WO2015032160A1

WO2015032160A1 - Method for manufacturing metal core, metal core structure, and motor

Info

Publication number: WO2015032160A1
Application number: PCT/CN2013/090380
Authority: WO
Inventors: 向宇龙
Original assignee: 苏州腾龙电机科技有限公司
Priority date: 2013-09-09
Filing date: 2013-12-24
Publication date: 2015-03-12
Also published as: CN103475170A; CN103475170B

Abstract

Disclosed are a method for manufacturing a metal core, a metal core structure, and a motor. The method is such that: a raw material is stamped and processed to form arced stamping sheets provided with arced connecting parts, first bent parts, and second bent parts; the first bent parts are formed from two lateral extremities of the arced connecting parts while protruding along the radial direction thereof, two extremities corresponding to closed extremities of the first bent parts are bent oppositely to form the second bent parts; the arced connecting parts, the first bent parts, and the second bent parts form a cavity; at least two arced stamping sheets are cladded sequentially, a cavity inner sidewall of the rear arced stamping sheet clads a cavity outer sidewall of the front arced stamping sheet to form an arced fitting block; at least two arced fitting blocks are fitted in the circumferential direction to form a metal core, the arced connecting parts that are adjacent in the circumferential direction are fitted to form an annular magnetic yoke part of the metal core, and, the first bent parts that are adjacent in the circumferential direction are fitted while the second bent parts that are adjacent in the circumferential direction are fitted to form tooth parts of the metal core. The present invention reduces waste generated, thus reducing production costs.

Description

Iron core manufacturing method, core structure and motor

Technical field

The present invention relates to the field of electric machines, and in particular to a method for manufacturing an iron core, a core structure of the motor, and a motor.

Background technique

In the prior art, when manufacturing an iron core of a motor, the entire single piece is usually punched out first. The single piece structure has a yoke portion 11 and a plurality of equally spaced tooth portions 12 as shown in FIG. Then, a certain number of single sheets are stacked in the vertical direction to form a core structure, as shown in FIG. 2 .

In the above method, since the entire single piece needs to be punched, a complete plate having a large area is required as a raw material, and a lot of waste is generated, and the production cost is relatively high.

Summary of the invention

The present invention aims to provide a method for manufacturing a core, a core structure of a motor, and a motor to reduce waste generation and reduce production costs.

Embodiments of the present invention provide a method for manufacturing a core, the method comprising:

Forming a raw material into an arc-shaped punch having a curved connecting portion, a first bent portion, and a second bent portion; wherein the first bent portion is formed by both end portions of the curved connecting portion Forming a protrusion in a radial direction of the arcuate connecting portion; the first bent portion has a closed end that is in contact with the arcuate connecting portion; and the second bent portion is formed by the arcuate connecting portion The corresponding ends of the closed ends of the two first bending portions are formed by bending relative to each other; the curved connecting portion, the first bending portion and the second bending portion are formed with a cavity;

And at least two of the arc-shaped punching sheets are sequentially coated to form an arc-shaped splicing block; wherein, the two adjacent arc-shaped slabs are adjacent to the cavity inner wall of the arc-shaped punching piece Covering the outer side wall of the cavity of the arc-shaped punching piece, the width and height of the arc-shaped punching piece of the latter one are greater than the width and the height of the preceding arc-shaped punching piece, respectively. height;

And splicing at least two of the arc-shaped splicing blocks to form a core, wherein the arc-shaped connecting portions of the outermost arc-shaped slabs of the adjacent arc-shaped splicing blocks are in contact, and the outermost arc of the adjacent arc-shaped splicing blocks The first bent portion of the shaped punching piece is in contact with each other, the second bent portion of the outermost curved punching piece of the adjacent curved splicing block is in contact, and the arc-shaped connecting portion adjacent to the circumferential direction is spliced The annular yoke portion forming the iron core, the first bent portion adjacent in the circumferential direction and the second bent portion adjacent in the circumferential direction are spliced to form a tooth portion of the iron core.

Preferably, the arc-shaped punch having the curved connecting portion, the first bent portion and the second bent portion formed by press working comprises:

And bending the two corresponding ends of the square plate body along the radial direction of the annular yoke portion to form the first bending portion; the first bending portion has a closed end contacting the square plate body;

And bending the corresponding end portions of the closed ends of the two first bending portions to form the second bending portion;

The square steel body is bent to form an arcuate joint.

The square plate body between the first bent portions is bent to form an arcuate connecting portion.

The corresponding end portion of the closed end of the first bent portion is relatively bent to form the second bent portion.

Forming a middle portion of the square plate body to form an arcuate connecting portion;

And bending the two side ends of the square plate body and the arcuate connecting portion to form the first bending portion along a radial direction of the annular yoke portion; the first bending portion has a a closed end of the curved connecting portion;

The ends corresponding to the closed ends of the two first bent portions are relatively bent to form the second bent portion.

Preferably, before the at least two of the arc-shaped splicing blocks are spliced in the circumferential direction to form an iron core, the method further includes:

Forming a groove having a certain depth and extending along a length direction of the arcuate connecting portion at one end of the both end portions of the arcuate connecting portion that is in contact with the arc-shaped connecting portion adjacent in the circumferential direction, and the other The side end portion protrudes to form a plug portion;

The splicing at least two of the curved splicing blocks in the circumferential direction to form a core includes:

The insertion portion of the curved connecting portion is inserted into a groove of the circumferentially adjacent arcuate connecting portion.

The present invention also provides a core structure of an electric motor having an annular yoke portion and a tooth portion formed by the yoke portion protruding in a radial direction, the core structure being formed by the above method;

The core structure is formed by splicing at least two of the arc-shaped splicing blocks in a circumferential direction, and the arc-shaped splicing block is sequentially formed by at least two of the arc-shaped punching pieces, and the arc-shaped punching is formed. The sheet has a curved connecting portion, a first bent portion and a second bent portion;

Wherein the first bending portion is formed by the two end portions of the arc-shaped connecting portion protruding outward in a radial direction of the arc-shaped connecting portion, the first bent portion having the curved shape a closed end at which the connecting portion meets, wherein the second bent portion is formed by bending a corresponding end portion of the closed ends of the two first bent portions of the curved connecting portion; the curved connecting portion The first bent portion and the second bent portion are formed with a cavity;

Adjacent two arc-shaped punching pieces, the inner side wall of the cavity of the latter arc-shaped punching piece is wrapped on the outer side wall of the cavity of the preceding arc-shaped punching piece, The width and height of the arc-shaped punching piece described in the latter are respectively greater than the width and height of the preceding arc-shaped punching piece;

The arcuate connecting portions of the outermost arc-shaped punching pieces of the adjacent arc-shaped splicing blocks are in contact with each other, and the first bent portions of the outermost arc-shaped punching pieces of the adjacent arc-shaped splicing blocks are in contact with each other a second bent portion of the outermost curved punch of the adjacent arc-shaped splicing block is in contact;

The arcuate connecting portions adjacent in the circumferential direction are spliced to form an annular yoke portion of the iron core, the first bent portion adjacent in the circumferential direction, and the second adjacent portion in the circumferential direction The bent portion is spliced to form a tooth portion of the iron core.

Preferably, the one end portion of the both end portions of the arcuate connecting portion that is in contact with the arc-shaped connecting portion adjacent in the circumferential direction is formed with a groove having a certain depth and extending along the longitudinal direction of the arcuate connecting portion. The other side end portion protrudes to form a plug portion; the adjacent arc-shaped splicing block is inserted through the insertion portion of the arc-shaped connecting portion into the groove of the circumferentially adjacent arc-shaped connecting portion.

The present invention also provides an electric machine including a stator and a rotor having the above-described core structure.

The beneficial effects of the invention:

The invention forms an arc-shaped punching piece by bending the raw material, and then sequentially coating the curved punching piece to form an arc-shaped splicing block, and the arc-shaped splicing block is spliced in the circumferential direction to form a core structure, which is mainly bent in the invention. The way to process the raw materials, the thickness required by the core can be achieved by the length of the curved joint of a single curved punch, which reduces the generation of a large amount of waste compared to the prior art, which greatly reduces the cost.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the embodiments will be briefly described below. Obviously, the drawings in the following description are only some of the present invention. For the embodiments, those skilled in the art can obtain other drawings according to the drawings without any creative work.

1 is a schematic view showing the structure of a single piece of iron core in the prior art;

2 is a schematic view showing the structure of a core in the prior art;

Figure 3 is a flow chart of the method in the present invention;

Figure 4 is a schematic view showing the structure of an arc-shaped punching sheet in the present invention;

Figure 5 is a schematic view showing the structure of a curved splicing block in the present invention;

Figure 6 is a schematic view showing the structure of an iron core in one embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention are within the scope of the present invention.

An embodiment of the present invention provides a method for manufacturing a core. As shown in FIG. 3, the method specifically includes the following steps:

S11. Pressing a raw material such as a copper sheet or a silicon steel sheet to form an arc-shaped punch having a curved connecting portion, a first bent portion, and a second bent portion.

4 shows a specific structure of the arc-shaped punching piece, which has a curved connecting portion 31, and a symmetrical first bent portion 32 which is formed by projecting two ends of the curved connecting portion 31 outwardly in the radial direction thereof. And a symmetrical second bent portion 33 formed by relatively bending the end portion corresponding to the closed end of the first bent portion 32 on both sides. The curved connecting portion 31, the first bent portion 31, and the second bent portion 32 constitute an inner cavity 34. It has an inner side wall 341 and an outer side wall 342.

The first bent portion 32 may also be formed by projecting opposite ends of the curved connecting portion 31 inward in the radial direction thereof.

S12. The at least two arc-shaped punching sheets are sequentially coated to form an arc-shaped splicing block. The curved splicing block is shown in Figure 5. Wherein, adjacent two arc-shaped punching pieces, the inner side wall of the cavity of the latter arc-shaped punching piece is wrapped on the outer side wall of the cavity of the preceding arc-shaped punching piece, obviously, the width of the latter arc-shaped punching piece And the height should be greater than the width and height of the previous curved punch, respectively.

S13. Splicing at least two arc-shaped splicing blocks to form a core. As shown in FIG. 6, wherein the arc-shaped connecting portions 42 of the outermost curved punching pieces of the adjacent curved splicing blocks 41 are in contact, and the first bending of the outermost curved punching pieces of the adjacent curved splicing blocks 41 The portions 43 are in contact with each other, and the second bent portions 44 of the outermost curved punching pieces of the adjacent curved splicing blocks 41 are in contact with each other, and the circumferentially adjacent curved connecting portions 42 are spliced to form the annular yoke portion 45 of the iron core. The first bent portion 43 adjacent in the circumferential direction and the second bent portion 44 adjacent in the circumferential direction are spliced to form the tooth portion 46 of the iron core.

In the above steps, step S11 specifically includes three ways:

The first way:

The two corresponding ends of the square plate body are bent in a radial direction of the annular yoke portion to form the first bent portion; the first bent portion has a closed end in contact with the square plate body.

Then, the corresponding ends of the closed ends of the two first bending portions are relatively bent to form the second bending portion;

Finally, the square steel body is bent to form an arcuate joint.

The second way:

The two corresponding ends of the square plate body are bent in a radial direction of the annular yoke portion to form a first bent portion; the first bent portion has a closed end in contact with the square plate body;

The square sheet body between the first bends is then bent to form an arcuate joint.

Finally, the corresponding end portion of the closed end of the first bent portion is relatively bent to form a second bent portion.

The third way:

The intermediate portion of the square sheet body is bent to form an arcuate joint.

Then, the two side ends of the square plate body and the arcuate connecting portion are bent in a radial direction of the annular yoke portion to form the first bent portion; the first bent portion has a closed end in contact with the curved connecting portion;

Finally, the corresponding end portions of the closed ends of the two first bending portions are relatively bent to form the second bending portion.

In order to achieve the splicing between the curved splicing blocks, in the present invention, before the splicing, a certain depth may be formed at one end of the two end portions of the curved connecting portion and the arc-shaped connecting portion adjacent to the circumferential direction. And a groove extending along the longitudinal direction of the arcuate connecting portion, and the other end portion protrudes to form a plug portion. The insertion portions of the curved connecting portions are then inserted into the grooves of the arc-shaped connecting portions adjacent in the circumferential direction.

Of course, in the present invention, the bonding between adjacent splicing speeds can also be achieved by means of soldering or the like, which is not specifically limited in the present invention.

Corresponding to the above method, the present invention also provides a core structure of a motor, which is shown in FIG. a yoke portion 45 having an annular shape and a tooth portion 46 formed to protrude outward in the radial direction by the yoke portion 45, and the core structure is formed by the above method;

The core structure is formed by splicing the at least two arc-shaped splicing blocks 41 in the circumferential direction, and the arc-shaped splicing block 41 is sequentially formed by at least two arc-shaped punching sheets.

Wherein the arc-shaped punching piece has an arc-shaped connecting portion, a first bent portion and a second bent portion, and the first bent portion protrudes outward in a radial direction of the curved connecting portion by both end portions of the curved connecting portion Forming, the first bent portion has a closed end that is in contact with the curved connecting portion, and the second bent portion is formed by bending corresponding ends of the closed ends of the two first bent portions of the curved connecting portion; The shaped connecting portion, the first bent portion, and the second bent portion are formed with a cavity.

In an arc-shaped splicing block 41, an adjacent arc-shaped punching piece, the inner side wall of the cavity of the latter arc-shaped punching piece is wrapped on the outer side wall of the cavity of the preceding arc-shaped punching piece The width and height of the arc-shaped punching piece of the latter described are respectively greater than the width and height of the preceding arc-shaped punching piece.

In Fig. 6, the arcuate connecting portions 42 of the outermost arc-shaped punching pieces of the adjacent arc-shaped splicing blocks 41 are in contact with each other, and the first bent portion 43 of the outermost curved punching piece of the adjacent curved-shaped splicing block 41 is In contact, the second bent portion 44 of the outermost curved punch of the adjacent curved splicing block 41 is in contact.

The arcuate connecting portions 42 adjacent in the circumferential direction are spliced to form an annular yoke portion of the iron core, and the first bent portions 43 adjacent in the circumferential direction are spliced and the second bent portions 44 adjacent in the circumferential direction are spliced together to form The teeth 46 of the core.

In order to facilitate the splicing, one end of the both end portions of the arcuate connecting portion that is in contact with the arc-shaped connecting portion adjacent in the circumferential direction may be formed with a groove having a certain depth and extending along the longitudinal direction of the arcuate connecting portion. The other side end portion protrudes to form a plug portion; the adjacent arc-shaped splicing block is inserted into the groove of the arc-shaped connecting portion adjacent to the circumferential direction through the insertion portion of the arc-shaped connecting portion.

Corresponding to the above method and core structure, the present invention also provides an electric machine including a stator and a rotor. The stator and/or the rotor thereof have the core structure in the above embodiment. For related content, refer to the above embodiments, which will not be described in detail herein.

The specific embodiments described above further explain the objects, technical solutions and beneficial effects of the present invention. It should be noted that the above description is only one specific embodiment of the present invention, and those skilled in the art may Various changes and modifications of the invention are possible without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

A method of manufacturing an iron core, the method comprising:

And at least two of the arc-shaped punching sheets are sequentially coated to form an arc-shaped splicing block; wherein, the two arc-shaped splicing pieces of the arc-shaped splicing block are adjacent to the arc-shaped punching piece of the latter The inner side wall of the cavity is coated on the outer side wall of the cavity of the preceding arc-shaped punching piece, and the width and height of the arc-shaped punching piece of the latter one are respectively larger than the curve of the previous one The width and height of the punch;

2. The method of claim 1 wherein said stamping forming an arc shaped punch having a curved connecting portion, a first bent portion, and a second bent portion comprises:

The square steel body is bent to form an arcuate joint.

3. The method of claim 1 wherein said stamping forming an arc shaped punch having a curved connecting portion, a first bent portion, and a second bent portion comprises:

Forming a square plate body between the first bent portions to form an arc-shaped connecting portion;

4. The method of claim 1 wherein said stamping forming an arc shaped punch having a curved connecting portion, a first bent portion, and a second bent portion comprises:

5. The method according to any one of claims 1 to 4, wherein before the splicing of at least two of the arcuate splicing blocks in the circumferential direction to form an iron core, the method further comprises:

6. A core structure of an electric motor having an annular yoke portion and a tooth portion formed by the yoke portion protruding in a radial direction, wherein the core structure is determined by the claims 1-5 Forming according to any of the methods described;

7. The core structure according to claim 6, wherein one side end portion of both end portions of the arcuate connecting portion that is in contact with the circumferentially adjacent arcuate connecting portion is formed to have a certain depth and a groove extending in a longitudinal direction of the arcuate connecting portion, the other end portion protruding to form a plug portion; and the adjacent arc-shaped splicing block is inserted into a circumferentially adjacent arc through the insertion portion of the arc-shaped connecting portion The grooves of the shaped joint are spliced.

8. An electric machine comprising a stator and a rotor, characterized in that the stator and/or rotor have a core structure as claimed in claim 6 or 7.