Stator core with cooling channels

Abstract

The present invention provides a stator core with a cooling channel. A coolant channel (L) for allowing a coolant to pass through is formed inside the stator core. A plurality of end oil injection channels (L0) are formed at both axial ends of the stator core. The end oil injection channels (L0) communicate with the coolant channel (L). The coolant channel (L) forms a cylindrical envelope range inside the stator core. When the stator core is installed in place, in a cross-sectional circle perpendicular to the axial direction of the stator core, the end oil injection channels (L0) are only located in the upper semi-circular part of the cross-sectional circle. According to the end oil injection channels of the present application being only located in the upper semi-circular part of the stator cross-sectional circle, under the same coolant flow rate, the amount of coolant sprayed onto the winding wire package is larger. This part of the coolant can rely on gravity to be distributed to the entire winding wire package after spraying, making the utilization of the coolant more sufficient.

Description

Technical Field

[0001] The present invention relates to the field of motors, and more particularly to a stator core with cooling channels. Background Art

[0002] The applicant once proposed a stator core in a prior application with the application number CN202411365264.7. The slots in the second lamination described in this application have inner extensions, and the inner extensions are used to divert the coolant to a position near the end winding package and with relatively large gravitational potential energy to provide a better cooling effect. However, it is found in actual applications that the cooling effect of the coolant sprayed on the winding package in the lower half of the stator cross-section still needs to be improved. Summary of the Invention

[0003] The purpose of the present invention is to overcome or at least mitigate the deficiencies of the above-mentioned prior art, and to provide a stator core with cooling channels.

[0004] The present invention provides a stator core with cooling channels. A coolant channel for allowing the coolant to pass through is formed inside the stator core. A plurality of end oil injection channels are formed at both axial ends of the stator core, and the end oil injection channels communicate with the coolant channel.

[0005] The coolant channel forms a cylindrical envelope range inside the stator core.

[0006] When the stator core is installed in place, on the cross-sectional circle perpendicular to the axial direction of the stator core, the end oil injection channels are only located in the upper semi-circular part of the cross-sectional circle.

[0007] In at least one embodiment, when the stator core is installed in place, on the cross-sectional circle perpendicular to the axial direction of the stator core, the end oil injection channels are only located in the fan-shaped area with a central angle of 120° in the upper middle part of the cross-sectional circle.

[0008] In at least one embodiment, along the spraying direction of the coolant, the end oil injection channels are inclined from the outer peripheral side to the inner peripheral side.

[0009] In at least one embodiment, the stator core includes a core body and end laminations. One set of end laminations is provided at each axial end of the core body. The coolant channel is formed in the yoke part of the core body, and the end oil injection channels are formed in the yoke part of the end laminations.

[0010] Each set of end laminations includes a plurality of identical laminations, and each lamination includes multiple groups of oil holes. The radial distances of different groups of oil holes from the edge of the lamination are different.

[0011] Among the end laminations in each group, the oil holes that are axially adjacent and circumferentially aligned in two adjacent laminations belong to different groups of oil holes.

[0012] In at least one embodiment, the stator core includes a core body and end laminations. A set of the end laminations is provided at each of the axial ends of the core body. The coolant channel is formed in the yoke portion of the core body, and the end oil injection channel is formed in the yoke portion of the end laminations.

[0013] A plurality of main oil holes and a plurality of flow-accumulating oil holes are formed at the axial ends of the core body. Both the main oil holes and the flow-accumulating oil holes communicate with the coolant channel.

[0014] The flow-accumulating oil holes communicate with the end oil injection channel, and the main oil holes are blocked by the end laminations and do not communicate with the end oil injection channel.

[0015] In at least one embodiment, the coolant channel includes a plurality of sub-channels and is in a labyrinth shape. Adjacent sub-channels are not axially or circumferentially aligned.

[0016] The flow-accumulating oil hole includes a circumferential section and an inner guiding section that are connected. The inner guiding section is located radially inside the circumferential section.

[0017] The circumferential section of each flow-accumulating oil hole communicates with a plurality of sub-channels that are circumferentially adjacent, and the inner guiding section of each flow-accumulating oil hole communicates with one end oil injection channel.

[0018] In at least one embodiment, the liquid inlet of the coolant channel is located at the axial middle of the core body, and,

[0019] When the stator core is installed in place, the liquid inlet is located at the lowest position of the core body.

[0020] In at least one embodiment, the axial length of the sub-channel located in the middle region in the axial direction is greater than the axial length of the sub-channel close to the end in the axial direction.

[0021] In at least one embodiment, the circumferential width of the sub-channel close to the liquid inlet in the radial direction is greater than the circumferential width of the sub-channel far from the liquid inlet in the radial direction.

[0022] In at least one embodiment, the circumferential width of the sub-channel located at the outermost end in the axial direction is greater than the circumferential width of the sub-channel on the axial inner side.

[0023] According to the present invention, the end oil injection channel is only located in the upper semi-circular part of the stator cross-sectional circle, so that under the same coolant flow rate, the amount of coolant sprayed onto the winding wire package is larger. This part of the coolant can rely on gravity to be distributed to the entire winding wire package after spraying, making the utilization of the coolant more sufficient. Description of the Drawings

[0024] Figure 1 is a schematic view of a stator core according to an embodiment of the present application.

[0025] Figure 2 is Figure 1 a schematic view of the axially sectioned

[0026] Figure 3 is Figure 1 a partially exploded schematic view of , where the end laminations at one axial end are not shown.

[0027] Figure 4 is Figure 1 a schematic view of the core body of the stator core in axially sectioned along the circumferential direction.

[0028] Figure 5 is Figure 4 a partially enlarged schematic view of the corresponding partially sectioned stator core.

[0029] Figure 6 is Figure 3 a partially enlarged schematic view of the core body of the corresponding stator core axially sectioned along the circumferential direction.

[0030] Figure 7 is a schematic view of the cross-sections of the core body of the stator core according to an embodiment of the present application in three different sections.

[0031] Figure 8 is a schematic view of the stator core according to an embodiment of the present application with the end laminations at one end removed.

[0032] Figure 9 is a schematic view of the cross-section of the core body of the stator core according to an embodiment of the present application at the second section of the body.

[0033] Figure 10 is a schematic sketch of the cross-sections of three end laminations of the stator core according to an embodiment of the present application.

[0034] Figure 11 is a schematic sketch of the partially sectioned stator core according to an embodiment of the present application.

[0035] Figure 12 is a schematic sketch of the cross-sections of three end laminations of the stator core according to another possible embodiment of the present application.

[0036] Description of the Reference Numerals:

[0037] S0 Core body; S01 First section of the body; S02 Second section of the body; S03 Third section of the body;

[0038] End punching piece of S1; Outer punching piece of S11; Intermediate punching piece of S12; Inner punching piece of S13;

[0039] First region of R1; Second region of R2; Third region of R3;

[0040] Oil hole of the first region of H1; Oil hole of the second region of H2; Oil hole of the third region of H3;

[0041] Main body oil hole of H4; Converging oil hole of H5; Circumferential section of H51; Inner leading section of H52;

[0042] Coolant channel of L; End oil injection channel of L0; Liquid inlet of E;

[0043] Top channel clearance of D1; Bottom channel clearance of D2; Middle channel clearance of D3; End channel clearance of D4. Detailed implementation mode

[0044] The exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present invention, rather than to exhaust all possible ways of the present invention, nor to limit the scope of the present invention.

[0045] Refer to Figures 1 to 12 , and introduce a stator core with a cooling channel according to an embodiment of the present application.

[0046] Unless otherwise specified, the following referred axial direction, radial direction and circumferential direction are all referenced with the axial direction, radial direction and circumferential direction of the stator core. The state where the following referred stator core is installed in place means the position of the motor in the working state under normal circumstances. In this state, the axial direction of the motor is horizontally arranged.

[0047] Refer to Figures 1 to 5 , the stator core provided in this embodiment includes a core body S0 and two groups of end punching pieces S1 located at both axial ends of the core body S0.

[0048] Each group of end punching pieces S1 includes three punching pieces. From the axial outer side to the axial inner side, they are the outer punching piece S11, the intermediate punching piece S12 and the inner punching piece S13 in sequence.

[0049] The core body S0 is composed of multiple sections, and each section is formed by stacking multiple punching pieces. It should be understood that in other possible embodiments, each section may also be an integrally formed part, which is, for example, pressed from a soft magnetic material. In this embodiment, the multiple sections of the core body S0 are divided into a main body first section S01 located in the middle of the axis, a main body second section S02 located at the axial end, and multiple main body third sections S03 located between the main body first section S01 and the main body second section S02.

[0050] The yoke of each section forms a plurality of main oil holes H4 distributed circumferentially. The main oil holes H4 on axially adjacent sections communicate with each other in a manner that they are not completely aligned circumferentially, so that a zigzag maze-like coolant channel L is formed inside the iron core body S0. The coolant channel L almost covers the iron core body S0 both circumferentially and axially, forming a cylindrical envelope range. The coolant can flow in the coolant channel L to take away the heat of the stator core.

[0051] Some of the oil holes on the second main body section S02 of the main body are special, and these oil holes are called converging oil holes H5. The converging oil holes H5 communicate with the coolant channel L and serve as the channels for the coolant to finally exit at the end of the iron core body S0, so as to convey the coolant to the winding wire package (not shown in the figure) located at the end of the stator core and take away the heat of the winding wire package. Figure 5 The dotted arrow a in shows the situation where the coolant exits via the converging oil holes H5.

[0052] In the following introduction, readers can understand that the main oil holes H4 on the second main body section S02 of the main body will be blocked by the end punching S1 and the coolant is not allowed to exit from the end via the main oil holes H4. Refer to Figure 5 In the dotted arrow b in, the significance of the existence of the main oil holes H4 on the second main body section S02 of the main body is that the coolant flows uniformly circumferentially in the channels formed by these oil holes with one end closed, so that the second main body section S02 can contact the coolant throughout the circumference and provide good cooling for the second main body section S02.

[0053] The liquid inlet E of the coolant channel L is arranged on the first main body section S01. When the stator core is in the installed position, the liquid inlet E is located at the exact middle position of the lower part of the iron core body S0, or at the lowest position of the iron core body S0. The coolant enters the iron core body S0 from the lower part and then flows both circumferentially and axially in the coolant channel L. This flow sequence from bottom to top and from the axial middle to both sides is more conducive to the uniform distribution of the coolant in the coolant channel L, so as to provide uniform cooling for each area of the iron core body S0. Figure 4 The dotted arrows in are used to indicate the flow direction of the coolant.

[0054] Refer to Figures 4 to 6 , in this embodiment, the coolant channel L also distributes in different sizes at different positions, so as to guide the coolant to flow smoothly from the liquid inlet E to the upper part and the two axial ends of the iron core body S0. The arrow U in the figure points to the upper part of the stator core in the installed position, hereinafter referred to as the upper part.

[0055] Hereinafter, the region where each oil hole of each section is located is referred to as a sub-channel of the coolant passage L. Among the multiple sections of the iron core body S0, the axial length of the first main section S01 is the largest. This makes the liquid storage capacity of the sub-channel on the first main section S01 greater than that of the sub-channel on the third main section S03 connected thereto, and the coolant entering the coolant passage L is pressure-stabilized in these sub-channels. The pressure of the coolant in these sub-channels is sufficient to squeeze the coolant towards the surroundings, so that the coolant has a tendency to flow towards both axial ends after entering the first main section S01. In other possible embodiments, the axial lengths of the sub-channels can also be set as follows: the axial length of the sub-channel located in the middle region in the axial direction is greater than the axial length of the sub-channel close to the end in the axial direction.

[0056] Next, observe the width of each sub-channel in the circumferential direction.

[0057] On the one hand, for the same section of the iron core body S0, the circumferential widths of the sub-channels located in the region of the liquid inlet E (also called the bottom channel) and the sub-channels directly above the liquid inlet E (also called the top channel) are greater than those of other sub-channels. In the figure, it is shown that both the bottom channel gap D2 and the top channel gap D1 are greater than the middle channel gap D3. This makes the liquid storage capacity of the sub-channels near the liquid inlet E greater than that of the sub-channels on its circumferential sides, so that the coolant has a tendency to flow towards both circumferential sides after entering the liquid inlet E; and the liquid storage capacity of the top sub-channels increases again, forming a temporary liquid storage area at the top. The coolant in this part has greater gravitational potential energy and has greater kinetic energy when ejecting from the end of the stator core subsequently. In other possible embodiments, the circumferential widths of the sub-channels can also be set as follows: the circumferential width of the sub-channel close to the liquid inlet E in the radial direction is greater than the circumferential width of the sub-channel far from the liquid inlet E in the radial direction.

[0058] On the other hand, for different sections, or rather, for sub-channels at different positions in the axial direction, they satisfy the following setting: the circumferential width of the sub-channel located at the outermost end in the axial direction is greater than the circumferential width of the sub-channel on the axial inner side (except for the sub-channels at the liquid inlet E and above it on the first main section S01). In the figure, it is shown that the end channel gap D4 is greater than the middle channel gap D3. This makes the liquid storage capacity in the end sub-channels increase again, so that the coolant in this part has greater gravitational potential energy and has greater kinetic energy when ejecting from the end of the stator core subsequently.

[0059] Next, refer to Figures 7 to 9 to further illustrate the specific position and structure of the flow-accumulating oil hole H5.

[0060] Refer to Figure 7, in the posture where the stator core is installed in place, a cross-section perpendicular to the axial direction of the stator core can be made to obtain a cross-sectional circle. The converging oil hole H5 is located in a sector area with a central angle of 120° in the upper middle of the cross-sectional circle.

[0061] Selecting the central angle of the sector area as 120° is particularly applicable to the case where the number of slots in the stator core is a multiple of 3, such as 48 or 54. This will be more easily understood when introducing the structure of the end punching S1 below. It should be understood that in the case where the number of slots is other quantities, the central angle of the sector area can also be adjusted appropriately, for example, it can be selected between 90° and 180°. According to the principle of the present application to make the externally ejected coolant contact the winding wire package as much as possible, the sector area is only located in the upper semi-circle of the cross-sectional circle.

[0062] Each converging oil hole H5 is approximately T-shaped or approximately sickle-shaped, and it includes a circumferential section H51 and an inner leading section H52. The circumferential section H51 is arc-shaped on the cross-sectional circle, and the inner leading section H52 is located radially inside the circumferential section H51. For the converging oil hole H5 at the exact middle of the highest point of the cross-sectional circle, the inner leading section H52 is preferably connected to the middle part in the circumferential direction of the circumferential section H51, that is, the inner leading section H52 is located at the highest point radially inside the circumferential section H51. For the converging oil holes H5 at the two circumferential ends of the sector area, the inner leading section H52 is preferably connected to the outermost ends in the circumferential direction of the circumferential section H51, or rather, the inner leading section H52 is connected to the lowest point of the circumferential section H51, which makes the ejection area of the coolant in the designed 120° sector area. For other converging oil holes H5, the inner leading section H52 can be connected to any position in the circumferential direction of the circumferential section H51; preferably, the circumferential intervals between adjacent inner leading sections H52 are approximately uniform to make the ejected coolant distribute more evenly.

[0063] Next, in combination with Figure 1 、 Figure 10 and Figure 11 introduce the specific structure of the end punching S1 and the characteristics of the end oil injection channel L0 provided by it.

[0064] Referring to Figure 1 , the end punching S1 is divided into three sector areas in the circumferential direction, and the central angle corresponding to each sector area is 120°. In the posture where the stator core is installed in place, the first area R1 is the upper positive area of the end punching S1 (with the same phase as the area where the converging oil hole H5 is located), the second area R2 is the lower left area of the end punching S1, and the third area R3 is the lower right area of the end punching S1.

[0065] Figure 10The cross-sectional shapes of the outer punching piece S11, the middle punching piece S12, and the inner punching piece S13 are schematically shown respectively, and the shapes of only one oil hole in each sector area are shown in a simplified form, which are the oil hole H1 in the first area, the oil hole H2 in the second area, and the oil hole H3 in the third area. It should be understood that there are actually multiple oil holes in each sector area, the oil holes in the same sector area have the same radial position, and the radial positions of the oil holes in different areas are different. It should be understood that Figure 10 The shape and size ratio of the oil holes in are not equal to the actual situation. In this embodiment, the oil holes on the end punching piece S1 are generally oblong, which has the function of guiding the outgoing coolant radially inward; however, the oblong shape is not necessary, and the oil holes on the end punching piece S1 can also have other shapes.

[0066] The distance between the oil hole H1 in the first area R1 and the edge of the end punching piece S1 is d1, the distance between the oil hole H2 in the second area R2 and the edge of the end punching piece S1 is d2, and the distance between the oil hole H3 in the third area R3 and the edge of the end punching piece S1 is d3, where d1 > d2 > d3.

[0067] From Figure 10 it can be found that the outer punching piece S11, the middle punching piece S12, and the inner punching piece S13 are actually punching pieces with exactly the same structure, but during installation, their respective phase angles relative to the iron core body S0 are different. Taking Figure 10 as a reference, the middle punching piece S12 rotates counterclockwise by 120° relative to the outer punching piece S11, and the inner punching piece S13 rotates counterclockwise by 120° relative to the middle punching piece S12.

[0068] Referring to Figure 11 , after the three punching pieces are stacked together, the oil hole H1 in the first area of the outer punching piece S11, the oil hole H2 in the second area of the middle punching piece S12, and the oil hole H3 in the third area of the inner punching piece S13 are aligned in the circumferential direction, but these three oil holes form a stepped-connected channel in the radial direction, which will be referred to as the end oil injection channel L0 below. Along the spraying direction of the coolant ( Figure 11 the dotted arrow in represents the spraying direction of the coolant), the end oil injection channel L0 inclines from the outer peripheral side to the inner peripheral side, so as to spray the coolant to the winding wire package located inside the end of the stator core.

[0069] So far, the reader can also understand that in this embodiment, by setting oil holes in three areas on the end punching piece S1 and installing the three end punching pieces S1 in a way of deflecting the phase angle, the function of forming an inclined end oil injection channel L0 with one kind of punching piece structure is realized.

[0070] As mentioned above when introducing the oil - collecting hole H5, the solution of dividing the end punching sheet S1 into three equal - sector regions to arrange oil holes with different positions in this embodiment is particularly applicable to the case where the number of slots in the stator core is a multiple of 3, such as when the number of slots is 48 or 54. In the case where the number of slots is other values, the number of sector regions, the degree of the central angle, and the number of end punching sheets S1 in each group can also be adjusted appropriately. Generally, the number of sector regions on each end punching sheet S1 is equal to the number of punching sheets in a group of end punching sheets S1. In addition, the division of the sector regions of different oil holes on the end punching sheet S1 is matched with the division of the sector region where the oil - collecting hole H5 is located.

[0071] It is worth noting that only the oil hole H3 in the third region on the inner punching sheet S13 is connected to the coolant channel L. The oil holes H1 in the first region and H2 in the second region on the inner punching sheet S13 are not connected to the coolant channel located in the iron - core body S0 on the axial inner side. The reason has been mentioned above, because the main oil hole H4 on the second section S02 of the main body will be blocked by the end punching sheet S1 (specifically, the inner punching sheet S13). Therefore, the coolant finally only shoots out from the first region R1 of the outer punching sheet S11. The coolant in this region falls to the upper part of the winding wire bundle and flows along the annular winding wire bundle under the action of gravity to dissipate heat from the winding wire bundle. On the one hand, this ensures that the winding wire bundle can come into contact with the coolant; on the other hand, compared with the scheme of discharging coolant from the entire annular region of the outer punching sheet S13, when the flow rate of the coolant is certain, more coolant can be provided in the first region R1, so that the whole winding wire bundle can come into contact with more coolant, or the amount of coolant that does not hit the winding wire bundle is minimized, thereby improving the cooling effect.

[0072] Refer to Figure 12 , since it is only necessary to discharge coolant from the upper 1 / 3 region of the outer punching sheet S13, in other possible embodiments, oil holes can also be provided only in the 1 / 3 sector region of each end punching sheet S1, that is, the outer punching sheet S11 only has the oil hole H1 in the first region, the middle punching sheet S12 only has the oil hole H2 in the second region, and the inner punching sheet S13 only has the oil hole H3 in the third region. It can be found that this setting method makes the end punching sheet S1 have three different structures, which will increase the number of types of parts, increase the mold cost and the complexity of parts management.

[0073] It should be understood that the above - mentioned embodiments and some of their aspects or features can be appropriately combined.

[0074] The present invention has at least one of the following advantages:

[0075] (i) The end oil injection channels are only in the upper semi-circular part of the stator cross-sectional circle, especially within the upper 120° circumferential range. This enables a larger amount of coolant to be sprayed onto the winding coil pack under the same coolant flow rate. After spraying, this part of the coolant can rely on gravity to distribute to the entire winding coil pack, making the utilization of the coolant more sufficient and the cooling efficiency higher.

[0076] (ii) The end laminations are stacked by rotating the phase angle to form end oil injection channels that incline radially inward. The end lamination structures are the same, reducing the complexity of the parts.

[0077] (iii) The maze-like coolant channels enable the coolant to be evenly distributed in the approximate outer peripheral part of the stator core, providing good cooling for the core.

[0078] (iv) The channel lengths and / or widths of the coolant channels are arranged differently at different positions inside the core, which can guide the coolant to flow upward and to both ends after entering from the liquid inlet located at the lower part of the stator core.

[0079] Of course, the present invention is not limited to the above embodiments. Those skilled in the art can make various modifications to the above embodiments of the present invention under the teaching of the present invention without departing from the scope of the present invention.

Claims

1. A stator core having a cooling channel, wherein a cooling liquid channel (L) for passing a cooling liquid is formed inside the stator core, and a plurality of end oil injection channels (L0) are formed at two axial ends of the stator core, and the end oil injection channels (L0) are connected to the cooling liquid channel (L), characterized in that: The coolant channel (L) forms a cylindrical envelope inside the stator core. When the stator core is installed in place, on a cross-sectional circle perpendicular to the axial direction of the stator core, the end oil injection channel (L0) is only located in the upper semicircle of the cross-sectional circle. The stator core comprises a core body (S0) and two groups of end punching sheets (S1) located at two axial ends of the core body (S0), the coolant channel (L) is formed at the yoke of the core body (S0), and the end oil injection channel (L0) is formed at the yoke of the end punching sheet (S1). When the stator core is in the installed position, the liquid inlet (E) of the coolant channel (L) is located at the lowest point of the core body (S0). The axial length of the sub-channel of the coolant channel (L) located in the middle area in the axial direction is greater than the axial length of the sub-channel close to the end in the axial direction, and the circumferential width of the sub-channel close to the liquid inlet (E) in the radial direction is greater than the circumferential width of the sub-channel far from the liquid inlet (E) in the radial direction.

2. The stator core with cooling channel according to claim 1, characterized in that: When the stator core is installed in place, on a cross-sectional circle perpendicular to the axial direction of the stator core, the end oil injection channel (L0) is only located in a sector-shaped area with a central angle of 120° in the upper middle of the cross-sectional circle.

3. The stator core with cooling channel according to claim 1, characterized in that: Along the spraying direction of the coolant, the end oil spray channel (L0) is inclined from the outer peripheral side to the inner peripheral side.

4. The stator core with cooling channel according to claim 3, characterized in that: The stator core comprises a core body (S0) and end punching sheets (S1), a group of end punching sheets (S1) are respectively provided at two axial ends of the core body (S0), the coolant channel (L) is formed at the yoke of the core body (S0), and the end oil injection channel (L0) is formed at the yoke of the end punching sheet (S1). Each group of end punching sheets (S1) comprises a plurality of punching sheets with the same structure, each of the punching sheets comprises a plurality of groups of oil holes, and different groups of oil holes have different radial distances from the edge of the punching sheet. The oil holes aligned in the circumferential direction of two axially adjacent punching plates in each group of the end punching plates (S1) belong to different groups of oil holes.

5. The stator core with cooling channel according to claim 1, characterized in that: The axial end of the core body (S0) is formed with a plurality of main body oil holes (H4) and a plurality of flow-gathering oil holes (H5), and both the main body oil holes (H4) and the flow-gathering oil holes (H5) are in communication with the coolant channel (L). The converging oil hole (H5) is connected to the end oil injection channel (L0), and the main body oil hole (H4) is blocked by the end punching sheet (S1) and is not connected to the end oil injection channel (L0).

6. The stator core with cooling channels according to claim 5, characterized in that: The coolant channel (L) is in a maze shape, and adjacent sub-channels are not aligned in the axial direction or the circumferential direction. The oil converging hole (H5) comprises a connected circumferential section (H51) and an inner leading section (H52), wherein the inner leading section (H52) is located radially inward of the circumferential section (H51). The circumferential section (H51) of each of the oil converging holes (H5) is connected to a plurality of circumferentially adjacent sub-channels, and the inner lead section (H52) of each of the oil converging holes (H5) is connected to one of the end oil injection channels (L0).

7. The stator core with cooling channels according to claim 6, characterized in that: The circumferential width of the sub-channel located at the endmost portion in the axial direction is greater than the circumferential width of the axially inner sub-channel.

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