An assembly structure of a rotor and a housing of an electric machine

Abstract

An assembly structure for a motor rotor and housing includes a rotor and a housing. The housing has a mounting groove with a central shaft at its center. The rotor includes an injection-molded ferrite magnetic ring and a rotor shaft. The injection-molded ferrite magnetic ring is mounted in the mounting groove, and the rotor shaft is fitted onto the central shaft. Several elastic supports are distributed around the rotor shaft, with one end of each support abutting against the injection-molded ferrite magnetic ring, allowing the rotor shaft to move elastically up and down on the ring via the elastic supports. The motor rotor of this invention uses an injection-molded ferrite magnetic ring, a composite material made by combining ferrite powder with plastic. The plastic absorbs vibration, is not easily broken, improves the rotor's impact resistance, and makes the rotor's performance more stable. Furthermore, the elastic movement of the rotor shaft on the injection-molded ferrite magnetic ring via the elastic supports eliminates the gap between the rotor and the motor housing after the rotor is installed.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to an assembly structure for the rotor and housing of an electric motor. Background Technology

[0002] Chinese Patent Document No. CN215835304U, published on February 15, 2022, discloses a high-efficiency, stable, and quiet claw-pole permanent magnet synchronous motor. The motor includes a bracket on the motor, with upper pole claws formed by die-cutting and inward turning on the bracket, each upper pole claw having the same width and curvature; and / or, lower pole claws formed by die-cutting and inward turning on the housing, each lower pole claw having the same width, curvature, and height, with an included angle of 45° between adjacent pole claws. Elastic elements are provided on the rotor teeth, pressing against the rotor teeth during assembly. This synchronous motor effectively reduces axial movement noise caused by rotor stress by providing elastic elements on the rotor teeth, which are a combination of planar and cylindrical springs. However, the combination of planar and cylindrical springs complicates the rotor structure and increases assembly difficulty. Furthermore, the rotor performance of this synchronous motor is unstable, and its impact resistance is generally poor.

[0003] Therefore, further improvements are necessary. Utility Model Content

[0004] The purpose of this utility model is to provide an assembly structure for the rotor and housing of a motor that is simple in structure, low in noise, easy to assemble, stable in performance, and highly practical, so as to overcome the shortcomings of the prior art.

[0005] An assembly structure for a motor rotor and housing designed for this purpose includes a rotor and a housing, characterized in that: the housing is provided with a mounting groove, a central shaft is provided at the center of the mounting groove, the rotor includes an injection-molded ferrite magnetic ring and a rotor shaft, the injection-molded ferrite magnetic ring is mounted on the mounting groove, the rotor shaft is fitted on the central shaft, and a plurality of elastic support arms are distributed around the circumference of the rotor shaft, one end of the elastic support arm abuts against the injection-molded ferrite magnetic ring, so that the rotor shaft can move up and down elastically on the injection-molded ferrite magnetic ring through the elastic support arms.

[0006] The rotor also includes a bottom cover, which is installed at the bottom of the injection-molded ferrite magnetic ring, and the injection-molded ferrite magnetic ring is fitted onto the central shaft through the bottom cover.

[0007] The bottom of the cover is provided with a support part, and the bottom of the mounting groove is provided with a support surface. The bottom cover is supported on the support surface by the support part.

[0008] The support extends beyond the bottom of the injection-molded ferrite magnetic ring, allowing the injection-molded ferrite magnetic ring to be suspended and mounted on the mounting groove.

[0009] The bottom cover has a first positioning post at its center, and the injection-molded ferrite magnetic ring has a first positioning hole at its center, with the first positioning post passing through the first positioning hole.

[0010] The first positioning post has a first shaft hole, the rotor shaft has a second shaft hole, and the central shaft passes through both the first shaft hole and the second shaft hole.

[0011] The bottom cover has several second positioning posts distributed around its perimeter, and the injection-molded ferrite magnetic ring has several second positioning holes distributed on its surface. The second positioning posts pass through the second positioning holes. The bottom of the injection-molded ferrite magnetic ring is provided with a positioning mounting groove, and the bottom cover is positioned and mounted on the positioning mounting groove.

[0012] The injection-molded ferrite magnetic ring has a receiving groove at the bottom, and the bottom cover is pressed onto the receiving groove.

[0013] The top of the injection-molded ferrite magnetic ring has several notches, and a limiting surface is provided at the bottom of the notches. One end of the elastic support arm extends into the notch and abuts against the limiting surface. A limiting ring is integrally provided on the rotor shaft, and the elastic support arm extends integrally to the outside of the limiting ring.

[0014] The injection-molded ferrite magnetic rings are made of PA6 injection-molded ferrite, PA66 injection-molded ferrite, PA46 injection-molded ferrite, or PA12 injection-molded ferrite.

[0015] The motor rotor of this invention uses an injection-molded ferrite magnetic ring. This injection-molded ferrite magnetic ring is a composite material made by combining ferrite magnetic powder with plastic. The plastic absorbs vibration, is not easily broken, improves the rotor's impact resistance, and makes the rotor's performance more stable. Furthermore, the injection-molded rotor makes rotor manufacturing more efficient and environmentally friendly. When used in conjunction with the stator, the injection-molded rotor achieves the same performance while saving on enameled wire. In addition, by distributing several elastic support arms around the circumference of the rotor shaft, the rotor shaft moves elastically up and down on the injection-molded ferrite magnetic ring via these arms. This eliminates the gap between the rotor and the motor housing after the rotor is installed, preventing the rotor from undulating along the central axis during rotation, thus improving noise. The elastic support arms are integrally set on the rotor shaft, making the rotor structure simpler and eliminating the need to consider assembly issues. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the assembly structure in the first application example of an embodiment of this utility model.

[0017] Figure 2 This is a cross-sectional view of the assembly structure in the first application example of an embodiment of this utility model.

[0018] Figure 3 This is an exploded view of the assembly structure in the first application example of an embodiment of the present utility model.

[0019] Figure 4 This is a partial exploded view of the assembly structure in the first application example of an embodiment of this utility model.

[0020] Figure 5 This is an exploded structural diagram of the injection-molded ferrite magnetic ring and the bottom cover in the first application example of an embodiment of this utility model.

[0021] Figure 6 This is a schematic diagram of the overall structure of the rotor in a second application example of an embodiment of this utility model.

[0022] Figure 7 This is an exploded structural diagram of the rotor in a second application example of an embodiment of the present invention.

[0023] Figure 8 This is a cross-sectional view of the rotor in a second application example of an embodiment of this utility model.

[0024] Figure 9 This is an exploded structural diagram of the rotor in another position in a second application example of an embodiment of this utility model. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] See Figures 1-9 The assembly structure of the rotor and housing of this motor includes rotor a and housing 1. The housing 1 is provided with a mounting groove 2, and a central shaft 3 is provided at the center of the mounting groove 2 (housing 1). Rotor a includes injection-molded ferrite magnetic ring 4 and rotor shaft 5. The injection-molded ferrite magnetic ring 4 is installed on the mounting groove 2, and the rotor shaft 5 is fitted on the central shaft 3. Several elastic support arms 6 are distributed in a ring around the circumference of the rotor shaft 5. The lower end of the elastic support arm 6 abuts against the injection-molded ferrite magnetic ring 4, so that the rotor shaft 5 can move up and down elastically on the injection-molded ferrite magnetic ring 4 through the elastic support arms 6. The motor includes a motor housing, which includes housing 1 and a top cover (not shown in the figure) covering the top of housing 1. The injection-molded ferrite magnetic ring 4 supports housing 1, and the rotor shaft 2 supports the top cover.

[0027] The rotor a also includes a bottom cover 7, which is installed at the bottom of the injection-molded ferrite magnetic ring 4. The injection-molded ferrite magnetic ring 4 is fitted onto the central shaft 3 through the bottom cover 7.

[0028] The bottom cover 7 is provided with a support part 10, and the bottom of the mounting groove 2 is provided with a support surface 11. The bottom cover 7 is supported on the support surface 11 by the support part 10.

[0029] The support portion 10 extends beyond the bottom of the injection-molded ferrite magnetic ring 4, so that the injection-molded ferrite magnetic ring 4 is suspended and mounted on the mounting groove 2, so that the injection-molded ferrite magnetic ring 4 can rotate on the mounting groove 2.

[0030] The bottom of the housing 1 has several openings 19 arranged in a ring. One end of each opening 19 is provided with a pole claw 20. There is a gap between two adjacent pole claws 20. The pole claws 20 are arranged in a ring, and the ring forms a mounting groove 2. This motor is a pole claw type synchronous motor.

[0031] The bottom cover 7 has a first positioning post 12 at its center, and the injection-molded ferrite magnetic ring 4 has a first positioning hole 13 at its center. The first positioning post 12 passes through the first positioning hole 13 so that the bottom cover 7 is positioned at the bottom of the injection-molded ferrite magnetic ring 4.

[0032] The first positioning post 12 is provided with a first shaft hole 14, and the rotor shaft 5 is provided with a second shaft hole 15. The central shaft 3 passes through both the first shaft hole 14 and the second shaft hole 15, so that the rotor a can rotate around the central shaft 3.

[0033] The bottom cover 7 has several second positioning posts 16 distributed around its periphery, and several second positioning holes 17 distributed on the injection-molded ferrite magnetic ring 4. The second positioning posts 16 pass through the second positioning holes 17, which also makes the bottom cover 7 positioned at the bottom of the injection-molded ferrite magnetic ring 4 and improves the positioning effect. The bottom of the injection-molded ferrite magnetic ring 4 is provided with a positioning mounting groove 21, and the bottom cover 7 is positioned and mounted on the positioning mounting groove 21.

[0034] The injection-molded ferrite magnetic ring 4 has a receiving groove 22 at its bottom, and the bottom cover 7 is pressed onto the receiving groove 22. The injection-molded ferrite magnetic ring 4 and the bottom cover 7 are separate parts and are not integrally injection molded. They are pressed together by a pressing process.

[0035] The injection-molded ferrite magnetic ring 4 has several notches 8 distributed in a ring at the top. A limiting surface 9 is provided at the bottom of the notch 8. The lower end of the elastic support arm 6 extends into the notch 8 and abuts against the limiting surface 9 to make the contact stress distribution more uniform. The elastic support arm 6 is set up at an angle to support the rotor shaft 5.

[0036] Limiting rings 18 are integrally provided on both sides of the rotor shaft 5, and elastic arms 6 are integrally extended and provided on the outside of the limiting rings 18, and the elastic arms 6 are respectively provided at both ends of the limiting rings 18.

[0037] Alternatively, a limiting ring 18 is integrally provided on the outer circumference of the rotor shaft 5, and an elastic support arm 6 is integrally extended and provided on the outer side of the limiting ring 18, with the elastic support arm 6 respectively provided on the periphery of the limiting ring 18.

[0038] The injection-molded ferrite magnetic ring 4 is made of PA6 injection-molded ferrite, PA66 injection-molded ferrite, PA46 injection-molded ferrite, or PA12 injection-molded ferrite. The injection-molded ferrite magnetic ring 4 is a composite material magnetic ring made by combining ferrite magnetic powder with plastic. The plastic can absorb vibration, is not easy to break, improves the rotor's impact resistance, is suitable for dynamic environments, improves the rotor's performance, and the plastic has high corrosion resistance, making the rotor suitable for more harsh environments.

[0039] The above describes the preferred embodiments of this utility model, illustrating and describing its basic principles, main features, and advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made without departing from the spirit and scope of this utility model, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An assembly structure for a rotor and housing of an electric motor, comprising a rotor (a) and a housing (1), characterized in that: The housing (1) is provided with a mounting groove (2), and a central shaft (3) is provided at the center of the mounting groove (2). The rotor (a) includes an injection-molded ferrite magnetic ring (4) and a rotor shaft (5). The injection-molded ferrite magnetic ring (4) is installed on the mounting groove (2), and the rotor shaft (5) is fitted on the central shaft (3). Several elastic arms (6) are distributed around the rotor shaft (5). One end of the elastic arm (6) abuts against the injection-molded ferrite magnetic ring (4) so ​​that the rotor shaft (5) can move up and down elastically on the injection-molded ferrite magnetic ring (4) through the elastic arm (6).

2. The assembly structure of the rotor and housing of the motor according to claim 1, characterized in that: The rotor (a) also includes a bottom cover (7), which is installed at the bottom of the injection-molded ferrite magnetic ring (4), and the injection-molded ferrite magnetic ring (4) is fitted onto the central shaft (3) through the bottom cover (7).

3. The assembly structure of the rotor and housing of the motor according to claim 2, characterized in that: The bottom cover (7) is provided with a support part (10), and the bottom of the mounting groove (2) is provided with a support surface (11). The bottom cover (7) is supported on the support surface (11) by the support part (10).

4. The assembly structure of the rotor and housing of the motor according to claim 3, characterized in that: The support (10) extends beyond the bottom of the injection-molded ferrite magnetic ring (4) so ​​that the injection-molded ferrite magnetic ring (4) is suspended and mounted on the mounting groove (2).

5. The assembly structure of the rotor and housing of the motor according to claim 2, characterized in that: The bottom cover (7) has a first positioning post (12) at its center, and the injection-molded ferrite magnetic ring (4) has a first positioning hole (13) at its center. The first positioning post (12) passes through the first positioning hole (13).

6. The assembly structure of the rotor and housing of the motor according to claim 5, characterized in that: The first positioning post (12) is provided with a first shaft hole (14), and the rotor shaft (5) is provided with a second shaft hole (15). The central shaft (3) passes through both the first shaft hole (14) and the second shaft hole (15).

7. The assembly structure of the rotor and housing of the motor according to claim 6, characterized in that: The bottom cover (7) has several second positioning posts (16) distributed around its periphery, and the injection-molded ferrite magnetic ring (4) has several second positioning holes (17) distributed on its surface. The second positioning posts (16) pass through the second positioning holes (17). The bottom of the injection-molded ferrite magnetic ring (4) is provided with a positioning mounting groove (21), and the bottom cover (7) is positioned and mounted on the positioning mounting groove (21).

8. The assembly structure of the rotor and housing of the motor according to claim 6, characterized in that: The injection-molded ferrite magnetic ring (4) has a receiving groove (22) at the bottom, and the bottom cover (7) is pressed onto the receiving groove (22).

9. The assembly structure of the rotor and housing of the motor according to claim 2, characterized in that: The injection-molded ferrite magnetic ring (4) has several notches (8) distributed on the top. A limiting surface (9) is provided at the bottom of the notch (8). One end of the elastic support arm (6) extends into the notch (8) and abuts against the limiting surface (9). A limiting ring (18) is integrally provided on the rotor shaft (5). The elastic support arm (6) is integrally extended and provided on the outside of the limiting ring (18).

10. The assembly structure of the rotor and housing of the electric motor according to any one of claims 1-9, characterized in that: The injection-molded ferrite magnetic ring (4) is made of PA6 injection-molded ferrite, PA66 injection-molded ferrite, PA46 injection-molded ferrite or PA12 injection-molded ferrite.

Images