JP6898887B2 - Rotating machine and stator cooling structure - Google Patents

Description

The present invention relates to a rotary electric machine and a stator cooling structure thereof.

In the rotor core and stator core of a rotary electric machine, iron loss due to eddy currents and the like generated during operation contributes to heat generation and causes a decrease in efficiency. Therefore, reducing the flow of eddy currents inside each of the rotor core and the stator core is effective in ensuring the efficiency of the rotating electric machine.

For this reason, it is common practice to use a laminated structure in which disc-shaped electromagnetic steel sheets made of ferromagnets and having an opening in the center are laminated in the axial direction, respectively, for the rotor core and the stator core in the rotary electric machine. There is. As the electromagnetic steel sheet, for example, a silicon steel sheet having a relatively high magnetic permeability and a low price is used.

The stator core is arranged so as to surround the rotor core on the outer side in the radial direction of the rotor core through a gap, and is usually formed in a cylindrical shape as a whole. Further, on the inner surface of the stator core in the radial direction, a plurality of slots arranged at intervals in the circumferential direction and extending in the axial direction are formed. A stator winding penetrates each slot in the axial direction.

Normally, the rotor core and stator are housed in a frame. Cooling gas circulates in the frame to cool the rotor core, stator core, stator windings, and the like. Further, many rotary electric machines are usually provided with a cooler, and the cooling gas is cooled in the cooler, and the cooled cooling gas cools the rotor core and the stator.

In particular, inside the stator, the stator windings generate heat due to copper loss, that is, Joule heat, and inside the laminated structure, there is heat generation due to iron loss, that is, eddy current loss, or magnetic hysteresis loss. Normally, a plurality of ducts, which are flow paths outward in the radial direction, are provided at intervals in the axial direction of the stator core, and the cooling gas is flowed outward in the radial direction in the ducts to improve the cooling efficiency (patented). Reference 1).

Japanese Unexamined Patent Publication No. 2000-116060

In the stator core, a duct is formed by providing a gap between the laminated structures laminated in the axial direction. The ducts are formed at positions spaced apart from each other in the axial direction, and a flow path from the radial inner side to the radial outer side of the stator core is secured. In terms of cooling efficiency, it is preferable to increase the surface area for heat dissipation by providing a large number of ducts.

On the other hand, in a space where the magnetic steel sheet which is a ferromagnet does not exist due to the formation of the duct, the magnetic resistance becomes large. Therefore, in terms of electromagnetic performance such as securing torque, it is preferable that the duct occupies a small proportion in the stator core.

Therefore, it is desired to improve the cooling efficiency as much as possible within the limited number of ducts to be installed.

Therefore, an object of the present invention is to improve the cooling capacity of the rotary electric machine.

In order to achieve the above object, the present invention comprises a rotor shaft having a rotor shaft extending in the axial direction, a rotor core attached to the radial outer side of the rotor shaft, and a radial outer side of the rotor core. A plurality of laminated structures composed of a plurality of electromagnetic steel plates provided in the axial direction and laminated in a cylindrical shape, a stator winding that penetrates the rotor core in the axial direction, and the plurality of electromagnetic steel plates and the stator. A stator having a stator cooling structure for cooling the windings, two bearings rotatably supporting the rotor shaft on both axial sides of the rotor shaft across the rotor core, and the above. A tubular frame that houses the rotor core and the stator, and two bearings that are attached to both ends of the frame to form a closed space together with the frame and statically support each of the two bearings. A rotary electric machine including a bracket and an internal fan for circulating a cooling gas in the closed space, wherein the rotor cooling structure penetrates the plurality of laminated structures at least partially in the axial direction. It is partially sandwiched between a plurality of cooling pipes having cooling pipe openings communicating with the axial gap and the laminated structure adjacent to each other to form an axial gap between these laminated structures, and is radially outer. A plurality of gap holding structures forming a stator duct which is a flow path to the cooling pipe are provided, and the cooling pipe opening extends continuously in the axial direction from the side close to both ends of the cooling pipe to the center in the axial direction. It is characterized in that it has an elongated hole shape in which the opening width in the circumferential direction of the laminated structure increases as it goes to.

Further, in the present invention, a rotor having a rotor shaft and a rotor core, a plurality of laminated structures composed of a plurality of electromagnetic steel plates laminated in a cylindrical shape in the axial direction, and a fixing penetrating the inside of the stator core in the axial direction. A stator having a child winding, two bearings rotatably supporting the rotor shaft on both sides of the rotor shaft in the axial direction with the rotor core sandwiched therein, and the rotor core and the stator are housed. A tubular frame, two bearing brackets attached to both ends of the frame to form a closed space together with the frame, and two bearing brackets that statically support each of the two bearings, and cooling in the closed space. A stator cooling structure for cooling the plurality of electromagnetic steel plates and the bearing windings in a rotary electric machine including an internal fan for circulating a working gas, which penetrates the laminated structure at least partially in the axial direction. A plurality of cooling pipes having cooling pipe openings communicating with the axial gaps are partially sandwiched between the laminated structures adjacent to each other to form an axial gap between the laminated structures. It is provided with a plurality of gap holding structures forming a stator duct which is a flow path outward in the radial direction, and the cooling pipe opening extends continuously in the axial direction from a side close to both ends of the cooling pipe. It is characterized in that it has an elongated hole shape in which the opening width in the circumferential direction of the laminated structure increases toward the center of the direction.

According to the present invention, it is possible to improve the cooling capacity of the rotary electric machine.

It is a vertical cross-sectional view which shows the structure of the rotary electric machine which concerns on 1st Embodiment. It is external view of the stator from the outside in the axial direction which shows the structure of the stator cooling structure which concerns on 1st Embodiment. It is a partial front view in the stator duct which shows the structure of the stator cooling structure which concerns on 1st Embodiment. It is a perspective view which shows the cooling pipe for tightening of the stator cooling structure which concerns on 1st Embodiment. It is a vertical cross-sectional view which shows the structure of the rotary electric machine which concerns on 2nd Embodiment. It is external view of the stator from the outside in the axial direction which shows the structure of the stator cooling structure which concerns on 2nd Embodiment. It is a partial vertical sectional view of the stator which shows the structure of the stator cooling structure which concerns on 2nd Embodiment. FIG. 7 is a partial cross-sectional view taken along the line VIII-VIII of FIG. 7 showing the configuration of the stator cooling structure according to the second embodiment. It is a perspective view which shows the cooling pipe of the stator cooling structure which concerns on 2nd Embodiment. It is a top view which shows the cooling pipe of the stator cooling structure which concerns on 3rd Embodiment. It is a front view which shows the cooling pipe of the stator cooling structure which concerns on 3rd Embodiment.

Hereinafter, the rotary electric machine and the stator cooling structure according to the present invention will be described with reference to the drawings. Here, parts that are the same as or similar to each other are designated by a common reference numeral, and duplicate description will be omitted.

[First Embodiment]
FIG. 1 is a vertical cross-sectional view showing the configuration of a rotary electric machine according to the first embodiment. The rotary electric machine 200 has a rotor 10, two internal fans 15, a stator 20, two bearings 40, a frame 42, two bearing brackets 45 that statically support two bearings 40, and a cooler 60.

The rotor 10 has a rotor shaft 11 extending in the axial direction and rotatably supported by two bearings 40, and a rotor core 12 attached to the radial outer side of the rotor shaft 11. The inner fan 15 is attached to the rotor shaft 11 on both sides of the rotor iron core 12 in the axial direction, and circulates the cooling gas. The two inner fans 15 are axial fans.

The stator 20 has a cylindrical stator core 21, a stator winding 28, and a stator cooling structure 100 that cools the stator 20. The stator core 21 is provided on the radial outer side of the rotor core 12 via the gap 18, and has a plurality of laminated structures 23. A plurality of groove-shaped stator slots 23b (FIG. 2) extending in the axial direction and arranged at intervals in the circumferential direction are formed on the inner surface of the laminated structure 23 in the radial direction. The stator windings 28 penetrate through these stator slots 23b and extend to both sides in the axial direction, and are connected to each other or to external wiring on the axially outer side of the stator core 21.

Each of the laminated structures 23 has a plurality of electromagnetic steel sheets 22 laminated in the axial direction, and are coaxially arranged in the axial direction. A stator duct 101, which is a flow path from the inside to the outside in the radial direction, is formed between the two laminated structures 23 adjacent to each other in the axial direction. The plurality of laminated structures 23 are sandwiched by two inner clampers 31 arranged on both outer sides in the axial direction thereof. Each of the two inner clampers 31 is sandwiched by two outer clampers 32 arranged on the outer side in the axial direction thereof.

The stator cooling structure 100 holds a gap that forms a plurality of tightening cooling pipes 110 and a stator duct 101 that axially penetrate a part of the radial outer edge of the stator core 21 at intervals in the circumferential direction. It has a structure 120 and a cooling pipe inlet guide 130.

The cooler 60 has a cooling water pipe 61 and a cooler cover 62 for accommodating the cooling water pipe 61. The frame 42, the two bearing brackets 45, and the cooler cover 62 combine with each other to form a closed space 42a. In the closed space 42a, the space inside the cooler cover 62 and the space inside the frame are communicated with each other by the cooler inlet opening 63 and the two cooler outlet openings 64.

FIG. 2 is an external view of the stator from the outside in the axial direction showing the configuration of the stator cooling structure according to the first embodiment.

The inner clamper 31 has a substantially disk shape having an opening in the center, and its outer diameter is substantially equal to the outer diameter of the laminated structure 23. Further, the inner clamper 31 has tooth portions having the same shape as the stator teeth 23a at positions corresponding to the stator teeth 23a formed by the stator slots 23b at intervals in the circumferential direction in the laminated structure 23. A retainer 31a is formed.

The outer clamper 32 extends radially outward from the inner clamper 31. That is, the outer diameter of the outer clamper 32 is larger than the outer diameter of the inner clamper 31. Further, an opening 32a is formed in the outer clamper 32, and the diameter of the opening 32a is smaller than the outer diameter of the inner clamper 31.

A plurality of cooling pipe notches 31b are formed along the circumferential direction so as to cut out the outer edge of the inner clamper 31. Also in the outer clamper 32, circular cooling pipe through holes 32b are formed at positions corresponding to the notches 31b for the cooling pipe. The portion of the cooling pipe through hole 32b corresponding to the cooling pipe notch 31b of the inner clamper 31 has the same shape as the cooling pipe notch 31b. The tightening cooling pipe 110 has a circular cross section, but is not limited to a circular shape, and may be an elliptical shape, a polygonal shape, or the like.

The plurality of tightening cooling pipes 110 penetrate the cooling pipe through holes 32b of the outer clamper 32 and are fixed on both outer sides of the outer clamper 32. As a result, the two inner clampers 31 sandwiched between the two outer clampers 32 and the plurality of laminated structures 23 are tightened in the axial direction.

The tightening cooling pipe 110 is fixed by a combination of a long pipe having a screw formed in each outwardly protruding range of the outer clamper 32 and nuts on both sides, or having a bolt head at one end. A combination of bolts and nuts with male threads formed on the opposite side may be used. Alternatively, it may be a welded portion or a brazed portion.

The frame 42 is arranged on the radial outer side of the stator 20 to house the rotor core 12 and the stator 20. The stator 20 is fixed to the frame 42. Each of the two bearing brackets 45 is attached to both ends of the frame 42 in the axial direction. Each of the two bearing brackets 45 fixedly supports each of the two bearings 40.

The plurality of tightening cooling pipes 110 are for a plurality of cooling pipe grooves 23e, which are notches on the outer edge of each laminated structure 23 arranged at intervals in the circumferential direction, and for a plurality of cooling pipes of two inner clampers 31. It penetrates the notch 31b and the plurality of cooling pipe through holes 32b of the two outer clampers 32. Both ends of each tightening cooling pipe 110 are open, and serve as an inlet for cooling gas to the tightening cooling pipe 110.

The cooling pipe inlet guide 130 guides the cooling gas from the outlet side of the inner fan 15 to the inflow ports at both ends of the tightening cooling pipe 110. It extends to the outside in the radial direction.

FIG. 3 is a partial front view of the stator duct showing the configuration of the stator cooling structure. The gap holding structure 120 has a plurality of holding members 121. Each of them is arranged inside the stator teeth 23a formed in the laminated structure 23 in the circumferential direction and extends outward in the radial direction.

FIG. 4 is a perspective view showing a cooling pipe for tightening the stator cooling structure according to the first embodiment. The pipe body 111 of the tightening cooling pipe 110 is a pipe having a circular cross section. A plurality of cooling pipe openings 112 are formed in the pipe body 111 at intervals in the longitudinal direction. Each cooling pipe opening 112 is formed toward the outside in the radial direction.

The cooling pipe opening 112 is formed along a plane perpendicular to the longitudinal direction of the pipe body 111. The area of the cooling pipe opening 112 gradually increases as the distance from the end of the tightening cooling pipe 110 increases. Specifically, the axial width of each cooling pipe opening 112 is the same as the width of the stator duct 101, and the circumferential length becomes longer as the distance from the end of the tightening cooling pipe 110 increases. ing. The shape of the cooling pipe opening 112 formed in the tightening cooling pipe 110 is not limited to a rectangle. That is, it may be circular, elliptical, or other polygon.

Next, the operation of the stator cooling structure 100 according to the present embodiment configured as described above will be described.

As the rotor 10 rotates, the two inner fans 15 attached to the rotor shaft 11 rotate. The cooling gas is driven to the rotor core 12 and the stator 20 side by the respective inner fans 15. The cooling gas driven by the inner fan 15 flows in parallel with each other.

One is a flow that flows into the gap 18 from both outer sides in the axial direction and toward the center in the axial direction. This flow sequentially flows into the stator duct 101 at the axial position of the stator duct 101 formed by the gap holding structure 120, and flows outward in the radial direction.

The other flows along the respective cooling pipe inlet guides 130 and flows into a plurality of tightening cooling pipes 110 in contact with the radial outer side of the stator core 21 from both ends thereof. The cooling gas that has flowed into the tightening cooling pipe 110 from both sides in the axial direction flows out from the cooling pipe opening 112 formed in the pipe body 111 toward the outside in the radial direction.

Since the area of the cooling pipe opening 112 gradually increases from the inlets at both ends of the tightening cooling pipe 110 toward the center in the longitudinal direction, the amount of outflow from each of the cooling pipe openings 112 arranged in the axial direction is increased. The flow rates are about the same as each other.

The heat generated in the stator 20 is transferred to the tightening cooling pipe 110 via the electromagnetic steel plate 22. The heat transferred to the tightening cooling pipe 110 is removed by the cooling gas flowing out from the cooling pipe opening 112 formed in the tightening cooling pipe 110. Further, in the portion where the tightening cooling pipe 110 crosses the stator duct 101 in the axial direction, the tightening cooling pipe 110 is also cooled by the cooling gas flowing out from the stator duct 101.

The cooling gas flowing out of the stator duct 101 and the tightening cooling pipe 110 flows into the cooler 60 through the cooler inlet opening 63. The cooling gas flowing into the cooler 60 is cooled by the cooling water flowing in the cooling water pipe 61 while passing through the outside of the cooling water pipe 61. The cooling gas cooled in the cooler 60 is axially divided in the cooler cover 62, flows out from one of the two cooler outlet openings 64, and flows into the frame 42, respectively. The cooling gas that has flowed into the frame 42 flows into the inner fan 15 again and is driven.

In this way, the cooling action of the tightening cooling pipe 110 is added, so that the cooling performance is improved.

In the flow path seen from the inner fan 15, in addition to the path flowing into the stator duct 101 from the conventional gap 18, a path flowing into the tightening cooling pipe 110 is added in parallel, so that the pressure loss in one round is reduced. To do. As a result, the flow rate increases and the head decreases in the operating state. The power of the inner fan 15 is proportional to the product of the flow rate and the head, but the flow rate increases while the head decreases. Therefore, even if the power of the inner fan 15 increases, the degree is small.

Further, by improving the cooling performance of the stator 20, the width of the stator duct 101 formed in the stator core 21 can be reduced, and the electromagnetic steel plate 22 can be laminated by that amount, so that the rotary electric machine 200 can be laminated. The output can be increased.

As described above, the stator cooling structure 100 according to the present embodiment can improve the cooling capacity without lowering the efficiency of the rotary electric machine or while improving the efficiency.

[Second Embodiment]
FIG. 5 is a vertical cross-sectional view showing the configuration of the rotary electric machine according to the second embodiment. The second embodiment is a modification of the first embodiment.

In the rotary electric machine 200 according to the second embodiment, the stator 20 has a tightening rod 33 (FIG. 8) instead of the tightening cooling pipe 110 in the first embodiment, and the stator 20 is fixed. The child cooling structure 100 has a plurality of cooling pipes 110a. Further, the gap holding structure 120a and the cooling pipe inlet guide 130a of the stator cooling structure 100 are different from those of the first embodiment. In other respects, it is the same as that of the first embodiment.

FIG. 6 is an external view of the stator from the outside in the axial direction showing the configuration of the stator cooling structure according to the second embodiment.

A plurality of rod notches 31c are formed along the circumferential direction so as to cut out the outer edge of the inner clamper 31. Further, a plurality of rod grooves 23c are formed along the circumferential direction so as to cut out the outer edge of the laminated structure 23 so as to correspond to the plurality of rod notches 31c.

Also in the outer clamper 32, circular rod through holes 32c are formed at positions corresponding to the rod notches 31c. The portion of the rod through hole 32c corresponding to the rod notch 31c of the inner clamper 31 has the same shape as the rod notch 31c. The tightening rod 33 has a circular cross section, but is not limited to a circular shape, and may be an elliptical shape, a polygonal shape, or the like.

The plurality of tightening rods 33 penetrate the rod through holes 32c of the outer clamper 32 and are fixed on both outer sides of the outer clamper 32. As a result, the two inner clampers 31 sandwiched between the two outer clampers 32 and the plurality of laminated structures 23 are tightened in the axial direction. The fixing of the tightening rod 33 is the same as the fixing of the tightening cooling pipe 110 in the first embodiment.

The stator cooling structure 100 includes a gap holding structure 120a forming the stator duct 101, a plurality of cooling pipes 110a that axially penetrate the stator core 21 at intervals in the circumferential direction, and a cooling pipe inlet guide 130a. Has.

Each of the laminated structure 23 and the two clampers 31 is provided with a plurality of cooling pipe through holes 23d and a plurality of cooling pipes in a range radially inside the opening 32a of the outer clamper 32 in the circumferential direction. Through holes 31d are formed respectively.

The plurality of cooling pipes 110a penetrate through the cooling pipe through holes 23d formed in each laminated structure 23, the cooling pipe through holes 31d formed in the two inner clampers 31, and the openings 32a of the two outer clampers 32. .. Both ends of each cooling pipe 110a are open, and serve as an inlet for cooling gas to the cooling pipe 110a.

The cooling pipe inlet guide 130a guides the cooling gas from the outlet side of the inner fan 15 to the inflow ports at both ends of the cooling pipe 110a in the axial direction of the outer clamper 32 from the radial outer side to the radial outer side of the inner fan 15. It extends to the outer side.

FIG. 7 is a partial vertical sectional view of the stator showing the configuration of the stator cooling structure according to the second embodiment. Further, FIG. 8 is a partial cross-sectional view taken along the line VIII-VIII of FIG. In FIG. 7, the tightening rod 33 is not shown.

The gap holding structure 120a has a first holding member 122 and a second holding member 123. The first holding member 122 and the second holding member 123 are respectively arranged inside the stator teeth 23a formed in the laminated structure 23 in the circumferential direction and extend outward in the radial direction. The second holding member 123 extends radially outward as compared with the first holding member 122.

Either the first holding member 122 or the second holding member 123 is provided or the cooling pipe 110a penetrates there corresponding to the angular position where the stator teeth 23a is formed. In the arrangement in the circumferential direction, the first holding member 122 is arranged on both outer sides in the circumferential direction at the angle position through which the cooling pipe 110a penetrates, and the second holding member 123 is arranged on both outer sides in the circumferential direction. Such structural units are arranged next to each other in the circumferential direction.

FIG. 9 is a perspective view showing a cooling pipe of the stator cooling structure according to the second embodiment. The pipe body 111a of the cooling pipe 110a is a pipe having a circular cross section. A plurality of cooling pipe openings 112a are formed in the pipe body 111a at intervals in the longitudinal direction. The cooling pipe opening 112a is formed along a plane perpendicular to the longitudinal direction of the pipe body 111a. The area of the cooling pipe opening 112a gradually increases as the distance from the end of the cooling pipe 110a increases. Specifically, the axial width of each cooling pipe opening 112a is the same as the width of the stator duct 101, and the circumferential length becomes longer as the distance from the end of the cooling pipe 110a increases. ..

The positions of the plurality of cooling pipe openings 112a in the longitudinal direction coincide with the axial positions of the stator duct 101 formed in the stator core 21. Further, each cooling pipe opening 112a is formed toward the outer side in the radial direction.

Next, the operation of the stator cooling structure 100 according to the present embodiment configured as described above will be described.

As the rotor 10 rotates, the two inner fans 15 attached to the rotor shaft 11 rotate. The cooling gas is driven to the rotor core 12 and the stator 20 side by the respective inner fans 15. The cooling gas driven by the inner fan 15 flows in parallel with each other.

One is a flow that flows into the gap 18 from both outer sides in the axial direction and toward the center in the axial direction. This flow sequentially flows into the stator duct 101 at the axial position of the stator duct 101 formed by the gap holding structure 120a, and flows outward in the radial direction.

The other flows along the respective cooling pipe inlet guides 130a and flows into a plurality of cooling pipes 110a penetrating the stator core 21 from both ends thereof. The cooling gas that has flowed into the cooling pipe 110a from both sides in the axial direction is radially located at the axial position of the stator duct 101 formed by the gap holding structure 120a from the cooling pipe opening 112a formed in the pipe body 111a. It flows outward.

The heat generated by the stator 20 flows toward the radial outer surface of the laminated structure 23, which is the heat release point, in each of the laminated structures 23. Since the cooling pipe 110a is provided in the middle of this heat flow, the heat propagates to the cooling gas in the cooling pipe 110a via the pipe wall of the cooling pipe 110a, and the cooling gas removes the heat. The effect is produced.

Since the area of the cooling pipe opening 112a gradually increases from the inlets at both ends of the cooling pipe 110a toward the center in the longitudinal direction, the amount of outflow from the respective cooling pipe openings 112a arranged in the axial direction is the same as each other. The flow rate will be about the same.

In the stator duct 101, the cooling gas flowing out from the cooling pipe 110a in the radial direction is the adjacent first holding member 122 and the second adjacent outer side in the circumferential direction, as shown by the arrows in FIG. It spreads like a fan along the holding member 123. Therefore, in the region sandwiched between the two second holding members 123, in addition to the cooling gas flowing into the stator duct 101 from the gap 18, the flow of the cooling gas ejected from the cooling pipe opening 112a of the cooling pipe 110a Occurs.

The cooling gas flowing out from the cooling pipe opening 112a of the cooling pipe 110a into the stator duct 101 mixes with each other and is fixed while accelerating the flow of the cooling gas flowing in from the void 18 and flowing in the stator duct 101. It flows through the child duct 101 and further flows out to the outside in the radial direction of the stator duct 101.

The cooling gas flowing out of the stator duct 101 flows into the cooler 60 through the cooler inlet opening 63. The cooling gas flowing into the cooler 60 is cooled by the cooling water flowing in the cooling water pipe 61 while passing through the outside of the cooling water pipe 61. The cooling gas cooled in the cooler 60 is axially divided in the cooler cover 62, flows out from one of the two cooler outlet openings 64, and flows into the frame 42, respectively. The cooling gas that has flowed into the frame 42 flows into the inner fan 15 again and is driven.

In this way, the cooling gas flows out from the cooling pipe 110a into the stator duct 101, so that the flow rate of the cooling gas flowing in the stator duct 101 increases. Further, the heat transferred from the laminated structure 23 to the cooling pipe 110a is removed by the cooling gas. As a result, the amount of preheating by the cooling gas increases, and the cooling capacity increases.

The flow path seen from the inner fan 15 has a circular pressure due to the parallel addition of the path flowing from the cooling pipe 110a into the stator duct 101 in addition to the path flowing into the stator duct 101 from the conventional gap 18. Loss is reduced. As a result, the flow rate increases and the head decreases in the operating state. The power of the inner fan 15 is proportional to the product of the flow rate and the head, but the flow rate increases while the head decreases. Therefore, even if the power of the inner fan 15 increases, the degree is small.

As described above, the stator cooling structure 100 according to the present embodiment can improve the cooling capacity without lowering the efficiency of the rotary electric machine.

[Third Embodiment]
FIG. 10 is a plan view showing a cooling pipe of the stator cooling structure according to the third embodiment. Further, FIG. 11 is a front view showing a cooling pipe of the stator cooling structure according to the third embodiment. For convenience of explanation, the partial vertical cross section of the laminated structure 23 is indicated by a two-dot chain line.

The third embodiment is a modification of the second embodiment. In the cooling pipe 110b of the stator cooling structure 100 in the present embodiment, the cooling pipe opening 112b formed in the pipe body 111a is different from the cooling pipe opening 112a formed in the pipe body 111a in the second embodiment. Other than this, it is the same as the second embodiment.

In the present embodiment, the cooling pipe opening 112b formed in the pipe body 111a extends continuously in the longitudinal direction. The width of the opening is formed so as to increase from the side close to the openings at both ends of the cooling pipe 110b toward the center in the axial direction.

In the present embodiment formed in this way, in the axial region where the laminated structure 23 exists outside the radial direction of the opening of the cooling pipe 110b, the cooling pipe through hole 23d formed in the laminated structure 23 is formed. It becomes a flow path in the axial direction. Therefore, the cooling gas flows out in the radial direction only in the axial region in which the stator duct 101 is formed between the laminated structures 23 by the gap holding structure 120a.

As described above, in the cooling pipe 110b of the present embodiment, it is not necessary to form an opening in accordance with the axial position of the stator duct 101. Moreover, it is not necessary to form openings at a large number of places. Therefore, the load in confirmation, adjustment, and processing in forming the opening is reduced.

[Other Embodiments]
Although the embodiments of the present invention have been described above, the embodiments are presented as examples and are not intended to limit the scope of the invention. For example, in the embodiment, the case of a horizontal rotary electric machine in which the rotor shaft 11 extends in the horizontal direction is shown as an example, but the present invention is not limited to this. It may be a vertical rotary electric machine in which the rotor shaft extends in the vertical direction. Further, in the embodiment, the case where the inner fan 15 is attached to both sides in the axial direction with the rotor core 12 interposed therebetween is shown as an example, but it may be provided only on one side.

Further, in the embodiment, the case where the internal fan 15 is an axial fan is shown as an example, but for example, a centrifugal fan may be used. In this case, the flow of the cooling gas is in the opposite direction to that of the embodiment, but the same effect can be obtained by the existence of the flow path passing through the cooling pipe and the flow path passing through the void in parallel.

Moreover, you may combine the features of each embodiment. For example, the tightening cooling pipe 110 in the first embodiment may be combined with the stator cooling structure in the second embodiment or the third embodiment.

Further, the embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. The embodiments and variations thereof are included in the scope of the invention described in the claims and the equivalent scope thereof, as are included in the scope and gist of the invention.

10 ... rotor, 11 ... rotor shaft, 12 ... rotor core, 15 ... inner fan, 18 ... void, 20 ... stator, 21 ... stator core, 22 ... electromagnetic steel plate, 23 ... laminated structure, 23a ... stator Teeth, 23b ... Rotor slot, 23c ... Rod groove, 23d ... Cooling pipe through hole, 23e ... Cooling pipe groove, 28 ... Rotor winding, 31 ... Inner clamper, 31a ... Tooth presser, 31b ... Cooling pipe cutting Notch, 31c ... Rod notch, 31d ... Cooling pipe through hole, 32 ... Outer clamper, 32a ... Opening, 32b ... Cooling pipe through hole, 32c ... Rod through hole, 33 ... Tightening rod, 40 ... Bearing, 42 ... Frame , 42a ... closed space, 45 ... bearing bracket, 60 ... cooler, 61 ... cooling water pipe, 62 ... cooler cover, 63 ... cooler inlet opening, 64 ... cooler outlet opening, 100 ... stator cooling structure, 101 ... Rotor duct, 110 ... tightening cooling pipe, 110a, 110b ... cooling pipe, 111, 111a ... pipe body, 112, 112a, 112b ... cooling pipe opening, 120, 120a ... gap holding structure, 121 ... holding member, 122 ... 1st holding member, 123 ... 2nd holding member, 130, 130a ... Cooling pipe inlet guide, 200 ... Rotor

Claims (6)

A rotor shaft having a rotor shaft extending in the axial direction and a rotor core attached to the radial outer side of the rotor shaft, and a rotor shaft.
A plurality of laminated structures composed of a plurality of electromagnetic steel plates provided on the outer side in the radial direction of the rotor core and laminated in a cylindrical shape in the axial direction, a stator winding that penetrates the stator core in the axial direction, and the above. A stator having a plurality of electromagnetic steel plates and a stator cooling structure for cooling the stator windings,
Two bearings that rotatably support the rotor shaft on both sides of the rotor shaft in the axial direction with the rotor core interposed therebetween.
A tubular frame for accommodating the rotor core and the stator, and
Two bearing brackets that are attached to both ends of the frame to form a closed space together with the frame and statically support each of the two bearings.
An inner fan that circulates a cooling gas in the closed space,
It is a rotary electric machine equipped with
The stator cooling structure
A plurality of cooling pipes having a cooling pipe opening that penetrates the plurality of laminated structures at least partially in the axial direction and communicates with the gap in the axial direction.
A plurality of gap holding structures that are partially sandwiched between the laminated structures adjacent to each other to form an axial gap between these laminated structures and form a stator duct that is a flow path outward in the radial direction.
Equipped with
The cooling pipe opening is an elongated hole shape that extends continuously in the axial direction and in which the opening width in the circumferential direction of the laminated structure increases from the side close to both ends of the cooling pipe toward the center in the axial direction. Electric. The rotary electric machine according to claim 1, wherein the cooling pipe opening faces outward in the radial direction. In the plurality of laminated structures, a plurality of through holes penetrating in the axial direction at intervals in the circumferential direction are formed.
The rotary electric machine according to claim 1 or 2, wherein the cooling pipe penetrates the plurality of through holes. The gap holding structure is
The first holding member extending in the radial direction and
A second holding member that extends in the radial direction and is longer than the first holding member,
Equipped with
In the circumferential direction, the first holding members are arranged on both sides of the cooling pipe.
The second holding member is arranged on both sides in the circumferential direction with the first holding member interposed therebetween.
The rotary electric machine according to any one of claims 1 to 3, wherein the rotary electric machine is characterized in that. A plurality of cooling pipe grooves extending in the axial direction are formed on the outer peripheral surfaces of the plurality of laminated structures at intervals in the circumferential direction.
The rotary electric machine according to claim 1 or 2, wherein the cooling pipes are arranged along the plurality of cooling pipe grooves, and the plurality of laminated structures are tightened in the axial direction. It has a rotor having a rotor shaft and a rotor core, a plurality of laminated structures composed of a plurality of electromagnetic steel plates laminated in a cylindrical shape in the axial direction, and a stator winding that penetrates the stator core in the axial direction. A stator, two bearings that rotatably support the rotor shaft on both sides of the rotor shaft in the axial direction with the rotor core sandwiched therein, and a tubular frame for accommodating the rotor core and the stator. Two bearing brackets that are attached to both ends of the frame to form a closed space together with the frame and statically support each of the two bearings, and a cooling gas that circulates in the closed space. A stator cooling structure for cooling the plurality of electromagnetic steel plates and the stator windings in a rotary electric machine including a fan.
A plurality of cooling pipes having a cooling pipe opening that penetrates the laminated structure at least partially in the axial direction and communicates with the gap in the axial direction.
A plurality of gap holding structures that are partially sandwiched between the laminated structures adjacent to each other to form an axial gap between these laminated structures and form a stator duct that is a flow path outward in the radial direction.
Equipped with
The cooling pipe opening has an elongated hole shape that extends continuously in the axial direction, and the opening width in the circumferential direction of the laminated structure increases from the side near both ends of the cooling pipe toward the center in the axial direction.
Stator cooling structure.

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