CN218301043U - Low in manufacturing cost, strong rotor core and motor rotor of leak protection magnetism - Google Patents

Abstract

The utility model relates to the technical field of electric motor, concretely relates to rotor core and electric motor rotor that low in manufacturing cost, leak protection magnetism are strong, rotor core, including independent three angular teeth that a plurality of circumference arrays were arranged with be located the fixed punching sheet of independent three angular teeth upside and/or downside, separate each other between the independent three angular teeth, fixed punching sheet can supply independent three angular teeth location installation. Any two independent triangular teeth are not directly connected, particularly, an inner magnetic bridge connected with the tooth tops of the triangular teeth and an outer magnetic bridge connected with the tooth tails of the triangular teeth in the prior art do not exist, the phenomenon of magnetic leakage to the rotor core caused by the inner magnetic bridge and the outer magnetic bridge is thoroughly eliminated, the performance of the rotor core is improved, the magnetic field in the rotor core is enabled to have magnetic interaction with an external rotor as much as possible in actual operation, and therefore the torque is improved; the independent triangular teeth are directly processed by using raw materials, so that the manufacturing cost is reduced.

Description

Low in manufacturing cost, strong rotor core and motor rotor of leak protection magnetism

Technical Field

The utility model relates to the technical field of electric machines, concretely relates to low in manufacturing cost, strong rotor core of leak protection magnetism and electric motor rotor.

Background

The permanent magnet brushless direct current motor is more and more widely applied due to the advantages of high efficiency, energy conservation and the like. The air conditioner replaces the traditional alternating current induction motor to be used in the field of air conditioners, and is the necessity of the development of the energy-saving trend in recent years. The permanent magnet brushless direct current motor mainly comprises a stator assembly, a rotor assembly, an end cover and other parts, wherein the rotor assembly is arranged in the stator assembly, and the motor is assembled after the rotor assembly is connected with the end cover in a compression mode. The stator assembly is formed by welding straight iron core winding into a circle and then performing injection molding on the circle and BMC plastic package material through an injection mold. The rotor assembly is mainly formed by injection molding of a rotor iron core, a rotor shaft, a plurality of permanent magnets and PBT injection molding materials, and the rotor iron core is formed by laminating a plurality of rotor punching sheets through a high-punching mold.

A rotor core as disclosed in patent application No. CN202111207625.1, comprising a plurality of laminations, each lamination having a base formed with a central shaft aperture, and a plurality of triangular teeth arranged circumferentially around the base, wherein each triangular tooth includes an outer edge distal from the base and a tip proximal to the base; the plurality of punching sheets are arranged together in a stacking manner, so that the central shaft holes of the punching sheets are axially aligned; the punching sheets comprise at least two end punching sheets positioned at the end part of the rotor core and a plurality of middle punching sheets positioned between the end punching sheets. According to the rotor core structure, the number of the outer magnetic bridges and the number of the inner magnetic bridges are reduced as much as possible, so that magnetic leakage is reduced as much as possible on the basis of ensuring the structural strength of the rotor core, and the performance of the rotor core is improved; however, the end punching sheet in the patent has a plurality of outer magnetic bridges and inner magnetic bridge structures for ensuring the strength, the whole end punching sheet is a complete whole body, the magnetic leakage prevention effect is poor, the whole end punching sheet is used as a whole body for punching and manufacturing during production and manufacturing, hollow parts on the end punching sheet are required to be cut off on raw materials, a lot of waste materials are generated, and the raw material cost is high; the structural strength of the middle stamped sheet in the patent is supported by the end stamped sheet, so that an external magnetic bridge of the middle stamped sheet is eliminated and is divided into a diagonal tooth stamped sheet and an independent triangular tooth, the diagonal tooth stamped sheet is internally provided with an internal magnetic bridge, the independent triangular tooth is not provided with the internal magnetic bridge between the base, although the magnetic leakage prevention performance can be improved, the internal magnetic bridge is not completely eliminated, the diagonal tooth stamped sheet and the independent triangular tooth form the middle stamped sheet, the middle stamped sheet is still formed by stacking the middle stamped sheets layer by layer when a rotor core is manufactured, the diagonal tooth stamped sheets in different layers are staggered in angle when the rotor core is stacked, the independent triangular teeth in different layers are stacked in the diagonal tooth stamped sheet of one layer, and the structural strength of the middle stamped sheet is ensured by the integral diagonal tooth stamped sheet; the diagonal tooth punching sheet is provided with an inner magnetic bridge, so that the design of the middle punching sheet does not achieve the optimization of the leakage-proof magnetic performance of the rotor core, the existence of the inner magnetic bridge still can cause magnetic leakage, and the hollowed-out parts of the diagonal tooth punching sheet as a whole are required to be cut off on raw materials during processing and manufacturing, so that a large amount of waste materials are caused, and the cost of the raw materials is higher.

SUMMERY OF THE UTILITY MODEL

The utility model discloses make the improvement to the problem that above-mentioned prior art exists, promptly the utility model aims to solve the technical problem that a low in manufacturing cost, the strong rotor core of leak protection magnetism is provided, include independent three angular teeth that a plurality of circumference arrays were arranged and be located the fixed punching of independent three angular teeth upside and/or downside, separate each other between the independent three angular teeth, fixed punching can supply independent three angular teeth location installation.

As the utility model discloses a preferred, fixed towards the piece including solid fixed ring with connect the fixed teeth piece of solid fixed ring outer fringe, fixed teeth piece winds solid fixed ring is the circumference array and arranges, arbitrary one independent triangle tooth at least with one fixed teeth piece corresponds the location installation.

As the utility model discloses a preferred, the upper and lower both sides of independent triangle tooth all are provided with fixed towards piece, arbitrary one independent triangle tooth all with upper and lower two fixed tooth piece corresponds the location installation.

As the utility model discloses a preferred, the upper and lower side surface of independent triangle tooth all has the inserting groove, fixed tooth piece have with the superimposed surface that the upside or the downside surface of independent triangle tooth paste mutually, be connected with on the superimposed surface and stretch into carry out grafting complex grafting post in the inserting groove.

As a preferred choice, gu fixed ring orientation be connected with a central positioning section of thick bamboo, all on the face of independent triangle tooth encloses into central shaft hole through the prong, the extending direction of a central positioning section of thick bamboo with the axial in central shaft hole is unanimous and stretches into in the central shaft hole.

As a preferred aspect of the present invention, the tooth tip portion of the independent triangular tooth has a space with the outer wall of the center positioning cylinder.

As the utility model discloses a preferred, the spliced pole is faced dorsad gu fixed ring's face is for leaning on the outer wall, keep away from in the inserting groove the lateral wall of tooth point portion is for leaning on the inner wall, stretches into in the inserting groove the spliced pole passes through lean on the outer wall with lean on the inner wall counterbalance and lean on.

As the optimization of the utility model, a space is arranged between any two independent triangular teeth adjacent in the arrangement circumference direction and a permanent magnet mounting groove is formed, one side of each independent triangular tooth far away from the central shaft hole is protruded with a tooth tail part in two circumferential directions, and the distance between the two adjacent tooth tail parts is smaller than the width of the permanent magnet mounting groove; the outer edge of the fixing ring is provided with a permanent magnet limiting part extending towards the permanent magnet mounting groove, and the permanent magnet limiting part is positioned between the two adjacent fixing tooth sheets.

As the utility model discloses a preferred, independent triangle tooth piles up fixed formation from top to bottom by the three triangle tooth punching sheets of multi-disc, the jack has on the three triangle tooth punching sheets, constitute after piling up from top to bottom the jack the inserting groove.

An electric machine rotor includes the rotor core.

Has the beneficial effects that:

any two independent triangular teeth are not directly connected, particularly an inner magnetic bridge connected with a triangular tooth tip and an outer magnetic bridge connected with a triangular tooth tail in the prior art do not exist, the magnetic leakage phenomenon of the rotor core caused by the inner magnetic bridge and the outer magnetic bridge is thoroughly eliminated, the performance of the rotor core is improved, the magnetic field in the rotor core is enabled to have magnetic interaction with an external rotor as much as possible in actual operation, and therefore the torque is improved; the independent triangular teeth are directly processed by using the raw materials during processing and manufacturing, a large amount of hollow parts do not exist, a large amount of waste materials do not need to be cut on the raw materials, the raw material cost is effectively saved, and the manufacturing cost is reduced.

Drawings

Fig. 1 is a schematic diagram of the rotor core after the independent triangular teeth and the fixed punching sheet are separated;

FIG. 2 is a top view of individual triangular teeth arranged in a circumferential array;

FIG. 3 is a schematic view of the structure of an independent triangular tooth;

fig. 4 is a schematic structural diagram of the fixed stamped steel;

fig. 5 is a schematic perspective view of the fixed stamped steel;

FIG. 6 is a top view of a rotor core;

in the figure: 1. independent triangle tooth, 11, inserting groove, 111, support and lean on the inner wall, 12, prong portion, 13, tooth afterbody, 2, fixed punching, 21, solid fixed ring, 22, fixed tooth piece, 221, coincide face, 222, the grafting post, 223, support and lean on the outer wall, 23, a central location section of thick bamboo, 24, the spacing portion of permanent magnet, 3, central shaft hole, 4, the permanent magnet mounting groove.

Detailed Description

The following specific embodiments are merely illustrative of the present invention, and are not intended to limit the present invention, and those skilled in the art can make modifications of the present embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent laws and protection within the scope of the present invention.

The utility model relates to a low in manufacturing cost, rotor core that leak protection magnetism is strong, independent triangle tooth 1 of arranging including a plurality of circumference arrays with be located the fixed punching sheet 2 of independent triangle tooth 1 upside and/or downside, separate each other between the independent triangle tooth 1, fixed punching sheet 2 can supply independent triangle tooth 1 location installation. Every in this embodiment independent triangle tooth 1 all is independent, after all independent triangle teeth 1 enclose into the round, do not have a center ring all to be connected with each independent triangle tooth 1 in central point to put yet, so do not have direct connection between arbitrary two independent triangle teeth 1, especially do not have the interior magnetic bridge of connecting the triangle tooth prong among the prior art and the outer magnetic bridge of connecting the triangle tooth tail, the magnetic leakage phenomenon that causes rotor core because of interior magnetic bridge and outer magnetic bridge has thoroughly been eliminated, improve rotor core's performance, make the magnetic field in the rotor core as much as possible take place magnetism interact with outside rotor in the actual operation, thereby improve the torque. In addition, the independent triangular teeth 1 are independent from each other, the independent triangular teeth 1 are manufactured in batches when being produced and manufactured, then the independent triangular teeth 1 are arranged in a circle in a surrounding mode through arrangement and combination, and then the independent triangular teeth 1 are positioned and installed from the upper side and/or the lower side by using the fixed punching sheet 2, so that the independent triangular teeth 1 are enabled to keep the circumferential array arrangement and the mutually-separated position relation, and preparation is made for a subsequent process of plastic coating outside the rotor core. In the embodiment, the upper and lower directions, namely the thickness direction of the independent triangular teeth 1, are stacked layer by layer to form thicker triangular teeth in the prior art through punching sheets comprising triangular teeth sheets, the punching sheets are integrally processed by raw materials during processing and manufacturing, the shapes of the punching sheets are determined, and a plurality of hollow parts are contained, so that a lot of waste materials are generated. The manufacturing process of this embodiment is completely different from the prior art, firstly processes out independent triangular teeth 1 singly, then maintains independent triangular teeth 1 in the position relation of enclosing into a circle through the location restriction of the fixed punching sheet 2 to form a rotor core, so directly use raw materials to process independent triangular teeth 1 when manufacturing, do not have a large amount of fretworks, do not need to cut off a large amount of waste materials on the raw materials, effectively save raw materials cost, reduce manufacturing cost. Specifically, in the present embodiment, it is preferable that the independent triangular teeth 1 are formed by vertically stacking and fixing a plurality of triangular tooth punching sheets, and a stamping and point-fastening process is adopted, so that during production and manufacturing, firstly, the triangular tooth punching sheets are produced in batches, then, the plurality of triangular tooth punching sheets are stacked and fixed by the stamping and point-fastening process to form the complete independent triangular teeth 1, and when raw materials are used for production, the outlines of the triangular tooth punching sheets can be closely arranged on the raw materials along a straight line, thereby effectively reducing the generation of waste materials; furtherly can adopt two adjacent triangle tooth towards crisscross the arranging in opposite directions of arranging when the profile of following the linear arrangement triangle tooth towards the piece, improve the compactness of arranging, further reduce the production of waste material, reduce manufacturing cost.

In this embodiment the fixed punching sheet 2 comprises a fixed ring 21 and fixed teeth 22 connected to the outer edge of the fixed ring 21, the fixed teeth 22 are arranged in a circumferential array around the fixed ring 21, and any one of the independent triangular teeth 1 is at least corresponding to one of the fixed teeth 22 for positioning and installation. The fixed punching sheet 2 is a structure formed by integrally forming the fixed ring 21 and the fixed tooth sheets 22, so that the integrity is high, the structural strength is high, the positions of the fixed tooth sheets 22 are determined relative to the fixed ring 21 and are arranged in a circumferential array, the fixed tooth sheets 22 and the independent triangular teeth 1 can be mutually fixed, as long as the independent triangular teeth 1 are positioned and installed on the fixed tooth sheets 22, the positions of the independent triangular teeth 1 are limited and determined, and therefore all the independent triangular teeth 1 are kept in the position relationship of mutual separation and circumferential array arrangement, and preparation is made for the subsequent process of plastic-coated forming of the outer part of the rotor core. Independent triangle tooth 1 is rotor core's main part, and its thickness is great, and fixed punching sheet 2 only plays the location restriction effect to independent triangle tooth 1, so thickness is less. For improving the restriction effect of fixed punching sheet 2 to independent triangle tooth 1, this embodiment is preferred the upper and lower both sides of independent triangle tooth 1 all are provided with fixed punching sheet 2, arbitrary one independent triangle tooth 1 all with upper and lower two fixed teeth piece 22 corresponds the location installation, and every independent triangle tooth 1 is all fixed by two fixed punching sheet 2 centre grippings from top to bottom like this, and holistic structural stability obtains effectively improving under the prerequisite of guaranteeing independent triangle tooth 1 to separate each other.

The fixed connection relation of the independent triangular teeth 1 and the fixed teeth 22 in the fixed stamped sheets 2 is preferably in inserting fit, the upper side surface and the lower side surface of each independent triangular tooth 1 are provided with inserting grooves 11, each fixed tooth 22 is provided with a superposed surface 221 attached to the upper side surface or the lower side surface of each independent triangular tooth 1, each superposed surface 221 is connected with an inserting column 222 capable of extending into each inserting groove 11 for inserting fit, when the fixed stamped sheets 2 are positioned and installed, the fixed stamped sheets 2 are inserted into the inserting grooves 11 of each independent triangular tooth 1 through the inserting columns 222 for inserting fit, then the superposed surfaces 221 of the fixed teeth 22 are attached to the upper side surfaces or the lower side surfaces of the independent triangular teeth 1, so that the fixed stamped sheets 2 and the independent triangular teeth 1 are assembled to form a whole with stable structure and high integrity, and preparation is made for subsequent plastic coating forming of the outer portion of the rotor core. All in this embodiment independent triangle tooth 1 encloses into central shaft hole 3 through tooth point portion 12, for further improvement rotor core's overall structure stability, prefers fixed ring 21 orientation be connected with a central positioning section of thick bamboo 23 on independent triangle tooth 1's the face, a central positioning section of thick bamboo 23 the extending direction with central shaft hole 3's axial is unanimous and stretches into in the central shaft hole 3, when producing relative displacement between fixed punching sheet 2 and the independent triangle tooth 1, excessive skew in position can be avoided to a central positioning section of thick bamboo 23 to make fixed punching sheet 2 can not break away from independent triangle tooth 1 easily, the stability of being connected between fixed punching sheet 2 and the independent triangle tooth 1 further improves.

The fixed punching sheet 2 mainly plays roles in positioning and limiting, so that the material of the fixed punching sheet can be selected from silicon steel sheets the same as that of the independent triangular teeth 1, other materials can be adopted, and the same silicon steel sheet material is preferably adopted in consideration of integrity. Under the condition that the fixed punching sheet 2 and the independent triangular teeth 1 are made of silicon steel sheets, the tooth tip parts 12 of the independent triangular teeth 1 abut against the outer side wall of the central positioning cylinder 23 in one implementation mode, so that the structural stability of the whole rotor iron core is improved, but the abutting of the independent triangular teeth 1 and the central positioning cylinder 23 can cause the inner magnetic bridge to be formed newly, magnetic leakage is caused, and the performance of the rotor iron core is reduced; therefore, the present embodiment adopts another embodiment, that is, it is preferable that a gap is provided between the tooth tip 12 of the independent triangular tooth 1 and the outer wall of the central positioning cylinder 23, so as to avoid formation of an inner magnetic bridge, and although the structural strength of the whole rotor core is not improved, the gap between the tooth tip 12 of the independent triangular tooth 1 and the central positioning cylinder 23 is small, and the central shaft hole 3 can prevent excessive position deviation of the fixed stamped steel 2 relative to the independent triangular tooth 1 by limiting the central positioning cylinder 23, thereby ensuring the integrity and stability of the rotor core.

In this embodiment, preferably, the surface of the insertion column 222 facing away from the fixing ring 21 is an abutting outer wall 223, the side wall of the insertion groove 11 far away from the tooth tip 12 is an abutting inner wall 111, and the insertion column 222 extending into the insertion groove 11 abuts against the abutting inner wall 111 through the abutting outer wall 223, so that the abutting can limit the displacement of the independent triangular tooth 1 towards the central positioning cylinder 23 relative to the fixing punch 2, and the independent triangular tooth 1 is prevented from contacting the central positioning cylinder 23 to form an inner magnetic bridge. The inner wall 111 and the outer wall 223 are both arc-shaped surfaces in the embodiment, so that the fitting degree is improved, the assembly is facilitated, and the pressure bearing capacity is improved. The rotor core naturally needs to further comprise permanent magnets, in the embodiment, a space is formed between any two independent triangular teeth 1 which are adjacent in the circumferential direction and form a permanent magnet mounting groove 4 for mounting the permanent magnets, the tooth tail portions 13 protrude from one side, far away from the central shaft hole 3, of the independent triangular teeth 1 in two circumferential directions, the distance between every two adjacent tooth tail portions 13 is smaller than the width of the permanent magnet mounting groove 4, and the tooth tail portions 13 can block and limit the permanent magnets in the permanent magnet mounting groove 4 in the radial direction and prevent the permanent magnets from separating from the permanent magnet mounting groove 4 in the radial direction; a permanent magnet limiting part 24 extending towards the permanent magnet mounting groove 4 is arranged on the outer edge of the fixing ring 21, and the permanent magnet limiting part 24 is positioned between two adjacent fixing tooth sheets 22; when the permanent magnet is installed, the permanent magnet needs to be inserted into the permanent magnet installation groove 4 along the up-down direction, the permanent magnet is limited by the tooth tail part 13 in the radial direction, the permanent magnet is limited by the permanent magnet limiting part 24 in the radial direction, namely, one side of the permanent magnet abuts against the tooth tail part 13 and the other side abuts against the permanent magnet limiting part 24, and the permanent magnet is ensured to be stable in the permanent magnet installation groove 4. In this embodiment, one side of the independent triangular tooth 1, which is far away from the central shaft hole 3, is an arc-shaped outer side to form a circular outer contour of the rotor core, so that two tooth tails 13 on the independent triangular tooth 1 extend in an arc shape along the axial direction.

In this embodiment, the independent triangular teeth 1 are formed by vertically stacking and fixing a plurality of triangular tooth punching sheets, and a punching point-buckling process is specifically adopted, so that the triangular tooth punching sheets are provided with insertion holes, and the insertion grooves 11 are formed after the insertion holes are vertically stacked. In this embodiment, the fixed tooth piece 22 is also a triangular structure, the side edge far away from the fixed ring 21 is an arc edge, and the projections of the other two side edges along the up-down direction on the independent triangular teeth 1 coincide with the two side edges on the upper side or the lower side surface of the independent triangular teeth 1, so that the fixed tooth piece 22 does not shield the permanent magnet installation groove 4 in the up-down direction, and the superposition surface 221 of the fixed tooth piece 22 can be attached to the independent triangular teeth 1 as much as possible, thereby improving the structural stability of the whole rotor core.

The utility model relates to an electric motor rotor, include rotor core.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The utility model provides a low in manufacturing cost, rotor core that leak protection magnetism is strong, its characterized in that includes independent triangle tooth (1) that a plurality of circumference arrays were arranged and is located independent triangle tooth (1) upside and/or fixed punching (2) of downside, separate each other between independent triangle tooth (1), fixed punching (2) can supply independent triangle tooth (1) location installation.

2. The rotor core with low manufacturing cost and strong leakage-proof magnetism according to claim 1, wherein the fixed punching sheet (2) comprises a fixed ring (21) and fixed tooth sheets (22) connected with the outer edge of the fixed ring (21), the fixed tooth sheets (22) are arranged in a circumferential array around the fixed ring (21), and any one of the independent triangular teeth (1) is correspondingly positioned and installed with at least one of the fixed tooth sheets (22).

3. The rotor core with low manufacturing cost and strong leakage-proof magnetism according to claim 2, wherein the fixed punching sheets (2) are arranged on the upper side and the lower side of the independent triangular teeth (1), and any one independent triangular tooth (1) is correspondingly positioned and installed with the upper fixed tooth sheet (22) and the lower fixed tooth sheet (22).

4. The rotor core with low manufacturing cost and strong leakage-proof magnetism according to claim 3, wherein the upper and lower side surfaces of the independent triangular teeth (1) are provided with insertion grooves (11), the fixed tooth plates (22) are provided with superposed surfaces (221) attached to the upper or lower side surfaces of the independent triangular teeth (1), and the superposed surfaces (221) are connected with insertion columns (222) capable of extending into the insertion grooves (11) for insertion and matching.

5. The rotor core with low manufacturing cost and strong leakage-proof magnetism according to claim 4, wherein a face of the fixing ring (21) facing the independent triangular teeth (1) is connected with a central positioning cylinder (23), all the independent triangular teeth (1) enclose a central shaft hole (3) through tooth tip portions (12), and the extending direction of the central positioning cylinder (23) is consistent with the axial direction of the central shaft hole (3) and extends into the central shaft hole (3).

6. A rotor core with low manufacturing cost and strong leakage-proof magnetism according to claim 5, characterized in that the tooth tip (12) of the independent triangular tooth (1) has a space with the outer wall of the center positioning cylinder (23).

7. The rotor core with low manufacturing cost and strong leakage-proof magnetism according to claim 6, wherein the surface of the plug-in post (222) facing away from the fixing ring (21) is an abutting outer wall (223), the side wall of the plug-in slot (11) far away from the tooth tip (12) is an abutting inner wall (111), and the plug-in post (222) extending into the plug-in slot (11) abuts against the abutting inner wall (111) through the abutting outer wall (223).

8. The rotor core with low manufacturing cost and strong leakage-proof magnetism according to claim 7, wherein a permanent magnet mounting groove (4) is formed between any two independent triangular teeth (1) which are arranged and adjacent in the circumferential direction, tooth tail portions (13) protrude from one side, far away from the central shaft hole (3), of the independent triangular teeth (1) in the two circumferential directions, and the distance between every two adjacent tooth tail portions (13) is smaller than the width of the permanent magnet mounting groove (4); the outer edge of the fixing ring (21) is provided with a permanent magnet limiting part (24) extending towards the permanent magnet mounting groove (4), and the permanent magnet limiting part (24) is located between two adjacent fixing tooth sheets (22).

9. The rotor core with low manufacturing cost and strong leakage-proof magnetism according to claim 4, wherein the independent triangular teeth (1) are formed by vertically stacking and fixing a plurality of triangular tooth punching sheets, the triangular tooth punching sheets are provided with insertion holes, and the insertion holes are stacked up and down to form the insertion grooves (11).

10. A rotor for an electric machine, comprising the rotor core according to any one of claims 1 to 9, which is manufactured at low cost and has high leakage-proof magnetic properties.

Images