Motor stator and motor

Abstract

The present invention discloses a motor stator and a motor, and relates to the technical field of motors, wherein the motor stator comprises a stator core, a shell and at least one spray assembly; the stator core is penetrated with a receiving hole along its axial direction, a stator winding is arranged on the hole wall of the receiving hole, and the receiving hole is used for the motor rotor to pass through, and a plurality of cooling channels arranged at intervals along the circumference of the receiving hole and penetrated are opened on the end face of the stator core arranged in the axial direction; the shell is sleeved on the outside of the stator core, and the shell is provided with a medium inlet connected with the cooling channel; the spray assembly is arranged at at least one end of the stator core arranged in the axial direction, and the spray assembly has a spray part, which is connected with the cooling channel and arranged toward the receiving hole, so as to spray the cooling medium on the stator winding; the technical solution provided by the present invention can cool the stator winding inside the stator core, and has a good cooling effect.

Description

Technical Field

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

[0002] With the rapid development of the new energy vehicle industry, permanent magnet synchronous motors are being used more and more widely in the field of new energy vehicles. With the development of technology, the dynamic requirements of vehicles are getting higher and higher. As the power density and torque of motors continue to increase, the cooling methods of motors are also diversified.

[0003] In the related art, an oil injection pipe is used to cool the windings of the motor. The use of the oil injection pipe requires additional oil pipes to be added inside the motor, which makes the pipelines inside the motor more complicated and increases the cost of the motor. In addition, the oil injection pipe cannot penetrate deep into the motor and cannot cool the windings and iron core inside the motor.

[0004] Therefore, how to cool the windings inside the motor has become a problem that needs to be solved urgently by people in this field. Summary of the invention

[0005] The main purpose of the present invention is to provide a motor stator and a motor, aiming to cool the winding inside the motor and improve the cooling effect.

[0006] To achieve the above-mentioned purpose, the motor stator proposed in the present invention includes a stator core, a shell and at least one spray assembly; the stator core is penetrated by a receiving hole along its axial direction, a stator winding is arranged on the hole wall of the receiving hole, and the receiving hole is used for the motor rotor to pass through, and the stator core is provided with a plurality of cooling channels arranged at intervals along the circumference of the receiving hole and passing through the end face thereof in the axial direction; the shell is sleeved on the outside of the stator core, and the shell is provided with a medium inlet connected to the cooling channel; the spray assembly is arranged at at least one end of the stator core in the axial direction, and the spray assembly has a spray part, which is connected to the cooling channel and arranged toward the receiving hole so as to be able to spray the cooling medium on the stator winding.

[0007] In one embodiment, the spray assembly includes a spray ring, which is arranged on the axial end face of the stator core. A spray groove is opened on the inner wall surface of the spray ring, and one end of the spray groove along the axial direction of the stator core is connected to the corresponding cooling channel; the spray part includes the spray groove.

[0008] In one embodiment, the spray ring includes a plurality of spray plates and a guide member; the plurality of spray plates are stacked along the axial direction of the stator core, and a plurality of openings are provided on the inner side of each spray plate, which are axially through-arranged and correspond to the plurality of cooling channels; the guide member is arranged on the side of the plurality of spray plates away from the stator core, and the guide member is abutted against the spray plates to define a plurality of spray slots together with the plurality of openings.

[0009] In one embodiment, the width of the spray slot is gradually increased in a direction from the edge of the stator core to the center.

[0010] In one embodiment, every three adjacent cooling channels form a cooling group, and two spray assemblies are provided; each spray assembly also includes an extension member arranged between the spray ring and the stator core, and the two extension members are respectively arranged at both ends of the stator core along its axial direction, and each extension member forms an extension channel and a connecting channel extending along the axial direction and arranged at intervals; one end of the connecting channel is blocked by the spray ring, and the other end is connected to two adjacent cooling channels in a cooling group, and in the two adjacent cooling channels, the other end of one cooling channel is connected to the connecting channel on the opposite side of the connecting channel, and the other end of the other cooling channel is connected to the extension channel on the opposite side of the connecting channel; one end of the extension channel is connected to the spray slot, and the other end is connected to the remaining cooling channels in the cooling group, and the other end of the remaining cooling channels is connected to the connecting channel on the opposite side of the extension channel.

[0011] In one embodiment, each extension member includes a plurality of extension plates, and the plurality of extension plates are stacked along the axial direction of the stator core. Each extension plate is provided with connecting holes and extension holes arranged at intervals. The connecting holes of the plurality of extension plates form a connecting channel, and the extension holes of the plurality of extension plates form an extension channel. The connecting hole on one of the extension members is arranged corresponding to the extension hole on another extension member.

[0012] In one embodiment, a groove extending along the circumference of the stator core is formed on the inner wall of the shell, and the shell and the stator core define an inlet channel at the groove, and the inlet channel is connected to the medium inlet and the cooling channel.

[0013] In one embodiment, the stator core includes a plurality of first punches and at least one second punch; the plurality of first punches are stacked, and each first punch is provided with a plurality of first cooling holes on its axial end face; the second punch is located between two adjacent first punches, and the second punch is provided with a plurality of second cooling holes on its axial end face, and the corresponding second cooling holes are connected with the first cooling holes to form a cooling channel, and some of the second cooling holes are provided with notches facing the outside of the second punch to connect the inlet channel with the cooling channel.

[0014] In one embodiment, a plurality of winding slots spaced apart along the circumference of the accommodating hole are formed on the hole wall of the accommodating hole, and the stator winding is wound in the winding slots.

[0015] The present invention further provides a motor, comprising the motor stator and the motor rotor as described above, wherein the motor rotor is inserted into the accommodating hole and is located on the inner side of the stator winding.

[0016] The technical solution of the present invention is to introduce a cooling medium into a medium inlet on the shell, and the cooling medium is introduced into a cooling channel. When the cooling medium flows in the cooling channel, it absorbs the heat on the stator core and indirectly absorbs the heat on the stator winding inside the stator core. When the cooling medium is sprayed through the spray part, it takes away the heat on the stator winding, so as to cool the winding inside the stator core and improve the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of an embodiment of a motor stator provided by the present invention;

[0019] Figure 2 for Figure 1 Schematic diagram of the structure of the stator core;

[0020] Figure 3 for Figure 2 A schematic diagram of the structure of the first punching sheet of the middle stator core;

[0021] Figure 4 for Figure 2 A schematic diagram of the structure of the second punching sheet of the middle stator core;

[0022] Figure 5 for Figure 1 Schematic diagram of the extension structure of the middle spray assembly;

[0023] Figure 6 for Figure 1 Schematic diagram of the spray ring structure of the middle spray assembly;

[0024] Figure 7 for Figure 1 Schematic diagram of the flow guide structure of the middle spray assembly;

[0025] Figure 8 for Figure 1 Schematic diagram of the structure of the middle shell;

[0026] Fig. 9 for Figure 1 Schematic diagram of the path of the cooling medium;

[0027] Fig.10 for Fig. 9 Schematic diagram of the path direction of the cooling medium.

[0028] Description of Figure Numbers:

[0029] 100. Motor stator; 1. Stator core; 11. First punching sheet; 111. First cooling hole; 112. First through hole; 113. First winding hole; 12. Second punching sheet; 121. Second cooling hole; 1211. Notch; 122. Second through hole; 123. Second winding hole; 1A. Accommodating hole; 1B. Winding slot; Cooling channel; 2. Housing; 2A. Inlet channel; 21. Medium inlet; 22. Groove; 3. Spray assembly; 31. Spray ring; 31A. Spray slot; 311. Spray sheet; 3111. Opening; 312. Guide piece; 3121. Guide sheet 3121; 32. Extension piece; 33A. Connecting channel; 33B. Extension channel; 321. Extension sheet; 3211. Connecting hole; 3212. Extension hole; 4. Marking slot; 5. Stator welding slot.

[0030] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] With the rapid development of the new energy vehicle industry, permanent magnet synchronous motors are being used more and more widely in the field of new energy vehicles. With the development of technology, the requirements for vehicle power are getting higher and higher. As the power density and torque of the motor continue to increase, the cooling methods of the motor are also diversified. In the related technology, a fuel injection pipe is used to cool the windings of the motor. The use of a fuel injection pipe requires additional oil pipes to be added to the motor, making the pipelines inside the motor more complicated and increasing the cost of the motor. In addition, the fuel injection pipe cannot penetrate deep into the motor and cannot cool the windings and iron core inside the motor.

[0035] Based on this, the present invention proposes a motor stator 100. Figure 1 and Figure 2 In one embodiment of the present invention, a motor stator 100 includes a stator core 1, a housing 2 and at least one spray assembly 3; the stator core 1 is penetrated with a receiving hole 1A along its axial direction, a stator winding (not shown in the figure) is arranged on the hole wall of the receiving hole 1A, and the receiving hole 1A is used for the motor rotor to pass through, and a plurality of cooling channels 1C arranged at intervals along the circumferential direction of the receiving hole 1A and penetratingly arranged are opened on the end face of the stator core 1 arranged in the axial direction; the housing 2 is sleeved on the outside of the stator core 1, and the housing 2 is provided with a medium inlet 21 connected with the cooling channel 1C; the spray assembly 3 is arranged at at least one end of the stator core 1 arranged in the axial direction, and the spray assembly 3 has a spray part, which is connected with the cooling channel 1C and arranged toward the receiving hole 1A, so as to spray the cooling medium on the stator winding.

[0036] The technical solution of the present invention is to introduce a cooling medium into the medium inlet 21 on the shell 2, and the cooling medium is introduced into the cooling channel 1C. When the cooling medium flows in the cooling channel 1C, it absorbs the heat on the stator core 1 and indirectly absorbs the heat on the stator winding inside the stator core 1. When the cooling medium is sprayed through the spray part, it takes away the heat on the stator winding, so as to cool the winding inside the stator core 1 and improve the cooling effect.

[0037] Specifically, the spray assembly 3 can be provided as one or more. When only one spray assembly 3 is provided, the spray assembly 3 is provided at one axial end of the stator core 1. At this time, in order to increase the length of the cooling channel 1C, the medium inlet 21 is provided at a position close to the other end of the housing 2; when two spray assemblies 3 are provided, the two spray assemblies 3 can be provided at both ends of the stator core 1, and the medium inlet 21 is provided at a middle position of the housing 2 close to the stator core 1; when more than two spray assemblies 3 are provided, multiple spray parts can be provided at both ends of the stator core 1 according to the motor structure and the heating condition.

[0038] Of course, there are many options for the spraying part, which can be set as a nozzle or a spray hole connected to the cooling channel 1C, and can spray toward the receiving hole 1A.

[0039] The cooling medium may be cooling oil, cooling solution or other fluids with high specific heat capacity.

[0040] See also Figure 6 and Figure 7 In one embodiment of the present invention, the spray assembly 3 includes a spray ring 31, which is arranged on the end surface of the stator core 1 along the axial direction. A spray groove 31A is provided on the inner wall surface of the spray ring 31, and one end of the spray groove 31A along the axial direction of the stator core 1 is correspondingly connected to the corresponding cooling channel 1C; the spray part includes the spray groove 31A. When the cooling medium enters the spray groove 31A along one end of the cooling channel 1C, and the spray groove 31A is arranged on the inner wall surface of the spray ring 31, so that the notch of the spray ring 31 is arranged toward the receiving hole 1A, the cooling medium will be sprayed out from the notch of the spray groove 31A under pressure, thereby spraying on the stator winding.

[0041] Among them, one end of the spray groove 31A is connected to the cooling channel 1C and the other end is blocked. The groove of the spray groove 31A forms an injection port for spraying the cooling medium. For the spraying of the cooling medium, the spray groove 31A and the cooling channel 1C form a medium channel with an injection port opened on the side of one end.

[0042] In one embodiment of the present invention, the spray ring 31 includes a plurality of spray plates 311 and a guide member 312; the plurality of spray plates 311 are stacked along the axial direction of the stator core 1, and a plurality of openings 3111 are provided on the inner side of each spray plate 311 and are arranged through the axial direction and correspond to the plurality of cooling channels 1C; the guide member 312 is arranged on the side of the plurality of spray plates 311 away from the stator core 1, and the guide member 312 abuts against the spray plates 311 to define a plurality of spray slots 31A together with the plurality of openings 3111. The spray slots 31A are formed at the openings 3111 by stacking the plurality of spray plates 311 and the guide member 312, and the axial size of the spray slots 31A can be controlled by controlling the number of stacked spray plates 311, thereby controlling the spray flow rate of the cooling medium, and the number of stacked plates can be controlled according to the motor size requirements by setting the guide member 312 and the spray plates 311, thereby changing the size of the spray ring 31 to adapt to the sizes of various motors.

[0043] Furthermore, the guide member 312 is formed by stacking a plurality of guide plates 3121 , which are blocked at positions corresponding to the openings 3111 , so as to define a spray slot 31A together with the plurality of spray plates 311 .

[0044] In one embodiment of the present invention, the width of the spray slot 31A is gradually increased in the direction from the edge of the stator core 1 to the center. The size of the spray slot 31A is set so that the cross-sectional area of ​​the cooling medium along the flow direction gradually increases when the cooling medium is sprayed out, thereby increasing the spray area and improving the cooling effect.

[0045] Specifically, when the spray ring 31 is composed of a plurality of spray sheets 311 and guide members 312 stacked together, the shape of the opening 3111 on the spray sheet 311 is a triangle, a trapezoid or other shapes whose width gradually increases from the edge of the spray sheet 311 to the center.

[0046] In one embodiment of the present invention, please refer to Figure 5 and Fig. 9 , every three adjacent cooling channels 1C form a cooling group, and two spray assemblies 3 are provided; each spray assembly 3 also includes an extension piece 32 arranged between the spray ring 31 and the stator core 1, and the two extension pieces 32 are respectively arranged at the two ends of the stator core 1 along its axial direction, and each extension piece 32 forms an extension channel 33B and a connecting channel 33A extending along the axial direction and arranged at intervals; one end of the connecting channel 33A is blocked by the spray ring 31, and the other end is connected to two adjacent cooling channels 1C in a cooling group, in which the other end of one cooling channel 1C is connected to the connecting channel 33A on the opposite side of the connecting channel 33A, and the other end of the other cooling channel 1C is connected to the extension channel 33B on the opposite side of the connecting channel 33A; one end of the extension channel 33B is connected to the spray slot 31A, and the other end is connected to the remaining cooling channels 1C in the cooling group, and the other end of the remaining cooling channels 1C is connected to the connecting channel 33A on the opposite side of the extension channel 33B. The connecting channel 33A connects two adjacent cooling channels 1C. When the cooling medium enters a cooling channel 1C, it first flows through the connecting channel 33A to the other adjacent cooling channel 1C, and then flows back in the opposite direction to the other end of the cooling channel 1C and is sprayed out from the spray slot 31A, thereby increasing the time that the cooling medium stays in the cooling channel 1C and enhancing the cooling effect.

[0047] In one embodiment of the present invention, each extension member 32 includes a plurality of extension pieces 321, and the plurality of extension pieces 321 are stacked along the axial direction of the stator core 1. Each extension piece 321 is provided with a connecting hole 3211 and an extending hole 3212 arranged at intervals. The connecting holes 3211 of the plurality of extension pieces 321 form a connecting channel 33A, and the extending holes 3212 of the plurality of extension pieces 321 form an extending channel 33B. The connecting hole 3211 on one extension member 32 is arranged corresponding to the extending hole 3212 on another extension member 32. The extension member 32 is formed by stacking a plurality of extension pieces 321, so that the thickness of the extension member 32 is easy to adjust to meet the size requirements of different motors.

[0048] Furthermore, in order to reduce weight, the extension sheet 321 is configured as an annular sheet structure.

[0049] Specifically, at one end of the stator core 1, a plurality of extension pieces 321, a plurality of spray pieces 311, and a plurality of guide pieces 3121 are stacked in sequence in a direction away from the stator core 1 to form an extension piece 32, a spray piece, and a guide piece 312 arranged in sequence. Among them, the adjacent connecting holes 3211 and the extension holes 3212 opened on the extension piece 321 form a hole group, and a hole group is correspondingly arranged with a cooling group for the reflux of the cooling medium.

[0050] See also Figures 2 to 4 In one embodiment of the present invention, the stator core 1 includes a plurality of first punching sheets 11 and at least one second punching sheet 12; the plurality of first punching sheets 11 are stacked, and each first punching sheet 11 is provided with a plurality of first cooling holes 111 on its axial end surface; the second punching sheet 12 is located between two adjacent first punching sheets 11, and the second punching sheet 12 is provided with a plurality of second cooling holes 121 on its axial end surface, and the corresponding second cooling holes 121 are connected with the first cooling holes 111 to form a cooling channel 1C, and part of the second cooling holes 121 is provided with a notch 1211 facing the outside of the second punching sheet 12 to connect the inlet channel 2A with the cooling channel 1C. The notch 1211 is provided on the second punching sheet 12 to connect the inlet channel 2A with the cooling channel 1C, and the number of the second punching sheets 12 can be adjusted according to the installation requirements while ensuring the strength of the stator core 1, thereby changing the flow rate of the cooling medium at the inlet of the cooling channel 1C.

[0051] Correspondingly, in order to achieve correspondence during installation, a marking groove 4 is also opened on the circumferential side of each extension piece 321, spray piece 311, guide piece 3121, first punching piece 11, and second punching piece 12, so that the marking grooves 4 can be quickly aligned during installation to achieve connectivity between the channels.

[0052] See also Figure 1 and Fig. 9 In one embodiment of the present invention, the inner wall of the housing 2 is formed with a groove 22 extending along the circumferential direction of the stator core 1. The housing 2 and the stator core 1 define an inlet channel 2A at the groove 22. The inlet channel 2A is connected to the medium inlet 21 and the cooling channel 1C. The groove 22 is directly provided on the housing 2 to form the inlet channel 2A with the stator core 1, without introducing other pipelines, saving space and reducing costs.

[0053] In one embodiment of the present invention, a plurality of winding slots 1B arranged at intervals along the circumferential direction are provided on the hole wall of the receiving hole 1A, and the stator winding is wound in the winding slots 1B. The winding slots 1B are used to wind the stator winding, increase the contact area between the stator winding and the stator core 1, improve the heat exchange rate between the stator winding and the stator core 1, and reduce the distance between the stator winding and the cooling channel 1C, increase the heat exchange efficiency between the stator winding and the cooling channel 1C, and improve the cooling effect.

[0054] In one embodiment of the present invention, in order to show the matching relationship between the sheet structures such as the first punching sheet 11 and the second punching sheet 12 in each component of the motor stator 100, the structure of each component of the motor stator 100 is described in turn.

[0055] First, the stator core 1 is described. The stator core 1 includes a first core section, a second core section, and a third core section stacked in sequence. The first core section and the third core section are formed by stacking first punching sheets 11, and the second core section is formed by stacking second punching sheets 12. A first through hole 112 is penetrated at the center of the end face of the first punching sheet 11, and a second through hole 122 is penetrated at the center of the end face of the second punching sheet 12. A plurality of first through holes 112 and second through holes 122 are connected to form a receiving hole 1A, and a plurality of through holes 112 and second through holes 122 are arranged circumferentially along the first punching sheet 11 on the end face of the first punching sheet 11. There are n first winding holes 113 axially extending through the first punching sheet 11, the first winding holes 113 are connected with the first through hole 112, and n second winding holes 123 axially extending through the second punching sheet 12 are arranged circumferentially on the end surface of the second punching sheet 12, the second winding holes 123 are connected with the second through hole 122 (n is an integer, and its value is determined according to the motor strength, cooling requirements and other relevant conditions). The multiple first winding holes 113 of the first punching sheet 11 and the multiple second winding holes 123 of the second punching sheet 12 correspond to each other, forming n winding slots 1B.

[0056] Furthermore, in order to fix the motor stator 100 on the housing 2, the end surface of the first punching sheet 11 is provided with n first cooling holes 111 to form a part of the cooling channel 1C which is equal to and corresponds to the winding slots 1B in number; at the same time, the outer edge of the first punching sheet 11 is provided with n / 6 (n / 6 is an integer) stator welding slots 5 and two marking slots 4; at the same time, in order to distinguish the two marking slots 4, the slot radii of the two marking slots 4 are different, namely R1 and R2; and the angle of the central angle formed by the two marking slots 4 is set to α, , so that the two marking grooves 4 are set at asymmetric positions to facilitate installation.

[0057] Correspondingly, the second punching sheet 12 is provided with n second cooling holes 121, among which every two second cooling holes 121 are provided with notches 1211, thereby forming 2n / 3 second cooling holes 121 without notches 1211 and n / 3 second cooling holes 121 with notches 1211; at the same time, the outer edge of the second punching sheet 12 is provided with n / 6 corresponding stator welding slots 5.

[0058] During installation, multiple first punching sheets 11 are stacked to form a first section of the core and a third section of the core, and multiple second punching sheets 12 are stacked to form a second section of the core. The welding grooves of the first section of the core, the second section of the core and the third section of the core are aligned, and the marking groove 4 of the first section of the core with a size of R1 and the marking groove 4 of the third section of the core with a size of R2 are aligned, so that the marking groove 4 of the first section of the core with a size of R2 and the marking groove 4 of the third section of the core with a size of R1 are arranged on both sides of the axis of the stator core 1, which can eliminate the thickness difference of each first punching sheet 11 and the second punching sheet 12 in different directions and improve the geometric accuracy of the stator core 1; the position setting of the marking groove 4 and the stator welding groove 5 enables the first punching sheet 11 and the second punching sheet 12 to form n cooling channels 1C and n winding slots 1B after installation, and there are n / 3 gaps 1211 in the n cooling channels 1C.

[0059] Next, the spray assembly 3 is described. A plurality of extension pieces 321 , a plurality of spray pieces 311 , and a plurality of guide pieces 3121 are sequentially stacked along a direction away from the stator core 1 .

[0060] The extension piece 321 is provided with n / 3 connecting holes 3211 and n / 3 extending holes 3212 along its circumference. The connecting holes 3211 and the extending holes 3212 are alternately arranged, and the extension holes 3212 are larger in size so as to connect two adjacent cooling channels 1C. A marking groove 4 with a radius of R1 and n / 6 stator welding grooves 5 are provided on the outer edge of the extension piece 321.

[0061] The spray plate 311 is provided with n / 3 trapezoidal openings 3111 corresponding to the extension holes 3212 ; a marking groove 4 with a radius of R1 and n / 6 stator welding grooves 5 are provided on the outer edge of the spray plate 311 .

[0062] The guide plate 3121 is provided with a marking groove 4 with a radius of R1 and n / 6 stator welding grooves 5 on its outer edge.

[0063] During installation, the n / 6 stator welding grooves 5 on the extension piece 321, the spray piece 311 and the guide piece 3121 are matched one by one, and the marking groove 4 with a radius of R1 is matched. The positions of the marking groove 4 and the stator welding groove 5 are set so that the extension piece 321, the spray piece 311 and the guide piece 3121 can form n / 3 connecting channels 33A, n / 3 extension channels 33B and n / 3 spray grooves 31A after installation. The n / 3 connecting channels 33A are partially blocked by the non-opening 3111 on the spray piece 311, and the n / 3 extension channels 33B are connected to the opening 3111 part on the spray piece 311, that is, they are connected to the spray groove 31A.

[0064] Next, the welding process of the stator core 1 and the spray assembly 3 is explained. The marking groove 4 with a radius of R1 in one spray assembly 3 is welded to the marking groove 4 with a size of R2 in the first section of the core, and the marking groove 4 with a radius of R1 in another spray assembly 3 is welded to the marking groove 4 with a size of R1 in the third section of the core. The marking groove 4 is set at a position that allows the connecting holes 3211 at both ends to be staggered by an angle of 360 / n.

[0065] Finally, the installation process of the stator core 1 and the housing 2 is described. A groove 22 is extended on the inner wall of the housing 2 along the circumference of the stator core 1 to form an inlet channel 2A. The inlet channel 2A is connected to the notch 1211 .

[0066] See also Fig. 9 and Fig.10 There are two flow directions of the cooling medium. For the convenience of explanation, the two ends of the stator core 1 along the axial direction are the left end and the right end, and the three cooling channels 1C in each cooling group are numbered in sequence as the first cooling channel, the second cooling channel, and the third cooling channel.

[0067] The first flow direction of the cooling medium is: medium inlet 21 → inlet channel 2A → n / 3 notches 1211 → n / 3 second cooling channels → n / 3 connecting channels 33A at the left end → n / 3 first cooling channels → n / 3 extension channels 33B at the right end → n / 3 spray slots 31A at the right end of the stator core 1;

[0068] The second flow direction is: medium inlet 21 → inlet channel 2A → n / 3 notches 1211 → n / 3 second cooling channels → n / 3 connecting channels 33A at the right end → n / 3 third cooling channels → n / 3 extension channels 33B at the left end → n / 3 spray slots 31A at the left end of the stator core 1.

[0069] The present invention also provides a motor, which includes the motor stator 100 and the motor rotor as described above. The specific structure of the motor stator refers to the above embodiment. Since the motor adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the motor rotor is inserted into the accommodating hole 1A and is located on the inner side of the stator winding.

[0070] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A motor stator, characterized in that: The motor stator comprises: The stator core has a receiving hole extending through it in the axial direction, a stator winding is arranged on the hole wall of the receiving hole, and the receiving hole is used for the motor rotor to pass through, and a plurality of cooling channels are arranged at intervals along the circumference of the receiving hole and are provided through the stator core on the axially arranged end surface; a housing, which is sleeved on the outside of the stator core, and the housing is provided with a medium inlet communicating with the cooling channel; and At least one spray assembly is disposed at at least one end of the stator core disposed in the axial direction, the spray assembly having a spray portion, the spray portion is communicated with the cooling channel and disposed toward the receiving hole, so as to be able to spray a cooling medium onto the stator winding; The spray assembly includes a spray ring, which is arranged on the end surface of the stator core along the axial direction, and a spray groove is opened on the inner wall surface of the spray ring, and one end of the spray groove along the axial direction of the stator core is connected to the corresponding cooling channel; the spray part includes the spray groove; Every three adjacent cooling channels form a cooling group, and two spray assemblies are provided; Each of the spray assemblies further comprises an extension piece disposed between the spray ring and the stator core, two of the extension pieces are disposed at two ends of the stator core along the axial direction thereof, and each of the extension pieces is formed with an extension channel and a communication channel extending along the axial direction and disposed at intervals; One end of the communication channel is blocked by the spray ring, and the other end is communicated with two adjacent cooling channels in one cooling group, and in the two adjacent cooling channels, the other end of one cooling channel is communicated with the communication channel on the opposite side of the communication channel, and the other end of the other cooling channel is communicated with the extension channel on the opposite side of the communication channel; One end of the extension channel is communicated with the spray slot, and the other end is communicated with the remaining cooling channels in the cooling group, and the other end of the remaining cooling channels is communicated with the connecting channel on the opposite side of the extension channel.

2. The motor stator according to claim 1, characterized in that: The spray ring comprises: A plurality of spray plates are stacked along the axial direction of the stator core, and a plurality of openings are provided on the inner side of each of the spray plates and are axially penetrating and corresponding to the plurality of cooling channels; and, A flow guide is arranged on a side of the plurality of spray plates away from the stator core, and the flow guide abuts against the spray plates to define a plurality of spray slots together with the plurality of openings.

3. The motor stator according to claim 1, characterized in that: The width of the spray slot is gradually increased in a direction from the edge of the stator core to the center.

4. The motor stator according to claim 1, characterized in that: Each of the extension pieces includes a plurality of extension pieces, the plurality of extension pieces are stacked along the axial direction of the stator core, each of the extension pieces is provided with a connecting hole and an extension hole arranged at intervals, the connecting holes of the plurality of extension pieces form the connecting channel, and the extension holes of the plurality of extension pieces form the extension channel; The communicating hole on one of the extending members is arranged correspondingly to the extending hole on the other extending member.

5. The motor stator according to claim 1, characterized in that: A groove extending along the circumference of the stator core is formed on the inner wall of the shell. The shell and the stator core define an inlet channel at the groove. The inlet channel is communicated with the medium inlet and the cooling channel.

6. The motor stator according to claim 5, characterized in that: The stator core comprises: A plurality of first punching sheets are stacked, each of the first punching sheets is provided with a plurality of first cooling holes on its axial end surface; and, At least one second punch is located between two adjacent first punches, and a plurality of second cooling holes are formed on the axial end surface of the second punch, and the corresponding second cooling holes are connected with the first cooling holes to form the cooling channel, and some of the second cooling holes are provided with notches facing the outside of the second punch to connect the inlet channel with the cooling channel.

7. The motor stator according to claim 1, characterized in that: A plurality of winding slots arranged at intervals along the circumference of the accommodating hole are provided on the hole wall of the accommodating hole, and the stator winding is wound in the winding slots.

8. A motor, characterized in that: The motor comprises: The motor stator according to any one of claims 1 to 7; and The motor rotor is inserted into the accommodating hole and is located inside the stator winding.

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