Stator core

Abstract

The utility model provides a stator iron core which is formed by arranging a plurality of iron core units, each iron core unit comprises an outer ring part, a winding support connected with the inner side of the outer ring part and an inner ring part connected with the inner end of the winding support, and the adjacent iron core units are connected through the outer ring parts; an external connection groove is formed in the outer side face of the outer ring part of at least one part of the iron core units, the external connection groove extends and penetrates through the upper end face and the lower end face of the outer ring part, the external connection groove comprises a groove bottom face and two limiting groove walls, an included angle is formed between the two limiting groove walls, and the distance between the two limiting groove walls is gradually reduced in the outer side direction of the outer ring part. The limiting groove wall is connected with the outer side face of the outer ring part to form a limiting part. According to the utility model, the outer side surface of the outer ring part is provided with the external connection groove with the limiting structure, and the external connection groove can be matched and fixed with the clamping teeth of the external connection parts, thereby improving the connection stability between the parts, and avoiding the interference of the vibration generated in the motor operation environment on the connection stability.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a stator core. Background Art

[0002] The stator core is an important component that constitutes the motor's magnetic flux circuit and fixes the stator coil. Its main function is to wind the coil on it to form a stator, so that it can match with the rotor to form a motor.

[0003] The stator core often needs to be assembled with a variety of other components in the motor structure. For example, the upper and lower end faces of the stator core need to be installed with insulating plates that are consistent with the shape of the stator core end faces, and the outer side of the stator core also needs to be installed with external components. Therefore, it is generally necessary to set up some corresponding structures to match these components. For example, the patent document with publication number CN212435446U discloses a new type of stator core, which includes a disc and a winding assembly connected to the inner side of the disc. An external groove for connecting to a component arranged at the end is provided on the end face of the winding assembly, and a third groove for connecting to a component arranged on the outer side is provided on the outer side of the disc. By providing the external groove and the third groove, the stator core can be more compatible with other components and the connection is more stable. Although the above technical solution improves the fit between the stator core and other components, there is still a problem of insufficient connection stability. For example, the third groove arranged on the outer side of the disk is a semicircular groove. The third groove and the external component can only be matched through the arc surface under radial external force. When the motor is in working state, a certain vibration is often generated. Once the external force fluctuates, the fit tightness between the external component and the stator core will also be affected. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a stator core, which can form a fixed connection with an external component through a limiting structure, and the connection stability is not easily affected by the vibration environment, thereby improving the stability of the motor during operation.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A stator core is formed by arranging a plurality of core units, wherein the core units include an outer ring portion, a winding support connected to the inner side of the outer ring portion, and an inner ring portion connected to the inner end of the winding support, and adjacent core units are connected via the outer ring portion; an external groove is formed on the outer side surface of the outer ring portion of at least a portion of the core units, the external groove extends through the upper end surface and the lower end surface of the outer ring portion, the external groove includes a groove bottom surface and two limiting groove walls arranged at an angle, the spacing between the two limiting groove walls gradually decreases in the outer direction of the outer ring portion, the limiting groove wall is connected to the outer side surface of the outer ring portion and forms a limiting portion.

[0007] The stator core provided by the utility model is provided with an external groove on the outer side surface of the outer ring part, and the external groove forms a limiting structure by two limiting groove walls arranged at an angle. When installing the external component, the latching teeth of the external component can be inserted into the inside of the external groove in cooperation. After the insertion, the latching teeth cannot radially escape from the external groove under the restriction of the limiting part, thereby realizing the fixed connection between the two without applying external force, and the latching teeth are easy to abut against each other with the limiting groove wall, so that the installation stability of the latching teeth in the external groove is improved.

[0008] Furthermore, a port portion is formed at the intersection of the external groove and the upper end surface or the lower end surface, and the port portion has two mating tongues and grooves, and the mating tongue and groove include a receiving table surface vertically connected to the end of the limiting groove wall and a mating side surface vertically connected to the receiving table surface, and the two receiving tables respectively located on the two mating tongues and grooves are arranged in the same plane, and the two mating side surfaces respectively located on the two mating tongues and grooves are arranged in parallel, and the spacing between the two mating side surfaces is greater than the spacing between the two limiting portions.

[0009] When installing the external component, the stator core provided by the utility model needs to insert the clamping tooth into the external groove from the upper end face or the lower end face of the outer ring part. In this way, it is inevitable that there will be a transition connecting the clamping tooth and the external component body protruding from the upper end face or the lower end face of the outer ring part, and insulating end plates usually need to be installed on the upper end face and the lower end face. If there is a protruding transition part, it may affect the installation of the insulating end plate to a certain extent. Therefore, the utility model provides a port part in a further implementation scheme, and the corner part can be embedded in the port part, and the two sides of the corner part are respectively abutted against the two matching side faces. When the shapes correspond, the inner corner surface of the corner part can also overlap the receiving table surface. Through the above scheme, the corner part no longer protrudes from the upper end face or the lower end face, which facilitates the installation of the end plate. At the same time, the two matching side faces can also limit the corner part to prevent the clamping tooth from rotating, thereby further improving the installation stability.

[0010] Furthermore, at least a portion of the outer ring portion of the core unit is provided with a positioning hole penetrating the upper end surface and the lower end surface.

[0011] Furthermore, a bending groove is provided between adjacent outer ring portions, and the bending groove forms an opening in the inner direction of the outer ring portion.

[0012] Furthermore, the bending groove includes an inner notch with arc side walls and an outer notch with a width gradually increasing in the opening direction.

[0013] Furthermore, the core units are arranged linearly, the outer ring end portion at the first end of the stator core is provided with a male connection portion, and the outer ring end portion at the second end of the stator core is provided with a female connection portion that can cooperate with the male connection portion.

[0014] Furthermore, the outer side of the outer ring portion forms an outer matching arc surface.

[0015] Furthermore, the inner ring portion forms an inner matching arc surface on a side away from the winding support.

[0016] Furthermore, the limiting groove wall and the groove bottom surface are connected through a rounded transition.

[0017] Furthermore, the positioning holes and the external slots are arranged on different core units.

[0018] In summary, the application of the utility model can achieve the following beneficial effects:

[0019] 1. The utility model provides an external connection groove with a limiting structure on the outer side of the outer ring part, and the external connection groove and the latching teeth of the external component can be matched and fixed to prevent the latching teeth from falling out toward the outside of the outer ring part, and there is no need to apply external force to connect the two, thereby improving the connection stability between the components, especially avoiding the interference of vibration generated in the motor operation environment on the connection stability.

[0020] 2. In some embodiments, a port portion is provided at the intersection of the external groove of the utility model and the upper end face or the lower end face. The port portion can embed the transition connection latch and the corner portion of the external component body to avoid the corner portion protruding from the upper end face or the lower end face, thereby facilitating the installation of the insulating end plate or other components. The mating tongue and groove of the port portion can also limit the corner portion to prevent the latch from rotating and loosening, thereby improving the connection stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a stator core in one embodiment;

[0022] Figure 2 It is a structural schematic diagram of the core unit;

[0023] Figure 3 for Figure 1 Schematic diagram of the winding structure of the stator core shown;

[0024] Figure 4 is a schematic diagram of the structure of an external component;

[0025] Figure 5 is a schematic structural diagram of an external slot in another embodiment;

[0026] Figure 6 for Figure 5 A schematic diagram of the matching structure of the external slot and the external component shown;

[0027] In the figure, 1-core unit, 11-outer ring part, 111-outer matching arc surface, 112-female connecting part, 113-male connecting part, 12-winding bracket, 13-inner ring part, 131-inner matching arc surface, 2-bending groove, 21-inner notch, 22-outer notch, 3-external groove, 31-slot bottom surface, 32-limiting groove wall, 33-limiting part, 34-matching tongue and groove, 341-receiving table, 342-matching side surface, 4-positioning hole, 5-external component, 51-main body, 52-clamp, 53-corner part. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0029] The embodiment of the first aspect of the utility model provides a structural schematic diagram of a stator core, such as Figure 1 and Figure 2 As shown, the stator core is formed by linearly connecting a plurality of core units 1, the core unit comprising an outer ring portion 11, a winding support 12 connected to the inner side of the outer ring portion, and an inner ring portion 13 connected to the inner end of the winding support, the outer side surface of the outer ring portion forms an outer matching arc surface 111, and the side of the inner ring portion away from the winding support forms an inner matching arc surface 131, adjacent core units are connected through the outer ring portion 11, and the end of the outer ring portion located at the first end of the stator core is formed with a female connection portion 113, and the end of the outer ring portion located at the second end of the stator core is formed with a male connection portion 114; refer to Figure 3 After the stator core is formed into a circular ring structure through the winding process, the female connecting part and the male connecting part can cooperate with each other and connect the stator core of the strip structure end to end. At this time, the outer matching arc surfaces 111 and the inner matching arc surfaces 131 are substantially in a cocircular state. Figure 3As a reference, the inner side and the outer side involved in the utility model refer to the side facing the center of the circle and the side away from the center of the circle; an external groove 3 is arranged on the outer side surface of the outer ring portion 11 of a part of the core unit of the stator core, and the external groove 3 extends in a direction perpendicular to the upper and lower end surfaces of the outer ring portion and passes through the upper and lower end surfaces of the outer ring portion, and the external groove includes a groove bottom surface 31 and two limiting groove walls 32 arranged at an angle, and the limiting groove walls are connected to the fillet of the groove bottom surface, and the two limiting groove walls gradually approach each other in the opening direction of the external groove, so that the external groove forms a shrinking structure from the inside to the outside, and a limiting portion 33 is formed at the junction of the limiting groove wall and the outer side surface of the outer ring portion, and the position of the limiting portion 33 is the position where the width of the external groove is the smallest. The stator core provided in this embodiment can form a self-fixing connection with the external component through the external groove. The external component can insert the clamp into the external groove from the upper and lower end surfaces of the outer ring part. The limiting part of the external groove can prevent the clamp from escaping from the external groove in the direction parallel to the upper and lower end surfaces, thereby achieving the above-mentioned effect.

[0030] Figure 4 The schematic diagram of the structure of an external component is shown, which includes a plate-shaped main body 51, a clamp 52 vertically connected to the side of the main body, and a corner portion 53 transitionally connecting the main body 51 and the clamp 52. Figure 2 When the outer groove is matched, the corner portion 53 will extend from the end of the outer groove and protrude relative to the upper and lower end surfaces of the outer ring portion. After the outer ring portion is wound into a ring, the upper and lower end surfaces usually need to be installed with insulating end plates. The protrusion formed by the corner portion will affect the installation of the insulating end plate to a certain extent. In this regard, the utility model provides the following Figure 5 Another stator core shown in the figure has a port portion formed at the junction of the external groove of the stator core and the upper end surface of the outer ring portion, and the port portion has two matching grooves 34, the matching grooves include a receiving table 341 vertically connected to the end of the limiting groove wall and a matching side surface 342 vertically connected to the receiving table surface, the receiving tables of the two matching grooves are arranged in the same plane, the matching side surfaces of the two matching grooves are arranged in parallel, and the spacing between the matching side surfaces is greater than the spacing between the two limiting portions 33; Figure 6 As shown, when the clamp head 52 cooperates with the external groove, the corner portion 53 can extend through the matching groove 34 formed by the port portion, and no protrusions are formed at the upper and lower ends of the outer ring portion, thereby avoiding affecting the installation of other external components. The matching side surface 342 can cooperate with the side edge of the corner portion and play a limiting role, thereby preventing the clamp head from rotating in the external groove, thereby further improving the installation stability.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A stator core, formed by arranging a plurality of core units, wherein the core units include an outer ring portion, a winding support connected to the inner side of the outer ring portion, and an inner ring portion connected to the inner end of the winding support, and adjacent core units are connected via the outer ring portion; an external groove is formed on the outer side surface of the outer ring portion of at least a portion of the core units, the external groove extends and passes through the upper end surface and the lower end surface of the outer ring portion, the external groove includes a groove bottom surface and two limiting groove walls arranged at an angle, the distance between the two limiting groove walls gradually decreases in the outer direction of the outer ring portion, the limiting groove wall is connected to the outer side surface of the outer ring portion and forms a limiting portion.

2. A stator core according to claim 1, characterized in that: The intersection of the external groove and the upper end surface or the lower end surface forms a port portion, and the port portion has two matching tongues and grooves, and the matching tongues and grooves include a receiving table surface vertically connected to the end of the limiting groove wall and a matching side surface vertically connected to the receiving table surface, and the two receiving tables respectively located on the two matching tongues and grooves are arranged in the same plane, and the two matching side surfaces respectively located on the two matching tongues and grooves are arranged in parallel, and the spacing between the two matching side surfaces is greater than the spacing between the two limiting portions.

3. A stator core according to claim 1, characterized in that: The outer ring portion of at least a portion of the core unit is provided with a positioning hole penetrating the upper end surface and the lower end surface.

4. A stator core according to claim 1, characterized in that: Bending grooves are arranged between adjacent outer ring parts, and the bending grooves are opened in the inner direction of the outer ring parts.

5. A stator core according to claim 4, characterized in that: The bending groove comprises an inner groove opening with arc side walls and an outer groove opening with a width gradually increasing in an opening direction.

6. A stator core according to claim 1, characterized in that: The core units are arranged linearly, the outer ring end portion at the first end of the stator core is provided with a male connection portion, and the outer ring end portion at the second end of the stator core is provided with a female connection portion that can cooperate with the male connection portion.

7. A stator core according to claim 1, characterized in that: The outer side of the outer ring portion forms an outer matching arc surface.

8. The stator core according to claim 1, characterized in that: The inner ring portion forms an inner matching arc surface on a side away from the winding support.

9. The stator core according to claim 1, characterized in that: The limiting groove wall and the groove bottom surface are connected through a rounded corner transition.

10. The stator core according to claim 3, characterized in that: The positioning holes and the external slots are arranged on different core units.

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