Motor secondary assembly and linear motor

Abstract

The invention provides a motor secondary assembly and a linear motor, the motor secondary assembly comprises a permanent magnet fixing plate and a permanent magnet assembly, and the permanent magnet fixing plate is provided with a permanent magnet mounting surface; the permanent magnet assembly comprises a first magnetic section and a second magnetic section, and the first magnetic section is provided with a first matching surface; the second magnetic section is arranged at the end part of at least one end of the first magnetic section in the first direction, the second magnetic section is arranged close to the first end of the permanent magnet fixing plate in the first direction, and the second magnetic section is provided with a second matching surface; and in the second direction, the distance between at least one part of the first matching surface and the permanent magnet mounting surface is L1, the distance between the second matching surface and the permanent magnet mounting surface is L2, and L1 is greater than L2. According to the motor secondary assembly provided by the invention, the size of the end part of the motor secondary assembly is reduced, so that the distortion of an air-gap magnetic field is weakened, the end part effect force generated by non-uniform magnetic field distribution can be effectively reduced, and the thrust fluctuation of the motor in the operation process is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of linear motors, and more specifically, to a motor secondary component and a linear motor. Background Art

[0002] Linear motors mainly include permanent magnet synchronous linear motors and induction asynchronous linear motors. The structure of permanent magnet synchronous linear motors is mostly short primary components and long secondary components. The primary components are mostly iron core tooth structure, and the secondary components are mostly strong magnetic magnet materials. Through the interaction of the magnetic field between the primary and secondary components, electromagnetic force is generated to drive the mover to move linearly. Existing permanent magnet synchronous motors mostly use Halbach arrangement magnets, including axially magnetized magnets and radially magnetized magnets. Axially magnetized magnets are significantly demagnetized due to high temperature, resulting in excessive thrust fluctuations, affecting the working performance of the motor. Summary of the invention

[0003] One purpose of the present application is to provide a new technical solution for a motor secondary assembly, which can at least solve the problem of large motor thrust fluctuation in the prior art.

[0004] Another object of the present application is to provide a linear motor, comprising the above-mentioned motor secondary assembly.

[0005] In a first aspect, the present application provides a motor secondary component, comprising a permanent magnet fixing plate, the permanent magnet fixing plate having a permanent magnet mounting surface; a permanent magnet component, the permanent magnet component being arranged on the permanent magnet mounting surface, the permanent magnet component comprising: a first magnetic segment, the first magnetic segment being arranged along the first direction, the first magnetic segment having a first mating surface, the first mating surface being arranged on a side away from the permanent magnet mounting surface; a second magnetic segment, the second magnetic segment being arranged along the first direction, and the second magnetic segment being arranged at an end of at least one end of the first magnetic segment in the first direction, the second magnetic segment being arranged close to the first end of the permanent magnet fixing plate in the first direction, the second magnetic segment having a second mating surface, the second mating surface being arranged on a side away from the permanent magnet mounting surface; in the second direction, the distance between the first mating surface and the permanent magnet mounting surface is L1, the distance between the second mating surface and the permanent magnet mounting surface is L2, and L1 is greater than L2; wherein, the second direction is perpendicular to the first direction, and the second direction is perpendicular to the permanent magnet mounting surface.

[0006] Optionally, the permanent magnet assembly also includes a third magnetic segment, which is arranged along the first direction, and the third magnetic segment and the second magnetic segment are respectively located at the two ends of the first magnetic segment in the first direction, and the third magnetic segment is arranged close to the second end of the permanent magnet fixing plate in the first direction, and the third magnetic segment has a third mating surface, and the third mating surface is arranged on the side away from the permanent magnet mounting surface, and in the second direction, the distance between the third mating surface and the permanent magnet mounting surface is S1, and L1 is greater than S1.

[0007] Optionally, the second magnetic segment has the same structure as the third magnetic segment.

[0008] Optionally, a size of the second magnetic segment in the first direction is H1, a sum of sizes of the first magnetic segment and the second magnetic segment in the first direction is L, and a range of H1 is: 1 / 16L≤H1≤1 / 3L.

[0009] Optionally, the first magnetic segment includes a plurality of first permanent magnets and a plurality of second permanent magnets, and the plurality of first permanent magnets and the plurality of second permanent magnets are alternately arranged on the permanent magnet mounting surface along the first direction, and the magnetizing direction of each first permanent magnet is respectively parallel to the second direction, and the magnetizing direction of each second permanent magnet is respectively parallel to the first direction; wherein, the first permanent magnet has the first mating surface, and the second permanent magnet has a fourth mating surface, and the fourth mating surface is arranged on a side away from the permanent magnet mounting surface, and in the second direction, the distance between the fourth mating surface and the permanent magnet mounting surface is L3, and L1 is greater than L3.

[0010] Optionally, L2=L3.

[0011] Optionally, a relationship between L3 and L1 satisfies 1 / 2L1≤L3≤7 / 8L1.

[0012] Optionally, a size of the first permanent magnet in the first direction is larger than a size of the second permanent magnet in the first direction.

[0013] Optionally, the permanent magnet brand of the second permanent magnet is greater than the permanent magnet brand of the first permanent magnet.

[0014] Optionally, the maximum magnetic product energy of the second permanent magnet is greater than the maximum magnetic product energy of the first permanent magnet.

[0015] Optionally, adjacent first permanent magnets and second permanent magnets cooperate to form a pole pair, and four adjacent pole pairs constitute a unit permanent magnet. In the first direction, the size of the unit permanent magnet is H, and the sum of the sizes of the first magnetic segment and the second magnetic segment in the first direction is L. The range of H is: L / H=n, where n is a positive integer.

[0016] Optionally, n≥6.

[0017] Optionally, the second magnetic segment includes a plurality of third permanent magnets and a plurality of fourth permanent magnets, and the plurality of third permanent magnets and the plurality of fourth permanent magnets are alternately arranged on the permanent magnet mounting surface along the first direction, and the third permanent magnet and the fourth permanent magnet respectively have the second mating surface, and in the second direction, the size of the third permanent magnet is the same as the size of the fourth permanent magnet.

[0018] Optionally, the first magnetic segment and the second magnetic segment respectively include a plurality of magnetic steels arranged along a first direction, and the magnetic steels of the first magnetic segment and the second magnetic segment are arranged in a Halbach manner.

[0019] Optionally, the permanent magnet fixing plate is an annular plate.

[0020] Optionally, the permanent magnet fixing plate is a circular ring-shaped plate, the permanent magnet mounting surface is the inner wall surface of the circular ring-shaped plate, the first direction is parallel to the axial direction of the circular ring-shaped plate, and the second direction is the radial direction of the circular ring-shaped plate.

[0021] Optionally, the first magnetic segment and the second magnetic segment are respectively formed into annular structures, the first connecting surface is an annular surface coaxial with the first magnetic segment, and the second connecting surface is an annular surface coaxial with the second magnetic segment.

[0022] In a second aspect, the present application provides a linear motor, which includes the motor secondary component described in any one of the above embodiments.

[0023] Optionally, the linear motor also includes a motor primary component, the motor primary component includes an iron core and a winding, and the winding is arranged on the iron core; the permanent magnet fixing plate is a circular ring plate, the permanent magnet mounting surface is the inner wall surface of the circular ring plate, and the motor secondary component is sleeved on the motor primary component.

[0024] Optionally, in the second direction, a distance between the second mating surface and an outer wall surface of the iron core is H2, and a range of H2 is: 1 / 7L2≤H2≤L2.

[0025] According to the motor secondary component of the present application, the permanent magnet component is divided into a first magnetic segment and a second magnetic segment, the second magnetic segment is arranged at the end of the first magnetic segment, and the distance between the second magnetic segment and the permanent magnet mounting surface is smaller than the distance between the first magnetic segment and the permanent magnet mounting surface, thereby reducing the size of the second magnetic segment in the second direction, thereby reducing the distortion of the air gap magnetic field, and can effectively reduce the end effect force caused by uneven magnetic field distribution, reduce the thrust fluctuation of the motor during operation, and effectively improve the operating stability and operating effect of the motor.

[0026] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0028] Figure 1 is a cross-sectional view of a motor secondary component and a motor primary component according to an embodiment of the present application;

[0029] Figure 2 yes Figure 1 An enlarged view of the circled portion at A in the middle;

[0030] Figure 3 is a cross-sectional view of a first magnetic segment and a second magnetic segment in a motor secondary assembly according to an embodiment of the present application;

[0031] Figure 4 is a schematic diagram of a first permanent magnet in a secondary component of a motor according to yet another embodiment of the present application.

[0032] Reference numerals:

[0033] Motor secondary assembly 100;

[0034] First magnetic segment 10; first permanent magnet 11; second permanent magnet 12; fourth mating surface 121; first connecting surface 13; first mating surface 14;

[0035] The second magnetic segment 20; the third permanent magnet 21; the fourth permanent magnet 22; the second connecting surface 23; the second matching surface 24;

[0036] Permanent magnet fixing plate 30; Permanent magnet mounting surface 31;

[0037] A third magnetic segment 40; a third connecting surface 41; a third mating surface 42;

[0038] Motor secondary component 200 ; iron core 201 ; winding 202 . DETAILED DESCRIPTION

[0039] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0040] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0041] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0042] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0043] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0044] The following first describes in detail the motor secondary assembly 100 according to an embodiment of the present application with reference to the drawings.

[0045] like Figures 1 to 4 As shown, the motor secondary assembly 100 according to the embodiment of the present application includes a permanent magnet fixing plate 30 and a permanent magnet assembly.

[0046] Specifically, the permanent magnet fixing plate 30 has a permanent magnet mounting surface 31, and the permanent magnet assembly is arranged on the permanent magnet mounting surface 31. The permanent magnet assembly includes a first magnetic segment 10 and a second magnetic segment 20. The first magnetic segment 10 is arranged along the first direction, and the first magnetic segment 10 has a first mating surface 14, and the first mating surface 14 is arranged on a side away from the permanent magnet mounting surface 31. The second magnetic segment 20 is arranged along the first direction, and the second magnetic segment 20 is arranged at the end of at least one end of the first magnetic segment 10 in the first direction, and the second magnetic segment 20 is arranged near the first end of the permanent magnet fixing plate 30 in the first direction, and the second magnetic segment 20 has a second mating surface 24, and the second mating surface 24 is arranged on a side away from the permanent magnet mounting surface 31. In the second direction, at least a portion of the first mating surface 14 is at a distance L1 from the permanent magnet mounting surface 31, and the second mating surface 24 is at a distance L2 from the permanent magnet mounting surface 31, where L1 is greater than L2; wherein the second direction is perpendicular to the first direction, and the second direction is perpendicular to the permanent magnet mounting surface 31. When the motor secondary assembly is used for a linear motor, the first direction is the moving direction of the linear motor.

[0047] In other words, the motor secondary component 100 according to the embodiment of the present application is mainly composed of a permanent magnet fixing plate 30 and a permanent magnet assembly. Among them, the end surface of the permanent magnet fixing plate 30 close to the first magnetic segment 10 and the second magnetic segment 20 is a permanent magnet mounting surface 31, and the permanent magnet mounting surface 31 extends along the first direction. Specifically, the permanent magnet mounting surface 31 is the inner wall surface of the permanent magnet fixing plate 30, and the permanent magnet mounting surface 31 can be used to install the permanent magnet assembly. The permanent magnet assembly and the permanent magnet fixing plate 30 cooperate to form the motor secondary component 100, thereby playing a magnetizing role, and the permanent magnet assembly can be composed of the first magnetic segment 10 and the second magnetic segment 20.

[0048] The first magnetic segment 10 is arranged along the first direction on the permanent magnet mounting surface 31, and the first magnetic segment 10 has a first mating surface 14. The second magnetic segment 20 is arranged along the first direction on the permanent magnet mounting surface 31, and the second magnetic segment 20 is arranged at the end of at least one end of the first magnetic segment 10 in the first direction, and the second magnetic segment 20 is close to the first end of the permanent magnet fixing plate 30 in the first direction. Optionally, in the first direction, the second magnetic segment 20 can be installed at the end of any end of the first magnetic segment 10, and the second magnetic segment 20 can also be installed at the ends of both ends of the first magnetic segment 10, that is, in the motor secondary assembly 100 composed of the first magnetic segment 10 and the second magnetic segment 20, the second magnetic segment 20 serves as the end of at least one end of the motor secondary assembly 100.

[0049] Optionally, the first magnetic segment 10 also includes a first connecting surface 13, the first mating surface 14 and the first connecting surface 13 are arranged opposite to each other in the second direction, the first connecting surface 13 is connected to the permanent magnet mounting surface 31, and the first magnetic segment 10 can be installed on the permanent magnet mounting surface 31 through the first connecting surface 13.

[0050] In addition, the second magnetic segment 10 also has a second mating surface 24. In the second direction, the distance between the first mating surface 14 and the permanent magnet mounting surface 31 is L1, that is, the size of at least a portion of the first magnetic segment 10 in the second direction is L1; the distance between the second mating surface 24 and the permanent magnet mounting surface 31 is L2, that is, the size of the second magnetic segment 20 in the second direction is L2, and L1 is greater than L2. Therefore, in the second direction, the size of the second magnetic segment 20 is smaller than the size of at least a portion of the first magnetic segment 10. The first direction is perpendicular to the second direction, and the second direction is perpendicular to the permanent magnet mounting surface 31, which determines the extension direction of the first direction and the second direction.

[0051] Optionally, the second magnetic segment 10 further includes a second mating surface 24 . The second connecting surface 23 and the second mating surface 24 can be symmetrically arranged in the second direction. The second connecting surface 23 is connected to the permanent magnet mounting surface 31 . The second magnetic segment 20 can be mounted on the permanent magnet mounting surface 31 through the second connecting surface 23 .

[0052] Therefore, according to the motor secondary component 100 of the present application, the permanent magnet component is divided into a first magnetic segment 10 and a second magnetic segment 20, and the second magnetic segment 20 is installed at the end of the first magnetic segment 10 in the first direction; at the same time, in the second direction, the size of the second magnetic segment 20 is made smaller than the size of the first magnetic segment 10, that is, in the motor secondary component 100 composed of the first magnetic segment 10 and the second magnetic segment 20, the thickness of the end of the motor secondary component 100 in the second direction can be cut, that is, the size of the end of the motor secondary component 100 in the second direction is reduced, which can reduce the traveling wave magnetic field between the second magnetic segment 20 and other parts of the motor, weaken the air gap magnetic field distortion, reduce leakage magnetic phenomenon, effectively reduce the thrust fluctuation during the operation of the motor, and then effectively reduce the motor end effect and thrust fluctuation, and improve the operation effect and stability of the linear motor.

[0053] According to one embodiment of the present application, the permanent magnet assembly also includes a third magnetic segment 40, which is arranged along the first direction, and the third magnetic segment 40 and the second magnetic segment 20 are respectively located at the two ends of the first magnetic segment 10 in the first direction, and the third magnetic segment 40 is arranged near the second end of the permanent magnet fixing plate 30 in the first direction, and the third magnetic segment 40 has a third mating surface 42. The third magnetic segment 40 is arranged on a side away from the permanent magnet mounting surface 31, and in the second direction, the distance between the third mating surface 42 and the permanent magnet mounting surface 31 is S1, and L1 is greater than S1.

[0054] In other words, the permanent magnet assembly also includes a third magnetic segment 40 arranged along the first direction, and the second magnetic segment 20 and the third magnetic segment 40 are respectively installed at the two ends of the first magnetic segment 10, and at the same time L2 and S1 are both smaller than L1, that is, in the second direction, the size of the first magnetic segment 10 is larger than the size of the second magnetic segment 20 and the size of the third magnetic segment 40. Therefore, in the permanent magnet assembly composed of the first magnetic segment 10, the second magnetic segment 20 and the third magnetic segment 40, the sizes of the two ends of the permanent magnet assembly are smaller than the size of the middle part of the permanent magnet, thereby weakening the magnetic field fluctuations at both ends of the permanent magnet assembly.

[0055] The third magnetic segment 40 also includes a third connecting surface 41 . The third connecting surface 41 is connected to the permanent magnet mounting surface 31 . The third magnetic segment 40 can be mounted on the permanent magnet mounting surface 31 through the third connecting surface 41 .

[0056] Therefore, in the second direction, the size of the second magnetic segment 20 and the size of the third magnetic segment 40 are both smaller than the size of the first magnetic segment 10, that is, the size of the two ends of the motor secondary component 100 is smaller than the size of the middle part of the motor secondary component 100, that is, the size of the ends of the motor secondary component 100 is reduced, which can effectively reduce the traveling wave magnetic field at both ends of the motor secondary component 100, further weaken the air gap magnetic field distortion, and reduce the leakage magnetic phenomenon, thereby effectively reducing thrust fluctuations and end effects, and improving the operation stability of the motor.

[0057] According to some specific embodiments of the present application, the second magnetic segment 20 and the third magnetic segment 40 have the same structure.

[0058] Specifically, the second magnetic segment 20 and the third magnetic segment 40 have the same structure and the same dimensions in the first direction and the second direction, ie, S1 = L2, so that the dimensions of both ends of the motor secondary assembly 100 are more regular and more stable.

[0059] In other words, in the second direction, the sizes of the two ends of the motor secondary component 100 are the same and are both smaller than the size of the middle part of the motor secondary component 100, so that the ends of the motor secondary component 100 have a uniform size, so that the traveling wave magnetic field at both ends of the motor secondary component 100 can be equally reduced, further weakening the air gap magnetic field distortion in the linear motor and reducing the leakage magnetic phenomenon, thereby effectively reducing thrust fluctuations and end effects, and improving the motor operation stability.

[0060] According to some other embodiments of the present application, the size of the second magnetic segment 20 in the first direction is H1, the sum of the sizes of the first magnetic segment 10 and the second magnetic segment 20 in the first direction is L, and the range of H1 is: 1 / 16L≤H1≤1 / 3L.

[0061] Specifically, in the first direction, the size of the second magnetic segment 20 is H1, and the total size of the first magnetic segment 10 and the second magnetic segment 20 is L. Optionally, L can be the total size of a first magnetic segment 10 and a second magnetic segment 20; L can also be the total size of a first magnetic segment 10 and a plurality of second magnetic segments 20. The relationship between H1 and L satisfies 1 / 16L≤H1≤1 / 3L, that is, the relationship between H1 and L can be H1=1 / 16L; the relationship between H1 and L can also be H1=1 / 10L; the relationship between H1 and L can also be H1=1 / 3L, which can be adjusted according to the actual needs of the linear motor.

[0062] Thus, the length of the second magnetic segment 20 is optimized, and the appropriate length can effectively reduce the traveling wave magnetic field at the end of the motor secondary assembly 100, thereby reducing the air gap magnetic field distortion and the occurrence of magnetic leakage, and ensuring that the motor secondary assembly 100 has a large thrust while having a small thrust fluctuation. If the length of the second magnetic segment 20 is too long, it is easy to cause the thrust of the motor secondary assembly 100 to become smaller, resulting in a poor working effect of the motor. If the length of the second magnetic segment 20 is too short, the effect of weakening the traveling wave magnetic field at the end of the motor secondary assembly 100 is not good, that is, the motor secondary assembly 100 still has a large end effect, which is easy to produce thrust fluctuations, resulting in poor stability in the use of the linear motor.

[0063] In some specific embodiments of the present application, the first magnetic segment 10 includes a plurality of first permanent magnets 11 and a plurality of second permanent magnets 12, and the plurality of first permanent magnets 11 and the plurality of second permanent magnets 12 are alternately arranged on the permanent magnet mounting surface 31 along the first direction, and the magnetization direction of each first permanent magnet 10 is parallel to the second direction, and the magnetization direction of each second permanent magnet 20 is parallel to the first direction. Among them, the first permanent magnet 11 and the second permanent magnet 12 respectively have a first connecting surface 13, the first permanent magnet 11 has a first matching surface 14, and the second permanent magnet 12 has a fourth matching surface 121 arranged opposite to the first connecting surface 13 along the second direction. In the second direction, the distance between the fourth matching surface 121 and the permanent magnet mounting surface 31 is L3, and L1 is greater than L3.

[0064] In other words, the first magnetic segment 10 is mainly composed of a plurality of first permanent magnets 11 and a plurality of second permanent magnets 12, and the plurality of first permanent magnets 11 and the plurality of second permanent magnets 12 can be alternately installed on the permanent magnet installation surface 31 along the first direction. There are many ways to arrange the first permanent magnets and the second permanent magnets, for example, the first permanent magnets 11 and the second permanent magnets 12 can be alternately arranged one by one along the first direction; the plurality of first permanent magnets 11 and the plurality of second permanent magnets 12 can be arranged alternately along the first direction; two first permanent magnets 11 form a group, two second permanent magnets 12 form a group, a group of first permanent magnets 11 and a group of second permanent magnets 12 are alternately arranged, etc.

[0065] The first permanent magnet 11 and the second permanent magnet 12 respectively have a first connection surface 13, and the end surface of the first permanent magnet 11 and the second permanent magnet 12 close to the permanent magnet mounting surface 31 is the first connection surface 13. The end surface of the first permanent magnet 11 away from the permanent magnet mounting surface 31 and corresponding to the first connection surface 13 is the first matching surface 14, and the end surface of the second permanent magnet 12 away from the permanent magnet mounting surface 31 and corresponding to its first connection surface 13 is the fourth matching surface 121, and the distance of the fourth matching surface 121 from the permanent magnet mounting surface 31 in the second direction is L3, and L1 is greater than L3. That is to say, in the second direction, the size of the first permanent magnet 11 is greater than the size of the second permanent magnet 12. In the first magnetic section 10, the first permanent magnet 11 and the second permanent magnet 12 can form a wave-like alternating structure, and can also reduce the thrust fluctuation in the linear motor to improve the stability of the linear motor.

[0066] Since the magnetization direction of the first permanent magnet 11 is parallel to the second direction, it mainly provides the main magnetic field in the motor secondary component 100, and the magnetization direction of the second permanent magnet 12 is parallel to the first direction, it mainly provides the magnetic path in the motor secondary component 100; therefore, the size of the second permanent magnet 12 in the second direction is smaller than the size of the first permanent magnet 11 in the second direction. Compared with the size of the second permanent magnet in the second direction being equal to the size of the first permanent magnet 11 in the second direction, the size of the second permanent magnet 12 in the second direction is reduced, and it is not easy to affect the magnetic field in the motor secondary component 100, while ensuring the maximum thrust output of the linear motor, the thrust fluctuation in the linear motor is effectively reduced, and the running stability of the motor is improved. In addition, reducing the size of the second permanent magnet 12 in the second direction can also effectively reduce the risk of demagnetization of the second permanent magnet 12 at high temperature, so that at a higher operating temperature, the linear motor can maintain high thrust and high efficiency operation.

[0067] Therefore, the first permanent magnet 11 and the second permanent magnet 12 in the first magnetic segment 10 can form a wavy alternating structure, which can effectively reduce thrust fluctuations compared to the first permanent magnet 11 and the second permanent magnet 12 having the same size in the first magnetic segment 10, and can maintain the thrust output of the linear motor, that is, the motor operation stability and operation effect can be guaranteed.

[0068] According to some optional embodiments of the present application, L2=L3.

[0069] Specifically, the size of the second permanent magnet 12 in the second direction is the same as the size of the second magnetic segment 20 in the second direction. That is to say, the second permanent magnet 12 can obtain the same or similar effect of reducing the air gap magnetic field in the motor secondary assembly 100 as the second magnetic segment 20, thereby weakening the distortion of the air gap magnetic field, thereby reducing the leakage magnetic field phenomenon, further reducing the thrust fluctuation during the operation of the linear motor, effectively reducing the end effect and thrust fluctuation of the motor secondary assembly 100, and improving the operation effect and operation stability of the linear motor.

[0070] According to some optional embodiments of the present application, the relationship between L3 and L1 satisfies 1 / 2L1≤L3≤7 / 8L1.

[0071] Specifically, the size of the second permanent magnet 12 in the second direction and the size of the first permanent magnet 11 in the second direction satisfy 1 / 2L1≤L3≤7 / 8L1. In the second direction, optionally, the size of the first permanent magnet 11 and the size of the second permanent magnet 12 can satisfy L3=1 / 2L1; the size of the first permanent magnet 11 and the size of the second permanent magnet 12 can also satisfy L3=5 / 8L1; the size of the first permanent magnet 11 and the size of the second permanent magnet 12 can also satisfy L3=7 / 8L1.

[0072] Thus, the size of the second permanent magnet 12 in the second direction is optimized, and the appropriate size can reduce the traveling magnetic field and thrust fluctuation formed by the second permanent magnet 12, and can also maintain an appropriate thrust size, so that the motor can maintain a better operating effect. If the size of the second permanent magnet 12 is too small, it will have a greater impact on the magnetic field and thrust size of the linear motor, and the operating effect of the motor will be poor. If the size of the second permanent magnet 12 is too large, there will be no significant improvement on the thrust fluctuation in the linear motor, that is, the motor will still be affected by the thrust fluctuation during operation.

[0073] According to one embodiment of the present application, a size of the first permanent magnet 11 in the first direction is smaller than a size of the second permanent magnet 12 in the first direction.

[0074] Specifically, in the first direction, the size of the first permanent magnet 11 is larger than the size of the second permanent magnet 12, which further optimizes the size of the second permanent magnet 12 in the second direction, not only reducing the size of the second permanent magnet 12 in the second direction, but also increasing the size of the second permanent magnet 12 in the first direction. In other words, while fully reducing the traveling wave magnetic field and thrust fluctuation formed by the second permanent magnet 12, the thrust output of the second permanent magnet 12 is guaranteed, and the operation stability of the linear motor is improved.

[0075] According to some embodiments of the present application, the permanent magnet grade of the second permanent magnet 12 is greater than the permanent magnet grade of the first permanent magnet 11 .

[0076] Specifically, the permanent magnet grade of the second permanent magnet 12 can be N48 or N45, and the permanent magnet grade of the first permanent magnet 11 can be N42 or N40, which can be selected according to actual needs. Since the size of the second permanent magnet 12 is smaller than the size of the first permanent magnet 11 in the second direction and the first direction, a material with a larger permanent magnet grade is selected to make the second permanent magnet 12, and the remanence and coercive force of the second permanent magnet 12 are enhanced, which can greatly reduce the occurrence of demagnetization of the second permanent magnet 12 at high temperature. At the same time, while reducing the amount of magnetic steel used in the second permanent magnet 12, the thrust of the motor secondary component 100 is maintained. In other words, the permanent magnet grade of the second permanent magnet 12 is greater than the grade of the first permanent magnet 11, which can make the magnetic force of the first permanent magnet 11 and the second permanent magnet 12 similar, and maintain the thrust output of the linear motor.

[0077] In some specific embodiments of the present application, the maximum magnetic product energy of the second permanent magnet 12 is greater than the maximum magnetic product energy of the first permanent magnet 11 .

[0078] In detail, when the permanent magnet brand of the second permanent magnet 12 is N48, the maximum magnetic product energy of the second permanent magnet 12 is in the range of 46-48 MGOe, and when the permanent magnet brand of the first permanent magnet 11 is N42, the maximum magnetic product energy of the first permanent magnet 11 is in the range of 40-42 MGOe; or, when the permanent magnet brand of the second permanent magnet 12 is N45, the maximum magnetic product energy of the second permanent magnet 12 is in the range of 42-45 MGOe, and when the permanent magnet brand of the first permanent magnet 11 is N40, the maximum magnetic product energy of the first permanent magnet 11 is in the range of 38-40 MGOe. The second permanent magnet 12 is made of a magnetic steel material with a large magnetic product energy. Since the size of the second permanent magnet 12 is smaller than that of the first permanent magnet 11 in the second direction and the first direction, the magnetic product energy of the second permanent magnet 12 is increased to compensate for the thrust loss of the second permanent magnet 12 caused by the reduction in size, thereby improving the thrust output of the second permanent magnet 12 and allowing the linear motor to maintain a high thrust and high efficiency.

[0079] According to some optional embodiments of the present application, adjacent first permanent magnets 11 and second permanent magnets 12 cooperate to form a pole pair, and four adjacent pole pairs constitute a unit permanent magnet. In the first direction, the size of the unit permanent magnet is H, and the sum of the sizes of the first magnetic segment 10 and the second magnetic segment 20 in the first direction is L. The range of H is: L / H=n, where n is a positive integer.

[0080] Specifically, the magnetization directions of the adjacent first permanent magnets 11 and the second permanent magnets 12 are perpendicular to each other, so the adjacent first permanent magnets 11 and the second permanent magnets 12 can form a pole pair with different magnetization directions, and four adjacent pole pairs can form a unit permanent magnet. The magnetization directions of the multiple first permanent magnets 11 and the multiple second permanent magnets 12 in a unit permanent magnet are parallel to the second direction and away from the permanent magnet mounting surface 31, parallel to the first direction and toward Figure 2 The left side of the permanent magnet mounting surface 31 is parallel to the second direction and is toward the permanent magnet mounting surface 31, and the left side of the permanent magnet mounting surface 31 is parallel to the first direction and is toward the permanent magnet mounting surface 31. Figure 2 The thrust of the unit permanent magnet is more suitable. By forming the motor secondary assembly 100 with multiple unit permanent magnets, it is convenient to form a suitable motor secondary assembly 100 according to the use needs, so that the linear motor can obtain a large thrust and high-efficiency operation effect.

[0081] According to one embodiment of the present application, n≥6.

[0082] Specifically, the number of unit permanent magnets in the motor secondary assembly 100 is greater than or equal to six. Optionally, the number of unit permanent magnets in the motor secondary assembly 100 can be six, eight, or ten, which can be adjusted according to the actual needs of the motor. In other words, the motor secondary assembly 100 has more than six unit permanent magnets, which can obtain a relatively excellent and stable thrust size, that is, the linear motor has a large thrust and high efficiency operation effect.

[0083] According to some embodiments of the present application, the second magnetic segment 20 includes a plurality of third permanent magnets 21 and a plurality of fourth permanent magnets 22, and the plurality of third permanent magnets 21 and the plurality of fourth permanent magnets 22 are alternately arranged on the permanent magnet mounting surface 31 along the first direction, and the third permanent magnets 21 and the fourth permanent magnets 22 respectively have a second connecting surface 23 and a second mating surface 24, and in the second direction, the size of the third permanent magnet 41 is the same as the size of the fourth permanent magnet 42.

[0084] In other words, the second magnetic segment 20 is composed of a plurality of third permanent magnets 21 and a plurality of fourth permanent magnets 22, and the plurality of third permanent magnets 21 and the plurality of fourth permanent magnets 22 are arranged alternately. Optionally, the third permanent magnets 21 and the fourth permanent magnets 22 can be arranged alternately one by one along the first direction; the plurality of third permanent magnets 21 and the plurality of fourth permanent magnets 22 can also be arranged alternately along the first direction; or two third permanent magnets 21 can be a group, two fourth permanent magnets 22 can be a group, a group of third permanent magnets 21 and a group of fourth permanent magnets 22 can be arranged alternately, and the like.

[0085] Among them, the end faces of each third permanent magnet 21 and each fourth permanent magnet 22 close to the permanent magnet mounting surface 31 are both second connecting surfaces 23, and the end faces of each third permanent magnet 21 and each fourth permanent magnet 22 away from the permanent magnet mounting surface 31 and corresponding to the second connecting surface 23 are second mating surfaces 24. In the second direction, the distance between the second mating surface 24 and the second connecting surface 23 is L2, that is, the size of the third permanent magnet 21 in the second direction is the same as the size of the fourth permanent magnet 22 in the second direction.

[0086] In addition, since the third permanent magnet and the fourth permanent magnet have the same size in the second direction, that is, the second magnetic segment as a whole has the same size in the second direction, and since the second magnetic segment is installed at the end of the first magnetic segment, the end shape of the permanent magnet assembly is relatively regular, which is beneficial to reducing thrust fluctuations in the permanent magnet assembly.

[0087] Therefore, by making the third permanent magnet and the fourth permanent magnet have the same size in the second direction, the size of the end of the motor secondary component 100 becomes smaller and the shape is regular, which can reduce the traveling wave magnetic field generated by the third permanent magnet 21 and the fourth permanent magnet 22, weaken the air gap magnetic field distortion, and thus reduce the leakage magnetic phenomenon, ensuring that when the motor is running, the thrust fluctuation change is much smaller than the thrust fluctuation in the linear motor where the motor secondary component 100 with the magnet size at both ends unchanged is located, effectively reducing the end effect force and thrust fluctuation of the linear motor.

[0088] According to some embodiments of the present application, the first magnetic segment 10 and the second magnetic segment 20 respectively include a plurality of magnetic steels arranged along the first direction, and the magnetic steels of the first magnetic segment 10 and the second magnetic segment 20 are arranged in a Halbach manner.

[0089] In other words, since the magnetic steel in the first magnetic segment 10 is arranged in a Halbach manner, that is, in the first magnetic segment 10, the magnetization direction of the first permanent magnet 11 is parallel to the second direction, and the magnetization direction of the second permanent magnet 12 is parallel to the first direction; and the magnetization directions of the two adjacent first permanent magnets 11 are opposite, and the magnetization directions of the two adjacent second permanent magnets 12 are opposite, thus forming the first magnetic segment 10 with a Halbach structure. Since the magnetic steel in the second magnetic segment 20 is arranged in a Halbach manner, that is, in the second magnetic segment 20, the magnetization direction of the third permanent magnet 21 is parallel to the second direction, and the magnetization direction of the fourth permanent magnet 22 is parallel to the first direction, and the magnetization directions of the two adjacent third permanent magnets 21 are opposite, and the magnetization directions of the two adjacent fourth permanent magnets 22 are opposite, the second magnetic segment 20 can form a Halbach structure. That is to say, the magnetic steels in the first permanent magnet 11 and the second permanent magnet 12 are arranged in a Halbach manner, which can enhance the unilateral reinforcement effect of the motor secondary component 100, that is, effectively enhance the thrust of the linear motor.

[0090] In some specific embodiments of the present application, the size of the third permanent magnet 21 in the first direction is smaller than the size of the fourth permanent magnet 22 in the first direction.

[0091] Specifically, since the size of the fourth permanent magnet 22 in the first direction is larger than the size of the third permanent magnet 21, the size of the fourth permanent magnet 22 in the second direction is further optimized, thereby not only reducing the size of the fourth permanent magnet 22 in the second direction, but also increasing the size of the fourth permanent magnet 22 in the first direction, thereby fully reducing the traveling wave magnetic field and thrust fluctuation formed by the third permanent magnet 21, and maintaining the thrust output of the fourth permanent magnet 22, thereby improving the operating stability of the motor while reducing the use of magnetic steel.

[0092] According to some optional embodiments of the present application, the size of the first permanent magnet 11 in the first direction is equal to the size of the third permanent magnet 21 in the first direction, and the size of the second permanent magnet 12 in the first direction is equal to the size of the fourth permanent magnet 22 in the first direction.

[0093] Specifically, in the first direction, the size of the first permanent magnet 11 is equal to the size of the third permanent magnet 21, and the size of the second permanent magnet 12 is equal to the size of the fourth permanent magnet 22, so that the shape of the fourth permanent magnet 22 is consistent with that of the second permanent magnet 12, so that the third permanent magnet 21 can stably provide the main magnetic field and the fourth permanent magnet 22 can stably provide the magnetic path, thereby weakening the end effect of the motor secondary component 100 while maintaining the thrust of the motor secondary component 100.

[0094] According to some optional embodiments of the present application, the permanent magnet grade of the third permanent magnet 21 is greater than that of the first permanent magnet 11 , and the permanent magnet grade of the fourth permanent magnet 22 is greater than that of the second permanent magnet 12 .

[0095] Specifically, the permanent magnet grade of the third permanent magnet 21 can be N45 or N48, and the permanent magnet grade of the fourth permanent magnet 22 can be N50 or N52, which can be selected according to actual needs. Since the size of the third permanent magnet 21 is smaller than the size of the first permanent magnet 11 in the second direction, a material with a larger permanent magnet grade is selected to make the second permanent magnet 12, and the remanence and coercive force of the third permanent magnet 21 are enhanced, which can greatly reduce the occurrence of demagnetization of the second permanent magnet 12 at high temperature. At the same time, while reducing the amount of magnetic steel used in the third permanent magnet 21, the thrust of the motor secondary component 100 is maintained. In other words, the permanent magnet grade of the third permanent magnet 21 is greater than the grade of the first permanent magnet 11, which can make the magnetic force of the first permanent magnet 11 and the third permanent magnet 21 similar, and maintain the thrust output of the linear motor.

[0096] The fourth permanent magnet 22 is made of a material with a permanent magnet grade greater than that of the second permanent magnet 12, which can further enhance the remanence and coercive force of the fourth permanent magnet 22, maintain the thrust of the second magnetic segment 20, and increase the thrust at the end of the motor secondary component 100, thereby maintaining the use effect of the linear motor.

[0097] According to one embodiment of the present application, the maximum magnetic product energy of the third permanent magnet 21 is greater than the maximum magnetic product energy of the first permanent magnet 11 , and the maximum magnetic product energy of the fourth permanent magnet 22 is greater than the maximum magnetic product energy of the second permanent magnet 12 .

[0098] Specifically, when the permanent magnet brand of the fourth permanent magnet 22 is N50, the maximum magnetic product energy of the fourth permanent magnet 22 is in the range of 47-51MGOe, when the permanent magnet brand of the second permanent magnet 12 is 48, the maximum magnetic product energy of the second permanent magnet 12 is in the range of 46-48MGOe, or, when the permanent magnet brand of the fourth permanent magnet 22 is N52, the maximum magnetic product energy of the fourth permanent magnet 22 is in the range of 50-53MGOe, when the permanent magnet brand of the second permanent magnet 12 is 45, the maximum magnetic product energy of the second permanent magnet 12 is in the range of 38-40MGOe. When the permanent magnet brand of the third permanent magnet 21 is N45, the maximum magnetic product energy of the third permanent magnet 21 is in the range of 47-51MGOe, and when the permanent magnet brand of the first permanent magnet 11 is N42, the maximum magnetic product energy of the first permanent magnet 11 is in the range of 40-42MGOe; or, when the permanent magnet brand of the third permanent magnet 22 is N52, the maximum magnetic product energy of the third permanent magnet 22 is in the range of 50-53MGOe, and when the permanent magnet brand of the first permanent magnet 11 is N40, the maximum magnetic product energy of the first permanent magnet 11 is in the range of 38-40MGOe. The third permanent magnet 21 is made of a magnetic steel material with a large magnetic product energy. Since the size of the third permanent magnet 21 is smaller than that of the first permanent magnet 11 in the second direction, the thrust loss of the third permanent magnet 21 caused by the reduction in size is compensated by increasing the magnetic product energy of the third permanent magnet 21, thereby improving the thrust output of the third permanent magnet 21 and maintaining the high thrust and high efficiency of the motor secondary assembly 100. Since the fourth permanent magnet 22 is located at the end, the remanence and coercive force of the fourth permanent magnet 22 can be further improved by enhancing the maximum magnetic product energy of the fourth permanent magnet 22, thereby effectively reducing the end effect of the linear motor and making the linear motor run smoothly.

[0099] According to some other embodiments of the present application, the permanent magnet fixing plate 30 is an annular plate.

[0100] Specifically, since the permanent magnet fixing plate 30 is an annular plate, the permanent magnet fixing plate 30 can be mounted outside the motor secondary component 100 and move synchronously with the motor secondary component 100. The first permanent magnet 11, the second permanent magnet 12, the third permanent magnet 21 and the fourth permanent magnet 22 connected to the permanent magnet fixing plate 30 can all be distributed along the permanent magnet fixing plate 30 and form a ring, thereby providing a stable magnetic field.

[0101] In some specific embodiments of the present application, the permanent magnet fixing plate 30 is a circular plate, the permanent magnet mounting surface 31 is the inner wall surface of the circular plate, the first direction is parallel to the axial direction of the circular plate, and the second direction is the radial direction of the circular plate.

[0102] Optionally, the permanent magnet fixing plate 30 is a circular ring plate, and the permanent magnet mounting surface 31 is the inner wall surface of the permanent magnet fixing plate 30. Since the first connecting surface 13 of the first permanent magnet 11 and the second permanent magnet 12 and the second connecting surface 23 of the third permanent magnet 21 and the fourth permanent magnet 22 are connected to the permanent magnet mounting surface 31, the first permanent magnet 11, the second permanent magnet 12, the third permanent magnet 21 and the fourth permanent magnet 22 can be distributed along the permanent magnet fixing plate 30 and form a circular ring, further stabilizing the magnetic field provided in the linear motor. The second direction is the radial direction of the permanent magnet fixing plate 30, and the first direction is parallel to the axial direction of the permanent magnet fixing plate 30, that is, the magnetization direction of the first permanent magnet 11 and the third permanent magnet 21 is radial, and the magnetization direction of the second permanent magnet 12 and the fourth permanent magnet 22 is axial.

[0103] Thus, the magnetization directions of the multiple first permanent magnets 11 and the multiple second permanent magnets 12 in a unit permanent magnet are radial magnetization toward the center of the annular plate, axial magnetization toward one second magnetic segment 20, radial magnetization away from the center of the annular plate, axial magnetization toward another second magnetic segment 20, and the above reciprocating forms a cycle. That is to say, the first permanent magnet 11 is a radially magnetized permanent magnet, and the second permanent magnet 12 is an axially magnetized permanent magnet.

[0104] According to some optional embodiments of the present application, the first magnetic segment 10 and the second magnetic segment 20 are respectively formed into a circular ring structure.

[0105] Specifically, the first permanent magnet 11, the second permanent magnet 12, the third permanent magnet 21 and the fourth permanent magnet 22 are all circular ring structures. Therefore, the outer wall surfaces of the first permanent magnet 11, the second permanent magnet 12, the third permanent magnet 21 and the fourth permanent magnet 22 can be attached to and connected to the permanent magnet mounting surface 31, which can effectively improve the connection firmness between the first magnetic segment 10 and the second magnetic segment 20.

[0106] Optionally, the first permanent magnet 11 and the second permanent magnet 12 can both be a sector ring block structure, and the circular ring is cut into two non-overlapping straight lines starting from the center of the circle, and the cut portion is a sector ring block. Multiple first permanent magnets 11 are arranged along the permanent magnet mounting surface 31, and optionally, multiple first permanent magnets 11 are connected end to end in sequence and arranged along the permanent magnet mounting surface 31, that is, multiple first permanent magnets 11 can form a circular ring structure; multiple first permanent magnets 11 can be arranged along the permanent magnet mounting surface 31 at intervals. Multiple second permanent magnets 12 are arranged along the permanent magnet mounting surface 31, and optionally, multiple second permanent magnets 12 are connected end to end in sequence and arranged along the permanent magnet mounting surface 31, that is, multiple second permanent magnets 12 can form a circular ring structure; multiple second permanent magnets 12 can be arranged along the permanent magnet mounting surface 31 at intervals.

[0107] Therefore, by forming the motor secondary assembly 100 with multiple sector ring blocks, the magnetic field formed by the multiple first permanent magnets 11 and the magnetic field formed between the multiple second permanent magnets 12 are effectively improved, that is, the thrust in the motor secondary assembly 100 is strengthened, and the operation and use effect of the motor are improved.

[0108] The embodiment of the present application also provides a linear motor, which includes a motor secondary assembly 100 according to any of the above embodiments. Since the motor secondary assembly 100 according to the embodiment of the present application has the above technical effects, the linear motor according to the embodiment of the present application also has corresponding technical effects, that is, since the second magnetic segment 20 is arranged at the end of the first magnetic segment 10 and the size of the second magnetic segment 20 in the second direction is reduced, the distortion of the air gap magnetic field is reduced, the end effect force caused by the uneven distribution of the magnetic field can be effectively reduced, the thrust fluctuation of the motor during operation is reduced, and the operation stability and effect of the motor are effectively improved.

[0109] According to some optional embodiments of the present application, the linear motor also includes a motor primary component 200, wherein the motor primary component 200 includes an iron core 201 and a winding 202, and the winding 202 is arranged on the iron core 201; the permanent magnet fixing plate 30 is a circular ring plate, the permanent magnet mounting surface 31 is the inner wall surface of the circular ring plate, and the motor secondary component 100 is sleeved on the motor primary component 200.

[0110] Specifically, the linear motor is composed of a motor secondary component 100 and a motor primary component 200, and the motor secondary component 100 is sleeved on the motor primary component 200, and the permanent magnet fixing plate 30 is sleeved outside the motor secondary component 100, and the motor secondary component 100 can move along the axial direction of the iron core 201. In the first direction, the size of the motor primary component 200 is larger than the size of the motor secondary component 100, that is, a structure in which the motor secondary component 100 is short and the motor primary component 200 is long is formed in the linear motor. The motor primary component 200 is composed of an iron core 201 and a winding 202, and the winding 202 is wound outside the iron core 201.

[0111] As a result, the air gap magnetic field distribution of the linear motor presents a non-closed, linear distribution, and the two ends of the stator side of the linear motor are disconnected, resulting in an asymmetrical distribution of the three-phase winding 202, so that the magnetic flux distribution in the gap formed between the motor secondary component 100 and the motor primary component 200 is uneven, the air gap magnetic field is distorted, and the end effect force directly acts on the motor, the motor generates vibration and noise, the motor control difficulty increases, and the end effect and thrust fluctuation are generated. Therefore, the motor secondary component 100 includes a first magnetic segment 10 and a second magnetic segment 20. In the second direction, the size of the second magnetic segment 20 is smaller than the size of the first magnetic segment 10, that is, the size of the second magnetic segment 20 is reduced, and then the thickness of the two ends of the motor secondary component 100 is reduced, and then the traveling wave magnetic field between the second magnetic segment 20 and the iron core 201 is reduced, the air gap magnetic field distortion is weakened, and the leakage magnetic phenomenon is reduced. When the magnetic field of the motor primary component 200 interacts with the magnetic field of the second magnetic segment 20, compared with the structure in which the size of the second magnetic segment 20 is not reduced, the thrust fluctuation is greatly reduced, which effectively improves the stability of the motor operation and maintains the magnitude of the motor thrust.

[0112] Optionally, the linear motor further comprises a sliding bearing, a first end of which is connected to the second mating surface 24 of the second magnetic segment 20, that is, the sliding bearing is embedded in the second magnetic segment 20, and a second end of the sliding bearing is connected to the iron core 201. Thus, the mechanical friction between the sliding bearing and the primary of the motor can be effectively reduced, and the output efficiency and thrust can be improved.

[0113] According to some optional embodiments of the present application, in the second direction, the distance between the second matching surface 24 and the outer wall surface of the core 201 is H2, and the range of H2 is: 1 / 7L2≤H2≤L2.

[0114] Specifically, in the second direction, a first gap can be formed between the second mating surface 24 and the outer wall surface of the iron core 201, and the distance between the second mating surface 24 and the outer wall surface of the iron core 201 is H2. The relationship between H2 and the size L2 of the second magnetic segment 20 satisfies 1 / 7L2≤H2≤L2. Optionally, the relationship between H2 and L2 can be H2=1 / 7L2; the relationship between H2 and L2 can be H2=3 / 7L2; the relationship between H2 and L2 can be H2=L2, which can be adjusted according to actual needs.

[0115] In some specific embodiments of the present application, the iron core 201 is formed into a tooth slot structure. The iron core 201 with a tooth slot structure is used as the motor primary assembly 200, which effectively improves the thrust density in the linear motor, so that the motor secondary assembly 100 has a smaller number of magnets, which can maintain the operation effect of the linear motor; and can also improve the heat dissipation effect of the linear motor.

[0116] According to some optional embodiments of the present application, the distribution of the winding 202 adopts a fractional slot structure, and the winding 202 is not shown in the figure. Compared with the integer slot structure, the thrust fluctuation of the fractional slot structure is greatly reduced, which can further reduce the noise generated by the motor and improve the running stability of the motor.

[0117] Thus, the relationship between the size of the second magnetic segment 20 and the size of the first gap in the second direction is optimized. By appropriately reducing the size of the second magnetic segment 20, the traveling wave magnetic field, air gap magnetic field distortion and magnetic leakage between the second magnetic segment 20 and the iron core 201 can be weakened, thereby reducing the thrust fluctuation of the motor and improving the running stability of the motor. If the size of the second magnetic segment 20 in the second direction is too large, the impact on the thrust fluctuation of the motor is small, and the motor still has the problem of poor stability. If the size of the second magnetic segment 20 in the second direction is too small, the impact on the thrust of the motor is large, that is, the thrust at the second magnetic segment 20 is small, so that the thrust of the motor is affected.

[0118] According to some optional embodiments of the present application, in the second direction, since the size of the first permanent magnet 11 is larger than the size of the second permanent magnet 12, a second gap can be formed between the first mating surface 14 and the outer wall surface of the iron core 201, and a third gap can be formed between the fourth mating surface 121 and the outer wall surface of the iron core 201. The size of the third gap is larger than the second gap, and since the first permanent magnet 11 and the second permanent magnet 12 are alternately distributed, the second gap and the third gap are alternately arranged.

[0119] Since the air gap magnetic field distribution of the linear motor is non-closed and linear, the two ends of the stator side of the linear motor are disconnected, resulting in an asymmetrical distribution of the three-phase winding 202, which makes the magnetic flux distribution in the gap formed between the motor secondary component 100 and the motor primary component 200 uneven, and the air gap magnetic field is distorted. In addition, the core tooth structure will also generate tooth positioning force, that is, there are many other forces in the linear motor that affect the thrust.

[0120] Therefore, through the alternating and fluctuating gap distribution formed between the first magnetic segment 10 and the outer wall of the core 201, the toothing force and thrust fluctuation of the linear motor are effectively reduced, the operation stability of the linear motor is improved, and the linear motor obtains large thrust and high efficiency.

[0121] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A motor secondary assembly, characterized in that: include: A permanent magnet fixing plate, wherein the permanent magnet fixing plate has a permanent magnet mounting surface; A permanent magnet assembly, the permanent magnet assembly is arranged on the permanent magnet mounting surface, and the permanent magnet assembly comprises: A first magnetic segment, the first magnetic segment is arranged along a first direction, the first magnetic segment has a first mating surface, and the first mating surface is arranged on a side away from the permanent magnet installation surface; a second magnetic segment, the second magnetic segment is arranged along the first direction, and the second magnetic segment is arranged at an end of one end of the first magnetic segment in the first direction, the second magnetic segment is arranged close to the first end of the permanent magnet fixing plate in the first direction, the second magnetic segment has a second mating surface, and the second mating surface is arranged on a side away from the permanent magnet mounting surface; in the second direction, the distance between the first mating surface and the permanent magnet mounting surface is L1, and the distance between the second mating surface and the permanent magnet mounting surface is L2, and L1 is greater than L2; The second direction is perpendicular to the first direction, and the second direction is perpendicular to the permanent magnet installation surface.

2. The motor subassembly according to claim 1, characterized in that: The permanent magnet assembly also includes: A third magnetic segment, wherein the third magnetic segment is arranged along the first direction, and the third magnetic segment and the second magnetic segment are respectively located at two ends of the first magnetic segment in the first direction, the third magnetic segment is arranged close to the second end of the permanent magnet fixing plate in the first direction, the third magnetic segment has a third mating surface, and the third mating surface is arranged on a side away from the permanent magnet mounting surface. In the second direction, the distance between the third mating surface and the permanent magnet mounting surface is S1, and L1 is greater than S1.

3. The motor subassembly according to claim 2, characterized in that: The second magnetic segment has the same structure as the third magnetic segment.

4. The motor subassembly according to claim 1, characterized in that: The size of the second magnetic segment in the first direction is H1, the sum of the sizes of the first magnetic segment and the second magnetic segment in the first direction is L, and the range of H1 is: 1 / 16L≤H1≤1 / 3L.

5. The motor subassembly according to claim 1, characterized in that: The first magnetic segment includes a plurality of first permanent magnets and a plurality of second permanent magnets, the plurality of first permanent magnets and the plurality of second permanent magnets are alternately arranged on the permanent magnet mounting surface along the first direction, the magnetization direction of each of the first permanent magnets is respectively parallel to the second direction, and the magnetization direction of each of the second permanent magnets is respectively parallel to the first direction; The first permanent magnet has the first mating surface, the second permanent magnet has a fourth mating surface, the fourth mating surface is arranged on the side away from the permanent magnet mounting surface, and in the second direction, the distance between the fourth mating surface and the permanent magnet mounting surface is L3, and L1 is greater than L3.

6. The motor subassembly according to claim 5, characterized in that: L2=L3.

7. The motor subassembly according to claim 5, characterized in that: The relationship between L3 and L1 satisfies: 1 / 2L1≤L3≤7 / 8L1.

8. The motor subassembly according to claim 5, characterized in that: A size of the first permanent magnet in the first direction is smaller than a size of the second permanent magnet in the first direction.

9. The motor subassembly according to claim 5, characterized in that: The permanent magnet brand of the second permanent magnet is greater than the permanent magnet brand of the first permanent magnet.

10. The motor subassembly according to claim 5, characterized in that: The maximum magnetic product energy of the second permanent magnet is greater than the maximum magnetic product energy of the first permanent magnet.

11. The motor subassembly according to claim 5, characterized in that: The adjacent first permanent magnets and the second permanent magnets cooperate to form a pole pair, and four adjacent pole pairs constitute a unit permanent magnet. In the first direction, the size of the unit permanent magnet is H, and the sum of the sizes of the first magnetic segment and the second magnetic segment in the first direction is L. The range of H is: L / H=n, where n is a positive integer.

12. The motor subassembly according to claim 11, characterized in that: Said n≥6.

13. The motor subassembly according to claim 5, characterized in that: The second magnetic segment includes a plurality of third permanent magnets and a plurality of fourth permanent magnets, wherein the plurality of third permanent magnets and the plurality of fourth permanent magnets are alternately arranged on the permanent magnet mounting surface along the first direction, and the third permanent magnets and the fourth permanent magnets respectively have the second matching surfaces. ， In the second direction, a size of the third permanent magnet is the same as a size of the fourth permanent magnet.

14. The motor subassembly according to claim 1, characterized in that: The first magnetic segment and the second magnetic segment respectively include a plurality of magnetic steels arranged along the first direction, and the magnetic steels of the first magnetic segment and the second magnetic segment are arranged in a Halbach pattern.

15. The motor subassembly according to claim 1, characterized in that: The permanent magnet fixing plate is an annular plate.

16. The motor subassembly according to claim 15, characterized in that: The permanent magnet fixing plate is a circular ring plate, the permanent magnet mounting surface is the inner wall surface of the circular ring plate, the first direction is parallel to the axial direction of the circular ring plate, and the second direction is the radial direction of the circular ring plate.

17. The motor subassembly according to claim 15, characterized in that: The first magnetic segment and the second magnetic segment are respectively formed into annular structures.

18. A linear motor, characterized in that: The invention comprises a motor subassembly as claimed in any one of claims 1 to 17.

19. The linear motor according to claim 18, characterized in that: Also includes: A primary motor component, the primary motor component comprising an iron core and a winding, wherein the winding is arranged on the iron core; The permanent magnet fixing plate is a circular ring-shaped plate, the permanent magnet mounting surface is the inner wall surface of the circular ring-shaped plate, and the motor secondary component is sleeved on the motor primary component.

20. The linear motor according to claim 18, characterized in that: In the second direction, the distance between the second matching surface and the outer wall surface of the core is H2, and the range of H2 is: 1 / 7L2≤H2≤L2.

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