CN216216150U - Rotor magnet assembly - Google Patents
Rotor magnet assembly Download PDFInfo
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- CN216216150U CN216216150U CN202122020758.XU CN202122020758U CN216216150U CN 216216150 U CN216216150 U CN 216216150U CN 202122020758 U CN202122020758 U CN 202122020758U CN 216216150 U CN216216150 U CN 216216150U
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Abstract
The utility model discloses a rotor magnet assembly, which comprises a rotor shell, wherein a shell edge vertical to the rotor shell is formed on the circumferential part of the rotor shell, a plurality of magnet bodies are attached to the inner side surface of the shell edge, the magnet bodies are respectively arranged side by side along the circumferential direction in an array manner, and two adjacent magnet bodies are mutually and closely matched; the magnet assembly is formed by combining three adjacent magnet bodies, the magnetizing directions of the two adjacent magnet assemblies are opposite inside and outside, the magnet assembly arranged outwards in the magnetizing direction is a first magnet assembly, the magnet assembly arranged inwards in the magnetizing direction is a second magnet assembly, and the first magnet assembly and the second magnet assembly are arranged in an array mode alternately in the circumferential direction. Compared with the prior art, the magnetic pole structure formed by the first magnet assembly bodies and the second magnet assembly bodies which are alternately arranged improves the consistency of the magnetic poles of the permanent magnet of the whole motor, and reduces the thrust fluctuation, the torque fluctuation and the noise of the motor in the operation process.
Description
Technical Field
The utility model relates to the technical field of direct drive motors, in particular to a rotor magnet assembly.
Background
The permanent magnet motor generates torque through interaction of stator current and a rotor permanent magnet, and has the advantages of small size, light weight, large torque and the like. The traditional motor generally adopts surface-mounted permanent magnets, namely the permanent magnets are mounted on the peripheral surface of a rotor, and the magnetizing directions of two adjacent permanent magnets are opposite. However, such a surface-mounted permanent magnet has the following problems: the magnetic flux density of the magnetic pole cannot achieve higher consistency due to the limitations of production raw materials, a magnetizing process and the like, and the difference is mainly that when the permanent magnet is used as the magnetic pole, the difference value of the magnetic flux density on two sides of the magnetic pole is larger, and macroscopically shows that all magnetizing directions are inconsistent, so that parameters such as thrust fluctuation, torque fluctuation and noise of an actual motor are greatly different from the level of theoretical design, and therefore improvement is needed.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a rotor magnet assembly to solve the problems of large difference and poor consistency of magnetic flux densities of permanent magnet magnetic poles of the existing direct-drive motor, and further solve the problems of thrust fluctuation, torque fluctuation, high noise and the like of the direct-drive motor.
In order to achieve the purpose, the utility model adopts the technical scheme that: a rotor magnet assembly comprises a rotor shell, wherein a shell edge vertical to the rotor shell is formed on the circumferential part of the rotor shell, a plurality of magnet bodies are attached to the inner side surface of the shell edge, the magnet bodies are arranged side by side along the circumferential direction in an array mode, and two adjacent magnet bodies are mutually matched in a close fit mode; the magnet assembly is formed by combining three adjacent magnet bodies, the magnetizing directions of the two adjacent magnet assemblies are opposite inside and outside, the magnet assembly arranged outwards in the magnetizing direction is a first magnet assembly, the magnet assembly arranged inwards in the magnetizing direction is a second magnet assembly, and the first magnet assembly and the second magnet assembly are arranged in an array mode alternately in the circumferential direction.
In a further technical scheme, the first magnet assembly comprises a first middle magnet and two first side magnets, wherein the magnetizing directions of the first middle magnet are outwards arranged respectively, the two first side magnets are respectively positioned at two sides of the first middle magnet, the magnetizing directions of the first middle magnet are outwards arranged along the radial direction, the magnetizing directions of the first side magnets are symmetrically arranged respectively by taking the magnetizing direction of the first middle magnet as two sides of a symmetry axis, the magnetizing directions of the first middle magnet and the magnetizing directions of the first side magnets at two sides form a first included angle a with the same size respectively, the second magnet assembly comprises a second middle magnet and two second side magnets, the magnetizing directions of the second middle magnet are inwards arranged along the radial direction, the magnetizing directions of the second side magnets are symmetrically arranged respectively by taking the magnetizing direction of the second middle magnet as two sides of the symmetry axis, the magnetizing directions of the second middle magnets and the magnetizing directions of the second side magnets on the two sides form second included angles b with the same size, and the size of the second included angle b is equal to that of the first included angle a.
In a further technical scheme, the first included angle a and the second included angle b satisfy the condition: the first included angle a is equal to the second included angle b, and 15 degrees < the first included angle a < 75 degrees.
In a further technical scheme, the cross section of the magnet body is in a trapezoid shape, and the radial width of the cross section of the magnet body is gradually increased from inside to outside.
In a further technical scheme, the ratio range of the maximum width of the arc surface of the magnet body to the height thereof is as follows: 1: 8 to 1: 16.
in a further technical scheme, the ratio range of the length of the magnet body to the diameter of the rotor shell is as follows: 1:10 to 1: 20.
In a further technical scheme, the inner side surface of the shell edge is smoothly arranged, a ring-shaped positioning shoulder is formed at the bottom of the shell edge, and each magnet body is respectively abutted and aligned to the ring-shaped positioning shoulder.
In a further technical scheme, a connecting port for connecting an output shaft is formed in the center of the rotor shell, a plurality of connecting screw holes are formed around the edge of the connecting port, and the connecting screw holes are distributed at intervals along the circumferential direction.
In a further technical scheme, the rotor shell is provided with a plurality of hollowed-out openings for reducing weight, and the hollowed-out openings are distributed at intervals along the circumferential direction.
In a further technical scheme, each magnet body is arranged side by side along the circumferential direction and forms a rotor magnet assembly, and the outer surface of the rotor magnet assembly is coated with a graphene coating.
After adopting the structure, compared with the prior art, the utility model has the advantages that: the first magnet assemblies and the second magnet assemblies which are alternately arranged are combined to form a magnetic pole structure, so that the consistency of the magnetic poles of the permanent magnet of the whole motor is improved, and the thrust fluctuation, the torque fluctuation and the noise of the motor in the operation process are reduced; the graphene coating is coated on the outer surface of the magnetic pole structure, so that demagnetization caused by the decrease of the coercive force of the magnet due to high temperature generated in the running process of the motor is avoided, and the service lives of the magnet and the motor are prolonged.
Drawings
The utility model is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is an exploded schematic view of the present invention.
Fig. 3 is a schematic structural view of the rotor magnet assembly of the present invention.
Detailed Description
The following are merely preferred embodiments of the present invention, and do not limit the scope of the present invention.
A rotor magnet assembly is shown in figures 1 to 3 and comprises a rotor shell 1, wherein a shell edge 12 vertical to the rotor shell 1 is formed on the circumferential part of the rotor shell 1, a plurality of magnet bodies are attached to the inner side surface of the shell edge 12, the magnet bodies are respectively arranged side by side along the circumferential direction in an array mode, and two adjacent magnet bodies are mutually attached and matched; the magnet assembly is formed by combining three adjacent magnet bodies, the magnetizing directions of the two adjacent magnet assemblies are oppositely arranged inside and outside, the magnet assembly arranged outwards in the magnetizing direction is a first magnet assembly 21, the magnet assembly arranged inwards in the magnetizing direction is a second magnet assembly 22, and the first magnet assembly 21 and the second magnet assembly 22 are alternately arranged in an array along the circumferential direction. The first magnet assemblies and the second magnet assemblies which are alternately arranged are combined to form a magnetic pole structure, so that the consistency of the magnetic poles of the permanent magnet of the whole motor is improved, and the thrust fluctuation, the torque fluctuation and the noise of the motor in the running process are reduced.
Specifically, the first magnet assembly 21 includes a first middle magnet 21a with magnetizing directions respectively arranged outwards and two first side magnets 21b respectively located at two sides of the first middle magnet 21a, the magnetizing directions of the first middle magnet 21a are arranged outwards along a radial direction, the magnetizing directions of the first side magnets 21b with the magnetizing direction of the first middle magnet 21a as a symmetry axis are respectively arranged symmetrically, and the magnetizing directions of the first middle magnet 21a and the magnetizing directions of the first side magnets 21b at two sides form a first included angle a with the same size; the second magnet assembly 22 includes a second middle magnet 22a and two second side magnets 22b, wherein the magnetization directions of the second middle magnet 22a are respectively inward arranged, the two second side magnets 22b are respectively located at two sides of the second middle magnet 22a, the magnetization directions of the second middle magnet 22a are radially inward arranged, the magnetization directions of the second side magnets 22b which are arranged at two sides of the symmetry axis are respectively symmetrically arranged, the magnetization directions of the second middle magnet 22a respectively form a second included angle b with the same size with the magnetization directions of the second side magnets 22b at two sides, and the size of the second included angle b is equal to that of the first included angle a.
Specifically, the first included angle a and the second included angle b satisfy the condition: the first included angle a is equal to the second included angle b, and 15 degrees < the first included angle a < 75 degrees.
Specifically, the cross section of the magnet body is in a trapezoidal arrangement, and the radial width of the cross section of the magnet body is gradually increased from inside to outside.
Specifically, the ratio range of the maximum width of the arc surface of the magnet to the height thereof is as follows: 1: 8 to 1: 16.
specifically, the ratio of the length of the magnet body to the diameter of the rotor case 1 ranges from: 1:10 to 1: 20.
Specifically, the inner side surface of the shell edge 12 is smoothly arranged, the bottom of the shell edge 12 is formed with an annular positioning shoulder 11, and each magnet body respectively abuts against and aligns with the annular positioning shoulder 11.
Specifically, a connection port 10 for connecting an output shaft is formed at a central position of the rotor housing 1, a plurality of connection screw holes 14 are formed around a side portion of the connection port 10, and the connection screw holes 14 are circumferentially spaced apart from each other.
Specifically, the rotor housing 1 is provided with a plurality of hollow openings 13 for reducing weight, and the hollow openings 13 are respectively distributed at intervals along the circumferential direction.
Specifically, each magnet body is arranged side by side along the circumferential direction and forms rotor magnet assembly 2, and the outer surface coating of rotor magnet assembly 2 has a graphite alkene coating. The graphene coating is coated on the outer surface of the magnetic pole structure, so that demagnetization caused by the decrease of the coercive force of the magnet due to high temperature generated in the running process of the motor is avoided, and the service lives of the magnet and the motor are prolonged.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. A rotor magnet assembly, comprising: the rotor comprises a rotor shell (1), wherein a shell edge (12) vertical to the rotor shell (1) is formed on the circumferential part of the rotor shell (1), a plurality of magnet bodies are attached to the inner side surface of the shell edge (12), the magnet bodies are arranged side by side in an array along the circumferential direction, and two adjacent magnet bodies are mutually attached and matched; the magnet assembly is formed by combining three adjacent magnet bodies, the magnetizing directions of the two adjacent magnet assemblies are oppositely arranged inside and outside, the magnet assembly arranged outwards in the magnetizing direction is a first magnet assembly (21), the magnet assembly arranged inwards in the magnetizing direction is a second magnet assembly (22), and the first magnet assembly (21) and the second magnet assembly (22) are alternately arranged in an array mode in the circumferential direction.
2. A rotor magnet assembly according to claim 1, wherein: the first magnet assembly (21) comprises a first middle magnet (21a) and two first side magnets (21b), wherein the magnetizing directions of the first middle magnet (21a) are outwards arranged respectively, the two first side magnets (21b) are respectively positioned at two sides of the first middle magnet (21a), the magnetizing directions of the first middle magnet (21a) are outwards arranged along the radial direction, the magnetizing directions of the first side magnets (21b) which are at two sides and take the magnetizing direction of the first middle magnet (21a) as a symmetry axis are respectively symmetrically arranged, the magnetizing direction of the first middle magnet (21a) and the magnetizing directions of the first side magnets (21b) at two sides respectively form a first included angle a with the same size,
the second magnet assembly (22) comprises a second middle magnet (22a) and two second side magnets (22b), wherein the magnetizing directions of the second middle magnet (22a) are inwards arranged respectively, the two second side magnets (22b) are located on two sides of the second middle magnet (22a) respectively, the magnetizing directions of the second middle magnet (22a) are inwards arranged along the radial direction, the magnetizing directions of the second side magnets (22b) taking the magnetizing direction of the second middle magnet (22a) as the symmetric axis are symmetrically arranged respectively, the magnetizing directions of the second middle magnet (22a) and the magnetizing directions of the second side magnets (22b) on two sides form a second included angle b with the same size, and the size of the second included angle b is equal to that of the first included angle a.
3. A rotor magnet assembly according to claim 2, wherein: the first included angle a and the second included angle b meet the condition that: the first included angle a is equal to the second included angle b, and 15 degrees < the first included angle a < 75 degrees.
4. A rotor magnet assembly according to claim 3, wherein: the cross section of the magnet body is in a trapezoidal arrangement, and the radial width of the cross section of the magnet body is gradually increased from inside to outside.
5. A rotor magnet assembly according to claim 4, wherein: the ratio range of the maximum width of the arc surface of the magnet body to the height thereof is as follows: 1: 8 to 1: 16.
6. a rotor magnet assembly according to claim 5, wherein: the ratio range of the length of the magnet body to the diameter of the rotor shell (1) is as follows: 1:10 to 1: 20.
7. A rotor magnet assembly according to any one of claims 1 to 6, wherein: the inner side surface of the shell edge (12) is arranged smoothly, a ring-shaped positioning shoulder (11) is formed at the bottom of the shell edge (12), and each magnet body is respectively abutted and aligned to the ring-shaped positioning shoulder (11).
8. A rotor magnet assembly according to claim 7, wherein: a connecting port (10) used for connecting an output shaft is formed in the center of the rotor shell (1), a plurality of connecting screw holes (14) are formed in the edge portion of the connecting port (10) in a surrounding mode, and the connecting screw holes (14) are distributed at intervals in the circumferential direction.
9. A rotor magnet assembly according to claim 8, wherein: the rotor shell (1) is provided with a plurality of hollowed-out openings (13) used for reducing weight, and the hollowed-out openings (13) are distributed at intervals along the circumferential direction.
10. A rotor magnet assembly according to claim 1, wherein: each magnet body is arranged side by side along the circumferencial direction permutation and forms rotor magnet assembly (2), and the outer surface coating of rotor magnet assembly (2) has a graphite alkene coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122020758.XU CN216216150U (en) | 2021-08-25 | 2021-08-25 | Rotor magnet assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122020758.XU CN216216150U (en) | 2021-08-25 | 2021-08-25 | Rotor magnet assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216216150U true CN216216150U (en) | 2022-04-05 |
Family
ID=80914900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122020758.XU Active CN216216150U (en) | 2021-08-25 | 2021-08-25 | Rotor magnet assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216216150U (en) |
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2021
- 2021-08-25 CN CN202122020758.XU patent/CN216216150U/en active Active
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