CN118300295A

CN118300295A - Rotor core and motor

Info

Publication number: CN118300295A
Application number: CN202410581841.XA
Authority: CN
Inventors: 郑荣威; 项源; 王洪波; 杨波; 应宣敏; 王恒; 郑云飞
Original assignee: Suzhou Find Stamping Machinery Technology Co ltd
Current assignee: Suzhou Find Stamping Machinery Technology Co ltd
Priority date: 2024-05-11
Filing date: 2024-05-11
Publication date: 2024-07-05

Abstract

The invention discloses a rotor core, which belongs to the field of motors and comprises a plurality of laminations, wherein each lamination is provided with a mounting hole, the mounting hole is circular, the edge of the mounting hole is provided with a plurality of spline teeth, the spline teeth are uniformly arranged at intervals, the laminations are stacked and mutually fixed to form the rotor core along the height direction, the mounting holes of the laminations are coaxially provided with through holes for mounting a rotating shaft, the adjacent two laminations are staggered by a fixed angle, the spline teeth of the adjacent two laminations are staggered and are continuous in the height direction to form a contact surface, the contact surface is spirally arranged in the through holes, the contact surface is abutted against the outer wall of the rotating shaft, a groove between the adjacent two contact surfaces and the outer wall of the rotating shaft form a cooling channel, and by the design, the contact of the outer wall of the rotating shaft and the spline teeth of the rotor core is distributed on the whole periphery on the premise of maintaining the heat dissipation performance between the rotating shaft and the rotor core, so that the friction force between the rotor core and the rotating shaft is improved, and the service life of the motor is prolonged.

Description

Rotor core and motor

Technical Field

The invention relates to the field of motors, in particular to a rotor core and a motor comprising the rotor core.

Background

The rotor of a brushless dc motor generally includes a rotating shaft, a rotor core fixedly mounted to the rotating shaft, and a number of permanent magnets fixed to the rotor core. The rotor core comprises an inner ring part and an outer ring part, wherein the inner ring part is provided with a central through hole for installing the rotating shaft.

When the motor works, a large amount of heat is generated in the motor, a plurality of grooves are often formed in the central through hole so as to facilitate heat dissipation of the rotor, and gaps are formed between the rotating shaft and the rotor core so as to facilitate heat dissipation. And when the rotor core is mounted on the rotating shaft, air in the central through hole can be discharged by the grooves, so that the rotor core and the rotating shaft are convenient to mount.

However, after the groove is arranged on the central through hole, the friction force between the rotor core and the rotating shaft is reduced, so that the service life of the motor is shortened.

Disclosure of Invention

In order to overcome the defects in the prior art, one of the purposes of the invention is to provide a motor which can improve the friction force between a rotor core and a rotating shaft on the premise of keeping the heat dissipation performance between the rotating shaft and the rotor core.

In order to overcome the defects in the prior art, the second object of the invention is to provide a rotor core which can improve the friction force between the rotor core and the rotating shaft on the premise of keeping the heat dissipation performance between the rotating shaft and the rotor core.

One of the purposes of the invention is realized by adopting the following technical scheme:

The utility model provides a rotor core, includes a plurality of lamination, every the lamination is equipped with the mounting hole, the mounting hole is circular, the edge of mounting hole is equipped with a plurality of flower groove teeth, and a plurality of flower groove teeth even interval sets up, and is followed the direction of height a plurality of the lamination stacks and mutually fixed the formation rotor core, a plurality of the coaxial through-hole that forms of mounting hole of lamination, the through-hole is used for installing the pivot, adjacent two the lamination staggers fixed angle, makes adjacent two the flower groove teeth of lamination stagger and in order to form the contact surface in succession in the direction of height, the contact surface is the spiral.

Further, the number of the contact surfaces is multiple, grooves are formed between two adjacent contact surfaces, and the grooves are spiral.

Further, the contact surfaces are uniformly distributed on a cylindrical surface.

Further, each spline tooth is arc-shaped towards the end face of the mounting hole.

Further, the end surfaces of the plurality of flower groove teeth of the same lamination are positioned on the same circle.

Further, in the height direction, the spline teeth on the same contact surface form a stepped structure.

The second purpose of the invention is realized by adopting the following technical scheme:

The utility model provides a motor, includes pivot and rotor core, rotor core includes a plurality of laminations, every the lamination is equipped with the mounting hole, the mounting hole is circular, the edge of mounting hole is equipped with a plurality of flower groove teeth, and a plurality of flower groove teeth evenly spaced set up, along the direction of height a plurality of the lamination piles up and mutually fixes and forms rotor core, a plurality of the coaxial through-hole that forms of mounting hole of lamination, the through-hole is used for installing the pivot, adjacent two the lamination staggers fixed angle, makes adjacent two the flower groove teeth of lamination stagger and in succession in the direction of height in order to form the contact surface, the contact surface is the spiral, the pivot install in the through-hole, the contact surface with the outer wall of pivot is contradicted, adjacent two recess between the contact surface with the pivot outer wall forms the cooling passageway.

Further, the number of the contact surfaces is plural, and the plural contact surfaces encircle the outer wall of the rotating shaft.

Further, the end face of each spline tooth facing the mounting hole is arc-shaped, and the end faces of a plurality of spline teeth of the same lamination are located on the same circle.

Compared with the prior art, the adjacent two laminations of the rotor core are staggered by a fixed angle, so that the spline teeth of the adjacent two laminations are staggered and are continuous in the height direction to form a contact surface, the contact surface is spiral, the rotating shaft is arranged in the through hole, the contact surface is abutted against the outer wall of the rotating shaft, a cooling channel is formed between the groove between the adjacent two contact surfaces and the outer wall of the rotating shaft, and by the design, on the premise of keeping the heat dissipation performance between the rotating shaft and the rotor core, the contact between the outer wall of the rotating shaft and the spline teeth of the rotor core is distributed on the whole periphery by the spiral contact surfaces, so that the friction force between the rotor core and the rotating shaft is improved, and the service life of a motor is prolonged.

Drawings

FIG. 1 is a perspective view of an electric motor according to the present invention;

fig. 2 is a perspective view of a rotor core of the motor of fig. 1;

fig. 3 is a perspective view of an inner wall of a through hole of the rotor core of fig. 2;

FIG. 4 is a top view of a lamination of the rotor core of FIG. 2;

FIG. 5 is an enlarged view of the laminate of FIG. 4 at A;

Fig. 6 is a perspective cross-sectional view of the motor of fig. 1.

In the figure: 10. a rotor core; 11. lamination; 110. a mounting hole; 111. flower groove teeth; 12. a through hole; 13. a contact surface; 14. a groove; 20. a rotating shaft.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or be present as another intermediate element through which the element is fixed. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Fig. 1 shows a motor according to the present invention, which includes a rotor core 10 and a rotating shaft 20. The rotor core 10 is fixedly mounted on the rotating shaft 20, and the rotating shaft 20 drives the rotor core 10 to rotate.

With continued reference to fig. 2 to 5, the rotor core 10 includes a plurality of laminations 11, and the plurality of laminations 11 are stacked in the height direction and fixed to each other. Specifically, the lamination sheets 11 are fixed by glue or a buckle.

The laminations 11 are circular in shape, each lamination 11 being provided with a mounting hole 110, the mounting holes 110 being located at the centroid of the lamination 11. The mounting hole 110 is circular, and the edge of the mounting hole 110 is provided with spline teeth 111. The number of the spline teeth 111 is plural, the spline teeth 111 are uniformly distributed at intervals at the edge of the mounting hole 110, and a recess is formed between two adjacent spline teeth 111. The end face of each spline tooth 111 facing the mounting hole 110 is circular arc-shaped, and the end faces of the spline teeth 111 are located on a circumference.

When the plurality of laminations 11 are stacked in the height direction and fixed to each other, the plurality of mounting holes 110 coaxially form the through holes 12, and the through holes 12 are used to fix the rotating shaft 20. The adjacent two lamination sheets 11 are staggered by a fixed angle, so that the spline teeth 111 on the inner wall of the through hole 12 are staggered, but the spline teeth 111 at the corresponding positions of the adjacent two lamination sheets 11 are continuous, the spline teeth 111 of the lamination sheets 11 form a contact surface 13, and the contact surface 13 is spiral. Specifically, the number of the contact surfaces 13 is plural, the contact surfaces 13 are uniformly distributed on the cylindrical surface at intervals, a groove 14 is formed between two adjacent contact surfaces 13, and the groove 14 is used for dissipating heat and exhausting air in the through hole 12 when the rotating shaft 20 is installed, so that the installation is convenient. The grooves 14 are helical. The spline teeth 111 on the same contact surface 13 form a stepped structure in the height direction.

With continued reference to fig. 1 and 6, when the motor is assembled, the rotor core 10 is fixedly mounted on the rotating shaft 20. Specifically, the rotating shaft 20 extends into the through hole 12 of the rotor core 10, at this time, the spiral contact surface 13 formed by the spline teeth 111 is abutted against the outer wall of the rotating shaft 20, and the groove 14 and the outer wall of the rotating shaft 20 form a cooling channel, which is spiral. Since the contact surface 13 is spiral, the contact surfaces of the rotor core 10 and the outer wall of the rotor core 20 are axially staggered and distributed on the whole periphery, thereby increasing the friction force between the rotor core 10 and the rotor core 20. Because of the existence of the cooling channel, heat generated when the rotating shaft 20 drives the rotor core 10 to rotate can be dissipated from the cooling channel, and the cooling channel is spiral, so that compared with the linear cooling channel in the prior art, the cooling efficiency is higher.

The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, it is possible to make several modifications and improvements without departing from the concept of the present invention, which are equivalent to the above embodiments according to the essential technology of the present invention, and these are all included in the protection scope of the present invention.

Claims

1. A rotor core comprising a plurality of laminations, characterized in that: each lamination is equipped with the mounting hole, the mounting hole is circular, the edge of mounting hole is equipped with a plurality of flower groove teeth, and a plurality of flower groove teeth evenly spaced sets up, along the direction of height a plurality of the lamination piles up and mutually fixes and form rotor core, a plurality of the coaxial through-hole that forms of mounting hole of lamination, the through-hole is used for installing the pivot, adjacent two the lamination staggers fixed angle, makes adjacent two the flower groove teeth of lamination stagger and in succession in the direction of height in order to form the contact surface, the contact surface is the spiral.

2. The rotor core of claim 1, wherein: the number of the contact surfaces is multiple, grooves are formed between two adjacent contact surfaces, and the grooves are spiral.

3. The rotor core as recited in claim 2, wherein: the contact surfaces are uniformly distributed on a cylindrical surface.

4. The rotor core of claim 1, wherein: and each spline tooth is arc-shaped towards the end face of the mounting hole.

5. The rotor core as recited in claim 4, wherein: the end surfaces of a plurality of flower groove teeth of the same lamination are positioned on the same circle.

6. The rotor core of claim 1, wherein: in the height direction, the spline teeth on the same contact surface form a stepped structure.

7. An electric machine, includes pivot and rotor core, rotor core includes a plurality of laminations, its characterized in that: each lamination is equipped with the mounting hole, the mounting hole is circular, the edge of mounting hole is equipped with a plurality of flower groove teeth, and a plurality of flower groove teeth evenly spaced sets up, along the direction of height a plurality of lamination piles up and mutually fixes and form rotor core, a plurality of the coaxial through-hole that forms of mounting hole of lamination, the through-hole is used for installing the pivot, adjacent two the lamination staggers fixed angle, makes adjacent two the flower groove teeth of lamination stagger and in succession in the direction of height in order to form the contact surface, the contact surface is the spiral, the pivot install in the through-hole, the contact surface with the outer wall of pivot is contradicted, adjacent two recess between the contact surface with the pivot outer wall forms the cooling channel.

8. The electric machine of claim 7, wherein: the number of the contact surfaces is multiple, and the contact surfaces encircle the outer wall of the rotating shaft.

9. The electric machine of claim 7, wherein: in the height direction, the spline teeth on the same contact surface form a stepped structure.

10. The electric machine of claim 7, wherein: the end face of each spline tooth, which faces the mounting hole, is arc-shaped, and the end faces of a plurality of spline teeth of the same lamination are positioned on the same circle.