JP7030074B2 - Rotating machine and rotating machine system - Google Patents

Description

The present invention relates to a rotary electric machine and a rotary electric machine system.

A fully enclosed rotary electric machine usually has a cooler for cooling the cooling gas circulating in the machine with an external cooling medium. As the cooling medium, there are usually cases where outside air is used and cases where a cooling liquid such as cooling water is used.

When a liquid cooling medium is used, a method of circulating the cooling medium between the cooler of the rotary electric machine, the external pump, and the cooling source is common. That is, the cooler is a part of the external cooling system, and the driving and cooling of the cooling medium depend on the external system (see Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 61-224929 Japanese Unexamined Patent Publication No. 4-101647

The cooling method using a liquid cooling medium has the advantage of good cooling efficiency. However, as mentioned above, the cooler is part of the external cooling system and depends on the external system to drive and cool the cooling medium.

That is, for example, the characteristics of the pump for the cooling medium of the external cooling system connected to the cooler of the rotary electric machine are consistent with the characteristics of the rotary electric machine such as the pressure loss of the cooler and the required flow rate of the cooling medium. Must be. Further, the liquid quality of the cooling medium supplied to the cooler of the rotary electric machine must also meet the required level from the rotary electric machine side. Therefore, it is necessary to confirm or adjust the consistency between the rotary electric machine side and the external cooling system side at the planning stage. In addition, it is necessary to confirm and adjust each time the plan is changed. Therefore, it is desired to reduce the dependence on the external cooling system as much as possible.

Therefore, an object of the present invention is to reduce the dependence of the rotary electric machine on the external cooling system.

In order to achieve the above object, the rotary electric machine according to the present invention has a rotor having a rotor shaft extending in the axial direction and a rotor core attached to the rotor shaft, and a rotor outside the radial direction of the rotor core. A stator having an arranged stator core and a stator winding penetrating the stator core, two bearings that rotatably support the rotor shaft, and the rotor core and the stator are housed. The frame, the two bearing brackets attached to both ends of the frame in the axial direction to statically support the two bearings, and the rotor core and the stator core by driving the cooling gas. A cooler having an internal fan to pass through and a cooling tube to pass a cooling medium for cooling the cooling gas, and the cooler attached to the rotor shaft and rotating together with the rotor shaft to drive the cooling medium. The refrigerant pump is provided with a cooling pump for circulating outside air, and the refrigerant pump is provided with a ventilation hole for cooling through which outside air passes, and is attached to the rotor shaft and rotates together with the rotor shaft to pass the outside air to the ventilation. It is characterized by further having an external fan that drives toward the hole .

Further, the rotary electric machine system according to the present invention is characterized by including the above-mentioned rotary electric machine and a cooling source for cooling the cooling medium.

According to the present invention, the dependence of the rotary electric machine on the external cooling system can be reduced.

It is a vertical sectional view which shows the rotary electric machine which concerns on 1st Embodiment. It is a system diagram which shows the structure of the rotary electric machine system which concerns on 1st Embodiment. It is a vertical sectional view which shows the rotary electric machine which concerns on 2nd Embodiment. FIG. 3 is a front view taken along the line IV-IV of FIG. 3 showing a refrigerant pump of a rotary electric machine according to a second embodiment. It is a system diagram which shows the structure of the rotary electric machine which concerns on 2nd Embodiment.

Hereinafter, the rotary electric machine and the rotary electric machine system according to the embodiment of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a vertical sectional view showing a rotary electric machine according to the first embodiment.

The rotary electric machine 100 includes a rotor 10, a stator 20, a coupling side bearing 31 and an anti-coupling side bearing 32, a frame 40, a coupling side bearing bracket 45 and an anti-coupling side bearing bracket 46, a cooler 50, and a refrigerant pump 60. ..

The rotor 10 has a rotor shaft 11 extending in the axial direction and a rotor core 12 attached to the rotor shaft 11. The rotor shaft 11 extends in the axial direction, and a coupling portion 11a for coupling with a coupling target (not shown) is provided at one end thereof. The rotor shaft 11 is rotatably supported by a coupling side bearing 31 and an anti-coupling side bearing 32 at portions on both sides of the rotor core 12. An inner fan 15 is attached to a portion of the rotor shaft 11 between the rotor core 12 and the coupling side bearing 31 and a portion between the rotor core 12 and the anti-coupling side bearing 32, respectively.

The stator 20 has a cylindrical stator core 21 and a stator winding 22. The stator core 21 is arranged so as to surround the radial outside of the rotor core 12. The stator winding 22 is arranged and fixed in a plurality of slots (not shown) formed so as to penetrate in the axial direction at intervals in the circumferential direction on the radial inner surface of the stator core 21. It protrudes on both sides of the core 21 in the axial direction.

The frame 40 has a cylindrical shape and is arranged so as to surround the radial outside of the stator 20. A coupling-side bearing bracket 45 and an anti-coupling-side bearing bracket 46 are attached to the end of the frame 40, and statically support the coupling-side bearing 31 and the anti-coupling-side bearing 32, respectively.

The cooler 50 is provided above the frame 40. The cooler 50 has a cooling pipe 51 through which a liquid cooling medium such as cooling water passes, and a cooler cover 52 for accommodating the cooling pipe 51. The space inside the cooler cover 52 and the space inside the frame 40 communicate with each other through the cooler inlet opening 53 and the two cooler outlet openings 54. The cooler inlet opening 53 is formed above the stator 20, and the two cooler outlet openings 54 are formed on both sides in the axial direction with the cooler inlet opening 53 interposed therebetween.

As shown by the white arrows in FIG. 1, the cooling gas circulating in the frame 40 by the inner fans 15 on both sides enters the cooler 50 through the cooler inlet opening 53 and is cooled by the cooling medium in the cooling pipe 51. The cooling gas flows into the frame 40 from the cooler outlet openings 54 on both sides, and is sent to the rotor core 12 and the stator 20 side by the respective inner fans 15.

The refrigerant pump 60 is provided on the outer side in the axial direction of the anti-coupling side bearing bracket 46. The refrigerant pump 60 is, for example, a centrifugal pump, and has a plurality of pump blades 61 and a casing 62 for accommodating the pump blades 61.

The pump blade 61 is attached to the axially outer portion of the uncoupled side bearing 32 of the rotor shaft 11.

The casing 62 is supported by the anti-coupling side bearing bracket 46 via the support rod 67. Instead of the support rod 67, a plate-shaped support structure may be used. The radial outer portion of the pump blade 61 of the casing 62 is a wide space, and a pressure chamber 63 is formed. In the pressure chamber 63, most of the kinetic energy of the cooling medium flowing out of the pump blade 61 is converted into pressure.

An inlet opening 64, which is an inlet of the cooling medium, is formed in the central portion of the casing 62, which is the opposite side in the axial direction (left side in FIG. 1) to the side of the casing 62 facing the bearing bracket 46 on the uncoupled side. Has been done. Further, an outlet opening 65, which is an outlet of the cooling medium, is formed at the radial outer end of the casing 62.

FIG. 2 is a system diagram showing the configuration of the rotary electric machine system according to the first embodiment, and shows the flow path of the cooling medium.

The rotary electric machine system 200 includes a rotary electric machine 100 and an external cooling system 80. The external cooling system 80 has a cooling source 81 and external piping 90. The external pipe 90 has a cooler outlet pipe 91 and a cooling source outlet pipe 92.

First, in the rotary electric machine 100, the outlet opening 65 (FIG. 1) of the refrigerant pump 60 is connected to one end of the pump outlet pipe 66. The other end of the pump outlet pipe 66 is connected to the cooling pipe 51 (FIG. 1) of the cooler 50.

The cooling source 81 of the external cooling system 80 is installed outside the rotary electric machine 100. The cooling medium is the cooler 50 of the rotary electric machine 100, which cools the cooling gas for cooling the inside of the machine, and conversely raises the temperature itself to cool the cooling medium such as water. The cooling source 81 cools the cooling medium. As shown in FIG. 2, the cooling medium may be cooled by the cooling source 81 by a non-contact type in which heat exchange is performed without mixing the cooling medium and the fluid of the cooling source for cooling the cooling medium, but the cooling tower may be used. As described above, heat exchange may be performed by contact-type heat exchange in which heat is exchanged when the cooling medium comes into direct contact with the outside air.

The cooling pipe 51 of the cooler 50 of the rotary electric machine 100 and the cooling source 81 are connected by a cooler outlet pipe 91 of the external pipe 90. Further, the cooling source 81 and the refrigerant pump 60 are connected by a cooling source outlet pipe 92 of the external pipe 90.

In the rotary electric machine system 200 according to the first embodiment as described above, the cooling medium for cooling the cooling gas for cooling the inside of the machine is connected by the external pipe 90 by the refrigerant pump 60 of the rotary electric machine 100 itself. It circulates between the cooler 50 of the rotary electric machine 100 and the external cooling system 80 of the rotary electric machine 100.

That is, the rotary electric machine 100 itself has a refrigerant pump 60 that is responsible for the circulation of the cooling medium.

In this way, the dependence of the rotary electric machine on the external cooling system can be reduced.

[Second Embodiment]
FIG. 3 is a vertical sectional view showing a rotary electric machine according to the second embodiment. Further, FIG. 4 is a front view taken along the line IV-IV of FIG. 3 showing a refrigerant pump.

The second embodiment is a modification of the first embodiment. The rotary electric machine 100a in the second embodiment further includes an outer fan 70. Further, a ventilation hole 68 is formed in the refrigerant pump 60a. In other respects, it is the same as the first embodiment.

The outer fan 70 is, for example, an axial fan, and is provided between the refrigerant pump 60a and the anti-coupling side bearing bracket 46. The outer fan 70 has a plurality of blades 71 attached to the rotor shaft 11 and a cylindrical outer fan cover 72 provided so as to surround the blades 71 on the radial outer side of the blades 71. One end of the outer fan cover 72 is coupled to the anti-coupling side bearing bracket 46 via a plurality of support rods 67 and is supported by the anti-coupling side bearing bracket 46.

The plurality of ventilation holes 68 of the refrigerant pump 60a are formed so as to penetrate the pressure chamber 63 in the axial direction at intervals in the circumferential direction.

In the rotary electric machine 100a having the above configuration, when the rotor shaft 11 rotates, the plurality of blades 71 rotate to generate a driving force. As a result, the outside air is sucked into the plurality of blades 71 from between the support rods 67. The outside air discharged in the axial direction from the plurality of blades 71 flows into the ventilation holes 68 of the refrigerant pump 60a and passes through the ventilation holes 68. As a result, the cooling medium in the pressure chamber 63 of the casing 62 of the refrigerant pump 60a is cooled.

Here, in the refrigerant pump 60a, it is the pressure chamber 63 in the casing 62 that the ventilation hole 68 through which the cooling medium is cooled penetrates. As a result, an obstacle in the flow path due to the through portion of the ventilation hole 68 exists in the pressure chamber 63, but the ventilation hole 68 is formed because the flow velocity of the cooling medium is low in the pressure chamber 63. The increase in the pressure loss of the cooling medium due to the above does not increase.

FIG. 5 is a system diagram showing the configuration of the rotary electric machine according to the second embodiment.

The outlet side of the cooler 50 is connected to the inlet opening 64 (FIG. 3) of the refrigerant pump 60a by the pump inlet pipe 69. Further, the outlet opening 65 (FIG. 3) of the refrigerant pump 60a is connected to the cooler 50 by the pump outlet pipe 66 as in the first embodiment.

In the rotary electric machine system 200a according to the present embodiment, there is no external cooling system, and the rotary electric machine 100a itself. That is, the rotary electric machine 100a itself includes a combination of a refrigerant pump 60a having a function of driving a cooling medium, an external fan 70 having a function of cooling the cooling medium, and a ventilation hole 68 of the refrigerant pump 60. Therefore, no external cooling system is required.

As described above, according to the second embodiment, it is possible to provide a rotary electric machine that does not depend on an external cooling system.

[Other embodiments]
Although the embodiments of the present invention have been described above, the embodiments are presented as examples and are not intended to limit the scope of the invention.

Furthermore, these 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 variations thereof are included in the scope of the invention described in the claims and the equivalent scope thereof, as are included in the scope and gist of the invention.

10 ... rotor, 11 ... rotor shaft, 11a ... coupling part, 12 ... rotor core, 15 ... inner fan, 20 ... stator, 21 ... stator core, 22 ... stator winding, 31 ... coupling side bearing , 32 ... anti-coupling side bearing, 40 ... frame, 45 ... coupling side bearing bracket, 46 ... anti-coupling side bearing bracket, 50 ... cooler, 51 ... cooling pipe, 52 ... cooler cover, 53 ... cooler inlet opening, 54 ... cooler outlet opening, 60, 60a ... refrigerant pump, 61 ... pump bearing, 62 ... casing, 63 ... pressure chamber, 64 ... inlet opening, 65 ... outlet opening, 66 ... pump outlet pipe, 67 ... support rod, 68. ... Ventilation hole, 69 ... Pump inlet pipe, 70 ... External fan, 71 ... Wings, 72 ... External fan cover, 80 ... External cooling system, 81 ... Cooling source, 90 ... External piping, 91 ... Cooler outlet pipe, 92 ... Cooling source outlet pipe, 100, 100a ... rotary electric machine, 200 ... rotary electric machine system

Claims (4)

A rotor having a rotor shaft extending in the axial direction and a rotor core attached to the rotor shaft, and a rotor.
A stator having a stator core arranged radially outside the rotor core and a stator winding penetrating the inside of the stator core,
Two bearings that rotatably support the rotor shaft,
A frame for accommodating the rotor core and the stator, and
Two bearing brackets attached to both ends of the frame in the axial direction to statically support the two bearings, respectively.
An inner fan that drives the cooling gas to pass through the rotor core and the stator core,
A cooler having a cooling pipe through which a cooling medium for cooling the cooling gas is passed,
A refrigerant pump that is attached to the rotor shaft and rotates together with the rotor shaft to drive the cooling medium and circulate it in the cooler.
Equipped with
The refrigerant pump is formed with a ventilation hole for cooling through which outside air passes.
It further has an external fan that is attached to the rotor shaft and rotates with the rotor shaft to drive outside air toward the ventilation holes.
A rotating electric machine characterized by that . The refrigerant pump
With multiple pump wings,
A casing that houses the plurality of pump blades and has a pressure chamber formed on the radial outer side of the plurality of pump blades.
The rotary electric machine according to claim 1, wherein the rotary electric machine is characterized by having. The rotary electric machine according to claim 2 , wherein the ventilation hole is formed so as to penetrate the pressure chamber. The rotary electric machine according to any one of claims 1 to 3 ,
A cooling source that cools the cooling medium,
A rotary electric system characterized by being equipped with.

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