Insulation framework and motor stator core assembling structure

Abstract

The invention provides an insulating framework and motor stator iron core assembling structure. The insulating framework and motor stator iron core assembling structure comprises an insulating framework and a plurality of stator iron core punching sheets arranged in the insulating framework in a stacked mode. The insulating framework is provided with a framework groove bottom surface, a framework connecting inclined surface and M transition connecting surfaces II which are arranged in sequence, and the framework groove bottom surface and the framework connecting inclined surface are arranged in an intersecting manner; the transition connecting surface II at the head end and the framework tooth part of the insulating framework, two adjacent transition connecting surfaces II, and the transition connecting surface II at the tail end and the framework connecting inclined surface are connected through arc concave surfaces; the stator iron core punching sheet is provided with an iron core groove bottom surface, an iron core connection inclined surface and M transition connection surfaces 1 which are arranged in sequence. The bottom face of the iron core groove corresponds to the bottom face of the framework groove, the iron core connecting inclined face corresponds to the framework connecting inclined face, and the first transition connecting face corresponds to the second transition connecting face. According to the invention, the effects of increasing the contact area between the winding coil and the insulating framework and increasing the slot fullness rate can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of motor design, and in particular to an assembly structure of an insulation frame and a motor stator core. Background Art

[0002] With the progress of society and the development of new energy vehicles, in order to make full use of electric energy, the market, including various OEMs, has gradually replaced traditional mechanical pumps with electronic oil pumps for cooling and lubrication of main drive motors, engines, gearboxes, etc. Therefore, electronic oil pumps with high efficiency, high power density, high torque density, lightweight and other excellent performance can meet market demand.

[0003] The Chinese patent application with publication number CN117424378A discloses a simple assembled split core insulation frame structure and its assembly method. The patent application relates to a split insulation frame and its assembly method on the stator core, which can reduce the mold opening cost of the insulation frame of the stator core with different axial lengths. However, the patent application still uses the traditional flat-bottom slot core structure and insulation frame, and the slot fill rate still needs to be improved.

[0004] In summary, an insulating frame and motor stator core assembly structure is urgently needed to solve the problem that the existing flat-bottom slot stator core structure for electronic oil pumps and the insulating frame assembled therein occupy slot space and reduce the slot fill rate. Summary of the invention

[0005] The present invention aims to provide an insulating frame and a motor stator core assembly structure, aiming to solve the problem that the existing flat-bottom slot stator core structure for an electronic oil pump and the insulating frame assembled therein occupy slot space and reduce the slot fill rate. The specific technical solution is as follows:

[0006] An insulating frame and motor stator core assembly structure, comprising an insulating frame and a plurality of stator core punching sheets stacked and arranged inside the insulating frame;

[0007] The insulating skeleton is provided with a skeleton groove bottom surface, a skeleton connection inclined surface and M transition connection surfaces 2 arranged in sequence, the skeleton groove bottom surface and the skeleton connection inclined surface are arranged to intersect, and the transition connection surface 2 at the head end and the skeleton tooth portion of the insulating skeleton, between two adjacent transition connection surfaces 2, and between the transition connection surface 2 at the tail end and the skeleton connection inclined surface are all connected through arc concave surfaces;

[0008] The stator core punching sheet is provided with a core slot bottom surface, a core connecting inclined surface and M transition connecting surfaces 1 arranged in sequence; wherein: the core slot bottom surface is arranged corresponding to the skeleton slot bottom surface, the core connecting inclined surface is arranged corresponding to the skeleton connecting inclined surface, the transition connecting surface 1 is arranged in a one-to-one correspondence with the transition connecting surface 2, and the transition connecting surface 1 at the head end is connected to the core tooth portion on the stator core punching sheet, and the transition connecting surface 1 at the tail end is connected to the core connecting inclined surface; wherein, M is a natural number greater than or equal to 1.

[0009] Preferably, a winding coil formed by enameled wire is wound on the skeleton tooth portion of the insulating skeleton, and the winding coil includes a plurality of enameled wire layers arranged from the inside to the outside, wherein the innermost enameled wire layer is arranged tangent to the skeleton tooth portion, and the outermost enameled wire layer is arranged at the position where the bottom surface of the skeleton groove intersects with the skeleton connecting inclined surface.

[0010] Preferably, the distance between the centers of two adjacent arc concave surfaces is equal to the outer diameter of the enameled wire.

[0011] Preferably, the radius of the arc concave surface is equal to the outer radius of the enameled wire.

[0012] Preferably, when the number of enameled wire layers LY2 is an even number, the number of enameled wire layers LYQ2 in the winding coil tangent to the bottom of the insulating frame is M+LY2 / 2 layers; when the number of enameled wire layers LY2 is an odd number, the number of enameled wire layers LYQ2 in the winding coil tangent to the bottom of the insulating frame is M+(LY2-1) / 2 layers.

[0013] Preferably, two adjacent enameled wires in the winding coil are arranged tangentially.

[0014] Preferably, the core slot bottom surface and the core connection slope, the core connection slope and transition connection surface one, two adjacent transition connection surfaces one, and transition connection surface one and the core tooth portion are all intersectingly arranged or are connected by arc surface transition.

[0015] Preferably, the arc concave surface and the skeleton connecting inclined surface, the arc concave surface and the second transition connecting surface, and the arc concave surface and the skeleton tooth portion are all tangent to each other.

[0016] Preferably, the insulating frame is a full-circular structure, and a plurality of frame teeth are provided on the inner side thereof, and both sides of the root of the frame teeth are provided with a frame groove bottom surface, a frame connection inclined surface and M transition connection surfaces arranged in sequence;

[0017] The stator core punching sheet is also a full-circle structure, and a plurality of core teeth are arranged on the inner side thereof. Both sides of the root of the core teeth are provided with a core slot bottom surface, a core connection inclined surface and M transition connection surfaces arranged in sequence.

[0018] The number of the skeleton teeth is equal to the number of the core teeth.

[0019] Preferably, a plurality of stator core punching sheets are stacked and then wrapped by an insulating frame to form a block assembly, and the plurality of block assemblies are arranged along a circumferential direction to form a full-circular stator.

[0020] The application of the technical solution of the present invention has the following beneficial effects:

[0021] The assembly structure of the present invention can increase the number of enameled wire layers tangent to the bottom of the insulating frame in the winding coil, thereby increasing the contact area between the winding coil and the insulating frame and increasing the slot fill rate. Compared with the existing flat-bottom slot core structure, the heat dissipation area of ​​the winding in the assembly structure of the present invention is larger, which can effectively reduce the temperature rise of the winding, thereby reducing the temperature rise of the motor assembly; at the same time, the winding structure of the present invention is more stable and has less vibration.

[0022] With the same number of turns, the assembly structure of the present invention can reduce the difficulty of winding the enameled wire, simplify the winding process, and reduce the number of winding layers of the enameled wire.

[0023] With the same total number of enameled wire layers, the present invention has more enameled wire layers tangent to the bottom of the insulating skeleton. When the same torque is output at the same speed, the line current and winding loss of the improved assembly structure of the present invention are significantly reduced compared with the existing assembly structure.

[0024] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 is a cross-sectional view of the assembly structure in Example 1;

[0027] Figure 2 is an axonometric view of the insulating skeleton in Example 1;

[0028] Figure 3 is an axonometric view of the stator core punching sheet in Example 1;

[0029] Figure 4 It is a schematic diagram of the stator core punching sheet in the form of a full circle structure;

[0030] Figure 5 It is a cross-sectional view of the existing assembly structure;

[0031] Figure 6is a schematic diagram of winding the enameled wire in the existing assembly structure when the assembly structure in Example 1 has the same number of turns as the existing assembly structure;

[0032] Figure 7 1 is a schematic diagram comparing the U-phase current of the assembly structure in Example 1 and the existing assembly structure at the same output speed (500 rpm) and the same torque (2 Nm);

[0033] Figure 8 It is a schematic diagram comparing the line current and winding loss of the assembly structure in Example 1 and the existing assembly structure at the same output speed (500rpm) and the same torque;

[0034] Fig. 9 is a cross-sectional view of the assembly structure in Example 2;

[0035] Fig.10 is an axonometric view of the insulating skeleton in Example 2;

[0036] Fig.11 is a top view of the stator core punching sheet in Example 2;

[0037] Among them, 11, stator core punching sheet, 111, core slot bottom surface, 112, core connection inclined surface, 113, transition connection surface 1, 114, core tooth portion;

[0038] 21. insulating frame, 211. frame groove bottom surface, 212. frame connection inclined surface, 213. arc concave surface, 214. transition connection surface 2, 215. frame tooth portion;

[0039] 31. Winding coil, 311. First layer of enameled wire, 312. Second layer of enameled wire, 313. Third layer of enameled wire, 314. Fourth layer of enameled wire. DETAILED DESCRIPTION

[0040] In order to facilitate the understanding of the present invention, the present invention will be described more fully below, and preferred embodiments of the present invention are provided. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0042] Embodiment 1:

[0043] See also Figure 1-Figure 4This embodiment provides an insulating frame and a motor stator core assembly structure, including an insulating frame 21 and a plurality of stator core punching sheets 11 stacked and arranged inside the insulating frame 21;

[0044] See also Figure 1 and Figure 2 The insulating skeleton 21 is provided with a skeleton groove bottom surface 211, a skeleton connecting inclined surface 212 and M transition connecting surfaces 214 arranged in sequence, the skeleton groove bottom surface 211 and the skeleton connecting inclined surface 212 are arranged to intersect, and the transition connecting surface 214 at the head end and the skeleton tooth portion 215 of the insulating skeleton 21, between two adjacent transition connecting surfaces 214, and between the transition connecting surface 214 at the tail end and the skeleton connecting inclined surface 212 are all connected by an arc concave surface 213; a notch is formed at the position where the skeleton groove bottom surface 211 of the insulating skeleton 21 and the skeleton tooth portion 215 are connected by the skeleton connecting inclined surface 212, the transition connecting surface 214 and the arc concave surface 213;

[0045] See also Figure 1 and Figure 3 The stator core punching sheet 11 is provided with a core slot bottom surface 111, a core connection inclined surface 112 and M transition connection surfaces 113 arranged in sequence; wherein: the core slot bottom surface 111 is arranged correspondingly to the skeleton slot bottom surface 211, the core connection inclined surface 112 is arranged correspondingly to the skeleton connection inclined surface 212, and the transition connection surface 113 is arranged correspondingly to the transition connection surface 214; further, the core slot bottom surface 111 and the core connection inclined surface 112 are arranged at the intersection The transition connection surface 113 at the head end is connected to the core tooth portion 114 on the stator core punching sheet 11, and the transition connection surface 113 at the tail end is connected to the core connection bevel 112. A notch is formed at the connection position between the core slot bottom surface 11 of the stator core punching sheet 11 and the core tooth portion 114 through the core connection bevel 112 and the transition connection surface 113, thereby ensuring that the stator core punching sheet 11 can be arranged in the insulating frame 21; wherein M is a natural number greater than or equal to 1.

[0046] Preferably, the skeleton teeth 215 of the insulating skeleton 21 are wound with winding coils 31 formed by enameled wires, and the winding coils 31 generally include multiple layers of enameled wires arranged from the inside to the outside, wherein the innermost enameled wire layer is arranged tangent to the skeleton teeth 215, and the outermost enameled wire is arranged at the intersection of the skeleton groove bottom surface 211 and the skeleton connecting inclined surface 212 (that is, the enameled wire closest to the groove bottom in the outermost enameled wire is connected to the intersection between the skeleton groove bottom surface 211 and the skeleton connecting inclined surface 212). Preferably, the enameled wire is a round copper wire.

[0047] In this embodiment, the distance between the centers of two adjacent arc concave surfaces 213 is equal to the outer diameter of the enameled wire, and at the same time, the radius of the arc concave surface 213 is equal to the outer radius of the enameled wire. In this way, the arc concave surface 213 can just accommodate the outer diameter of the enameled wire, and the transition connection surface 214 and the arc concave surfaces 213 on both sides thereof can just accommodate two enameled wires; since the adjacent transition connection surfaces 214 are connected through the arc concave surface 213, more enameled wires can be tangent to the bottom of the insulating frame 21 under this structural form.

[0048] Preferably, the arc concave surface 213 and the skeleton connection inclined surface 212, the arc concave surface 213 and the transition connection surface 214, and the arc concave surface 213 and the skeleton tooth portion 215 are all tangent to ensure smooth transition connection between surfaces.

[0049] Preferably, the core slot bottom surface 111 and the core connecting bevel 112, the core connecting bevel 112 and the transition connection surface 113, between two adjacent transition connection surfaces 113, and between the transition connection surface 113 and the core tooth portion 114 are all intersectingly arranged or connected by arc surface transition; whether the surfaces on the stator core punching sheet 11 are intersectingly arranged or connected by arc surface transition with a small radius, it will not affect the assembly between the stator core punching sheet 11 and the insulating frame 21.

[0050] Preferably, the stator core punching sheet 11 is an integrally formed circular structure, and a plurality of core teeth 114 are arranged along the circumferential direction on the inner side of the stator core punching sheet 11, and a core connection inclined surface 112 and a transition connection surface 113 are provided between the core teeth 114 and the core slot bottom surface 111 to form a recess (that is, both sides of the root of the core teeth 114 are provided with a core slot bottom surface 111, a core connection inclined surface 112 and M transition connection surfaces 113 arranged in sequence), such as Figure 4 As shown; the insulating skeleton 21 is also a full-circular structure, with a plurality of skeleton teeth 215 provided on its inner side, and skeleton groove bottom surfaces 211, skeleton connection slopes 212 and M transition connection surfaces 214 arranged in sequence are provided on both sides of the roots of the skeleton teeth 215; after the stator core punching sheets 11 are stacked to form a stator core group, two insulating skeletons are used to wrap the stator core group from both sides.

[0051] In some embodiments, a plurality of the stator core punching sheets 11 may form a complete circular structure, and correspondingly, a plurality of the insulating frames may also form a complete circular structure. After the plurality of stator core punching sheets 11 are stacked, they are wrapped by the insulating frames to form a block assembly, and the plurality of block assemblies are arranged and combined along the circumferential direction to form a circular stator.

[0052] Specifically, M in this embodiment is 1, and the winding coil includes a first layer of enameled wire 311 , a second layer of enameled wire 312 , a third layer of enameled wire 313 and a fourth layer of enameled wire 314 .

[0053] Preferably, two adjacent enameled wires in the winding coil 31 are tangent to each other. With the structure of this embodiment, when the number of enameled wire layers LY2 is an even number, the number of enameled wire layers LYQ2 tangent to the bottom of the insulating frame 21 in the winding coil is 1+LY2 / 2 layers; when the number of enameled wire layers LY2 is an odd number, the number of enameled wire layers LYQ2 tangent to the bottom of the insulating frame 21 in the winding coil is 1+(LY2-1) / 2 layers.

[0054] Preferably, the half-slot area of ​​the stator core punching sheet 12 described in this embodiment is S2, the distance between the slot bottom and the slot shoulder is H2, the maximum distance between the bottom layer of enameled wire in the slot and the outermost layer of enameled wire is X2, the half-slot bottom length is L2, the minimum yoke thickness is Y2 (wherein the minimum yoke thickness should meet the magnetic density requirements and will not cause magnetic saturation and increased loss problems), the number of turns of the winding coil is N2, and the outer diameter of the enameled wire is D2, then the arrangement of the winding coil satisfies X2×H2≥D2×D2×N2, and the slot fill rate C2 satisfies C2=N2×D2×D2×π / (4×S2).

[0055] Figure 5 The diagram shows an existing insulating frame and motor stator core assembly structure, including an insulating frame 21 and a plurality of stator core punching sheets 11 stacked and arranged inside the insulating frame 21; wherein the insulating frame 21 and the stator core punching sheets 11 are both flat bottom slot parallel tooth structures, such as Figure 5 As shown, the frame slot bottom surface 211 of the insulating frame 21 and the frame tooth portion 215 as well as the core slot bottom surface 111 of the stator core punching sheet 11 and the core tooth portion 114 are all intersected and form a right angle.

[0056] Similarly, a winding coil 31 formed by enameled wire is wound on the skeleton tooth portion 215 of the insulating skeleton 21. The winding coil 31 generally includes multiple layers of enameled wire arranged from the inside to the outside. In order to maintain consistency, the winding coil is also arranged here to include a first layer of enameled wire 311, a second layer of enameled wire 312, a third layer of enameled wire 313 and a fourth layer of enameled wire 314, and two adjacent enameled wires in the winding coil 31 are arranged tangentially.

[0057] Similarly, in the existing insulation skeleton and motor stator core assembly structure, the half slot area is S1, the distance between the slot bottom and the slot shoulder is H1, the maximum distance between the bottom layer of enameled wire in the slot and the outermost layer of enameled wire is X1, the half slot bottom length is L1, the minimum yoke thickness is Y1, the number of winding coil turns is N1, the number of enameled wire layers is LY1, and the outer diameter of the enameled wire is D1. Then the arrangement of the winding coil satisfies X1×H1≥D1×D1×N1, and the slot fill rate C1 satisfies C1=N1×D1×D1×π / (4×S1).

[0058] like Figure 5 As shown, in the existing assembly structure, when the number of enameled wire layers LY1 is an even number, the number of enameled wire layers LYQ1 in the winding coil tangent to the bottom of the insulating skeleton 21 is LY1 / 2 layers; when the number of enameled wire layers LY1 is an odd number, the number of enameled wire layers LYQ1 in the winding coil tangent to the bottom of the insulating skeleton 21 is 1+(LY1-1) / 2 layers.

[0059] The enameled wire used in this embodiment is set to have the same specifications as the enameled wire of the existing assembly structure. The minimum yoke thickness Y2 in this embodiment is equal to the minimum yoke thickness Y1 of the existing assembly structure (that is, the magnetic flux density of the two at the minimum yoke thickness is equal under the same current). Figure 1 and Figure 5 By comparison, it can be seen that when the number of enameled wire layers LY2 in this embodiment is the same as the number of enameled wire layers LY1 in the existing assembly structure, this embodiment has one more turn in the even-numbered layers compared with the existing assembly structure, that is, when LY2 is the same as LY1 and is an even number, LYQ2-LYQ1=1, N2-N1=LY2 / 2 is satisfied; when LY2 is the same as LY1 and is an odd number, LYQ2-LYQ1=0, N2-N1=(LY2-1) / 2 is satisfied; at the same time, the slot fill rates C1 and C2 of the assembly structure in this embodiment and the existing assembly structure satisfy:

[0060]

[0061] It can be seen that the slot full rate of the assembly structure of this embodiment is higher than the slot full rate of the existing assembly structure.

[0062] The assembly structure in this embodiment has the following advantages:

[0063] See also Figure 1 and Figure 5 In the assembly structure of this embodiment, the contact area between the winding coil and the insulating frame is larger than that of the existing assembly structure, and the heat dissipation area of ​​the winding is larger, which can effectively reduce the temperature rise of the winding, thereby reducing the temperature rise of the motor assembly; at the same time, the winding structure is more stable and the vibration is smaller.

[0064] See also Figure 6When the number of enameled wire layers LY2 of the assembly structure of this embodiment and the number of enameled wire layers LY1 of the existing assembly structure satisfy LY1-LY2=1, N1=N2, the difficulty of winding the enameled wire can be reduced and the winding process can be simplified.

[0065] See also Figure 7 , when the number of turns N2 of the assembly structure of this embodiment and the number of turns N1 of the existing assembly structure satisfy N2-N1=2 and LY1=LY2 (i.e. Figure 1 and Figure 5 ), when the same torque of 2Nm is output at the same speed of 500rpm, the U-phase current peak value U1 of the existing assembly structure is 7.43A, and the U-phase current peak value U2 of the improved assembly structure in this embodiment is 7.14A, which is 3.9% lower than that of U1. The reduction in current can effectively reduce losses (copper losses are reduced by about 1.5%), effectively reduce the temperature rise of the winding, and at the same time reduce the temperature rise of the motor assembly.

[0066] See also Figure 8 , when the number of turns N2 of the assembly structure of this embodiment and the number of turns N1 of the existing assembly structure satisfy N2-N1=2 and LY1=LY2 (i.e. Figure 1 and Figure 5 When the same torque is output at the same speed of 500 rpm, the line current and winding loss of the improved assembly structure of this embodiment are significantly reduced compared with the existing assembly structure.

[0067] Embodiment 2:

[0068] The difference between this embodiment and embodiment 1 is that the value of M in this embodiment is equal to 2. Figure 9-11 In this embodiment, the insulating frame 21 has two transition connection surfaces 214 between the frame connection slope 212 and the frame tooth portion 215, and the stator core punching sheet 11 has two transition connection surfaces 113 between the core connection slope 112 and the core tooth portion 114. Fig. 9 As shown, when the number of enameled wire layers is also four, the number of enameled wire layers tangent to the bottom of the insulating skeleton 21 in this embodiment is greater, and the advantage over the existing assembly structure is more obvious. This embodiment can further increase the area inside the slot, thereby further increasing the slot fill rate.

[0069] Using the structural form of this embodiment, when the number of enameled wire layers LY2 is an even number, the number of enameled wire layers LYQ2 in the winding coil tangent to the bottom of the insulating skeleton 21 is 2+LY2 / 2 layers; when the number of enameled wire layers LY2 is an odd number, the number of enameled wire layers LYQ2 in the winding coil tangent to the bottom of the insulating skeleton 21 is 2+(LY2-1) / 2 layers.

[0070] According to Example 1 and Example 2, it can be concluded that the relationship between the number of enameled wire layers LYQ2 and M in the winding coil that are tangent to the bottom of the insulating skeleton 21 is: when the number of enameled wire layers LY2 is an even number, the number of enameled wire layers LYQ2 in the winding coil that are tangent to the bottom of the insulating skeleton 21 is M+LY2 / 2 layers; when the number of enameled wire layers LY2 is an odd number, the number of enameled wire layers LYQ2 in the winding coil that are tangent to the bottom of the insulating skeleton 21 is M+(LY2-1) / 2 layers. Combining Example 1 and Example 2, it can be known that when the value of M is larger, theoretically, the number of enameled wire layers tangent to the bottom of the insulating skeleton 21 is more, which can further increase the slot fill rate.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An insulating frame and motor stator core assembly structure, characterized in that: It comprises an insulating frame (21) and a plurality of stator core punching sheets (11) stacked and arranged inside the insulating frame (21); The insulating skeleton (21) is provided with a skeleton groove bottom surface (211), a skeleton connection inclined surface (212) and M transition connection surfaces (214) arranged in sequence, the skeleton groove bottom surface (211) and the skeleton connection inclined surface (212) are arranged to intersect, and the transition connection surface (214) at the head end and the skeleton tooth portion (215) of the insulating skeleton (21), between two adjacent transition connection surfaces (214), and between the transition connection surface (214) at the tail end and the skeleton connection inclined surface (212) are all connected via arc concave surfaces (213); The stator core punching sheet (11) is provided with a core slot bottom surface (111), a core connection inclined surface (112) and M transition connection surfaces (113) arranged in sequence; wherein: the core slot bottom surface (111) is arranged correspondingly to the skeleton slot bottom surface (211), the core connection inclined surface (112) is arranged correspondingly to the skeleton connection inclined surface (212), the transition connection surface (113) is arranged one by one with the transition connection surface (214), and the transition connection surface (113) at the head end is connected to the core tooth portion (114) on the stator core punching sheet (11), and the transition connection surface (113) at the tail end is connected to the core connection inclined surface (112); wherein M is a natural number greater than or equal to 1.

2. The insulating frame and motor stator core assembly structure according to claim 1 is characterized in that: A winding coil (31) formed of enameled wire is wound on the skeleton tooth portion (215) of the insulating skeleton (21), and the winding coil (31) includes a plurality of enameled wire layers arranged from the inside to the outside, wherein the innermost enameled wire layer is arranged tangentially to the skeleton tooth portion (215), and the outermost enameled wire layer is arranged at a position where the skeleton groove bottom surface (211) intersects with the skeleton connection inclined surface (212).

3. The insulating frame and motor stator core assembly structure according to claim 2 is characterized in that: The distance between the centers of two adjacent arc concave surfaces (213) is equal to the outer diameter of the enameled wire.

4. The insulating frame and motor stator core assembly structure according to claim 3 is characterized in that: The radius of the arc concave surface (213) is equal to the outer radius of the enameled wire.

5. The insulating frame and motor stator core assembly structure according to claim 4 is characterized in that: When the number of enameled wire layers LY2 is an even number, the number of enameled wire layers LYQ2 in the winding coil that are tangent to the bottom of the insulating frame (21) is M+LY2 / 2 layers; when the number of enameled wire layers LY2 is an odd number, the number of enameled wire layers LYQ2 in the winding coil that are tangent to the bottom of the insulating frame (21) is M+(LY2-1) / 2 layers.

6. The insulating frame and motor stator core assembly structure according to claim 2, characterized in that: Two adjacent enameled wires in the winding coil (31) are arranged tangentially.

7. The insulating frame and motor stator core assembly structure according to claim 1, characterized in that: The core slot bottom surface (111) and the core connection slope (112), the core connection slope (112) and the transition connection surface (113), two adjacent transition connection surfaces (113), and the transition connection surface (113) and the core tooth portion (114) are all arranged to intersect or are connected by arc surface transition.

8. The insulating frame and motor stator core assembly structure according to claim 1, characterized in that: The arc concave surface (213) and the skeleton connection inclined surface (212), the arc concave surface (213) and the second transition connection surface (214), and the arc concave surface (213) and the skeleton tooth portion (215) are all tangent to each other.

9. The insulating frame and motor stator core assembly structure according to any one of claims 1 to 8, characterized in that: The insulating frame (21) is a full-circular structure, and a plurality of frame teeth (215) are provided on the inner side thereof; both sides of the root of the frame teeth (215) are provided with a frame groove bottom surface (211), a frame connection inclined surface (212), and M transition connection surfaces (214) arranged in sequence; The stator core punching sheet (11) is also a full-circular structure, and a plurality of core teeth (114) are arranged on the inner side thereof. Both sides of the root of the core teeth (114) are provided with a core slot bottom surface (111), a core connection inclined surface (112) and M transition connection surfaces (113) arranged in sequence; The number of the skeleton teeth (215) is equal to the number of the core teeth (114).

10. The insulating frame and motor stator core assembly structure according to any one of claims 1 to 8, characterized in that: A plurality of stator core punching sheets (11) are stacked and then wrapped by an insulating frame (21) to form a block assembly, and the plurality of block assemblies are arranged along a circumferential direction to form a full-circular stator.

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