Motor stator core structure and winding notch processing method thereof

Abstract

The invention relates to a motor stator core structure and a winding notch processing method thereof, the stator core structure is matched with a winding to form a stator assembly, the stator core structure comprises an iron core winding notch, the iron core winding notch is provided with a chamfering structure at the contact part of two end parts of the iron core winding notch along the height direction of a stator core and the winding, and the chamfering structure is arranged on the winding. The chamfer structure is a bevel angle or fillet structure used for protecting insulation of the enameled wire in the winding process. Compared with the prior art, the winding structure has the advantages that the winding can be directly performed on the stator core under the condition of not adding extra parts such as an insulating framework, the cost is reduced, the winding slot fullness rate and the motor performance are improved, and the like.

Description

Technical Field

[0001] The invention relates to a motor, in particular to a motor stator core structure and a winding slot processing method thereof. Background Art

[0002] The existing technology generally includes the following methods for processing stator core winding slots:

[0003] Since the sharp angle of the notch of the last stator punching sheet cannot be processed when stamping and riveting, in order to ensure reliable insulation of the core winding, the motor core in the industry currently needs to be insulated before winding. Conventional core insulation includes an insulating frame solution, a stator core insulation paper solution and an insulation solution for the core by injection molding. After searching, Chinese Patent Publication No. CN221467468U discloses a motor insulation skeleton structure, including an insulating skeleton connected to the core, three three-phase terminals are provided on the insulating skeleton, the insulating skeleton is annular, at least two guide positioning columns are evenly distributed on the top of the insulating skeleton, three terminal fixing grooves for fixing the three-phase terminals are provided on the insulating skeleton, and six wire rack teeth are connected to the inner side of the insulating skeleton; At that time, Chinese patent publication number CN221767806U disclosed a stator core insulation paper quick-insertion structure, including an upper frame and a lower frame, an inner tooth portion of the stator core, slot paper is arranged between adjacent teeth, a first protrusion device is arranged along the inner wall periphery of the upper frame, and a second protrusion device is arranged along the inner wall periphery of the lower frame. The first protrusion device includes a first protrusion and a second protrusion, and first bosses are symmetrically arranged on both sides of each second protrusion. The first boss is arranged above the tooth portion, and the height value of the first boss is smaller than the height value of the second protrusion, and the thickness value of the first boss is smaller than the thickness value of the second protrusion. A side plane of the first boss close to the inner wall of the upper frame and a side plane of the second protrusion close to the inner wall of the upper frame are in an overlapping state, and phase-isolating paper is arranged in each slot paper.

[0004] The above-mentioned prior art solution has two problems. On the one hand, the end insulation height increases the height of the entire core assembly. On the other hand, the thickness of the insulation layer in the slot is ≥0.25mm, which affects the slot fill rate of the core winding, increases the copper loss of the motor, and reduces the motor performance, especially for miniaturized, high power density motor stators. The impact is particularly serious.

[0005] Therefore, how to design a solution that can not only solve the problem of sharp contact angles piercing the enameled wire, but also solve the problem of insulation thickness has become a technical problem that needs to be solved. Summary of the invention

[0006] The purpose of the present invention is to provide a motor stator core structure and a winding slot processing method thereof in order to overcome the defects of the above-mentioned prior art.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] According to one aspect of the present invention, a motor stator core structure is provided, which cooperates with a winding to form a stator assembly, and the stator core structure includes a core winding slot, and the core winding slot is provided with a chamfered structure at the position where the two ends along the height direction of the stator core contact the winding, and the chamfered structure is an oblique or rounded structure for protecting the insulation of the enameled wire during the winding process.

[0009] As a preferred technical solution, part or all of the core winding slots are provided with an insulating protective layer.

[0010] As a preferred technical solution, the insulating protective layer is an insulating protective layer obtained by electrophoretic coating, insulating material spraying, insulating material dipping, or insulating coating.

[0011] As a preferred technical solution, the chamfered structure is a chamfered structure obtained by removing sharp edges.

[0012] As a preferred technical solution, an insulating skeleton is used at the end of the stator core structure.

[0013] As a preferred technical solution, the stator core structure is an integral structure or a block structure.

[0014] As a preferred technical solution, the stator core of the block structure is assembled into an integral structure by laser welding, or glue pouring, or a combination of laser welding and glue pouring.

[0015] According to another aspect of the present invention, a method for processing winding slots for the motor stator core structure is provided, wherein the method removes sharp edges of the positions where the two ends of the core winding slots in the core height direction contact the windings, forming bevels or rounded corners of a set size to protect the insulation of the enameled wire during the winding process.

[0016] As a preferred technical solution, after removing the sharp edges, the method further performs insulation treatment on part or all of the core winding slots, wherein the insulation treatment adopts electrophoretic coating or insulating material spraying or insulating material dipping or insulating coating to form an insulating protective layer on part or all of the stator core winding slots.

[0017] As a preferred technical solution, the sharp edge removal process adopts laser processing, mechanical processing or corrosion processing.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1) The present invention removes sharp burrs and adds chamfers to the last punching sheet of the winding slot of the iron core, and performs insulation treatment such as electrophoresis or coating. The minimum thickness of the insulation layer can reach 0.01 mm or even less. The thickness of the insulation layer is designed according to the insulation requirements;

[0020] 2) The present invention can not only solve the problem of sharp contact angles piercing the enameled wire, but also solve the problem of insulation thickness. Without adding additional structures such as an insulation skeleton, it ensures that the withstand voltage insulation meets the requirements, thereby greatly improving the full rate of the motor stator winding slots. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the split stator core before the winding slot is chamfered;

[0022] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of part B;

[0023] Figure 3 It is a schematic diagram of the structure of the split stator core of the present invention after the winding slots are chamfered;

[0024] Figure 4 for Figure 3 A schematic diagram of the enlarged structure of part A;

[0025] Figure 5 This is a schematic diagram of the winding after the sharp edges of the two ends of the core in the height direction and the contact parts with the winding are removed and the slots are insulated;

[0026] Figure 6 This is a schematic diagram of the split core being wound and then assembled into a full circle;

[0027] Figure 7 A schematic diagram of the integral iron core being filled with glue after winding according to the present invention;

[0028] Figure 8 It is a structural schematic diagram of the chamfering of winding slots of the split-type stator core of the present invention;

[0029] Fig. 9 It is a structural schematic diagram of the chamfering of the winding slots of the integral stator core of the present invention.

[0030] Among them, 1 is the winding slot before chamfering, 2 is the chamfering structure, 3 is the winding, 4 is the integral stator core, 5 is the integral core after glue filling, 6 is the upper end punching sheet, 7 is the core winding slot, 8 is the lower end punching sheet, 61 is the stator yoke, and 62 is the stator tooth. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0032] Example 1

[0033] like Figure 3 and 4 As shown, a motor stator core structure, which cooperates with a winding to form a stator assembly, the stator core structure includes a core winding slot 7, and the core winding slot is provided with a chamfered structure 2 at the position where the two ends along the stator core height direction contact the winding. The chamfered structure 2 is an oblique or rounded structure for protecting the insulation of the enameled wire during the winding process. After partial or full insulation treatment is performed on the stator winding slot position, additional components such as an insulating skeleton and insulating paper can be omitted, thereby ensuring good insulation performance while increasing the effective winding space, improving the winding slot full rate, reducing costs, and improving the performance of the motor.

[0034] Part or all of the core winding slots are provided with an insulating protective layer, and the insulating protective layer is an insulating protective layer obtained by electrophoretic coating, insulating material spraying, insulating material dipping, or insulating coating.

[0035] The chamfered structure is a chamfered structure obtained by removing sharp edges.

[0036] The stator core structure end may adopt an insulating frame or may not adopt an insulating frame.

[0037] The stator core structure is an integral structure or a block structure. The core is wound. If the core is an integral structure, the winding is integral winding; if the core is a block structure, a single core can be wound and then assembled into an integral core, or multiple cores can be wound and then assembled into an integral core. The block cores can be assembled into an integral structure by laser welding, glue pouring, or laser and glue pouring integration.

[0038] The motor stator core structure of the present invention can be directly wound on the stator core without adding additional components such as an insulating frame, thereby reducing costs and improving the winding slot fill rate and motor performance.

[0039] Example 2

[0040] This embodiment is used for the winding slot processing method of the motor stator core structure described in Example 1. This method removes the sharp edges of the positions where the two ends of the core winding slot in the core height direction contact the windings, forming a set size of bevel or fillet to protect the insulation of the enameled wire during the winding process.

[0041] After the sharp edge removal process is performed, the method further performs insulation treatment on part or all of the core winding slots, wherein the insulation treatment adopts the method of electrophoresis coating, insulation material spraying, insulation material dipping or insulation coating to form an insulation protection layer on part or all of the stator core winding slots. The sharp edge removal process adopts laser processing, mechanical processing or corrosion processing.

[0042] As attached Figure 3 and Figure 4 As shown in FIG. 1 , due to the chamfering design of the positions of both ends of the stator core winding slot in the core height direction, it can be seen that Figure 8 and Fig. 9 Schematic diagram of chamfering, removing the sharp corners produced when punching the sheet (see the schematic diagram before chamfering design Figure 1 and Figure 2 ).

[0043] On this basis, the winding slots of the core are partially or completely insulated, and winding can be implemented directly. While ensuring the insulation design, the winding slot fill rate is greatly improved, reducing costs while improving the performance of the motor.

[0044] Figure 5 The sharp edges of the two ends of the core in the height direction and the contact parts of the winding are removed, and the winding diagram after the slot is insulated. The scheme mentioned in the present invention can avoid damage to the enameled wire and ensure the durability and insulation properties of the enameled wire; Figure 6 The split iron core is wound and then assembled into a whole circle. Here, the split iron core is taken as an example. If it is an integral iron core, it can be wound according to the scheme of the present invention without the need to assemble the whole into a circle. Figure 7 According to the present invention, the integral iron core is filled with glue after winding, and the entire iron core has better assemblability after filling with glue. Of course, the integral iron core formed by assembling the split iron core and the non-split integral iron core can also be processed without filling with glue.

[0045] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A motor stator core structure, which cooperates with a winding to form a stator assembly, characterized in that: The stator core structure includes a core winding slot, and the core winding slot has chamfered structures at the positions where the two ends along the stator core height direction contact the winding. The chamfered structures are oblique or rounded structures used to protect the insulation of the enameled wire during the winding process.

2. The motor stator core structure according to claim 1, characterized in that: Part or all of the core winding slots are provided with an insulating protective layer.

3. The motor stator core structure according to claim 2, characterized in that: The insulating protective layer is obtained by electrophoretic coating, insulating material spraying, insulating material dipping, or insulating coating.

4. The motor stator core structure according to claim 1, characterized in that: The chamfered structure is a chamfered structure obtained by removing sharp edges.

5. The motor stator core structure according to claim 1, characterized in that: The stator core structure end adopts an insulating frame.

6. The motor stator core structure according to claim 1, characterized in that: The stator core structure is an integral structure or a block structure.

7. A motor stator core structure according to claim 6, characterized in that: The stator core of the block structure is assembled into an integral structure by laser welding, or glue pouring, or a combination of laser welding and glue pouring.

8. A winding slot processing method for a motor stator core structure as claimed in any one of claims 1 to 7, characterized in that: The method removes sharp edges of the positions where the two ends of the core winding slot in the core height direction contact the winding, forming a bevel or fillet of a set size to protect the insulation of the enameled wire during the winding process.

9. The winding notch processing method according to claim 8, characterized in that: After removing the sharp edges, the method further performs insulation treatment on part or all of the core winding slots, wherein the insulation treatment adopts electrophoretic coating, insulation material spraying, insulation material dipping or insulation coating to form an insulation protection layer on part or all of the stator core winding slots.

10. The winding notch processing method according to claim 8, characterized in that: The sharp edge removal process adopts laser processing, mechanical processing or corrosion processing.

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