Stator core, stator assembly and motor

Abstract

The utility model relates to a stator core, a stator assembly and a motor. The whole peripheral surface of a stator yoke part of the stator core is provided with a plurality of inlet grooves which are in fluid communication with one another and a plurality of turbulent flow structures, so that a cooling medium can continuously flow on the peripheral surface through the plurality of inlet grooves; the stator core is provided with a plurality of cooling channels at intervals, and each cooling channel comprises at least one inlet channel and at least one flow channel; each inlet channel is communicated with the inlet groove and extends in the stator yoke part, and each flow channel is formed in the stator iron core and extends into the stator tooth part; each axial end portion of the stator core is provided with a plurality of outlet channels at intervals, and each outlet channel extends in the stator yoke portion and is communicated with the corresponding cooling passage. According to the stator iron core of the utility model, the winding parts inside and at the end part of the stator iron core and the stator iron core can be cooled at the same time, and various heat dissipation problems faced by a motor are effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially is related to a kind of stator core, the stator assembly comprising the stator core and the motor comprising the stator core or stator assembly. BACKGROUND

[0002] In the field of new energy vehicles, motor is one of the core components of power system and is widely used in various actuators to provide the power required to realize the corresponding functions, and its basic principle is to convert electrical energy into mechanical energy by using electromagnetic induction principle.

[0003] Motor mainly includes stator and rotor, wherein the stator can include stator core and stator winding, and the rotor can include rotor shaft, rotor core and rotor winding (or permanent magnet). When current passes through the stator winding, a rotating magnetic field is generated in the stator core, which induces a rotor magnetic field in the rotor winding and further rotates the rotor assembly, thereby converting electrical energy into mechanical energy. A large amount of heat is generated during the operation of the motor, so effective cooling of the various components of the motor, including the stator core, stator winding, etc., is particularly important.

[0004] Various schemes for cooling motor, especially stator core and stator winding, by oil cooling method are known in the prior art. For example, it is known that a scheme is to cool the outer periphery of the stator and the end portion of the winding by introducing oil in the axial middle of the stator core and discharging oil from both ends, wherein a stepped inclined oil spray channel is formed by introducing a group of through holes to achieve direct spray cooling of the end portion of the winding. However, the cooling effect of this cooling scheme on the winding inside the stator core is not obvious. In addition, other cooling schemes are also known, which obtain oil channels inside the stator core by conventional punching and stacking of lamination plates in a staggered manner, thereby allowing the cooling oil to cool the winding inside the stator core. However, these schemes lack effective cooling of the outer surface of the stator core, and these schemes involve complex lamination structures and have high material cost due to the use of a large amount of material for the outer diameter of the core.

[0005] Therefore, it is necessary to propose an improved stator core to overcome at least one of the above problems and / or other problems in the prior art. SUMMARY

[0006] To achieve the above object, according to one aspect of the present application, a kind of stator core is provided, the stator core includes stator yoke and the multiple stator tooth portion of the inner periphery of the stator yoke extends radially inward;Wherein, the stator yoke is provided with multiple inlet slots on its entire outer peripheral surface, which are in fluid communication with each other, and cooling medium can be introduced into at least one of the multiple inlet slots;Multiple flow disturbance structures are also provided on the outer peripheral surface of the stator yoke for changing the flow direction of the cooling medium, so that the introduced cooling medium can form continuous flow on the outer peripheral surface through the multiple inlet slots in fluid communication with each other;The stator core is spaced apart in the circumferential direction and is provided with multiple cooling channels, wherein each cooling channel includes at least one inlet channel and at least one flow channel that are connected to each other and in communication with each other in the axial direction;Each inlet channel has an inlet hole in communication with the inlet slot and extends within the stator yoke, and each flow channel is formed within the stator core and extends in the radial direction of the stator core and extends into the stator tooth portion;Multiple outlet channels are spaced apart in the circumferential direction at each axial end of the stator core, respectively, each outlet channel extends within the stator yoke and is in communication with the corresponding cooling channel.

[0007] According to an embodiment of the present application, the stator core is formed by two types of laminations stacked together.

[0008] According to an embodiment of the present application, the stator core includes multiple first lamination groups formed by first type laminations arranged in layers and two second lamination groups formed by second type laminations stacked on both axial sides of the multiple first lamination groups, the outer diameter of the second lamination group is greater than the outer diameter of the first lamination group;Wherein, the inlet slot and the cooling channel are formed in the multiple first lamination groups, and the outlet channel is formed in the second lamination group.

[0009] According to an embodiment of the present application, each of the first lamination groups is arranged with multiple first flow segments and multiple second flow segments at equal intervals, and each two adjacent first lamination groups in the multiple first lamination groups are stacked with a rotation angle, so that the first flow segment and the second flow segment aligned in the axial direction and connected to each other in each first lamination group together constitute the cooling channel, wherein the first flow segment constitutes the inlet channel, and the second flow segment constitutes the flow channel.

[0010] According to an embodiment of the present application, the number of the outlet channels formed in the second lamination stack satisfies the following formula: p=N / m, wherein p is the number of the outlet channels, N is the number of the teeth and slots of the stator core, and m is a positive integer; the rotation angle between every two adjacent first lamination stacks satisfies the following formula: a=n*360° / p, wherein a is the rotation angle, n is a positive integer, and p is the number of the outlet channels.

[0011] According to an embodiment of the present application, the plurality of cooling channels formed in the stator core have a plurality of different structural forms, and the positions and / or numbers of the inlet holes of the cooling channels of the different structural forms are varied.

[0012] According to an embodiment of the present application, the two first lamination stacks located at the end sides are at the same angular position and are set as reference lamination stacks, the first lamination stack located at the center position is set as a center lamination stack, and every two adjacent first lamination stacks between each reference lamination stack and the center lamination stack are misaligned and stacked according to the rotation angle.

[0013] According to an embodiment of the present application, the outer periphery of the first lamination stack is provided with a plurality of protrusions and recesses formed between every two adjacent protrusions, wherein the recesses at least partially define the inlet slots, and at least part of the plurality of protrusions constitute the spoiler structure.

[0014] According to an embodiment of the present application, a first notch is arranged on the bottom surface of at least part of the recesses, and a second notch is arranged on the top surface of at least part of the protrusions, wherein, in the stator core formed by stacking the plurality of first lamination stacks and the two second lamination stacks, the first notches in each first lamination stack which are aligned in the axial direction and connected to each other form a first welding slot for welding all the first lamination stacks, and the second notches formed in the first lamination stacks located at the end sides and the third notches formed in the corresponding second lamination stacks jointly form a second welding slot for welding the first lamination stacks located at the end sides and the corresponding second lamination stacks.

[0015] According to an embodiment of the present application, each first lamination stack is provided with an identification slot for identifying the rotation angle of misaligned stacking of two adjacent first lamination stacks when the plurality of first lamination stacks are stacked.

[0016] According to an embodiment of the present application, the first type of lamination includes a first outer peripheral section in the shape of a ring and a plurality of first tooth sections extending radially inward from the inner periphery of the first outer peripheral section, the first type of lamination is provided with a plurality of inflow holes and a plurality of passage holes distributed at equal intervals, the inflow holes are provided on the first outer peripheral section and recessed radially inward from the outer peripheral edge of the first outer peripheral section, the passage holes extend radially inward from the first outer peripheral section and extend into the first tooth sections, whereby when a plurality of first type of laminations are stacked, the first flow section is formed by the stacked inflow holes and the second flow section is formed by the stacked passage holes.

[0017] According to an embodiment of the present application, the second type of lamination includes a second outer peripheral section in the shape of a ring and a plurality of second tooth sections extending radially inward from the inner periphery of the second outer peripheral section, the outer diameter of the second outer peripheral section is greater than the outer diameter of the first outer peripheral section; the second outer peripheral section is provided with a plurality of outflow holes distributed at equal intervals, whereby when a plurality of second type of laminations are stacked, the outlet passage is formed by the stacked outflow holes.

[0018] According to another aspect of the present application, a stator assembly is provided, which includes a stator winding and a stator core as described above.

[0019] According to still another aspect of the present application, an electric machine is provided, which includes a stator core or a stator assembly as described above.

[0020] With the stator core according to the present application, the cooling medium flows into the interior of the core while continuously flowing on the surface of the core, and forms a continuous flow channel in the interior of the core, especially near the wire slot, so that the cooling medium can flow in the interior of the core in close proximity to the winding, achieving continuous cooling of the outer surface of the stator core and effective cooling of the winding portion in the interior of the stator core; the final cooling medium is sprayed to the end winding through the outlet passage at the end portion, effectively reducing the temperature of the end winding, solving various heat dissipation problems of the electric machine, and improving the overall performance of the electric machine. In addition, the laminations constituting the stator core according to the present application only involve two types of laminations and do not involve complex special structures, reducing the manufacturing cost of the stator core. BRIEF DESCRIPTION OF DRAWINGS

[0021] The features and advantages of the present application will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings provided only by way of illustration, and thus, are not to be considered limiting of the present application, in which:

[0022] Figure 1 A perspective view of a stator assembly according to one embodiment of the present application is shown.

[0023] Figure 2 a perspective view of a stator core of the stator assembly is shown. Figure 1 a perspective view of a stator core of the stator assembly is shown.

[0024] Figure 3 a perspective view of a stator core of the stator assembly is shown. Figure 2 a front view of the stator core is shown.

[0025] Figure 4 a perspective view of a stator core of the stator assembly is shown. Figure 3 a sectional view of the stator core shown along the line A-A is shown.

[0026] Figure 5 a perspective view of a stator core of the stator assembly is shown. Figure 3 a sectional view of the stator core shown along the line B-B is shown.

[0027] Figure 6 a perspective view of a stator core of the stator assembly is shown. Figure 3 a sectional view of the stator core shown along the line C-C is shown.

[0028] Figure 7 a perspective view of a stator core of the stator assembly is shown. Figure 2 a perspective view of a first lamination stack of the stator core is shown.

[0029] Figure 8 a schematic view of a first type of lamination of the first lamination stack is shown. Figure 7 a schematic view of a first type of lamination of the first lamination stack is shown.

[0030] Figure 9 a schematic view of a second type of lamination of the second lamination stack of the stator core is shown. Figure 2 a schematic view of a second type of lamination of the second lamination stack of the stator core is shown. DETAILED DESCRIPTION

[0031] Embodiments of the present application are described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art, that the present application can be practiced without some or all of these specific details. In other instances, well known process steps and / or structures have not been described in detail in order to not unnecessarily obscure the present application. It will be understood that the present application is not limited to the particular embodiments described herein. Rather, the scope of the present application includes any combination of the various features and elements described below without regard to the particular embodiment to which they are described.

[0032] In the following, terms such as "first", "second" and the like are used to describe elements of the present application, and these terms are only used to distinguish one element from another, rather than to limit the nature, order or number of these elements. The terms "include" and "have" are used to mean an open-ended inclusion, and refer to the presence of additional elements / components in addition to the listed elements / components.

[0033] Figure 1 A stator assembly according to an embodiment of the present application is shown, which can include a stator core 100 and a stator winding 200. Figure 2 and Figure 3 The stator core 100 of the stator assembly of the present embodiment is shown. As shown, Figures 1-3 The stator core 100 according to the embodiment of the present application can include a stator yoke 1 and a plurality of stator tooth portions 2. The plurality of stator tooth portions 2 extend radially inward at equal intervals along the inner periphery of the stator yoke 1, thereby forming stator slots between adjacent two stator tooth portions 2. The stator winding is generally composed of winding coils and insulating materials, the winding coils are made of conductive material and are wound in the stator slots, generating a magnetic field when the motor is running, causing the rotor of the motor to generate a rotational torque. At the same time, the stator winding also plays a role in transmitting electrical energy and conducting heat, ensuring the stable operation of the motor. Therefore, the overall cooling of the stator winding is very important.

[0034] In the prior art, a cooling oil passage is usually formed in the stator yoke of the stator core, and oil outlet holes are formed on both axial sides of the stator core by means of lamination misalignment or adding additional components (such as oil injection rings). This scheme has obvious cooling effect on the part of the stator winding exposed to the two end portions of the stator core, but the cooling effect on the part of the stator winding located inside the stator core is not good. The cooling passage in the stator core of the present embodiment can extend into the stator tooth portions 2 thereof, so that the cooling medium can flow between adjacent two stator slots and as close as possible to the part of the stator winding located inside the stator core, thereby being able to cool the entire stator winding part located inside and at the end of the stator core, effectively solving various heat dissipation problems faced by the motor when working under high load and high power density, while improving the overall performance of the motor, including efficiency, power density, service life and performance stability. The stator core 100 of the present embodiment will be described in detail below.

[0035] As Figure 2 and Figure 3As shown, the stator yoke portion 1 is provided with a plurality of inlet grooves 3 and a plurality of turbulence structures on its entire outer circumferential surface. A cooling medium (such as cooling oil) can be introduced into at least one of the plurality of inlet grooves 3, for example, from a cooling pipe on the housing. The plurality of inlet grooves 3 are in fluid communication with each other and the flow direction of the cooling medium on the outer circumferential surface of the stator yoke portion 1 can be changed by the plurality of turbulence structures, so that the cooling medium can form a continuous flow in the axial and circumferential directions of the stator yoke portion 1 to constantly contact the surface of the core. These turbulence structures can also slow down the flow speed of the cooling medium.

[0036] Continuing to refer to Figure 2 , the stator core is provided with a plurality of cooling passages 4 spaced apart in the circumferential direction. Each cooling passage 4 extends generally in the axial direction of the stator core and includes various different structural forms as shown in Figures 4-6 . Specifically, each cooling passage can include at least one inlet channel 41 and at least one flow channel 42 connected to and in communication with each other in the axial direction. Depending on the circumferential position of the cooling passage 4, the number and arrangement of the inlet channels 41 and flow channels 42 constituting the cooling passage are different. As shown in Figures 4-6 , the inlet channel 41 extends within the stator yoke portion 1 and has an inlet hole in communication with the inlet groove 3. Each flow channel 42 is formed within the stator core and extends into the stator tooth portion 2 from the stator yoke portion 1 in the radial direction of the stator core. The stator core has two axial end portions, each of which is spaced apart in the circumferential direction by a plurality of outlet channels 5, and each of which can be in communication with the inlet channel 41 or the flow channel 42 of the corresponding cooling passage 4 on the end side.

[0037] Specifically, as shown in Figure 4 , the cooling passage includes two inlet channels 41 (and thus two inlet holes) and three flow channels 42. After entering from the two inlet holes, the cooling medium flows to the flow channels 42 and finally flows out through the outlet channel 5 via the flow channel 42 on the end side. As shown in Figure 5 , the cooling passage includes three inlet channels 41 (and thus three inlet holes) and two flow channels 42. After entering from the three inlet holes, the cooling medium flows to the flow channels 42 and finally flows out through the outlet channel 5 via the inlet channel 41 on the end side. As shown in Figure 6 , the cooling passage includes two inlet channels 41 (and thus two inlet holes) and three flow channels 42. After entering from the two inlet holes, the cooling medium flows to the flow channels 42 and finally flows out through the outlet channel 5 via the flow channel 42 on the end side.

[0038] The stator core according to the present embodiment can be formed by stacking together two types of laminations. Referring to Figure 2 , Figures 7-9As shown, the stator core can include a plurality of first lamination sets 6 and two second lamination sets 7 arranged in a stack. The first lamination sets 6 and the second lamination sets 7 are respectively stacked by different types of laminations, wherein the outer diameter of the second lamination sets 7 is greater than that of the first lamination sets 6, so that when the two second lamination sets 7 are stacked on the axial sides of the plurality of first lamination sets 6, the second lamination sets 7 can form a stop edge at both ends of the stator core, so that the cooling medium flowing into the inlet slot 3 on the outer periphery of the plurality of first lamination sets 6 can continuously flow on the outer peripheral surface of the stator core, avoiding direct leakage from the end of the stator core. The inlet passage 41 and the flow passage 42 of the cooling passage 4 are formed in the plurality of first lamination sets 6, and the outlet passage 5 is formed in the second lamination sets 7.

[0039] According to the first lamination set 6 of the present embodiment, referring to Figure 7 As shown, each first lamination set 6 is arranged with a plurality of first flow sections 61 and a plurality of second flow sections 62 at equal intervals. The first flow sections 61 of the first lamination set 6 constitute the inlet passage 41, and the second flow sections 62 constitute the flow passage 42, so that when each two adjacent first lamination sets 6 in the plurality of first lamination sets 6 are stacked with a rotational angle, the first flow sections 61 and the second flow sections 62 in each first lamination set 6 that are aligned in the axial direction and connected to each other can collectively constitute a cooling passage 4. For different numbers of stacked first lamination sets 6 and second lamination sets 7, the number of first flow sections 61 and second flow sections 62 on the first lamination set 6 can be set as needed, for example Figure 7 The first lamination set 6 shown is provided with nine first flow sections 61 at equal intervals, and two second flow sections 62 at equal intervals between adjacent two first flow sections 61.

[0040] In the present embodiment, the number of outlet passages 5 formed in the second lamination set 7 satisfies the formula: p=N / m, where p is the number of the outlet passages 5, N is the number of slots of the stator core, and m is a positive integer. Thus, each outlet passage 5 can be arranged at a position of the stator yoke portion 1 corresponding to each adjacent m stator teeth portion 2. For example, in the present embodiment, the number of stator teeth portions 2 is 54, and m is 2, so the number of p is 27, and thus one outlet passage 5 can be arranged in the stator yoke portion at a position of the stator teeth portion 2 between every two adjacent stator slots, as shown in Figure 2 and Figure 3 As shown.

[0041] Accordingly, the rotation angle between each two adjacent first lamination sets 6 satisfies the following formula: a = n x 360° / p, where a is the rotation angle, n is a positive integer, and p is the number of outlet channels 5. In this way, each first flow section 61 and second flow section 62 (corresponding to the respective inlet channel 41 and flow channel 42, respectively) on each first lamination set 6 adjacent to the second lamination set 7 can correspond to one outlet channel 5. For example, as shown in Figure 3 and Figure 7 When n is 1 and the number of outlet channels 5 is 27, the rotation angle a = 1 x 360° / 27 = 13.33°, and when the second lamination set 7 is arranged with 27 outlet channels 5, each outlet channel 5 can correspond to one inlet channel 41 or flow channel 42. It should be noted that the value of n should avoid the case that the adjacent two first lamination sets 6 are completely overlapped after the rotation angle a.

[0042] According to the different rotation angles of the plurality of first lamination sets 6 and the different numbers of first flow sections 61 and second flow sections 62 provided thereby, the structure of the cooling passage 4 (including the position of the inlet hole of the inlet channel 41, the number of inlet channels 41, and the number of flow channels 42, etc.) is different.

[0043] Specifically, the stator core of the present embodiment can include a plurality of, for example, seven first lamination sets 6 and two second lamination sets 7, each first lamination set 6 is provided with nine first flow sections 61 at equal intervals, and two second flow sections 62 are provided at equal intervals between each adjacent two first flow sections 61. In the following, for the convenience of description, the positions where the A-A, B-B, and C-C cross-sectional lines in Figure 3 are located are referred to as angular positions. The first lamination sets 6 located at the end sides and close to the two second lamination sets 7 are at the same angular position (i.e., there is no rotation misplacement between the two first lamination sets) and are set as reference lamination sets, and the first lamination sets 6 located at the middle position are set as a center lamination set, so that each adjacent two first lamination sets 6 between the reference lamination set and the center lamination set are misplaced according to the rotation angle a. According to an advantageous embodiment, each first lamination set 6 can also be provided with an identification slot 65 (see Figure 7 ). The identification slot 65 is provided on each first lamination set 6 only one, which is used to identify the rotation angle of the misplacement of the adjacent two first lamination sets 6 when the plurality of first lamination sets 6 are stacked.

[0044] Continuing to refer to Figure 7The outer circumferential surface of the first lamination stack 6 is provided with a plurality of protrusions 63 and recesses 64 formed between adjacent two protrusions 63. The recesses 64 at least partially define the inlet grooves 3, and at least part of the plurality of protrusions 63 constitute the spoiler structure, so that the cooling medium can flow along the axial direction of the stator core after entering at least one of the inlet grooves 3, and the flow direction of the cooling medium is changed in the circumferential direction by the spoiler structure.

[0045] Optionally, a first notch 641 is provided on the bottom surface of at least part of the recesses 64, so that when the plurality of first lamination stacks 6 are stacked with a rotation angle, the first notches 641 on the same angular position of the plurality of first lamination stacks 6 are aligned in the axial direction and connected to each other to form a first welding groove 10 (see Figure 2 ). The first welding groove 10 can be used to weld the plurality of first lamination stacks 6 into one whole. A second notch 631 is provided on the top surface of at least part of the protrusions 63, and the outer circumferential surface of the second lamination stack 7 is provided with a third notch, so that when the second lamination stack 7 is stacked at the axial end of the plurality of first lamination stacks 6, the third notch of the second lamination stack 7 is aligned in the axial direction with the second notches 631 on the same angular position and connected to each other to form a second welding groove 11 (see Figure 2 ), for welding the second lamination stack 7 to the axial end of the plurality of first lamination stacks 6.

[0046] According to an embodiment of the first lamination stack 6 and the second lamination stack 7, as shown in Figure 7 and Figure 8 , the first lamination stack 6 is formed by stacking a plurality of first type laminations 8, and the second lamination stack 7 is formed by stacking a plurality of second type laminations 9.

[0047] Specifically, referring to Figure 8 , the first type lamination 8 can include a first circumferential section 81 and a plurality of first tooth sections 82. The first circumferential section 81 is annular, and the plurality of first tooth sections 82 are arranged equidistantly along the circumferential direction of the first circumferential section 81 and extend radially inward from the inner circumferential surface of the first circumferential section 81. The first type lamination 8 is equidistantly provided with a plurality of flow in holes 83 and a plurality of passage holes 84 between adjacent two flow in holes 83. The flow in hole 83 is provided on the first circumferential section 81 and recessed radially inward from the outer circumferential edge of the first circumferential section 81, and the passage hole 84 extends radially inward from the inside of the first circumferential section 81 and extends into the first tooth section 82. Thus, when the plurality of first type laminations 8 are stacked to form the first lamination stack 6, the stacked flow in holes 83 constitute the first flow section 61 of the first lamination stack 6 as shown in Figure 7 , and the stacked passage holes 84 constitute the first passage section 62 of the first lamination stack 6 as shown in Figure 7The second flow section 62 of the first lamination stack 6 is shown. Various protrusions and recesses are provided on the outer peripheral edge of the first outer peripheral section 81, which can be stacked to form the first lamination stack 6 when a plurality of first type laminations 8 are stacked. Figure 7 The protrusion 63, the second recess 631, the recess 64, the first recess 641, etc. in the first lamination stack 6 are shown.

[0048] Reference is made to Figure 9 As shown, the second type lamination 9 can include a second outer peripheral section 91 and a plurality of second tooth sections 92. The second outer peripheral section 91 is annular, and its outer diameter is greater than that of the first outer peripheral section 81. The plurality of second tooth sections 92 are equidistantly arranged along the circumference of the second outer peripheral section 91 and extend radially inwardly from the inner periphery of the second outer peripheral section 91. The second outer peripheral section 91 is provided with a plurality of outflow holes 93 equidistantly distributed, so that when a plurality of second type laminations 9 are stacked to form the second lamination stack 7, the stacked outflow holes 93 form the third recesses in the second lamination stack 7 as described above. Figures 1-3 The outlet passage 5 is shown. The recesses are provided on the outer peripheral edge of the second outer peripheral section 91, which can be stacked to form the third recesses in the second lamination stack 7 when a plurality of second type laminations 9 are stacked to form the second lamination stack 7.

[0049] The utility model also provides a kind of stator assembly comprising stator winding 200 and above-mentioned stator core 100, and a kind of motor comprising above-mentioned stator core or stator assembly.

[0050] As described above, the entire outer peripheral surface of the stator core according to the utility model is provided with a plurality of inlet grooves 3 in communication with each other, and the flow direction of the cooling medium is changed via the turbulence structure, so that the cooling medium can flow continuously along the circumferential direction and the axial direction on the outer peripheral surface of the stator core. The inlet passage 41 is in communication with the inlet groove 3 via the inlet hole, so that the cooling medium can flow in the flow channel 42 inside the stator core via the inlet passage 41. And the flow channel 42 extends into the stator tooth portion 2, so that the cooling medium can be closer to the stator winding inside the stator slot arranged on both sides of the stator tooth portion 2. And a plurality of outlet passages 5 are arranged axially at intervals on both axial ends of the stator core, so that the cooling medium can flow to the end portion of the stator winding extending out of the stator core through the outlet passage 5. Therefore, through the stator core of the present embodiment, the cooling of the entire stator winding and the stator core can be realized at the same time, effectively solving the various heat dissipation problems faced by the motor when working under high load and high power density, and improving the overall performance of the motor, including efficiency, power density, service life and performance stability.

[0051] Various modifications and changes can be made to the embodiments disclosed in the foregoing without departing from the scope or spirit of the present application. Other embodiments of the present application will be apparent to those of ordinary skill in the art from the disclosure of this specification. It is contemplated that the application disclosed in this specification and its equivalents can be practiced without specific reference to the above examples. It is intended to include all such variations and modifications within the scope of the present application. The specification and examples given should be considered exemplary only, with the true scope of the application being indicated by the following claims.

Claims

1. A stator core characterized by, The stator core comprises a stator yoke (1) and a plurality of stator tooth portions (2) extending radially inwardly at the inner periphery of the stator yoke; The stator yoke is provided with a plurality of inlet grooves (3) in fluid communication with each other on the entire outer periphery surface thereof, and a cooling medium can be introduced into at least one of the plurality of inlet grooves (3); the stator yoke is further provided with a plurality of turbulence structures on the outer periphery surface thereof for changing the flow direction of the cooling medium, so that the introduced cooling medium can form a continuous flow on the outer periphery surface through the plurality of inlet grooves in fluid communication with each other; The stator core is provided with a plurality of cooling channels (4) spaced apart in the circumferential direction, wherein each cooling channel comprises at least one inlet passage (41) and at least one flow passage (42) connected to each other in the axial direction; each inlet passage has an inlet hole in communication with the inlet groove (3) and extends within the stator yoke (1), and each flow passage is formed within the stator core and extends in the radial direction of the stator core and into the stator tooth portion (2); A plurality of outlet passages (5) are spaced apart in the circumferential direction at each axial end of the stator core, respectively, and each outlet passage extends within the stator yoke (1) and communicates with the corresponding cooling channel (4).

2. The stator core according to claim 1, characterized by The stator core is formed by the common stacking of two types of laminations.

3. The stator core of claim 2, characterized by The stator core comprises a plurality of first lamination groups (6) formed by first type laminations (8) arranged in layers and two second lamination groups (7) formed by second type laminations (9) stacked on the axial both sides of the plurality of first lamination groups, the outer diameter of the second lamination groups (7) is greater than the outer diameter of the first lamination groups (6); wherein the inlet grooves (3) and the cooling channels (4) are formed in the plurality of first lamination groups (6), and the outlet passages (5) are formed in the second lamination groups (7).

4. The stator core of claim 3, characterized by Each of the first lamination groups (6) is arranged with a plurality of first flow segments (61) and a plurality of second flow segments (62) at equal intervals, and each two adjacent first lamination groups in the plurality of first lamination groups are stacked with a rotation angle, so that the first flow segments and the second flow segments aligned in the axial direction and connected to each other in each first lamination group together constitute the cooling channel (4), wherein the first flow segments (61) constitute the inlet passage (41), and the second flow segments (62) constitute the flow passage (42).

5. The stator core of claim 4, characterized by The number of outlet passages (5) formed in the second lamination groups (7) satisfies the formula: p=N / m, where p is the number of outlet passages (5), N is the number of teeth and slots of the stator core, and m is a positive integer; the rotation angle between each two adjacent first lamination groups satisfies the formula: α=n×360° / p, where α is the rotation angle, n is a positive integer, and p is the number of outlet passages (5).

6. The stator core of claim 4, characterized by The plurality of cooling channels (4) formed in the stator core have a plurality of different structural forms, and the position and / or number of inlet holes of the cooling channels of various structural forms are varied.

7. The stator core of claim 5, characterized by The two first lamination stacks located at the end side are in the same angular position and are set as reference lamination stacks, the first lamination stack located at the center position is set as a center lamination stack, and every two adjacent first lamination stacks between each reference lamination stack and the center lamination stack are arranged in a staggered manner according to the rotation angle.

8. The stator core according to any one of claims 3 to 7, characterized by The outer periphery of the first lamination stack (6) is provided with a plurality of protrusions (63) and recesses (64) formed between every two adjacent protrusions, wherein the recesses at least partially define the inlet slot (3), and at least part of the plurality of protrusions constitute the spoiler structure.

9. The stator core of claim 8, characterized by A first notch (641) is arranged on the bottom surface of at least part of the recess (64), and a second notch (631) is arranged on the top surface of at least part of the protrusion (63), wherein in the stator core formed by the plurality of first lamination stacks and the two second lamination stacks, the first notches (641) in each first lamination stack that are aligned in the axial direction and continuous with each other form a first welding slot (10) for welding all the first lamination stacks; the second notches (631) formed in the first lamination stacks located at the end side and the third notches formed in the corresponding second lamination stacks jointly form a second welding slot (11) for welding the first lamination stacks located at the end side and the corresponding second lamination stacks.

10. The stator core of any one of claims 4 to 7, characterized by Each of the first lamination stacks (6) is provided with an identification slot (65) for identifying the rotation angle of the staggered arrangement of two adjacent first lamination stacks when the plurality of first lamination stacks are stacked.

11. The stator core according to any one of claims 4 to 7, characterized by The first type of lamination (8) includes a first outer peripheral segment (81) in the form of a ring and a plurality of first tooth segments (82) extending radially inward from the inner periphery of the first outer peripheral segment, and the first type of lamination (8) is provided with a plurality of inlet flow holes (83) and a plurality of passage holes (84) arranged at equal intervals, the inlet flow holes (83) being arranged on the first outer peripheral segment (81) and recessed radially inward from the outer peripheral edge of the first outer peripheral segment, and the passage holes (84) extending radially inward from the inside of the first outer peripheral segment (81) and extending into the first tooth segments (82), so that when a plurality of first type laminations (8) are stacked, the first flow segments (61) are formed by the stacked inlet flow holes (83), and the second flow segments (62) are formed by the stacked passage holes (84).

12. The stator core of claim 11, characterized by The second type of lamination (9) includes a second outer peripheral segment (91) in the form of a ring and a plurality of second tooth segments (92) extending radially inward from the inner periphery of the second outer peripheral segment, and the outer diameter of the second outer peripheral segment (91) is greater than the outer diameter of the first outer peripheral segment (81); the second outer peripheral segment (91) is provided with a plurality of outlet flow holes (93) arranged at equal intervals, so that when a plurality of second type laminations (9) are stacked, the outlet passage (5) is formed by the stacked outlet flow holes (93).

13. A stator assembly characterized by, The stator assembly includes a stator winding and a stator core according to any one of claims 1 to 12.

14. An electric machine characterized by The motor includes a stator core according to any one of claims 1 to 12 or a stator assembly according to claim 13.

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