core. It is aimed.

In order to solve the above-described problems, a cooling structure for a rotating machine according to the present invention includes an inner peripheral surface of a cylindrical stator core, and a side surface of a substantially cylindrical rotor disposed inside the stator core. The stator core is divided into a plurality of divided pieces in the direction of the rotation axis of the rotor, and a second gap is provided between the plurality of divided pieces. The cylinder comprising each of the divided spaces by providing a plurality of first partition members for dividing the second gap in the circumferential direction in the second gap so as to extend in the radial direction. Gas inflow passage for flowing the first cooling gas from the outer peripheral surface side to the inner peripheral surface side of the cylindrical stator core, and from the inner peripheral surface side to the outer peripheral surface side of the cylindrical stator core Gas outflow paths for flowing the first cooling gas are alternately arranged, and flow into the first gap from the gas inflow path Substantially all of the first cooling gas flows around the rotor in the same direction as the rotation direction of the rotor as the rotor rotates due to its viscosity , and is adjacent to the gas inflow path. The first gap is narrow and the rotor can rotate at a high rotational speed to the extent that it flows into the gas outflow passage.

  According to this configuration, the first partition member is provided in the gap between the plurality of divided stator cores to alternately form the gas inflow passages and the gas outflow passages, and the gas flows from the outer peripheral surface side of the stator core. The first cooling gas that has flowed into the inflow path flows into the gap between the stator core and the rotor from the gas inflow path, flows around the rotor in the same direction as the rotation direction, and passes through the adjacent gas outflow path. Out to the outer peripheral surface side of the stator core. As described above, the first cooling gas flowing into the gap between the stator core and the rotor flows in the same direction as the rotation direction around the rotor, so that the windage loss due to the rotor can be reduced and the inflowing gas Since the gas flows out from the gas outflow path adjacent to the inflow path, the distance flowing around the rotor can be shortened to reduce the pressure loss of the flow path. Thereby, the temperature rise of cooling gas can be suppressed and the cooling efficiency of a rotor and a stator core can be improved.

  A stator coil is embedded in the inner peripheral surface of the cylindrical stator core, and a plurality of slots extending in the rotation axis direction are provided side by side in the circumferential direction of the inner peripheral surface, and embedded in the slot. The stator coil may have a gas flow path for supplying and discharging a second cooling gas to each of coil ends protruding from both ends of the stator core in the rotation axis direction.

  According to this configuration, since the coil end, the rotor, and the stator core can be cooled independently, the cooling efficiency of the entire rotating machine can be improved.

  In addition, a plurality of slots are provided in the inner peripheral surface of the cylindrical stator core, in which a stator coil is embedded and extending in the rotation axis direction, and are arranged in the circumferential direction of the inner peripheral surface. The surface of the stator coil may be configured to be located at a position retracted from the inner peripheral surface of the stator core between the slots.

  According to this configuration, the cooling gas flowing in from the gas inflow path is likely to spread in the direction of the rotation axis on the rotor surface, and the rotor surface can be uniformly cooled.

  A cylindrical outer member disposed to cover the outer peripheral surface with a third gap from the outer peripheral surface of the stator core; and an outer peripheral surface of the stator core and the outer member; A plurality of second partition members disposed so as to extend at a predetermined interval substantially parallel to the rotation axis of the rotor, and outer peripheral portions at both ends in the rotation axis direction of the stator core and the outer The third gap is partitioned into a plurality of spaces arranged in the circumferential direction of the outer peripheral surface of the stator core by an end member disposed so as to close the space between the surrounding member, and the first partition member is Each of the gas inflow passages and each of the gas outflow passages are arranged so as to communicate with the respective spaces, and the first cooling to the distribution spaces which are the respective spaces communicating with the respective gas inflow passages. A gas supply path for supplying gas and each of the gas outflow paths communicating with the gas supply path; From the set space is serial space and the gas discharge path for discharging the first cooling gas may be configured provided inside of the outer surrounding member.

  According to this configuration, the first cooling gas is supplied and discharged from the outside to the gas inflow path and the gas outflow path by incorporating the gas supply path and the gas discharge path of the first cooling gas in the surrounding member. The structure for doing this becomes easy.

  The gas supply path communicates with each of the distribution spaces, and includes a first cavity portion provided in the surrounding member, communicates with the first cavity portion, and the first cooling gas from the outside. A first gas supply port for supplying gas, and the gas discharge path communicates with each of the collective spaces, and is provided with a second cavity portion provided in the outer member, and the second And a first gas discharge port for discharging the first cooling gas to the outside.

  According to this configuration, the gas pipe for supplying the first cooling gas to the rotating machine is connected to the first gas supply port, and the gas pipe for discharging the first cooling gas is the first gas pipe. What is necessary is just to connect to a gas exhaust port, and the connection with external gas piping becomes easy.

  A stator coil is embedded in the inner peripheral surface of the cylindrical stator core, and a plurality of slots extending in the rotation axis direction are provided side by side in the circumferential direction of the inner peripheral surface, and embedded in the slot. The stator coil has first and second coil ends that protrude from both ends of the stator core in the rotation axis direction, and the surrounding member includes the first and second coil ends. A housing having first and second coil end storage portions to be stored, and a second gas for supplying a second cooling gas to each of the first and second coil end storage portions of the housing A supply port and a second gas discharge port for discharging the second cooling gas may be provided.

  According to this configuration, since the coil end, the rotor, and the stator core can be cooled independently, the cooling efficiency of the entire rotating machine can be improved. Furthermore, a gas supply port and a gas discharge port for the second cooling gas supplied to the coil end are provided in the housing including the surrounding member in which the gas supply channel and the gas discharge channel for the first cooling gas are built. Therefore, the configuration for supplying and discharging the first cooling gas and the second cooling gas from the outside becomes easy. In addition, since the first cooling gas supply path and the gas discharge path are built in the housing, the rotating machine including the housing can be prevented from being enlarged and downsized.

Also, the first gap is 1 to 2 mm, may be constructed and so that the rotor can rotate per minute 10,000 rpm or more rotational speed. In the rotating machine that performs such high-speed rotation, the effect of the present invention becomes more remarkable.

  The present invention has the configuration described above, and has an effect of providing a cooling structure for a rotating machine that can reduce windage loss and the like and improve the cooling efficiency of the rotor and the stator core. .

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

  FIG. 1 is a cross-sectional view showing a configuration of a rotating machine according to an embodiment of the present invention. 2A is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 2B is a cross-sectional view taken along the line BB in FIG. FIG. 3 is a partially enlarged view of FIG. FIG. 4 is a schematic diagram showing a cooling gas piping system outside the rotating machine. In FIGS. 1 to 4, arrows without reference numerals indicate the direction in which the cooling gas flows.

  The rotating machine of the present embodiment is an electric motor that rotates at a high speed of 10,000 rpm (rotation / min) or more, and as shown in FIG. 1, a cylindrical rotor 1 with a smooth side surface is a cylindrical stator core 5. It is arranged inside. The gap between the rotor 1 and the teeth 5a (FIG. 3) of the stator core 5 is about 1 to 2 mm. Further, the tip portion of the tooth portion 5a of the stator core 5 is expanded in the circumferential direction as shown in FIG. 3, but this expanded portion is simplified in FIGS. 2 (a) and 2 (b). Not shown.

  The rotor 1 is constructed by adhering a permanent magnet to the surface and further covering the surface with carbon fiber reinforced resin (CFRP), and the surface of the rotor 1 (cylindrical side surface) is a groove. There is no etc. and it is smooth. Both sides of the shaft of the rotor 1 are supported by bearings 3 and 4.

  The stator includes a stator core 5 and a stator coil 6. The stator core 5 is divided into a plurality (six in this embodiment) of divided pieces in the direction of the rotation axis of the rotor 1 (hereinafter referred to as “axial direction”), and a slit 8 is provided between the divided pieces. Have The stator core 5 is formed by superposing thin iron plates, and a plurality of slots 9 (FIGS. 2A and 2B) extending in the axial direction are provided on the inner peripheral surface side, and the inside of the slot 9 is The stator coil 6 is placed in the. Here, the space factor of the stator coil 6 in the slot 9 is reduced, and the surface of the stator coil 6 in the slot 9 is changed to the inner peripheral surface of the stator core 5 between the slots 9 (the teeth 5a). It is configured to recede from the surface. That is, the gap (about 3 to 4 mm) between the stator coil 6 and the rotor 1 in the slot 9 is larger than the gap (about 1 to 2 mm) between the teeth 5 a of the stator core 5 and the rotor 1. ) Is configured to be larger. In addition, space members 10 are provided between the respective divided pieces of the stator core 5 (each slit 8) so as to extend over the entire width of the slit 8 and in the radial direction of the stator core 5 (radially). Therefore, the width of each slit 8 can be kept constant. Thus, the space member 10 has a thickness equal to the width of the slit 8 (distance between the split pieces of the stator core 5) and is provided radially.

  The rotor 1 and the stator are housed in a housing 7, and the housing 7 has three supply ports 11, 12, and 13 for cooling gas, and three discharge ports 14 (FIG. 2B), 15, and 16. Is provided. In addition, a gas supply manifold 17 connected to the supply port 11 and a gas discharge manifold 18 connected to the discharge port 14 are provided inside the housing 7. Further, ring-shaped end plates (end members) 19 and 20 are provided at both ends of the stator core 5, respectively, and a space between the outer peripheral surface of the stator core 5 and the housing 7 by the end plates 19 and 20. Is separated from the space (coil end storage chambers 26, 27) on the coil end 6a, 6b side.

  Further, as shown in FIGS. 2 (a) and 2 (b), the eight cores extend substantially in parallel with the rotation axis of the rotor 1 between the outer peripheral surface of the stator core 5 and the housing 7 and at a predetermined interval. A partition member (second partition member) 21 is disposed. Both ends of each partition member 21 extending substantially parallel to the rotation axis are in contact with the above-described end plates 19 and 20, and the outer periphery of the stator core 5 is formed by the eight partition members 21 and the above-described end plates 19 and 20. A space between the surface and the housing 7 is partitioned into eight spaces. By these eight spaces, four gas supply distribution paths 22 and four gas discharge collecting paths 23 arranged in the circumferential direction of the outer peripheral surface of the stator core 5 are alternately arranged. Inside the housing 7, holes 24 are provided for communicating the gas supply manifold 17 in the housing 7 with each gas supply / distribution path 22, whereby one supply port 11 and four gas supply / distribution paths 22 are provided. Communicate. Similarly, a hole 25 is provided on the inner side of the housing 7 so that the gas discharge manifold 18 in the housing 7 communicates with each gas discharge collecting path 23, whereby one discharge port 14 and four gas discharge collecting paths are provided. 23 communicates.

  Further, the space member 10 (corresponding to 10a, 10b, 10c in FIG. 3) in contact with each partition member 21 is for separating the gas inflow passage and the gas outflow passage of the cooling gas passing through the slit 8. It also functions as a partition member (first partition member). That is, in each slit 8, the gap between the space members 10 on both sides in contact with the partition members 21 on both sides of each gas supply / distribution path 22 flows the cooling gas from the gas supply / distribution path 22 to the surface of the rotor 1. The gap between the space members 10 on both sides that are gas inflow paths and are in contact with the partition members 21 on both sides of each gas discharge collecting path 23 is a gas outflow that causes the cooling gas to flow from the surface of the rotor 1 to the gas discharge collecting path 23. It becomes a road.

  The width t (FIG. 3) of each space member 10 is set so as not to obstruct the flow of the cooling gas in the gas inflow path and the gas outflow path at the tooth portion 5a (so that the cooling gas can easily flow). . In addition, the space member 10 that is not in contact with the partition member 21 is provided in a range from the inner side to the middle of the tooth portion 5 a than the end portion on the outer peripheral side of the stator core 5, but is in contact with the partition member 21. The space member 10 is provided in a range from the end portion on the outer peripheral side of the stator core 5 to the tip end of the tooth portion 5a in order to function reliably as a partition member.

  In each slit 8, at least one space member 10 that functions as a partition member may be provided for each partition member 21 as in the present embodiment. Further, in the present embodiment, in each slit 8, the space member 10 is arranged corresponding to each tooth portion 5 a of the stator core 5 between each slot 9, but the width of each slit 8 is made constant. As long as it can be maintained, it is not always necessary to provide all the space members 10 other than the space member 10 that functions as a partition member. In short, the gas inflow path and the gas outflow path may be separated from each other in the slit 8 by the space member 10 functioning as a partition member, and all the space members 10 have a width of each slit 8 by them. As long as it can be kept constant. For example, one space member 10 other than the partition member may be provided for each of the plurality of (for example, two) tooth portions 5a, and other than the partition member if the width of the slit 8 can be kept constant by other means. The space member 10 may be omitted.

  As for the method of manufacturing the rotating machine configured as described above, for example, eight partition members 21 that are long in the axial direction are welded to the outer peripheral surface of the stator core 5 in which the space members 10 are provided in the respective slits 8. Further, ring-shaped end plates 19 and 20 are attached to both ends of the stator core 5 to which the partition member 21 is attached by welding or the like. Further, the stator coil 6 is wound to form a stator portion. Also, using a technique such as casting, the three supply ports 11, 12, 13 and the three discharge ports 14, 15, 16, the two manifolds 17, 18, and the four inner holes 24 connected to the manifold 17, A cylindrical housing body having four inner holes 25 connected to the manifold 18 is manufactured. Later, lid portions on both sides are attached to the cylindrical housing body to form the housing 7. And the above-mentioned stator part is inserted in a cylindrical housing body. Thereby, the gas supply / distribution path 22 and the gas discharge collecting path 23 partitioned by the partition members 21 and the end plates 19 and 20 are formed between the outer peripheral surface of the stator core 5 and the inner peripheral surface of the housing body. The Thereafter, the lid portions on both sides are attached to the housing body with bolts or the like.

  Next, the flow of the cooling gas inside the rotating machine according to the present embodiment will be described. The rotor 1 is assumed to rotate in the direction of the arrow R (FIGS. 2A and 2B). For example, air may be used as the cooling gas.

(Internal cooling passage for rotor and stator)
First, the cooling gas (first cooling gas) flowing in from the supply port 11 passes through the gas supply manifold 17, is supplied from each hole 24 to each gas supply distribution path 22, and flows into each slit 8. As shown in FIG. 3, for example, the cooling gas flowing into each slit 8 from a certain gas supply / distribution path 22 passes between the space members 10a and 10b (gas inflow paths) that are partition members and passes through the rotor. 1 surface is reached. Then, the space between the rotor 1 and the stator flows in the same direction as the rotation direction of the rotor 1 (arrow R) by the rotation of the rotor 1, and the space member 10 a that is a partition member from the surface of the rotor 1 After passing through 10c (gas outflow passage), it flows out to the gas discharge collecting passage 23 adjacent to the gas supply distribution passage 22 described above. In this way, the cooling gas flowing out from each slit 8 passes through each gas discharge collecting path 23, flows into the gas discharge manifold 18 from each hole 25, and is discharged from the discharge port 14. In the present embodiment, the gap between the rotor 1 and the stator core 5 (tooth portion 5a) is set to about 1 to 2 mm, and the rotor 1 is rotated by the rotation of the rotor 1 by rotating at a high speed of 10,000 rpm or more. Since the gas flow rate in the rotation direction generated in the gap with the stator is sufficiently faster than the cooling gas flow rate flowing in from each slit 8, the cooling gas flowing from each slit 8 into the gap between the rotor 1 and the stator is , Almost all flows in the same direction as the rotation direction of the rotor 1 without flowing in the direction opposite to the rotation direction of the rotor 1.

(Coil end cooling flow path)
Next, the cooling gas (second cooling gas) flowing in from the supply port 12 flows into the coil end storage chamber 26, cools the coil end 6 a, and is discharged from the discharge port 15. Similarly, the cooling gas (second cooling gas) flowing from the supply port 13 flows into the coil end storage chamber 27 to cool the coil end 6 b and is discharged from the discharge port 16.

  Since the end plates 19 and 20 are provided so as to block between the outer peripheral portions at both ends of the stator core 5 in the rotation axis direction and the housing 7, the supply is supplied from the supply ports 12 and 13 to the coil end storage chambers 26 and 27. The cooled gas does not flow into the gas supply distribution path 22 and the gas discharge collecting path 23, and the cooling gas in the gas supply distribution path 22 and the gas discharge collecting path 23 flows into the coil end storage chambers 26 and 27. I don't have to. Thus, the cooling gas flow path for cooling the rotor 1 and the inside of the stator and the cooling gas flow path for cooling the coil ends 6a and 6b are provided independently.

  The gas supply and gas discharge manifolds 17 and 18 are each formed in a ring shape without a terminal end, but may not necessarily be formed in a ring shape. In the case of the gas supply manifold 17, the supply port 11 and each gas supply distribution path 22 may be connected. For example, the circumferential position of the supply port 11 is shifted to the position of the discharge port 14 shown in FIG. 2B (the position indicated by X in FIG. 2A), and the supply port 11 at the shifted position is shifted. On the other hand, the manifold 17 may be divided at a portion (a portion indicated by Y in FIG. 2A) on the opposite side across the rotation shaft (the rotor 1). Similarly, in the case of the gas discharge manifold 18, the discharge port 14 and each gas discharge collecting path 23 may be connected to each other, and may be divided in the middle.

  In the present embodiment, the cooling gas flowing into each slit 8 from each gas supply / distribution path 22 reaches the surface of the rotor 1 and then rotates through the gap between the rotor 1 and the stator. It flows in the same direction as the direction (arrow R), and flows out from the surface of the rotor 1 to the gas discharge collecting passage 23 adjacent to the gas supply distribution passage 22 through the slit 8. Therefore, the cooling gas supplied to the surface of the rotor 1 flows in the rotation direction of the rotor 1 through the gap between the rotor 1 and the stator, and passes through a relatively short distance and flows out to the slit 8. Since the pressure loss of the flow path can be reduced and the windage loss due to the rotation of the rotor 1 can be reduced, the temperature rise of the cooling gas can be suppressed and the cooling efficiency of the rotor 1 can be improved.

  Further, the space factor of the stator coil 6 in the slot 9 is reduced, and the surface of the stator coil 6 in the slot 9 is changed to the inner peripheral surface (surface of the tooth portion 5a) of the stator core 5 in which no slot is provided. ), The cooling gas supplied to the slit 8 is likely to spread in the direction of the rotation axis on the surface of the rotor 1, and the surface of the rotor 1 can be uniformly cooled.

  Moreover, the surface of the rotor 1 can be cooled more uniformly by adjusting the number of the slits 8 into which the stator core 5 is divided and the interval between the slits 8.

  Further, when the cooling gas passes through the slit 8, heat is also taken from the stator core 5 and the stator coil 6 in the slot 9, so that the inside of the stator can be uniformly cooled.

  In this embodiment, four gas supply / distribution paths 22 and four gas discharge collecting paths 23 arranged alternately around the stator core 5 are provided, but at least one of each is required. The cooling gas that has flowed into the surface of the rotor 1 from the gas inflow path of the slit 8 passes through the gap between the rotor 1 and the stator over a short distance and flows out to the gas outflow path of the slit 8, In order to reduce the pressure loss, it is preferable that a plurality of each is disposed.

  In addition, by providing a cooling gas flow path for cooling the coil ends 6a and 6b independently of the cooling gas flow path for cooling the rotor 1 and the stator, fresh cooling gas is supplied to the coil ends 6a and 6b. A large amount can be supplied for cooling, and the entire rotating machine can be efficiently cooled.

  A plurality of partition members 21 and end plates 19 and 20 are attached to the stator core 5, and a plurality of gas supply distribution paths 22 and a plurality of gas discharge collecting paths 23 are formed between the stator core 5 and the housing 7. In the housing 7, the gas supply manifold 17 that connects the plurality of gas supply distribution paths 22 and one supply port 11, and the gas discharge that connects the plurality of gas discharge collecting paths 23 and one discharge port 14. With the configuration in which the manifold 18 is provided, the housing 7 of the rotating machine including the cooling gas passage can be reduced in size. That is, the rotating machine can be reduced in size. Further, the above configuration facilitates connection to an external cooling gas pipe.

  FIG. 4 is a schematic diagram showing an example of a cooling gas piping system outside the rotating machine of the present embodiment.

  For example, as shown in FIG. 4, a cooling gas pipe is connected to the supply ports 11, 12, 13 and the discharge ports 14, 15, 16 of the housing 7. FIG. 4 does not show the exact positions of the supply ports 11, 12, 13 and the discharge ports 14, 15, 16, but schematically shows the piping system connected thereto.

  In the rotor and stator internal cooling system (hereinafter referred to as “rotor cooling system”), a pipe 31 connected to an intake duct is connected to the supply port 11, and a valve 33 and a flow meter 34 are connected to the discharge port 14. And the piping 32 provided with the cooling fan 35 and connected to the exhaust duct is connected. In the case of this configuration, the fan 35 functions as an exhaust pump, and the flow rate of the cooling gas (air) is adjusted by adjusting the valve 33 and / or adjusting the rotational speed of the fan 35. The cooling gas flowing in from the piping 31 is supplied from the supply port 11 to the inside of the housing 7, flows from the discharge port 14 through the piping 32, and is discharged to the outside.

  In the coil end cooling system, a pipe 36 connected to an intake duct and provided with a cooling fan 39 is branched into two pipes 37 and 38, each of which has valves 40 and 42 and flow meters 41 and 43. It is provided and connected to the respective supply ports 12 and 13. The discharge ports 15 and 16 are connected to pipes 44 and 45 connected to the exhaust duct, respectively. In this configuration, the fan 39 functions as an intake pump, and the flow rate of the cooling gas (air) is adjusted by adjusting the valves 40 and 42 and / or adjusting the rotational speed of the fan 39. The cooling gas flowing in from the pipe 36 is branched into two pipes 37 and 38, supplied from the supply ports 12 and 13 to the inside of the housing 7, and flows from the discharge ports 15 and 16 through the pipes 44 and 45 to the outside. Is discharged.

  In the example of FIG. 4, the rotor cooling system is configured using an exhaust pump, but may be configured using an intake pump, such as a coil end cooling system. Further, the coil end cooling system may be configured to use an exhaust pump as in the rotor cooling system. However, in the case of a configuration using an intake pump, the temperature of the cooling gas supplied to the rotating machine slightly rises due to the heat generated by the fan acting as the intake pump, so that the rotation of the cooling gas in the rotating machine is particularly complicated. In the child cooling system, it is preferable to use an exhaust pump as shown in FIG.

  In the present embodiment described above, the rotor 1 is configured to rotate at a high speed of 10,000 rpm or more, and the upper limit value (maximum rotation speed) is theoretically infinite, but in reality, the rotor. This is limited by the influence of the resonance frequency (rotor dynamics) of the rotor, the peeling of the permanent magnet adhered to the rotor surface due to centrifugal force, and the prevention of damage.

  In the present embodiment, the cooling structure is described using an electric motor as a rotating machine. However, the cooling structure can be similarly applied to a generator.

  The cooling structure for a rotating machine according to the present invention is useful as a cooling structure for a rotating machine that performs high-speed rotation.

It is sectional drawing which shows the structure of the rotary machine of embodiment of this invention. (A) is sectional drawing in the AA line of FIG. 1, (b) is sectional drawing in the BB line of FIG. FIG. 3 is a partially enlarged view of FIG. It is a schematic diagram which shows an example of the piping system of the cooling gas outside the rotary machine of embodiment of this invention. It is a figure which shows the cooling structure of the conventional rotary machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor 3, 4 Bearing 5 Stator core 6 Stator coil 6a, 6b Coil end 7 Housing 8 Slit 9 Slot 10 Space member 11, 12, 13 Supply port 14,15,16 Discharge port 17 Gas supply manifold 18 Gas Exhaust manifolds 19 and 20 End plates 21 Partition members 22 Gas supply distribution passages 23 Gas discharge collecting passages 24 and 25 Holes 26 and 27 Coil end storage chamber

Claims (7)

A first gap is provided between the inner peripheral surface of the cylindrical stator core and the side surface of the substantially cylindrical rotor disposed inside the stator core;
The stator core is divided into a plurality of divided pieces in the direction of the rotation axis of the rotor, and has a second gap between the plurality of divided pieces;
Each of the second gaps includes a plurality of first partition members for dividing the second gap in the circumferential direction so as to extend in the radial direction, thereby including each of the divided spaces. A gas inflow passage for flowing the first cooling gas from the outer peripheral surface side to the inner peripheral surface side of the cylindrical stator core; and from the inner peripheral surface side to the outer peripheral surface side of the cylindrical stator core. Gas outlets for flowing the first cooling gas in the direction are alternately arranged,
Substantially all of the first cooling gas flowing into the first gap from the gas inflow path is rotated around the rotor as the rotor rotates due to its viscosity. A rotating machine configured such that the first gap is narrow and the rotor can rotate at a high rotation speed to the extent that it flows in the same direction and flows out to the gas outflow path adjacent to the gas inflow path. Cooling structure.   A stator coil is embedded in the inner peripheral surface of the cylindrical stator core, and a plurality of slots extending in the rotation axis direction are provided side by side in the circumferential direction of the inner peripheral surface, and the slots embedded in the slots 2. The rotating machine according to claim 1, wherein the stator coil is provided with a gas flow path for supplying and discharging a second cooling gas to each of coil ends protruding from both ends of the stator core in the rotation axis direction. Cooling structure.   A stator coil is embedded in the inner peripheral surface of the cylindrical stator core, and a plurality of slots extending in the rotation axis direction are provided side by side in the circumferential direction of the inner peripheral surface, and the stator in the slot The cooling structure for a rotating machine according to claim 1, wherein a surface of the coil is configured to be located at a position retracted from an inner peripheral surface of the stator core between the slots. A cylindrical outer member disposed to cover the outer peripheral surface with a third gap from the outer peripheral surface of the stator core, and between the outer peripheral surface of the stator core and the outer member A plurality of second partition members disposed so as to extend at a predetermined interval substantially parallel to the rotation axis of the rotor, outer peripheral portions at both ends of the stator core in the rotation axis direction, and the surrounding member The third gap is partitioned into a plurality of spaces arranged in the circumferential direction of the outer peripheral surface of the stator core, by an end member disposed so as to close the gap between
The first partition member is disposed such that each of the gas inflow passages and each of the gas outflow passages communicate with the respective spaces,
A gas supply path for supplying the first cooling gas to a distribution space, which is each of the spaces communicating with each of the gas inflow paths, and a set of each of the spaces communicating with each of the gas outflow paths The cooling structure for a rotating machine according to claim 1, wherein a gas discharge path for discharging the first cooling gas from the space is provided inside the outer member. The gas supply path communicates with each of the distribution spaces, and is provided with a first cavity portion provided in the outer member, and communicates with the first cavity portion to supply the first cooling gas from the outside. And a first gas supply port for
The gas discharge path communicates with each of the collective spaces, and has a second cavity portion provided in the surrounding member, communicates with the second cavity portion, and discharges the first cooling gas to the outside. The cooling structure for a rotating machine according to claim 4, wherein the cooling structure is configured by a first gas discharge port. A stator coil is embedded in the inner peripheral surface of the cylindrical stator core, and a plurality of slots extending in the rotation axis direction are provided side by side in the circumferential direction of the inner peripheral surface, and the slots embedded in the slots A stator coil having first and second coil ends protruding from both ends of the rotation axis direction of the stator core;
The surrounding member is a housing having first and second coil end storage portions that store the first and second coil ends,
A second gas supply port for supplying a second cooling gas to each of the first and second coil end storage portions of the housing and a second gas for discharging the second cooling gas. The cooling structure for a rotating machine according to claim 4 or 5, wherein a discharge port is provided. 2. The cooling structure for a rotating machine according to claim 1, wherein the first gap is 1 to 2 mm, and the rotor is configured to be rotatable at a rotation speed of 10,000 rotations per minute or more.

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