JP3590849B2 - Rotating electric machine rotor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotor of a rotating electric machine such as a generator or a motor, and more particularly to a rotor suitable for a rotating electric machine that operates at high speed.
[0002]
[Prior art]
For example, a rotor of a rotating electric machine that operates at a high speed, such as a turbine-driven generator, is usually made to have an extremely large axial dimension compared to its diameter.
FIG. 8 shows an example of a rotor of such a rotating electric machine, which is shown here as a rotor of a so-called rotating field type synchronous generator, and has a substantially cylindrical shape forming a body. It comprises a rotor core 1 and a rotating shaft 2 extending on both sides on the central axis of the rotor core 1.
[0003]
The rotor core 1 is integrally formed including the rotating shaft 2 by forging, for example, from a ferromagnetic material such as steel, and a plurality of grooves are radially provided on the surface of its body. By providing a winding in the groove and supplying a field current, it is configured as a rotor of a rotating field type rotating electric machine.
[0004]
Here, the grooves formed in the rotor core 1 are shown as slots 7 in FIG. 9, and at this time, a sub-slot 6 is further provided below each slot 7. Thus, a passage (axial duct) in the direction of the rotation axis is provided for a cooling medium such as air or hydrogen.
[0005]
From both ends of the body of the rotor core 1, the ends of the rotor windings 3 protrude from the slots 7, where a cylindrical retaining ring 4 is shrink-fitted. This receives a large centrifugal force acting on the end, and holds the end so that the end is not deformed.
[0006]
Further, a cooling medium flow fan 5 is mounted on both sides of the rotating shaft 2 so that the cooling medium is pressurized to flow the cooling medium.
The rotating electric machine rotor is supported on both sides of the rotating shaft 2 by a bearing device (not shown) and stably at a predetermined position with respect to a stator (not shown) while maintaining a predetermined gap. It is configured to be able to rotate at high speed.
[0007]
Next, the configuration in the slot 7 will be described by adding FIG. 10 to FIG. Here, first, FIG. 9A is a cross-sectional view as viewed from a direction perpendicular to the center line of the rotating shaft 2 in FIG. 8, and FIG. 9B is a cross-sectional view as viewed from the center line direction. Next, FIG. 10 is an exploded perspective view showing a stored item taken out of the slot 7.
[0008]
As is clear from FIGS. 9 and 10, the slot 7 has a wedge 8 for holding the centrifugal force acting on the rotor winding 3 and an insulation between the upper part of the rotor winding 3 and the wedge 8. The retainer block 9, the rotor winding 3, the bottom insulating material 10 for maintaining insulation between the lower part of the rotor winding 3 and the rotor core 1, and the sub-slot cover 11 are provided with the rotor core 1. Are stacked and stored in order from the outside in the radial direction.
[0009]
Here, the rotor winding 3 is composed of a plurality of conductor strips arranged side by side in the radial direction, and an interlayer insulating material 12 is sandwiched between these conductor strips.
Further, a slot armor 13 is provided on the inner surface of the slot 7, so that insulation between the side surface of the rotor winding 3 and the rotor core 1 is maintained.
[0010]
At this time, the wedge 8 and the crease block 9, the rotor winding (conductor strip) 3, the interlayer insulating material 12, the bottom insulating material 10, and the sub-slot cover 11 are respectively provided in the axial direction of the rotor. A plurality of ventilation holes are provided side by side.
[0011]
Here, these ventilation holes are respectively a wedge ventilation hole 14, a crease block block ventilation hole 15, a rotor winding ventilation hole 16, an interlayer insulation ventilation hole 17, a bottom insulating ventilation hole 18, and a slot cover cover ventilation hole 19. A plurality of passages called radial ducts through which the cooling medium flows in the slots 7 in the radial direction are formed side by side in the rotation axis direction by the ventilation holes 14 to 19. I have.
[0012]
In this figure, the rotor winding ventilation holes 16 formed in the rotor winding (conductor strip) 3 are oriented in a direction perpendicular to the rotor axis direction, that is, in the rotor winding (conductor strip) 3. It has two rows of elliptical apertures arranged in the width direction, but there may be one row.
[0013]
FIG. 11 shows a flow path of the cooling medium in the rotor. The cooling medium pressurized by the fan 5 first flows into the sub-slot 6 as shown by the arrow, and It receives centrifugal force while traveling in the axial direction, and branches into the plurality of radial ducts described above.
[0014]
The cooling medium branched into the radial ducts passes from the sub-slot cover ventilation holes 19 forming the respective radial ducts to the bottom insulation ventilation holes 18, the rotor winding ventilation holes 17, the interlayer insulation ventilation holes 16, and the clear pages. The air flows through the respective ventilation holes in the order of the block ventilation holes 15 and the wedge ventilation holes 14, and finally reaches the outer peripheral portion of the rotor core 1, and then flows through the gap between the rotor and the stator.
[0015]
Here, in the rotor of the rotating electric machine according to the above-described conventional technology, as shown in FIG. 10, the wedge ventilation holes 14, the crease block ventilation holes 15, the rotor winding ventilation holes 16, and the interlayer insulating ventilation holes. The number of the ventilation holes 17 is the same at the same pitch in the direction of the rotation axis. On the other hand, as for the bottom insulating ventilation holes 18 and the sub-slot cover ventilation holes 19, as shown in FIG. The holes are provided in a small number, one of four holes, that is, at a large pitch.
[0016]
[Problems to be solved by the invention]
The above prior art does not consider the flow distribution of the cooling medium between a plurality of radial ducts arranged in the direction of the rotation axis, and has a problem in cooling the rotor.
Here, in the prior art, as is apparent from FIG. 10, the bottom insulating ventilation hole 18 and the sub-slot cover ventilation hole 19 are provided at a ratio of one to a plurality of rotor winding ventilation holes 16. I have.
[0017]
As a result, in the prior art, the ventilation resistance when the cooling medium flowing in the sub-slot 6 branches into the radial duct is different at each position, so that the flow rate of the cooling medium in each of the rotor winding ventilation holes 16 is different. Causes a difference between the radial ducts, for example, as shown by the characteristic (1) in FIG. 12, and thus causes a problem in cooling the rotor.
[0018]
SUMMARY OF THE INVENTION An object of the present invention is to provide a rotor of a rotating electric machine that can appropriately distribute a flow rate of a cooling medium with a simple configuration and sufficiently improve cooling performance.
[0019]
[Means for Solving the Problems]
The object is to provide at least a wedge, a crease block, a conductor strip for rotor winding, an interlayer insulating material, a bottom insulating material, a subslot cover, and a slot armor in a rotor core slot. In a rotor of a rotating electrical machine in which a plurality of radial ducts for cooling medium flow are formed by forming a plurality of ventilation holes arranged in the rotor axis direction on a member, the rotor core is rotated. It is divided into at least one section in the child axis direction, two sections at the other end, and one section at the center, and is formed on the bottom insulating material and the sub-slot cover in each of the members. The pitch in the rotor axis direction of the ventilation holes is formed in a member other than the bottom insulating material and the sub-slot cover in each of the members in the two sections at the one end and the other end. A certain draft The pitch in the axial direction of the rotor is larger than the pitch in the center, and in one section at the center, the rotation of ventilation holes formed in members other than the bottom insulating material and the sub-slot cover in each member This is achieved in such a way that the pitch in the slave axis direction is the same .
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a rotor of a rotating electric machine according to the present invention will be described in detail with reference to the illustrated embodiments.
First, FIG. 1 is a cross-sectional view of a rotating electric machine rotor according to a first embodiment of the present invention, in which a rotor iron core 1 and a rotating shaft 2, a rotor winding 3, a retaining ring 4, and a fan 5 This is the same as the rotating electric machine rotor according to the prior art described with reference to FIG. 8, and therefore, this figure does not show a difference from the prior art.
[0025]
Also in this embodiment, as shown in FIG. 2, a point in which a slot 7 having a sub-slot 6 is provided is the same as the prior art described with reference to FIG.
Here, FIG. 2A is a cross-sectional view of FIG. 1 as viewed from a direction perpendicular to the center line of the rotating shaft 2, and FIG. 2B is a cross-sectional view as viewed from the center line direction. .
[0026]
In the slot 7, a wedge 8, a crease block 9, a rotor winding 3, a bottom insulation 10, and a sub-slot cover 11 are arranged in order from the radial outside of the rotor core 1. , So that this point is the same as the prior art.
[0027]
In addition, the rotor winding 3 is composed of a plurality of conductor strips arranged in the radial direction, an interlayer insulating material 12 is interposed between each of the conductor strips, and an inner surface of the slot 7 is formed. Is provided with a slot armor 13 so that the insulation between the side surface of the rotor winding 3 and the rotor core 1 is maintained.
[0028]
Further, a wedge ventilation hole 14 is formed in the wedge 8, a crease block ventilation hole 15 is formed in the crease block 9, a rotor winding ventilation hole 16 is formed in the rotor winding 3, and an interlayer insulation ventilation hole 17 is formed in the interlayer insulating material 12. Bottom insulating material 10 is provided with a bottom insulating ventilation hole 18, and subslot cover 11 is provided with a subslot cover ventilation hole 19, respectively. This is the same in that radial ducts for allowing the cooling medium to flow in the radial direction in 7 are formed side by side in the rotation axis direction.
[0029]
Here, FIG. 3 is an exploded perspective view showing the stored contents taken out from the slot 7 similarly to FIG. 10 used for the description of the prior art, and is shown in FIG. 3 and FIG. As described above, the rotor according to this embodiment is different from the rotor according to the prior art in that the bottom insulating material 10 and the bottom insulating ventilation holes 18 and the sub slot cover ventilation holes provided in the sub slot cover 11 are provided. There are 19 pitches.
[0030]
That is, in this embodiment, as apparent from FIGS. 2A and 3, the bottom insulating ventilation holes 18 and the sub-slot cover ventilation holes 19 are formed by the wedge ventilation holes 14, the crease block ventilation holes 15, and the rotation thereof. The individual windings 16 are individually formed in a one-to-one correspondence with respect to the child winding ventilation holes 16, whereas in the prior art, as is apparent from FIGS. For the four ventilation holes 16, one bottom insulation ventilation hole 18 and one sub-slot cover ventilation hole 19 are provided, which is different in this point.
[0031]
As described above, the bottom insulating ventilation holes 18 and the sub-slot cover ventilation holes 19 correspond one-to-one with the two rows of rotor winding ventilation holes 16 provided in the rotor winding 3. If provided separately, all of the plurality of radial ducts formed by the ventilation holes 14 to 19 are formed as independent passages from the sub-slot 6 to the periphery of the rotor 1.
[0032]
Therefore, according to this embodiment, the ventilation resistance when the cooling medium flowing in the sub-slot 6 branches into the radial duct can be made equal in each radial duct. As a result, for example, the characteristic (2) in FIG. As shown by, a substantially uniform distribution of the flow rate of the cooling medium in the rotation axis direction is obtained, and the cooling performance of the rotor can be improved.
[0033]
By the way, in order to obtain a substantially uniform distribution of the flow rate of the cooling medium in the rotation axis direction, it is not always necessary to configure as in the above-described embodiment, and the ventilation holes in the rotor axis direction are not necessarily required. It is sufficient that the pitch is at least the same in the rotor winding 3, the bottom insulation 10, and the subslot cover 11.
[0034]
Further, in this embodiment, the case where the rotor winding ventilation holes 16 provided in the rotor winding 3 are arranged in two rows has been described.
Next, another embodiment of the present invention will be described.
[0035]
First, FIGS. 4 and 5 show a second embodiment of the present invention. The difference between this rotating electric machine rotor and the first embodiment described with reference to FIGS. As shown, the rotor core 1 is divided into a plurality of portions in the axial direction, and the bottom insulating material 10 and the bottom insulating ventilation holes 18 provided in the sub-slot cover 11 in each section and the sub-slot cover ventilation are provided. The point is that the pitch of the holes 19 is changed.
[0036]
That is, in this embodiment, the two sections L _c with the rotor core 1 at one end and the other end in the axial direction, divided into three sections of a single interval L _d in the middle, both ends in the side section Lc, in FIG. 5 (a), constructed as shown as C part enlarged cross-section, the central section L _d, in FIG. 5 (b), as shown as D part enlarged sectional It is composed.
[0037]
Here, first, in the section Lc, as shown in FIG. 5A, as in the first embodiment shown in FIG. 2A, the bottom insulating ventilation holes 18 and the sub-slot cover ventilation holes are provided. Numerals 19 are individually provided in one-to-one correspondence with the rotor winding ventilation holes 16 provided in the rotor winding 3. Therefore, in this case, in the section _Lc , the state in the slot 7 is as shown in FIG.
[0038]
Next, the central segments L _d, as shown in FIG. 5 (b), as in the prior art shown in FIG. 9 (a), the rotor winding is provided on the rotor winding 3 For four of the ventilation holes 16, one bottom insulation ventilation hole 18 and one subslot cover ventilation hole 19 are provided. Therefore, in this case, the interval L _d, the state in the slot 7 would have become as shown in FIG. 10.
[0039]
Therefore, according to the second embodiment, the flow rate of the cooling medium in the rotor winding ventilation holes 16 can be locally increased or decreased in the axial direction of the rotor, and the section L can be changed according to the cooling state of the rotor. by changing the length of the _c and the section L _d, it is possible to always properly correspond to the temperature distribution in need, can be also sufficiently improved cooling performance of the rotor.
[0040]
In this case, the interval L _c and interval L _d, may be carried out in reverse state in the slot 7, the length ratio of the rate and interval L _c between the length of a section L _c and interval L _d is , Can be set and implemented arbitrarily.
[0041]
In this embodiment, the present invention can also be applied to a case where there are three or more sections having different ventilation hole pitches.
Further, it goes without saying that the second embodiment can also be applied to the case where the rotor winding ventilation holes 16 provided in the rotor winding are in one row.
[0042]
Next, FIGS. 6 and 7 show a third embodiment of the present invention. In the third embodiment, too, the rotor core 1 is divided into a plurality of portions in the axial direction. The second embodiment is the same as the second embodiment in that the pitch between the bottom insulating ventilation hole 18 and the sub-slot cover ventilation hole 19 provided in the insulating material 10 and the sub-slot cover 11 is changed.
[0043]
The third embodiment differs from the second embodiment only in that the pitch of the sub-slot cover ventilation holes 19 provided in the sub-slot cover 11 housed in the slot 7 is different. changing the interval _{L c} and interval _{L d,} a bottom insole insulating vents 18 of Sokoshiki insulating material 10 lies in that the same in a section _{L c} and interval _{L d.}
[0044]
Therefore, according to the third embodiment as well, the flow rate of the cooling medium in the rotor winding ventilation holes 16 can be locally increased or decreased in the axial direction of the rotor, and the section L _c according to the cooling state of the rotor. and changing the length of the interval L _d, it is possible to always properly correspond to the temperature distribution in need, it can be also sufficiently improved cooling performance of the rotor.
[0045]
In this case, the interval L _c and interval L _d, may be carried out in reverse state in the slot 7, the length ratio of the rate and interval L _c between the length of a section L _c and interval L _d is , Can be set and implemented arbitrarily.
Further, it goes without saying that the third embodiment can also be applied to the case where the rotor winding ventilation holes 16 provided in the rotor winding are in one row.
[0046]
【The invention's effect】
According to the present invention, the axial distribution of the flow rate of the cooling medium in the rotor of the rotary electric machine can be changed, so that the axial temperature distribution of the rotor can be controlled and the rotor can always be efficiently cooled.
As a result, it is possible to realize high efficiency, low cost, and further downsizing of the rotating electric machine.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a first embodiment of a rotary electric machine rotor according to the present invention.
FIG. 2 is an explanatory diagram showing a configuration inside a slot in the first embodiment of the rotary electric machine rotor according to the present invention.
FIG. 3 is an exploded perspective view showing a configuration in a slot of the rotary electric machine rotor according to the first embodiment of the present invention.
FIG. 4 is a sectional view showing a second embodiment of the rotary electric machine rotor according to the present invention.
FIG. 5 is an explanatory diagram showing a configuration in a slot of a rotary electric machine rotor according to a second embodiment of the present invention.
FIG. 6 is a sectional view showing a third embodiment of the rotating electric machine rotor according to the present invention.
FIG. 7 is an explanatory diagram showing a configuration inside a slot in a rotary electric machine rotor according to a third embodiment of the present invention.
FIG. 8 is a cross-sectional view showing an example of a rotary electric machine rotor according to the related art.
FIG. 9 is an explanatory diagram showing a configuration inside a slot in an example of a rotary electric machine rotor according to the related art.
FIG. 10 is an exploded perspective view showing a configuration inside a slot in an example of a rotating electric machine rotor according to the related art.
FIG. 11 is a cross-sectional view for explaining a flow state of a cooling medium in a rotating electric machine rotor.
FIG. 12 is a characteristic diagram illustrating an example of an axial distribution of a cooling air amount in a rotor of the rotating electric machine rotor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotor core 2 Rotating shaft 3 Rotor winding 4 Retaining ring 5 Fan 6 Subslot 7 Slot 8 Wedge 9 Cripage block 10 Bottom insulating material 11 Subslot cover 12 Interlayer insulating material 13 Slot armor 14 Wedge ventilation hole 15 Cripage block ventilation hole 16 Rotor winding ventilation hole 17 Interlayer insulation ventilation hole 18 Underlay insulation ventilation hole 19 Subslot cover ventilation hole

Claims (1)

A slot in the rotor core includes at least wedges, crease blocks, conductor strips for rotor windings, interlayer insulation, bottom insulation, sub-slot covers, and slot armor. By forming a plurality of ventilation holes arranged in the axial direction, in the rotor of the rotating electrical machine in which a plurality of radial ducts for cooling medium flow are formed,
The rotor core is divided into at least one section in the rotor axis direction and two sections at the other end and one section at the center,
The pitch in the rotor axis direction of the ventilation holes formed in the bottom insulation material and the sub-slot cover in each member,
In the two sections at the one end and the other end, the pitch in the rotor axial direction of the ventilation holes formed in the members other than the bottom insulating material and the sub-slot cover in each member is described. Enlarged,
In one section at the center, the pitch in the rotor axis direction of ventilation holes formed in members other than the bottom insulation material and the sub-slot cover in each member is set to be the same. A rotating electric machine rotor characterized by the above-mentioned.

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