WO2021187062A1

WO2021187062A1 - Rotary machine

Info

Publication number: WO2021187062A1
Application number: PCT/JP2021/007563
Authority: WO
Inventors: 拓植松; 大真増子
Original assignee: 株式会社明電舎
Priority date: 2020-03-19
Filing date: 2021-02-26
Publication date: 2021-09-23
Also published as: JP2021151086A; JP6911960B1

Abstract

The present invention relates to a rotary machine. The objective of the present invention is to provide a rotary machine which can easily be handled without an increase in the size of the device, and with which cooling oil can be provided to a coil end. A motor (10) is equipped with a stator (11) having a stator core (11a) and a coil (11b) wound around the stator core (11a), a rotor (12) arranged opposing the stator (11) with an air gap therebetween, and a frame (13) covering the stator (11) from the outside in the radial direction. The coil (11b) has a first coil end (11c) protruding toward one side in the axial direction of the stator core (11a). The frame (13) is provided with a first flow passage (17) penetrating from an inflow opening (16) on the outside in the radial direction to a first opening (17a) on one side in the axial direction, and also with a first head member (18) which has a second flow passage (18e) connected to the first opening (17a) and penetrating toward the first coil end (11c).

Description

Rotating machine

The present invention relates to a rotating machine.

It is desirable to cool the rotating machine because it may generate heat when driven and reduce efficiency. For example, in order to cool the coil end of the stator, cooling oil is flowed through the coil end.

Patent Document 1 discloses a configuration in which cooling oil flows through a cooling pipe installed on the upper side of the stator. A diversion pipe is connected to the cooling pipe so that cooling oil is applied to the coil end from the tip of the diversion pipe.

Japanese Unexamined Patent Publication No. 2019-80416

In Patent Document 1, a cooling pipe having a length equivalent to the axial length of the stator is required, and a space for arranging the cooling pipe is required above the stator. Further, in Patent Document 1, a diversion pipe is provided at the tip of the cooling pipe, but there is also a problem that the configuration related to cooling of the stator becomes large due to the length of the diversion pipe. In addition, the diversion pipe is difficult to handle at the time of assembly, and there is a risk of damage. Further, Patent Document 1 discloses four diversion pipes, but if more diversion pipes are provided in order to distribute cooling oil to various parts of the coil end, the size and damage of the diversion pipes are further increased. There was a problem that it was inconvenient to handle because of the increased risk.

An object of the present invention is to provide a rotating machine that is easy to handle without increasing the size of the device and can distribute cooling oil to the coil end.

The rotating machine according to one aspect of the present invention includes a stator having a stator core and a coil wound around the stator core, a rotor arranged so as to face the stator with an air gap, and the stator radially outside. The coil comprises a first coil end projecting axially one side of the stator core, the frame comprising a first axially unilateral inflow port on the radial outer side. Further comprising a first head member having a first flow path penetrating the opening and having a second flow path connected to the first opening and penetrating towards the first coil end.

In the rotary machine of the above aspect, the coil has a second coil end projecting to the other side in the axial direction of the stator core, and the first flow path is the other side in the axial direction from the first opening. A second head member may further be provided with a third flow path that penetrates into the second opening, connects to the second opening, and penetrates towards the second coil end.

In the rotary machine of the above aspect, the first head member is fixed to the frame on the upper side in the vertical direction of the first coil end, and the second head member is vertical to the second coil end. It may be fixed to the frame on the upper side in the direction.

In the rotary machine of the above aspect, the second flow path is connected to the fourth flow path extending in one axial direction from the first opening and the fourth flow path, and the first head It has a fifth flow path extending in a direction parallel to a straight line connecting the member and the first coil end, and the third flow path extends from the second opening to the other side in the axial direction. Even if it has a sixth flow path and a seventh flow path that is connected to the sixth flow path and extends in a direction parallel to a straight line connecting the second head member and the second coil end. good.

In the rotary machine of the above aspect, the first flow path, the second flow path, and the third flow path are flow paths through which the cooling medium flowing in from the inflow port flows, and are the flow paths of the cooling medium. The cross-sectional area of the flow is such that the fifth flow path is smaller than the first flow path, the seventh flow path is smaller than the first flow path, and the first head member is the first. The second head member may have a plurality of the fifth flow paths, and the second head member may have a plurality of the seventh flow paths.

In the rotary machine of the above aspect, a shaft arranged at the center of rotation of the rotor, a first bearing that pivotally supports the shaft on one side in the axial direction, and a third bearing that pivotally supports the shaft on the other side in the axial direction. The first head member further comprises two bearings, the first head member having an eighth flow path for ejecting a cooling medium toward the first bearing, and the second head member having a cooling medium. It may have a ninth flow path that ejects toward the second bearing.

According to one aspect of the present invention, it is possible to provide a rotating machine that is easy to handle without increasing the size of the device and can distribute cooling oil to the coil end.

It is a perspective view of the rotary machine which concerns on 1st Embodiment of this invention. FIG. 5 is a side sectional view showing the motor 10 of FIG. 1 cut along a plane orthogonal to the Z axis and passing through the central axis J. It is a perspective view which shows by removing the bracket 14 from the motor 10 of FIG. It is a perspective view which shows by removing the bracket 15 from the motor 10 of FIG. It is a perspective view which shows the head member 18 of FIG. It is a perspective view which shows the head member 19 of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiment, in order to make the description easy to understand, the structures and elements other than the main part of the present invention will be described in a simplified or omitted manner. Further, in the drawings, the same elements are designated by the same reference numerals. It should be noted that the shapes, dimensions, etc. of each element shown in the drawings are schematically shown, and do not indicate the actual shapes, dimensions, etc.

In the following description, the direction in which the central axis J shown in FIG. 2 extends is simply referred to as "axial direction", the radial direction centered on the central axis J is simply referred to as "diameter direction", and the central axis J is centered. The circumferential direction is simply called the "circumferential direction". Further, in the axial direction, the right side in FIG. 2 is referred to as one side, and the left side in FIG. 2 is referred to as the other side. Further, in the radial direction, the side closer to the central axis J is called the inner side, and the side far from the central axis J is called the outer side.

Further, in the drawing, the XYZ coordinate system is shown as a three-dimensional Cartesian coordinate system as appropriate. In the XYZ coordinate system, the X-axis direction is a direction parallel to the central axis J and is a left-right direction in the side cross-sectional view shown in FIG. The Y-axis direction is a direction orthogonal to the X-axis direction, and is the vertical direction of the side sectional view shown in FIG. The Z-axis direction is a direction orthogonal to the X-axis direction and the Y-axis direction. In any of the X-axis direction, the Y-axis direction, and the Z-axis direction, the side facing the arrow shown in the figure is the + side, and the opposite side is the-side.

Further, in the following description, "extending or expanding in the axial direction" means, in addition to the case of strictly extending or expanding in the axial direction (X-axis direction), a direction tilted within a range of less than 45 ° with respect to the axial direction. Including the case of extending or expanding to. Further, in the following description, extending or expanding in the radial direction means that the term extends or expands in the radial direction, that is, in the direction perpendicular to the axial direction (X-axis direction), and also in the radial direction. Including the case where it extends or spreads in a tilted direction within a range of less than 45 °.

<First Embodiment>
FIG. 1 is a perspective view of a motor according to the first embodiment of the present invention. FIG. 2 is a side sectional view showing the motor 10 of FIG. 1 cut along a plane orthogonal to the Z axis and passing through the central axis J. In this embodiment, a motor which is an example of a rotating machine will be described. The motor 10 is an example of a rotating machine.

The motor 10 includes a stator 11, a rotor 12, a frame 13, a bracket 14, and a bracket 15. The motor 10 has an oil pan 30 on the lower side of the frame 13 in the vertical direction. The stator 11 includes a stator core 11a and a coil 11b wound around the stator core 11a. The coil 11b has a coil end 11c projecting to one side in the axial direction of the stator core 11a and a coil end 11d projecting to the other side in the axial direction of the stator core 11a. The rotor 12 is arranged so as to face the stator 11 via an air gap. The rotor 12 is arranged inside the stator 11 in the radial direction. The rotor 12 has a shaft 22 arranged along the central axis J. The rotor 12 rotates around the shaft 22 as a rotation axis.

The frame 13 covers the stator 11 from the outside in the radial direction. The frame 13 is, for example, die-cast aluminum. The bracket 14 covers one side of the frame 13 in the axial direction. The bracket 14 covers the frame 13 so as to close the opening on one side in the axial direction. The bracket 15 covers the other side of the frame 13 in the axial direction. The bracket 15 covers the frame 13 so as to close the opening on the other side in the axial direction. The shaft 22 penetrates the bracket 15.

The motor 10 includes a bearing 41 that pivotally supports the shaft 22 on one side in the axial direction, and a bearing 51 that pivotally supports the shaft 22 on the other side in the axial direction. The bracket 14 fixes the bearing 41. The bracket 15 fixes the bearing 51. The bearing 41 and the bearing 51 pivotally support the shaft 22 so that the rotor 12 can rotate with the central axis J as the rotation axis.

The frame 13 has an inflow port 16 on the outer side in the radial direction. The inflow port 16 is an inflow port for cooling oil. Cooling oil is an example of a cooling medium. Other known cooling media may be used instead of the cooling oil. The motor 10 causes the cooling oil to flow into the frame 13 from the inflow port 16 by, for example, a pump. The frame 13 has a flow path 17 that penetrates from the inflow port 16 to the opening 17a on one side in the axial direction. The opening 17a is an opening connected to the flow path 17. The motor 10 includes a head member 18 connected to the opening 17a. The head member 18 serves as a shower head. The frame 13 has a flow path 17 that penetrates from the inflow port 16 to the opening 17b on the other side in the axial direction. The opening 17b is an opening connected to the flow path 17. The motor 10 includes a head member 19 connected to the opening 17b. The head member 19 serves as a shower head. The flow path 17 penetrates from the opening 17a to the opening 17b. The cooling oil flowing in from the inflow port 16 goes to both the opening 17a and the opening 17b.

FIG. 3 is a perspective view showing the motor 10 of FIG. 1 with the bracket 14 removed. By removing the bracket 14 from the motor 10, the coil end 11c on one side in the axial direction of the stator 11 can be seen. In FIG. 3, the coil end 11c is simplified for easy viewing. The head member 18 is fixed to the frame 13 on the upper side of the coil end 11c in the vertical direction.

FIG. 4 is a perspective view showing the motor 10 of FIG. 1 with the bracket 15 removed. By removing the bracket 15 from the motor 10, the coil end 11d on the other side in the axial direction of the stator 11 can be seen. In FIG. 4, the coil end 11d is simplified for easy viewing. The head member 19 is fixed to the frame 13 on the upper side of the coil end 11d in the vertical direction.

FIG. 5 is a perspective view showing the head member 18 of FIG. 5 (A) and 5 (B) show the head member 18 in different directions. The head member 18 has a plate portion 18a fixed to the frame 13 and a head portion 18b located on one side of the plate portion 18a in the axial direction. The plate portion 18a has a substantially quadrilateral flat plate shape. The plate portion 18a is fixed to the frame 13 in a direction in which the diagonal of the quadrilateral is orthogonal to the vertical direction and the vertical direction. The head portion 18b has a bottomed cylindrical shape. The head portion 18b may have a bottomed square cylinder shape or another shape. The plate portion 18a is fixed to the frame 13 by, for example, a bolt. The plate portion 18a has a through hole through which the head portion 18b penetrates. The plate portion 18a and the head portion 18b are integrated.

The head portion 18b has a cylindrical side wall 18f and a disk-shaped side wall 18g corresponding to the bottom of the side wall 18f. The side wall 18f and the side wall 18g are integrated. The head portion 18b has an opening 18c that opens on the other side in the axial direction. The opening 18c is an opening connected to the flow path 18h formed by the inner wall of the side wall 18f. The head portion 18b is fixed to the frame 13 by aligning the opening 18c with the opening 17a of the frame 13. The flow path 18h is a flow path extending from the opening 17a to one side in the axial direction.

The head portion 18b has a flow path 18e. The flow path 18e is connected to the flow path 18h and extends in a direction parallel to the straight line connecting the head member 18 and the coil end 11c. The cross-sectional area of the cooling oil flow is smaller in the flow path 18e than in the flow path 17. The cooling oil flowing in from the inflow port 16 is ejected from the flow path 18e toward the coil end 11c. The cooling oil that has passed through the coil end 11c is stored in the oil pan 30. The head member 18 has a plurality of flow paths 18e depending on the axial position and the circumferential position of the coil end 11c. The plurality of flow paths 18e cover the entire axial position and circumferential position of the coil end 11c, and the entire axial position and circumferential position of the coil end 11c can be cooled by the cooling oil.

The head portion 18b has a flow path 18d. The flow path 18d is connected to the flow path 18h and extends in one axial direction. The cross-sectional area of the cooling oil flow is smaller in the flow path 18d than in the flow path 17. The cooling oil flowing in from the inflow port 16 is ejected from the flow path 18d toward the bearing 41. The cooling oil that has passed through the bearing 41 is stored in the oil pan 30. The head member 18 has a plurality of flow paths 18d according to the circumferential position of the bearing 41. The plurality of flow paths 18d cover the entire circumferential position of the bearing 41, and the entire circumferential position of the bearing 41 can be cooled by the cooling oil.

FIG. 6 is a perspective view showing the head member 19 of FIG. 6 (A) and 6 (B) show the head member 19 in different directions. The head member 19 has a plate portion 19a fixed to the frame 13 and a head portion 19b located on the other side of the plate portion 19a in the axial direction. The plate portion 19a has a substantially quadrilateral flat plate shape. The plate portion 19a is fixed to the frame 13 in a direction in which the diagonal of the quadrilateral is neither orthogonal to nor parallel to the vertical direction. The head portion 19b has a bottomed cylindrical shape. The head portion 19b may have a bottomed square cylinder shape or another shape. The plate portion 19a is fixed to the frame 13 by, for example, a bolt. The plate portion 19a has a through hole through which the head portion 19b penetrates. The plate portion 19a and the head portion 19b are integrated.

The head portion 19b has a cylindrical side wall 19f and a disk-shaped side wall 19g corresponding to the bottom of the side wall 19f. The side wall 19f and the side wall 19g are integrated. The head portion 19b has an opening 19c that opens on one side in the axial direction. The opening 19c is an opening connected to the flow path 19h formed on the inner wall of the side wall 19f. The head portion 19b is fixed to the frame 13 by aligning the opening 19c with the opening 17b of the frame 13. The flow path 19h is a flow path extending from the opening 17b to the other side in the axial direction.

The head portion 19b has a flow path 19e. The flow path 19e is connected to the flow path 19h and extends in a direction parallel to the straight line connecting the head member 19 and the coil end 11d. The cross-sectional area of the cooling oil flow is smaller in the flow path 19e than in the flow path 17. The cooling oil flowing in from the inflow port 16 is ejected from the flow path 19e toward the coil end 11d. The cooling oil that has passed through the coil end 11d is stored in the oil pan 30. The head member 19 has a plurality of flow paths 19e depending on the axial position and the circumferential position of the coil end 11d. The plurality of flow paths 19e cover the entire axial position and circumferential position of the coil end 11d, and the entire axial position and circumferential position of the coil end 11d can be cooled by the cooling oil.

The head portion 19b has a flow path 19d. The flow path 19d is connected to the flow path 19h and extends to the other side in the axial direction. The cross-sectional area of the cooling oil flow is smaller in the flow path 19d than in the flow path 17. The cooling oil flowing in from the inflow port 16 is ejected from the flow path 19d toward the bearing 51. The cooling oil that has passed through the bearing 51 is stored in the oil pan 30. The head member 19 has a plurality of flow paths 19d according to the circumferential position of the bearing 51. The plurality of flow paths 19d cover the entire circumferential position of the bearing 51, and the entire circumferential position of the bearing 51 can be cooled by the cooling oil.

According to the present embodiment, since the

head members

18 and 19 are fixed to the

openings

17a and 17b which are the openings on the coil ends 11c and 11d side of the frame 13, the cooling oil corresponding to the shapes of the coil ends 11c and 11d can be used. The spouts (flow

paths

18e, 19e) may be provided in the

head members

18 and 19, and the frame 13 can be shared by the stators 11 having a plurality of types.

Further, since the

head members

18 and 19 are dedicated members and small members, it is easy to process the spouts (flow

paths

18e and 19e) according to the shapes of the coil ends 11c and 11d. Cooling oil can be ejected according to the shape of the coil end simply by exchanging the head member for each of the coil ends having a plurality of types of shapes.

According to the present embodiment, the through holes (flow

paths

18d, 18e, 19d, 19e) of the

head members

18 and 19 are smaller than the diameter of the oil passage (flow path 17) (the cross-sectional area of the flow is small), and therefore penetrate through. Oil can be ejected vigorously from the holes, and the coil ends 11c and 11d can be cooled efficiently.

According to the present embodiment, since the

head members

18 and 19 are located above the coil ends 11c and 11d in the vertical direction, oil can be ejected to the coil ends 11c and 11d without resisting gravity as much as possible, and the coil ends can be ejected. 11c and 11d can be cooled efficiently.

According to the present embodiment, the through holes (flow

paths

18e and 19e) extend in a direction parallel to the straight line connecting the

head members

18 and 19 and the coil ends 11c and 11d, and thus the directions toward the coil ends 11c and 11d. The oil can be ejected to the coil ends 11c and 11d, and the coil ends 11c and 11d can be efficiently cooled.

According to the present embodiment, since the

head members

18 and 19 have bearing cooling through holes (flow

paths

18d and 19d), the

bearings

41 and 51 can be cooled by the oil injected from the bearing cooling through holes. You can.

The present invention is not limited to the above embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention. In addition, the embodiments disclosed this time should be considered to be exemplary and not restrictive in all respects. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

This application claims priority based on Japanese Patent Application No. 2020-048741, which is a Japanese patent application filed on March 19, 2020, and incorporates all the contents described in the Japanese patent application.

10 ... motor, 11 ... stator, 12 ... rotor, 13 ... frame, 18 ... head member, 19 ... head member

Claims

A stator having a stator core and a coil wound around the stator core,
A rotor arranged so as to face the stator via an air gap,
A frame that covers the stator from the outside in the radial direction,
With
The coil has a first coil end that projects axially to one side of the stator core.
The frame has a first flow path that penetrates from the radial outer inflow port to the first axial opening on one side.
Further comprising a first head member having a second flow path connected to the first opening and penetrating towards the first coil end.
Rotating machine.
The coil has a second coil end that projects axially to the other side of the stator core.
The first flow path penetrates from the first opening to the second opening on the other side in the axial direction.
Further comprising a second head member having a third flow path connected to the second opening and penetrating towards the second coil end.
The rotating machine according to claim 1.
The first head member is fixed to the frame on the upper side in the vertical direction of the first coil end.
The second head member is fixed to the frame on the upper side of the second coil end in the vertical direction.
The rotating machine according to claim 2.
The second flow path is connected to a fourth flow path extending axially from the first opening to one side in the axial direction, and the first head member and the first coil end. Has a fifth flow path, which extends in a direction parallel to the straight line connecting the
The third flow path is connected to the sixth flow path extending from the second opening to the other side in the axial direction and the sixth flow path, and the second head member and the second coil end. Has a seventh flow path, which extends in a direction parallel to the straight line connecting the
The rotating machine according to claim 2 or 3.
The first flow path, the second flow path, and the third flow path are flow paths through which the cooling medium flowing in from the inflow port flows.
The cross-sectional area of the flow of the cooling medium is such that the fifth flow path is smaller than the first flow path and the seventh flow path is smaller than the first flow path.
The first head member has a plurality of the fifth flow paths.
The second head member has a plurality of the seventh flow paths.
The rotating machine according to claim 4.
A shaft arranged at the center of rotation of the rotor, a first bearing that pivotally supports the shaft on one side in the axial direction, and a second bearing that pivotally supports the shaft on the other side in the axial direction are further provided.
The first head member has an eighth flow path that ejects a cooling medium toward the first bearing.
The second head member has a ninth flow path that ejects a cooling medium toward the second bearing.
The rotating machine according to any one of claims 2 to 5.