Stator structure of motor and motor

Abstract

The utility model discloses a stator structure of a motor and the motor, the stator structure comprises a stator iron core, the stator iron core is annular, the inner circumferential wall of the stator iron core is provided with a stator groove used for installing a winding coil, the stator groove extends along the axial direction of the stator iron core, and the winding coil is arranged in the stator groove. An oil passing groove is formed in the peripheral wall of the stator core, a communicating oil channel is formed in the stator core, and the communicating oil channel communicates the oil passing groove with the stator groove. According to the stator structure provided by the embodiment of the invention, the stator core, the stator grooves, the oil passing grooves and the communicating oil channels are arranged, so that the stator structure of the motor not only can cool the stator core and the end windings, but also can perform direct contact cooling on the winding coils in the stator grooves during cooling, and the cooling effect of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to a stator structure of a motor and a motor with the stator structure. Background Art

[0002] In the related technology, as the development of automotive motors in recent years has increasingly required high power density, this requires the motor operating temperature to be maintained in a relatively low temperature range, so the cooling capacity of the motor is particularly important. Existing motor stators generally adopt core cooling plus end winding cooling, and the winding coil in the slot is one of the main heat sources of the motor. However, the existing motor stator cooling method cannot directly cool the winding coil in the stator slot of the motor stator, resulting in the generally poor cooling effect of the existing motors. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a stator structure that can not only cool the stator core and the end windings, but also directly contact cool the winding coils in the stator slots of the stator structure, so that the cooling effect of the motor is better.

[0004] The utility model also provides a motor using the stator structure.

[0005] According to the stator structure of the embodiment of the first aspect of the utility model, it includes: a stator core, the stator core is annular, the inner peripheral wall of the stator core is formed with stator slots for installing winding coils, the stator slots extend along the axial direction of the stator core, the outer peripheral wall of the stator core is formed with oil grooves, and a connecting oil channel is formed in the stator core, and the connecting oil channel connects the oil groove and the stator slots.

[0006] According to the stator structure of the embodiment of the present application, a stator core, a stator slot, an oil groove and a connecting oil channel are provided. The stator core is annular, the stator slot is provided on the inner peripheral wall of the stator core and is used to install the winding coil, the oil groove is provided on the outer peripheral wall of the stator core and is connected with the oil inlet on the motor housing, and the connecting oil channel is provided in the stator core and connects the oil groove and the stator slot. During the cooling process, the cooling medium enters the oil groove through the oil inlet on the motor housing and flows into the connecting oil channel in the stator core. Part of the cooling medium flows out through the connecting oil channel and is sprayed on the end winding of the stator core. At the same time, part of the cooling medium flows through the stator slot to cool the winding coil installed in the stator slot, so that the stator structure of the motor can not only cool the stator core and the end winding during cooling, but also can directly contact and cool the winding coil in the stator slot, which is beneficial to improving the cooling effect of the motor and improving the working efficiency of the motor.

[0007] According to some embodiments of the present utility model, the connecting oil channel has a first sub-oil channel and a second sub-oil channel. Along the axial direction of the stator core, the first sub-oil channel and the second sub-oil channel are respectively located on both sides of the oil passage groove, and the first sub-oil channel and the second sub-oil channel are both connected to the oil passage groove and the stator slot.

[0008] According to some embodiments of the present utility model, the end of the first sub-oil channel toward the oil channel is connected to the oil channel, and the end of the first sub-oil channel away from the oil channel is connected to the stator slot; the end of the second sub-oil channel toward the oil channel is connected to the oil channel, and the end of the second sub-oil channel away from the oil channel is connected to the stator slot.

[0009] According to some embodiments of the utility model, there are multiple stator slots and multiple connecting oil channels, and the multiple stator slots and multiple connecting oil channels are arranged in sequence along the circumference of the stator core, and the multiple stator slots and multiple connecting oil channels are connected one by one; the oil passage groove is annular, and the oil passage groove extends along the circumference of the stator core and is connected to the multiple connecting oil channels.

[0010] According to some embodiments of the present invention, the stator core includes a plurality of core laminations, which are stacked along the axial direction of the stator core, and the plurality of core laminations form a middle core lamination group and two end core lamination groups, the middle core lamination group is located between the two end core lamination groups, the middle core lamination group and the two end core lamination groups jointly define the oil groove, and the two end core lamination groups are both formed with the connecting oil channel.

[0011] According to some embodiments of the present invention, the outer diameter of the middle core lamination group is smaller than the outer diameters of the two end core lamination groups to define the oil groove.

[0012] According to some embodiments of the present invention, at least one of the end core lamination groups includes a plurality of core laminations, each of the core laminations has an oil guide hole, and the oil guide holes of the plurality of core laminations of the end core lamination group are connected to form a portion of the connecting oil channel.

[0013] According to some embodiments of the present utility model, along the axial direction of the stator core, the orthographic projections of the corresponding two oil guide holes of two adjacent core laminations partially overlap.

[0014] According to some embodiments of the present invention, the spacing distance between the oil guide hole and the center line of the corresponding core lamination gradually decreases from the middle core lamination group to the end core lamination group.

[0015] The motor according to the second embodiment of the utility model includes: the stator structure described in the above embodiment.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a schematic diagram of a stator core at an angle according to an embodiment of the present application;

[0019] Figure 2 is a schematic diagram of a stator structure according to an embodiment of the present application at an angle;

[0020] Figure 3 is a cross-sectional view of a motor according to an embodiment of the present application;

[0021] Figure 4 yes Figure 3 A partial enlarged schematic diagram of the middle A area;

[0022] Figure 5 is an exploded schematic diagram of a core lamination stack according to an embodiment of the present application;

[0023] Figure 6 is a schematic diagram of oil injection cooling of stator core end windings according to an embodiment of the present application;

[0024] Figure 7 yes Figure 6 A partial enlarged schematic diagram of the middle B area;

[0025] Figure 8 is a front view of a first core lamination according to an embodiment of the present application;

[0026] Fig. 9 yes Figure 8 A partial enlarged schematic diagram of the middle C area;

[0027] Fig.10 is a front view of a second core lamination according to an embodiment of the present application;

[0028] Fig.11 is a front view of a third core lamination according to an embodiment of the present application;

[0029] Fig.12 is a front view of a fourth core lamination according to an embodiment of the present application;

[0030] Fig.13is a front view of a fifth core lamination according to an embodiment of the present application.

[0031] Reference numerals:

[0032] Stator structure 1, oil inlet 2, motor 3,

[0033] Stator core 10,

[0034] Stator slot 20,

[0035] Oil tank 30,

[0036] The connecting oil passage 40, the first sub-oil passage 41, the second sub-oil passage 42,

[0037] End winding 50,

[0038] Core lamination 60, oil guide hole 61,

[0039] The middle core lamination group 11, the fifth core lamination 111,

[0040] The end core lamination group 12 includes a first core lamination 121, a second core lamination 122, a third core lamination 123, and a fourth core lamination 124.

[0041] Winding coil 70. DETAILED DESCRIPTION

[0042] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] Reference below Figure 1-Figure 13 A stator structure 1 according to an embodiment of the present invention is described, and the stator structure 1 is installed on a motor 3 .

[0044] According to the stator structure 1 of the embodiment of the first aspect of the utility model, it includes: a stator core 10, the stator core 10 is annular, the inner peripheral wall of the stator core 10 is formed with a stator slot 20 for installing a winding coil 70, the stator slot 20 extends along the axial direction of the stator core 10, the outer peripheral wall of the stator core 10 is formed with an oil groove 30, and a connecting oil channel 40 is formed in the stator core 10, and the connecting oil channel 40 connects the oil groove 30 and the stator slot 20.

[0045] It should be noted that in the prior art, the cooling oil circuit design of the motor stator structure is away from the winding coils in the stator slots of the stator core. The cooling medium can act on the stator core and the end windings of the motor, but cannot directly act on the winding coils in the stator slots to cool them. However, the winding coils in the stator slots are one of the main heat sources of the motor. The inability to accurately cool the winding coils in the stator slots makes the cooling effect of the motor stator structure generally poor, affecting the working efficiency of the motor.

[0046] Based on this, the embodiment of the present application proposes a stator structure 1, which is provided with a stator core 10, a stator slot 20, an oil groove 30 and a connecting oil passage 40, such as Figure 1 As shown, the stator core 10 is an annular structure, and the inner circumferential wall of the stator core 10 is provided with a plurality of stator slots 20, each of which extends along the axial direction of the stator core 10, and the plurality of stator slots 20 can be evenly distributed and spaced apart from each other along the circumferential direction of the stator core 10, and the spacing distance between two adjacent stator slots 20 is equal. Figure 1 When placed in the middle direction, the axial direction of the stator core 10 is Figure 1 In the X direction, the stator slot 20 is used to install the winding coil 70, the oil groove 30 is arranged on the outer peripheral wall of the stator core 10, the oil groove 30 can be an annular structure extending along the circumferential direction of the stator core 10, and the connecting oil channel 40 is arranged in the stator core 10 and connects the oil groove 30 and the stator slot 20.

[0047] In the embodiments of the present application, Figure 3 and Figure 4 As shown, an oil inlet 2 is provided on the motor housing for inputting cooling medium into the stator structure 1. The oil groove 30 is connected with the oil inlet 2 on the motor housing. During the cooling process, the cooling medium enters the oil groove 30 through the oil inlet 2 and then flows into the connecting oil channel 40 in the stator core 10. Part of the cooling medium flows out through the connecting oil channel 40 and sprays on the end winding 50 of the stator core 10 (as shown in FIG. Figure 6 As shown), part of the cooling medium flows through the stator slot 20 to cool the winding coil 70 installed in the stator slot 20, so that the stator structure 1 of the motor 3 can not only cool the stator core 10 and the end winding 50 during cooling, but also directly contact cool the winding coil 70 in the stator slot 20, so that the cooling effect of the motor 3 is better and the working efficiency of the motor 3 is improved.

[0048] It should be noted that the cooling medium involved in the embodiments of the present application is generally cooling oil. The advantage of using oil cooling is that the cooling oil can directly contact the heating parts of the motor 3, and the stator structure 1 of the motor 3 is immersed in the cooling oil for cooling. The heat dissipation effect is relatively good, and the oil medium has the characteristics of good thermal conductivity, good insulation, low freezing point, high boiling point, etc., which makes the cooling effect of the motor 3 better.

[0049] In some embodiments of the utility model, the connecting oil channel 40 may have a first sub-oil channel 41 and a second sub-oil channel 42. Along the axial direction of the stator core 10, the first sub-oil channel 41 and the second sub-oil channel 42 are respectively located on both sides of the oil groove 30, and the first sub-oil channel 41 and the second sub-oil channel 42 are both connected to the oil groove 30 and the stator groove 20.

[0050] like Figure 3 and Figure 4 As shown, the connecting oil passage 40 can extend along the axial direction of the stator core 10 and be arranged inside the stator core 10. The connecting oil passage 40 is divided into a first sub-oil passage 41 and a second sub-oil passage 42 along the axial direction of the stator core 10. The first sub-oil passage 41 and the second sub-oil passage 42 are respectively located on both sides of the oil groove 30. The first sub-oil passage 41 and the second sub-oil passage 42 are both connected to the oil groove 30 and the stator groove 20. One end of the first sub-oil passage 41 is connected to the oil groove 30, and the other end is connected to the stator groove 20. Similarly, one end of the second sub-oil passage 42 is connected to the oil groove 30, and the other end is connected to the stator groove 20. During the cooling process, after the cooling medium flows through the oil groove 30, the first sub-oil channel 41 and the second sub-oil channel 42 play a role of diversion, guiding the cooling medium to the two sides of the oil groove 30 respectively, and flowing to the stator slot 20 and the end winding 50 of the stator structure 1 through the first sub-oil channel 41 and the second sub-oil channel 42, thereby achieving simultaneous cooling of the winding coil 70 in the stator slot 20 of the stator structure 1 and the end winding 50, and being able to more efficiently transmit the cooling medium, so that the cooling efficiency of the motor 3 is higher and the cooling effect is better.

[0051] In some embodiments of the present invention, the end of the first sub-oil channel 41 toward the oil groove 30 is connected to the oil groove 30, and the end of the first sub-oil channel 41 away from the oil groove 30 is connected to the stator groove 20; the end of the second sub-oil channel 42 toward the oil groove 30 is connected to the oil groove 30, and the end of the second sub-oil channel 42 away from the oil groove 30 is connected to the stator groove 20.

[0052] like Figure 3 and Figure 4As shown, the first sub-oil passage 41 and the second sub-oil passage 42 are distributed on both sides of the oil groove 30 and are separated from each other. The first sub-oil passage 41 passes through the oil groove 30 and the stator slot 20. Along the axial direction of the stator core 10, the end of the first sub-oil passage 41 facing the oil groove 30 is connected to the oil groove 30, and the end of the first sub-oil passage 41 away from the oil groove 30 is connected to the stator slot 20. Similarly, the second sub-oil passage 42 passes through the oil groove 30 and the stator slot 20. Along the axial direction of the stator core 10, the end of the second sub-oil passage 42 facing the oil groove 30 is connected to the oil groove 30, and the end of the second sub-oil passage 42 away from the oil groove 30 is connected to the stator slot 20. The cooling medium can enter the stator core 10 only through the first sub-oil channel 41, or the cooling medium can enter the stator core 10 only through the second sub-oil channel 42, or the cooling medium can enter the stator core 10 through both the first sub-oil channel 41 and the second sub-oil channel 42. The embodiment of the present application is described by taking the cooling medium passing through the first sub-oil channel 41 and the second sub-oil channel 42 at the same time as an example.

[0053] During the cooling process, the cooling medium flows into the first sub-oil channel 41 and the second sub-oil channel 42 from the ends of the first sub-oil channel 41 and the second sub-oil channel 42 close to the oil groove 30, and flows in the first sub-oil channel 41 and the second sub-oil channel 42 in the direction away from the ends of the oil groove 30. After flowing out of the first sub-oil channel 41 and the second sub-oil channel 42, part of the cooling medium enters the stator slot 20 to cool the winding coil 70 arranged in the stator slot 20. At the same time, part of the cooling medium is sprayed on the end winding 50 of the stator core 10 to cool it. At the same time, the cooling medium flows to the stator slot 20 through the first sub-oil channel 41 and the second sub-oil channel 42 to cool the winding coil 70 in the stator slot 20 and the end winding 50, so that the cooling time is shorter, the cooling efficiency of the motor 3 is higher, and the cooling effect is better.

[0054] In some embodiments of the present invention, there are multiple stator slots 20 and multiple connecting oil channels 40, and the multiple stator slots 20 and the multiple connecting oil channels 40 are arranged in sequence along the circumference of the stator core 10, and the multiple stator slots 20 and the multiple connecting oil channels 40 are connected one by one; the oil groove 30 is annular, and the oil groove 30 extends along the circumference of the stator core 10 and is connected to the multiple connecting oil channels 40.

[0055] like Figure 1As shown, there are multiple stator slots 20 and multiple connecting oil passages 40. In the embodiment of the present application, the number of stator slots 20 and the connecting oil passages 40 is the same. The multiple stator slots 20 and the multiple connecting oil passages 40 can be evenly distributed along the circumference of the stator core 10 at equal intervals. The stator slots 20 and the connecting oil passages 40 correspond to each other in the radial direction of the stator core 10. The stator slots 20 are connected to the corresponding connecting oil passages 40, so that the multiple stator slots 20 and the multiple connecting oil passages 40 are connected in a one-to-one correspondence. The multiple connecting oil passages 40 are evenly distributed in the circumference of the stator core 10 and are connected to the multiple stator slots 20 in a one-to-one correspondence. During the cooling process, the cooling medium can flow into the multiple stator slots 20 evenly through the multiple connecting oil passages 40 at the same time, so as to realize the simultaneous cooling of the winding coils 70 in the multiple stator slots 20 in the circumference of the stator core 10, so that the cooling efficiency is higher, the cooling effect is better, and it is more stable.

[0056] like Figure 2 As shown, the oil groove 30 is an annular structure extending along the circumference of the stator core 10. The oil groove 30 is arranged on the outer peripheral wall of the stator core 10. A plurality of connecting oil passages 40 are arranged in the stator core 10. The plurality of connecting oil passages 40 are evenly distributed along the circumference of the stator core 10, so that the cooling medium flows from the oil groove 30 to the connecting oil passages 40, and the cooling of the winding coil 70 in the stator slot 20 inside the stator core 10 and the end winding 50 of the stator core 10 by the cooling medium is completed, which is beneficial to improving the cooling effect of the motor 3.

[0057] In some embodiments of the present invention, the stator core 10 may include a plurality of core laminations 60, which are stacked along the axial direction of the stator core 10, and the plurality of core laminations 60 form a middle core lamination group 11 and two end core lamination groups 12, the middle core lamination group 11 is located between the two end core lamination groups 12, the middle core lamination group 11 and the two end core lamination groups 12 jointly define an oil groove 30, and the two end core lamination groups 12 are both formed with a connecting oil channel 40.

[0058] The stator core 10 may include a plurality of core laminations 60, which are stacked along the axial direction of the stator core 10 to form the stator core 10, and the plurality of core laminations 60 form a middle core lamination group 11 and two end core lamination groups 12. The middle core lamination group 11 includes at least one core lamination 60, and the end core lamination group 12 includes at least one core lamination 60. The middle core lamination group 11 is located between the two end core lamination groups 12. The present application is described by taking the two end core lamination groups 12 including the same number of core laminations 60 as an example, and the core laminations 60 of the two end core lamination groups 12 are symmetrical about the middle core lamination group 11.

[0059] In the embodiments of the present application, Figure 5As shown, the present application is explained by taking the two end core lamination groups 12 each including 4 core laminations 60 and the middle core lamination group 11 including 1 core lamination 60 as an example, the multiple core laminations 60 of each end core lamination group 12 are stacked along the axial direction of the stator core 10, and the multiple core laminations 60 of each end core lamination group 12 include a first core lamination 121, a second core lamination 122, a third core lamination 123, and a fourth core lamination 124. From the end core lamination group 12 to the middle core lamination group 11, they are sequentially marked as the first core lamination 121, the second core lamination 122, the third core lamination 123, and the fourth core lamination 124. The middle core lamination group 11 includes a core lamination 60, marked as the fifth core lamination 111. The two end core lamination groups 12 have the same structure and are symmetrically arranged on both sides of the middle core lamination group 11. The first core lamination 121 has a structure as shown in FIG. Figure 8 As shown, the structure of the second core lamination 122 is as follows Fig.10 As shown, the structure of the third core lamination 123 is as follows Fig.11 As shown, the structure of the fourth core lamination 124 is as follows Fig.12 As shown, the structure of the fifth core lamination 111 is as shown in Fig.13 Each core lamination 60 is provided with the same number of stator slots, and the multiple stator slots on the multiple core laminations 60 are connected one by one. After the multiple core laminations 60 are stacked, the multiple stator slots corresponding to the multiple core laminations 60 constitute the stator slots 20.

[0060] The middle core lamination group 11 and the two end core lamination groups 12 jointly define an oil groove 30. Figure 7 As shown, the outer peripheral wall of the middle core lamination group 11 and the side walls of the core laminations 60 adjacent to the middle core lamination group 11 in the two end core lamination groups 12 jointly construct an annular oil groove 30. Specifically, in the embodiment of the present application, the fifth core lamination 111 and the two fourth core laminations 124 jointly define the oil groove 30, and the oil groove 30 is connected to the oil inlet 2 provided on the motor housing. The oil groove 30 is connected to the connecting oil channel 40 in the stator core 10. The cooling medium enters the oil groove 30 through the oil inlet 2 and then flows into the connecting oil channel 40, thereby further cooling the stator structure 1.

[0061] Both end core lamination groups 12 can form a connecting oil passage 40, for example, one end core lamination group 12 forms a first sub-oil passage 41, and the other end core lamination group 12 forms a second sub-oil passage 42. Figure 6As shown, during the cooling process, the cooling medium enters the oil groove 30 and then flows into the connecting oil channel 40 in the stator core 10. Part of the cooling medium flows out through the connecting oil channel 40 and sprays on the end winding 50 of the stator core 10. At the same time, part of the cooling medium flows into the stator slot 20 to cool the winding coil 70 installed in the stator slot 20. When cooling, the stator structure 1 of the motor 3 can not only cool the stator core 10 and the end winding 50, but also directly contact cool the winding coil 70 in the stator slot 20, which is beneficial to improving the cooling effect of the motor 3.

[0062] In some embodiments of the present invention, Figure 7-Figure 13 As shown, the outer diameter of the middle core lamination stack 11 is smaller than the outer diameters of the two end core lamination stacks 12 to define the oil groove 30 .

[0063] like Figure 7 As shown, the outer diameter of the middle core lamination group 11 is smaller than the outer diameters of the two end core lamination groups 12, the middle core lamination group 11 is located between the two end core lamination groups 12, and the middle core lamination group 11 and the two end core lamination groups 12 jointly define an oil groove 30. Specifically, as Figure 6 and Figure 7 As shown, in the embodiment of the present application, the two fourth core laminations 124 and the fifth core laminations 111 jointly define an oil groove 30, such as Figure 8-Figure 13 As shown, the outer diameters of the first core lamination 121, the second core lamination 122, the third core lamination 123, and the fourth core lamination 124 are the same, and the outer diameter of the fifth core lamination 111 is smaller than the outer diameters of the other core laminations 60. Since the outer diameter of the fifth core lamination 111 is small, an annular oil groove 30 is formed on the outer peripheral wall of the stator core 10, and the oil groove 30 is connected to the oil inlet 2 provided on the motor housing, and the oil groove 30 is connected to the connecting oil channel 40 in the stator core 10, and the cooling After the medium enters the stator structure 1 from the oil inlet 2, it further flows into the connecting oil channel 40 through the oil groove 30. Part of the cooling medium flows out from the connecting oil channel 40 and sprays on the end winding 50 of the stator core 10, and part of the cooling medium enters the stator slot 20 to perform direct contact cooling on the winding coil 70 in the stator slot 20, thereby achieving synchronous cooling of the end winding 50 of the stator core 10 and the winding coil 70 in the stator slot 20, thereby improving the cooling efficiency of the motor 3 and the cooling effect of the motor 3.

[0064] In some embodiments of the present invention, at least one end core lamination group 12 includes a plurality of core laminations 60, each core lamination 60 has an oil guide hole 61, and the oil guide holes 61 of the plurality of core laminations 60 of the end core lamination group 12 are connected to form a portion of the connecting oil passage 40.

[0065] One end core lamination group 12 includes a plurality of core laminations 60, or both end core lamination groups 12 include a plurality of core laminations 60. This application is described by taking both end core lamination groups 12 as an example including a plurality of core laminations 60. The plurality of core laminations 60 each have an oil guide hole 61, and the oil guide holes 61 of the plurality of core laminations 60 of the end core lamination group 12 are connected to form a portion of the oil passage 40, for example: the oil guide holes 61 of the plurality of core laminations 60 of one end core lamination group 12 are connected to form a first sub-oil passage 41, and the oil guide holes 61 of the plurality of core laminations 60 of the other end core lamination group 12 are connected to form a second sub-oil passage 42.

[0066] like Figure 8 to Figure 13 As shown, each core lamination 60 of the end core lamination group 12 has an oil guide hole 61, and the size of each oil guide hole 61 can be the same. The oil guide hole 61 on the first core lamination 121 is connected to the stator slot 20, and the oil guide holes 61 on the second core lamination 122, the third core lamination 123, and the fourth core lamination 124 are radially spaced from the stator slot 20. The radial distances between the oil guide holes 61 on the second core lamination 122, the third core lamination 123, and the fourth core lamination 124 and the stator slot 20 increase sequentially, and the radial distances can be set to D2, D3, and D4, respectively, satisfying the relationship: D2<D3<D4. The oil guide holes 61 on the fourth core lamination 124 , the oil guide holes 61 on the third core lamination 123 , the oil guide holes 61 on the second core lamination 122 , and the oil guide holes 61 on the first core lamination 121 are connected in the axial direction of the stator core 10 to form a connecting oil passage 40 .

[0067] During the cooling process, when the cooling medium flows from the oil groove 30 into the connecting oil passage 40 formed by the oil guide holes 61 on the fourth core lamination 124, the oil guide holes 61 on the third core lamination 123, the oil guide holes 61 on the second core lamination 122, and the oil guide holes 61 on the first core lamination 121, part of the cooling medium enters the stator slot 20 due to the oil guide holes 61 on the first core lamination 121 being connected with the stator slot 20, and directly contacts and cools the winding coil 70 in the stator slot 20, and part of the cooling medium flows out from the connecting oil passage 40 and sprays on the end winding 50 of the stator core 10, thereby achieving synchronous cooling of the end winding 50 of the stator core 10 and the winding coil 70 in the stator slot 20, thereby improving the cooling efficiency of the motor 3 and the cooling effect of the motor 3.

[0068] In some embodiments of the present invention, Figure 4 As shown, along the axial direction of the stator core 10, the orthographic projections of the corresponding two oil guide holes 61 of two adjacent core laminations 60 partially overlap.

[0069] like Figure 3 and Figure 4As shown, for the end core lamination group 12, the oil guide holes 61 of two adjacent core laminations 60 are not completely corresponding and connected along the axial direction of the stator core 10, and are partially staggered along the radial direction of the stator core 10. Along the axial direction of the stator core 10, the orthographic projections of the oil guide holes 61 of the fourth core lamination 124 and the oil guide holes 61 of the third core lamination 123 along the axial direction of the stator core 10 have an overlapping area, and the oil guide holes 61 of the third core lamination 123 and the second core lamination 124 are not completely corresponding and connected. The oil guide holes 61 of the lamination 122 have an overlapping area along the orthographic projection in the axial direction of the stator core 10, and the oil guide holes 61 of the second core lamination 122 and the oil guide holes 61 of the first core lamination 121 have an overlapping area along the orthographic projection of the stator core 10. The overlapping area is a connecting area of ​​the oil guide holes 61 of adjacent core laminations 60, and at least parts of the corresponding two oil guide holes 61 of two adjacent core laminations 60 are interconnected to form a connecting oil passage 40, thereby realizing the arrangement of the connecting oil passage 40.

[0070] In some embodiments of the present invention, the spacing distance between the oil guide hole 61 and the center line of the corresponding core lamination 60 gradually decreases from the middle core lamination group 11 to the end core lamination group 12 .

[0071] like Figure 4 , Figure 6 and Figure 7 As shown, the first core lamination 121, the second core lamination 122, the third core lamination 123, and the fourth core lamination 124 have the same outer diameter size, and the outer diameter size of the fifth core lamination 111 is smaller than the outer diameter size of the other core laminations 60, such as Figure 3 and Figure 7 As shown, the fifth core lamination 111 has no oil guide hole 61 , and the oil guide hole 61 of the fourth core lamination 124 can be connected to the annular oil groove 30 , thereby ensuring that the oil groove 30 and the plurality of connecting oil passages 40 are connected to each other in the circumferential direction of the stator core 10 .

[0072] like Figure 4 As shown, for the end core lamination group 12, the spacing distance between the oil guide hole 61 and the center line of the corresponding core lamination 60 gradually decreases from the middle core lamination group 11 to the end core lamination group 12. For example, the spacing distance between the oil guide hole 61 of the fourth core lamination 124 and the center line of the fourth core lamination 124 is greater than the spacing distance between the oil guide hole 61 of the third core lamination 123 and the center line of the third core lamination 123. The spacing distance between the oil guide hole 61 of the third core lamination 123 and the center line of the third core lamination 123 is greater than the spacing distance between the oil guide hole 61 of the second core lamination 122 and the center line of the second core lamination 122. The spacing distance between the oil guide hole 61 of the second core lamination 122 and the center line of the second core lamination 122 is greater than the spacing distance between the oil guide hole 61 of the first core lamination 121 and the center line of the first core lamination 121. Figure 3 and Figure 4 As shown, from the middle core lamination group 11 to the end core lamination group 12, the spacing distance between the connecting oil channel 40 and the center line of the stator core 10 gradually decreases, so that when the cooling medium flows in the connecting oil channel 40, the flow can be accelerated by the gravitational potential energy, which is beneficial to the flow of the cooling medium in the connecting oil channel 40, thereby increasing the flow rate of the cooling medium and improving the cooling efficiency of the motor 3.

[0073] The motor 3 according to the second aspect of the present utility model comprises: the stator structure 1 in the above embodiment.

[0074] According to the motor 3 of the embodiment of the present application, the stator structure 1 of the above embodiment is adopted, so that the stator structure 1 of the motor 3 can not only cool the stator core 10 and the end winding 50 during cooling, but also directly contact cool the winding coil 70 in the stator slot 20, which is beneficial to improving the cooling effect of the motor 3 and achieving a better cooling effect of the motor 3.

[0075] The stator structure 1 and other components of the motor 3 such as the rotor structure and the operation according to the embodiment of the utility model are well known to those skilled in the art and will not be described in detail here.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0077] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stator structure (1) of a motor (3), characterized in that: include: A stator core (10), wherein the stator core (10) is annular, and the inner peripheral wall of the stator core (10) is formed with stator slots (20) for mounting winding coils (70), and the stator slots (20) extend along the axial direction of the stator core (10), and the outer peripheral wall of the stator core (10) is formed with oil grooves (30), and a connecting oil passage (40) is formed in the stator core (10), and the connecting oil passage (40) connects the oil groove (30) and the stator slots (20).

2. The stator structure (1) of the motor (3) according to claim 1, characterized in that: The connecting oil passage (40) comprises a first sub-oil passage (41) and a second sub-oil passage (42). Along the axial direction of the stator core (10), the first sub-oil passage (41) and the second sub-oil passage (42) are respectively located on both sides of the oil passage groove (30). The first sub-oil passage (41) and the second sub-oil passage (42) are both connected to the oil passage groove (30) and the stator groove (20).

3. The stator structure (1) of the motor (3) according to claim 2, characterized in that: The end of the first sub-oil passage (41) facing the oil passage groove (30) is communicated with the oil passage groove (30), and the end of the first sub-oil passage (41) facing away from the oil passage groove (30) is communicated with the stator groove (20); The end of the second sub-oil passage (42) facing the oil passage groove (30) is communicated with the oil passage groove (30), and the end of the second sub-oil passage (42) facing away from the oil passage groove (30) is communicated with the stator groove (20).

4. The stator structure (1) of the motor (3) according to claim 1, characterized in that: The stator slots (20) and the connecting oil passages (40) are both multiple, and the multiple stator slots (20) and the multiple connecting oil passages (40) are arranged in sequence along the circumference of the stator core (10), and the multiple stator slots (20) and the multiple connecting oil passages (40) are connected in a one-to-one correspondence; the oil passage groove (30) is annular, and the oil passage groove (30) extends along the circumference of the stator core (10) and is connected to the multiple connecting oil passages (40).

5. The stator structure (1) of the motor (3) according to any one of claims 1 to 4, characterized in that: The stator core (10) comprises a plurality of core laminations (60), the plurality of core laminations (60) being stacked in an axial direction of the stator core (10), the plurality of core laminations (60) forming a middle core lamination group (11) and two end core lamination groups (12), the middle core lamination group (11) being located between the two end core lamination groups (12), the middle core lamination group (11) and the two end core lamination groups (12) jointly defining the oil passage groove (30), and the two end core lamination groups (12) both forming the connecting oil passage (40).

6. The stator structure (1) of the motor (3) according to claim 5, characterized in that: The outer diameter of the middle core lamination group (11) is smaller than the outer diameters of the two end core lamination groups (12) to define the oil passage groove (30).

7. The stator structure (1) of the motor (3) according to claim 5, characterized in that: At least one of the end core lamination groups (12) comprises a plurality of core laminations (60), each of the core laminations (60) having an oil guide hole (61), and the oil guide holes (61) of the plurality of core laminations (60) of the end core lamination group (12) are connected to form a portion of the connecting oil passage (40).

8. The stator structure (1) of the electric machine (3) according to claim 7, characterized in that: Along the axial direction of the stator core (10), the orthographic projections of the corresponding two oil guide holes (61) of two adjacent core laminations (60) partially overlap.

9. The stator structure (1) of the electric machine (3) according to claim 8, characterized in that: From the middle core lamination group to the end core lamination group, the spacing distance between the oil guide hole (61) and the center line of the corresponding core lamination (60) gradually decreases.

10. A motor (3), characterized in that: A stator structure (1) comprising an electric machine (3) according to any one of claims 1-9.

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