JP2022057359A - Rotary electric machine - Google Patents

Abstract

To provide a rotary electric machine having a new configuration that is easy to install at an installation location.SOLUTION: A rotary electric machine 1 includes a first housing 11, a stator, a rotor, a bearing 16, an oil tank 17, and a cooling unit 50. The rotor has a rotor core accommodated in the first housing 11 and a shaft 14 to which the rotor core is fixed. The bearing 16 rotatably supports the shaft 14 with respect to the first housing 11. The oil tank 17 stores lubricating oil that lubricates the bearing 16. The cooling unit 50 has a second housing 51, a cooling part, a pump, and a motor, and is mounted on the first housing 11. The cooling part is accommodated in the second housing 51 and cools the lubricating oil. The pump is accommodated in the second housing 51 and circulates the lubricating oil between the oil tank 17 and the cooling part. The motor drives the pump.SELECTED DRAWING: Figure 1

Description

The present invention relates to a rotary electric machine.

Conventionally, a rotary electric machine having a cooling unit for cooling a bearing by cooling the lubricating oil of the bearing supporting the shaft of the rotor is known.

Japanese Unexamined Patent Publication No. 2019-201516

In this type of rotary electric machine, for example, it is beneficial to obtain a new configuration in which the rotary electric machine can be easily installed at the installation location of the rotary electric machine.

Therefore, one of the problems of the present invention is to obtain a rotary electric machine having a new configuration that can be easily installed at the installation location.

In the rotary electric machine of the embodiment of the present invention, the first housing, the stator housed in the first housing, the rotor core housed in the first housing, and the rotor core are fixed. A rotor having a shaft, a bearing that rotatably supports the shaft with respect to the first housing, an oil tank for storing lubricating oil for lubricating the bearing, a second housing, and the above. A cooling unit housed in a second housing for cooling the lubricating oil, a pump housed in the second housing for circulating the lubricating oil between the oil tank and the cooling unit, and a pump for driving the pump. It has a drive source, and includes a cooling unit attached to the first housing.

According to the rotary electric machine of the present invention, it is possible to obtain a rotary electric machine having a novel configuration that is easy to install at an installation location.

FIG. 1 is an exemplary side view of a fully enclosed fan-shaped rotary electric machine according to an embodiment. FIG. 2 is an exemplary front view of the fully enclosed fan-shaped rotary electric machine of the embodiment. FIG. 3 is an exemplary cross-sectional view of a rotary electric machine main body in the fully enclosed fan-shaped rotary electric machine of the embodiment. FIG. 4 is an exemplary configuration diagram of a bearing cooling device in a fully enclosed fan-shaped rotary electric machine according to an embodiment.

Hereinafter, exemplary embodiments of the present invention will be disclosed. The configurations (technical features) of the embodiments shown below, as well as the actions and results (effects) brought about by the configurations, are examples.

<Structure of fully enclosed fan-shaped rotary electric machine 1>
FIG. 1 is an exemplary side view of the fully enclosed fan-shaped rotary electric machine 1 of the embodiment. FIG. 2 is an exemplary front view of the fully enclosed fan-shaped rotary electric machine 1 of the embodiment.

As shown in FIGS. 1 and 2, the fully enclosed fan-shaped rotary electric machine 1 includes a rotary electric machine main body 2 that performs a rotational operation, a cooling device 3, a bearing cooling device 4, and a control device 5. Inside the fully enclosed fan-shaped rotary electric machine 1, a closed space filled with a cooling gas such as air is provided over the rotary electric machine main body 2 and the cooling device 3. The cooling gas in the closed space heated by the heat generated by the rotary electric machine main body 2 exchanges heat with the outside air in the cooling device 3, so that the rotary electric machine main body 2 is cooled. The bearing cooling device 4 cools the bearing 16 by cooling the lubricating oil of the bearing 16 of the rotary electric machine main body 2. The control device 5 controls the rotational operation of the fully enclosed fan-shaped rotary electric machine 1 and controls the cooling unit 50. The fully enclosed fan-shaped rotary electric machine 1 is an example of a rotary electric machine.

<Rotating electric machine body 2>
FIG. 3 is an exemplary cross-sectional view of the rotary electric machine main body 2 in the fully enclosed fan-shaped rotary electric machine 1 of the embodiment. As shown in FIGS. 1 to 3, the rotary electric machine main body 2 has a housing 11, a rotor 12, a stator 13, a bearing 16, and an oil tank 17. In addition, in FIG. 3, the illustration of the oil tank 17 is omitted.

In the following description, for convenience, three directions orthogonal to each other are defined. The X direction is along the longitudinal direction of the housing 11 and the axial direction of the rotation center axis Ax of the rotor 12. The Y direction is along the lateral direction of the housing 11 and the direction orthogonal to the axial direction of the rotation center axis Ax. The Z direction is along the vertical direction of the housing 11. The X, Y, and Z directions are orthogonal to each other. The Y direction is an example of a direction orthogonal to the rotation center axis Ax. Here, the rotation center axis Ax is the center axis (center line) of the shaft 14 of the rotor 12. That is, the axial direction, the radial direction, and the circumferential direction of the rotation center axis Ax are the same as the axial direction, the radial direction, and the circumferential direction of the shaft 14. In the following description, unless otherwise specified, the axial direction, the radial direction, and the circumferential direction are the axial direction, the radial direction, and the circumferential direction of the rotation center axis Ax, that is, the axial direction, the radial direction, and the circumferential direction of the shaft 14. The direction.

The housing 11 is formed in a box shape. The housing 11 houses a part of the rotor 12 and the stator 13. The housing 11 is an example of the first housing.

The housing 11 has a plurality of walls such as a bottom wall 11a, a top wall 11b, two end walls 11c and 11d, and two side walls 11e and 11f.

Both the bottom wall 11a and the top wall 11b extend in a direction orthogonal to the Z direction (XY plane), and are provided in parallel with each other at intervals in the Z direction. The bottom wall 11a constitutes the lower end portion of the housing 11, and the top wall 11b constitutes the upper end portion of the housing 11.

Both the end wall 11c and the end wall 11d extend in the axial direction, that is, in the direction orthogonal to the X direction (YZ plane), and are provided in parallel with each other at intervals in the X direction. The end wall 11c extends between the ends of the bottom wall 11a and the top wall 11b in opposite directions in the X direction, and the end wall 11d extends between the ends of the bottom wall 11a and the top wall 11b in the X direction. .. The end walls 11c and 11d are examples of the first wall.

Both the side wall 11e and the side wall 11f extend in a direction orthogonal to the axial direction, that is, a direction orthogonal to the Y direction (XZ plane), and are provided in parallel with each other at intervals in the Y direction. .. The side wall 11e extends between the Y-direction ends of the bottom wall 11a and the top wall 11b, and the side wall 11f extends between the Y-direction opposite ends of the bottom wall 11a and the top wall 11b. The side walls 11e and 11f are examples of the second wall.

A cooling device 3 is attached to the top wall 11b. Further, a cooling unit 50 of the bearing cooling device 4 is attached to the side wall 11e. Further, a control device 5 is attached to the side wall 11f. That is, the cooling unit 50 and the control device 5 are arranged on opposite sides of the housing 11. In other words, the housing 11 is arranged between the cooling unit 50 and the control device 5. The cooling device 3, the cooling unit 50, and the control device 5 are each arranged outside the housing 11.

The rotor 12 has a shaft 14 and a rotor core 15. The rotor core 15 is fixed to the portion of the shaft 14 between both ends in the axial direction.

The shaft 14 is supported by the housing 11 via two bearings 16 so as to be rotatable around the rotation center axis Ax. In other words, the two bearings 16 rotatably support the shaft 14 with respect to the housing 11. The two bearings 16 are located on both sides of the rotor core 15 in the axial direction. That is, the rotor core 15 is located between the two bearings 16 in the axial direction.

Both ends 14a and 14b of the shaft 14 in the axial direction project from the housing 11 to the outside of the housing 11. One end 14a is coupled to a coupling target (not shown). An external fan (not shown) is fixed to the other end 14b. The outer fan rotates integrally with the shaft 14. Further, an inner fan 18 is fixed between each of the two bearings 16 and the rotor core 15 on the shaft 14. The inner fan 18 rotates integrally with the shaft 14.

The two bearings 16 are provided on the two end walls 11c and 11d. The bearing 16 is, for example, a slide bearing, a rolling bearing, or the like. The bearing 16 is lubricated with lubricating oil.

The oil tank 17 shown in FIGS. 1 and 2 stores the lubricating oil of the bearing 16. The oil tank 17 is provided for each bearing 16. That is, two oil tanks 17 are provided. The two oil tanks 17 are provided on the two end walls 11c and 11d. The oil tank 17 is arranged on the lower side of the bearing 16, that is, on the side opposite to the Z direction. The oil tank 17 is also referred to as a storage tank.

As shown in FIG. 3, the stator 13 has a stator core 19 and a stator winding 20. The stator core 19 is fixed to the housing 11. That is, the stator 13 is fixed to the housing 11. The stator core 19 is located outside the rotor core 15 in the radial direction, and is formed in a cylindrical shape surrounding the rotor core 15. The stator winding 20 penetrates through a plurality of slots (not shown) formed in the inner peripheral portion 19a of the stator core 19 so as to extend in the axial direction, and is fixed to the stator core 19.

<Cooling device 3>
As shown in FIGS. 1 and 2, the cooling device 3 is overlapped with the top wall 11b of the housing 11 and fixed to the top wall 11b. The cooling device 3 cools the rotor 12 and the stator 13 by exchanging heat between the air inside the housing 11 and the outside air which is the air outside the housing 11. The air in the housing 11 is circulated between the housing 11 and the cooling device 3 by the inner fan 18, and the outside air is introduced into the cooling device 3 by the outer fan.

<Bearing cooling device 4>
As shown in FIGS. 1 and 2, the bearing cooling device 4 includes a cooling unit 50 and two piping portions 55. The cooling unit 50 is connected to two bearings 16 and two oil tanks 17 by two piping portions 55. The lubricating oil that has flowed out of the oil tank 17 flows into the cooling unit 50 via the two piping portions 55, and the lubricating oil that has flowed out of the cooling unit 50 flows into the oil tank 17 after being supplied to the bearing 16.

FIG. 4 is an exemplary configuration diagram of the bearing cooling device 4 in the fully enclosed fan-shaped rotary electric machine 1 of the embodiment. As shown in FIG. 4, the cooling unit 50 includes a housing 51, a cooling unit 53, a pump 52, a motor 60, and an AC / DC converter 54.

The housing 51 is formed in a box shape. The housing 11 houses a cooling unit 53, a pump 52, a motor 60, and an AC / DC converter 54. The housing 51 is detachably fixed to the side wall 11e of the housing 11 of the rotary electric machine main body 2 by a coupling tool such as a bolt. The housing 51 is provided with a vent for ventilating the air inside the housing 51. The housing 51 is an example of the second housing.

The cooling unit 53 cools the lubricating oil. The cooling unit 53 has a heat exchanger through which the lubricating oil passes and a fan. Lubricating oil flows in the heat exchanger. The fan blows air so that it flows along the surface of the heat exchanger. The lubricating oil in the heat exchanger is heat-exchanged with the air (outside air) outside the heat exchanger and cooled. Power is supplied to the fan of the cooling unit 53 from the AC / DC converter 54.

The pump 52 is driven by the motor 60 to circulate the lubricating oil between the oil tank 17 and the cooling unit 53. Power is supplied to the motor 60 from the AC / DC converter 54. The motor 60 is an example of a drive source.

In this embodiment, only one pump 52, one motor 60, and one cooling unit 53 are provided. The pump 52 circulates lubricating oil between the two oil tanks 17 and the cooling unit 53.

The piping portion 55 has a plurality of pipes 55a to 55e. The end portion 55f on the inlet side of the piping portion 55 is connected to the oil tank 17, and the end portion 55g on the outlet side of the piping portion 55 is connected to the bearing 16. The pipes 55a and 55b extend between the oil tank 17 and the pump 52. The tube 55a includes an end 55f. The pipe 55c extends between the pump 52 and the cooling unit 53. The pipes 55d and 55e extend between the cooling unit 53 and the bearing 16. The tube 55e includes an end 55 g.

Further, a connecting portion 56 is provided between the pipes 55a and 55b and between the pipes 55d and 55e, respectively. The connecting portion 56 between the pipes 55a and 55b connects the pipes 55a and the pipes 55b to each other in a detachable manner. The connecting portion 56 between the pipe 55d and the pipe 55e connects the pipe 55d and the pipe 55e to each other in a detachable manner. Each connecting portion 56 includes a flange 57 provided on one of the pipes 55a and 55d, a flange 57 provided on the other pipes 55b and 55e, and a coupling tool 58 such as a bolt for connecting the two flanges 57. Have. By removing the binder 58, the two flanges 57 can be separated. Here, of the piping portions 55, the pipes 55b to 55d are included in the cooling unit 50. Therefore, the cooling unit 50 can be attached to and detached from the pipes 55a and 55e, and thus the bearing 16 and the oil tank 17.

In the bearing cooling device 4 having the above configuration, when the pump 52 is rotated by the drive of the motor 60, the lubricating oil circulates between the oil tank 17 and the cooling unit 53. Specifically, the lubricating oil flowing out of the lubricating oil in the two oil tanks 17 flows into the cooling unit 53 through the pipes 55a and 55b, the pump 52, and the pipe 55c. The lubricating oil that has flowed into the cooling unit 53 is cooled by the cooling unit 53 as it flows through the cooling unit 53, and then flows out of the cooling unit 53. The lubricating oil flowing out of the cooling unit 53 is supplied to the bearing 16 through the pipes 55d and 55e. As a result, the bearing 16 is lubricated and cooled. The lubricating oil supplied to the bearing 16 falls into the oil tank 17. That is, the lubricating oil returns to the oil tank 17.

<Effect of embodiment>
As described above, in the present embodiment, the fully enclosed external fan-shaped rotary electric machine 1 (rotary electric machine) includes the housing 11 (first housing), the stator 13, the rotor 12, the bearing 16, and the oil tank 17. , A cooling unit 50. The stator 13 is housed in the housing 11. The rotor 12 has a rotor core 15 housed in a housing 11 and a shaft 14 to which the rotor core 15 is fixed. The bearing 16 rotatably supports the shaft 14 with respect to the housing 11. The oil tank 17 stores the lubricating oil that lubricates the bearing 16. The cooling unit 50 has a housing 51, a cooling unit 53, a pump 52, and a motor 60 (drive source), and is attached to the housing 11. The cooling unit 53 is housed in the housing 51 and cools the lubricating oil. The pump 52 is housed in a housing 51 and circulates lubricating oil between the oil tank 17 and the cooling unit 53. The motor 60 drives the pump 52.

According to such a configuration, since the cooling unit 50 having the cooling unit 53, the pump 52, and the motor 60 is attached to the housing 11, for example, the cooling unit 53 as a configuration for cooling the lubricating oil. , The pump 52, and the motor 60 are easier to install the fully enclosed external fan-shaped rotary electric machine 1 at the installation location of the fully enclosed external fan-shaped rotary electric machine 1, as compared with the configuration in which the pump 52 and the motor 60 are not installed in the housing 11. In a configuration in which the cooling unit 53, the pump 52, and the motor 60 are not installed in the housing 11, for example, the cooling unit 53, the pump 52, and the motor 60 must be connected to the bearing 16 and the oil tank 17 at the installation site. Therefore, it takes time and effort to install the fully enclosed fan-shaped rotary electric machine 1. The installation location of the fully enclosed fan-shaped rotary electric machine 1 is, for example, various plants and factories. Further, according to the above configuration, since the lubricating oil is circulated by the cooling unit 50 to supply the lubricating oil to the bearing 16 and to cool the bearing 16, for example, the bearing 16 does not have to be a forced lubrication type or a water-cooled type. It's okay. Therefore, the cost of the fully enclosed fan-shaped rotary electric machine 1 can be reduced. Here, the forced lubrication type bearing is used, for example, in the high-speed type and the high ambient temperature specification in the horizontal type fully enclosed fan type rotary electric machine 1, and the water-cooled type bearing is, for example, the vertical type (vertical type) all. Used in a closed fan-shaped rotary electric machine (not shown).

Further, in the present embodiment, two bearings 16 and two oil tanks 17 are provided. The rotor core 15 is located between the two bearings 16 in the axial direction of the shaft 14. Only one pump 52, one motor 60, and one cooling unit 53 are provided. The pump 52 circulates lubricating oil between the two oil tanks 17 and the cooling unit 53.

According to such a configuration, two bearings 16 can be lubricated and cooled by one pump 52, a motor 60, and a cooling unit 53, respectively. Therefore, the configuration of the fully enclosed fan-shaped rotary electric machine 1 can be simplified as compared with the configuration in which the pump 52, the motor 60, and the cooling unit 53 are provided for each of the two bearings 16.

Further, in the present embodiment, the housing 11 is arranged with two end walls 11c and 11d (first wall) arranged at intervals in the axial direction and at intervals in the direction orthogonal to the axial direction. It has two side walls 11e and 11f (second wall). Bearings 16 are provided on each of the end walls 11c and 11d. The cooling unit 50 is arranged outside the housing 11 and is fixed to one of the two side walls 11e and 11f (for example, the side wall 11e).

According to such a configuration, since the cooling unit 50 is fixed to the side 11e to which the two bearings 16 and the oil tank 17 are not mounted, the mounting area of the cooling unit 50 can be easily secured and the mounting area of the cooling unit 50 can be easily secured. The cooling unit 50 can be easily attached and detached.

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 ... Fully enclosed external fan-shaped rotary electric machine (rotary electric machine), 11 ... Housing (first housing), 12 ... Rotor, 13 ... Stator, 14 ... Shaft, 15 ... Rotor core, 16 ... Bearing, 17 ... Oil tank , 50 ... Cooling unit, 51 ... Housing (second housing), 52 ... Pump, 53 ... Cooling unit, 60 ... Motor (drive source), 11c, 11d ... End wall (first wall), 11e, 11f ... Side wall (second wall).

Claims (3)

With the first housing
The stator housed in the first housing and
A rotor having a rotor core housed in the first housing and a shaft to which the rotor core is fixed.
A bearing that rotatably supports the shaft with respect to the first housing,
An oil tank that stores the lubricating oil that lubricates the bearing,
A pump housed in the second housing, a cooling unit housed in the second housing and cooling the lubricating oil, and a pump housed in the second housing and circulating the lubricating oil between the oil tank and the cooling unit. And a cooling unit having a drive source for driving the pump and attached to the first housing.
Rotating electric machine equipped with. Two bearings and two oil tanks are provided.
The rotor core is located between the two bearings in the axial direction of the shaft.
Only one pump, one drive source, and one cooling unit are provided.
The rotary electric machine according to claim 1, wherein the pump circulates the lubricating oil between the two oil tanks and the cooling unit. The first housing includes two first walls arranged at intervals in the axial direction and two second walls arranged at intervals in a direction orthogonal to the axial direction. Have and
The bearing is provided on each of the first walls.
The rotary electric machine according to claim 2, wherein the cooling unit is arranged outside the first housing and attached to one of the two second walls.

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