Stator core fastening structure

Abstract

The utility model discloses a stator core fastening structure, comprising a plurality of stator punching sheets, ventilation slot plates superposed between two adjacent stator punching sheets, and stator pressing rings arranged at two axial ends of the plurality of stator punching sheets, n first notches are arranged in the circumferential direction of the stator punching sheets, and n second notches are arranged in the circumferential direction of the stator punching sheets. N second notches are formed in the circumferential direction of the ventilation slot plate, n third notches are formed in the circumferential direction of the stator pressing ring, and the corresponding first notches, second notches and third notches are combined to form welding slots for accommodating welding ribs; the welding groove comprises a first groove part and a second groove part which are arranged from inside to outside, the first groove part is matched with the welding rib, and a gap for containing welding flux is formed between the welding rib and the second groove part. The stator core fastening structure provided by the utility model can improve the welding precision and strength, thereby improving the performance of a motor.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and particularly relates to a stator core fastening structure. Background Art

[0002] The stator core is the main component of the motor and an important part of the motor magnetic circuit. When the motor is running, the stator core will be subjected to the combined effects of mechanical force, thermal stress and electromagnetic force. Therefore, the fastening structure and manufacturing process of the stator core will directly affect the overall performance of the motor, namely: efficiency, temperature rise, vibration and noise, etc.

[0003] Currently, the commonly used stator core fastening structures include: V-groove welding type, buckle type and welded rib structure type.

[0004] like Figure 1 As shown, the V-groove welding type: n V-grooves 101 are processed on the stator punching sheet 100 and the stator pressing ring. When manufacturing the stator core, the V-groove 101 is fully welded, and the stator core is fastened by n welds. The weld strength is low and it is easy to crack, resulting in looseness between the sheets, which affects the efficiency of the motor.

[0005] like Figure 2 As shown, the buckle type: n buckle slots 102 are processed on the stator punching sheet 100, the stator ventilation slot plate and the stator pressure ring. The stator core is fixed by the tight fit of n buckles 200 (the buckle 200 is generally a 3mm steel plate) and the buckle slots 102. The two ends of the buckle 200 grow out of the stator core, and the buckle 200 is folded to the two end surfaces of the stator pressure ring and then welded firmly. When the core volume increases, the weld strength and the buckle 200 strength both show a downward trend. If there are welding defects, the weld may crack, causing the core to bend and deform, lose the fastening force, and make the gap between the stator punching sheet 100 of the stator core larger, and the stiffness of the entire stator core becomes worse, affecting the overall performance of the motor, and also reducing the stability and reliability of the motor.

[0006] like Figure 3 As shown, the welding rib structure type: n stator ribs are evenly distributed around the circumference, tangent to the stator punching sheet 100 and the stator pressure ring 300, and welding is performed between the welding rib 400 and the gap between the stator punching sheet 100 and the stator pressure ring 300. When the welding rib 400 is welded, the accuracy is low, which affects the assembly accuracy. In addition, the welding rib 400 is in line contact with the stator core, and the contact area is small. Since the motor is affected by various forces for a long time during operation, the stability is poor.

[0007] In order to solve the above problems, the present utility model is provided. Utility Model Content

[0008] The utility model aims to provide a stator core fastening structure, which increases the strength and rigidity of the stator core and improves the manufacturing precision of the stator core.

[0009] Based on the above problems, the technical solution provided by the utility model is:

[0010] A stator core fastening structure comprises a plurality of stator punching sheets, a ventilation slot plate stacked between two adjacent stator punching sheets, and a stator pressing ring arranged at both axial ends of the plurality of stator punching sheets.

[0011] The stator punching sheet is provided with n first notches on the circumference, the ventilation slot plate is provided with n second notches on the circumference, and the stator pressing ring is provided with n third notches on the circumference, and the corresponding first notches, second notches and third notches are combined into a welding groove for accommodating welding ribs;

[0012] The welding groove includes a first groove portion and a second groove portion arranged from the inside to the outside, the first groove portion matches the welding rib, and a gap for accommodating solder is provided between the welding rib and the second groove portion.

[0013] In some embodiments, the welding rib is a long strip structure, and the first groove portion is a rectangular groove adapted to the bottom end of the welding rib.

[0014] In some embodiments, the second groove portion is gradually expanded from the inside to the outside.

[0015] In some embodiments, the second groove portion is a trapezoidal groove.

[0016] In some embodiments, the second groove portion has a depth three times that of the first groove portion.

[0017] In some embodiments, the angle between the side wall of the second groove portion and the side wall of the first groove portion is 45-55°.

[0018] Compared with the prior art, the advantages of the utility model are:

[0019] Welding grooves for accommodating welding ribs are provided on the stator punching sheets, ventilation slot plates and stator pressure rings. The welding grooves can position the welding ribs and at the same time have gaps between the welding ribs for accommodating solder, which can increase the contact area between the welding ribs and the stator, improve the welding accuracy and strength, and thus improve the performance of the entire motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. The drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1It is a structural schematic diagram of a V-groove welding type stator core fastening structure in the prior art;

[0022] Figure 2 It is a structural schematic diagram of a clip-type stator core fastening structure in the prior art;

[0023] Figure 3 It is a structural schematic diagram of a stator core fastening structure of a welded rib structure type in the prior art;

[0024] Figure 4 This is one of the structural schematic diagrams of an embodiment of a stator core fastening structure of the utility model;

[0025] Figure 5 This is the second structural diagram of the embodiment of the utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the welding groove in the embodiment of the utility model;

[0027] Figure 7 for Figure 6 The local enlarged view of point I in the middle;

[0028] in:

[0029] 100, stator punching sheet; 101, V-shaped groove; 102, buckle plate groove; 200, buckle plate; 300, stator pressure ring; 400, welding rib;

[0030] 1. Stator punching;

[0031] 2. Ventilation slot plate;

[0032] 3. Stator pressure ring;

[0033] 4. Welding reinforcement;

[0034] 5. Welding groove; 5-1. First groove portion; 5-2. Second groove portion. DETAILED DESCRIPTION

[0035] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the utility model and are not limited to the scope of the utility model. The implementation conditions used in the examples can be further adjusted according to the conditions of the specific manufacturer, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0036] like Figure 4 and Figure 5 As shown, it is a structural schematic diagram of an embodiment of the utility model, which provides a stator core fastening structure, including a plurality of stator punching sheets 1, a ventilation slot plate 2 stacked between two adjacent stator punching sheets 1, and a stator pressing ring 3 arranged at both axial ends of the plurality of stator punching sheets 1.

[0037] In order to facilitate the fastening and connection between the stator punching sheet 1, the ventilation slot plate 2 and the stator pressure ring 3, n first slots are provided in the circumferential direction of the stator punching sheet 1, n second slots are provided in the circumferential direction of the ventilation slot plate 2, and n third slots are provided in the circumferential direction of the stator pressure ring 3. The corresponding first slots, second slots and third slots are combined into a welding slot 5 for accommodating the welding rib 4.

[0038] like Figure 6 and Figure 7 As shown, the welding groove 5 includes a first groove portion 5-1 and a second groove portion 5-2 arranged from the inside to the outside, wherein the first groove portion 5-1 matches the welding rib, and there is a gap for accommodating the solder between the welding rib 4 and the second groove portion 5-2, that is, the welding rib 4 is positioned in the first groove portion 5-1, and the stator punching sheet 1, the ventilation slot plate 2 and the stator pressure ring 3 are fixedly connected by the weld between the welding rib 4 and the second groove portion 5-2.

[0039] In this example, the welding rib 4 is a long strip structure, and correspondingly, the first groove portion 5-1 is a rectangular groove adapted to the bottom end of the welding rib 4. The welding rib can be positioned in the welding groove 5 through the first groove portion 5-1, thereby improving the assembly accuracy of the stator punching sheet 1, the ventilation groove plate 2 and the stator pressure ring 3.

[0040] The second groove 5-2 is gradually expanded from the inside to the outside. Specifically, the second groove 5-2 is a trapezoidal groove. Preferably, the depth of the second groove 5-2 is three times that of the first groove 5-1, and the angle between the side wall of the second groove 5-2 and the side wall of the first groove 5-1 is 45-55°. During welding, the solder can be accommodated in the gap between the welding rib 4 and the second groove 5-2, forming a weld between the welding rib 4 and the side wall of the second groove 5-2, thereby improving the welding accuracy and strength.

[0041] In summary, the stator core fastening structure can position the welding ribs, increase the contact area between the welding ribs and the stator, improve the welding accuracy and strength, and thus improve the performance of the motor.

[0042] The above examples are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A stator core fastening structure, comprising a plurality of stator punching sheets, a ventilation slot plate stacked between two adjacent stator punching sheets, and a stator pressing ring arranged at both axial ends of the plurality of stator punching sheets, characterized in that: The stator punching sheet is provided with n first notches on the circumference, the ventilation slot plate is provided with n second notches on the circumference, and the stator pressing ring is provided with n third notches on the circumference, and the corresponding first notches, second notches and third notches are combined into a welding groove for accommodating welding ribs; The welding groove includes a first groove portion and a second groove portion arranged from the inside to the outside, the first groove portion matches the welding rib, and a gap for accommodating solder is provided between the welding rib and the second groove portion.

2. The stator core fastening structure according to claim 1, characterized in that: The welding rib is a long strip structure, and the first groove portion is a rectangular groove adapted to the bottom end of the welding rib.

3. The stator core fastening structure according to claim 2, characterized in that: The second groove portion is gradually expanded from the inside to the outside.

4. The stator core fastening structure according to claim 3, characterized in that: The second groove portion is a trapezoidal groove.

5. The stator core fastening structure according to claim 4, characterized in that: The second groove portion has a depth three times that of the first groove portion.

6. The stator core fastening structure according to claim 5, characterized in that: An included angle between a side wall of the second groove portion and a side wall of the first groove portion is 45-55 degrees.

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