Motor stator and motor

Abstract

The invention provides a motor stator and a motor, and the motor stator comprises an annular iron core which is provided with an annular oil channel, at least one end of the annular iron core is a spraying end, the spraying end is provided with a plurality of spraying ports, and each spraying port is communicated with the annular oil channel; the annular iron core comprises a first arc section and a second arc section in the circumferential direction, and the first arc section and the second arc section are oppositely arranged in the radial direction of the annular iron core. At the spraying end, the first arc section and the second arc section respectively comprise at least one spraying opening, and the spraying opening of the first arc section is larger than the spraying opening of the second arc section. The cooling oil in the motor stator can be redistributed, the cooling uniformity of the motor stator is improved, and the cooling effect of the motor is guaranteed.

Description

Technical Field

[0001] This application relates to the field of motor cooling and heat dissipation technology, and in particular to a motor stator and a motor. Background Technology

[0002] Motors generate a significant amount of heat during operation. Excessive motor temperature can negatively impact performance, and in severe cases, damage the insulation and cause permanent demagnetization of the permanent magnets. Therefore, effective motor cooling is essential for efficient and stable operation. Current technology primarily involves spray nozzles on the stator core end face, from which cooling oil is sprayed onto the windings. With this cooling structure, the distribution of cooling oil depends on the location of the oil inlet. Spray nozzles closer to the inlet have higher oil pressure, while those farther away have lower pressure. Therefore, the spraying effect is highly dependent on the inlet's location; improper inlet placement directly leads to poor cooling performance. Summary of the Invention

[0003] This application provides a motor stator and a motor to achieve redistribution of cooling oil within the motor stator, improve the uniformity of motor stator cooling, and ensure the cooling effect of the motor.

[0004] The first aspect of this application provides an electric motor stator, which includes: An annular iron core is provided with an annular oil channel. At least one end of the annular iron core is a spray end, and the spray end is provided with a plurality of spray nozzles, each of which is connected to the annular oil channel. The annular core includes a first arc segment and a second arc segment along the circumferential direction, and the first arc segment and the second arc segment are arranged opposite to each other along the radial direction of the annular core; At the spray end, the first arc segment and the second arc segment each include at least one spray nozzle, and the spray nozzle of the first arc segment is larger than the spray nozzle of the second arc segment.

[0005] Optionally, at the spray end, each spray nozzle gradually increases in size along the circumferential direction from the center of the second arc segment to the center of the first arc segment.

[0006] Optionally, at the spray end, the spray angle of the spray nozzle of the first arc segment is greater than the spray angle of the spray nozzle of the second arc segment.

[0007] Optionally, at the spray end, along the circumferential direction from the center of the second arc segment to the center of the first arc segment, the spray angle of each spray nozzle gradually increases.

[0008] Optionally, at the spray end, along the direction from the center of the second arc segment to the center of the first arc segment, each of the spray nozzles gradually moves away from the axis of the annular iron core.

[0009] Optionally, between the annular oil passage and the spray nozzle, the annular core is provided with a first axial channel, a second axial channel and a third axial channel connected in sequence. The first axial channel, the second axial channel and the third axial channel form a stepped structure that gradually approaches the axis of the annular core, and the outlet of the third axial channel forms the spray nozzle.

[0010] Optionally, along the circumferential direction from the center of the second arc segment to the center of the first arc segment, each of the third axial channels gradually moves away from the axis of the annular core.

[0011] Optionally, along the circumferential direction from the center of the second arc segment to the center of the first arc segment, each of the second axial channels gradually moves away from the axis of the annular core.

[0012] Optionally, the second axial channel includes two feed holes arranged circumferentially along the annular core; The third axial channel includes two first exit holes and two second exit holes, each of which is arranged circumferentially along the annular core. The second exit holes are smaller than the first exit holes, and the two second exit holes are sandwiched between the two first exit holes.

[0013] A second aspect of this application provides an electric motor, which includes an electric motor housing and any of the electric motor stators provided in this application, wherein the annular iron core is installed in the electric motor housing in a horizontal direction, and the first arc segment is located directly above the second arc segment.

[0014] The technical solution provided in this application can achieve the following beneficial effects: The motor stator provided in this application includes an annular iron core with an annular oil channel. At least one end of the annular iron core is a spray end with multiple spray nozzles, each connected to the annular oil channel, allowing cooling oil within the annular oil channel to be sprayed out. The annular iron core includes a first arc segment and a second arc segment along its circumference, with the first and second arc segments arranged radially opposite each other. At the spray end, each of the first and second arc segments includes at least one spray nozzle, with the spray nozzle of the first arc segment being larger than that of the second arc segment. This results in lower oil spray resistance at the spray nozzle of the first arc segment and higher oil spray resistance at the spray nozzle of the second arc segment, allowing more cooling oil to flow towards the spray nozzle of the first arc segment. This achieves a redistribution of cooling oil within the motor stator. By simply installing the first arc segment towards the location requiring a larger oil spray volume, the uniformity of motor stator cooling can be improved, ensuring the effective cooling of the motor.

[0015] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the motor stator provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a spray end provided in an embodiment of this application; Figure 3 This is a schematic diagram of another spray end structure provided in an embodiment of this application; Figure 4 This is a schematic diagram of the axial channel connecting the spray nozzles provided in an embodiment of this application; Figure 5 This is a schematic diagram of the axial channel connecting the spray nozzle at location A; Figure 6 This is a schematic diagram of the axial channel connecting the spray nozzle at location B. Figure 7 This is a three-dimensional structural diagram of the axial channel connecting the spray nozzles provided in an embodiment of this application.

[0017] Figure label: 1-Toroidal iron core; 1a - First arc segment; 1b - Second arc segment; 11- Annular oil passage; 12-Spray end; 121 - Spray nozzle; 13-First axial channel; 14 - Second axial channel; 141 - Conveying hole; 15 - Third axial channel; 151 - First exit port; 152 - Second exit port; 2-Stator winding; 21-Straight line segment; 22-Forming section. The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0019] In the description of this application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected," "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0020] In the description of this specification, it should be understood that the directional terms such as "upper" and "lower" used in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should also be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0021] like Figure 1 As shown, this application embodiment provides a motor stator that can be installed inside a motor housing and, together with the motor housing, electronic rotor, and other components, constitutes a motor. The motor stator includes an annular core 1 and a stator winding 2, with the positioning winding wound around the annular core 1. The annular core 1 has an annular oil passage 11, meaning that an oil inlet can be provided on the outer periphery of the annular oil passage 11, connecting to an external oil circuit, allowing cooling oil from the external oil circuit to flow into the annular oil passage 11 through the inlet. At least one end of the annular core 1 is a spray end 12, which has multiple spray nozzles 121, each connected to the annular oil passage 11 (for example, the spray nozzle 121 can be connected to the annular oil passage 11 through an axial channel), allowing cooling oil within the annular oil passage 11 to be sprayed out through the spray nozzles 121. The end of the stator winding 2 is exposed outside the spray end 12, allowing the oil sprayed from the spray nozzles 121 to fall onto the stator winding 2, achieving spray cooling of the stator winding 2.

[0022] Specifically, the portion of the stator winding 2 exposed at the spray end 12 includes a straight section 21 and a forming section 22, with the straight section 21 located between the spray end 12 and the forming section 22. When the oil sprayed from the spray nozzle 121 falls onto the forming section 22, the oil can form a flowing and covering effect along the forming section 22, resulting in a good spraying effect. When the oil sprayed from the spray nozzle 121 falls onto the straight section 21 (for example, when the oil pressure is too low), the oil leaks directly down from the straight section 21, resulting in a poor spraying effect. When the oil sprayed from the spray nozzle 121 falls outside the end face of the stator winding 2 (for example, when the oil pressure is too high), the oil cannot contact the stator winding 2, resulting in a poor spraying effect.

[0023] In related technologies, the distribution of cooling oil depends on the position of the oil inlet. Specifically, only by using a high-position oil inlet, so that the upper spray nozzle 121 receives higher oil pressure and the lower spray nozzle 121 receives lower oil pressure, can the cooling oil above the stator winding 2 flow downwards under gravity to cover it, thus forming a uniform coverage of the oil along the circumference of the stator winding 2 and achieving a relatively uniform cooling effect for the motor stator. When a low-position oil inlet is used, the lower spray nozzle 121 receives higher oil pressure and the upper spray nozzle 121 receives lower oil pressure, resulting in very little cooling oil above the stator winding 2, making it difficult to achieve a uniform cooling effect for the motor stator.

[0024] like Figure 2 and Figure 3 As shown, further, the annular core 1 of this embodiment includes a first arc segment 1a and a second arc segment 1b along the circumferential direction, and the first arc segment 1a and the second arc segment 1b are arranged opposite each other along the radial direction of the annular core 1. At the spray end 12, the first arc segment 1a and the second arc segment 1b each include at least one spray nozzle 121, and the spray nozzle 121 of the first arc segment 1a is larger than the spray nozzle 121 of the second arc segment 1b, that is, the spray nozzle 121 of the first arc segment 1a is larger and the spray nozzle 121 of the second arc segment 1b is smaller. This results in lower oil spray resistance at the spray nozzle 121 of the first arc segment 1a and higher oil spray resistance at the spray nozzle 121 of the second arc segment 1b, allowing more cooling oil to flow to the spray nozzle 121 of the first arc segment 1a. This achieves a redistribution of the cooling oil within the motor stator. By simply installing the first arc segment 1a towards a location requiring a larger oil spray volume (e.g., directly above the stator core), the uniformity of motor stator cooling can be improved, ensuring the motor's cooling effect.

[0025] Specifically, in the embodiments of this application, only the example of the annular core 1 extending horizontally with the first arc segment 1a facing upwards and the second arc segment 1b facing downwards is described in detail. When the motor stator is installed into the motor housing with the first arc segment 1a facing upwards and the second arc segment 1b facing downwards, the spray nozzles 121 of the spray end 12 are distributed in a manner that is larger at the top and smaller at the bottom. On the one hand, the larger spray nozzle 121 of the first arc segment 1a receives and sprays a larger amount of cooling oil, while the smaller spray nozzle 121 of the second arc segment 1b receives and sprays a smaller amount of cooling oil. That is, more cooling oil is sprayed onto the top of the stator winding 2, and less cooling oil is sprayed onto the bottom of the stator winding 2. On the other hand, under the action of gravity, the cooling oil above the stator winding 2 automatically flows down to cover the bottom of the stator winding 2, reducing the amount of cooling oil above the stator winding 2 and increasing the amount of cooling oil below the stator winding 2. This allows the cooling oil to evenly cover the entire circumference of the stator winding 2, achieving uniform cooling of the motor stator. Therefore, regardless of where the oil inlet is located in the annular core 1, the cooling oil flowing into the stator core can be redistributed, thereby improving the uniformity of motor stator cooling.

[0026] In this ring-shaped iron core 1, two opposite positions on the same diameter are designated as positions A and B. The first arc segment 1a can be an arc extending from the center to both sides at position A, and the second arc segment 1b can be an arc extending from the center to both sides at position B. The first arc segment 1a and the second arc segment 1b can form a portion of the ring-shaped iron core 1 along the circumference. For example, both the first arc segment 1a and the second arc segment 1b are minor arcs, and other arc segments are interspersed between them. The first arc segment 1a and the second arc segment 1b can also perfectly form the complete ring-shaped iron core 1. For example, both the first arc segment 1a and the second arc segment 1b are semicircles, or the first arc segment 1a and the second arc segment 1b are complementary major and minor arcs, respectively.

[0027] Furthermore, at the spray end 12, along the circumferential direction from the center of the second arc segment 1b to the center of the first arc segment 1a (i.e., along the circumferential direction from position B to position A), the size of each spray nozzle 121 gradually increases. In other words, the size of each spray nozzle 121 at the spray end 12 is gradually distributed in the circumferential direction, thus ensuring a reasonable distribution of cooling oil to each spray nozzle 121. Specifically, from the center of the second arc segment 1b towards both sides, up to the center of the first arc segment 1a, the oil spray resistance of each spray nozzle 121 gradually decreases, thereby gradually increasing the amount of cooling oil distributed from the center of the second arc segment 1b towards both sides, up to the center of the first arc segment 1a. This results in a more reasonable distribution of cooling oil and further improves the uniformity of motor stator cooling.

[0028] Specifically, when the motor stator is installed into the motor housing with the first arc segment 1a facing upward and the second arc segment 1b facing downward: on the one hand, along the upward direction, the amount of cooling oil distributed and sprayed by each spray nozzle 121 gradually increases, that is, the amount of cooling oil sprayed onto the stator winding 2 gradually decreases from top to bottom; on the other hand, under the action of gravity, along the downward direction, the amount of cooling oil obtained by the stator winding 2 through the flow and coverage gradually increases, thereby making the distribution of cooling oil more reasonable and further improving the uniformity of motor stator cooling.

[0029] like Figure 3 As shown, further, at the spray end 12, along the direction from the center of the second arc segment 1b to the center of the first arc (i.e., along the circumferential direction from position B to position A), each spray nozzle 121 gradually moves away from the axis of the annular core 1, thereby making the oil sprayed from each spray nozzle 121 more rationally distributed in the axial direction of the stator winding 2, further improving the uniformity of motor stator cooling. Specifically, when the spray nozzle 121 moves away from the axis of the annular core 1, the spray nozzle 121 and its internal axial channel can be shifted outward as a whole. At this time, the spray angle α of the spray nozzle 121 remains unchanged, and the oil sprayed from the spray nozzle 121 is shifted outward as a whole, thereby forming a larger axial coverage area on the stator winding 2; or, the axial channel where the spray nozzle 121 is located can be shifted outward. At this time, the spray angle α of the spray nozzle 121 increases, thereby forming a larger axial coverage area on the stator winding 2.

[0030] like Figures 4-6 As shown, further, at the spray end 12, the maximum angle that can be formed between the oil sprayed from the spray nozzle 121 and the spray end 12 is the spray angle α. The spray angle α of the spray nozzle 121 of the first arc segment 1a is greater than the spray angle α of the spray nozzle 121 of the second arc segment 1b. That is to say, the oil sprayed from the spray nozzle 121 of the first arc segment 1a is closer to the axial direction of the annular iron core 1, and the oil sprayed from the spray nozzle 121 of the second arc segment 1b is closer to the end face direction of the annular iron core 1. This allows the oil sprayed from both the larger and smaller spray nozzles 121 to fall at the appropriate axial position of the stator winding 2.

[0031] Specifically, under the same pressure, the smaller the spray nozzle 121, the faster the flow rate of the sprayed oil and the greater the spray distance; conversely, the larger the spray nozzle, the slower the flow rate of the sprayed oil and the smaller the spray distance. The larger spray nozzle 121 on the first arc segment 1a is set with a larger spray angle α, which allows the oil sprayed from the spray nozzle 121 on the first arc segment 1a to be further away from the spray end 12, increasing the axial coverage area of ​​the oil along the annular core 1, thereby creating a more uniform flow coverage effect. The smaller spray nozzle 121 on the second arc segment 1b is set with a smaller spray angle α, which allows the oil sprayed from the spray nozzle 121 on the second arc segment 1b to be closer to the spray end 12, reducing the axial coverage area of ​​the oil along the annular core 1 and preventing the oil from exceeding the end face of the stator winding 2.

[0032] Furthermore, at the spray end 12, along the circumferential direction from the center of the second arc segment 1b to the center of the first arc segment 1a (i.e., along the circumferential direction from position B to position A), the spray angle α of each spray nozzle 121 gradually increases. That is, in the circumferential direction, the spray angle α1 of the spray nozzle 121 at position A is the largest, and the spray angle α2 of the spray nozzle 121 at position A is the smallest. The spray angle α of each spray nozzle 121 between positions A and B is gradually distributed. This allows the oil sprayed from each spray nozzle 121 to gradually approach the axial direction of the annular core 1 from the center of the second arc segment 1b towards both sides, up to the center of the first arc segment 1a. The area covered by the oil sprayed from each spray nozzle 121 along the axial direction of the stator winding 2 gradually increases, thus making the distribution of the oil sprayed from each spray nozzle 121 along the axial direction of the stator winding 2 more reasonable, further improving the uniformity of motor stator cooling.

[0033] Furthermore, between the annular oil passage 11 and the spray nozzle 121, the annular core 1 is provided with a first axial channel 13, a second axial channel 14, and a third axial channel 15 connected in sequence. The first axial channel 13, the second axial channel 14, and the third axial channel 15 form a stepped structure that gradually approaches the axis of the annular core 1, and the outlet of the third axial channel 15 forms the spray nozzle 121. This can extend the flow path of the oil spray and increase the flow resistance of the oil spray, which can not only allow the oil to better fill the stator core and achieve contact cooling of the stator core, but also allow the oil sprayed from the spray nozzle 121 to be better sprayed onto the stator winding 2, achieving spray cooling of the stator winding 2.

[0034] Specifically, the first axial channel 13 extends along the axial direction of the annular core 1 and connects to the annular oil passage 11; the second axial channel 14 is translated relative to the first axial channel 13 in a direction closer to the axis of the annular core 1, and the inlet end of the second axial channel 14 overlaps with the outlet end of the first axial channel 13, thereby connecting the second axial channel 14 to the first axial channel 13; the third axial channel 15 is translated relative to the second axial channel 14 in a direction closer to the axis of the annular core 1, and the inlet end of the third axial channel 15 overlaps with the outlet end of the second axial channel 14, thereby connecting the third axial channel 15 to the second axial channel 14. The angle between the line connecting the near point of the outlet end of the first axial channel 13 (i.e., the point of the outlet end closest to the axis of the annular core 1) and the far point of the inlet end of the third axial channel 15 (i.e., the point of the inlet end furthest from the axis of the annular core 1) and the spray end 12 is the spray angle α.

[0035] Furthermore, along the circumferential direction from the center of the second arc segment 1b to the center of the first arc segment 1a (i.e., along the circumferential direction from bottom to top), each third axial channel 15 gradually moves away from the axis of the annular core 1, thereby gradually increasing the spray angle α of each spray nozzle 121 and gradually increasing the axial coverage area formed by each spray nozzle 121 on the stator winding 2, thereby improving the uniformity of motor stator cooling.

[0036] Furthermore, along the circumferential direction from the center of the second arc segment 1b to the center of the first arc segment 1a (i.e., along the circumferential direction from position B to position A), each of the second axial channels 14 gradually moves away from the axis of the annular core 1, thereby creating an appropriately sized overlap area between the third axial channel 15 and the second axial channel 14 to ensure smooth spraying of cooling oil. For example, at the spray nozzle 121 at position A, the third axial channel 15 and the second axial channel 14 can form an overlap area with a width d1 of approximately 1 mm in the radial direction; at the spray nozzle 121 at position B, the third axial channel 15 and the second axial channel 14 can form an overlap area with a width d2 of approximately 0.5 mm in the radial direction.

[0037] like Figure 7As shown, the second axial channel 14 further includes two conveying holes 141, which are arranged circumferentially along the annular core 1. The third axial channel 15 includes two first ejection holes 151 and two second ejection holes 152, which are arranged circumferentially along the annular core 1. The second ejection holes 152 are smaller than the first ejection holes 151, and the two second ejection holes 152 are sandwiched between the two first ejection holes 151. This allows the oil to be dispersed circumferentially in stages during the conveying process, and the oil sprayed from the spray nozzle 121 forms a uniform fan-shaped dispersion pattern circumferentially. This ensures that the oil is evenly dispersed on the surface of the stator winding 2, avoiding localized overheating caused by uneven oil distribution and improving the uniformity and stability of the motor stator cooling.

[0038] Specifically, the liquid within the first axial channel 13 is dispersed into two streams of equal size, which flow out through two delivery holes 141 of the second axial channel 14, achieving a first-stage circumferential dispersion. The liquid flowing out of each delivery hole 141 is dispersed into two streams of different sizes, which are ejected through a first ejection hole 151 and a second ejection hole 152, achieving a second-stage circumferential dispersion. Furthermore, in the second-stage circumferential dispersion, the larger stream of liquid is ejected from the larger outer first ejection hole 151, allowing for further outward dispersion along the circumference and effectively increasing the fan-shaped dispersion area. The smaller stream of liquid is ejected from the smaller inner second ejection hole 152, allowing for filling and dispersion in the central area of ​​the fan shape, reducing the blind zone of the liquid fan-shaped dispersion and improving the uniformity of the liquid fan-shaped dispersion.

[0039] In addition, this application embodiment also provides a motor, which includes a motor housing and any of the motor stators provided in this application embodiment. The annular iron core 1 is installed in the motor housing in a horizontal direction, and the first arc segment 1a is located directly above the second arc segment 1b. On the one hand, the amount of cooling oil distributed and sprayed by the spray nozzle 121 of the first arc segment 1a is relatively large, while the amount of cooling oil distributed and sprayed by the spray nozzle 121 of the second arc segment 1b is relatively small. That is, more cooling oil is sprayed onto the top of the stator winding 2, and less cooling oil is sprayed onto the bottom of the stator winding 2. On the other hand, under the action of gravity, the cooling oil above the stator winding 2 automatically flows down to cover the bottom of the stator winding 2, thereby reducing the amount of cooling oil above the stator winding 2 and increasing the amount of cooling oil below the stator winding 2. This allows the cooling oil to evenly cover the entire circumference of the stator winding 2, achieving uniform cooling of the motor stator. Therefore, regardless of where the oil inlet is located in the annular core 1, the cooling oil flowing into the stator core can be redistributed, thereby improving the uniformity of motor stator cooling.

[0040] Specifically, a first positioning structure (e.g., a positioning groove) can be provided on the annular iron core 1, and a second positioning structure (e.g., a positioning protrusion) can be provided on the motor assembly fixture or the motor housing. The first positioning structure and the second positioning structure cooperate with each other to ensure that the motor stator can be installed into the motor housing with the first arc segment 1a facing upward and the second arc segment 1b facing downward, so as to prevent the motor stator from being installed in the wrong orientation, which would make it difficult for the motor to achieve the expected cooling effect.

[0041] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A motor stator, characterized in that, include: An annular iron core is provided with an annular oil channel. At least one end of the annular iron core is a spray end, and the spray end is provided with a plurality of spray nozzles, each of which is connected to the annular oil channel. The annular core includes a first arc segment and a second arc segment along the circumferential direction, and the first arc segment and the second arc segment are arranged opposite to each other along the radial direction of the annular core; At the spray end, the first arc segment and the second arc segment each include at least one spray nozzle, and the spray nozzle of the first arc segment is larger than the spray nozzle of the second arc segment.

2. The motor stator according to claim 1, characterized in that, At the spray end, along the circumferential direction from the center of the second arc segment to the center of the first arc segment, each spray nozzle gradually increases in size.

3. The motor stator according to claim 1, characterized in that, At the spray end, the spray angle of the spray nozzle in the first arc segment is greater than the spray angle of the spray nozzle in the second arc segment.

4. The motor stator according to claim 1, characterized in that, At the spray end, along the circumferential direction from the center of the second arc segment to the center of the first arc segment, the spray angle of each spray nozzle gradually increases.

5. The motor stator according to claim 1, characterized in that, At the spray end, along the direction from the center of the second arc segment to the center of the first arc segment, each spray nozzle gradually moves away from the axis of the annular iron core.

6. The motor stator according to any one of claims 1-5, characterized in that, Between the annular oil passage and the spray nozzle, the annular core is provided with a first axial channel, a second axial channel and a third axial channel connected in sequence. The first axial channel, the second axial channel and the third axial channel form a stepped structure that gradually approaches the axis of the annular core. The outlet of the third axial channel forms the spray nozzle.

7. The motor stator according to claim 6, characterized in that, Along the circumferential direction from the center of the second arc segment to the center of the first arc segment, each of the third axial channels gradually moves away from the axis of the annular core.

8. The motor stator according to claim 7, characterized in that, Along the circumferential direction from the center of the second arc segment to the center of the first arc segment, each of the second axial channels gradually moves away from the axis of the annular core.

9. The motor stator according to claim 6, characterized in that, The second axial channel includes two conveying holes, which are arranged circumferentially along the annular core; The third axial channel includes two first exit holes and two second exit holes, each of which is arranged circumferentially along the annular core. The second exit holes are smaller than the first exit holes, and the two second exit holes are sandwiched between the two first exit holes.

10. An electric motor, characterized in that, The device includes a motor housing and a motor stator as described in any one of claims 1-9, wherein the annular iron core is installed in the motor housing in a horizontal direction, and the first arc segment is located directly above the second arc segment.

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