Stator frame, stator assembly and electric machine

Abstract

The present disclosure relates to a stator framework (1), a stator assembly and an electric machine. The stator framework (1) comprises a plurality of framework units (2) connected in succession along a stator framework circumferential direction (U), the framework units (2) being injection molded on a stator core block and comprising a framework yoke portion (3) and a framework tooth portion (4) connected with the framework yoke portion (3) through a framework winding portion (5); a first wire passing column (6) and a second wire passing column (7), wherein the first wire passing column (6) is arranged inside the stator framework radial direction (R) of a first end portion of the framework yoke portion (3) along the stator framework circumferential direction (U) and protrudes from an end face of the framework yoke portion (3) along the stator framework axial direction (A); the second wire passing column (7) is arranged inside the stator framework radial direction (R) of a second end portion of the framework yoke portion (3) along the stator framework circumferential direction (U) and protrudes from the end face of the framework yoke portion (3) along the stator framework axial direction (U).

Description

Technical Field

[0001] This disclosure relates to a stator frame, a stator assembly, and an electric motor. Background Technology

[0002] In the automated winding process of motor stators, especially for stator assemblies composed of straight stators, a process of winding first and then rolling is typically adopted. Among these processes, the design of the guide post structure on the stator frame is particularly critical, as its arrangement and dimensions directly affect the insulation performance of the windings and the long-term reliability of the motor.

[0003] In this regard, existing stator frames still have problems in practical applications, which can easily lead to insufficient safety distance between the enameled wires of adjacent windings and between the enameled wires and the iron core. That is, the creepage distance between the enameled wires on the stator frame and the stator iron core is insufficient, which may even affect the operation of the motor. Utility Model Content

[0004] This disclosure aims to provide a stator frame, a stator assembly, and a motor that at least partially solve the aforementioned problems.

[0005] The stator frame, stator assembly, and motor proposed in this disclosure overcome the aforementioned shortcomings by adopting the following technical features, thus solving the problems of insufficient insulation distance and structural strength in traditional lead-through post structures.

[0006] According to the first aspect of this disclosure, a stator frame is proposed.

[0007] The stator frame includes multiple frame units connected sequentially along the circumferential direction of the stator frame. Each frame unit is injection molded onto the stator core block and includes:

[0008] The skeleton yoke and the skeleton teeth are connected to the skeleton yoke through the skeleton winding part;

[0009] A first wire guide post and a second wire guide post are provided, wherein the first wire guide post is located radially inside the stator frame at a first end of the stator frame along the circumferential direction of the stator frame and protrudes from the end face of the stator frame yoke along the axial direction of the stator frame; the second wire guide post is located radially inside the stator frame at a second end of the stator frame along the circumferential direction of the stator frame and protrudes from the end face of the stator frame yoke along the axial direction of the stator frame.

[0010] The first wire guide post is provided with a first protrusion that protrudes radially inward from the frame yoke towards the stator frame, and the first protrusion is provided with a first radial protrusion that protrudes radially inward towards the stator frame; the second wire guide post is provided with a second protrusion that protrudes radially inward from the frame yoke towards the stator frame, and the second protrusion is provided with a second radial protrusion that protrudes radially inward towards the stator frame.

[0011] In some embodiments, starting from the innermost radial end of the stator core block between successively connected frame units, the first radial protrusion and the second radial protrusion protrude 30-40% radially inward from the starting point relative to the first protrusion.

[0012] In some embodiments, the first radial protrusion and the second radial protrusion protrude 37% radially inward from the starting point relative to the first protrusion towards the stator frame.

[0013] In some embodiments, the first protrusion is provided with a first circumferential protrusion protruding along the circumference of the stator frame; the second protrusion is provided with a second circumferential protrusion protruding along the circumference of the stator frame.

[0014] In some embodiments, interconnected skeleton units abut against each other via corresponding first and second circumferential protrusions.

[0015] In some embodiments, the stator frame is designed as a straight stator frame for forming the stator body by rolling.

[0016] In some embodiments, before the stator body is formed by rolling, the first circumferential protrusion and the second circumferential protrusion have a circumferential dimension in the range of 0.15 to 0.24 mm along the stator frame.

[0017] In some embodiments, after the stator body is formed by rolling, the first circumferential protrusion and the second circumferential protrusion abut against each other by an interference fit.

[0018] In some embodiments, after the stator body is formed by rolling, the first circumferential protrusion and the first projection have a combined dimension of 0.7 mm along the circumferential direction of the stator frame.

[0019] In some embodiments, the axial dimensions of the first radial protrusion and the second radial protrusion are greater than or equal to the axial dimension of the stator core block.

[0020] According to a second aspect of this disclosure, a stator assembly is proposed having a stator frame according to a first aspect of this disclosure.

[0021] According to a third aspect of this disclosure, an electric motor is proposed, characterized in that the electric motor has a stator assembly according to a second aspect of this disclosure.

[0022] The embodiments of this disclosure will be described in more detail below with reference to the accompanying drawings, so that the features and advantages of this disclosure can be readily understood. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments of this disclosure will be briefly described below. The drawings are merely illustrative of some embodiments of this disclosure and are not intended to limit all embodiments of this disclosure to them.

[0024] Figure 1 A partial view of the stator frame according to this disclosure after being rolled up is shown in the axial direction of the stator frame.

[0025] Figure 2 This shows the axial direction of the stator frame. Figure 1 The stator frame shown is a partial view and a magnified view before it is rolled up;

[0026] Figure 3 A perspective view of the adjacent skeleton unit connection area of ​​the stator skeleton according to the present disclosure is shown before rolling.

[0027] Figure 4 It shows Figure 2 The magnified area shown is a three-dimensional view after being rolled up;

[0028] Figure 5 A partial dimensional schematic diagram of the connection region between adjacent frame elements of a stator frame according to the present disclosure is shown.

[0029] List of reference numerals

[0030] 1. Stator frame

[0031] 2 skeleton units

[0032] 3. Skeletal yoke

[0033] 4. Skeletal teeth

[0034] 5. Wire winding section

[0035] 6 First Crossing Post

[0036] 61 First protrusion

[0037] 611 First radial protrusion

[0038] 612 First week towards the protrusion

[0039] 7 Second Crossing Post

[0040] 711 Second radial protrusion

[0041] 712 Second week towards the protrusion

[0042] 8 enameled wire

[0043] 9 iron cores

[0044] A stator frame axial

[0045] U-stator frame circumferential direction

[0046] R stator frame radial Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0048] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this disclosure may have fewer components, other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0049] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this patent application specification do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not necessarily indicate a quantity limitation. The terms “comprising” or “including” and similar terms mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, which may change accordingly when the absolute position of the described object changes.

[0050] Figure 1 A partial view of the stator frame according to this disclosure after being rolled up is shown along the stator frame axis A, wherein the stator frame axis A is a direction perpendicular to the plane of the paper, and the stator frame circumferential U and stator frame radial R are also shown based on this.

[0051] The stator frame 1 includes multiple frame units 2 that are connected sequentially along the circumferential direction U of the stator frame. Figure 1Only some of them are shown in the diagram. The frame unit 2 is integrally injection molded onto the stator core block. A single frame unit 2 includes a frame yoke 3 on the outside along the radial direction R of the stator frame and a frame tooth 4 on the inside along the radial direction R of the stator frame. The frame tooth 4 is connected to the frame yoke 3 through a frame winding portion 5. The enameled wire 8 of the winding can be wound on the frame winding portion 5.

[0052] The stator frame 1 can be designed as a straight stator frame for forming the stator body by rolling. Figure 1 The stator frame 1 shown is already in a rolled state. Of course, the enameled wire 8 of the winding can have been wound on the frame winding part 5 before this. Figure 2 The image shows the state of the stator frame 1 before it is rolled up, where multiple frame units 2 can be clearly seen to be connected to each other at the radially outer corner of the frame yoke 3, while the frame teeth 4 remain separated from each other.

[0053] Figure 1 The diagram also shows the first pass post 6 and the second pass post 7. Figure 1 The axial view shows the axial end faces of the first guide post 6 and the second guide post 7. The following description can be found in the appendix. Figure 3 The first guide post 6 is located on the inner side of the stator frame radially R at the first end of the stator frame along the circumferential direction U of the stator frame and protrudes from the end face of the stator frame yoke 3 along the axial direction A of the stator frame; the second guide post 7 is located on the inner side of the radially R of the stator frame at the second end of the stator frame along the circumferential direction U of the stator frame and protrudes from the end face of the stator frame yoke 3 along the axial direction A of the stator frame. When multiple frame units 2 are successively connected along the circumferential direction U of the stator frame and rolled into a stator frame, the first guide post 6 of one frame unit 2 is adjacent to the second guide post 7 of another frame unit 2.

[0054] like Figure 4 As seen, a first protrusion 61 protruding from the frame yoke 3 toward the inner radial direction R of the stator frame is provided from the first wire guide post 6; a second protrusion 71 protruding from the frame yoke 3 toward the inner radial direction R of the stator frame is provided from the second wire guide post 7. The first protrusion 61 and the second protrusion 71 extend on the edge of the frame yoke 3.

[0055] The first protrusion 61 is provided with a first radial protrusion 611 protruding radially inward toward the stator frame; the second protrusion 71 is provided with a second radial protrusion 711 protruding radially inward toward the stator frame. Taking the innermost radial end E of the stator core block between the successively connected frame units as the starting point, the first radial protrusion 611 and the second radial protrusion 711 protrude 30-40% radially inward toward the stator frame relative to the first protrusion 61 from the starting point. By providing the first radial protrusion 611 and the second radial protrusion 711 on the first protrusion 61 and the second protrusion 71 respectively, the degree of radial protrusion of the corresponding protrusion is increased, thereby increasing the creepage distance from the winding enameled wire to the stator core, preventing creepage and insulation breakdown.

[0056] In the above design, the first radial protrusion 611 and the second radial protrusion 711 protrude 37% radially inward toward the stator frame relative to the radial dimension of the first protrusion 61. By accurately calculating the winding spacing and operating voltage, the protrusion height of the first radial protrusion 611 and the second radial protrusion 711 is increased by approximately 37%. For example, the radial dimension of the first protrusion 61 can be 1.32 mm, and the first radial protrusion 611 and the second radial protrusion 711 protrude 37% radially inward toward the stator frame, ultimately reaching approximately 1.81 mm. This ensures that after the stator frame is rolled, the first radial protrusion 611 and the second radial protrusion 711 can fully extend between the enameled wires 8 of adjacent windings. This design increases the creepage distance between the enameled wire 8 of the windings and the iron core 9, effectively preventing insulation breakdown or creepage phenomena that may occur under operating conditions.

[0057] from Figure 5 As can be clearly seen, the first protrusion 61 is provided with a first circumferential protrusion 612 protruding along the circumferential direction U of the stator frame; the second protrusion 71 is provided with a second circumferential protrusion 712 protruding along the circumferential direction U of the stator frame. The first circumferential protrusion 612 and the second circumferential protrusion 712 respectively increase the circumferential width of the first protrusion 61 and the second protrusion 71, so that the gap after the stator frame is rolled up is minimized.

[0058] The interconnected skeleton units 2 abut against each other through the corresponding first circumferential protrusion 612 and second circumferential protrusion 712, thereby avoiding gaps in local areas, increasing the creepage distance between the winding and the iron core, avoiding insulation breakdown or creepage, improving the overall mechanical strength of the structure, and thus effectively resisting mechanical vibrations during motor operation.

[0059] Before the stator body is formed by rolling, the first circumferential protrusion 612 and the second circumferential protrusion 712 have a dimension in the circumferential direction U of the stator frame in the range of 0.15 to 0.24 mm.

[0060] After the stator body is formed by rolling, the first circumferential protrusion 612 and the second circumferential protrusion 712 abut against each other by interference fit.

[0061] After the stator body is formed by rolling, the first circumferential protrusion 612 and the first protrusion 61 together have a dimension L1 of 0.7 mm along the circumferential direction U of the stator frame. Through the interference fit, the circumferential width of the first circumferential protrusion 612 and the second circumferential protrusion 712 is 0.2 mm, which can fill the gap L3 between them (e.g. Figure 5 As shown in the diagram, the diameter is typically around 0.2 mm. This allows the first circumferential protrusion 612 and the second circumferential protrusion 712 to make close contact in the circumferential direction, completely eliminating the gap problem that exists in the contact area in conventional structures.

[0062] Depend on Figure 1 and Figure 2 It can be clearly seen that the first protrusion 61 and the second protrusion 71 of two adjacent skeleton units 2 that are in contact with each other, or their corresponding radial protrusions and axial protrusions, are mirror-symmetrical with respect to the contact surface.

[0063] Figure 3 As can be seen, the axial dimensions of the first radial protrusion 611 and the second radial protrusion 711 can be equal to or extend beyond the lead post and are greater than the axial dimension of the stator core block.

[0064] Figure 5 The diagram shows the dimensions of the contact area between the first protrusion 61 and the second protrusion 71 after the stator body is formed by rolling. Here, L2 represents the circumferential dimension of the first protrusion 61 and the second protrusion 71, and L3 represents the gap width between them.

[0065] A stator assembly can be constructed using the stator frame 1, overcoming the aforementioned problems existing in the prior art. Furthermore, this stator assembly can be used to construct a motor with corresponding advantages.

[0066] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to the embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure.

Claims

1. A stator frame (1), characterized in that, The stator frame (1) includes multiple frame units (2) connected sequentially along the circumferential (U) direction of the stator frame. The frame units (2) are injection molded onto the stator core block and include: The skeleton yoke (3) and the skeleton tooth (4) are connected to the skeleton yoke (3) through the skeleton winding part (5); The first wire guide post (6) and the second wire guide post (7) are provided, wherein the first wire guide post (6) is disposed on the inner side of the stator frame radially (R) at the first end of the stator frame along the circumferential direction (U) of the stator frame and protrudes from the end face of the stator frame yoke (3) along the stator frame axial direction (A); the second wire guide post (7) is disposed on the inner side of the stator frame radially (R) at the second end of the stator frame along the circumferential direction (U) of the stator frame and protrudes from the end face of the stator frame yoke (3) along the stator frame axial direction (A). A first protrusion (61) is provided on the first wire guide post (6) protruding from the skeleton yoke (3) toward the inner side of the stator skeleton in the radial direction (R), and a first radial protrusion (611) protruding in the radial direction (R) of the stator skeleton is provided on the first protrusion (61); a second protrusion (71) is provided on the second wire guide post (7) protruding from the skeleton yoke (3) toward the inner side of the stator skeleton in the radial direction (R), and a second radial protrusion (711) protruding in the radial direction (R) of the stator skeleton is provided on the second protrusion (71).

2. The stator frame (1) according to claim 1, characterized in that, Starting from the innermost radial end (E) of the stator core block between the successively connected skeleton units, the first radial protrusion (611) and the second radial protrusion (711) protrude 30-40% radially inward from the starting point relative to the first protrusion (61) towards the inner radial (R) side of the stator skeleton.

3. The stator frame (1) according to claim 2, characterized in that, The first radial protrusion (611) and the second radial protrusion (711) protrude 37% radially inward from the starting point relative to the first protrusion (61) towards the stator frame radially (R).

4. The stator frame (1) according to claim 1, characterized in that, The first protrusion (61) is provided with a first circumferential protrusion (612) protruding along the circumferential (U) direction of the stator frame; the second protrusion (71) is provided with a second circumferential protrusion (712) protruding along the circumferential (U) direction of the stator frame.

5. The stator frame (1) according to claim 4, characterized in that, The interconnected skeleton units (2) abut against each other through corresponding first circumferential protrusions (612) and second circumferential protrusions (712).

6. The stator frame (1) according to claim 5, characterized in that, The stator frame is designed as a straight stator frame for forming the stator body by rolling.

7. The stator frame (1) according to claim 6, characterized in that, Before the stator body is formed by rolling, the first circumferential protrusion (612) and the second circumferential protrusion (712) have a dimension in the circumferential direction (U) of the stator skeleton in the range of 0.15 to 0.24 mm.

8. The stator frame (1) according to claim 7, characterized in that, After the stator body is formed by rolling, the first circumferential protrusion (612) and the second circumferential protrusion (712) abut against each other by interference fit.

9. The stator frame (1) according to claim 8, characterized in that, After the stator body is formed by rolling, the first protrusion (61) and the first circumferential protrusion (612) have a combined dimension of 0.7 mm along the circumferential (U) direction of the stator frame.

10. The stator frame (1) according to claim 1, characterized in that, The axial dimensions of the first radial protrusion (611) and the second radial protrusion (711) are greater than or equal to the axial dimensions of the stator core block.

11. A stator assembly, characterized in that, The stator assembly has a stator frame (1) according to any one of claims 1 to 10.

12. An electric motor, characterized in that, The motor has a stator assembly as described in claim 11.

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