Stator core, stator assembly, motor and vehicle

Abstract

The utility model relates to a stator core, a stator assembly, a motor and a vehicle, the stator core comprises an accommodating groove and an iron core oil duct, and the accommodating groove is suitable for accommodating a stator winding. The iron core oil channel comprises a first iron core oil channel and a second iron core oil channel, the oil outlet end of the first iron core oil channel is communicated with the containing groove so that the iron core oil channel can supply cooling oil to the containing groove, and the oil outlet end of the second iron core oil channel extends to the end of the stator iron core so as to be used for cooling an end winding, located outside the containing groove, of the stator winding. Cooling oil flowing in from the oil inlet end of the iron core oil channel flows to the containing groove and the end winding through the first iron core oil channel and the second iron core oil channel respectively, so that the cooling oil is provided for different parts of the stator winding at the same time, the cooling efficiency of the stator winding is improved, cooling of the stator winding is more uniform, and the service life of the stator winding is prolonged. And the cooling effect and the service life of the stator winding are further improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of drive motors, and in particular, to a stator core, a stator assembly, a motor and a vehicle. Background Art

[0002] With the continuous development of new energy vehicles and the gradual increase in market demand for the driving capabilities of new energy vehicles, the drive motors of new energy vehicles need to continuously improve their speed, torque density and power density while gradually compressing their volume. The higher the speed, torque density and power density of the drive motor, the higher the heat it generates. Therefore, the heat dissipation and cooling structure of the drive motor is essential for the reliable, stable and efficient operation of the motor.

[0003] Motor cooling can be divided into air cooling, water cooling and oil cooling. Very few low-performance motors use economical air cooling; traditional motor cooling mostly uses water cooling. Since the water cooling solution is indirect cooling, the cooling water cannot directly contact the heat dissipation parts, which has certain defects; the oil cooling solution has become the first choice for high-performance motor cooling solutions due to its natural electrical insulation and high degree of freedom in structural design.

[0004] When the motor is working, the stator winding generates heat, and it needs to be effectively cooled and cooled. In the related art, the stator winding is accommodated in the axial channel of the stator core, and the stator winding is cooled when the cooling medium flows along the axial channel. However, in this cooling solution, the cooling medium cools the stator winding unevenly, and the cooling effect is poor. Utility Model Content

[0005] The purpose of the present disclosure is to provide a stator core, a stator assembly, a motor and a vehicle to solve the above technical problems.

[0006] In order to achieve the above-mentioned object, as a first aspect of the present disclosure, the present disclosure provides a stator core, comprising:

[0007] A receiving slot, adapted to receive a stator winding; and

[0008] The core oil channel includes a first core oil channel and a second core oil channel. The oil outlet end of the first core oil channel is connected to the receiving groove so that the core oil channel can supply cooling oil to the receiving groove. The oil outlet end of the second core oil channel extends to the end of the stator core to cool the end winding of the stator winding located outside the receiving groove.

[0009] Optionally, the second core oil passage is configured as a first oil hole, one end of the first oil hole extending to the end of the stator core;

[0010] The oil inlet end of the first core oil passage extends to the inner peripheral wall of the first oil hole.

[0011] Optionally, the first core oil passage includes a first connecting oil passage and a second connecting oil passage;

[0012] The first connecting oil channel extends in the radial direction of the stator core, and is staggered with the corresponding accommodating groove in the circumferential direction of the stator core. One end of the first connecting oil channel is connected to the first oil hole, and the other end of the first connecting oil channel is connected to the first end of the second connecting oil channel, and the second end of the second connecting oil channel is connected to the accommodating groove.

[0013] Optionally, in the radial direction of the stator core, a position where the second connecting oil passage is connected to the accommodating groove is closer to the inner end of the accommodating groove than to the outer end of the accommodating groove.

[0014] Optionally, the second connecting oil channel is arranged obliquely, and the first end of the second connecting oil channel is located outside the second end.

[0015] Optionally, the second core oil passage includes a third connecting oil passage;

[0016] The third connecting oil channel extends in the radial direction of the stator core, and the third connecting oil channel is aligned with the corresponding receiving groove in the circumferential direction of the stator core. One end of the third connecting oil channel is connected to the first oil hole, and the other end of the third connecting oil channel is connected to the corresponding receiving groove.

[0017] Optionally, the core oil channel further includes an oil inlet groove, which is arranged on the outer peripheral wall of the stator core around the circumference of the stator core, and the first oil hole is arranged on at least one side wall of the oil inlet groove in the axial direction of the stator core.

[0018] Optionally, the oil inlet groove is located in the middle of the stator core in the axial direction, and the first oil holes are provided on both side walls of the oil inlet groove in the axial direction of the stator core.

[0019] Optionally, the oil inlet groove is an annular groove, the number of the accommodating grooves is multiple, and the multiple accommodating grooves are arranged at intervals around the circumference of the stator core;

[0020] The number of the first oil holes and the number of the second core oil passages are both multiple, and the multiple first oil holes are arranged at intervals around the circumference of the stator core;

[0021] The number of the first oil holes is the same as the number of the accommodating grooves, and each of the first oil holes is connected to the corresponding accommodating groove through the corresponding second core oil passage.

[0022] Optionally, a second oil hole is provided on at least one side wall of the oil inlet groove in the axial direction of the stator core;

[0023] The second oil hole extends along the axial direction of the stator core, and one end of the second oil hole away from the oil inlet groove extends to the end of the stator core.

[0024] Optionally, the number of the first oil holes and the number of the second oil holes are both plural, and on the same side wall, the second oil holes and the first oil holes are arranged at equal intervals around the circumference of the stator core.

[0025] As a second aspect of the present disclosure, the present disclosure provides a stator assembly, including a stator winding and the above-mentioned stator core.

[0026] The stator winding includes a first winding portion and a second winding portion, wherein the first winding portion is accommodated in the accommodation slot, the second winding portion extends out of the accommodation slot in the axial direction of the stator winding, and the second winding portion is configured as the end winding.

[0027] Optionally, the stator assembly further includes two oil rings, which are respectively arranged at both ends of the stator core, and the oil rings are used to be sleeved on the outside of the second winding part. The oil rings are provided with oil injection holes, and the oil injection holes are suitable for connecting with the oil inlet on the motor casing.

[0028] As a third aspect of the present disclosure, the present disclosure provides an electric motor, comprising the above-mentioned stator assembly.

[0029] Optionally, the motor further comprises a housing, a cavity is provided inside the housing, and the stator assembly is arranged in the cavity;

[0030] An oil inlet is arranged on the outer peripheral wall of the shell, and the oil inlet is communicated with the containing groove through the iron core oil passage.

[0031] Optionally, the oil inlet is located in the middle of the housing in the axial direction, so that in the axial direction of the stator core, the position of the oil inlet can be aligned with the position of the oil inlet end of the core oil channel on the stator core.

[0032] Optionally, the stator assembly further comprises two oil rings, the two oil rings are respectively arranged at two ends of the stator core, the oil rings are used to be sleeved on the outside of the second winding part, and the oil rings are provided with oil injection holes, and the oil injection holes are suitable for communicating with the oil inlet on the housing of the motor;

[0033] At least two seals are provided between the outer circumferential wall of the oil ring and the inner circumferential wall of the housing. The two seals are spaced apart along the axial direction of the stator core. In the axial direction of the stator core, the oil injection hole is located between the two seals.

[0034] As a fourth aspect of the present disclosure, the present disclosure provides a vehicle, comprising the above-mentioned motor.

[0035] Through the above technical solution, the cooling oil flowing in from the oil inlet end of the core oil channel flows to the containing groove and the end winding through the first core oil channel and the second core oil channel respectively, so that cooling oil can be provided to different parts of the stator winding at the same time, thereby improving the cooling efficiency of the stator winding, and making the cooling of the stator winding more uniform, further improving the cooling effect and service life of the stator winding.

[0036] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0038] Figure 1 is a three-dimensional schematic diagram of a stator assembly provided by an embodiment of the present disclosure, wherein the stator winding is not shown;

[0039] Figure 2 is a partial side view schematic diagram of a stator assembly provided in one embodiment of the present disclosure;

[0040] Figure 3 is a partially enlarged schematic diagram of a stator assembly provided in one embodiment of the present disclosure;

[0041] Figure 4 is a partial side view schematic diagram of a stator assembly provided in another embodiment of the present disclosure;

[0042] Figure 5 is a three-dimensional schematic diagram of a stator assembly provided in one embodiment of the present disclosure;

[0043] Figure 6 is a cross-sectional schematic diagram of a motor provided by an embodiment of the present disclosure;

[0044] Figure 7 is a partially enlarged schematic diagram of a motor provided in one embodiment of the present disclosure;

[0045] Figure 8 is a side view schematic diagram of a stator assembly provided in one embodiment of the present disclosure;

[0046] Fig. 9 A side view schematic diagram of a stator assembly provided in another embodiment of the present disclosure;

[0047] Fig.10 It is a three-dimensional schematic diagram of a blocking member provided in one embodiment of the present disclosure.

[0048] Description of Reference Numerals

[0049] 10- stator assembly; 200- stator winding; 201- first winding part; 202- second winding part; 300- oil ring; 301- oil injection hole; 400- housing; 401- oil inlet; 402- seal; 403- oil storage chamber; 100- stator core; 1- receiving groove; 11- space; 2- core oil channel; 21- first core oil channel; 211- first connecting oil channel; 212- second connecting oil channel; 213- third connecting oil channel; 22- second core oil channel; 23- first oil hole; 24- oil inlet groove; 25- second oil hole; 3- plugging member; 31- extension; 311- oil passage; 3111- gap; 3112- oil passage; 312- first part; 3121- groove; 313- second part; 32- annular cylinder; 33- plugging part. DETAILED DESCRIPTION

[0050] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0051] In the present disclosure, unless otherwise stated, the directional words used, such as "upper" and "lower", are generally defined based on the drawing direction of the corresponding drawings. They are for the convenience of describing the present disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, and a specific orientation structure and operation, and therefore cannot be understood as a limitation of the present disclosure. "Inside" and "outside" refer to the inside and outside of the contour of the corresponding component. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0052] In the related art, for the cooling of the stator winding, the cooling medium first cools the part of the stator winding located outside the axial channel in the stator core (end winding), and then cools the part of the stator winding located inside the axial channel in the stator core, which easily leads to uneven cooling of the stator winding.

[0053] In view of this, as a first aspect of the present disclosure, Figures 1 to 4 As shown, the present disclosure provides a stator core 100, including a receiving slot 1 and a core oil passage 2, wherein the receiving slot 1 is suitable for receiving a stator winding 200. The core oil passage 2 includes a first core oil passage 21 and a second core oil passage 22, wherein the oil outlet end of the first core oil passage 21 is in communication with the receiving slot 1, so that the core oil passage 2 can supply cooling oil to the receiving slot 1, and the oil outlet end of the second core oil passage 22 extends to the end of the stator core 100, so as to cool the end winding of the stator winding 200 located outside the receiving slot 1.

[0054] In the stator assembly, the stator winding 200 can be accommodated in the accommodating groove 1, and partially protrudes from the end surface of the stator core 100 in the axial direction to form an end winding (such as the second winding portion 202 described below). Since the first core oil passage 21 is connected to the accommodating groove 1, the first core oil passage 21 can supply oil to the accommodating groove 1, and the oil outlet end of the second core oil passage 22 extends to the end of the stator core 100, the cooling oil in the second core oil passage 22 can flow to the end of the stator core 100, thereby spraying on the end of the stator winding 200 protruding from the end surface.

[0055] Through the above technical solution, the cooling oil flowing in from the oil inlet end of the core oil channel 2 flows to the receiving slot 1 and the end winding through the first core oil channel 21 and the second core oil channel 22 respectively, thereby providing cooling oil to different parts of the stator winding 200 (i.e., the part located in the receiving slot 1 and the end winding) at the same time, thereby improving the cooling efficiency of the stator winding 200 and making the cooling of the stator winding 200 more uniform, further improving the cooling effect and service life of the stator winding 200.

[0056] The present disclosure does not limit the position of the oil inlet end of the core oil passage 2. Figure 6 As shown, as an embodiment of the present disclosure, the oil inlet end of the core oil passage 2 is suitable for communicating with the oil inlet 401 on the outer peripheral wall of the motor housing 400. The core oil passage 2 has an oil inlet end and an oil outlet end, and the oil outlet end of the core oil passage 2 is respectively communicated with the receiving groove 1 and the end of the stator core 100, and the oil inlet end of the core oil passage 2 is communicated with the oil inlet 401 on the motor housing 400, and the cooling oil outside the motor can be directly introduced into the receiving groove 1 through the core oil passage 2 to cool the stator winding 200, which is conducive to reducing the heat loss during the cooling oil transportation process and improving the cooling effect.

[0057] The present disclosure does not limit the specific structure of the first core oil passage 21. In one embodiment provided in the present disclosure, the second core oil passage 22 is configured as a first oil hole 23, one end of the first oil hole 23 extends to the end of the stator core 100, and the oil inlet end of the first core oil passage 21 extends to the inner peripheral wall of the first oil hole 23, so that the oil inlet end of the first core oil passage 21 is connected to the first oil hole 23. After the cooling oil enters from the oil inlet end of the first oil hole 23, a part of it reaches the end of the stator core 100 through the first oil hole 23 to cool the end winding of the stator winding 200 located at the end of the stator core 100, and the other part reaches the receiving slot 1 through the first core oil passage 21 connected to the first oil hole 23 to cool the part of the stator winding 200 located in the receiving slot 1. With such an arrangement, the cooling oil is guided to different directions through the first oil hole 23 and the first core oil passage 21 by adopting the method of oil inlet at one end and oil outlet at both ends, so that the cooling of the stator winding 200 is more uniform and the cooling effect is better.

[0058] Alternatively, if Figure 3 As shown, the first core oil passage 21 includes a first connecting oil passage 211 and a second connecting oil passage 212, the first connecting oil passage 211 extends in the radial direction of the stator core 100, the first connecting oil passage 211 is staggered with the corresponding receiving slot 1 in the circumferential direction of the stator core 100, one end of the first connecting oil passage 211 is connected to the first oil hole 23, the other end of the first connecting oil passage 211 is connected to the first end of the second connecting oil passage 212, and the second end of the second connecting oil passage 212 is connected to the receiving slot 1. By adopting the arrangement of the first connecting oil passage 211 and the second connecting oil passage 212, the direction and arrangement of the connecting oil passages can be further refined to meet different cooling requirements. At the same time, the first connecting oil passage 211 extending in the radial direction of the stator core 100 can cool the stator core 100 in the radial direction while the cooling oil flows through the first connecting oil passage 211, further improving the cooling effect.

[0059] To further improve the cooling effect, optionally, Figure 3 As shown, in the radial direction of the stator core 100, the position where the second connecting oil channel 212 is connected to the receiving slot 1 is closer to the inner end of the receiving slot 1 than the outer end of the receiving slot 1. Since the receiving slot 1 extends in the radial direction of the stator core 100, and the stator winding 200 located in the receiving slot 1 is also stacked along the radial direction of the stator core 100, generally, the stator winding 200 closer to the center of the stator core 100 is less likely to be cooled due to the flow direction of the cooling oil. However, the present application sets the position where the second connecting oil channel 212 is connected to the receiving slot 1 to be closer to the inner end of the receiving slot 1, that is, the position where the second connecting oil channel 212 is connected to the receiving slot 1 is closer to the side of the stator winding 200 close to the center of the stator core 100, and the cooling oil flowing in from the second flow channel can directly cool the stator winding 200 close to the center of the stator core 100, thereby improving the cooling effect of the stator winding 200 and further improving the motor performance.

[0060] To improve cooling efficiency, optionally, Figure 3 As shown, the second connecting oil passage 212 is arranged obliquely, and the first end of the second connecting oil passage 212 is located outside the second end. The cooling oil enters the second connecting oil passage 212 from the first connecting oil passage 211 through the first end of the second connecting oil passage 212, and enters the containing tank 1 through the second end of the second connecting oil passage 212. The obliquely arranged second connecting oil passage 212 can reduce the bending of the second connecting oil passage 212, thereby reducing the resistance of the cooling oil flowing in the second connecting oil passage 212 and improving the cooling efficiency.

[0061] On the other hand, the inclined second connecting oil channel 212 can directly connect the first connecting oil channel 211 and the accommodating groove 1. At the same time, since the first end of the second connecting oil channel 212 is located on the outside of the second end, the radial dimension of the first connecting oil channel 211 can be reduced, thereby increasing the distance between the first connecting oil channel 211 and the inner circumferential wall of the stator core 100, increasing the wall thickness of the stator core 100, and improving the structural strength.

[0062] It should be noted that the “inside” and “outside” mentioned above are defined by the inside and outside of the outline of the stator core 100. The end or one side close to the center of the stator core 100 in the radial direction of the stator core 100 is the inner end or the inner side, and the end or one side far from the center of the stator core 100 in the radial direction of the stator core 100 is the outer end or the outer side. For example, Figure 2 and Figure 3 As shown, the inner end of the accommodating slot 1 is an end of the accommodating slot 1 close to the center of the stator core 100 in the radial direction of the stator core 100 .

[0063] Regarding the specific structure of the connecting oil passage, in another embodiment provided by the present disclosure, as Figure 4 As shown, the connecting oil passage includes a third connecting oil passage 213, the third connecting oil passage 213 extends in the radial direction of the stator core 100, and the third connecting oil passage 213 is aligned with the corresponding receiving slot 1 in the circumferential direction of the stator core 100, one end of the third connecting oil passage 213 is communicated with the first oil hole 23, and the other end of the third connecting oil passage 213 is communicated with the corresponding receiving slot 1. It is equivalent to that the inner end of the third connecting oil passage 213 is directly connected to the inner end of the receiving slot 1, and such a design is conducive to shortening the length of the third connecting oil passage 213 in the radial direction of the stator core 100.

[0064] There may be multiple receiving grooves 1, which are arranged at intervals along the circumference of the stator core 100, and there may also be multiple corresponding third connecting oil passages 213 and first oil holes 23. The third connecting oil passages 213 extending along the radial direction of the stator core 100 are aligned with the corresponding receiving grooves 1 in the circumference of the stator core 100, and the two ends of the third connecting oil passages 213 are respectively connected with the receiving grooves 1 and the first oil holes 23. The third connecting oil passages 213 are provided to connect the first oil holes 23 and the receiving grooves 1 at a shorter distance, which can reduce the processing difficulty and processing cost of the connecting oil passages on the one hand, and on the other hand, can reduce the length of the connecting oil passages through which the cooling oil flows, reduce the heat loss of the cooling oil during the flow process, and improve the cooling effect of the stator winding 200.

[0065] In order to connect the first oil hole 23 with the oil inlet 401 on the housing 400 of the motor, optionally, as Figure 5 and Figure 6As shown, the core oil passage 2 further includes an oil inlet groove 24, which is arranged on the outer peripheral wall of the stator core 100 around the circumference of the stator core 100, and the first oil hole 23 is arranged on at least one side wall of the oil inlet groove 24 located in the axial direction of the stator core 100. The cooling oil enters the oil inlet groove 24 through the oil inlet port 401 on the housing 400 of the motor, and the first oil hole 23 is located on the side wall of the oil inlet groove 24 along the axial direction of the stator core 100. The cooling oil in the oil inlet groove 24 can enter the receiving groove 1 through the first oil hole 23 via the connecting oil passage. The oil inlet groove 24 can store cooling oil, which is conducive to buffering the cooling oil flowing in from the oil inlet port 401 and flowing into the receiving groove 1 more evenly and smoothly.

[0066] In addition, when the oil inlet groove 24 is located on the two opposite side walls in the axial direction of the stator core 100 and the first oil holes 23 are provided, the cooling oil in the oil inlet groove 24 can flow in different directions along the axial direction of the stator core 100, thereby flowing to different parts of the stator core 100, thereby improving the cooling effect of the cooling oil on the stator core 100.

[0067] Alternatively, if Figure 5 and Figure 6 As shown, the oil inlet groove 24 is located in the middle of the stator core 100 in the axial direction, and first oil holes 23 are provided on both side walls of the oil inlet groove 24 in the axial direction of the stator core 100. The oil inlet groove 24 located in the middle of the stator core 100 in the axial direction can evenly distribute the cooling oil to two different parts of the stator core 100 in the axial direction through the two first oil holes 23, so that the cooling of the stator core 100 is more uniform.

[0068] To improve the cooling effect, optionally, Figure 1 As shown, the first oil hole 23 extends along the axial direction of the stator core 100, and one end of the first oil hole 23 away from the oil inlet groove 24 extends to the end of the stator core 100. Since the stator winding 200 extends along the axial direction of the stator core 100 in the receiving groove 1 and protrudes from the end surface of the stator core 100, the first oil hole 23 is connected with the receiving groove 1 through the connecting oil passage, and while supplying oil to the receiving groove 1, the end of the first oil hole 23 away from the oil inlet groove 24 extends to the end of the stator core 100, so that a part of the cooling oil in the first oil hole 23 that does not enter the receiving groove 1 can flow out through the opening of the first oil hole 23 on the end surface, so as to be sprayed on the end of the stator winding 200 protruding from the end surface, further improving the cooling effect of the stator winding 200.

[0069] like Figure 1 and Figure 5As shown, the oil inlet groove 24 can be an annular groove, and the number of the receiving grooves 1 is multiple, and the multiple receiving grooves 1 are arranged at intervals around the circumference of the stator core 100. The number of the first oil holes 23 and the number of the connecting oil channels are both multiple, and the multiple first oil holes 23 are arranged at intervals around the circumference of the stator core 100. The number of the first oil holes 23 is the same as the number of the receiving grooves 1, and each first oil hole 23 is connected to the corresponding receiving groove 1 through the corresponding connecting oil channel. In order to generate a magnetic field that can rotate the rotor of the motor through the stator winding 200, the stator winding 200 needs to be arranged around the rotor, and the multiple receiving grooves 1 arranged at intervals around the circumference of the stator core 100 can respectively accommodate a part of the stator winding 200, so that the stator can generate an annular magnetic field.

[0070] In order to cool the stator windings 200 in multiple receiving slots 1 at the same time, the oil inlet groove 24 is set as an annular groove, and multiple first oil holes 23 and connecting oil channels connecting the oil inlet groove 24 and the receiving slots 1 are set. The annular groove can evenly distribute the cooling oil to the multiple first oil holes 23 connected to it, so that the amount of cooling oil entering each receiving slot 1 is the same, so that the stator core 100 is cooled more evenly.

[0071] In order to prevent uneven cooling of the stator winding 200, optionally, as Figure 1 As shown, a second oil hole 25 is provided on at least one side wall of the oil inlet groove 24 located in the axial direction of the stator core 100. The second oil hole 25 extends along the axial direction of the stator core 100, and the second oil hole 25 extends to the end of the stator core 100 away from one end of the oil inlet groove 24. The second oil hole 25 is provided to directly connect the oil inlet groove 24 and the end of the stator core 100, so that a part of the cooling oil in the oil inlet groove 24 can directly reach the end of the stator core 100 through the second oil hole 25, and is sprayed out from the hole of the second oil hole 25 located on the end surface, so as to directly cool the end of the stator winding 200, prevent uneven cooling caused by the end of the stator winding 200 not being in the receiving groove 1, and improve the cooling effect of the stator winding 200.

[0072] Alternatively, if Figure 1 As shown, the number of the first oil holes 23 and the number of the second oil holes 25 are both multiple, and on the same side wall, the second oil holes 25 and the first oil holes 23 are arranged at equal intervals around the circumference of the stator core 100. The multiple first oil holes 23 and the second oil holes 25 arranged at equal intervals can deliver the cooling oil to the receiving slots 1 and spray it to the ends of the stator windings 200 as evenly as possible, thereby meeting the cooling requirements of the multiple receiving slots 1 and the ends of the multiple stator windings 200.

[0073] As a second aspect of the present disclosure, Figure 5As shown, the present invention provides a stator assembly 10, including a stator winding 200 and the above-mentioned stator core 100. The stator winding 200 includes a first winding portion 201 and a second winding portion 202, wherein the first winding portion 201 is accommodated in an accommodating slot 1, and the second winding portion 202 extends out of the accommodating slot 1 along the axial direction of the stator winding 200, and the second winding portion 202 is configured as an end winding. The first winding portion 201 located in the accommodating slot 1 can be cooled by being immersed in cooling oil, and part of the cooling oil in the accommodating slot 1 can flow to the second winding portion 202 along the connection between the first winding portion 201 and the second winding portion 202, thereby cooling the second winding portion 202.

[0074] In order to improve the cooling effect of the second winding portion 202, optionally, as Figure 5 As shown, the stator assembly 10 further includes two oil rings 300, which are respectively arranged at the two ends of the stator core 100. The oil rings 300 are used to be sleeved on the outside of the second winding part 202. The oil rings 300 are provided with oil spray holes 301, which are suitable for communicating with the oil inlet 401 on the housing 400 of the motor. Since the oil rings 300 are sleeved on the outside of the second winding part 202, the cooling oil from the oil inlet 401 can be sprayed inwardly on the second winding part 202 through the oil spray holes 301, thereby cooling the second winding part 202. The two oil rings 300 are respectively arranged at the two ends of the stator core 100, so that the second winding part 202 located at the two ends of the stator core 100 can be cooled, and the cooling of the stator winding 200 is more uniform.

[0075] Alternatively, if Figures 1 to 4 and Figure 8 As shown, the stator assembly 10 may also include a blocking member 3, and the receiving slot 1 of the stator core 100 has an opening extending to the inner peripheral wall of the stator core 100, and the blocking member 3 is suitable for blocking the opening. The blocking member 3 is arranged at the opening of the receiving slot 1, which can prevent the cooling oil flowing into the receiving slot 1 from the first core oil channel 21 from entering the air gap between the stator core 100 and the rotor of the motor through the opening of the receiving slot 1, thereby reducing the resistance of the cooling oil to the operation of the rotor and reducing the power loss of the motor. At the same time, using the blocking member 3 to block the opening of the receiving slot 1 can also allow more cooling oil to remain in the receiving slot 1, so as to improve the cooling effect of the cooling oil on the stator winding 200 and improve the performance of the motor.

[0076] Alternatively, if Figure 2 and Figure 3As shown, the plugging member 3 has an extension portion 31 extending into the receiving groove 1, and the extension portion 31 is provided with an oil passage 311, and the oil passage 311 is used to connect the space 11 of the receiving groove 1 suitable for accommodating the stator winding 200 with the second connecting oil passage 212. Since the position where the second connecting oil passage 212 is connected to the receiving groove 1 is closer to the inner end of the receiving groove 1 than the outer end of the receiving groove 1, that is, the position where the second connecting oil passage 212 is connected to the receiving groove 1 is closer to the setting position of the plugging member 3, the oil passage 311 is provided on the extension portion 31 of the plugging member 3, so that the cooling oil can enter the space 11 of the receiving groove 1 for accommodating the stator winding 200 after passing through the oil passage 311 from the second connecting oil passage 212, thereby cooling the stator winding 200, and while the opening of the receiving groove 1 is blocked by the plugging member 3, the cooling oil can also be allowed to pass through, thereby ensuring the cooling effect of the stator core 100.

[0077] The present disclosure does not limit the specific structure of the extension portion 31. In one embodiment provided in the present disclosure, Figure 3 As shown, the extension portion 31 includes a first portion 312 and a second portion 313, the first portion 312 is used to block the opening, and the second portion 313 is used to support the stator winding 200. The first portion 312 and the second portion 313 have a gap 3111 in the radial direction of the stator core 100, the gap 3111 is connected to the second end of the second connecting oil passage 212, and the second portion 313 is provided with an oil passing groove 3112, the oil passing groove 3112 connects the gap 3111 between the first portion 312 and the second portion 313 and the space 11 of the accommodating slot 1 for accommodating the stator winding 200, and the oil passing passage 311 includes the oil passing groove 3112 and the gap 3111. Since the connecting position between the second connecting oil channel 212 and the receiving groove 1 is closer to the inner end of the receiving groove 1 than the outer end of the receiving groove 1, that is, the connecting position between the second connecting oil channel 212 and the receiving groove 1 is closer to the setting position of the sealing member 3, the sealing member 3 should, on the one hand, block the opening to prevent the cooling oil from entering the air gap, and on the other hand, allow the cooling oil to pass through to cool the stator winding 200 in the receiving groove 1.

[0078] Since the blocking piece 3 is arranged at the opening, the stator winding 200 tends to move toward the opening under the action of gravity. In order to enable the blocking piece 3 to play a role of sealing and supporting, the second part 313 of the extension part 31 is in contact with the stator winding 200, thereby playing a role of supporting the stator winding 200.

[0079] While blocking the opening and supporting the stator winding 200, in order to allow the cooling oil to pass through, a gap 3111 is provided between the first portion 312 and the second portion 313, and the gap 3111 is connected to the second end of the second connecting oil passage 212, so that the cooling oil can enter the gap 3111. Furthermore, an oil passage groove 3112 is provided on the second portion 313, and the gap 3111 is connected to the space 11 of the receiving groove 1 for receiving the stator winding 200 through the oil passage groove 3112, and finally the cooling oil is introduced into the space 11 to cool the stator winding 200.

[0080] Such a configuration enables the extension portion 31 of the sealing member 3 to simultaneously achieve three functions, namely, first, to seal the opening of the receiving groove 1 to prevent cooling oil from entering the air gap and affecting the motor efficiency; second, to support the stator winding 200 to prevent the stator winding 200 from slipping out of the opening; and third, to guide the cooling oil through the oil passage 311 to the space 11 of the receiving groove 1 for accommodating the stator winding 200, so as to cool the stator winding 200.

[0081] Alternatively, if Figure 3 As shown, a groove 3121 is provided on the surface of the first part 312 facing the second part 313. The first part 312 and the second part 313 have a gap 3111 in the radial direction of the stator core 100, and a groove 3121 is provided on the surface of the first part 312 facing the second part 313. The groove 3121 can be connected with the gap 3111, so that the size of the gap 3111 along the radial direction of the stator core 100 is larger, thereby further increasing the size of the oil passage 311 to accommodate more cooling oil, thereby improving the cooling effect on the stator winding 200.

[0082] The present disclosure does not limit the specific structure of the blocking member 3. Optionally, Fig. 9 As shown, in one embodiment of the present disclosure, the blocking member 3 includes an annular cylinder 32 and a blocking portion 33 disposed on the outer peripheral wall of the annular cylinder 32, and the blocking portion 33 is used to block the opening. Since the stator core 100 is an annular structure, the opening of the receiving groove 1 is disposed on the inner wall of the annular structure, and an annular cylinder 32 matching the stator core 100 is disposed, and the annular cylinder 32 is disposed in the annular structure, the blocking portion 33 disposed on the outer peripheral wall of the annular cylinder 32 can be fixed between the stator core 100 and the annular cylinder 32, so that the blocking portion 33 is fixed at the opening of the receiving groove 1, so as to prevent the cooling oil in the receiving groove 1 from entering the air gap between the stator core 100 and the rotor of the motor through the opening.

[0083] There may be a plurality of blocking portions 33 to cope with a plurality of receiving slots 1 on the stator core 100 , and the plurality of blocking portions 33 may be arranged on the outer peripheral wall of the annular cylinder 32 at intervals around the center of the annular cylinder 32 .

[0084] In the present disclosure, optionally, the blocking piece 3 is integrally formed with the stator core 100. The blocking piece 3 integrally formed with the stator core 100 can, on the one hand, be adapted to the size of the stator core 100, and can reduce the gap 3111 caused by the mismatch in size, further improving the blocking effect of the blocking piece 3; on the other hand, it can also reduce the difficulty of processing the blocking piece 3 and improve the processing efficiency of the stator core 100.

[0085] Here, it should be noted that the present disclosure does not limit the specific materials and processes for one-piece molding. For example, the plugging member 3 can be a plastic member that is one-piece molded by injection molding, or the plugging member 3 can be a metal member that is one-piece molded by casting.

[0086] As a third aspect of the present disclosure, the present disclosure provides a motor, comprising the above-mentioned stator assembly 10. The type of the motor may include but is not limited to a permanent magnet synchronous motor.

[0087] Alternatively, if Figure 6 As shown, the motor further includes a housing 400, the interior of the housing 400 is provided with a cavity, the stator assembly 10 is arranged in the cavity, and an oil inlet 401 is provided on the outer peripheral wall of the housing 400, and the oil inlet 401 is connected to the receiving groove 1 through the iron core oil passage 2. The housing 400 is sleeved outside the motor to protect the motor, and the oil inlet 401 is arranged on the outer peripheral wall of the housing 400, so that the cooling oil outside the motor can be directly introduced into the receiving groove 1 through the iron core oil passage 2 to cool the stator winding 200, which is conducive to reducing the heat loss during the cooling oil transportation process and improving the cooling effect.

[0088] Alternatively, if Figure 6 As shown, the oil inlet 401 is located in the middle of the housing 400 in the axial direction, so that in the axial direction of the stator core 100, the position of the oil inlet 401 can be aligned with the position of the oil inlet end of the core oil passage 2 on the stator core 100. The oil inlet 401 located in the middle of the housing 400 in the axial direction can cooperate with the oil inlet end of the core oil passage 2, so that the cooling oil can better enter the stator core 100.

[0089] In order to make the cooling of the second winding part 202 more uniform, optionally, as Figure 6 and Figure 7As shown, the stator assembly 10 further includes two oil rings 300, which are respectively arranged at both ends of the stator core 100. The oil rings 300 are used to be sleeved on the outside of the second winding part 202. The oil rings 300 are provided with oil injection holes 301, which are suitable for communicating with the oil inlet 401 on the housing 400 of the motor. At least two sealing members 402 are arranged between the outer peripheral wall of the oil ring 300 and the inner peripheral wall of the housing 400. The two sealing members 402 are arranged at intervals along the axial direction of the stator core 100. In the axial direction of the stator core 100, the oil injection hole 301 is located between the two sealing members 402.

[0090] Since the oil ring 300 is used to be sleeved on the outside of the second winding part 202 and abuts against the end face of the stator core 100, the seal 402 is arranged between the outer peripheral wall of the oil ring 300 and the inner peripheral wall of the housing 400, so that the outer peripheral wall of the oil ring 300, the inner peripheral wall of the housing 400, the end face of the stator core 100 and the seal 402 can form an oil storage chamber 403, and the oil storage chamber 403 can be connected with the oil inlet groove 24 through the first oil hole 23 and the second oil hole 25 located on the end face of the stator core 100, and the cooling oil is sprayed on the second winding part 202 through the oil spray hole 301. The oil storage chamber 403 can ensure the supply of cooling oil, so that the oil spray hole 301 can discharge oil more continuously and evenly, thereby improving the cooling effect.

[0091] In addition, two oil rings 300 are respectively arranged at the two ends of the stator core 100, and the seals 402 are arranged corresponding to the oil rings 300, so that two oil storage cavities 403 are formed at the two ends of the stator core 100, corresponding to the second winding parts 202 at the two axial ends of the stator core 100, so that the cooling is more uniform.

[0092] As a fourth aspect of the present disclosure, the present disclosure provides a vehicle, comprising the above-mentioned motor. It is understandable that in the present disclosure, the vehicle can be a pure electric vehicle or a hybrid vehicle, and the present disclosure does not limit this.

[0093] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0094] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0095] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A stator core, characterized in that: include: A receiving slot, adapted to receive a stator winding; as well as The core oil channel includes a first core oil channel and a second core oil channel. The oil outlet end of the first core oil channel is connected to the receiving groove so that the core oil channel can supply cooling oil to the receiving groove. The oil outlet end of the second core oil channel extends to the end of the stator core to cool the end winding of the stator winding located outside the receiving groove.

2. The stator core according to claim 1, characterized in that: The second core oil passage is configured as a first oil hole, one end of the first oil hole extending to the end of the stator core; The oil inlet end of the first core oil passage extends to the inner peripheral wall of the first oil hole.

3. The stator core according to claim 2, characterized in that: The first core oil passage includes a first connecting oil passage and a second connecting oil passage; The first connecting oil channel extends in the radial direction of the stator core, and is staggered with the corresponding accommodating groove in the circumferential direction of the stator core. One end of the first connecting oil channel is connected to the first oil hole, and the other end of the first connecting oil channel is connected to the first end of the second connecting oil channel, and the second end of the second connecting oil channel is connected to the accommodating groove.

4. The stator core according to claim 3, characterized in that: In the radial direction of the stator core, the position where the second connecting oil passage is connected to the accommodating groove is closer to the inner end of the accommodating groove than to the outer end of the accommodating groove.

5. The stator core according to claim 4, characterized in that: The second connecting oil passage is arranged obliquely, and the first end of the second connecting oil passage is located outside the second end.

6. The stator core according to claim 2, characterized in that: The second core oil passage includes a third connecting oil passage; The third connecting oil channel extends in the radial direction of the stator core, and the third connecting oil channel is aligned with the corresponding receiving groove in the circumferential direction of the stator core. One end of the third connecting oil channel is connected to the first oil hole, and the other end of the third connecting oil channel is connected to the corresponding receiving groove.

7. The stator core according to any one of claims 2 to 6, characterized in that: The core oil passage also includes an oil inlet groove, which is arranged on the outer peripheral wall of the stator core around the circumference of the stator core. The first oil hole is arranged on at least one side wall of the oil inlet groove located in the axial direction of the stator core.

8. The stator core according to claim 7, characterized in that: The oil inlet groove is located in the middle of the stator core in the axial direction, and the first oil holes are provided on both side walls of the oil inlet groove in the axial direction of the stator core.

9. The stator core according to claim 7, characterized in that: The oil inlet groove is an annular groove, the number of the receiving grooves is multiple, and the multiple receiving grooves are arranged at intervals around the circumference of the stator core; The number of the first oil holes and the number of the second core oil passages are both multiple, and the multiple first oil holes are arranged at intervals around the circumference of the stator core; The number of the first oil holes is the same as the number of the accommodating grooves, and each of the first oil holes is connected to the corresponding accommodating groove through the corresponding second core oil passage.

10. The stator core according to claim 7, characterized in that: A second oil hole is provided on at least one side wall of the oil inlet groove in the axial direction of the stator core; The second oil hole extends along the axial direction of the stator core, and one end of the second oil hole away from the oil inlet groove extends to the end of the stator core.

11. The stator core according to claim 10, characterized in that: The number of the first oil holes and the number of the second oil holes are both plural, and on the same side wall, the second oil holes and the first oil holes are arranged at equal intervals around the circumference of the stator core.

12. A stator assembly, characterized in that: comprising a stator winding and a stator core according to any one of claims 1 to 11; The stator winding includes a first winding portion and a second winding portion, wherein the first winding portion is accommodated in the accommodation slot, the second winding portion extends out of the accommodation slot in the axial direction of the stator winding, and the second winding portion is configured as the end winding.

13. The stator assembly according to claim 12, characterized in that The stator assembly also includes two oil rings, which are respectively arranged at both ends of the stator core. The oil rings are used to be sleeved on the outside of the second winding part. The oil rings are provided with oil injection holes, and the oil injection holes are suitable for communicating with the oil inlet on the motor housing.

14. A motor, characterized in that: Comprising the stator assembly according to claim 12 or 13.

15. The motor according to claim 14, characterized in that The motor further comprises a housing, a cavity is provided inside the housing, and the stator assembly is arranged in the cavity; An oil inlet is arranged on the outer peripheral wall of the shell, and the oil inlet is communicated with the containing groove through the iron core oil passage.

16. The motor according to claim 15, characterized in that The oil inlet is located in the middle of the housing in the axial direction, so that in the axial direction of the stator core, the position of the oil inlet can be aligned with the position of the oil inlet end of the core oil channel on the stator core.

17. The motor according to claim 15, characterized in that The stator assembly further includes two oil rings, which are respectively arranged at two ends of the stator core, and are used to be sleeved on the outside of the second winding part. The oil rings are provided with oil injection holes, and the oil injection holes are suitable for communicating with the oil inlet on the housing of the motor; At least two seals are provided between the outer circumferential wall of the oil ring and the inner circumferential wall of the housing. The two seals are spaced apart along the axial direction of the stator core. In the axial direction of the stator core, the oil injection hole is located between the two seals.

18. A vehicle, characterized in that: A motor comprising any one of claims 14-17.

Images