A magnetic leakage-proof injection-molded rotor end cover and motor rotor assembly

Abstract

The utility model discloses a kind of anti-leakage magnetic injection molding rotor end cover and motor rotor assembly, anti-leakage magnetic injection molding rotor end cover includes injection molding bottom plate and sleeve portion extending from injection molding bottom plate edge, first through-hole for motor rotating shaft to pass through is provided in injection molding bottom plate middle, injection molding bottom plate and sleeve portion surround cavity to accommodate motor rotor, characterized by: the inside of the injection molding bottom plate is inlaid with a magnetic conducting bottom plate, the magnetic conducting bottom plate is a plane annular magnetic conducting sheet manufacturing, second through-hole is provided in magnetic conducting bottom plate middle, first through-hole and second through-hole position correspond, the inside of sleeve portion is inlaid with magnetic conducting sleeve, magnetic conducting sleeve is by magnetic conducting sheet and is wound into cylindrical shape. Its magnetic conducting bottom plate and magnetic conducting sleeve reduce eddy current loss, improve motor efficiency;Magnetic conducting bottom plate and magnetic conducting sleeve improve the tensile strength and compression resistance of injection molding part.

Description

Technical fields:

[0001] This utility model relates to a magnetic leakage-proof injection-molded rotor end cap and a motor rotor assembly. Background technology:

[0002] Currently, some permanent magnet motor rotors include a rotor core and permanent magnets. The permanent magnets are installed inside the rotor core and then integrally injection molded. The injection molded body integrates the rotor core and permanent magnets into one piece, and injection molded end plates are formed on both ends of the rotor core. For the specific structure, see the patent number: CN222915744U, patent name: a utility model patent for a rotor and motor.

[0003] The existing end caps covering the rotor core are injection-molded parts made of a single material, failing to consider losses due to magnetic leakage and insufficient tensile / compressive strength. Problems and shortcomings of the existing technology:

[0004] 1) The rotor core end cover is made of injection-molded material and cannot prevent magnetic leakage, which leads to a decrease in motor efficiency.

[0005] 2) Due to the inherent characteristics of injection molding, the rotor core end cap has insufficient tensile and compressive strength due to the single material injection molding. Summary of the Invention:

[0006] The purpose of this invention is to provide a magnetic leakage prevention injection-molded rotor end cover and motor rotor assembly, which solves the technical problems in the prior art where the rotor core end cover is made of only injection molding material and cannot play the role of preventing magnetic leakage, resulting in reduced motor efficiency due to magnetic leakage, and the lack of tensile / compressive strength due to single-material injection molding.

[0007] The objective of this utility model is achieved through the following technical solution:

[0008] A magnetic leakage-proof injection-molded rotor end cap includes an injection-molded base plate and a sleeve portion extending from the edge of the injection-molded base plate. The injection-molded base plate has a first through hole in the middle for a motor shaft to pass through. The injection-molded base plate and the sleeve portion form a cavity to accommodate the motor rotor. The feature is that a magnetically conductive base plate is embedded inside the injection-molded base plate. The magnetically conductive base plate is made of a flat annular magnetically conductive thin plate. A second through hole is provided in the middle of the magnetically conductive base plate. The first through hole and the second through hole are positioned correspondingly. A magnetically conductive sleeve is embedded inside the sleeve portion. The magnetically conductive sleeve is made of a magnetically conductive thin plate wound into a cylindrical shape.

[0009] Preferably, the magnetically conductive base plate is provided with several third through holes, which are located around the second through holes and are filled by the injection-molded base plate.

[0010] Preferably, a plurality of third through holes are evenly distributed circumferentially around the periphery of the second through hole.

[0011] Preferably, the magnetic sleeve is provided with a plurality of fourth through holes, and the sleeve portion is filled with the fourth through holes.

[0012] Preferably, the magnetic sleeve is provided with a plurality of fourth through holes arranged in multiple sets axially.

[0013] Preferably, the magnetically conductive thin plate is made of a high magnetic permeability material, and the injection-molded base plate and sleeve are integrally injection molded using BMC material.

[0014] The high magnetic permeability material mentioned refers to silicon steel, amorphous materials, or SPCC materials.

[0015] Preferably, reinforcing ribs are provided on the outer surfaces of the injection molded base plate and the sleeve portion.

[0016] Preferably, a mounting base is provided on the outer side of the sleeve, and a fifth through hole is provided in the middle of the mounting base for bolts to pass through.

[0017] An electric motor rotor assembly includes a rotor core, a shaft, a permanent magnet, and an injection-molded rotor end cap. The permanent magnet is mounted on the rotor core, the shaft is fitted inside the rotor core, and an injection-molded rotor end cap is fitted at each end of the rotor core. The characteristic of the injection-molded rotor end cap is that the above-mentioned anti-magnetic leakage injection-molded rotor end cap is used.

[0018] Compared with the prior art, this utility model has the following advantages:

[0019] Effect 1: This utility model's anti-magnetic leakage injection-molded rotor end cap includes an injection-molded base plate and a sleeve extending from the edge of the injection-molded base plate. The injection-molded base plate has a first through hole in the middle for the motor shaft to pass through. The injection-molded base plate and the sleeve form a cavity to accommodate the motor rotor. The key feature is that a magnetically conductive base plate is embedded inside the injection-molded base plate. The magnetically conductive base plate is made of a flat, annular magnetically conductive thin plate. A magnetically conductive sleeve is embedded inside the sleeve, which is made by winding the magnetically conductive thin plate into a cylindrical shape. The magnetically conductive base plate and the magnetically conductive sleeve reduce eddy current losses and improve motor efficiency.

[0020] Effect 2: The magnetic base plate and magnetic sleeve improve the tensile strength and compressive strength of the injection molded parts. Attached image description:

[0021] Figure 1 This is a perspective view of one embodiment of the present invention;

[0022] Figure 2 This is another perspective view of Embodiment 1 of this utility model;

[0023] Figure 3 This is an exploded view of one embodiment of the present invention;

[0024] Figure 4This is an exploded view from another angle of Embodiment 1 of this utility model;

[0025] Figure 5 This is a front view of Embodiment 1 of this utility model;

[0026] Figure 6 yes Figure 5 AA section view;

[0027] Figure 7 This is a structural cross-sectional view of Embodiment 2 of this utility model. Detailed implementation method:

[0028] The present invention will now be described in further detail through specific embodiments and in conjunction with the accompanying drawings.

[0029] Example 1:

[0030] like Figures 1 to 6 As shown, this embodiment provides a magnetic leakage-proof injection-molded rotor end cap, including an injection-molded base plate 1 and a sleeve portion 2 extending from the edge of the injection-molded base plate 1. The injection-molded base plate 1 has a first through hole 11 in the middle for the motor shaft to pass through. The injection-molded base plate 1 and the sleeve portion 2 form a cavity 3 to accommodate the motor rotor. The feature is that a magnetically conductive base plate 6 is embedded inside the injection-molded base plate 1. The magnetically conductive base plate 6 is made of a flat annular magnetically conductive thin plate. A second through hole 61 is provided in the middle of the magnetically conductive base plate 6. The first through hole 11 and the second through hole 61 are positioned correspondingly. A magnetically conductive sleeve 7 is embedded inside the sleeve portion 2. The magnetically conductive sleeve 7 is made of a magnetically conductive thin plate wound into a cylindrical shape.

[0031] Compared with the prior art, this utility model has the following advantages: 1. The anti-magnetic leakage injection molded rotor end cap of this utility model includes an injection molded base plate 1 and a sleeve portion 2 extending from the edge of the injection molded base plate 1. The injection molded base plate 1 has a first through hole 11 in the middle for the motor shaft to pass through. The injection molded base plate 1 and the sleeve portion 2 form a cavity 3 to accommodate the motor rotor. The key feature is that a magnetically conductive base plate 6 is embedded inside the injection molded base plate 1. The magnetically conductive base plate is made of a flat annular magnetically conductive thin plate. A magnetically conductive sleeve 7 is embedded inside the sleeve portion 2. The magnetically conductive sleeve is made of a magnetically conductive thin plate wound into a cylindrical shape. The magnetically conductive base plate and the magnetically conductive sleeve reduce eddy current losses and improve motor efficiency; 2. The magnetically conductive base plate and the magnetically conductive sleeve improve the tensile strength and compressive strength of the injection molded part.

[0032] Preferably, the magnetic base plate 6 is provided with a plurality of third through holes 62, which are located around the second through holes 61. The third through holes 62 are filled by the injection molded base plate 1. The structure is simple and can increase the bonding force between the injection molded base plate 1 and the magnetic base plate 6.

[0033] Preferably, a plurality of third through holes 62 are evenly distributed circumferentially around the periphery of the second through hole 61. The structure is simple and the stress is uniform.

[0034] Preferably, the magnetic sleeve 7 is provided with a plurality of fourth through holes 71, and the sleeve portion 2 is filled with the fourth through holes 71, which can increase the bonding force between the magnetic sleeve 7 and the sleeve portion 2.

[0035] Preferably, the magnetic sleeve 7 is provided with a plurality of fourth through holes 71, which are arranged in multiple sets along the axis. The structure is simple and the layout is reasonable.

[0036] Preferably, the magnetically conductive thin plate is made of a high magnetic permeability material, and the injection-molded base plate 1 and the sleeve part 2 are integrally injection molded from BMC material, which is easy to obtain.

[0037] Preferably, the high magnetic permeability material refers to silicon steel, amorphous material, or SPCC material.

[0038] Preferably, the outer surfaces of the injection base plate 1 and the sleeve portion 2 are provided with reinforcing ribs 4 to increase structural strength.

[0039] Preferably, a mounting base 23 is provided on the outer side of the sleeve portion 2, and a fifth through hole 231 is provided in the middle of the mounting base 23 for bolts to pass through, which makes installation simple and the structure simple.

[0040] Example 2:

[0041] like Figure 7 As shown, this embodiment provides a motor rotor assembly, including a rotor core 101, a shaft 102, a permanent magnet 103, and an injection-molded rotor end cap 100. The permanent magnet 103 is mounted on the rotor core 101, and the shaft 102 is fitted inside the rotor core 101. An injection-molded rotor end cap 100 is fitted at each end of the rotor core 101. The injection-molded rotor end cap 100 is characterized in that it is a type of anti-magnetic leakage injection-molded rotor end cap as described in Embodiment 1. The magnetic base plate and magnetic sleeve reduce eddy current losses and improve motor efficiency; the magnetic base plate and magnetic sleeve also improve the tensile strength and compressive strength of the injection-molded part.

[0042] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited thereto. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model are equivalent substitutions and are included within the protection scope of the present utility model.

Claims

1. A magnetic leakage-proof injection-molded rotor end cap, comprising an injection-molded base plate (1) and a sleeve portion (2) extending from the edge of the injection-molded base plate (1), wherein the injection-molded base plate (1) has a first through hole (11) in the middle for a motor shaft to pass through, and the injection-molded base plate (1) and the sleeve portion (2) form a cavity (3) to accommodate the motor rotor, characterized in that: The injection base plate (1) is inlaid with a magnetic base plate (6). The magnetic base plate (6) is made of a flat annular magnetic thin plate. The magnetic base plate (6) has a second through hole (61) in the middle. The first through hole (11) and the second through hole (61) are in the same position. The sleeve part (2) is inlaid with a magnetic sleeve (7). The magnetic sleeve (7) is made of a magnetic thin plate wound into a cylindrical shape.

2. The anti-magnetic leakage injection molded rotor end cap according to claim 1, characterized in that: The magnetic base plate (6) is provided with several third through holes (62), the third through holes (62) are located outside the second through holes (61), and the third through holes (62) are filled by the injection molded base plate (1).

3. The anti-magnetic leakage injection molded rotor end cap according to claim 2, characterized in that: Several third through holes (62) are evenly distributed circumferentially around the second through hole (61).

4. A magnetic leakage-proof injection-molded rotor end cap according to claim 1, 2, or 3, characterized in that: The magnetic sleeve (7) is provided with several fourth through holes (71), and the sleeve part (2) fills the fourth through holes (71).

5. The anti-magnetic leakage injection molded rotor end cap according to claim 4, characterized in that: The magnetic sleeve (7) is provided with several fourth through holes (71), which are arranged in multiple axial groups.

6. The anti-magnetic leakage injection molded rotor end cap according to claim 5, characterized in that: The magnetically conductive thin plate is made of a high magnetic permeability material, and the injection-molded base plate (1) and sleeve part (2) are integrally injection molded using BMC material.

7. The anti-magnetic leakage injection molded rotor end cap according to claim 6, characterized in that: The high magnetic permeability material mentioned refers to silicon steel, amorphous materials, or SPCC materials.

8. The anti-magnetic leakage injection molded rotor end cap according to claim 6, characterized in that: The outer surfaces of the injection base plate (1) and the sleeve part (2) are provided with reinforcing ribs (4).

9. The anti-magnetic leakage injection molded rotor end cap according to claim 8, characterized in that: A mounting base (23) is provided on the outer side of the sleeve part (2), and a fifth through hole (231) is provided in the middle of the mounting base (23) for bolts to pass through.

10. A motor rotor assembly, comprising a rotor core (101), a shaft (102), a permanent magnet (103), and injection-molded rotor end caps (100), wherein the permanent magnet (103) is mounted on the rotor core (101), the shaft (102) is fitted inside the rotor core (101), and an injection-molded rotor end cap (100) is fitted at each end of the rotor core (101), characterized in that: The injection-molded rotor end cap (100) is an anti-magnetic leakage injection-molded rotor end cap as described in any one of claims 1 to 9.

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