JP2020182325A - Rotor of rotating electric machine - Google Patents

Abstract

To reduce the separation of the cooling gas flow generated on the wall surface on the upstream side of a sub-slot at the cooling gas inlet of the coil ventilation path, and efficiently cool the rotor coil.SOLUTION: A rotor of a rotating electric machine according to an embodiment includes a coil slot that stores a rotor coil, a sub-slot that ventilates cooling gas in the rotor axis direction, and a plurality of coil ventilation passages provided in the rotor coil, and introducing cooling gas from the sub-slot to ventilate in the outer diameter direction of the rotor, and the cooling gas flows into the sub-slot from the end of the rotor core, and further flows into the individual coil ventilation passages in a branched manner. At least one coil ventilation passage has a flow path width in the rotor rotation direction narrower on the downstream side of the sub-slot than that on the upstream side of the sub-slot at least at a cooling gas inlet portion of the coil ventilation path.SELECTED DRAWING: Figure 1

Description

An embodiment of the present invention relates to a rotor of a rotary electric machine.

Examples of the structure of the rotor of a general rotary electric machine, for example, a turbine generator are shown in FIGS. 14 to 16.

FIG. 14 is a cross-sectional view showing an example of the cross-sectional shape when the rotor core is viewed in the rotor axial direction, and FIG. 15 is a cross-sectional view showing the periphery of the coil slot shown in FIG. 14 in an enlarged manner. FIG. 16 is a cross-sectional view showing an example of the cross-sectional shape when the rotor (the range from the end of the iron core on one side to the vicinity of the center of the iron core) is viewed in the direction of rotation of the rotor.

As shown in FIG. 14, a plurality of coil slots 2 are arranged at predetermined intervals in the circumferential direction of the rotor core 1, and sub-slots 3 are provided on the inner peripheral side of each coil slot 2. .. The rotor coil 4 is housed in each coil slot 2.

As shown in FIG. 15, each rotor coil 4 is configured by laminating a plurality of field conductors. The rotor coil 4 is insulated from the rotor shaft 10 and the rotor wedge 6 by an insulating material 5, and is fixed by inserting the rotor wedge 6 into the opening end of the coil slot (not shown). Specifically, as shown in FIG. 15, the insulating material 5 is shown between the rotor core 1 and the rotor coil 4, between the rotor wedge 6 and the rotor coil 4, and further in FIG. By being inserted between the holding ring 9 and the rotor coil 4 as described above, the insulating property of the rotor coil 4 is ensured. Further, although not shown in FIG. 15, an insulating material is also inserted between the individual rotor coils 4.

As shown in FIGS. 15 and 16, each subslot 3 is provided on the rotor shaft 10 to form a cooling gas flow path extending in the rotor axial direction on the inner diameter side of each coil slot 2. There is. On the rotor outer diameter side of each subslot 3, a plurality of coil ventilation passages 7 (ventilation flow paths of the rotor coil 4) extending in the rotor radial direction so as to communicate with the subslot 3 are arranged on the rotor shaft. It is provided at predetermined intervals in the direction. On the rotor outer diameter side of each coil ventilation passage 7, a ventilation passage that penetrates the insulating material 5 and the rotor wedge 6 in the rotor outer diameter direction is provided.

The cooling gas F is introduced into the subslot 3 from the rotor core end 11 as shown in FIG. 16 due to the centrifugal fan effect due to the rotation of the rotor, flows toward the axial center portion of the rotor core 1, and individually flows. Branches into the coil ventilation passage 7 of the above. The cooling gas F flowing through each coil ventilation passage 7 cools and absorbs the heat generated in the rotor coil 4, and then is discharged from the ventilation passage of the rotor wedge 6.

Japanese Patent No. 354915 Japanese Patent No. 3736192 Japanese Unexamined Patent Publication No. 7-170683

Since the cooling gas in the subslot 3 described above has a large flow rate and a fast flow near the rotor core end 11, the coil ventilation passage 7 is particularly connected to the coil ventilation passage 7 near the rotor core end 11. It flows into the coil ventilation passage 7 along the wall surface on the downstream side of the subslot. At this time, a large branch pressure loss occurs at the cooling gas inlet portion of the coil ventilation passage 7. Specifically, the cooling gas that has flowed into the cooling gas inlet of the coil ventilation passage 7 flows as it is along the wall surface on the downstream side of the subslot of the coil ventilation passage 7, and therefore, as shown in FIG. 17, the coil ventilation passage 7 The flow of the cooling gas is separated from the wall surface on the upstream side of the subslot at the cooling gas inlet of the above, and a vortex or the like is generated, and a large flow path resistance is generated. Due to the pressure loss at this time, the flow rate of the cooling gas F in the coil ventilation passage 7 near the rotor core end 11 is smaller than the flow rate of the cooling gas F in the coil ventilation passage 7 on the center side of the iron core, and the flow rate on the downstream side of the subslot. The flow rate distribution of the cooling gas is greatly biased. Since the temperature of the rotor coil 4 largely depends on the flow rate of the cooling gas flowing through the coil ventilation passage 7, the coil on the rotor core end 11 side where the flow rate of the cooling gas is small is larger than the coil on the iron core center side. Also the temperature rises.

On the other hand, the temperature upper limit of each rotor coil 4 is severely limited by the heat resistance performance of the insulating materials constituting them. Therefore, there is a problem that the cooling gas F in the subslot 3 is excessively flowed in order to secure the flow rate of the cooling gas capable of sufficiently cooling the rotor coil 4 in the coil ventilation passage 7 near the rotor core end 11. .. Further, as the iron core length of the rotary electric machine becomes longer as the capacity of the rotary electric machine increases, the number of coil ventilation passages 7 of the rotor coil 4 also increases in the axial direction, so that the cooling gas F becomes more and more excessive. There is also a problem that it becomes necessary to flow.

The problem to be solved by the present invention is to reduce the separation of the cooling gas flow generated on the wall surface on the upstream side of the subslot at the cooling gas inlet portion of the coil ventilation path, and to enable efficient cooling of the rotor coil. The purpose is to provide a rotor for a rotating electric machine.

The rotor of the rotor electric machine according to the embodiment has a coil slot for accommodating the rotor coil, a subslot for ventilating cooling gas in the rotor axial direction, and a subslot provided in the rotor coil to introduce cooling gas from the subslot. It is provided with a plurality of coil ventilation passages that ventilate in the outer radial direction of the rotor, and the cooling gas is configured to flow into the subslot from the end of the rotor core and further branch into each coil ventilation passage. In the rotor of the rotary electric machine, at least one coil ventilation passage has a flow path width in the rotor rotation direction downstream of the subslot at least at the cooling gas inlet portion of the coil ventilation passage. It is formed so that the side is narrower.

FIG. 5 is a cross-sectional view showing an example of the cross-sectional shape of a part of the rotor of the rotary electric machine according to the first embodiment when the rotor coil 4 is viewed from the outer diameter side. FIG. 5 is a cross-sectional view showing an example of a cross-sectional shape of a part of the rotor of a rotary electric machine according to the same embodiment when the insulating plate 5 is viewed from the outer diameter side. FIG. 5 is a cross-sectional view showing an example of the cross-sectional shape of a part of the rotor of the rotary electric machine according to the same embodiment when the rotor wedge 6 is viewed from the outer diameter side. FIG. 5 is a cross-sectional view showing an example of a cross-sectional shape of a part of a rotor of a rotary electric machine according to the same embodiment when the rotor coil 4, the insulating plate 5, the rotor wedge 6, and the like are viewed from the circumferential direction. FIG. 5 is a cross-sectional view showing an example of a cross-sectional shape of another portion of the rotor of a rotary electric machine according to the same embodiment when the rotor coil 4, the insulating plate 5, the rotor wedge 6, and the like are viewed from the circumferential direction. FIG. 5 is a cross-sectional view showing an example of the cross-sectional shape of a part of the rotor of the rotary electric machine according to the second embodiment when the rotor coil 4 is viewed from the outer diameter side. FIG. 5 is a cross-sectional view showing an example of a cross-sectional shape of a part of the rotor of a rotary electric machine according to a third embodiment when the rotor coil 4 is viewed from the outer diameter side. Of the rotor coil portions 4a and 4b constituting the rotor coil 4 in the rotor of the rotary electric machine according to the fourth embodiment, the cross-sectional shape of a portion of the rotor coil portion 4a when viewed from the outer diameter side. A cross-sectional view showing an example. An example of the cross-sectional shape of another part of the rotor coil portions 4a and 4b constituting the rotor coil 4 in the rotor of the rotary electric machine according to the same embodiment when the rotor coil portion 4b is viewed from the outer diameter side. Sectional view which shows. An example of the cross-sectional shape of a part of the rotor of the rotary electric machine according to the same embodiment when the rotor coil portions 4a and 4b, the insulating plate 5, the rotor wedge 6 and the like constituting the rotor coil 4 are viewed from the circumferential direction. Sectional view which shows. The cross-sectional shape of another part when the rotor coil portions 4a and 4b, the insulating plate 5, the rotor wedge 6 and the like constituting the rotor coil 4 in the rotor of the rotary electric machine according to the same embodiment are viewed in the circumferential direction. A cross-sectional view showing an example. There are times when the rotor coil portions 4c, 4d, 4e, 4f, the insulating plate 5, the rotor wedge 6, and the like constituting the rotor coil 4 in the rotor of the rotary electric machine according to the fifth embodiment are viewed in the circumferential direction. The cross-sectional view which shows an example of the cross-sectional shape of a part. Cross-sectional shape of a part of the rotor of the rotary electric machine according to the sixth embodiment when the rotor coil portions 4g, 4h, the insulating plate 5, the rotor wedge 6 and the like constituting the rotor coil 4 are viewed in the circumferential direction. A cross-sectional view showing an example. The cross-sectional view which shows an example of the cross-sectional shape when the rotor core is seen in the rotor axis direction. FIG. 4 is an enlarged cross-sectional view showing the periphery of the coil slot shown in FIG. A cross-sectional view showing an example of a cross-sectional shape when the rotor (the range from the end of the iron core on one side to the vicinity of the center of the iron core) is viewed in the direction of rotation of the rotor. It is a figure which shows a mode that the flow of a cooling gas is largely separated from the wall surface on the upstream side of a subslot at a cooling gas inlet part of a coil ventilation path in the prior art, and a vortex is generated.

Hereinafter, embodiments will be described with reference to the drawings.

(First Embodiment)
First, the first embodiment will be described with reference to FIGS. 1 to 5. Here, FIGS. 14 to 17 described above are also referred to as appropriate.

The basic structure of the rotor of the rotary electric machine according to the first embodiment is the same as that shown in FIGS. 14 to 16, but the shape of the coil ventilation passage 7 in the rotor coil 4 is different.

1 to 3 show rotor coils 4, insulating plates 5, and rotor wedges 6 that form a ventilation path for ventilation from the subslot to the outer diameter side of the rotor in the rotor of the rotary electric machine according to the first embodiment. It is sectional drawing which shows an example of the cross-sectional shape of a certain part when viewed from the outer diameter side.

On the other hand, FIG. 4 is a cross-sectional view showing an example of the cross-sectional shape of a certain portion of the rotor coil 4, the insulating plate 5, the rotor wedge 6, and the like when viewed from the circumferential direction. FIG. 5 is a cross-sectional view showing an example of the cross-sectional shape of another portion of the rotor coil 4, the insulating plate 5, the rotor wedge 6, and the like when viewed in the circumferential direction.

In each figure, P represents the rotation direction of the rotor, A represents the axial direction of the rotor, and R represents the outer diameter direction or the inner diameter direction of the rotor.

The cross section of the rotor coil 4 shown in FIG. 1 corresponds to the cross section of the portion shown by the arrow I in FIGS. 4 and 5. The cross section of the insulating plate 5 shown in FIG. 2 corresponds to the cross section of the portion shown in arrow view II of FIGS. 4 and 5. The cross section of the rotor wedge 6 shown in FIG. 3 corresponds to the cross section of the portion shown in arrow III in FIGS. 4 and 5.

On the other hand, the cross sections of the rotor coil 4, the insulating plate 5, and the rotor wedge 6 shown in FIG. 4 correspond to the cross sections of the portions shown in the arrows IV of FIGS. 1 to 3. The cross section of the rotor coil 4, the insulating plate 5, and the rotor wedge 6 shown in FIG. 5 corresponds to the cross section of the portion shown by the arrow V in FIGS. 1 to 3.

As shown in FIG. 14, a plurality of coil slots 2 are arranged at predetermined intervals in the circumferential direction of the rotor core 1, and sub-slots 3 are provided on the inner peripheral side of each coil slot 2. .. The rotor coil 4 is housed in each coil slot 2.

Further, as shown in FIGS. 15 and 16, each subslot 3 is provided on the rotor shaft 10 and constitutes a cooling gas flow path extending in the rotor axial direction on the inner diameter side of each coil slot 2. doing. On the rotor outer diameter side of each subslot 3, a plurality of coil ventilation passages 7 (ventilation flow paths of the rotor coil 4) extending in the rotor radial direction so as to communicate with the subslot 3 are arranged on the rotor shaft. It is provided at predetermined intervals in the direction. On the rotor outer diameter side of each coil ventilation passage 7, a ventilation passage that penetrates the insulating material 5 and the rotor wedge 6 in the rotor outer diameter direction is provided.

The cooling gas F is introduced into the subslot 3 from the rotor core end 11 as shown in FIG. 16 due to the centrifugal fan effect due to the rotation of the rotor, flows toward the axial center portion of the rotor core 1, and individually flows. Branches into the coil ventilation passage 7 of the above. The cooling gas F flowing through each coil ventilation passage 7 cools and absorbs the heat generated in the rotor coil 4, and then is discharged from the ventilation passage of the rotor wedge 6.

In the present embodiment, of the plurality of coil ventilation passages 7 shown in FIG. 16, at least the coil ventilation passage 7 closest to the rotor core end 11 is at least the cooling gas inlet portion (subslot 3) of the coil ventilation passage 7. At the end on the side), the flow path width in the rotor rotation direction is formed so as to be narrower on the downstream side of the subslot than on the upstream side of the subslot.

FIG. 1 shows a case where the flow path width Wd in the rotor rotation direction on the downstream side of the subslot is narrower than the flow path width Wu in the rotor rotation direction on the upstream side of the subslot of the coil ventilation passage 7. Illustrate.

The coil ventilation passage 7 as shown in FIG. 1 may be formed only on one coil ventilation passage located closest to the rotor core end 11, but the present invention is not limited to this. It may be applied to a predetermined number of coil ventilation passages close to the iron core end 11, or may be applied to all existing coil ventilation passages. In that case, the closer the coil ventilation path is to the rotor core end 11, the larger the difference between the flow path width Wd and the flow path width Wu (the flow path width Wu is wider and the flow path width Wd is narrower) as shown in FIG. As the coil ventilation path farther from the rotor core end 11, the difference between the flow path width Wd and the flow path width Wu becomes smaller, and individual coil ventilation is performed according to the distance from the rotor core end 11. It may be configured so that the shape of the road changes stepwise.

Further, the coil ventilation passage 7 as shown in FIG. 1 may be formed only at the cooling gas inlet portion (end portion on the subslot 3 side) of the coil ventilation passage 7, but the present invention is not limited to this. It may be applied over the entire range from the cooling gas inlet portion (end portion on the subslot 3 side) of the coil ventilation passage 7 to the cooling gas outlet portion (end portion on the insulating plate 5 side) of the coil ventilation passage 7. FIGS. 1 to 5 exemplify the case where the above-mentioned formation is performed over the entire range from the cooling gas inlet portion to the cooling gas outlet portion of the coil ventilation passage 7.

As shown in FIGS. 2 and 3, the cross-sectional shape of the ventilation hole 21 of the insulating material 5 and the cross-sectional shape of the ventilation hole 22 of the rotor wedge 6 may be a generally adopted circular shape. It is not limited. The shape and size of the ventilation holes 21 and 22 may be appropriately modified.

In the examples of FIGS. 2 and 3, the maximum flow path width W2 in the rotor rotation direction of the ventilation hole 21 of the insulating material 5 is larger than the maximum flow path width W3 in the rotor rotation direction of the ventilation hole 22 of the rotor wedge 6. Wide, the maximum flow path width L2 in the rotor axis direction of the ventilation hole 21 of the insulating material 5 is formed to be wider than the maximum flow path width L1 in the rotor axis direction of the ventilation hole 22 of the rotor wedge 6. There is. In this case, the maximum flow path width L1 in the rotor axis direction of the coil ventilation path 7 shown in FIG. 1 is wider than the maximum flow path width L2 in the rotor axis direction of the ventilation hole 21 of the insulating material 5, but the coil. The flow path width Wu in the rotor rotation direction on the upstream side of the subslot of the ventilation path 7 is formed to be narrower than the maximum flow path width W2 in the rotor rotation direction of the ventilation hole 21 of the insulating material 5, and further, the coil ventilation path 7 The flow path width Wd in the rotor rotation direction on the downstream side of the subslot is formed narrower.

The cooling gas F in the subslot 3 has a particularly large flow rate and a high flow velocity in the vicinity of the rotor core end 11 shown in FIG. Therefore, in the conventional configuration, as shown in FIG. 17, a part of the cooling gas F in the subslot 3 branches into the coil ventilation passage 7 as the coil ventilation passage 7 is closer to the rotor core end 11. At the cooling gas inlet portion of the coil ventilation passage 7, the flow of the cooling gas is largely separated from the wall surface on the upstream side of the subslot, and a vortex or the like is generated. On the other hand, according to the configuration of the present embodiment, as shown in FIG. 1, the flow path width Wd on the downstream side of the subslot of the coil ventilation passage 7 is narrower than the flow path width Wu on the upstream side of the subslot. Since there is a step 7a that narrows the road width, a part of the cooling gas collides with the wall surface of the step 7a and flows in the coil ventilation path 7 to the rotor outer diameter side, and the inflow of the cooling gas to the downstream side of the subslot is suppressed. Therefore, in the conventional structure, the cooling gas flows into the region where the flow of the cooling gas is separated from the wall surface on the upstream side of the subslot and a vortex or the like is generated (hereinafter, “peeling region”), and the separated region is reduced. To do.

In the conventional configuration, this peeling region contributes to the generation of a large flow path resistance when a part of the cooling gas F flowing through the subslot 3 branches into the coil ventilation passage 7 and flows in. In the configuration of the embodiment, since the peeling region is reduced, the flow path resistance is reduced, the flow rate of the cooling gas flowing through the coil ventilation passage 7 is increased, and the rotor coil 4 is efficiently cooled.

Further, according to the configuration of the present embodiment, since the flow path width Wd on the downstream side of the subslot of the coil ventilation passage 7 is narrower than the flow path width Wu on the upstream side of the subslot, the sub in the coil ventilation passage 7 The bias of the flow rate distribution that is largely biased toward the downstream side of the slot is also eliminated, and the pressure loss when passing through the ventilation hole 21 of the insulating material 5 and the ventilation hole 22 of the rotor wedge 6 is also reduced. Therefore, even with such an action, the flow rate of the cooling gas flowing through the coil ventilation passage 7 increases, and the rotor coil 4 is efficiently cooled.

Further, according to the configuration of the present embodiment, the coil ventilation passage 7 located on the upstream side of the subslot where the flow velocity of the cooling gas in the subslot 3 is fast has a large effect of reducing the peeling region and also has a large effect of reducing the pressure loss. The bias of the cooling gas flow rate distribution among the plurality of coil ventilation passages 7 is also eliminated, and the individual rotor coils 4 are efficiently cooled.

As described above, according to the present embodiment, the cooling gas can be efficiently passed through the coil ventilation path, and as a result, the flow rate of the cooling gas in the coil ventilation path is increased, and the rotor coil is efficiently passed. It is possible to provide a rotor of a rotating electric machine that can be cooled and thus allows a larger field current value.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. In the following, the description of the parts common to the first embodiment will be omitted, and the parts different from the first embodiment will be mainly described.

FIG. 6 is a cross-sectional view showing an example of the cross-sectional shape of a part of the rotor of the rotary electric machine according to the second embodiment when the rotor coil 4 having the coil ventilation passage 7 is viewed from the outer diameter side.

Regarding the point that the flow path width Wd in the rotor rotation direction on the downstream side of the subslot is narrower than the flow path width Wu in the rotor rotation direction on the upstream side of the subslot of the coil ventilation passage 7. Although it is common to the first embodiment described above, the detailed structure of the inner wall surface of the coil ventilation passage 7 is different from that of the first embodiment described above.

In the first embodiment described above, of the plurality of coil ventilation passages 7 shown in FIG. 16, at least the coil ventilation passage 7 closest to the rotor core end 11 is provided with one stage as shown in FIG. An example has been given in which the flow path width in the rotor rotation direction is narrowed from the upstream side of the subslot to the downstream side of the subslot by providing the step 7a, but in the second embodiment, By providing a plurality of steps 7b with respect to the coil ventilation passage 7 as shown in FIG. 6, the flow path width in the rotor rotation direction gradually increases from the subslot upstream side to the subslot downstream side. It is formed to be narrow.

According to the configuration of the present embodiment, as shown in FIG. 6, the flow path width of the coil ventilation passage 7 is from the flow path width Wu in the rotor rotation direction on the upstream side of the subslot to the rotor rotation direction on the downstream side of the subslot. Since the cooling gas is configured to be gradually narrowed to the flow path width Wd by a plurality of steps 7b, the cooling gas flows in the coil ventilation path 7 toward the outer diameter side of the rotor while colliding with the wall surfaces of the individual steps 7b. .. Rather than providing a single step 7a as shown in FIG. 1, providing a plurality of smaller steps as shown in FIG. 6 suppresses the separation of the flow from the wall surface caused by the step to be small and further suppresses the generation of vortices and the like. Therefore, the flow path resistance can be further reduced, and the cooling gas can pass through the coil ventilation path more efficiently.

As described above, according to the present embodiment, the cooling gas can be more efficiently passed through the coil ventilation path, and as a result, the flow rate of the coil ventilation path is further increased, and the rotor coil is made more efficient. Can be cooled to.

(Third Embodiment)
Next, a third embodiment will be described with reference to FIG. 7. In the following, the description of the parts common to the second embodiment will be omitted, and the parts different from the second embodiment will be mainly described.

FIG. 7 is a cross-sectional view showing an example of the cross-sectional shape of a part of the rotor of the rotary electric machine according to the third embodiment when the rotor coil 4 having the coil ventilation passage 7 is viewed from the outer diameter side.

The above-mentioned point that the flow path width Wd in the rotor rotation direction on the downstream side of the subslot is formed to be narrower than the flow path width Wu in the rotor rotation direction on the upstream side of the subslot of the coil ventilation passage 7. Although it is common to the second embodiment described above, the detailed structure of the inner wall surface of the coil ventilation passage 7 is different from that of the second embodiment described above.

In the second embodiment described above, among the plurality of coil ventilation passages 7 shown in FIG. 16, at least the coil ventilation passage 7 closest to the rotor core end 11 is provided with a plurality of stages as shown in FIG. An example of the case where the flow path width in the rotor rotation direction is formed so as to be gradually narrowed from the subslot upstream side to the subslot downstream side by providing the step 7b has been described. In the embodiment, as shown in FIG. 7, the coil ventilation path 7 is not provided with a step, and the flow path width in the rotor rotation direction is continuously narrowed from the subslot upstream side to the subslot downstream side. Is formed to be.

According to the configuration of the present embodiment, as shown in FIG. 7, the flow path width of the coil ventilation passage 7 is from the flow path width Wu in the rotor rotation direction on the upstream side of the subslot to the rotor rotation direction on the downstream side of the subslot. Since the cooling gas is configured to be continuously narrowed to the flow path width Wd, the cooling gas flows in the coil ventilation passage 7 toward the outer diameter side of the rotor while being throttled by the wall surface of the coil ventilation passage 7. Rather than providing a plurality of steps 7b as shown in FIG. 6, eliminating the steps as shown in FIG. 7 further suppresses the separation of the flow from the wall surface caused by the steps and further suppresses the generation of vortices and the like. Therefore, the flow path resistance can be further reduced, and the cooling gas can be more efficiently passed through the coil ventilation path.

As described above, according to the present embodiment, the cooling gas can be passed through the coil ventilation path more efficiently, and as a result, the flow rate of the coil ventilation path is further increased, and the rotor coil is further increased. It can be cooled more efficiently.

(Fourth Embodiment)
Next, a fourth embodiment will be described with reference to FIGS. 8 to 11. In the following, the description of the parts common to the first embodiment will be omitted, and the parts different from the first embodiment will be mainly described.

FIG. 8 shows the rotor coil portion 4a of the rotor coil portions 4a and 4b constituting the rotor coil 4 having the coil ventilation path 7 in the rotor of the rotary electric machine according to the fourth embodiment from the outer diameter side. It is sectional drawing which shows an example of the cross-sectional shape of a certain part when seen. FIG. 9 is a cross-sectional view showing an example of the cross-sectional shape of another portion of the rotor coil portions 4a and 4b constituting the rotor coil 4 when the rotor coil portion 4b is viewed from the outer diameter side. ..

On the other hand, FIG. 10 is a cross-sectional view showing an example of the cross-sectional shape of a part of the rotor coil portions 4a and 4b, the insulating plate 5, the rotor wedge 6 and the like constituting the rotor coil 4 when viewed from the circumferential direction. Is. FIG. 11 is a cross-sectional view showing an example of the cross-sectional shape of another portion when the rotor coil portions 4a and 4b, the insulating plate 5, the rotor wedge 6 and the like constituting the rotor coil 4 are viewed in the circumferential direction. is there.

The cross section of the rotor coil portion 4a shown in FIG. 8 corresponds to the cross section of the portion shown in arrow VIII of FIGS. 10 and 11. The cross section of the rotor coil portion 4a shown in FIG. 9 corresponds to the cross section of the portion shown by the arrow IX in FIGS. 10 and 11.

On the other hand, the cross section of the rotor coil 4, the insulating plate 5, and the rotor wedge 6 shown in FIG. 10 corresponds to the cross section of the portion shown by the arrow X in FIGS. 8 and 9. The cross section of the rotor coil 4, the insulating plate 5, and the rotor wedge 6 shown in FIG. 11 corresponds to the cross section of the portion shown in the arrow XI of FIGS. 8 and 9, respectively.

In the present embodiment, the coil ventilation passage 7 is formed so that the flow path width in the rotor rotation direction on the downstream side of the subslot is wider on the rotor outer diameter side than on the rotor inner diameter side.

In the first embodiment described above, the flow path width Wd in the rotor rotation direction on the downstream side of the subslot is narrower than the flow path width Wu in the rotor rotation direction on the upstream side of the subslot of the coil ventilation passage 7. When the formation is performed over the entire range from the cooling gas inlet portion (end portion on the subslot 3 side) of the coil ventilation passage 7 to the cooling gas outlet portion (end portion on the insulating plate 5 side) of the coil ventilation passage 7. An example has been given, but in the fourth embodiment, the above-mentioned formation is performed on the rotor coil on the rotor outer diameter side (insulating plate 5 side) of the rotor coil portions 4a and 4b constituting the rotor coil 4. It is not applied to the portion 4b, but is applied only to the rotor coil portion 4a on the rotor inner diameter side (subslot 3 side).

As shown in FIG. 8, the coil ventilation passage 7 of the rotor coil portion 4a on the rotor inner diameter side (subslot 3 side) is downstream of the flow path width Wu in the rotor rotation direction on the subslot upstream side. The flow path width Wd in the rotor rotation direction on the side is formed to be narrower.

On the other hand, as shown in FIG. 9, the coil ventilation passage 7 of the rotor coil portion 4b on the rotor outer diameter side (insulating plate 5 side) is subs with the flow path width Wu in the rotor rotation direction on the upstream side of the subslot. The flow path width Wd in the rotor rotation direction on the downstream side of the slot is the same, and the flow path width between the two is also the same.

Further, in the examples of FIGS. 8 and 9, in order to further improve the cooling efficiency, the flow velocity of the cooling gas passing through the coil ventilation passage 7 in the rotor coil portion 4a and the coil ventilation passage 7 in the rotor coil portion 4b are passed. The flow path area of the coil ventilation path 7 in the rotor coil portion 4a and the flow path area of the coil ventilation path 7 in the rotor coil portion 4b are formed to be the same so that the flow velocity of the cooling gas is the same. ing. However, the present invention is not limited to this example.

According to the configuration of the present embodiment, when the coil ventilation path 7 is directed from the rotor inner diameter side to the rotor outer diameter side, the flow path width Wd in the rotor rotation direction on the downstream side of the subslot widens, and the downstream side of the subslot. Since the flow path area of the cooling gas F is expanded and the flow of the cooling gas F is slowed down, the pressure loss can be further reduced.

As described above, according to the present embodiment, the pressure loss can be further reduced, and as a result, the flow rate of the coil ventilation path can be further increased, and the rotor coil can be cooled more efficiently.

(Fifth Embodiment)
Next, a fifth embodiment will be described with reference to FIG. In the following, the description of the parts common to the fourth embodiment will be omitted, and the description will be focused on the different parts.

FIG. 12 shows the rotor coil portions 4c, 4d, 4e, 4f, the insulating plate 5, and the rotor wedge 6 constituting the rotor coil 4 having the coil ventilation passage 7 in the rotor of the rotary electric machine according to the fifth embodiment. It is sectional drawing which shows an example of the cross-sectional shape of a certain part when seen in the circumferential direction.

In the first embodiment described above, as shown in FIG. 11, the coil ventilation passage 7 has one step of narrowing the flow path width in the rotor rotation direction from the upstream side to the downstream side of the subslot 3. However, in the fifth embodiment, as shown in FIG. 12, the coil ventilation passage 7 has a rotor coil portion 4c, 4d, 4e, 4f in this order from the rotor inner diameter side. A portion that narrows the flow path width in the rotor rotation direction from the subslot upstream side to the subslot downstream side is formed so as to move stepwise toward the subslot downstream side toward the outer diameter side.

According to the configuration of the present embodiment, the flow path width of the coil ventilation passage 7 gradually expands from the rotor inner diameter side to the rotor outer diameter side, so that the flow path is compared with the case of the fourth embodiment. The pressure loss that occurs when the area is expanded can be further reduced.

As described above, according to the present embodiment, the pressure loss can be further reduced, and as a result, the flow rate of the coil ventilation path can be further increased, and the rotor coil can be cooled more efficiently.

(Sixth Embodiment)
Next, a sixth embodiment will be described with reference to FIG. In the following, the description of the parts common to the fifth embodiment will be omitted, and the parts different from the fifth embodiment will be mainly described.

FIG. 13 shows the rotor coil portions 4g, 4h, the insulating plate 5, the rotor wedge 6, and the like constituting the rotor coil 4 having the coil ventilation path 7 in the rotor of the rotary electric machine according to the sixth embodiment in the circumferential direction. It is sectional drawing which shows an example of the cross-sectional shape of a certain part when seen in.

In the fifth embodiment described above, as shown in FIG. 12, the coil ventilation passage 7 is arranged in the order of the rotor coil portions 4c, 4d, 4e, and 4f from the rotor inner diameter side to the rotor outer diameter side. An example was given in which a portion that narrows the flow path width in the rotor rotation direction from the upstream side of the subslot to the downstream side of the subslot is formed so as to move stepwise in the downstream direction of the subslot. In the embodiment, as shown in FIG. 13, the coil ventilation passage 7 changes the flow path width in the rotor rotation direction from the rotor inner diameter side to the rotor outer diameter side from the subslot upstream side to the subslot downstream side. It is formed so that there is a range in which the narrowed portion continuously moves in the downstream direction of the subslot.

In the example of FIG. 13, of the rotor coil portions 4g and 4h constituting the rotor coil 4, the flow path width in the rotor rotation direction is narrowed from the subslot upstream side to the subslot downstream side in the rotor coil portion 4g. The portion is formed so that there is a range in which the portion continuously moves in the downstream direction of the subslot.

According to the configuration of the present embodiment, the flow path width of the coil ventilation passage 7 continuously expands from the rotor inner diameter side to the rotor outer diameter side, so that the flow flows as compared with the case of the fifth embodiment. The pressure loss that occurs when the road area is expanded can be further reduced.

As described above, according to the present embodiment, the pressure loss can be further reduced, and as a result, the flow rate of the coil ventilation path can be further increased, and the rotor coil can be cooled more efficiently. ..

As described in detail above, according to each embodiment, the separation of the cooling gas flow generated on the wall surface on the upstream side of the subslot at the cooling gas inlet portion of the coil ventilation path is reduced, and the rotor coil is efficiently cooled. It is possible to provide a rotor of a rotating electric machine that makes it possible to do so.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... Rotor iron core, 2 ... Coil slot, 3 ... Subslot, 4 ... Rotor coil, 5 ... Insulation plate, 6 ... Rotor wedge, 7 ... Coil ventilation path, 9 ... Holding ring, 10 ... Rotor shaft, 11 ... Rotor core end, 12 ... Axial flow path, 21, 22 ... Ventilation hole.

Claims (6)

A coil slot for accommodating the rotor coil, a subslot for ventilating cooling gas in the rotor axial direction, and a plurality of subslots provided in the rotor coil for introducing cooling gas from the subslot to ventilate in the rotor outer diameter direction. In a rotor of a rotating electric machine, which is provided with a coil ventilation path of the above, and is configured such that cooling gas flows into the subslot from the end of the rotor core and further branches into each coil ventilation path.
At least one coil ventilation path has a flow path width in the rotor rotation direction narrower on the downstream side of the subslot than on the upstream side of the subslot at least at the cooling gas inlet portion of the coil ventilation path. Is formed,
Rotor of rotating electric machine. The flow path width in the rotor rotation direction is formed so as to gradually narrow from the upstream side to the downstream side of the subslot.
The rotor of the rotary electric machine according to claim 1. The flow path width in the rotor rotation direction is formed so as to be continuously narrowed from the upstream side to the downstream side of the subslot.
The rotor of the rotary electric machine according to claim 1. The at least one coil ventilation path is formed so that the flow path width in the rotor rotation direction on the downstream side of the subslot is wider on the rotor outer diameter side than on the rotor inner diameter side.
The rotor of a rotary electric machine according to any one of claims 1 to 3. In the at least one coil ventilation path, a portion of the subslot that narrows the flow path width in the rotor rotation direction from the upstream side to the downstream side of the subslot as it goes from the inner diameter side of the rotor to the outer diameter side of the rotor. It is formed to move in stages in the downstream direction,
The rotor of the rotary electric machine according to claim 1. In the at least one coil ventilation path, a portion of the subslot that narrows the flow path width in the rotor rotation direction from the upstream side to the downstream side of the subslot as it goes from the inner diameter side of the rotor to the outer diameter side of the rotor. It is formed so that there is a range that moves continuously in the downstream direction.
The rotor of the rotary electric machine according to claim 1.