Stator core and motor

Abstract

The invention provides a stator iron core and a motor, and the iron core comprises a first stacked body which is composed of first punching sheets, a yoke part of the first stacked body is provided with a first groove, the bottom of a stator groove at the interval of one stator groove is provided with a second groove at the two sides of the first groove, and the second groove is communicated with the stator groove and deviates towards the direction of the first groove; the second stacking body is composed of second punching sheets, a plurality of third grooves are formed in the outer circumference of the second stacking body, a plurality of fourth grooves are formed in the yoke part of the second stacking body, the third grooves and the fourth grooves are spaced by a tooth part, and the third grooves of part of the second punching sheets are partially overlapped with the fourth grooves of the other part of the second punching sheets; the first stacking bodies are arranged on the two sides of the second stacking body, at least two first stacking bodies are arranged on at least one side, the first grooves, close to the second stacking body, of the first stacking bodies are partially overlapped with the fourth grooves, and the first grooves and the second grooves between the first stacking bodies are partially overlapped. According to the invention, cooling oil rapidly takes away heat from the heat of the winding conductor in the groove, and efficient heat dissipation is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a stator core and a motor. Background Art

[0002] As a power component of new energy vehicles, the motor generates torque to drive the vehicle. The magnetic field generated by the stator winding of the new energy vehicle motor interacts with the rotor to generate torque. However, when the motor is working, the three-phase winding will generate a lot of heat, and the temperature of the winding and stator core will rise. Excessive temperature may damage the winding (generally copper wire with insulating paint film), insulating paper, and insulating paint, and the insulation performance of the motor will decrease. The originally designed insulation system may be damaged, and the motor is prone to failure. Moreover, the motor is a relatively closed system, and the heat will also be conducted to the rotor along the air gap of the motor. The increase in rotor temperature may cause the permanent magnet and bearing to fail, and the motor performance will decrease or even fail. If the temperature wall is set, the motor temperature will enter the protection state when it reaches a certain value, and the motor will cool naturally, and the continuous output performance of the motor will decrease. Therefore, the motor generally needs to actively dissipate heat to remove heat and improve its continuous output capacity.

[0003] At present, there are several common ways to dissipate heat in motor stators: shell water channel cooling, there is a cooling water channel on the motor mounting shell, the shell and the stator core are in contact, and the temperature difference is used to conduct heat to remove heat; stator core outer diameter oil channel cooling, compared with water channel cooling, the heat exchange medium is closer to the winding and the core, the two main heat sources, and the oil holes are designed on the outer diameter of the stator core, and the oil takes away the heat through the oil holes on the core; stator core oil channel cooling at the root of the tooth, compared with the outer diameter oil channel cooling, the oil channel design of this cooling method is closer to the root of the stator core tooth and closer to the winding, and the end crown winding is cooled by spraying, but this cooling method requires a variety of different stator punching design combinations and stacking to form oil channels, which is complex in design and high in cost. However, the main heat generated by the actual motor comes from the winding, and these heat dissipation structures cannot allow the cooling medium and the winding to directly contact and exchange heat, so the cooling effect is limited. Summary of the invention

[0004] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a stator core and a motor to solve the problem that the existing motor stator heat dissipation method cannot allow the cooling medium and the winding to directly contact and exchange heat, and the cooling effect is limited.

[0005] To achieve the above-mentioned object and other related objects, the present invention provides a stator core, comprising:

[0006] A first stack composed of first punching sheets, wherein a first groove and a second groove are provided on a yoke portion of the first punching sheet along a circumferential direction thereof, wherein the second groove is provided at the bottom of a stator slot spaced one stator slot apart on both sides of the first groove, wherein the second groove is communicated with the stator slot and deviates in the direction of the first groove;

[0007] A second stack composed of second punching sheets, wherein a plurality of third grooves are provided on the outer circumference of the second punching sheets along the circumference thereof, and a plurality of fourth grooves are provided on the yoke thereof, wherein the third grooves and the fourth grooves are arranged with a tooth portion in between, and in the second stack, the third grooves of a part of the second punching sheets partially overlap with the fourth grooves of another part of the second punching sheets;

[0008] The first stacking bodies are arranged on both sides of the second stacking body, and at least two first stacking bodies are arranged on at least one side, the first groove of the first stacking body close to the second stacking body partially overlaps with the fourth groove, and the first groove between multiple first stacking bodies partially overlaps with the second groove.

[0009] In a preferred embodiment of the present invention, two second grooves on both sides of the first groove are arranged symmetrically with respect to the first groove.

[0010] In a preferred embodiment of the present invention, the first groove is arranged along the radial direction of the stator core, and the second groove is arranged along the circumferential direction of the stator core or is arranged at an inclination with respect to the bottom of the stator slot.

[0011] In a preferred embodiment of the present invention, a plurality of the first stacked bodies located on one side of the second stacked bodies are rotated in sequence in a clockwise direction or a counterclockwise direction by a distance of at least one stator slot.

[0012] In a preferred embodiment of the present invention, the overlapping area of ​​the first groove and the second groove is greater than 1.2 mm 2 The overlapping area of ​​the fourth groove and the first groove is greater than 1.25mm 2 The overlapping area of ​​the third groove and the fourth groove is greater than 1.25 mm 2 .

[0013] In a preferred embodiment of the present invention, the outer diameter of the second stacked body is smaller than that of the first stacked body, an annular oil passage is formed between the first stacked body and the motor housing on both sides of the second stacked body, and the annular oil passage is connected to the third groove.

[0014] In a preferred embodiment of the present invention, the outer circumference of the first punching sheet is provided with welding grooves, and a plurality of the first stacking bodies are stacked to form stepped welding grooves arranged along the circumference thereof, and welded to form stepped welds.

[0015] In a preferred embodiment of the present invention, a plurality of outer diameter teeth are arranged on the outer circumference of the second punching sheet, the outer diameter of the outer diameter teeth is the same as the outer diameter of the first punching sheet, and a welding groove is arranged on the side of the outer diameter teeth away from the stator slot, and is arranged corresponding to the welding groove of the first stack body.

[0016] In a preferred embodiment of the present invention, the first groove, the third groove and the third groove are arranged corresponding to the tooth portions of the respective punching sheets.

[0017] The present invention further provides a motor, comprising: a rotor and a stator, wherein the stator is coaxially arranged around the outer circumference of the rotor, and the stator comprises a stator core as described in any one of the above embodiments.

[0018] The present invention proposes a stator core and a motor, which are designed to include a stacked body formed by two types of punching sheets, so that an oil channel is formed from the stator core to the circumference. The oil channel is formed by stacking the grooves on the punching sheets, so that cooling oil can enter each wire slot and directly contact the coil winding, thereby effectively reducing the temperature of the motor stator. The cooling oil quickly takes away the heat from the key heat-generating part, that is, the heat of the winding conductor in the slot, thereby achieving efficient heat dissipation.

[0019] The present invention proposes a stator core and a motor. By entering each wire slot from the middle of the outer circumference of the stator core and flowing to the two ends of the stator core, this design can maintain the temperature consistency of the two ends of the stator to the greatest extent, avoid the problem of uneven temperature field caused by excessive temperature difference between inlet and outlet oil temperatures due to excessive length and bending of the cooling oil channel, reduce the influence of thermal stress on the motor structure, improve the reliability and working stability of the motor, and the cooling strategy is easy to design and control.

[0020] The present invention provides a stator core and a motor, wherein cooling oil flows from the end surface of the core to the stator winding, effectively reducing the temperature of the end of the stator winding. The stator winding is the part of the motor that generates the most heat. By reducing the winding temperature, the continuous performance of the motor is improved and failures caused by excessive temperature are reduced.

[0021] The present invention proposes a stator core and a motor. The stator core has a simple structure and only needs to design two stator punching sheets for stacking. The stator cooling design provides important support for improving the cooling and heat dissipation capacity of the motor, improving continuous output performance, and improving reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0023] Figure 1 FIG. 4 is a schematic diagram of a stator core according to an embodiment of the present invention.

[0024] Figure 2 Schematic diagram of a first punching sheet in one embodiment of the present invention.

[0025] Figure 3 It is a partial schematic diagram of a first punching sheet in one embodiment of the present invention.

[0026] Figure 4 Schematic diagram of a second punching sheet in one embodiment of the present invention.

[0027] Figure 5 It is a partial schematic diagram of the second punching sheet in one embodiment of the present invention.

[0028] Figure 6 FIG. 4 is a schematic diagram of a first stacking body according to an embodiment of the present invention.

[0029] Figure 7 It is a partial schematic diagram of the first stacking body in one embodiment of the present invention; wherein a) is a rear axial schematic diagram of the first stacking body; b) is a rear axial schematic diagram of the second stacking body; c) is a rear axial schematic diagram of the third stacking body.

[0030] Figure 8 FIG. 4 is a schematic diagram of a second stacking body according to an embodiment of the present invention.

[0031] Fig. 9 FIG. 4 is a partial schematic diagram of the stacking of the second stacking body in one embodiment of the present invention.

[0032] Fig.10 Schematic diagram of stacking of a first stack and a second stack in one embodiment of the present invention; wherein a) is a forward schematic diagram; and b) is a reverse schematic diagram.

[0033] Fig.11 FIG. 1 is a schematic diagram of a weld of a stator core in one embodiment of the present invention.

[0034] Fig.12 FIG. 1 is a schematic diagram of a stator core without welds in one embodiment of the present invention.

[0035] Fig.13 It is a partial schematic diagram of the first punching sheet in another embodiment of the present invention.

[0036] Fig.14 It is a partial schematic diagram of the first punching sheet in yet another embodiment of the present invention.

[0037] Fig.15 Schematic diagram of oil channel cooling in one embodiment of the present invention.

[0038] Fig.16 It is a schematic diagram of a stepped oil channel formed by a stack in one embodiment of the present invention.

[0039] Fig.17 FIG. 1 is a schematic diagram of a motor according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0041] It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner. Therefore, the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0042] See also Figures 1 to 17 As shown, the present invention proposes a stator core and a motor, which are used to solve the problem that the existing motor stator heat dissipation method cannot allow the cooling medium and the winding to directly contact and exchange heat, and the cooling effect is limited. Specifically, the stator core 100 includes a first stacking body 10 and a second stacking body 20, the first stacking body 10 is composed of a first punching sheet 11, and the second stacking body 20 is composed of a second punching sheet 21. The first punching sheet 11 and the second punching sheet 21 are respectively provided with corresponding grooves, so that corresponding oil channels are formed when they are stacked to form a stacking body. The first stacking body 10 is arranged on both sides of the second stacking body 20, so that the cooling oil can enter each wire slot through the oil channel formed by the above-mentioned grooves and directly contact the coil winding.

[0043] See also Figure 1 , Figure 2 and Figure 3 , Figure 6 and Figure 7As shown, in this embodiment, along the circumference of the first punch 11, a first groove 111 and a second groove 112 are opened on the yoke 101 of the first punch 11, and a second groove 112 is opened at the bottom of the stator slot 102 separated by a stator slot 102 on both sides of the first groove 111. The second groove 112 is connected to the corresponding stator slot 102, and the second groove 112 is offset in the direction of the first groove 111, so that when a plurality of first stack bodies 10 are stacked, the first groove 111 and the second groove 112 partially overlap to form a connected oil path structure.

[0044] See also Figure 1 , Figure 4 and Figure 5 , Figure 8 and Fig. 9 As shown, in the present embodiment, a plurality of third grooves 211 are provided on the outer circumference of the second punch 21 along the circumference of the second punch 21, and a plurality of fourth grooves 212 are provided on the yoke 101 of the second punch 21. The third grooves 211 and the fourth grooves 212 are provided with a tooth portion 103 therebetween. When a plurality of second punches 21 are stacked to form a second stack body 20, the third grooves 211 of a portion of the second punches 21 and the fourth grooves 212 of another portion of the second punches 21 partially overlap to form an oil path connecting the third grooves 211 and the fourth grooves 212.

[0045] See also Figures 1 to 10 As shown, in the present embodiment, first stack bodies 10 are arranged on both sides of the second stack body 20, and at least two first stack bodies 10 are arranged on at least one side of the second stack body 20, wherein the first groove 111 of the first stack body 10 close to the second stack body 20 partially overlaps with the fourth groove 212 of the second stack body 20, and the first groove 111 and the second groove 112 between the plurality of first stack bodies 10 partially overlap, so that the cooling oil enters the fourth groove 212 from the third groove 211, and then flows from the fourth groove 212 into the first groove 111, and then flows from the first groove 111 into the second groove 112, and finally flows from the second groove 112 into the stator slot 102, directly contacts with the coil winding 110 in the stator slot 102, quickly takes away the heat of the winding conductor in the slot, and realizes efficient heat dissipation.

[0046] See also Figures 1 to 10 , Fig.15As shown, in this embodiment, the plurality of first stacks 10 located on one side of the second stack 20 are rotated in a clockwise or counterclockwise direction by a distance of at least one stator slot 102, so as to ensure that each stator slot 102 in the stator core 100 can be directly connected to the oil circuit, so that the cooling oil can directly enter each stator slot 102, and the uniformity and efficiency of the heat dissipation of the coil winding can be ensured. In this embodiment, the first groove 111, the third groove 211 and the third groove 212 are arranged corresponding to the tooth portion 103 of each punching sheet, so that each groove can accurately correspond to each other when stacking, so as to realize the oil circuit connection and facilitate the assembly of the stator core 100.

[0047] See also Figures 1 to 10 As shown, in this embodiment, the overlapping area of ​​the first groove 111 and the second groove 112 is greater than 1.2 mm 2 The overlapping area of ​​the fourth groove 212 and the first groove 111 is greater than 1.25 mm 2 The overlapping area of ​​the third groove 211 and the fourth groove 212 is greater than 1.25 mm 2 To ensure that the flow area requirements can be met after stacking, to ensure that the oil path is unobstructed, and the cooling oil can flow normally in the oil channel.

[0048] See also Figures 1 to 10 As shown, in this embodiment, the two second grooves 112 on both sides of the first groove 111 are symmetrically arranged about the first groove 111, which is beneficial to the processing and manufacturing of the first punching sheet 11 and also beneficial to the stacking of the first punching sheet 11 to form the first stacking body 10 with the oil circuit penetrating.

[0049] See also Figure 1 , Figure 2 and Figure 3 , Fig.13 and Fig.14 As shown, in this embodiment, the first groove 111 is arranged along the radial extension of the stator core 100, and the second groove 112 is arranged along the circumferential extension of the stator core 100, or is arranged at an angle to the bottom of the stator slot 102, and the inclination direction points to the first groove 111, so that when multiple first stacking bodies 10 are stacked, the first groove 111 and the second groove 112 partially overlap to achieve oil circuit communication. It should be noted that the shapes of the first groove 111, the second groove 112, the third groove 211 and the fourth groove 212 described in the above embodiments can be designed to be conical, elliptical, rectangular, etc., and the angle can be appropriately adjusted to ensure that the core has a flow area that meets the requirements after rotation and stacking.

[0050] See also Figures 1 to 10As shown, in this embodiment, the outer diameter of the second stacking body 20 is smaller than the outer diameter of the first stacking body 10, so that after the stator core 100 is installed in the motor housing 210, an annular oil passage 104 is formed between the first stacking body 10 and the motor housing 210 located on both sides of the second stacking body 20, and the annular oil passage 104 is connected to the third groove 211 in the second stacking body 20, so that the cooling oil flows into each stator slot 102 through the annular oil passage 104, the third groove 211, the fourth groove 212, the first groove 111 and the second groove 112 in sequence.

[0051] See also Figure 1 , Fig. 9 , Fig.11 and Fig.12 As shown, in this embodiment, the outer circumference of the first punching sheet 11 is provided with a welding groove, and after a plurality of first stacking bodies 10 are stacked, a stepped welding groove is formed along the circumference thereof, and a stepped weld 105 arranged in a stepped manner is formed by welding, and the stepped weld 105 can ensure the strength of the iron core and can also ensure the sealing of the oil passage formed with the housing. Further, a plurality of outer diameter teeth 22 are provided on the outer circumference of the second punching sheet 21, and the outer diameter of the outer diameter teeth 22 is the same as the outer diameter of the first punching sheet 11, and a welding groove 23 is provided on the side of the outer diameter teeth 22 away from the stator slot 102, and is arranged corresponding to the welding groove of the first stacking body 10, so as to facilitate the welding of the second stacking body 20 and the first stacking body 10. It should be noted that when a plurality of second punching sheets 21 are stacked to form the second stacking body 20, each of the outer diameter teeth 22 is arranged in a staggered manner in the annular oil passage 104, and the path of the annular oil passage 104 will not be blocked. Of course, in some embodiments, each punching sheet and the stacking body may also be connected by gluing.

[0052] See also Figure 1 As shown, an application case of a 48-slot 8-pole motor is used for explanation: the stator slot features and oil channel openings of the first stack 10 are arrayed in 12 groups in units of 30°. There is a first groove 111 at the root of the teeth of stator slots 2 and 3. The groove width can be designed to be 1mm to 2.5mm, and the groove length (along the radial direction of the punching sheet) can be designed to be 2mm to 8mm. The slot opening and slot width in the stator slot 1 are asymmetrical. The left side of the asymmetric slot needs to be offset to the left of the slot centerline, that is, offset to one side of the first groove 111. The design value can be 0.6mm to 2mm. After the core is rotated clockwise by 7.5°, that is, the angle of 1 stator slot, as shown in the figure, the right side of the second groove 112 at the bottom of the stator slot 1 can overlap with the bottom of the first groove 111, and the overlapping area is greater than 1.2mm 2 The asymmetric groove (second groove 112 ) in the stator slot 4 and the asymmetric groove (second groove) in the stator slot 1 are arranged symmetrically with respect to the first groove 111 .

[0053] See also Figure 1 , Figure 2 and Figure 3 , Figure 6 and Figure 7 As shown, when the first stacking bodies 10 are stacked, the height of a stack of first stacking bodies 10 is greater than 2.5 mm. Multiple first stacking bodies 10 are stacked, and each stacking body is rotated 7.5°+n×30° (n is an integer>0) at the angle of the previous stacking body. According to this stacking rule, the first stack is 0°, the second stack is 7.5°+n×30°, the third stack is 15°+n×30°, and so on. The rotation direction is consistent, and both clockwise and counterclockwise are feasible. The cooling oil crosses a plug slot every time it flows through 3 stacks of iron cores.

[0054] See also Figure 1 , Figure 4 and Figure 5 , Figure 8 and Fig. 9 As shown, the outer diameter of the second stack 20 is 12 teeth, and the maximum outer diameter is the same as the outer diameter of the first stack 10. The height of the outer diameter tooth 22 can be designed to be 3mm to 7mm. There is a third groove 211 at the root of the outer diameter tooth toward the center of the circle, that is, the vertical position of the tooth portion 103. The groove width can be designed to be 1.5mm to 5mm. After overlapping with the first stack 10, the bottom of the third groove 211 can overlap with the first groove 111 of the first stack 10, and the overlapping flow area is greater than 1.25mm 2 A fourth groove 212 is designed in the area of ​​the yoke 101 corresponding to the tooth 103, and the groove width can be designed to be 1.5mm to 5mm. After the core is rotated 15° clockwise according to the placement method in the figure, that is, the angle of 2 grooves, the fourth groove 212 can overlap with the third groove 211, and the overlapping area is greater than 1.25mm 2 .

[0055] See also Figure 1 , Figure 4 and Figure 5 , Figure 8 and Fig. 9 As shown, in this embodiment, the second stack 20 can be divided into a plurality of sub-stacks for stacking, and the height of a stack of sub-stacks can be designed to be 3 mm to 8 mm. Two stacks of sub-stacks are used for stacking, and the staggered angle is designed to be n×15° (n is an integer > 0). After stacking, the fourth groove 212 can partially overlap with the third groove 211.

[0056] See also Figures 1 to 10As shown, the first stacking body 10 and the second stacking body 20 are stacked, and the first groove 111 of the first stacking body 10 needs to partially overlap with the third groove 212 of the second stacking body 20. Specifically, the second stacking body 20 including 2 stacking bodies and the stator core composed of 24 stacking bodies 10, the middle of the stator core of the application case is the second stacking body 20, the staggered angle is 30°, and the two sides of the second stacking body 20 are 12 stacking bodies 10, the rotation angles are clockwise and counterclockwise respectively, and the adjacent cores are staggered at an angle of 7.5°. After the motor housing 210 is assembled with the stator core 100 by interference fit, it is sealed with the second stacking body 20 to form an annular oil passage 104, and the oil reaches the stator core annular oil passage from the housing oil inlet to fill it.

[0057] See also Figures 1 to 10 , Fig.16 As shown, after stacking, taking the three stacks of first stacks 10 near the middle of the stator core as an example, due to the oil pressure, the oil enters the fourth groove 212 of the adjacent sub-stack from the third groove 211 of a sub-stack of the second stack 20, and then enters the first groove 111 of the adjacent next stack of first stacks 10, and then enters the right asymmetric groove (the second groove 112 at the bottom of the stator slot 4) of the adjacent next stack of first stacks 10, and finally enters the left asymmetric groove (the second groove 112 at the bottom of the stator slot 1) of the adjacent next stack of first stacks 10. The asymmetric groove entered from the first groove 111 is determined according to the direction of the rotation angle, and there is no strict requirement, but the left and right asymmetric grooves need to be adjacent to form the necessary stepped oil passages 120, and the area where the asymmetric grooves are connected can directly contact the winding conductor, directly taking away the heat generated by the conductor.

[0058] See also Figures 1 to 10 , Fig.16 As shown, the winding conductor of each slot has two positions in the slot that are in direct contact with the cooling oil in the cooling oil channel, and the cooling oil will eventually be sprayed out from one of the first groove 111 of the first stack body 10 and the two second grooves 112 on both sides of the first groove 111. The number of oil channels where the conductor is in direct contact with the cooling oil in the slot can be increased according to design requirements by increasing the number of stacks and other methods to increase the contact positions.

[0059] Of course, the stacking angle of the first stacking body 10 can be selected to be 15°, that is, each stack of iron cores is rotated 15°+n×30° (n is an integer > 0) at the angle of the previous stack. According to this stacking rule, the first stack is 0°, the second stack is 15°+n×30°, the third stack is n×30°, and so on. The rotation direction is consistent, and both clockwise and counterclockwise are feasible. After the oil enters the first groove 111 of the first stacking body 10 from the fourth groove 212 of the second stacking body 20, it enters the left (right) asymmetric groove, and then enters the right (left) asymmetric groove of the next stack, and so on. Whether it is necessary to enter the first groove 111 in the middle can be determined according to the actual application plan, and a flexible design can be made. The cooling oil crosses a wiring slot every time it flows through 2 stacking bodies.

[0060] It is also understood that the local groove characteristics of the first stack 10 can also be modified, such as Fig.14 The figure shows a 22.5° local slot feature, with 16 arrays. The adjacent core stacks are rotated 7.5° to form a stepped oil path. The corresponding outer diameter design of the second stack body 20 can be adjusted to 16 teeth. The third groove 211 and the fourth groove 212 are modified accordingly, so that a stepped oil path 120 is formed at the bottom of the stator core wire slot, which enables the cooling medium to directly contact the conductor to take away heat.

[0061] The cooling effect comparison table of the above scheme and the existing oil circuit scheme is shown in Table 1.

[0062] Table 1 Comparison of different cooling schemes

[0063] Oil circuit solution Winding temperature range / ℃(low speed~high speed) Cooling effect Shell water cooling 150～200 Difference Core outer diameter oil channel cooling 135～180 generally Tooth root iron core oil channel cooling 130～170 better This program 119～155 very good

[0064] It can be seen from the above table that the temperature range of the winding of the solution of the present application is significantly smaller than that of other existing solutions in the low-speed and high-speed ranges, and it has a better cooling effect.

[0065] See also Figures 1 to 17 As shown, the present invention further proposes a motor, the motor 200 includes a rotor 220 and a stator, the stator is arranged on the outer circumference of the rotor, and the stator and the rotor are arranged coaxially, and the stator includes the stator core 100 described in the above embodiment. It should be noted that the structure of the stator core is similar or the same as the stator core 100 described in the above embodiment, and in order to avoid repetition, it will not be repeated here.

[0066] The present invention proposes a stator core and a motor, which are designed to include a stacked body formed by two types of punching sheets, so that an oil channel is formed from the stator core to the circumference. The oil channel is formed by stacking the grooves on the punching sheets, so that cooling oil can enter each wire slot and directly contact the coil winding, thereby effectively reducing the temperature of the motor stator. The cooling oil quickly takes away the heat from the key heat-generating part, that is, the heat of the winding conductor in the slot, thereby achieving efficient heat dissipation.

[0067] The present invention proposes a stator core and a motor. By entering each wire slot from the middle of the outer circumference of the stator core and flowing to the two ends of the stator core, this design can maintain the temperature consistency of the two ends of the stator to the greatest extent, avoid the problem of uneven temperature field caused by excessive temperature difference between inlet and outlet oil temperatures due to excessive length and bending of the cooling oil channel, reduce the influence of thermal stress on the motor structure, improve the reliability and working stability of the motor, and the cooling strategy is easy to design and control.

[0068] The present invention provides a stator core and a motor, wherein cooling oil flows from the end surface of the core to the stator winding, effectively reducing the temperature of the end of the stator winding. The stator winding is the part of the motor that generates the most heat. By reducing the winding temperature, the continuous performance of the motor is improved and failures caused by excessive temperature are reduced.

[0069] The present invention proposes a stator core and a motor. The stator core has a simple structure and only needs to design two stator punching sheets for stacking. The stator cooling design provides important support for improving the cooling and heat dissipation capacity of the motor, improving continuous output performance, and improving reliability.

[0070] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

[0071] In the description herein, many specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of the specific details or with other devices, systems, components, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0072] References throughout this specification to "one embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention, and not necessarily in all embodiments. Thus, various appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout this specification do not necessarily refer to the same embodiment. In addition, the particular features, structures, or characteristics of any specific embodiment of the invention may be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the invention described and illustrated herein may be possible in light of the teachings herein and are to be considered part of the spirit and scope of the invention.

[0073] It should also be understood that one or more of the elements shown in the figures may also be implemented in a more separate or more integrated manner, or even removed because they are inoperable in certain circumstances or provided because they may be useful depending on the application.

[0074] In addition, unless otherwise explicitly indicated, any marking arrows in the drawings should be regarded as exemplary only and not limiting. In addition, unless otherwise indicated, the term "or" used herein is generally intended to mean "and / or". In the case where the term is not clear because it is anticipated that the ability to separate or combine is provided, the combination of components or steps will also be regarded as indicated.

[0075] As used in the description herein and throughout the claims that follow, "a," "an," and "the" include plural references unless otherwise indicated. Likewise, as used in the description herein and throughout the claims that follow, the meaning of "in" includes "in" and "on," unless otherwise indicated.

[0076] The above description of the illustrated embodiments of the present invention (including the contents described in the Abstract) is not intended to be an exhaustive list or to limit the present invention to the precise form disclosed herein. Although specific embodiments of the present invention and examples of the present invention are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the present invention as will be recognized and appreciated by those skilled in the art. As noted, these modifications may be made to the present invention in accordance with the above description of the embodiments described in the present invention, and these modifications will be within the spirit and scope of the present invention.

[0077] Systems and methods have been generally described herein as details that aid in understanding the present invention. In addition, various specific details have been given to provide an overall understanding of embodiments of the present invention. However, those skilled in the relevant art will recognize that embodiments of the present invention may be practiced without one or more of the specific details, or may be practiced using other devices, systems, accessories, methods, components, materials, parts, etc. In other cases, well-known structures, materials, and / or operations are not specifically shown or described in detail to avoid confusion with various aspects of embodiments of the present invention.

[0078] Thus, although the invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the foregoing disclosure, and it should be understood that in some cases, some features of the invention will be employed without the corresponding use of other features without departing from the scope and spirit of the proposed invention. Thus, many modifications may be made to adapt a particular environment or material to the essential scope and spirit of the invention. The invention is not intended to be limited to the specific terms used in the claims below and / or the specific embodiments disclosed as the best mode contemplated for carrying out the invention, but the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Thus, the scope of the invention will be determined solely by the appended claims.

Claims

1. A stator core, characterized in that: include: A first stack composed of first punching sheets, wherein a first groove and a second groove are provided on a yoke portion of the first punching sheet along a circumferential direction thereof, wherein the second groove is provided at the bottom of a stator slot spaced one stator slot apart on both sides of the first groove, wherein the second groove is communicated with the stator slot and deviates in the direction of the first groove; A second stack composed of second punching sheets, wherein a plurality of third grooves are provided on the outer circumference of the second punching sheets along the circumference thereof, and a plurality of fourth grooves are provided on the yoke thereof, wherein the third grooves and the fourth grooves are arranged with a tooth portion in between, and in the second stack, the third grooves of a part of the second punching sheets partially overlap with the fourth grooves of another part of the second punching sheets; The first stacking bodies are arranged on both sides of the second stacking body, and at least two first stacking bodies are arranged on at least one side, the first groove of the first stacking body close to the second stacking body partially overlaps with the fourth groove, and the first groove between multiple first stacking bodies partially overlaps with the second groove.

2. The stator core according to claim 1, characterized in that: The two second grooves on both sides of the first groove are arranged symmetrically with respect to the first groove.

3. The stator core according to claim 1, characterized in that: The first groove is arranged to extend in the radial direction of the stator core, and the second groove is arranged to extend in the circumferential direction of the stator core or is arranged to be inclined with respect to the bottom of the stator slot.

4. The stator core according to claim 1, characterized in that: The plurality of first stacked bodies located on one side of the second stacked bodies are rotated in sequence in a clockwise direction or a counterclockwise direction by a distance of at least one stator slot.

5. The stator core according to claim 1, characterized in that: The overlapping area of ​​the first groove and the second groove is greater than 1.2 mm 2 The overlapping area of ​​the fourth groove and the first groove is greater than 1.25mm 2 The overlapping area of ​​the third groove and the fourth groove is greater than 1.25 mm 2 .

6. The stator core according to claim 1, characterized in that: The outer diameter of the second stacked body is smaller than that of the first stacked body. An annular oil passage is formed between the first stacked body and the motor housing on both sides of the second stacked body. The annular oil passage is communicated with the third groove.

7. The stator core according to claim 6, characterized in that: The outer circumference of the first punching sheet is provided with a welding groove, and a plurality of the first stacking bodies are stacked to form a stepped welding groove arranged along the circumference thereof, and welded to form a weld seam arranged in a stepped manner.

8. The stator core according to claim 7, characterized in that: A plurality of outer diameter teeth are arranged on the outer circumference of the second punching sheet, the outer diameter of the outer diameter teeth is the same as the outer diameter of the first punching sheet, and a welding groove is arranged on the side of the outer diameter teeth away from the stator slot and is arranged corresponding to the welding groove of the first stack body.

9. The stator core according to claim 1, characterized in that: The first groove, the third groove and the third groove are arranged corresponding to the tooth portions of the respective punching sheets.

10. A motor, characterized in that: include: A rotor and a stator, wherein the stator is coaxially arranged around the outer circumference of the rotor, and the stator comprises the stator core according to any one of claims 1 to 9.

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