Surface-mounted rotor structure

Abstract

The utility model provides a surface-mounted rotor structure, a rotor shaft is provided with a positioning groove for embedding magnetic steel in a surface-mounted manner, the groove length direction of the positioning groove is consistent with the shaft length direction of the rotor shaft, the groove opening of the positioning groove faces outwards in the radial direction, the groove bottom of the positioning groove is provided with a glue groove with the groove opening facing outwards in the radial direction, and in the process of pushing in the magnetic steel, the glue groove faces outwards in the radial direction. The glue in the glue groove can be adhered to the back of the magnetic steel, and the connection stability of the magnetic steel and the rotor shaft is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and in particular relates to a surface-mounted rotor structure. Background Art

[0002] Permanent magnet synchronous motors usually use surface-mount or built-in magnetic circuits. The magnets on the rotor of surface-mount motors are generally tile-shaped and fit tightly to the surface of the rotor body. Therefore, in order to prevent the magnets from moving under the action of electromagnetic force, adhesive is generally applied to the fitting surface of the magnets and the rotor to bond the magnets to the rotor.

[0003] For example, the article entitled "Gluing structure of surface-mounted magnet and rotor of motor and bonding method thereof" (publication number: CN108183567 B) discloses a surface-mounted magnet adhered to the surface of the rotor shaft. The surface of the rotor shaft is provided with a glue groove structure corresponding to the surface-mounted magnet. The glue groove structure includes a main glue groove and two glue diversion storage grooves. In the above scheme, after the main glue groove is filled with glue, the magnet is positioned to the corresponding position of the glue groove structure, and the raised part of the magnet sinks into the main glue groove. The glue groove structures on the magnet and the rotor shaft cooperate with each other to squeeze the glue in the main glue groove into the glue diversion storage groove. The glue in the main glue groove flows out of the glue diversion storage groove. The glue diversion storage groove only has a diversion function. Utility Model Content

[0004] The utility model provides a surface-mounted rotor structure, which aims to ensure the connection stability between the magnetic steel and the rotor shaft.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A surface-mounted rotor structure is provided with a positioning groove for surface-mounted embedded magnetic steel on the rotor shaft. The groove length direction of the positioning groove is consistent with the axial length direction of the rotor shaft and the groove opening of the positioning groove is radially outward. The groove bottom of the positioning groove is provided with a rubber groove with the groove opening radially outward.

[0007] In the above scheme, a positioning groove for surface-mounted embedded magnets is provided on the rotor shaft, and a glue groove with the groove opening radially outward is provided on the bottom of the positioning groove. During the process of pushing the magnet in, the glue in the glue groove can ensure that it sticks to the back of the magnet, thereby ensuring the stability of the connection between the magnet and the rotor shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural diagram of the utility model;

[0009] Figure 2 This is a schematic diagram of the structure of the axial groove and the circumferential groove in the utility model;

[0010] Figure 3 yes Figure 2 Magnified image of;

[0011] Figure 4 It is a specific implementation of the oblique groove in the utility model. DETAILED DESCRIPTION

[0012] A surface-mounted rotor structure is provided, wherein a positioning groove 10 for surface-mounted embedded magnetic steel 2 is provided on the rotor shaft 1. The groove length direction of the positioning groove 10 is consistent with the axial length direction of the rotor shaft 1 and the groove opening of the positioning groove 10 is radially outward. The groove bottom 11 of the positioning groove 10 is provided with a rubber groove 20 with the groove opening radially outward.

[0013] In the above scheme, the magnet 2 is embedded in the positioning groove 10 on the rotor shaft 1. The bottom 11 of the positioning groove 10 is provided with a glue groove 20 with the groove opening radially outward. When the magnet 2 is pushed into the positioning groove 10, the glue applied on the bottom 11 of the positioning groove 10 will be squeezed out along the groove length direction of the positioning groove 10. At this time, some glue still remains in the glue groove 20. The groove depth of the glue groove 20 is less than the curing gap of the glue, thereby ensuring that the magnet 2 is adhered and fixed by the glue accumulated in the glue groove 20.

[0014] The preferred positioning groove 10 is in a closed shape as a whole. The closed-shaped positioning groove 10 can limit the radial outward displacement of the magnetic steel 2, constrain the radial direction of the magnetic steel 2, and ensure that the magnetic steel 2 is fixed in the radial direction.

[0015] Furthermore, the glue groove 20 includes an axial groove 21 whose groove length direction is consistent with the axial direction, and the magnet 2 is bonded and fixed through the axial groove 21. Of course, the glue groove 20 can also include a circumferential groove 22 whose groove length direction is consistent with the circumferential direction, and the magnet 2 is bonded and fixed in the circumferential direction. The preferred glue groove 20 includes an oblique groove 23 whose groove length direction intersects with the circumferential direction or the axial direction, and the oblique groove 23 bonds and fixes the magnet 2 in both the axial and circumferential directions.

[0016] The preferred circumferential grooves 22 and / or oblique grooves 23 divide the adhesive groove 20 into at least two sections along the groove length of the adhesive groove 20. In the above solution, multiple groups of circumferential grooves 22 and / or oblique grooves 23 can be provided along the groove length of the adhesive groove 20. By increasing the number of adhesive grooves 20, the bonding area is increased, ensuring the stability of the connection between the magnet 2 and the rotor shaft 1.

[0017] Furthermore, the axial groove 21 and the circumferential groove 22 at the bottom of the glue groove 20 are arranged through each other, and the axial grooves 21 located on both sides of the same circumferential groove 22 are staggered in the circumferential direction.

[0018] In the above scheme, three groups of magnets 2 are arranged in the positioning groove 10 on the rotor shaft 1. During the actual operation, that is, when the magnets are pushed in, one magnet can be pushed into the middle position first, and then the magnets at both ends can be pushed in from both sides, and the glue applied on the bottom 11 of the positioning groove 10 can be squeezed into the glue groove 20 as much as possible. According to the above-mentioned order of pushing out the magnets, there will be sufficient glue in the axial groove 21 and the circumferential groove 22 arranged through it, so as to bond and fix the magnets 2. At the same time, the axial grooves 21 on both sides of the same circumferential groove 22 are staggered in the circumferential direction, so that the bonding positions of the three groups of magnets 2 and the glue groove 20 are different, which helps to resist external forces and avoid displacement.

[0019] Preferably, the back surface of the magnetic steel 2 has a recess 2A, which is opposite to the circumferential groove 22 and / or the oblique groove 23 .

[0020] In the above scheme, there is a recessed portion 2A on the back of the magnetic steel 2. The recessed portion 2A can be a groove that matches the circumferential groove 22 and / or the oblique groove 23. The recessed portion 2A is opposite to the circumferential groove 22 and / or the oblique groove 23. The glue is located in the recessed portion 2A and forms a key with the circumferential groove 22 and / or the oblique groove 23. The recessed portion 2A and the circumferential groove 22 and / or the oblique groove 23 form a keyway. The glue forms a key and a keyway in the keyway, which can provide a limiting effect on the displacement of the magnetic steel 2 in the axial and circumferential directions, thereby ensuring the stability of the connection between the magnetic steel 2 and the rotor shaft 1.

Claims

1. A surface-mounted rotor structure, wherein a positioning groove (10) for embedding a surface-mounted magnetic steel (2) is provided on a rotor shaft (1), wherein the groove length direction of the positioning groove (10) is consistent with the axial length direction of the rotor shaft (1) and the notch of the positioning groove (10) is radially outward, characterized in that: A glue groove (20) with a groove opening facing radially outward is provided on the groove bottom (11) of the positioning groove (10).

2. The surface-mounted rotor structure according to claim 1, characterized in that: The positioning groove (10) is in a closed shape as a whole.

3. The surface-mounted rotor structure according to claim 1, characterized in that: The glue groove (20) comprises an axial groove (21) whose groove length direction is consistent with the axial direction.

4. The surface-mounted rotor structure according to claim 1, characterized in that: The glue groove (20) comprises a circumferential groove (22) whose groove length direction is consistent with the circumferential direction.

5. The surface-mounted rotor structure according to claim 1, characterized in that: The glue groove (20) comprises an oblique groove (23) whose groove length direction intersects with the circumferential direction or the axial direction.

6. The surface-mounted rotor structure according to claim 4, characterized in that: The circumferential groove (22) and / or the oblique groove (23) divide the glue groove (20) into at least two sections in the groove length direction of the glue groove (20).

7. The surface-mounted rotor structure according to claim 3 or 4, characterized in that: The axial groove (21) and the circumferential groove (22) at the bottom of the glue groove (20) are arranged through, and the axial grooves (21) located on both sides of the same circumferential groove (22) are staggered in the circumferential direction.

8. The surface-mounted rotor structure according to claim 4 or 5, characterized in that: The back of the magnetic steel (2) has a recess (2A), and the recess (2A) is opposite to the circumferential groove (22) and / or the oblique groove (23).

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