Insulating bushing, hairpin motor and vehicle

Abstract

The present application discloses an insulating bushing, a hairpin motor and a vehicle. The insulating bushing comprises a body and supporting members; the outer contour of the cross section of the body is matched with the outer contour of the cross section of a stator slot of a stator core; the body is provided with an accommodating cavity allowing for fitting of stator windings; thinning grooves are formed in the wall of the body; the fracture strength of the part, forming the bottom surfaces of the thinning grooves, in the body is lower than the strength required by fitting of the stator windings in the accommodating cavity; there are multiple supporting members, and the supporting members are arranged on the inner peripheral surface of the body; the stator windings abut against the supporting members so as to be separated from the body; the body and at least two supporting members define a cooling flow channel groove; an inlet and an outlet of the cooling flow channel groove are respectively located in the openings at two ends of the accommodating cavity; and a cooling channel is formed between each cooling flow channel groove and the stator winding. The insulating bushing provided by the present application has the advantages of facilitating the formation of cooling channels in direct contact with stator windings, and achieving a good cooling effect on stator windings.

Description

Insulating bushings, flat wire motors and vehicles

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on June 16, 2023, with application number 202321555757.8 and application name “Insulating Bushing, Flat Wire Motor and Vehicle” and the Chinese patent application filed with the China Patent Office on June 16, 2023, with application number 202321562376.2 and application name “Insulating Bushing, Flat Wire Motor and Vehicle”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of flat wire motors, and in particular to an insulating bushing, a flat wire motor and a vehicle. Background Art

[0004] In the related art, the insulating bushing of the flat wire motor fits into the stator slot of the stator core, and the stator winding fits into the insulating bushing. The insulating bushing serves to separate the stator core from the stator winding, but at the same time, the insulating bushing also basically completely eliminates the gap between the stator winding and the stator slot to ensure that the stator winding is reliably fixed in the stator slot. As a result, the motor stator can usually only spray cooling oil on the end windings, and / or, open oil holes on the stator core, and let the cooling oil flow in the channels formed by the oil holes in the core to remove heat, and then flow to the end and spray out to complete the cooling of the stator winding. However, during the operation of the motor, the highest temperature of the motor stator occurs at the winding (copper wire) in the stator slot. The above cooling method still has the defect of poor cooling effect on the winding in the stator slot.

[0005] In the related art, the stator slots of the stator core are usually equipped with insulating bushings, and the stator windings are fitted in the insulating bushings to achieve the installation of the stator windings on the stator core. At this time, the insulating bushings are separated by the stator windings and the stator core to achieve insulation connection between the two. However, in order to facilitate the installation of the stator windings and the insulating bushings in the stator slots, a gap transition fit between the stator windings and the insulating bushings, and / or a gap or transition fit between the insulating bushings and the stator sleeves is often set. However, this setting also leads to poor reliability of the axial limit of the insulating bushings and the stator windings relative to the stator core in the stator core, which in turn causes the flat wire motor to have defects such as NVH (Noise, Vibration, Harshness) characteristics and poor stator stiffness.

[0006] Utility Model Content

[0007] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0008] To this end, some embodiments of the present application provide an insulating bushing, which has the advantage of being easy to form a cooling channel that is in direct contact with the stator winding, and having a good cooling effect on the stator winding.

[0009] Some embodiments of the present application also provide a flat wire motor.

[0010] According to some embodiments of the present application, the insulating sleeve includes a main body and a support member, the cross-sectional outer contour of the main body matches the cross-sectional outer contour of the stator slot of the stator core, and the main body has a accommodating cavity for the stator winding; there are multiple support members and they are arranged on the inner circumference of the main body, the stator winding abuts against the support members so as to be separated from the main body, the main body and at least two support members surround to form a cooling flow channel groove, the inlet and outlet of the cooling flow channel groove are respectively located at the two end openings of the accommodating cavity, and a cooling channel is formed between each cooling flow channel groove and the stator winding.

[0011] In some embodiments of the insulating bushing, a support member is provided within the body to form a cooling channel groove. When the stator winding is fitted within the housing formed by the body and abuts the support member, a cooling channel for coolant to flow is formed between the cooling channel groove and the stator winding. In this case, the coolant in the cooling channel can directly contact the stator winding, achieving direct cooling of the stator winding and achieving a more effective cooling effect.

[0012] In some embodiments, the support member extends along the axial direction of the accommodating cavity, and a plurality of support members are arranged at intervals along the circumference of the body. The body and any two adjacent support members surround and form a cooling channel groove.

[0013] In some embodiments, the maximum dimension of any support member along the circumference of the body is less than or equal to the width of any cooling channel groove.

[0014] In some embodiments, a dimension of at least a portion of the support member along the circumferential direction of the body gradually decreases toward the stator winding.

[0015] In some embodiments, the multiple support members include first support members arranged at intervals along a first direction and multiple second support members arranged at intervals along the first direction. The first support members and the second support members are respectively arranged on both sides of the stator winding, and each flat copper wire in the stator winding is abutted against at least one first support member and at least one second support member.

[0016] In some embodiments, the plurality of support members further include a third support member, the plurality of first support members, the third support members and the plurality of second support members are arranged along the circumference of the body, and the flat copper wire at the edge of the stator winding abuts against the third support segment.

[0017] In some embodiments, the body is a cylindrical structure connected end to end along its circumference.

[0018] In some embodiments, the body and the support are integrally formed.

[0019] According to some embodiments of the present application, the flat wire motor includes the insulating bushing as described in some embodiments above.

[0020] The technical advantages of the flat wire motor according to some embodiments of the present application are the same as the technical advantages of the insulating bushing in some of the above embodiments, and will not be repeated here.

[0021] The vehicle according to some embodiments of the present application includes the flat wire motor according to some embodiments described above.

[0022] The technical advantages of the vehicle according to some embodiments of the present application are the same as the technical advantages of the flat wire motor in some of the above embodiments, and will not be repeated here.

[0023] Some embodiments of the present application provide an insulating bushing having the advantages of stable and reliable connection between the stator winding and the stator core, good NVH characteristics of the flat wire motor and good stator stiffness.

[0024] Some embodiments of the present application also provide a flat wire motor.

[0025] According to some embodiments of the present application, the insulating bushing includes a main body and a support member, the cross-sectional outer contour of the main body matches the cross-sectional outer contour of the stator slot of the stator core, the main body has a receiving cavity for the stator winding, and a thinning groove is provided on the wall of the main body. The breaking strength of the part of the main body that constitutes the bottom surface of the thinning groove is lower than the strength required for the stator winding to fit in the receiving cavity.

[0026] According to some embodiments of the insulating bushing of the present application, a thinning groove is provided on the wall of the main body, and the fracture strength of the portion of the main body constituting the bottom surface of the thinning groove is ensured to be lower than the strength required for the stator winding to fit into the accommodating cavity. At this time, when the stator winding is inserted into the accommodating cavity to compress the main body, the main body breaks at the thinning groove to facilitate the smooth insertion of the stator winding into the accommodating cavity. At this time, under the pressure of the stator winding, the main body is stretched open with the local fracture and can be more tightly pressed against the wall surface of the stator slot of the stator core, thereby effectively ensuring the effective contact between the insulating bushing and the stator core and stator winding, and further effectively ensuring the stiffness of the stator and the NVH characteristics of the flat wire motor.

[0027] In some embodiments, the thinning groove extends along the axial direction of the accommodating cavity.

[0028] In some embodiments, there are at least two thinning grooves, and the at least two thinning grooves are spaced apart along the circumference of the body.

[0029] In some embodiments, the body includes a first wall, a second wall, a third wall, and a fourth wall connected end to end along the circumference of the accommodating cavity, the first wall and the third wall are spaced apart along the circumference of the stator core, the second wall and the fourth wall are spaced apart radially outward of the stator core, and each of the first wall, the third wall, and the fourth wall is provided with at least one thinning groove.

[0030] In some embodiments, each of the first wall, the third wall and the fourth wall is provided with a thinning groove, the thinning groove on the first wall is adjacent to the second wall, the thinning groove on the third wall is adjacent to the fourth wall, and the thinning groove on the fourth wall is located in the middle of the fourth wall.

[0031] In some embodiments, each thinning groove includes a plurality of sub-grooves, and the plurality of sub-grooves are spaced apart along the axial direction of the accommodating cavity.

[0032] In some embodiments, the sub-grooves are through-grooves that penetrate the wall of the body, or the sub-grooves are provided on the inner circumference or outer circumference of the body.

[0033] In some embodiments, the thinning groove is provided on the inner circumference or the outer circumference of the body, and the thinning groove penetrates the wall of the body along the axial direction of the accommodating cavity.

[0034] In some embodiments, the width of the thinning groove gradually decreases toward the bottom surface of the thinning groove.

[0035] In some embodiments, the insulating bushing also includes a support member, which is provided in plurality and is arranged on the inner circumferential surface of the main body. The stator winding abuts against the support member so as to be separated from the main body. The main body and at least two support members surround and form a cooling channel groove, and the thinning groove is arranged on the bottom surface of the cooling channel groove.

[0036] In some embodiments, the support member extends along the axial direction of the accommodating cavity, and a plurality of support members are arranged at intervals along the circumference of the body. The body and any two adjacent support members surround and form a cooling channel groove.

[0037] According to some embodiments of the present application, the flat wire motor includes the insulating bushing as described in some embodiments above.

[0038] The technical advantages of the flat wire motor according to some embodiments of the present application are the same as the technical advantages of the insulating bushing in some of the above embodiments, and will not be repeated here.

[0039] The vehicle according to some embodiments of the present application includes the flat wire motor according to some embodiments described above.

[0040] The technical advantages of the vehicle according to some embodiments of the present application are the same as the technical advantages of the flat wire motor in some of the above embodiments, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] FIG1 is a schematic diagram of an insulating bushing according to some embodiments of the present application.

[0042] FIG2 is a partial enlarged view of FIG1 .

[0043] FIG3 is another schematic diagram of an insulating bushing according to some embodiments of the present application.

[0044] FIG4 is a partial enlarged view of FIG3 .

[0045] FIG5 is a cross-sectional view of a flat wire motor at an insulating bushing according to some embodiments of the present application.

[0046] FIG6 is a schematic diagram of an insulating bushing equipped with a stator winding according to some embodiments of the present application.

[0047] FIG7 is a cross-sectional view of an insulating bushing equipped with a stator winding according to some embodiments of the present application.

[0048] FIG8 is a schematic diagram of an insulating bushing before being fitted with a stator winding according to some embodiments of the present application.

[0049] FIG9 is a cross-sectional view of an insulating bushing before being fitted with a stator winding according to some embodiments of the present application.

[0050] Reference numerals:

[0051] 100. Insulating bushing; 1. Main body; 11. Cooling channel groove; 12. Thinning groove; 121. Sub-slot; 13. First wall; 14. Second wall; 15. Third wall; 16. Fourth wall; 2. Support member; 21. First support member; 22. Second support member; 23. Third support member; 3. Stator winding; 31. Flat copper wire. DETAILED DESCRIPTION

[0052] Some embodiments of the present application are described in detail below, and examples of some embodiments are shown in the accompanying drawings. Some embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present application, but should not be understood as limiting the present application.

[0053] The insulating bushing 100 according to some embodiments of the present application is described below with reference to FIG. 1 to FIG. 5 .

[0054] According to some embodiments of the present application, the insulating bushing 100 includes a body 1 and a support member 2. The cross-sectional outer contour of the body 1 matches the cross-sectional outer contour of the stator slot of the stator core, and the body 1 has a housing for the stator winding 3. There are multiple support members 2 and they are arranged on the inner circumference of the body 1. The stator winding 3 abuts against the support members 2 so as to be spaced apart from the body 1. The body 1 and at least two support members 2 surround and form a cooling channel groove 11. The inlet and outlet of the cooling channel groove 11 are respectively located at the two end openings of the housing cavity. A cooling channel is formed between each cooling channel groove 11 and the stator winding 3.

[0055] According to some embodiments of the insulating bushing 100 of the present application, by providing a support member 2 within the body 1 to form a cooling channel groove 11, when the stator winding 3 is fitted within the housing formed by the body 1 and abuts against the support member 2, a cooling channel for coolant to pass through is formed between the cooling channel groove 11 and the stator winding 3. In this case, the coolant in the cooling channel can directly contact the stator winding 3, thereby directly cooling the stator winding 3 and achieving a better cooling effect on the stator winding 3.

[0056] It should be noted that by setting the cross-sectional outer contour of the main body 1 to match the cross-sectional outer contour of the stator slot, when the insulating bushing 100 is fitted in the stator slot, the outer peripheral surface of the main body 1 can be in close contact with the wall surface of the stator slot, and the stator core will not be deformed by the pressure of the main body 1, thereby effectively ensuring the smooth flow of the coolant in the cooling channel groove 11.

[0057] In some embodiments, as shown in FIG. 2 and FIG. 4 , the support member 2 extends axially along the accommodating cavity, and a plurality of support members 2 are arranged at intervals along the circumference of the body 1 . The body 1 and any two adjacent support members 2 surround and form a cooling channel groove 11 .

[0058] That is, the length direction of the cooling channel groove 11 formed at this time is consistent with the axial direction of the accommodating cavity, and the coolant in the cooling channel groove 11 can only flow along the axial direction of the accommodating cavity to achieve cooling of the stator winding 3.

[0059] Specifically, the length of the support member 2 is equal to the axial dimension of the body 1 in the accommodating cavity.

[0060] Alternatively, the support member 2 may be set as a point support, such as multiple point support members 2 discretely arranged on the inner circumference of the main body 1, and the stator winding 3 abuts against the support member 2 to be separated from the main body 1. At this time, at least one irregular cooling channel groove 11 may also be formed between the main body 1 and the stator winding 3.

[0061] In some embodiments, as shown in FIG. 1 to FIG. 5 , the maximum dimension of any support member 2 along the circumference of the body 1 is less than or equal to the width of any cooling channel groove 11 .

[0062] The total cross-sectional area of ​​the cooling channel groove 11 formed in the accommodating cavity can be designed to be larger, so that the contact area between the coolant inside the cooling channel and the stator winding 3 is larger, thereby achieving a better cooling effect on the stator winding 3.

[0063] Specifically, multiple support members 2 are arranged at equal intervals along the circumference of the body 1. As shown in Figure 2, the maximum dimension of the support members 2 along the circumference of the body 1 can be much smaller than the width of the cooling channel groove 11, as long as the support members 2 can support the stator core and separate the stator core from the body 1. As shown in Figure 3, the maximum dimension of the support members 2 along the circumference of the body 1 can also be roughly equal to the width of the cooling channel.

[0064] In some embodiments, as shown in FIG. 2 , FIG. 4 and FIG. 5 , the size of at least a portion of the support member 2 along the circumferential direction of the body 1 gradually decreases toward the direction approaching the stator winding 3 .

[0065] At this time, when the stator winding 3 is fitted into the accommodating cavity and presses the support member 2 , the support member 2 is more likely to deform, thereby effectively ensuring effective contact between the support member 2 and the stator winding 3 .

[0066] Specifically, the surface of the support 2 that contacts the stator winding 3 is an arc surface. When the stator winding 3 is fitted in the accommodating cavity, it will compress the support 2 to cause micro-deformation, so that the line contact between the stator winding 3 and the support 2 is changed to surface contact, thereby achieving effective contact between the stator core, the insulating bushing 100 and the stator winding 3.

[0067] In some embodiments, as shown in Figures 2, 4 and 5, the multiple support members 2 include first support members 21 arranged at intervals along the first direction and multiple second support members 22 arranged at intervals along the first direction. The first support members 21 and the second support members 22 are respectively arranged on both sides of the stator winding 3, and each flat copper wire 31 in the stator winding 3 is in contact with at least one first support member 21 and at least one second support member 22.

[0068] The plurality of flat copper wires 31 in the stator winding 3 are arranged along a first direction, wherein each flat copper wire 31, when fitted in the accommodation cavity, always presses at least one first support member 21 and at least one second support member 22, thereby effectively ensuring separation from the main body 1 under the support of the first support member 21 and the second support member 22, thereby ensuring stable forming of the cooling channel.

[0069] Specifically, as shown in Figure 2 , each flat copper wire 31 abuts against a first support member 21 and a second support member 22. Each flat copper wire 31 is sandwiched between the first support member 21 and the second support member 22, effectively securing the flat copper wire 31 within the stator slot while also forming a cooling channel with a larger cross-sectional area. As shown in Figure 5 , each flat copper wire 31 abuts against multiple first support members 21 and multiple second support members 22, forming multiple cooling channels between each flat copper wire 31 and the insulating bushing 100.

[0070] In addition, the plurality of first support members 21 are arranged at equal intervals along a first direction, and the plurality of second support members 22 are arranged at equal intervals along the first direction, where the first direction is the radial direction of the stator core.

[0071] In some embodiments, as shown in Figures 2, 4 and 5, the multiple support members 2 also include a third support member 23, the multiple first support members 21, the third support members 23 and the multiple second support members 22 are arranged along the circumference of the main body 1, and the flat copper wire 31 located at the edge of the stator winding 3 abuts against the third support segment.

[0072] The provision of the third support member 23 forms more cooling channels between the rectangular copper wires 31 at the edge and the body 1 , thereby increasing the contact area between the coolant in the cooling channels and the rectangular copper wires 31 at the edge, and providing a better cooling effect on the rectangular copper wires 31 .

[0073] In some embodiments, as shown in Figures 1 to 5, the body 1 is a cylindrical structure connected end to end along its circumference. That is, the insulating bushing 100 is sealed in a full circle, effectively ensuring that the coolant in the cooling channel can only move along the axial direction of the accommodating cavity.

[0074] In some embodiments, the body 1 and the support member 2 are integrally formed, thereby making the insulating bushing 100 simple and convenient to manufacture and having reliable strength.

[0075] Specifically, the body 1 and the support member 2 may be made of insulating plastic. In this case, the body 1 and the support member 2 may be integrally injection molded.

[0076] The flat wire motor according to some embodiments of the present application includes the insulating bushing 100 as described in some embodiments above.

[0077] The technical advantages of the flat wire motor according to some embodiments of the present application are the same as the technical advantages of the insulating bushing 100 in some embodiments described above, and are not further described here.

[0078] The vehicle according to some embodiments of the present application includes the flat wire motor according to some embodiments described above.

[0079] The technical advantages of the vehicle according to some embodiments of the present application are the same as the technical advantages of the flat wire motor in some of the above embodiments, and will not be repeated here.

[0080] The insulating bushing 100 according to some embodiments of the present application is described below with reference to FIG. 6 to FIG. 9 .

[0081] According to some embodiments of the present application, an insulating bushing 100 includes a body 1 and a support member 2. The cross-sectional outer profile of the body 1 matches the cross-sectional outer profile of the stator slots of the stator core. The body 1 has a housing for the stator winding 3. The wall of the body 1 is provided with a thinning groove 12. The portion of the body 1 that forms the bottom surface of the thinning groove has a fracture strength lower than the strength required for the stator winding 3 to fit within the housing cavity.

[0082] According to the insulating bushing 100 of some embodiments of the present application, a thinning groove 12 is provided on the wall of the main body 1, and it is ensured that the fracture strength of the portion of the main body 1 constituting the bottom surface of the thinning groove 12 is lower than the strength required for the stator winding 3 to fit into the accommodating cavity. At this time, when the stator winding 3 is inserted into the accommodating cavity to compress the main body 1, the main body 1 breaks at the thinning groove 12 to facilitate the smooth insertion of the stator winding 3 into the accommodating cavity. At this time, under the pressure of the stator winding 3, the main body 1 is stretched open with the local fracture and can be more closely pressed against the wall of the stator slot of the stator core, thereby effectively ensuring the effective contact between the insulating bushing 100 and the stator core and the stator winding 3, and further effectively ensuring the stiffness of the stator and the NVH characteristics of the flat wire motor.

[0083] It should be noted that the cross-sectional outer contour of the main body 1 matches that of the stator slots, and the main body 1 fits within the stator slots with a clearance. When the stator winding 3 fits within the accommodating cavity to expand the main body 1, the main body 1 increases in volume, supported by the stator winding 3, to stabilize against the walls of the stator slots, effectively securing the insulating bushing 100, the stator winding 3, and the stator core.

[0084] In some embodiments, as shown in FIG. 6 to FIG. 9 , the thinning groove 12 extends along the axial direction of the accommodating cavity.

[0085] When the stator winding 3 fits into the housing cavity of the main body 1 and compresses the support member 2, the main body 1 fractures substantially along the extension direction of the thinning slot 12, thereby expanding the thinning slot 12 and increasing the volume of the housing cavity. Furthermore, guided by the thinning slot 12, the fracture position of the main body 1 is more precise, and the fracture is more convenient and labor-saving.

[0086] In some embodiments, as shown in FIG. 7 to FIG. 9 , there are at least two thinning grooves 12 , and the at least two thinning grooves 12 are spaced apart along the circumference of the body 1 .

[0087] Therefore, when the stator winding 3 is fitted in the accommodating cavity, the main body 1 can expand at least two thinning slots 12 to more evenly expand the volume of the accommodating cavity, which facilitates the fitting of the stator winding 3 and also facilitates the stator winding 3 to fit more closely with the wall of the stator slot, further ensuring effective contact between the insulating bushing 100 and the stator winding 3 and the stator core.

[0088] Specifically, as shown in FIG. 7 and FIG. 9 , there are three thinning grooves 12 , and the three thinning grooves 12 are arranged at equal intervals along the circumference of the body 1 .

[0089] In some embodiments, as shown in Figures 7 and 9, the body 1 includes a first wall 13, a second wall 14, a third wall 15, and a fourth wall 16 connected end to end along the circumferential direction of the accommodating cavity. The first wall 13 and the third wall 15 are spaced apart along the circumference of the stator core, and the second wall 14 and the fourth wall 16 are spaced apart radially outward from the stator core. Each of the first wall 13, the third wall 15, and the fourth wall 16 is provided with at least one thinning groove 12.

[0090] Therefore, after the main body 1 is broken at at least three thinning grooves 12, the first wall 13, the third wall 15 and the fourth wall 16 are all stretched open to fit more closely with the two side surfaces and the bottom surface of the stator slot. As a result, the contact area between the main body 1 and the wall surface of the stator slot is larger, and the fixing reliability of the insulating bushing 100 and the stator winding 3 on the stator core is higher.

[0091] Specifically, the second wall 14 of the body 1 is bent in a direction away from the fourth wall 16 . When the stator winding 3 is inserted into the accommodating cavity, the second wall 14 can be stretched under tension to achieve smooth fitting of the stator winding 3 in the accommodating cavity.

[0092] In some embodiments, as shown in Figures 7 and 9, each of the first wall 13, the third wall 15 and the fourth wall 16 is provided with a thinning groove 12, the thinning groove 12 on the first wall 13 is adjacent to the second wall 14, the thinning groove 12 on the third wall 15 is adjacent to the fourth wall 16, and the thinning groove 12 on the fourth wall 16 is located in the middle of the fourth wall 16.

[0093] At this time, the body 1 can expand its volume more evenly after being broken and stretched at the three thinning grooves 12, so as to closely fit with the two side surfaces and bottom surface of the stator slot, further ensuring the reliability of fixing the insulating bushing 100 and the stator winding 3 on the stator core.

[0094] In some embodiments, as shown in FIG. 6 and FIG. 7 , each thinning groove 12 includes a plurality of sub-grooves 121 , and the plurality of sub-grooves 121 are arranged at intervals along the axial direction of the accommodating cavity.

[0095] Therefore, when the stator winding 3 is fitted into the accommodating cavity to open a plurality of sub-slots 121 , the portion between two adjacent sub-slots 121 ensures that the body 1 will not be divided into several independent parts, ensuring that the body 1 effectively separates the stator winding 3 and the stator core.

[0096] Specifically, as shown in FIG6 , each thinning groove 12 includes three sub-grooves 121 , and the portion of the body 1 located between two adjacent sub-grooves 121 has an axial dimension in the accommodating cavity that is much smaller than the length of the sub-grooves 121 .

[0097] In addition, the thinning groove 12 may be a through groove penetrating the wall of the main body 1 , or may be a groove having a bottom surface provided on the inner circumference or outer circumference of the main body 1 .

[0098] In some embodiments, as shown in FIG8 and FIG9 , the thinning groove 12 is provided on the inner circumference or the outer circumference of the body 1 , and the thinning groove 12 passes through the wall of the body 1 along the axial direction of the accommodating cavity.

[0099] The wall thickness of the main body 1 at the thinning groove 12 is smaller than the wall thickness at other positions. When the stator winding 3 is fitted in the accommodating cavity to compress the support member 2, the main body 1 is more likely to break at the thinning groove 12 to facilitate effective contact between the main body 1 and the wall of the stator slot.

[0100] As shown in FIG8 and FIG9 , the thinning groove 12 is provided on the inner circumference of the main body 1 , and the length of the thinning groove 12 is equal to the length of the main body 1 .

[0101] In some embodiments, as shown in FIG. 9 , the width of the thinning groove 12 gradually decreases toward the bottom surface of the thinning groove 12 .

[0102] That is, the outer contour of the cross section of the thinning groove 12 is generally triangular. In other words, the thinning groove 12 is a V-shaped groove. Therefore, when the stator winding 3 is fitted into the accommodating cavity to compress the support member 2, it is easier to stretch the thinning groove 12 so that the wall of the main body 1 at the thinning groove 12 can be broken, and the breaking of the main body 1 is more labor-saving and convenient.

[0103] In some embodiments, the insulating bushing 100 also includes a support member 2, which is provided in plurality and is arranged on the inner circumferential surface of the main body 1. The stator winding 3 abuts against the support member 2 so as to be separated from the main body 1. The main body 1 and at least two support members 2 surround and form a cooling channel groove 11, and the thinning groove 12 is arranged on the bottom surface of the cooling channel groove 11.

[0104] By providing a support member 2 within the body 1 to form the cooling channel groove 11, when the stator winding 3 fits within the housing formed by the body 1 and abuts the support member 2, a cooling channel for coolant to pass through can be formed between the cooling channel groove 11 and the stator winding 3. In this case, the coolant in the cooling channel can directly contact the stator winding 3 to achieve direct cooling of the stator winding 3, thereby achieving a better cooling effect on the stator winding 3. In this case, the thinning groove 12 is provided on the bottom surface of the cooling channel groove 11 and can be formed together with the cooling channel groove 11. This makes the formation of the thinning groove 12 simpler and more convenient, and reduces the processing cost of the insulating bushing 100.

[0105] In some embodiments, as shown in FIG. 6 to FIG. 9 , the support member 2 extends axially along the accommodating cavity, and a plurality of support members 2 are arranged at intervals along the circumference of the body 1 . The body 1 and any two adjacent support members 2 surround and form a cooling channel groove 11 .

[0106] That is, the length direction of the cooling channel groove 11 formed at this time is consistent with the axial direction of the accommodating cavity, and the coolant in the cooling channel groove 11 can only flow along the axial direction of the accommodating cavity to achieve cooling of the stator winding 3.

[0107] Specifically, the length of the support member 2 is equal to the axial dimension of the body 1 in the accommodating cavity.

[0108] Alternatively, the support member 2 may be set as a point support, such as multiple point support members 2 discretely arranged on the inner circumference of the main body 1, and the stator winding 3 abuts against the support member 2 to be separated from the main body 1. At this time, at least one irregular cooling channel groove 11 may also be formed between the main body 1 and the stator winding 3.

[0109] In some embodiments, as shown in Figures 7 and 9 , the plurality of support members 2 include first support members 21 spaced apart along a first direction and a plurality of second support members 22 spaced apart along the first direction. The first support members 21 and the second support members 22 are disposed on either side of the stator winding 3, and each rectangular copper wire 31 in the stator winding 3 abuts against at least one first support member 21 and at least one second support member 22.

[0110] The plurality of flat copper wires 31 in the stator winding 3 are arranged along a first direction, wherein each flat copper wire 31, when fitted in the accommodation cavity, always presses at least one first support member 21 and at least one second support member 22, thereby effectively ensuring separation from the main body 1 under the support of the first support member 21 and the second support member 22, thereby ensuring stable forming of the cooling channel.

[0111] Specifically, as shown in Figure 7, each flat copper wire 31 is in contact with multiple first support members 21 and multiple second support members 22. At this time, each flat copper wire 31 is clamped between multiple first support members 21 and multiple second support members 22, ensuring that the flat copper wire 31 is effectively fixed in the stator slot. At the same time, multiple cooling channels can be formed between each flat copper wire 31 and the insulating bushing 100 to form a cooling channel with a larger cross-sectional area.

[0112] In addition, the plurality of first support members 21 are arranged at equal intervals along a first direction, and the plurality of second support members 22 are arranged at equal intervals along the first direction, where the first direction is the radial direction of the stator core.

[0113] In some embodiments, as shown in Figures 7 and 9, the multiple support members 2 also include a third support member 23, the multiple first support members 21, the third support members 23 and the multiple second support members 22 are arranged along the circumference of the main body 1, and the flat copper wire 31 located at the edge of the stator winding 3 abuts against the third support segment.

[0114] The provision of the third support member 23 forms more cooling channels between the rectangular copper wires 31 at the edge and the body 1 , thereby increasing the contact area between the coolant in the cooling channels and the rectangular copper wires 31 at the edge, and providing a better cooling effect on the rectangular copper wires 31 .

[0115] In some embodiments, the body 1 and the support member 2 are integrally injection-molded, thereby making the insulating bushing 100 simple and convenient to manufacture and having reliable strength.

[0116] The flat wire motor according to some embodiments of the present application includes the insulating bushing 100 as described in some embodiments above.

[0117] The technical advantages of the flat wire motor according to some embodiments of the present application are the same as the technical advantages of the insulating bushing 100 in some embodiments described above, and are not further described here.

[0118] The vehicle according to some embodiments of the present application includes the flat wire motor according to some embodiments described above.

[0119] The technical advantages of the vehicle according to some embodiments of the present application are the same as the technical advantages of the flat wire motor in some of the above embodiments, and will not be repeated here.

[0120] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0121] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0122] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0123] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0124] In this application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with some embodiments or examples are included in some embodiments or examples of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials or characteristics described can be combined in some embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine some embodiments or examples described in this specification and the features of some embodiments or examples without contradiction.

[0125] Although some of the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Changes, modifications, substitutions and variations of the above embodiments made by ordinary technicians in this field are all within the scope of protection of the present application.

Claims

1. An insulating bushing, characterized in that: include: A body, the cross-sectional outer contour of the body matches the cross-sectional outer contour of the stator slot of the stator core, and the body has an accommodating cavity for the stator winding; and A support member, wherein the support members are in plurality and are arranged on the inner circumferential surface of the main body, the stator winding abuts against the support members so as to be spaced apart from the main body, the main body and at least two of the support members surround and form a cooling channel groove, the inlet and outlet of the cooling channel groove are respectively located at the openings at both ends of the accommodating cavity, and a cooling channel is formed between each of the cooling channel grooves and the stator winding.

2. The insulating bushing according to claim 1, characterized in that: The support member extends along the axial direction of the accommodating cavity, and a plurality of the support members are arranged at intervals along the circumferential direction of the body. The body and any two adjacent support members surround and form the cooling flow channel groove.

3. The insulating bushing according to claim 2, characterized in that: The maximum dimension of any of the support members along the circumferential direction of the body is less than or equal to the width of any of the cooling channel grooves.

4. The insulating bushing according to claim 2, characterized in that: A dimension of at least a portion of the support member along the circumferential direction of the body gradually decreases toward the direction approaching the stator winding.

5. The insulating bushing according to claim 1, characterized in that: The multiple support members include first support members arranged at intervals along a first direction and multiple second support members arranged at intervals along the first direction. The first support members and the second support members are arranged on both sides of the stator winding, and each flat copper wire in the stator winding is abutted against at least one of the first support members and at least one of the second support members.

6. The insulating bushing according to claim 5, characterized in that: The plurality of support members further include a third support member. The plurality of first support members, the third support members and the plurality of second support members are arranged along the circumferential direction of the body. The flat copper wires at the edge of the stator winding abut against the third support segment.

7. The insulating bushing according to claim 1, characterized in that: The main body is a cylindrical structure connected end to end along its circumference.

8. The insulating bushing according to claim 1, characterized in that: The body and the support member are integrally formed.

9. A flat wire motor, characterized in that: Comprising the insulating bushing as described in any one of claims 1-8.

10. A vehicle, characterized in that: Comprising the flat wire motor as claimed in claim 9.

11. An insulating bushing, characterized in that: include: The main body has a cross-sectional outer contour that matches the cross-sectional outer contour of the stator slot of the stator core, the main body has a housing cavity for the stator winding, a thinning groove is provided on the wall of the main body, and the thinning groove is formed in the main body. The breaking strength of the bottom surface of the thin slot is lower than the strength required for the stator winding to fit in the accommodating cavity.

12. The insulating bushing according to claim 11, characterized in that: The thinning groove extends along the axial direction of the accommodating cavity.

13. The insulating bushing according to claim 12, characterized in that: There are at least two thinning grooves, and at least two of the thinning grooves are arranged at intervals along the circumference of the body.

14. The insulating bushing according to claim 12, characterized in that: The body includes a first wall, a second wall, a third wall and a fourth wall connected end to end along the circumferential direction of the accommodating cavity, the first wall and the third wall are arranged at intervals along the circumferential direction of the stator core, the second wall and the fourth wall are arranged at intervals radially outward of the stator core, and each of the first wall, the third wall and the fourth wall is provided with at least one thinning groove.

15. The insulating bushing according to claim 14, characterized in that: A thinning groove is provided on each of the first wall, the third wall and the fourth wall. The thinning groove on the first wall is adjacent to the second wall, the thinning groove on the third wall is adjacent to the fourth wall, and the thinning groove on the fourth wall is located in the middle of the fourth wall.

16. The insulating bushing according to claim 12, characterized in that: Each of the thinning grooves includes a plurality of sub-grooves, and the plurality of sub-grooves are arranged at intervals along the axial direction of the accommodating cavity.

17. The insulating bushing according to claim 16, characterized in that: The branch groove is a through groove penetrating through the wall of the main body, or the branch groove is arranged on the inner peripheral surface or the outer peripheral surface of the main body.

18. The insulating bushing according to claim 12, characterized in that: The thinning groove is arranged on the inner circumference or the outer circumference of the body, and the thinning groove penetrates the wall of the body along the axial direction of the accommodating cavity.

19. The insulating bushing according to claim 18, characterized in that: The width of the thinning groove gradually decreases toward the bottom surface of the thinning groove.

20. The insulating bushing according to any one of claims 11 to 18, characterized in that: The insulating bushing also includes a support member, which is in multiple numbers and is arranged on the inner circumferential surface of the main body. The stator winding abuts against the support member so as to be separated from the main body. The main body and at least two of the support members surround and form a cooling flow channel groove, and the thinning groove is arranged on the bottom surface of the cooling flow channel groove.

21. The insulating bushing according to claim 20, characterized in that The support member extends along the axial direction of the accommodating cavity, and a plurality of the support members are arranged at intervals along the circumferential direction of the body. The body and any two adjacent support members surround and form the cooling flow channel groove.

22. A flat wire motor, characterized in that: Comprising an insulating bushing as described in any one of claims 11-21.

23. A vehicle, characterized in that: Comprising the flat wire motor as claimed in claim 20.

Images