JP2003219606A - Rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the maximum temperature of a coil by leveling the temperature of a stator coil within an iron core. <P>SOLUTION: A rotating electric machine lets the cooling gas discharged by a fan 27 flow toward an air gap 12 on the inside peripheral side from the outside periphery side of all the ventilation ducts of a stator 20 after heat- exchanging the cooling gas in a gas cooler 26, lets the cooling gas 11 having cooled a rotor coil by the self ventilation effect of the rotor 21 flow to the air gap 12, and sucks the cooling gas joined together in this air gap 12 into the end of the rotor by the fan 27, thus circulating the cooling gas in itself. The interval between the ventilation ducts made severally at the plural sections in axial direction of a stator iron core 23 is shorter at the stator iron core at the central side, and is longer at the stator iron core on the axial end side. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine having an improved internal ventilation cooling structure such as a turbine generator.

[0002]

2. Description of the Related Art As a conventional rotating electric machine, the actual machine is 63-83.
As described in Japanese Patent Publication No. 960 and Japanese Utility Model Laid-Open No. 63-172258, cooling gas discharged from a fan is caused to flow through a stator and a rotor, and the stator and the rotor are cooled to warm the cooling gas. There is a type that employs an in-flight ventilation cooling structure in which the gas is cooled by a gas cooler and then sent to the stator and the rotor again.

FIG. 15 is a sectional view schematically showing the cooling structure of the entire turbine generator as such a rotating electric machine.
FIG. 16 is a plan view showing a part of the stator core, and FIG. 17 is FIG.
5 is an enlarged longitudinal sectional view showing a portion A of FIG. 5, FIG. 18 is a plan view showing a part of the rotor coil, and FIG. 19 is a transverse sectional view showing a part of the rotor.

In FIG. 15, 20 is a stator frame 2.
As shown in FIG. 16, this stator 20 has a plurality of thin steel plates laminated on each other, and the interval pieces are arranged at regular intervals in the radial direction at appropriate intervals. A stator core 23 having a stator duct 24 and the stator core 2
3 and a stator coil 22 inserted into a slot formed on the inner peripheral side of the shaft 3 and extending in the axial direction.

In FIG. 16, reference numerals 23a and 24a denote a stator core and a stator duct on the central side, and 23b and 2b.
4b shows the stator core and the stator duct on the shaft end side.

Further, the stator 20 is mounted inside the stator frame 28 through a supporting member (not shown), the stator 20 is mechanically fixed, and the gas cooler 26 is held at the back corresponding to the stator 20. The support frame 29 provided is provided. In addition, a plurality of partition walls 25 that form a gas flow passage are provided on the outer peripheral surface of the stator core 23. The partition walls 25 are supported by a support frame 29 to mechanically fix the stator 20. It also has a function as a partition plate of a ventilation section that changes the ventilation direction of the duct in the radial direction formed between the laminated cores 23.

In this case, the section sandwiched by the adjacent partition walls 25 is one ventilation section, and the ventilation directions of the ventilation ducts in the radial direction are the same in this section.

On the other hand, reference numeral 21 denotes a rotor which has a minute air gap 12 in the stator 20 and which is rotatably supported by a bearing (not shown). Fans 27 are attached to both sides.

In this rotor 21, as shown in FIGS. 17 to 19, a plurality of coil slots 1 are provided in the outer peripheral portion of a rotor core 8 in the circumferential direction, and the rotor coils 3 are respectively provided in these coil slots 1. Are stacked in multiple stages and are fixed to the slot openings by the rotor wedges 7 via the clip page blocks 6.

In this case, in order to insulate the rotor coil 3 from each other, a turn insulator 4 is interposed between the laminated layers, and the rotor coil 3 and the coil slot 1 are insulated from each other on the inner peripheral portion of the slot. The slot insulator 5 is inserted.

By the way, as the cooling structure of the rotor coil 3, the direct cooling system in which the cooling gas is brought into direct contact with the rotor coil for cooling is the most efficient, and among them, the simple structure has a high cooling performance. Therefore, the radial flow cooling method has been adopted for the turbine generator.

Therefore, in order to provide the cooling structure by the radial flow cooling system, the sub-slot 2 is provided over the entire axial length of the bottom of the coil slot 1 in which the rotor coil 3 is mounted, and the sub-slot 2 and the coil ventilation hole are provided. And a plurality of radial paths 10 are communicated with each other to form a cooling gas passage.

The stator iron core 23 is fixed to the stator air supply portion 14 for flowing the cooling gas from the outer peripheral side of the stator to the air gap 12 and the air gap 12 as shown by the diagonal lines in the upper part of the drawing of FIG. A stator exhaust portion 15 for flowing a cooling gas is provided to the outer peripheral portion of the child iron core 23.

In the rotating electric machine having such a structure, the cooling gas 11 sent from the fan 27 flows through the air supply section 14 which flows from the outer diameter side to the inner diameter side of the stator 20, and the stator 20 and the rotor 21. Air gap 12 which is the void of
Flowing through the exhaust section 15 flowing from the inner diameter side of the stator 20 to the outer diameter side, heat is exchanged by the gas cooler 26, and then returns to the fan 27.

In this case, the cooling gas 11 is introduced into the sub-slot 2 from the axial end portion of the rotor 21, that is, the iron core end portion 9 and flows to the area beyond the central portion in the axial direction, and is further indicated by an arrow in FIG. As shown, due to the centrifugal fan effect due to the rotation of the rotor 21, the radial paths 10 are sequentially branched. The cooling gas 11 passing through each radial path 10 is
After absorbing the heat generated by the rotor coil 3, the heat is discharged to the air gap 12.

In the stator air supply section 14, the cooling gas discharged from the rotor 21 and the cooling gas flowing from the stator 20 join together, and the combined cooling gas flows in the axial direction to exhaust the stator. It is discharged from the portion 15 to the outer circumference of the stator core 13.

[0017]

As described above, in the rotary electric machine having the conventional stator and rotor ventilation system, the exhaust section is cooled by the cooling gas whose temperature is raised by heat exchange in the air supply section. However, in this ventilation system, the axial distribution of the temperature rise value of the stator coil 22 is low in the air supply section and high in the exhaust section, as shown by line B in FIG. The coil temperature in the iron core becomes uneven.

The present invention has been made in view of the above circumstances, and aims to make the stator coil temperature in the core uniform.
An object of the present invention is to provide a rotating electric machine provided with a ventilation system capable of reducing the maximum temperature of a coil.

[0019]

In order to achieve the above object, the present invention constitutes a rotating electric machine by the following means.

According to the first aspect of the invention, a radial ventilation duct is formed at a plurality of axial positions of the stator core attached to the stator frame, the radial ventilation ducts extending from the outer peripheral side to the inner peripheral side being formed, and at the inner peripheral portion. In the existing coil slot, where the stator coil is housed, and in the coil slot that is rotatably supported by the bearing so that there is an air gap on the inner peripheral side of this stator and is located on the outer peripheral portion of the rotor core. The rotor coil is housed and a rotor wedge is inserted into the opening of the coil slot through a cripage block, and the cooling gas provided in the stator frame and enclosed in the machine is cooled. A gas cooler to be provided, and a fan provided at the shaft end of the rotor, and after the cooling gas discharged by the fan is heat-exchanged in the gas cooler,
Flowing from the outer peripheral side of all the ventilation ducts of the stator toward the air gap on the inner peripheral side, the cooling gas that has cooled the rotor coil by the self-ventilating fan effect of the rotor is caused to flow into the air gap, and joins at the air gap. In a rotating electric machine comprising a ventilation system in which the cooling gas is sucked into the rotor end portion by the fan to circulate in the machine,
The distance between the ventilation ducts formed at a plurality of positions in the axial direction of the stator core is short in the central stator core,
The stator core on the shaft end side is made longer.

According to a second aspect of the present invention, a radial ventilation duct is formed at a plurality of axial positions of the stator core attached to the stator frame, the radial ventilation ducts extending from the outer peripheral side to the inner peripheral side being formed, and at the inner peripheral portion. In the existing coil slot, where the stator coil is housed, and in the coil slot that is rotatably supported by the bearing so that there is an air gap on the inner peripheral side of this stator and is located on the outer peripheral portion of the rotor core. The rotor coil is housed and a rotor wedge is inserted into the opening of the coil slot through a cripage block, and the cooling gas provided in the stator frame and enclosed in the machine is cooled. A gas cooler to be provided, and a fan provided at the shaft end of the rotor, and after the cooling gas discharged by the fan is heat-exchanged in the gas cooler,
Flowing from the outer peripheral side of all the ventilation ducts of the stator toward the air gap on the inner peripheral side, the cooling gas that has cooled the rotor coil by the self-ventilating fan effect of the rotor is caused to flow into the air gap, and joins at the air gap. In a rotating electric machine comprising a ventilation system in which the cooling gas is sucked into the rotor end portion by the fan to circulate in the machine,
The width of the ventilation ducts formed at a plurality of axial positions of the stator core is wide at the central stator core portion and narrow at the axial end stator core portion.

The invention corresponding to claim 3 is the rotary electric machine according to claim 1 or 2, wherein the rotor is provided in the axial direction of the rotor core, and the bottom of the coil slot is provided. And a sub-slot for supplying cooling gas to the sub-slot, the sub-slot being communicated with the sub-slot, passing through the rotor coil in the radial direction, and being inclined toward the end side in the flow direction of the cooling gas flowing through the air gap. A plurality of radial paths, and a hole provided in the cripage block and the rotor wedge such that the radial path and the air gap communicate with each other.

According to a fourth aspect of the present invention, in the rotary electric machine according to the third aspect of the present invention, the radial paths are formed with the same inclination angle at which the branch angle with the sub-slot exceeds 90 °. There is.

The invention corresponding to claim 5 is the rotary electric machine according to claim 3, wherein the radial path is
The branch angle with the sub-slot is 90 °, which is formed halfway in the outer diameter direction of the rotor core, and is inclined toward the end side in the flow direction of the cooling gas flowing through the air gap.

The invention corresponding to claim 6 is the rotary electric machine according to claim 3, wherein the radial path is
The branch angle with the sub-slot is formed at an inclination angle of less than 90 ° to a midpoint in the outer diameter direction of the rotor core, and is inclined toward the end side in the flow direction of the cooling gas flowing through the air gap. Let

The invention corresponding to claim 7 is the rotary electric machine according to claim 6, wherein the radial path is
An intermediate part of the rotor core whose inclination angle changes is formed by a straight line portion perpendicular to the axial direction.

The invention corresponding to claim 8 is the rotary electric machine according to claim 3, wherein the radial path is
It is formed by combining all or any one of the radial paths described in claims 4 to 7.

According to a ninth aspect of the present invention, in the rotary electric machine according to the third aspect of the invention, the holes of the cripage block and the rotor wedge are inclined at the same angle as the inclination angle of the radial path.

According to a tenth aspect of the present invention, in the rotary electric machine according to the third aspect of the invention, the holes of the cripage block and the rotor wedge are inclined at an angle larger than the inclination angle of the radial path.

According to an eleventh aspect of the invention, in the rotating electric machine of the invention according to the third aspect, the holes of the rotor wedge are directed toward the end side in the flow direction of the cooling gas flowing through the air gap. It is tilted and its tilt angle is changed in the radial direction.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing the structure of a ventilation system according to a first embodiment of a rotating electric machine according to the present invention.
The same parts as those of FIG. 15 are designated by the same reference numerals, and the description thereof will be omitted. Here, only different points will be described. It should be noted that in FIG. 1, the upper half and the lower half are substantially symmetrical with respect to the rotation axis, and therefore the upper half is shown.

In FIG. 1, the structure of the stator 20 is as follows.
As shown in FIG. 2, the distance between the stator ducts 24 formed at a plurality of axial positions of the stator core 23 is short at the stator core portion 23c on the center side, and the stator core portion 2 on the shaft end side is
The partition wall 25 of FIG. 15 is removed to remove the partition wall 25 of FIG. 15 so that all gas passages flowing in the stator core 23 are passed from the outer peripheral side of the stator 20 to the air gap 12 existing between the rotor 21 and the rotor 21. It was done like this. In this case, the distance between the stator ducts 24 may be gradually increased from the central portion side stator core portion 23c toward the shaft end side stator core portion 23d, or may be gradually increased. You may

In the rotating electric machine having such a structure, the cooling gas 11 discharged by the fan 27 provided at the rotor shaft end is heat-exchanged by the gas cooler 26, and then the outer diameter side of all the stators 20. The cooling gas flowing toward the air gap 12 on the inner diameter side and passing through the rotor 21 merges from the rotor 21 at the air gap 12 in the gap between the stator 20 and the rotor 21, and then, at the rotor shaft end. The gas is sucked by the fan 27 and flows toward the shaft end side, and then the heat is exchanged again by the gas cooler 26 through the gas flow passage existing between the stator frame 28 and the support frame 29 shown in FIG. Follow the gas circulation path.

Therefore, in cooling the stator 20 in such a ventilation system, the cooling gas whose temperature is lowered in the gas cooler 26 flows from the outer diameter side of all the stators 20 toward the air gap 12 on the inner diameter side. Therefore, the temperature difference from the flow surface becomes large, and the cooling performance can be improved.

By the way, in the ventilation system of the rotating electric machine, when the intervals of the stator ducts 24 are uniform and the ventilation resistance of the stator duct portions is the same in the axial direction, the distance from the shaft end side for supplying the cooling gas 11 is increased. However, since the total ventilation resistance when circulating is large, the flow rate of the cooling gas flowing through the stator duct 24 on the central side becomes small. Therefore, the temperature of the stator coil 22 on the center side becomes high, and the temperature may not be made uniform.

On the other hand, in the present embodiment, the distance between the stator ducts formed in the stator core 23 is short in the stator core portion 23c on the center side, and the stator core portion 23 on the shaft end side is small.
Since it is longer at d, the ventilation resistance of the stator duct portion on the central side is smaller than that on the shaft end side. As a result, the flow rate distribution in the axial direction of the stator duct can be made uniform,
The axial distribution of the temperature rise value of the stator coil 22 in the iron core can be made uniform as shown by the curve A in FIG.

FIG. 3 is a sectional view schematically showing the arrangement of the ventilation ducts of the stator in the second embodiment of the rotating electric machine according to the present invention.

In the second embodiment, as shown in FIG. 3, the width of the stator ducts 24 formed at a plurality of positions in the axial direction of the stator core 23 is set to the width of the stator core portion 23e on the center side.
Is wide and narrowed at the stator core portion 23f on the shaft end side, and the partition wall 25 of FIG. It is designed so that it can escape to the air gap 12 existing between the air gap 21 and 21. In this case, the stator duct 24
The width of the core is fixed from the stator core portion 23a on the central side to the shaft end side by using space pieces having different heights as the space pieces arranged at appropriate intervals in the radial direction between the laminated iron cores. Child iron core 2
It may be gradually narrowed toward 3b, or may be gradually narrowed.

As in the second embodiment, the width of the stator duct 24e on the central side is made wider than that of the stator core duct 24f on the shaft end side. Similarly to the above embodiment, the ventilation resistance of the central stator duct portion is smaller than that of the shaft end portion. Thereby, the axial flow rate distribution of the stator duct can be made uniform, and the axial distribution of the temperature rise value of the stator coil 22 in the iron core is made uniform as shown by the curve A in FIG. be able to.

FIG. 5 is a vertical sectional view showing a main part of a rotor in a third embodiment of the rotating electric machine according to the present invention. The configuration described in the first embodiment or the second embodiment is applied to the stator side.

As the structure of the rotor 21 shown in FIG. 1, a plurality of coil ventilations formed by communicating with a sub-slot 2 provided over the entire axial length of the bottom of the coil slot 1 in which the rotor coil 3 is mounted. As the holes, as shown in FIG. 5, a radial path 10a having an angle of branching with the sub-slot 2 of more than 90 ° and inclined toward the end side in the flow direction of the cooling gas flowing through the air gap 12 is formed. To do.

Further, the ventilation holes formed in the cripage block 6 and the rotor wedge 7 are also formed so that the ventilation holes are inclined toward the shaft end along the flow direction in the air gap 12. .

In the rotary electric machine having such a structure, the cooling gas 11 passes through the radial path 10a from the sub-slot 2, and is further discharged into the air gap 12 through the openings of the cripage block 6 and the rotor wedge 7. .

When the cooling gas flow shape in the rotor is used as in the third embodiment, there is a velocity component from the rotor wedge 7 which is the outlet of the rotor draft to the shaft end through the air gap 12. become.

Therefore, since the cooling gas 11 flowing into the air gap 12 is taken in by the fan 27 installed at the rotor shaft end, the ventilation loss at the time of joining the rotor 21 to the air gap 12 can be reduced. it can.

The following embodiments relating to FIG. 6 to FIG. 9 are the ones in which the shape of the radial path is changed, and since the flow and effect of the cooling gas are the same, the description thereof is omitted and the radial path 10 is omitted. Only the features of will be described. The configuration described in the first embodiment or the second embodiment is applied to the stator side.

FIG. 6 is a longitudinal sectional view showing a main part of a rotor in a fourth embodiment of a rotating electric machine according to the present invention.

In the fourth embodiment, as a ventilation hole of the rotor coil, the branch angle with the sub-slot 2 is raised to the middle stage layer of the coil at a branch angle of 90 °, and the inside of the air gap 12 is located on the outer diameter side. The radial path 10b is formed so as to be inclined at an appropriate angle in the flow direction.

In the rotary electric machine equipped with the rotor having such a structure, the branch angle with the sub-slot 2 is smaller than that in the third embodiment, so that the branch loss of the flow of the cooling gas can be reduced. You can

FIG. 7 is a vertical cross-sectional view showing a main part of a rotor in a fifth embodiment of a rotating electric machine according to the present invention.

In the fifth embodiment, as the ventilation holes of the rotor coil, when the branch angle with the sub-slot 2 is less than 90 °, the coil is inclined to the intermediate stage layer, and the inside of the air gap 12 is on the outer diameter side. The radial path 10c is formed so as to be inclined at an appropriate angle in the direction of flow.

In the rotary electric machine provided with the rotor having such a structure, since the branch angle with the sub-slot 2 is smaller than that in the fourth embodiment, the branch loss of the flow of the cooling gas can be reduced. You can

FIG. 8 is a longitudinal sectional view showing a main part of a rotor in a sixth embodiment of the rotating electric machine according to the present invention.

In the sixth embodiment, as the ventilation holes of the rotor coil, an intermediate stage layer which is inclined to the intermediate stage layer of the coil when the branch angle with the subslot 2 is less than 90 ° and is inclined toward the outer diameter side from this is formed. A linear portion perpendicular to the axial direction is formed, and a radial path 10d is formed on the outer diameter side, which is inclined at an appropriate angle toward the flow direction in the air gap 12.

Even with such a structure, the same operational effect as that of the fourth embodiment can be obtained.

FIG. 9 is a longitudinal sectional view showing the main part of a rotor in a seventh embodiment of the rotating electric machine according to the present invention.

In the seventh embodiment, the radial path 10e is formed by combining the shapes of the ventilation holes of the rotor coil shown in FIGS.

Even with such a structure, the same operational effect as that of the fourth embodiment can be obtained.

FIG. 10 is a partial vertical cross-sectional view showing a cripage block of a rotor in an eighth embodiment of a rotating electric machine according to the present invention, and any other configuration is applied to any of FIGS. 5 to 9. To be done.

In the eighth embodiment, the cripage block 6 provided near the opening of the coil slot of the rotor.
A ventilation hole 31a is formed in a at an inclination angle 32a which is the same as the inclination angle of the radial duct on the outermost diameter side of the stator coil in the direction of flow in the air gap.

With such a cripage block 6a, since the cooling gas smoothly flows from the radial path of the rotor coil to the ventilation holes of the cripage block, it is possible to reduce the pressure loss with respect to the flow of the cooling gas.

FIG. 11 is a partial vertical cross-sectional view showing a cripage block of a rotor in a ninth embodiment of a rotating electric machine according to the present invention, and other configurations are applicable to any one of FIGS. 5 to 9. To be done.

In the ninth embodiment, the cripage block 6 provided near the opening of the coil slot of the rotor.
B is formed with a ventilation hole 31b inclined toward the flow direction in the air gap at an inclination angle 32b larger than the inclination angle 33 of the radial duct on the outermost diameter side of the stator coil.

With such a cripage block 6b, the cooling gas smoothly flows from the radial path of the rotor coil to the ventilation holes 31b of the cripage block 6b, so that the pressure loss with respect to the flow of the cooling gas can be reduced. it can.

FIG. 12 shows a tenth embodiment of the rotating electric machine according to the present invention.
FIG. 10 is a partial vertical cross-sectional view showing the rotor wedge in the embodiment of the present invention, and any of FIGS. 5 to 9 is applied to the other configuration.

In the tenth embodiment, the rotor wedge 7a provided at the open end of the coil slot of the rotor is inclined in the radial duct on the outermost diameter side of the stator coil toward the flow direction in the air gap. The ventilation holes 34a are formed to be inclined at the same inclination angle 35a as the angle.

With such a rotor wedge 7a, the flow of the cooling gas flowing out from the ventilation hole 34a has a velocity component toward the shaft end which is the flow direction in the air gap, and the cooling gas is the rotor. Since it smoothly flows from the radial path of the coil to the ventilation hole of the cripage block, it is possible to reduce the merging loss of the cooling gas in the air gap.

FIG. 13 shows an eleventh embodiment of the rotating electric machine according to the present invention.
FIG. 10 is a partial vertical cross-sectional view showing the rotor wedge in the embodiment of the present invention, and any of FIGS. 5 to 9 is applied to the other configuration.

In the eleventh embodiment, the rotor wedge 7b provided at the open end of the coil slot of the rotor is provided with a tilt angle of the outermost radial duct of the stator coil toward the flow direction in the air gap. Inclination angle 35b larger than 33
The ventilation holes 34b that are inclined at are formed.

With such a rotor wedge 7a, the flow of the cooling gas flowing out from the ventilation holes 34b has a velocity component toward the shaft end which is the flow direction in the air gap, and the cooling gas is the rotor. Since it smoothly flows from the radial path of the coil to the ventilation hole of the cripage block, it is possible to reduce the merging loss of the cooling gas in the air gap.

FIG. 14 shows a twelfth rotating electric machine according to the present invention.
FIG. 10 is a partial vertical cross-sectional view showing the rotor wedge in the embodiment of the present invention, and any of FIGS. 5 to 9 is applied to the other configuration.

In the twelfth embodiment, the rotor wedge 7c provided at the open end of the coil slot of the rotor is directed toward the flow direction in the air gap, and its inclination angle is changed midway to incline the ventilation. The holes 34c are formed.
In this case, the inclination angle on the inner diameter side is formed to be the same as or larger than the inclination angle of the radial duct on the outermost diameter side of the stator coil, and the inclination angle on the outer diameter side is set to be larger than the inclination angle on the inner diameter side. is there.

With such a rotor wedge 7a, the flow of the cooling gas flowing out from the ventilation holes 34c has a velocity component toward the shaft end which is the flow direction in the air gap, and the cooling gas is the rotor. Since it smoothly flows from the radial path of the coil to the ventilation hole of the cripage block, it is possible to reduce the merging loss of the cooling gas in the air gap.

[0075]

As described above, according to the present invention, it is possible to provide a rotating electric machine having a ventilation system capable of making the temperature of the stator coil in the iron core uniform and reducing the maximum temperature of the coil.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the configuration of a ventilation system according to a first embodiment of a rotating electric machine according to the present invention.

FIG. 2 is a cross-sectional view showing an arrangement of ventilation ducts of the stator core in the same embodiment.

FIG. 3 is a cross-sectional view showing an arrangement state of ventilation ducts of a stator core in a second embodiment of a rotating electric machine according to the present invention.

FIG. 4 is a curve diagram showing an example of the relationship between the temperature rise value of the stator coil of the present invention and the axial position from the coil end in comparison with a conventional example.

FIG. 5 is a vertical cross-sectional view showing a main part of a rotor in a third embodiment of a rotating electric machine according to the present invention.

FIG. 6 is a vertical cross-sectional view showing a main part of a rotor in a fourth embodiment of a rotating electric machine according to the present invention.

FIG. 7 is a longitudinal sectional view showing a main part of a rotor in a fifth embodiment of a rotating electric machine according to the present invention.

FIG. 8 is a vertical cross-sectional view showing a main part of a rotor in a sixth embodiment of a rotating electric machine according to the present invention.

FIG. 9 is a vertical cross-sectional view showing a main part of a rotor in a seventh embodiment of a rotating electric machine according to the present invention.

FIG. 10 is a partial sectional view showing a cripage block of a rotor in an eighth embodiment of a rotating electric machine according to the present invention.

FIG. 11 is a partial sectional view showing a cripage block of a rotor in a rotating electric machine according to a ninth embodiment of the present invention.

FIG. 12 is a partial vertical sectional view showing a wedge of a rotor in a tenth embodiment of a rotating electric machine according to the present invention.

FIG. 13 is a partial vertical cross-sectional view showing a wedge of a rotor in an eleventh embodiment of a rotating electric machine according to the present invention.

FIG. 14 is a partial vertical sectional view showing a wedge of a rotor in a twelfth embodiment of a rotary electric machine according to the present invention.

FIG. 15 is a configuration diagram showing a conventional ventilation system for a rotating electric machine.

FIG. 16 is a configuration diagram showing a stator core of a conventional rotating electric machine.

FIG. 17 is a vertical sectional view of a portion A of the conventional rotating electric machine shown in FIG.

18 is a plan view of a rotor coil of the conventional rotating electric machine shown in FIG.

19 is a transverse cross-sectional view of the rotor of the conventional rotating electric machine shown in FIG.

[Explanation of symbols]

1: Coil slot 2: Sub slot 3: Rotor coil 4: Turn insulation 5: Slot insulator 6: Clear page block 7: Rotor wedge 8: Rotor iron core 9: Iron core end 10: Radial pass 11: Cooling gas 12: Air gap 13: Stator core 14: Air supply section 15: Exhaust section 16: Cooling gas 20: Stator 21: Rotor 22: Stator coil 23: Stator core 24: Stator duct 25: Partition wall 26: Gas cooler 27: Fan 31: Clear page block ventilation hole 32: Clear page block ventilation hole inclination 33: Inclination of radial path 34: Rotor wedge ventilation holes 35: Inclination of rotor wedge ventilation holes

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yukihiko Kazao             2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa               Toshiba Keihin Office (72) Inventor Yasuo Kabata             2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa               Toshiba Keihin Office F-term (reference) 5H603 AA12 BB02 BB05 BB07 BB09                       BB12 CA02 CA04 CB02 CC01                       CD01 CD22 CE01 CE05 EE21                 5H605 AA01 BB01 BB10 BB17 CC01                       DD11                 5H609 BB03 PP02 PP05 PP06 PP07                       PP08 PP09 PP10 QQ03 QQ10                       QQ16 QQ17 QQ18 RR02 RR17                       RR35 RR51

Claims (11)

[Claims] 1. A radial ventilation duct extending from an outer peripheral side to an inner peripheral side is formed at a plurality of axial positions of a stator core attached to a stator frame, and a stator coil is provided in a coil slot existing in the inner peripheral portion. The rotor coil is housed in the stator and the coil slot in the outer periphery of the rotor core, which is rotatably supported by bearings so that there is an air gap on the inner peripheral side of the stator. A rotor having a rotor wedge inserted into the opening of the coil slot via a cripage block, a gas cooler provided in the stator frame for cooling the cooling gas sealed in the machine, and A fan provided at the shaft end of the rotor, heat-exchanges the cooling gas discharged by the fan with the gas cooler, and then from the outer peripheral side of all ventilation ducts of the stator Flow toward the air gap on the peripheral side, let the cooling gas that cools the rotor coil by the self-ventilating fan effect of the rotor flow into the air gap, and suck the cooling gas merged in the air gap into the rotor end by the fan. In a rotary electric machine that constitutes a ventilation system that circulates inside the machine, the distance between ventilation ducts formed at a plurality of axial positions of the stator core is short in the central stator core, A rotary electric machine characterized in that the stator core portion on the side is made longer. 2. A radial ventilation duct extending from an outer peripheral side to an inner peripheral side is formed at a plurality of axial positions of a stator core attached to a stator frame, and a stator coil is provided in a coil slot existing in the inner peripheral portion. The rotor coil is housed in the stator and the coil slot in the outer periphery of the rotor core, which is rotatably supported by bearings so that there is an air gap on the inner peripheral side of the stator. A rotor formed by inserting a rotor wedge into the opening of the coil slot via a cripage block, a gas cooler provided in the stator frame for cooling the cooling gas sealed in the machine, and A fan provided at the shaft end of the rotor, heat-exchanges the cooling gas discharged by the fan with the gas cooler, and then from the outer peripheral side of all ventilation ducts of the stator Flow toward the air gap on the peripheral side, let the cooling gas that cools the rotor coil by the self-ventilating fan effect of the rotor flow into the air gap, and suck the cooling gas merged in the air gap into the rotor end by the fan. In a rotary electric machine that constitutes a ventilation system that circulates inside the machine, the width of ventilation ducts formed at a plurality of axial positions of the stator core is wide at the stator core portion on the central side and at the shaft end side. A rotating electric machine characterized in that it is configured to be narrowed at the stator core portion of. 3. The rotating electric machine according to claim 1 or 2, wherein the rotor is provided in the axial direction of the rotor core, and a sub-slot for supplying a cooling gas to the bottom of the coil slot. A plurality of radial paths that communicate with the sub-slots and radially pass through the rotor coil, and that are inclined toward an end portion side in the flow direction of the cooling gas flowing through the air gap, A rotary electric machine having a hole provided in the cripage block and the rotor wedge such that the radial path and the air gap communicate with each other. 4. The rotary electric machine according to claim 3, wherein each radial path has a branch angle of 9 with respect to the sub-slot.
A rotating electric machine characterized by being formed with the same inclination angle exceeding 0 °. 5. The rotor of a rotating electric machine according to claim 3, wherein the radial path has a branch angle of 90 ° with the sub-slot and is formed partway in the outer radial direction of the rotor core. A rotating electric machine characterized by being inclined toward an end portion side in a flow direction of a cooling gas flowing through an air gap. 6. The rotor of a rotating electric machine according to claim 3, wherein the radial path is formed up to a midpoint in an outer radial direction of the rotor core at an inclination angle of a branch angle of less than 90 ° with the sub-slot. A rotary electric machine characterized by being inclined toward the end side in the flow direction of the cooling gas flowing through the air gap. 7. The rotor of a rotating electric machine according to claim 6, wherein the radial path is formed by a straight line portion perpendicular to the axial direction at an intermediate portion of the rotor core whose inclination angle changes. A rotating electric machine characterized by the above. 8. The rotor for a rotating electric machine according to claim 3, wherein the radial path is formed by combining all or any one of the radial paths according to any one of claims 4 to 7. Rotating electric machine. 9. The rotor of the rotating electric machine according to claim 3, wherein the holes of the cripage block and the rotor wedge are inclined at the same angle as the inclination angle of the radial path. 10. The rotor of the rotating electric machine according to claim 3, wherein the holes of the cripage block and the rotor wedge are inclined at an angle larger than the inclination angle of the radial path. 11. The rotor of a rotating electric machine according to claim 3, wherein the hole of the rotor wedge is inclined toward an end side in a flow direction of a cooling gas flowing through the air gap,
A rotating electric machine characterized in that its inclination angle is changed in the radial direction.