Rotor of brushless motor

Abstract

The utility model relates to a rotor of a brushless motor, and belongs to the technical field of motor rotors. The rotor structure comprises a plurality of fan-shaped insertion blocks, an annular body and magnetic blocks arranged on the adjacent fan-shaped insertion blocks, the annular body and the fan-shaped insertion blocks are arranged in a split mode, and the annular body and the fan-shaped insertion blocks are fixed in an inserted mode. According to the invention, the processing difficulty is reduced, the manufacturing material is saved, and the independence between the opposite magnetic blocks is ensured.

Description

Technical Field

[0001] This application relates to the field of motor rotor technology, and in particular to a rotor for a brushless motor. Background Technology

[0002] The motor rotor is the rotating part of the motor and is an important component of the motor. The motor rotor and stator together constitute the motor.

[0003] Existing brushless motor rotor structure Figure 1 As shown, the device includes a metal support and magnetic blocks circumferentially disposed on the metal support. The metal support includes an annular body 2' and sector blocks 1' circumferentially disposed on the annular body. The annular body 2' and sector blocks 1' are integrally disposed, and there are insertion slots between adjacent sector blocks for inserting magnetic blocks 3'.

[0004] Regarding the aforementioned technologies, the annular body and the sector block are integrated, but the connection between the annular body and the sector block is relatively thin, which places high demands on the integrated processing of the metal support and results in high overall material costs. Utility Model Content

[0005] To reduce processing difficulty and production costs, this application provides a rotor for a brushless motor.

[0006] The rotor of a brushless motor provided in this application adopts the following technical solution:

[0007] A rotor for a brushless motor includes multiple sector-shaped inserts, an annular body, and magnetic blocks disposed adjacent to the sector-shaped inserts. The annular body and the sector-shaped inserts are separately disposed and are connected and fixed together.

[0008] By adopting the above technical solution, the separate setting of the annular body and the fan-shaped plug is less difficult to process than the one-piece molding, saving production materials. In addition, the annular body and the fan-shaped plug are fixed by plugging, which has the advantage of convenient assembly and reduces the overall production cost.

[0009] Optionally, the annular body is a one-piece molded plastic part.

[0010] By adopting the above technical solution, the ring body is a one-piece molded plastic product, which can be produced by injection molding, resulting in high production efficiency and high product precision. Compared with metal materials, it reduces production costs. At the same time, the insulating properties of plastic materials allow adjacent magnetic blocks to be in a relatively independent state. Compared with the existing one-piece metal bracket, it reduces the turbulence that occurs when current is transmitted to adjacent magnetic blocks.

[0011] Optionally, the outer side wall of the annular body is provided with a plurality of insertion slots, and the fan-shaped insertion block is provided with an insertion end that engages with the insertion slot.

[0012] By adopting the above technical solution, a method for connecting the annular body and the sector-shaped plug is disclosed. The annular body and the sector-shaped plug are fixed by the cooperation of the plug end and the plug groove. The plug connection method is simple and the assembly efficiency is high.

[0013] Optionally, the sidewall of the plug end is provided with a limiting chamfer for abutting against the inner wall of the plug groove.

[0014] By adopting the above technical solution and setting the limiting chamfer, the connection strength is improved and the probability of the plug end detaching from the plug slot is reduced after the plug end and the plug slot are matched.

[0015] Optionally, the insertion slot is arranged along the axis of the annular body, and one end of it penetrates one side end face of the annular body.

[0016] By adopting the above technical solution, one end of the insertion slot penetrates through the end face of the annular body, which makes it easier to insert the fan-shaped insertion block axially from one side end face of the annular body. Compared with inserting it radially from the side wall of the annular body, the assembly is more convenient.

[0017] Optionally, adjacent sector-shaped inserts are provided with arrangement slots for inserting the magnetic blocks, and the sector-shaped inserts are provided with a limiting portion facing the arrangement slot on the side away from the insertion end.

[0018] By adopting the above technical solution, when the magnetic block is inserted into the arrangement slot, the setting of the limiting part can limit the magnetic block, reduce the magnetic block from detaching from the side of the arrangement slot away from the annular body, and improve the installation stability of the magnetic block.

[0019] Optionally, the annular body is provided with an abutting edge corresponding to the arrangement groove, and the abutting edge abuts against the magnetic block.

[0020] By adopting the above technical solution, the ring body is made of plastic material. After the magnetic block is inserted, the abutment edge undergoes a certain elastic deformation. The abutment edge can exert a reverse clamping force on the magnetic block. Under the action of the limiting part and the abutment edge, the installation stability of the magnetic block is further improved.

[0021] Optionally, a fixing bracket is also included, which encapsulates and fixes the fan-shaped insert, the ring body, and the magnetic block through an injection molding process.

[0022] By adopting the above technical solution and setting up the fixed bracket, the sector-shaped insert, the ring body and the magnetic block can be tightly fixed together, thereby improving the overall strength and stability of the rotor.

[0023] Optionally, the annular body is provided with a plurality of first reinforcing grooves that penetrate both end faces in the circumferential direction.

[0024] By adopting the above technical solution, the setting of the first reinforcing groove allows the fluid to flow into the first reinforcing groove during the injection molding of the fixed bracket. After the fluid cools and solidifies, a columnar rod is formed in the first reinforcing groove, which improves the connection strength between the annular body and the fixed bracket.

[0025] Optionally, the fan-shaped insert has a second reinforcing groove that extends through both end faces.

[0026] By adopting the above technical solution, the second reinforcing groove is set so that after the fluid cools and solidifies, a columnar rod is formed in the second reinforcing groove, which improves the connection strength between the fan-shaped insert and the fixed bracket.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. This application reduces processing difficulty and saves processing materials by separating the fan-shaped insert and the ring body. The ring body is made of plastic, which can improve production efficiency. Adjacent magnetic blocks are in a relatively independent state.

[0029] 2. This application reduces the probability of the plug end detaching from the plug slot by setting limiting chamfers and abutment ridges, thereby improving the installation stability of the magnetic block in the arrangement slot;

[0030] 3. This application improves the connection strength between the fixed bracket, the annular body, and the sector-shaped insert by setting the first reinforcing groove and the second reinforcing groove. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the existing motor rotor structure in the background art.

[0032] Figure 2 This is a schematic diagram of the overall structure of an embodiment of this application.

[0033] Figure 3 This is an exploded view of the annular body and the sector-shaped insert according to an embodiment of this application.

[0034] Figure 4 This is an exploded view of the ring-shaped body, the sector-shaped insert, and the magnetic block assembled with the fixed bracket according to an embodiment of this application.

[0035] Explanation of reference numerals in the attached drawings: 1. Fan-shaped insert; 11. Insertion end; 111. Limiting chamfer; 12. Arrangement groove; 13. Limiting part; 14. Second reinforcing groove; 2. Ring body; 21. Insertion groove; 211. Positioning surface; 22. Abutment edge; 23. First reinforcing groove; 3. Magnetic block; 4. Fixing bracket. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 2-4 This application will be described in further detail.

[0037] This application discloses a rotor for a brushless motor.

[0038] Reference Figure 2 A rotor for a brushless motor includes multiple sector-shaped inserts 1, an annular body 2, and magnetic blocks 3 arranged alternately with the sector-shaped inserts 1.

[0039] The fan-shaped insert 1 and the annular body 2 are separate components. The annular body 2 is a regular polygon, and it has a through hole at its central axis that passes through both end faces for the shaft to pass through. In this application, the annular body 2 is integrally injection molded by an injection mold.

[0040] Reference Figure 2 and Figure 3 The outer wall of the annular body 2 is provided with a plurality of insertion slots 21 for inserting fan-shaped plugs 1 along its circumferential axis. In this embodiment, the annular body 2 has ten circumferentially spaced insertion slots 21. The insertion slots 21 extend along the axial direction of the annular body 2 and are located between adjacent sides. One end of the insertion slot 21 penetrates one end face of the annular body 2, and the other end forms a positioning surface 211 on the side wall of the annular body 2.

[0041] The sector-shaped insert 1 is made of metal materials such as cast steel or cast iron, and multiple sector-shaped inserts 1 are arranged concentrically around the axis of the annular body 2. The end of the sector-shaped insert 1 facing the annular body 2 is integrally provided with a plug-in end 11 for insertion into the plug-in groove 21. The length of the plug-in end 11 in the axial direction of the annular body 2 is less than the depth of the plug-in groove 21.

[0042] The two opposite side walls of the plug-in end 11 are also integrally provided with limiting chamfers 111. The limiting chamfers 111 abut against the side wall of the plug-in groove 21. After the plug-in end 11 is inserted into the plug-in groove 21, the limiting chamfers 111 cause the inner wall of the plug-in groove 21 to produce a certain elastic deformation, which can reduce the probability of the plug-in end 11 disengaging from the plug-in groove 21. In particular, two sets of limiting chamfers 111 are provided on both side walls of the plug-in end 11.

[0043] The sector-shaped inserts 1 are inserted one by one into the insertion slots 21, forming an arrangement slot 12 for inserting magnetic blocks 3 between adjacent sector-shaped inserts 1. The magnetic blocks 3 are inserted into the arrangement slots 12 with limiting portions 13 at both ends of the arc surface of the sector-shaped inserts 1 away from the insertion end 11. The limiting portions 13 extend circumferentially into the arrangement slots 12, and under the action of the limiting portions 13 of adjacent sector-shaped inserts 1, they can limit one side of the magnetic blocks 3 in the arrangement slots 12.

[0044] The annular body 2 also integrally provides an abutment ridge 22 on the inner wall of the arrangement groove 12. The abutment ridge 22 extends along the axis of the annular body 2 and is located in the middle of adjacent sector-shaped inserts 1. The cross-section of the abutment ridge 22 is triangular. When the magnetic block 3 is inserted into the arrangement groove 12, the magnetic block 3 abuts against the abutment ridge 22, causing the abutment ridge 22 to undergo elastic deformation. The abutment ridge 22 generates a directional pressing force on the magnetic block 3, which, with the cooperation of the limiting part 13, ensures the installation stability of the magnetic block 3 in the arrangement groove 12.

[0045] Combination Figure 4 To further improve the stability of the assembled sector-shaped plug 1, ring body 2, and magnetic block 3, and to facilitate connection with the motor shaft, this application also includes a fixing bracket 4. The fixing bracket 4 encloses the sector-shaped plug 1, ring body 2, and magnetic block 3 into a single unit.

[0046] The fixed bracket 4 is integrally formed by injection molding. During the molding process, the fan-shaped insert 1, the ring body 2 and the magnetic block 3 are initially assembled and then placed in the mold of the injection molding equipment for injection molding. The ring body 2 has a first reinforcing groove 23 that runs through both end faces. The first reinforcing groove 23 is a circular groove, which is arranged in a one-to-one correspondence with the abutment edge 22.

[0047] The fan-shaped insert 1 also has a second reinforcing groove 14 that runs through both end faces. The second reinforcing groove 14 is generally strip-shaped. By setting the first reinforcing groove 23 and the second reinforcing groove 14, the injection molding material can fill the first reinforcing groove 23 and the second reinforcing groove 14 when the fixed bracket 4 is injection molded. After cooling, a connecting body is formed, which is used to further increase the connection strength of the fan-shaped insert 1, the ring body 2 and the fixed bracket 4.

[0048] The implementation principle of the rotor of a brushless motor in this application embodiment is as follows: insert the sector-shaped plug 1 into the plug slot 21 one by one, and then insert the magnetic block 3 into the arrangement slot 12 of the adjacent sector-shaped plug 1; after the initial assembly of the three components is completed, they are placed into the injection mold and injection molded to form the fixing bracket 4. The sector-shaped plug 1, the ring body 2 and the magnetic block 3 are finally fixed by the fixing bracket 4.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A rotor for a brushless motor, characterized in that, It includes multiple sector-shaped plugs (1), an annular body (2) and magnetic blocks (3) disposed adjacent to the sector-shaped plugs (1). The annular body (2) and the sector-shaped plugs (1) are disposed separately and are connected and fixed together.

2. The rotor of a brushless motor according to claim 1, characterized in that, The ring-shaped body (2) is a one-piece molded plastic part.

3. The rotor of a brushless motor according to claim 1, characterized in that, The outer side wall of the annular body (2) is provided with a plurality of insertion slots (21) and the fan-shaped insertion block (1) is provided with an insertion end (11) that is inserted into the insertion slot (21).

4. The rotor of a brushless motor according to claim 3, characterized in that, The side wall of the plug end (11) is provided with a limiting chamfer (111) for abutting against the inner wall of the plug groove (21).

5. The rotor of a brushless motor according to claim 4, characterized in that, The insertion slot (21) is arranged along the axis of the annular body (2), and one end of it passes through one side end face of the annular body (2).

6. The rotor of a brushless motor according to claim 3, characterized in that, Adjacent fan-shaped inserts (1) are provided with arrangement slots (12) for inserting the magnetic block (3), and the fan-shaped inserts (1) are provided with a limiting part (13) facing the arrangement slots (12) on the side away from the insertion end (11).

7. The rotor of a brushless motor according to claim 6, characterized in that, The annular body (2) is provided with an abutting edge (22) corresponding to the arrangement groove (12), and the abutting edge (22) abuts against the magnetic block (3).

8. The rotor of a brushless motor according to claim 1, characterized in that, It also includes a fixing bracket (4), which uses an injection molding process to cover and fix the fan-shaped insert (1), the ring body (2) and the magnetic block (3).

9. The rotor of a brushless motor according to claim 8, characterized in that, The annular body (2) has multiple first reinforcing grooves (23) that penetrate both end faces in the circumferential direction.

10. The rotor of a brushless motor according to claim 8, characterized in that, The fan-shaped insert (1) has a second reinforcing groove (14) that runs through both ends.

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