Motor stator and motor

Abstract

The utility model provides a motor stator and a motor, and belongs to the motor field, the motor stator comprises a stator body, a first cooling flow channel and a second cooling flow channel, two axial ends of the stator body are respectively a first end face and a second end face; the first end face is provided with a first inner ring flow channel opening and a first outer ring flow channel opening, the first inner ring flow channel opening and the first outer ring flow channel opening are distributed in the circumferential direction of the stator body, and the first inner ring flow channel opening is closer to the geometric center of the first end face relative to the first outer ring flow channel opening. The second end face is provided with a second inner ring flow channel opening and a second outer ring flow channel opening. The second inner ring flow channel opening and the second outer ring flow channel opening are distributed in the circumferential direction of the stator body, and the second inner ring flow channel opening is closer to the geometric center of the second end face relative to the second outer ring flow channel opening. The first cooling flow channel is communicated with the first inner ring flow channel opening and the corresponding second outer ring flow channel opening; and the second cooling flow channels are communicated with the first outer ring flow channel openings and the corresponding second inner ring flow channel openings, so that the heat dissipation and cooling effects on the motor stator are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and particularly relates to a motor stator and a motor. Background Art

[0002] With the continuous development of new energy vehicles, higher requirements are put forward for the driving ability of new energy vehicles. The motors of new energy vehicles need to continuously increase the rotational speed, torque density, and power density on the premise that the volume is gradually compressed. The higher the rotational speed, torque density, and power density of the motor, the higher the heat generated by it. At present, most of the motors of new energy vehicles are permanent magnet motors, and about 30% - 40% of the permanent magnet motors fail due to excessive temperature rise of the motor. The excessive temperature rise of the motor leads to a decrease in operating efficiency, and the decrease in operating efficiency will further increase the temperature rise, thus forming a vicious cycle of continuous temperature rise of the motor. Therefore, the heat dissipation and cooling structure of the motor is crucial for the reliable, stable, and efficient operation of the motor.

[0003] At present, the cooling of motors is mainly divided into air cooling, water cooling, and oil cooling. The air cooling method is only applicable to the cooling of low-performance motors; there are certain defects in the water cooling method because the cooling water cannot directly contact the heat dissipation parts. The oil cooling method has become the first choice for the cooling of high-performance motors due to its natural electrical insulation, high degree of freedom in structural design, etc., but due to the specific structure of the motor stator, it is difficult to arrange the structure of the oil circuit. Currently, most motors dissipate heat from the stator of the motor through the water jackets inside and outside the housing and the annular water channels. Its main heat dissipation path is to dissipate heat from the motor through the motor housing and the surface of the iron core. However, there are problems such as a long heat transfer path and a large contact thermal resistance between the key heat-generating components inside the motor and the housing, resulting in low heat dissipation efficiency. At the same time, this motor heat dissipation method requires adding water channels to the housing, increasing the complexity of the housing process manufacturing, low processability, high production and manufacturing costs, and it is difficult to meet the requirements of lightweight design. Summary of the Utility Model

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide a motor stator and a motor, which are used to solve the problems such as low heat dissipation efficiency of the motor in the prior art.

[0005] To achieve the above purpose and other related purposes, the present utility model provides a motor stator, including:

[0006] A stator body, the two ends of the stator body along the axial direction are respectively a first end face and a second end face;

[0007] A first inner ring flow port and a first outer ring flow port are arranged on the first end face. The first inner ring flow port and the first outer ring flow port are both distributed along the circumferential direction of the stator body, and the first inner ring flow port is closer to the geometric center of the first end face than the first outer ring flow port;

[0008] The second end face is provided with a second inner ring flow port and a second outer ring flow port; both the second inner ring flow port and the second outer ring flow port are distributed circumferentially along the stator body, and the second inner ring flow port is closer to the geometric center of the second end face than the second outer ring flow port.

[0009] A first cooling flow channel, the first cooling flow channel extends axially and communicates the first inner ring flow port and the corresponding second outer ring flow port;

[0010] A second cooling flow channel, the second cooling flow channel extends axially and communicates the first outer ring flow port and the corresponding second inner ring flow port.

[0011] Optionally, the projections of the first cooling flow channel and the second cooling flow channel in the circumferential direction of the stator body intersect; and / or, the projections of the first cooling flow channel and the second cooling flow channel in the radial direction of the stator body intersect.

[0012] Optionally, the first inner ring flow port and the first outer ring flow port are offset or corresponding in the circumferential direction of the stator body, and the second inner ring flow port and the second outer ring flow port are offset or corresponding in the circumferential direction of the stator body.

[0013] Optionally, the first cooling flow channel and the second cooling flow channel are alternately arranged along the circumferential direction of the stator body.

[0014] Optionally, the first cooling flow channel and the second cooling flow channel are straight flow channels, arc-shaped flow channels or zigzag flow channels along their extending directions.

[0015] Optionally, the flowing directions of the cooling media contained in the first cooling flow channel and the second cooling flow channel are opposite.

[0016] Optionally, the stator body includes a plurality of stacked sheets stacked axially, each of the stacked sheets is provided with a first cooling hole forming the first cooling flow channel and a second cooling hole forming the second cooling flow channel; the plurality of stacked sheets stacked axially are divided into multiple groups along the axis, each group includes a plurality of the stacked sheets, in the same first cooling flow channel, the first cooling holes of the stacked sheets in the same group correspond axially, and the first cooling holes of the same first cooling flow channel of the adjacent two groups of stacked sheets are offset and communicated in the circumferential direction and / or the radial direction; in the same second cooling flow channel, the second cooling holes of the stacked sheets in the same group correspond axially, and the second cooling holes of the adjacent two groups of stacked sheets are offset and communicated in the circumferential direction and / or the radial direction.

[0017] Optionally, the stator body includes a plurality of stacked laminations stacked axially. Each lamination is provided with a first cooling hole forming the first cooling channel and a second cooling hole forming the second cooling channel; in the same first cooling channel, the first cooling holes of two adjacent laminations are offset and communicated in the circumferential and / or radial directions; in the same second cooling channel, the second cooling holes of two adjacent laminations are offset and communicated in the circumferential and / or radial directions.

[0018] Optionally, along the axial direction of the stator body, the part of the lamination that shields the first cooling hole or the second cooling hole of the adjacent lamination is the hole shielding part, and the unshielded part of the first cooling hole or the second cooling hole is the hole flow-through part. At the first cooling hole or the second cooling hole, the projected area of the hole shielding part along the axial direction of the stator body is less than or equal to the projected area of the hole flow-through part.

[0019] The present utility model also provides a motor, including the motor stator as described above.

[0020] As described above, a motor stator and a motor of the present utility model have the following beneficial effects:

[0021] By providing a first cooling channel and a second cooling channel on the stator body, and the first inner ring flow port is closer to the geometric center of the first end face than the first outer ring flow port, and the second inner ring flow port is closer to the geometric center of the second end face than the second outer ring flow port. Axially on the stator body, the first cooling channel and the second cooling channel are arranged to extend alternately in the radial direction of the stator body. While extending the cooling paths of the first cooling channel and the second cooling channel and the contact area between the stator body and the coolant, through the cooperation relationship between the first cooling channel and the second cooling channel, the heat dissipation and cooling effect of the stator body can be further improved, and at the same time, the uniformity of heat dissipation can be improved. Description of the Drawings

[0022] Figure 1 It is a top view of the motor stator according to the embodiment of the present utility model.

[0023] Figure 2 It is a structural schematic diagram of the motor stator in the embodiment of the present utility model.

[0024] Figure 3 is Figure 2 The partial structural schematic diagram at A in.

[0025] Figure 4 It is a sectional structural schematic diagram of the first cooling channel in the embodiment of the present utility model.

[0026] Figure 5 It is a sectional structural schematic diagram of the second cooling channel in the embodiment of the present utility model.

[0027] Figure 6 One of the perspective structure diagrams of the first cooling flow channel and the second cooling flow channel of the electronic stator in the embodiment of the present utility model.

[0028] Figure 7 The second of the perspective structure diagrams of the first cooling flow channel and the second cooling flow channel of the electronic stator in the embodiment of the present utility model.

[0029] Label description: 1. Stator body; 101. Central hole; 102. Groove; 2. First outer ring flow port; 3. First inner ring flow port; 4. First cooling flow channel; 5. Second cooling flow channel; 6. Laminated sheet; 7. First cooling hole; 8. Second cooling hole; 9. Second outer ring flow port; 10. Second inner ring flow port. Detailed implementation manners

[0030] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

[0031] Please refer to Figures 1 to 7 . It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limited conditions under which the present utility model can be implemented. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear description and are not used to limit the scope under which the present utility model can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present utility model can be implemented.

[0032] In order to be able to describe the present utility model in detail, a motor stator and a motor of the present utility model will be specifically described next:

[0033] Please combine with Figures 1 to 6As shown in the figure, the present utility model provides a motor stator, which includes a stator body 1, a first cooling channel 4 and a second cooling channel 5. The two ends of the stator body 1 along the axial direction are respectively a first end face and a second end face; a first inner ring flow port 3 and a first outer ring flow port 2 are arranged on the first end face. Both the first inner ring flow port 3 and the first outer ring flow port 2 are distributed along the circumferential direction of the stator body 1, and the first inner ring flow port 3 is closer to the geometric center of the first end face than the first outer ring flow port 2; a second inner ring flow port 10 and a second outer ring flow port 9 are arranged on the second end face; both the second inner ring flow port 10 and the second outer ring flow port 9 are distributed along the circumferential direction of the stator body 1, and the second inner ring flow port 10 is closer to the geometric center of the second end face than the second outer ring flow port 9; the first cooling channel 4 extends axially and communicates with the corresponding second outer ring flow port 9; the second cooling channel 5 extends axially and communicates with the corresponding second inner ring flow port 10. By arranging the first cooling channel 4 and the second cooling channel 5 on the stator body 1, and the first inner ring flow port 3 is closer to the geometric center of the first end face than the first outer ring flow port 2, and the second inner ring flow port 10 is closer to the geometric center of the second end face than the second outer ring flow port 9, in the axial direction of the stator body 1, the first cooling channel 4 and the second cooling channel 5 are arranged to extend staggeredly along the radial direction of the stator body 1. While extending the cooling paths of the first cooling channel 4 and the second cooling channel 5 and the contact area between the stator body 1 and the coolant, through the cooperation relationship between the first cooling channel 4 and the second cooling channel 5, the heat dissipation and cooling effect on the stator body 1 can be further improved.

[0034] The stator body 1 has a central hole 101 arranged along the axial direction of the stator body 1. The central hole 101 is coaxial with the stator body 1. The stator body 1 has an inner side surface close to the central hole 101 and an outer side surface far from the central hole 101. A plurality of grooves 102 are evenly arranged at circumferential intervals on the inner side surface of the stator body 1 along the circumferential direction of the stator body. Each groove 102 extends along the axial direction of the stator body 1. The grooves 102 are used for winding wires to form a stator winding.

[0035] In some embodiments, the mutually cooperating first cooling channel 4 and second cooling channel 5 form a set of cooling channel groups, and at least two sets of cooling channel groups are provided on the stator body 1, and the sets of cooling channel groups are arranged at intervals in the radial direction of the stator body 1. In other embodiments, a third cooling channel is further provided on the stator body 1. The third cooling channel has a third upper mating flow port on the first end face and a third lower mating flow port on the second end face. The third cooling channel intersects the projection of the first cooling channel 4 and / or the second cooling channel 5 in the circumferential direction of the stator body 1, or the third cooling channel intersects the projections of the first cooling channel 4 and / or the second cooling channel 5 in both the circumferential and radial directions of the stator body 1, or the third cooling channel intersects the projection of the first cooling channel 4 and / or the second cooling channel 5 in the radial direction of the stator body 1. The arrangement of the first cooling channel 4, the second cooling channel 5 or the third cooling channel on the stator body 1 can be adjusted according to the usage requirements.

[0036] Among them, the projections of the first cooling channel 4 and the second cooling channel 5 in the circumferential direction of the stator body 1 intersect; and / or, the projections of the first cooling channel 4 and the second cooling channel 5 in the radial direction of the stator body 1 intersect. With such an arrangement, the cooperation between the first cooling channel 4 and the second cooling channel 5 can be strengthened, thereby improving the cooling effect of the two on the stator body 1.

[0037] Among them, as Figures 4 to 7 shown, the first inner ring flow port 3 and the first outer ring flow port 2 are offset or corresponding in the circumferential direction of the stator body 1, and the second inner ring flow port 10 and the second outer ring flow port 9 are offset or corresponding in the circumferential direction of the stator body 1. It should be noted that the above-mentioned offset means that the connection line between the first inner ring flow port 3 and the first outer ring flow port 2 intersects the radial direction of the stator body 1, and the connection line between the second inner ring flow port 10 and the second outer ring flow port 9 intersects the radial direction of the stator body 1; the above-mentioned correspondence means that the connection line between the first inner ring flow port 3 and the first outer ring flow port 2 extends along the radial direction of the stator body 1, and the connection line between the second inner ring flow port 10 and the second outer ring flow port 9 extends along the radial direction of the stator body 1.

[0038] In this embodiment, the first inner ring flow ports 3 and the first outer ring flow ports 2 are both evenly spaced along the circumferential direction of the stator body 1, and the first inner ring flow ports 3 and the first outer ring flow ports 2 are staggeredly arranged in the circumferential direction of the stator body 1. The second inner ring flow ports 10 and the second outer ring flow ports 9 are both evenly spaced along the circumferential direction of the stator body 1, and the second inner ring flow ports 10 and the second outer ring flow ports 9 are staggeredly arranged in the circumferential direction of the stator body 1. By setting like this, to a certain extent, the cooling paths of the first cooling channels 4 and the second cooling channels 5 can be extended, thereby increasing the contact area between the first cooling channels 4 and the second cooling channels 5 and the coolant, and improving the cooling effect on the stator body 1. In some embodiments, the first inner ring flow ports 3 and the first outer ring flow ports 2 are correspondingly arranged in the circumferential direction of the stator body 1, and the second inner ring flow ports 10 and the second outer ring flow ports 9 are correspondingly arranged in the circumferential direction of the stator body 1. By setting like this, the complexity during the processing and assembly of the stator body 1 can be reduced, and at the same time, the cooperation closeness between the first cooling channels 4 and the second cooling channels 5 can be enhanced, thereby improving the cooling effect on the stator body 1. In some other embodiments, the first inner ring flow ports 3 and the first outer ring flow ports 2 are arranged in a staggered manner in the circumferential direction of the stator body 1, and the second inner ring flow ports 10 and the second outer ring flow ports 9 are correspondingly arranged in the circumferential direction of the stator body 1. On the stator body 1, the relative positional relationship between the first inner ring flow ports 3 and the first outer ring flow ports 2 and between the second inner ring flow ports 10 and the second outer ring flow ports 9 can be adjusted according to actual usage requirements.

[0039] In this embodiment, the flow directions of the cooling media in the first cooling channels 4 and the second cooling channels 5 are opposite. Since the first inner ring flow ports 3 are closer to the geometric center of the first end face than the first outer ring flow ports 2, the second inner ring flow ports 10 are closer to the geometric center of the second end face than the second outer ring flow ports 9, and the projections of the first cooling channels 4 and the second cooling channels 5 in the circumferential direction of the stator body 1 intersect, it can be understood that the temperature of the coolant will rise slowly after entering the stator body 1. Therefore, through the above settings, the axial cooling uniformity of the stator body 1 can be improved.

[0040] In some embodiments, the first end face is evenly divided into a plurality of distribution regions along the circumferential direction. Each distribution region evenly divides the first inner ring flow ports 3 and the first outer ring flow ports 2, and each distribution region includes at least one first inner ring flow port 3 and at least one first outer ring flow port 2. The number of distribution regions is an even number. In the same distribution region, the second cooling channels 5 corresponding to the first inner ring flow ports 3 and the first cooling channels 4 corresponding to the first outer ring flow ports 2 form a group of cooling channels. The flow directions of the cooling media in the same group of cooling channels are the same; in adjacent distribution regions, the flow directions of the cooling media in different cooling channel groups are opposite.

[0041] Among them, the first cooling channel 4 and the second cooling channel 5 are arranged alternately along the circumferential direction of the stator body 1, which can improve the fitting tightness between the first cooling channel 4 and the second cooling channel 5, thereby enhancing the cooling effect of the first cooling channel 4 and the second cooling channel 5 on the stator body 1.

[0042] In this embodiment, as Figures 3 to 4 shown, the stator body 1 includes a plurality of stacked sheets 6 stacked along the axial direction. Each stacked sheet 6 is provided with a first cooling hole 7 forming the first cooling channel 4 and a second cooling hole 8 forming the second cooling channel 5; the plurality of stacked sheets 6 stacked along the axial direction are divided into multiple groups, and each group includes a plurality of stacked sheets 6. In the same first cooling channel 4, the first cooling holes 7 of the stacked sheets 6 in the same group correspond axially, and the first cooling holes 7 of the same first cooling channel 4 of adjacent two groups of stacked sheets 6 are offset and communicated in the circumferential and / or radial directions; in the same second cooling channel 5, the second cooling holes 8 of the stacked sheets 6 in the same group correspond axially, and the second cooling holes 8 of adjacent two groups of stacked sheets 6 are offset and communicated in the circumferential and / or radial directions. The stacked sheet 6 can be formed by stamping, and its material can be silicon carbide, soft magnetic alloy or composite material, etc. The manufacturing process and material of the stacked sheet 6 can be adjusted according to actual usage requirements. Dividing the plurality of stacked sheets 6 into multiple groups along the axial direction, and in the same first cooling channel 4, the first cooling holes 7 of the stacked sheets 6 in the same group correspond axially, can reduce the flow resistance and flow noise of the coolant in the first cooling channel 4, and the same applies to the second cooling channel 5. At the same time, since the first cooling holes 7 of the stacked sheets 6 in the same group correspond axially and the second cooling holes 8 of the stacked sheets 6 in the same group correspond axially, during production and processing, the types of stacked sheets 6 required can be reduced, thereby greatly reducing the manufacturing cost of the stacked sheets 6.

[0043] Among them, as Figures 4 to 7 shown, the first cooling channel 4 and the second cooling channel 5 are straight channels, arc channels or folded-line channels along their extending directions. In this embodiment, both the first cooling channel 4 and the second cooling channel 5 are straight channels, and an inclination angle is formed between the extending direction of the straight channel and the axial direction of the stator body 1, and the inclination angle is greater than 0. As Figure 7 shown, in some embodiments, both the first cooling channel 4 and the second cooling channel 5 are arc channels. In other embodiments, both the first cooling channel 4 and the second cooling channel 5 are folded-line channels. In still other embodiments, the first cooling channel 4 is a straight channel and the second cooling channel 5 is a folded-line channel. The channel types and fitting forms of the first cooling channel 4 and the second cooling channel 5 can be adjusted according to actual usage needs.

[0044] It should be noted that the straight flow channel is the form presented by the first cooling flow channel 4 and the second cooling flow channel 5 on the overall stator body 1. That is, when the first cooling holes 7 on each laminated sheet move a certain distance along the radial or axial direction, a certain stepped step will be formed between each laminated sheet. However, on the overall stator body 1, the straight flow channel can be approximately regarded as a straight line.

[0045] In another embodiment, as Figures 3 to 5 shown, the stator body 1 includes a plurality of laminated sheets 6 stacked along the axial direction. Each laminated sheet 6 is provided with a first cooling hole 7 forming the first cooling flow channel 4 and a second cooling hole 8 forming the second cooling flow channel 5; in the same first cooling flow channel 4, the first cooling holes 7 of two adjacent laminated sheets 6 are offset and communicated in the circumferential and / or radial directions; in the same second cooling flow channel 5, the second cooling holes 7 of two adjacent laminated sheets 6 are offset and communicated in the circumferential and / or radial directions. The first cooling holes 7 of two adjacent laminated sheets 6 are offset and communicated in the circumferential and / or radial directions, which can, to a certain extent, extend the cooling path of the first cooling flow channel 4 and the contact area with the coolant, thereby facilitating the coolant to cool the stator body 1 and improving the cooling effect on the stator body 1. Similarly for the second cooling flow channel 5.

[0046] Among them, along the axial direction of the stator body 1, the part of the laminated sheet 6 that shields the first cooling hole 7 of the adjacent laminated sheet 6 is the shielding part, and the unshielded part of the first cooling hole 7 is the flow-through part. The projected area of the shielding part along the axial direction of the stator body 1 is less than or equal to the projected area of the flow-through part. This can ensure the smooth flow of the coolant in the stator body 1, enable the coolant with heat to quickly flow out of the stator body 1, and thus ensure the cooling effect on the stator body 1.

[0047] The present utility model also provides a motor, including the motor stator as described above.

[0048] In summary, by providing the first cooling flow channel 4 and the second cooling flow channel 5 on the stator body 1, and the first inner ring flow port 3 is closer to the geometric center of the first end face than the first outer ring flow port 2, and the second inner ring flow port 10 is closer to the geometric center of the second end face than the second outer ring flow port 9. Along the axial direction of the stator body 1, the first cooling flow channel 4 and the second cooling flow channel 5 are arranged to extend alternately along the radial direction of the stator body 1. While extending the cooling paths of the first cooling flow channel 4 and the second cooling flow channel 5 and the contact area between the stator body 1 and the coolant, through the cooperation relationship between the first cooling flow channel 4 and the second cooling flow channel 5, the heat dissipation and cooling effect on the stator body 1 can be further improved, and at the same time, the uniformity of heat dissipation can be improved.

[0049] The above embodiments are only illustrative of the principles and effects of the present utility model, and are not intended to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A motor stator, characterized in that: include: A stator body, wherein two ends of the stator body along the axial direction are respectively a first end face and a second end face; A first inner ring flow channel opening and a first outer ring flow channel opening are arranged on the first end surface, the first inner ring flow channel opening and the first outer ring flow channel opening are both distributed along the circumference of the stator body, and the first inner ring flow channel opening is closer to the geometric center of the first end surface than the first outer ring flow channel opening; A second inner ring flow channel opening and a second outer ring flow channel opening are provided on the second end surface; the second inner ring flow channel opening and the second outer ring flow channel opening are both distributed along the circumferential direction of the stator body, and the second inner ring flow channel opening is closer to the geometric center of the second end surface than the second outer ring flow channel opening; A first cooling channel, the first cooling channel extending in the axial direction and connecting the first inner ring channel opening and the corresponding second outer ring channel opening; The second cooling channel extends axially and communicates with the first outer ring channel opening and the corresponding second inner ring channel opening.

2. The motor stator according to claim 1, characterized in that: The projections of the first cooling channel and the second cooling channel in the circumferential direction of the stator body intersect with each other; and / or the projections of the first cooling channel and the second cooling channel in the radial direction of the stator body intersect with each other.

3. The motor stator according to claim 1, characterized in that: The first inner ring flow channel opening and the first outer ring flow channel opening are staggered or corresponded in the circumferential direction of the stator body, and the second inner ring flow channel opening and the second outer ring flow channel opening are staggered or corresponded in the circumferential direction of the stator body.

4. The motor stator according to claim 1, characterized in that: The first cooling channels and the second cooling channels are alternately arranged along the circumferential direction of the stator body.

5. The motor stator according to claim 1, characterized in that: The first cooling channel and the second cooling channel are straight channels, arc-shaped channels or zigzag channels along their extending directions.

6. The motor stator according to any one of claims 1 to 5, characterized in that: The flow direction of the cooling medium in the first cooling channel is opposite to that in the second cooling channel.

7. The motor stator according to any one of claims 1 to 4, characterized in that: The stator body includes a plurality of laminated sheets stacked in the axial direction, each of the laminated sheets is provided with a first cooling hole forming the first cooling channel and a second cooling hole forming the second cooling channel; the plurality of laminated sheets stacked in the axial direction are divided into a plurality of groups, each group includes a plurality of laminated sheets, in the same first cooling channel, the plurality of first cooling holes of the laminated sheets in the same group correspond to each other in the axial direction, and the first cooling holes of the same first cooling channel of two adjacent groups of laminated sheets are offset and connected in the circumferential direction and / or radial direction; in the same second cooling channel, the plurality of second cooling holes on the laminated sheets in the same group correspond to each other in the axial direction, and the second cooling holes of the laminated sheets in two adjacent groups are offset and connected in the circumferential direction and / or radial direction.

8. The motor stator according to any one of claims 1 to 4, characterized in that: The stator body includes a plurality of laminated sheets stacked in the axial direction, each of the laminated sheets is provided with a first cooling hole forming the first cooling channel and a second cooling hole forming the second cooling channel; in the same first cooling channel, the first cooling holes of two adjacent laminated sheets are offset and connected in the circumferential direction and / or radial direction; in the same second cooling channel, the second cooling holes of two adjacent laminated sheets are offset and connected in the circumferential direction and / or radial direction.

9. The motor stator according to claim 8, characterized in that: Along the axial direction of the stator body, the portion of the laminate that shields the first cooling hole or the second cooling hole of the adjacent laminate is a hole shielding portion, and the unshielded portion of the first cooling hole or the second cooling hole is a hole flow portion. At the first cooling hole or the second cooling hole, the projection area of ​​the hole shielding portion along the axial direction of the stator body is less than or equal to the projection area of ​​the hole flow portion.

10. A motor, characterized in that: The invention comprises a motor stator as claimed in any one of claims 1 to 9.

Images