Secondary assembly for linear motor, linear motor, electromagnetic suspension and vehicle

Abstract

The invention provides a secondary assembly for a linear motor, the linear motor, an electromagnetic suspension and a vehicle, and the secondary assembly comprises a first permanent magnet, and the magnetizing direction of the first permanent magnet is parallel to the first direction; the permanent magnet fixing plate is provided with a permanent magnet mounting surface, and the first permanent magnet is arranged on the permanent magnet mounting surface; the first permanent magnet comprises a first end face, a second end face and a first connecting face, the first end face and the second end face are sequentially arranged at intervals in the first direction, the first connecting face is arranged on the side away from the permanent magnet installation face, and the first permanent magnet further comprises a second connecting face which is arranged on the side close to the permanent magnet installation face. According to the scheme, the first connecting surface and the second connecting surface can be respectively arranged on the first permanent magnet, so that an easy demagnetization area of the permanent magnet is effectively removed, the irreversible demagnetization risk of the permanent magnet is reduced, and the thrust fluctuation of the linear motor is further reduced.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a secondary component for a linear motor, a linear motor, an electromagnetic suspension and a vehicle. Background Art

[0002] A linear motor is a transmission device that converts electrical energy directly into mechanical energy of linear motion without the need for any intermediate conversion mechanism. It is widely used due to its simple structure, high precision, and corresponding performance numbers.

[0003] In the related technology, the windings and permanent magnets are usually arranged on the primary component and the secondary component respectively. During the operation of the motor, the primary component and the secondary component will perform relative linear motion. Under the frequent reciprocating motion state, the primary component will generate a large amount of heat, which may easily cause the permanent magnet to suffer from severe local demagnetization due to excessive temperature, thereby causing large thrust fluctuations of the linear motor. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] In view of the existing problems, the present application provides, on one hand, a secondary assembly for a linear motor, comprising: a first permanent magnet;

[0006] A permanent magnet fixing plate, wherein the permanent magnet fixing plate has a permanent magnet mounting surface, and the first permanent magnet is arranged on the permanent magnet mounting surface;

[0007] The first permanent magnet comprises a first end face and a second end face which are sequentially arranged in a spaced relationship along a first direction, and a first connecting face which connects the first end face and the second end face, wherein the first connecting face is arranged at a side away from the permanent magnet installation face;

[0008] The first permanent magnet further comprises a second connection surface connecting the first end surface and the second end surface (103), wherein the second connection surface is arranged on a side close to the permanent magnet installation surface;

[0009] In the projection of the first permanent magnet on the first plane, the distance in the first direction from one end of the first connecting surface connected to the first end surface to one end of the first connecting surface close to the second end surface is a first distance, and the distance in the first direction from one end of the second connecting surface connected to the first end surface to one end of the second connecting surface close to the second end surface is a second distance, and the first distance is greater than the second distance;

[0010] Wherein, the first plane is perpendicular to the permanent magnet installation surface and parallel to the first direction.

[0011] Exemplarily, in the projection of the first permanent magnet on the first plane, the distance from one end of the first connecting surface close to the second end surface to the permanent magnet mounting surface is the maximum distance from the first connecting surface to the permanent magnet mounting surface;

[0012] In the projection of the first permanent magnet on the first plane, the distance from one end of the second connecting surface connected to the first end surface to the permanent magnet installation surface is the maximum distance from the second connecting surface to the permanent magnet installation surface;

[0013] In the projection of the first permanent magnet on the first plane, in the first direction, the distance from one end of the first connecting surface connecting the first end surface to the second end surface is the maximum distance from the first connecting surface to the second end surface;

[0014] In the projection of the first permanent magnet on the first plane, in the first direction, the distance from one end of the second connecting surface connecting the first end surface to the second end surface is the maximum distance from the second connecting surface to the second end surface.

[0015] Exemplarily, the first permanent magnet also includes a third connecting surface, the third connecting surface is connected to the second connecting surface, the third connecting surface is arranged on a side close to the permanent magnet mounting surface, and the third connecting surface is parallel to the permanent magnet mounting surface.

[0016] Exemplarily, in the projection of the first permanent magnet on the first plane, the distance from one end of the first connecting surface connected to the first end surface to the permanent magnet mounting surface is the minimum distance from the first connecting surface to the permanent magnet mounting surface.

[0017] Exemplarily, in the projection of the first permanent magnet on the first plane, the distance from the end of the second connecting surface away from the first end surface to the permanent magnet mounting surface is the minimum distance from the second connecting surface to the permanent magnet mounting surface.

[0018] Exemplarily, in the projection of the first permanent magnet on the first plane, the difference between the distance from one end of the first connecting surface close to the second end surface to the permanent magnet mounting surface and the distance from one end of the first connecting surface connected to the first end surface to the permanent magnet mounting surface is greater than the difference between the distance from one end of the second connecting surface connected to the first end surface to the permanent magnet mounting surface and the distance from one end of the second connecting surface far from the first end surface to the permanent magnet mounting surface.

[0019] Exemplarily, the first permanent magnet further includes a fourth connecting surface, the fourth connecting surface is connected to the second end surface, the first connecting surface and the fourth connecting surface are at least indirectly connected, and the fourth connecting surface is arranged on a side away from the permanent magnet mounting surface;

[0020] The first permanent magnet further includes a fifth connecting surface, the fifth connecting surface is connected to the second end surface, the fifth connecting surface is at least indirectly connected to the second connecting surface, and the fifth connecting surface is arranged on a side close to the permanent magnet mounting surface;

[0021] In the projection of the first permanent magnet on the first plane, the distance in the first direction from one end of the fourth connecting surface connected to the second end surface to one end of the fourth connecting surface close to the first end surface is a third distance, and the distance in the first direction from one end of the fifth connecting surface away from the second end surface to one end of the fifth connecting surface connected to the second end surface is a fourth distance, and the third distance is greater than the fourth distance;

[0022] In the projection of the first permanent magnet on the first plane, the distance from the end of the fourth connecting surface close to the first end surface to the permanent magnet installation surface is the maximum distance from the fourth connecting surface to the permanent magnet installation surface;

[0023] In the projection of the first permanent magnet on the first plane, the distance from one end of the fifth connecting surface connected to the second end surface to the permanent magnet installation surface is the maximum distance from the fifth connecting surface to the permanent magnet installation surface;

[0024] In the projection of the first permanent magnet on the first plane, in the first direction, the distance from one end of the fourth connecting surface connected to the second end surface to the first end surface is the maximum distance from the fourth connecting surface to the first end surface;

[0025] In the projection of the first permanent magnet on the first plane, in the first direction, the distance from one end of the fifth connecting surface connected to the second end surface to the first end surface is the maximum distance from the fifth connecting surface to the first end surface.

[0026] Exemplarily, the maximum distances between the first connection surface and the fourth connection surface and the permanent magnet installation surface are the same, and the minimum distances between the first connection surface and the fourth connection surface and the permanent magnet installation surface are the same.

[0027] Exemplarily, the maximum distances between the second connection surface and the fifth connection surface and the permanent magnet installation surface are the same, and the minimum distances between the second connection surface and the fifth connection surface and the permanent magnet installation surface are the same.

[0028] Exemplarily, the first connecting surface is an arc surface, the second connecting surface is an arc surface, the projections of the first connecting surface and the second connecting surface on the first plane are respectively a first arc curve and a second arc curve, and the radius of the first arc curve is greater than the radius of the second arc curve.

[0029] Exemplarily, the first connecting surface is a plane, the second connecting surface is a plane, the projections of the first connecting surface and the second connecting surface on the first plane are respectively a first oblique line and a second oblique line, and the length of the first oblique line is greater than the length of the second oblique line.

[0030] Exemplarily, the first connecting surface and the fourth connecting surface are both arc surfaces, and the projections of the first connecting surface and the fourth connecting surface on the first plane are respectively the first arc curve and the second arc curve, and the second connecting surface and the fifth connecting surface are both arc surfaces, and the projections of the second connecting surface and the fifth connecting surface on the first plane are respectively the third arc curve and the fourth arc curve.

[0031] Exemplarily, the radii of the first arc curve and the second arc curve are the same, both are the first radius, the radii of the third arc curve and the fourth arc curve are the same, both are the second radius, and the first radius is greater than the second radius.

[0032] Exemplarily, the first connecting surface and the fourth connecting surface are both arc surfaces, the projections of the first connecting surface and the fourth connecting surface on the first plane are respectively a first arc curve and a second arc curve, and the radii of the first arc curve and the second arc curve are the same, which are both the first radius;

[0033] The thickness of the first permanent magnet in the first direction is a first thickness, and the first radius is less than half of the first thickness.

[0034] Exemplarily, the first connecting surface and the fourth connecting surface are both arc surfaces, the projections of the first connecting surface and the fourth connecting surface on the first plane are respectively a first arc curve and a second arc curve, and the radii of the first arc curve and the second arc curve are the same, which are both the first radius;

[0035] The thickness of the first permanent magnet in the first direction is a first thickness, the first radius is equal to half of the first thickness, and the first connecting surface is directly connected to the fourth connecting surface.

[0036] Exemplarily, it also includes:

[0037] A second permanent magnet, wherein the magnetization direction of the second permanent magnet is a second direction, the second direction is perpendicular to the magnetization direction of the first permanent magnet, the magnetization direction of the first permanent magnet is parallel to the first direction, the second permanent magnet is arranged on the permanent magnet mounting surface, and the first permanent magnet and the second permanent magnet are alternately arranged along the first direction.

[0038] Exemplarily, the second permanent magnet includes a third end face and a fourth end face sequentially arranged at intervals along the first direction, and a sixth connecting face connecting the third end face and the fourth end face, and the sixth connecting face is arranged on a side away from the permanent magnet mounting surface;

[0039] The sixth connection surface includes a first sub-connection surface, and the first sub-connection surface is connected to the third end surface;

[0040] In the projection of the second permanent magnet on the first plane, the distance in the first direction from the end of the first sub-connection surface connected to the third end surface to the end of the first sub-connection surface close to the fourth end surface is a fifth distance, and the first distance is greater than the fifth distance;

[0041] In the projection of the second permanent magnet on the first plane, the distance from the end of the first sub-connection surface close to the fourth end surface to the permanent magnet installation surface is the maximum distance from the first sub-connection surface to the permanent magnet installation surface;

[0042] In the projection of the second permanent magnet on the first plane, in the first direction, the distance from one end of the first sub-connection surface connected to the third end surface to the fourth end surface is the maximum distance from the first sub-connection surface to the fourth end surface.

[0043] Exemplarily, the sixth connection surface further includes a second sub-connection surface and a third sub-connection surface, the first sub-connection surface connects the third end surface and the second sub-connection surface, the third sub-connection surface connects the fourth end surface and the second sub-connection surface, and the second sub-connection surface is parallel to the permanent magnet mounting surface;

[0044] In the projection of the second permanent magnet on the first plane, the distance from one end of the third sub-connection surface connected to the second sub-connection surface to the permanent magnet installation surface is the maximum distance from the third sub-connection surface to the permanent magnet installation surface;

[0045] In the projection of the second permanent magnet on the first plane, in the first direction, the distance from one end of the third sub-connection surface connected to the fourth end surface to the third end surface is the maximum distance from the third sub-connection surface to the third end surface;

[0046] The third sub-connection surface and the first sub-connection surface have the same maximum distance from the permanent magnet installation surface, and the third sub-connection surface and the first sub-connection surface have the same minimum distance from the permanent magnet installation surface.

[0047] Exemplarily, the first connecting surface is an arc surface, the projection of the first connecting surface on the first plane is a first arc curve, and the radius of the first arc curve is recorded as a first radius;

[0048] The first sub-connecting surface is an arc surface, and the projection of the first sub-connecting surface on the first plane is a fifth arc curve. The radius of the fifth arc curve is recorded as a third radius, and the third radius is smaller than the first radius.

[0049] Exemplarily, the permanent magnet fixing plate is an annular plate, and the permanent magnet mounting surface is an inner wall surface of the annular plate.

[0050] Exemplarily, the first permanent magnet is formed by splicing a plurality of sector-shaped magnetic steel blocks.

[0051] On the other hand, the present application provides a linear motor, comprising the above-mentioned secondary component.

[0052] Exemplarily, it further includes: a primary component, the primary component includes a cylindrical stator core and a winding arranged on the stator core, and the secondary component is sleeved on the outside of the primary component.

[0053] Exemplarily, the stator core is cylindrical, the permanent magnet fixing plate is a circular ring-shaped plate, and the permanent magnet mounting surface is the inner wall surface of the circular ring-shaped plate.

[0054] On the other hand, the present application provides an electromagnetic suspension, comprising the above-mentioned linear motor.

[0055] On the other hand, the present application provides a vehicle, including the above-mentioned linear motor, or, including the above-mentioned electromagnetic suspension.

[0056] The secondary component for a linear motor, the linear motor, the electromagnetic suspension and the vehicle of the present application are configured by setting a first connecting surface on the side of the first permanent magnet of the secondary component for the linear motor away from the permanent magnet mounting surface, and setting a second connecting surface on the side of the first permanent magnet close to the permanent magnet mounting surface, and in the projection of the first permanent magnet on the first plane, the distance in the first direction from one end of the first connecting surface connecting the first end face to one end of the first connecting surface close to the second end face is a first distance, and the distance in the first direction from one end of the second connecting surface connecting the first end face to one end of the second connecting surface close to the second end face is a second distance, and the first distance is greater than the second distance, which effectively removes the easily demagnetized area of ​​the permanent magnet, reduces the risk of irreversible demagnetization of the permanent magnet, and thereby reduces the thrust fluctuation of the linear motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The above and other purposes, features and advantages of the present invention will become more apparent by describing the embodiments of the present invention in more detail in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0058] In the attached figure:

[0059] Figure 1A A cross-sectional schematic diagram of a secondary assembly for a linear motor according to a specific embodiment of the present application is shown;

[0060] Figure 1B A cross-sectional schematic diagram of a first permanent magnet in a specific embodiment of the present application is shown;

[0061] Figure 1C A cross-sectional schematic diagram of a first permanent magnet in a specific embodiment of the present application is shown;

[0062] Figure 1D A cross-sectional schematic diagram of a second permanent magnet in a specific embodiment of the present application is shown;

[0063] Figure 1E A cross-sectional schematic diagram of a linear motor according to a specific embodiment of the present application is shown;

[0064] Figure 1F A schematic diagram of the structure of a second permanent magnet in a specific embodiment of the present application is shown;

[0065] Figure 2 A schematic diagram showing the high-temperature demagnetization magnetic field strength of a permanent magnet according to a specific embodiment of the present application is shown. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical scheme and advantages of the present invention more obvious, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described herein. Based on the embodiments of the present invention described in the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the present invention.

[0067] First refer to Figure 1A and Figure 1B To describe the secondary assembly for the linear motor according to the embodiment of the present application. Figure 1AA cross-sectional schematic diagram of a secondary assembly for a linear motor according to a specific embodiment of the present application is shown. Figure 1B A cross-sectional schematic diagram of a first permanent magnet according to a specific embodiment of the present application is shown.

[0068] In the related art, a linear motor usually includes a primary component and a secondary component. The primary component includes an iron core and a winding arranged on the iron core, and the secondary component includes a shell and a magnet arranged on the shell, and an air gap is provided between the magnet and the iron core. When the linear motor works for a period of time, or the thrust that the linear motor needs to achieve is large, the current passed through the winding is large, which easily causes the winding temperature to rise, and some magnets close to the winding are severely demagnetized due to the influence of high temperature.

[0069] After many tests, it was found that the demagnetization of the magnetic steel is mainly in the corners of the magnetic steel. Therefore, the present application proposes the following technical solutions: for example, by removing the material in the corners of the magnetic steel close to the winding, the problem of uneven magnetic density caused by high temperature is reduced. At the same time, in order to make the edge magnetic steel not too sharp, more material is removed from the corners of the magnetic steel close to the winding, while less material is removed from the corners away from the corners, which will not cause a significant impact on the magnetic steel.

[0070] like Figure 1A As shown, the secondary assembly for the linear motor includes a first permanent magnet 101 and a permanent magnet fixing plate 115, wherein the first permanent magnet 101 and the permanent magnet fixing plate 115 include a permanent magnet mounting surface 116, and the first permanent magnet 101 is arranged on the permanent magnet mounting surface 116. Exemplarily, the first direction is the linear motion direction of the linear motor. Exemplarily, the first permanent magnet 101 can be arranged on the permanent magnet mounting surface 116 by bonding or other suitable methods. In some examples, such as Figure 1A and Figure 1B As shown, the first permanent magnet includes a first end face 102 and a second end face 103 which are arranged in sequence along a first direction, and a first connecting face 104 connecting the first end face 102 and the second end face 103, wherein the first connecting face 104 is arranged on a side away from the permanent magnet mounting face 116. Exemplarily, the first end face 102 and the second end face 103 are perpendicular to the first direction. Exemplarily, the first connecting face 104 plays a role in connecting the first end face 102 and the second end face 103, which does not mean that the first connecting face 104 and the first end face 102 or the second end face 103 are directly connected, and the first connecting face 104 and the first end face 102 or the second end face 103 may be indirectly connected, for example, as Figure 1A and Figure 1B As shown, the first connection surface 104 is directly connected to the first end surface 102 , and the first connection surface 104 is indirectly connected to the second end surface 103 .

[0071] In some examples, such as Figure 1A and Figure 1B As shown, the first permanent magnet further includes a second connection surface 105 connecting the first end surface 102 and the second end surface 103, wherein the second connection surface 105 is arranged on a side close to the permanent magnet mounting surface 116. Exemplarily, the second connection surface 105 plays a role of connecting the first end surface 102 and the second end surface 103, which does not mean that the second connection surface 105 and the first end surface 102 or the second end surface 103 are directly connected, and the second connection surface 105 and the first end surface 102 or the second end surface 103 may be indirectly connected, for example, as Figure 1A and Figure 1B As shown, the second connection surface 105 is directly connected to the first end surface 102, and the second connection surface 105 is indirectly connected to the second end surface 103. Exemplarily, the first connection surface 104 and the second connection surface 105 can be formed by chamfering design. Exemplarily, the first connection surface 104 and the second connection surface 105 can be arc surfaces, planes, curved surfaces or any other suitable irregular surfaces.

[0072] In some examples, such as Figure 1B As shown, in the projection of the first permanent magnet 101 on the first plane, the distance in the first direction from the end of the first connecting surface 104 connecting the first end surface 102 to the end of the first connecting surface 104 close to the second end surface 103 is the first distance L1, and the distance in the first direction from the end of the second connecting surface 105 connecting the first end surface 102 to the end of the second connecting surface 105 close to the second end surface 103 is the second distance L2, wherein the first distance L1 is greater than the second distance L2. Exemplarily, the end of the first connecting surface 104 close to the second end surface 103 is also the end of the first connecting surface 104 away from the first end surface 102. Exemplarily, the end of the second connecting surface 105 close to the second end surface 103 is also the end of the second connecting surface 105 away from the first end surface 102.

[0073] Exemplarily, when this embodiment is used for a cylindrical linear motor, the first direction is parallel to the axial direction of the cylindrical linear motor, and the first permanent magnet 101 can be an axially magnetized permanent magnet, such as Figure 2 As shown, the areas prone to irreversible demagnetization at high temperatures are mainly distributed in the axially magnetized permanent magnets, and the areas prone to irreversible demagnetization of the axially magnetized permanent magnets are mainly concentrated in the corners, especially on the side of the axially magnetized permanent magnets away from the permanent magnet mounting surface. Therefore, by setting the first connecting surface 104 and the second connecting surface 105, and making the first distance L1 greater than the second distance L2, the areas prone to demagnetization can be effectively removed, greatly reducing the risk of irreversible demagnetization of the axially magnetized permanent magnets, thereby reducing the thrust fluctuation of the linear motor, and will not affect the magnetism of the first permanent magnet 101 too much.

[0074] Exemplarily, the first plane is perpendicular to the permanent magnet mounting surface 116 and parallel to the first direction.

[0075] In some embodiments, the first connecting surface 104 and the second connecting surface 105 can be obtained by removing material, for example, the first connecting surface 104 and the second connecting surface 105 are both obtained by chamfering, for example, the first connecting surface 104 is a large chamfer, and the second connecting surface 105 is a small chamfer; the first connecting surface 104 mainly plays a role in solving the problem of demagnetization caused by high temperature, thereby ensuring that the magnetic density is relatively uniform and reducing the thrust fluctuation of the linear motor; and the second connecting surface 105 is far away from the high temperature area, but the setting of the second connecting surface 105 can reduce the risk of scratches caused by the sharp edge of the magnetic steel during the actual installation process, so the second connecting surface 105 can be a small chamfer.

[0076] In some examples, in the projection of the first permanent magnet 101 on the first plane, a distance M1 from an end of the first connecting surface 104 away from the first end surface 102 to the permanent magnet mounting surface 116 is a maximum distance from the first connecting surface 104 to the permanent magnet mounting surface 116 .

[0077] In some examples, in the projection of the first permanent magnet 101 on the first plane, a distance Q1 from one end of the second connecting surface 105 connecting the first end surface 102 to the permanent magnet mounting surface 116 is the maximum distance from the second connecting surface 105 to the permanent magnet mounting surface 116 .

[0078] In some examples, in the projection of the first permanent magnet 101 on the first plane, in the first direction, a distance H1 from one end of the first connecting surface 104 connecting the first end surface 102 to the second end surface 103 is a maximum distance from the first connecting surface 104 to the second end surface 103 .

[0079] In some examples, in the projection of the first permanent magnet 101 on the first plane, in the first direction, a distance H2 from one end of the second connecting surface 105 connecting the first end surface 102 to the second end surface 103 is a maximum distance from the second connecting surface 105 to the second end surface 103 .

[0080] In some examples, such as Figure 1A and Figure 1B As shown, the first permanent magnet 101 further includes a third connection surface 106, the third connection surface 106 is connected to the second connection surface 105, the third connection surface 106 is arranged on a side close to the permanent magnet mounting surface 116, and the third connection surface 106 is parallel to the permanent magnet mounting surface 116. Exemplarily, the end of the second connection surface 105 close to the second end surface 103 is also the end of the second connection surface 105 connected to the third connection surface 106.

[0081] In some examples, in the projection of the first permanent magnet 101 on the first plane, a distance M2 from one end of the first connecting surface 104 connecting the first end surface 102 to the permanent magnet mounting surface 116 is the minimum distance from the first connecting surface 104 to the permanent magnet mounting surface 116 .

[0082] In some examples, in the projection of the first permanent magnet 101 on the first plane, a distance Q2 from the end of the second connection surface 105 away from the first end surface 102 to the permanent magnet mounting surface 116 is the minimum distance from the second connection surface 105 to the permanent magnet mounting surface 116. Exemplarily, when the first permanent magnet 101 is in close contact with the permanent magnet mounting surface 116, Q2 is zero.

[0083] In some examples, in the projection of the first permanent magnet 101 on the first plane, a difference between a distance M1 from an end of the first connecting surface 104 away from the first end face 102 to the permanent magnet mounting surface 116 and a distance M2 from an end of the first connecting surface 104 connecting the first end face 102 to the permanent magnet mounting surface 116 is greater than a difference between a distance Q1 from an end of the second connecting surface 105 connecting the first end face 102 to the permanent magnet mounting surface 116 and a distance Q2 from an end of the second connecting surface 105 away from the first end face 102 to the permanent magnet mounting surface 116.

[0084] In some examples, such as Figure 1A and Figure 1C As shown, the first permanent magnet 101 further includes a fourth connection surface 107, the fourth connection surface 107 is connected to the second end surface 103, the first connection surface 104 is at least indirectly connected to the fourth connection surface 107, and the fourth connection surface 107 is arranged on a side away from the permanent magnet installation surface. Exemplarily, when the first connection surface 104 is indirectly connected to the fourth connection surface 107, the first permanent magnet 101 further includes other connection surfaces connecting the first connection surface 104 and the fourth connection surface 107.

[0085] In some examples, such as Figure 1A and Figure 1C As shown, the first permanent magnet 101 also includes a fifth connection surface 108, the fifth connection surface 108 is connected to the second end surface 103, and the fifth connection surface 108 is arranged on a side close to the permanent magnet mounting surface 116. Exemplarily, the fourth connection surface 107 and the fifth connection surface 108 can be formed by chamfering design. Exemplarily, the fourth connection surface 107 and the fifth connection surface 108 can be arc surfaces, planes, curved surfaces or any other suitable irregular surfaces.

[0086] Exemplarily, the fourth connection surface 107 and the fifth connection surface 108 can be obtained by removing material, such as chamfering. In some embodiments, the first permanent magnet 101 is annular, and the first connection surface 104, the second connection surface 105, the fourth connection surface 107 and the fifth connection surface 108 of the first permanent magnet can all be formed by chamfering.

[0087] In some examples, such as Figure 1C As shown, in the projection of the first permanent magnet 101 on the first plane, the distance in the first direction from the end of the fourth connecting surface 107 connecting the second end face 103 to the end of the fourth connecting surface 107 close to the first end face 102 is a third distance L3, and the distance in the first direction from the end of the fifth connecting surface 108 away from the second end face 103 to the end of the fifth connecting surface 108 connecting the second end face 103 is a fourth distance L4, wherein the third distance L3 is greater than the fourth distance L4. Exemplarily, the end of the fourth connecting surface 107 close to the first end face 102 is also the end of the fourth connecting surface 107 away from the second end face 103. Exemplarily, the end of the fifth connecting surface 108 away from the second end face 103 is also the end of the fifth connecting surface 108 close to the first end face 102. Exemplarily, when used for a cylindrical linear motor, the first direction is parallel to the axial direction of the cylindrical linear motor, and the first permanent magnet 101 is an axially magnetized permanent magnet, such as Figure 2 As shown, the areas prone to irreversible demagnetization at high temperatures are mainly distributed in the axially magnetized permanent magnets, and the areas prone to irreversible demagnetization of the axially magnetized permanent magnets are mainly concentrated in the corners, especially the side of the axially magnetized permanent magnets away from the permanent magnet mounting surface. Therefore, by setting the fourth connecting surface 107 and the fifth connecting surface 108, and making the third distance L3 greater than the fourth distance L4, the areas prone to demagnetization can be effectively removed, greatly reducing the risk of irreversible demagnetization of the axially magnetized permanent magnets, thereby reducing the thrust fluctuation of the linear motor, and will not affect the magnetism of the first permanent magnet 101 too much. Exemplarily, the first distance L1 is equal to the third distance L3, and the second distance L2 is equal to the fourth distance L4. Exemplarily, the third connecting surface 106 connects the second connecting surface 105 and the fifth connecting surface 108. Exemplarily, the end of the fifth connecting surface 108 away from the second end surface 103 is the end of the fifth connecting surface 108 connected to the third connecting surface 106.

[0088] In some examples, in the projection of the first permanent magnet 101 on the first plane, a distance M3 from an end of the fourth connecting surface 107 away from the second end surface 103 to the permanent magnet mounting surface 116 is the maximum distance from the fourth connecting surface 107 to the permanent magnet mounting surface 116 .

[0089] In some examples, in the projection of the first permanent magnet 101 on the first plane, a distance Q3 from one end of the fifth connecting surface 108 connecting the second end surface 103 to the permanent magnet mounting surface 116 is the maximum distance from the fifth connecting surface 108 to the permanent magnet mounting surface 116 .

[0090] In some examples, in the projection of the first permanent magnet 101 on the first plane, in the first direction, a distance H3 from one end of the fourth connecting surface 107 connecting the second end surface 103 to the first end surface 102 is the maximum distance from the fourth connecting surface 107 to the first end surface 102 .

[0091] In some examples, in the projection of the first permanent magnet 101 on the first plane, in the first direction, a distance H4 from one end of the fifth connecting surface 108 connecting the second end surface 103 to the first end surface 102 is a maximum distance from the fifth connecting surface 108 to the first end surface 102 .

[0092] In some examples, in the projection of the first permanent magnet 101 on the first plane, a distance M4 from one end of the fourth connecting surface 107 connecting the second end surface 103 to the permanent magnet mounting surface 116 is the minimum distance from the fourth connecting surface 107 to the permanent magnet mounting surface 116 .

[0093] In some examples, in the projection of the first permanent magnet 101 on the first plane, a distance Q4 from the end of the fifth connecting surface 108 away from the second end surface 103 to the permanent magnet mounting surface 116 is the minimum distance from the fifth connecting surface 108 to the permanent magnet mounting surface 116. Exemplarily, when the first permanent magnet 101 is in close contact with the permanent magnet mounting surface 116, Q4 is zero.

[0094] In some examples, the maximum distances between the first connection surface 104 and the fourth connection surface 107 and the permanent magnet mounting surface 116 are the same, and the minimum distances between the first connection surface 104 and the fourth connection surface 107 and the permanent magnet mounting surface 116 are the same. Exemplarily, when the first permanent magnet 101 is chamfered to form the first connection surface 104 and the fourth connection surface 107, the specific process parameters of the chamfering design should be kept the same to form the same size of the chamfering range.

[0095] In some examples, the maximum distances between the second connection surface 105 and the fifth connection surface 108 and the permanent magnet mounting surface 116 are the same, and the minimum distances between the second connection surface 105 and the fifth connection surface 108 and the permanent magnet mounting surface 116 are the same. Exemplarily, when the first permanent magnet 101 is chamfered to form the second connection surface 105 and the fifth connection surface 108, the specific process parameters of the chamfering design should be kept the same to form the same size of the chamfering range.

[0096] In some examples, the first connecting surface 104 is an arc surface, the second connecting surface 105 is an arc surface, and the projections of the first connecting surface 104 and the second connecting surface 105 on the first plane are respectively the first arc curve and the second arc curve, and the radius of the first arc curve is greater than the radius of the second arc curve.

[0097] In some examples, the first connecting surface 104 is a plane, the second connecting surface 105 is a plane, and the projections of the first connecting surface 104 and the second connecting surface 105 on the first plane are respectively a first oblique line and a second oblique line, and the length of the first oblique line is greater than the length of the second oblique line.

[0098] In some examples, the first connecting surface 104 and the fourth connecting surface 107 are both arc surfaces, and the projections of the first connecting surface 104 and the fourth connecting surface 107 on the first plane are respectively the first arc curve and the second arc curve, and the second connecting surface 105 and the fifth connecting surface 108 are both arc surfaces, and the projections of the second connecting surface 105 and the fifth connecting surface 108 on the first plane are respectively the third arc curve and the fourth arc curve.

[0099] In some examples, the radius of the first arc curve and the second arc curve are the same, both are the first radius, the radius of the third arc curve and the fourth arc curve are the same, both are the second radius, and the first radius is greater than the second radius. Exemplarily, the second radius can be 0. When the second radius is 0, the second connecting surface 105 and the fifth connecting surface 108 do not exist. For example, the third connecting surface 106 can connect the first end surface 102 and the second end surface 103. Exemplarily, when used for a cylindrical linear motor, the first direction is parallel to the axial direction of the cylindrical linear motor, and the first permanent magnet 101 is an axially magnetized permanent magnet, such as Figure 2 As shown, the areas prone to irreversible demagnetization at high temperatures are mainly distributed in the axially magnetized permanent magnets, and the areas prone to irreversible demagnetization of the axially magnetized permanent magnets are mainly concentrated in the corners, especially on the side of the axially magnetized permanent magnets away from the permanent magnet mounting surface. Therefore, a first connecting surface 104 and a fourth connecting surface 107 are formed by chamfering the side of the axially magnetized permanent magnets away from the permanent magnet mounting surface 116, and a second connecting surface 105 and a fifth connecting surface 108 are formed by chamfering the side of the axially magnetized permanent magnets close to the permanent magnet mounting surface 116, and the first radius is made larger than the second radius, so that the areas prone to demagnetization can be effectively removed, the risk of irreversible demagnetization of the axially magnetized permanent magnets is greatly reduced, and the thrust fluctuation of the linear motor is reduced without excessively affecting the magnetism of the first permanent magnet 101.

[0100] In some examples, the thickness of the first permanent magnet 101 in the first direction is a first thickness, and the first radius is less than half of the first thickness. When the first radius is less than half of the first thickness, the first connecting surface 104 and the fourth connecting surface 107 are indirectly connected.

[0101] In some examples, the thickness of the first permanent magnet 101 in the first direction is the first thickness, the first radius is equal to half of the first thickness, and when the first radius is equal to half of the first thickness, the first connecting surface 104 is directly connected to the fourth connecting surface 107. Exemplarily, the first radius should not be too large, as an excessively large first radius will result in a significant reduction in the magnetism of the first permanent magnet 101.

[0102] In some examples, such as Figure 1A As shown, the secondary assembly for the linear motor also includes a second permanent magnet 109, the magnetization direction of the second permanent magnet 109 is a second direction, the second direction is perpendicular to the magnetization direction of the first permanent magnet 101, the magnetization direction of the first permanent magnet 101 is parallel to the first direction, the second permanent magnet 109 is arranged on the permanent magnet mounting surface 116, and the first permanent magnet 101 and the second permanent magnet 109 are arranged alternately along the first direction. Exemplarily, the first direction is perpendicular to the second direction. Exemplarily, the second permanent magnet 109 can be arranged on the permanent magnet mounting surface 116 by bonding or other suitable methods. Exemplarily, the first permanent magnet 101 and the second permanent magnet 109 are alternately arranged along the first direction. The first permanent magnet 101 and the second permanent magnet 109 may be alternately arranged one by one, or multiple first permanent magnets 101 and one second permanent magnet 109 may be alternately arranged, or one first permanent magnet 101 and multiple second permanent magnets 109 may be alternately arranged, or multiple first permanent magnets 101 and multiple second permanent magnets 109 may be alternately arranged. Exemplarily, the first permanent magnet 101 and the second permanent magnet 109 are alternately arranged in the axial direction in a Halbach array. The Halbach array is a special arrangement of permanent magnets, which can be regarded as a combination of a radial array and a tangential array (also referred to as an axial array in this application). The permanent magnet structure of the Halbach array has a strong unilateral magnetic concentration ability, which can greatly increase the magnetic field strength, thereby increasing the thrust output of the linear motor.

[0103] In some examples, such as Figure 1A and Figure 1D As shown, the second permanent magnet 109 includes a third end face 110 and a fourth end face 111 which are sequentially arranged in a spaced relationship along the first direction, and a sixth connecting face 112 connecting the third end face 110 and the fourth end face 111, and the sixth connecting face is arranged on a side away from the permanent magnet mounting face 116. Exemplarily, the third end face 110 and the fourth end face 111 are perpendicular to the first direction.

[0104] In some examples, such as Figure 1A and Figure 1D As shown, the sixth connection surface 112 includes a first sub-connection surface 1121 , and the first sub-connection surface 1121 is connected to the third end surface 110 .

[0105] In some examples, in the projection of the second permanent magnet 109 on the first plane, the distance in the first direction from one end of the first sub-connecting surface 1121 connecting the third end face 110 to one end of the first sub-connecting surface 1121 close to the fourth end face 111 is a fifth distance L5, and the first distance L1 is greater than the fifth distance L5. Exemplarily, the first sub-connecting surface 1121 can be formed by a chamfer design. Exemplarily, the first sub-connecting surface 1121 can be an arc surface, a plane, a curved surface, or any other suitable irregular surface. Exemplarily, when used in a cylindrical linear motor, the magnetizing direction of the first permanent magnet 101 is parallel to the axial direction of the cylindrical linear motor, the first permanent magnet 101 is an axially magnetized permanent magnet, the second permanent magnet 109 is a radially magnetized permanent magnet, the second permanent magnet 109 has a higher anti-demagnetization ability than the first permanent magnet 101, and combined with Figure 2 As shown, the area prone to irreversible demagnetization at high temperature is mainly distributed in the axially magnetized permanent magnets, and less distributed in the radially magnetized permanent magnets, so when the first sub-connecting surface 1121 and the first connecting surface 104 are formed, the first distance L1 can be made greater than the fifth distance L5. For example, when the first connecting surface 104 and the first sub-connecting surface 1121 are both chamfered surfaces, the first connecting surface 104 has a larger chamfer than the first sub-connecting surface 1121. For another example, when the first connecting surface 104 and the first sub-connecting surface 1121 are formed by other processes for removing materials, the formation of the first connecting surface 104 requires the removal of more materials, while the formation of the first sub-connecting surface 1121 requires the removal of less materials. Exemplarily, the end of the first sub-connecting surface 1121 close to the fourth end surface 111 is also the end of the first sub-connecting surface 1121 away from the third end surface 110.

[0106] In some examples, in the projection of the second permanent magnet 109 on the first plane, a distance M5 from an end of the first sub-connection surface 1121 close to the fourth end surface 111 to the permanent magnet mounting surface 116 is the maximum distance from the first sub-connection surface 1121 to the permanent magnet mounting surface 116 .

[0107] In some examples, a distance M6 from the end of the first sub-connection surface 1121 connected to the third end surface 110 to the permanent magnet installation surface 116 is the minimum distance from the first sub-connection surface 1121 to the permanent magnet installation surface 116 .

[0108] In some examples, in the projection of the second permanent magnet 109 on the first plane, in the first direction, a distance H5 from one end of the first sub-connecting surface 1121 connecting the third end surface 110 to the fourth end surface 111 is the maximum distance from the first sub-connecting surface 1121 to the fourth end surface 111 .

[0109] In some examples, such as Figure 1A and Figure 1DAs shown, the sixth connection surface 112 also includes a second sub-connection surface 1122 and a third sub-connection surface 1123, the first sub-connection surface 1121 connects the third end surface 110 and the second sub-connection surface 1122, the third sub-connection surface 1123 connects the fourth end surface 111 and the second sub-connection surface 1122, and the second sub-connection surface 1122 is parallel to the permanent magnet mounting surface 116. Exemplarily, the third sub-connection surface 1123 can be formed by chamfering design. Exemplarily, the third sub-connection surface 1123 can be an arc surface, a plane, a curved surface or any other suitable irregular surface. Exemplarily, one end of the first sub-connection surface 1121 connecting the second sub-connection surface 1122 is also the end of the first sub-connection surface 1121 close to the fourth end surface 111.

[0110] Exemplarily, the first sub-connection surface 1121 and the third sub-connection surface 1123 can be obtained by removing material, such as chamfering. In some embodiments, the second permanent magnet 109 is annular, and the first sub-connection surface 1121 and the third sub-connection surface 1123 of the second permanent magnet 109 can be formed by chamfering.

[0111] Exemplarily, in the projection of the second permanent magnet 109 on the first plane, the distance M7 from one end of the third sub-connection surface 1123 connecting the second sub-connection surface 1122 to the permanent magnet mounting surface 116 is the maximum distance from the third sub-connection surface 1123 to the permanent magnet mounting surface 116, and the distance M8 from one end of the third sub-connection surface 1123 connecting the fourth end surface 111 to the permanent magnet mounting surface 116 is the minimum distance from the third sub-connection surface 1123 to the permanent magnet mounting surface 116. Exemplarily, the end of the third sub-connection surface 1123 connecting the second sub-connection surface 1122 is the end of the third sub-connection surface close to the third end surface 110. Exemplarily, the end of the third sub-connection surface 1123 connecting the second sub-connection surface 1122 is the end of the third sub-connection surface away from the fourth end surface 111.

[0112] In some examples, in the projection of the second permanent magnet 109 on the first plane, in the first direction, a distance H6 from one end of the third sub-connecting surface 1123 connecting the fourth end surface 111 to the third end surface 110 is the maximum distance from the third sub-connecting surface 1123 to the third end surface 110 .

[0113] Exemplarily, the third sub-connection surface 1123 and the first sub-connection surface 1121 have the same maximum distance from the permanent magnet mounting surface 116, and the third sub-connection surface 1123 and the first sub-connection surface 1121 have the same minimum distance from the permanent magnet mounting surface 116. Exemplarily, when the first permanent magnet 101 is chamfered to form the third sub-connection surface 1123 and the first sub-connection surface 1121, the specific process parameters of the chamfering design should be kept the same to form a chamfering range of the same size.

[0114] In some examples, such as Figure 1D As shown, in the projection of the second permanent magnet 109 on the first plane, the distance in the first direction from one end of the third sub-connection surface 1123 connecting the fourth end surface 111 to one end of the third sub-connection surface 1123 connecting the second sub-connection surface 1122 is a sixth distance L6, and the sixth distance L6 is less than the third distance L3. Exemplarily, when used in a cylindrical linear motor, the magnetizing direction of the first permanent magnet 101 is parallel to the axial direction of the cylindrical linear motor, the first permanent magnet 101 is an axially magnetized permanent magnet, and the second permanent magnet 109 is a radially magnetized permanent magnet. The second permanent magnet 109 has a higher anti-demagnetization ability than the first permanent magnet 101, and combined with Figure 2 As shown, the area prone to irreversible demagnetization at high temperature is mainly distributed in the axially magnetized permanent magnets, and less distributed in the radially magnetized permanent magnets, so the sixth distance L6 can be made smaller than the third distance L3 when forming the third sub-connection surface 1123 and the fourth connection surface 107. Exemplarily, the fifth distance L5 is equal to the sixth distance L6.

[0115] In some examples, the first connecting surface 104 is an arc surface, the projection of the first connecting surface 104 on the first plane is a first arc curve, and the radius of the first arc curve is recorded as the first radius; the first sub-connecting surface 1121 is an arc surface, the projection of the first sub-connecting surface 1121 on the first plane is a fifth arc curve, the radius of the fifth arc curve is recorded as the third radius, and the third radius is smaller than the first radius. Exemplarily, when used in a cylindrical linear motor, the magnetizing direction of the first permanent magnet 101 is parallel to the axial direction of the cylindrical linear motor, the first permanent magnet 101 is an axially magnetized permanent magnet, the second permanent magnet 109 is a radially magnetized permanent magnet, the second permanent magnet 109 has a higher anti-demagnetization ability than the first permanent magnet 101, and combined with Figure 2 As shown, the area prone to irreversible demagnetization at high temperature is mainly distributed in the axially magnetized permanent magnets, and less distributed in the radially magnetized permanent magnets, so the radius of the first sub-connecting surface 1121 of the second permanent magnet 109 can be smaller than the radius of the first connecting surface 104 of the first permanent magnet 101, that is, the third radius is smaller than the first radius.

[0116] In some examples, the permanent magnet fixing plate 115 is an annular plate, and the permanent magnet mounting surface 116 is an inner wall surface of the permanent magnet fixing plate 115. Exemplarily, the permanent magnet fixing plate 115 can be a complete annular plate, or can be formed by splicing a plurality of annular plates.

[0117] In some examples, the first direction is parallel to the axial direction of the permanent magnet fixing plate 115 , and the second direction is parallel to the radial direction of the permanent magnet fixing plate 115 .

[0118] In some examples, the first permanent magnet 101 is formed by splicing a plurality of sector-shaped magnetic steel blocks.

[0119] In some examples, such as Figure 1F As shown, the second permanent magnet 109 is formed by splicing a plurality of sector-shaped magnetic steel blocks.

[0120] In some examples, the thickness of the second permanent magnet 109 in the first direction is the second thickness, and the first thickness is greater than the second thickness. Figure 2 As shown, when used in a cylindrical linear motor, the magnetizing direction of the first permanent magnet 101 is parallel to the axial direction of the cylindrical linear motor, the first permanent magnet 101 is an axially magnetized permanent magnet, and the second permanent magnet 109 is a radially magnetized permanent magnet. The area prone to irreversible demagnetization at high temperature is mainly distributed in the axially magnetized permanent magnet, and increasing the thickness of the permanent magnet can effectively reduce the risk of irreversible demagnetization of the permanent magnet. Therefore, the middle area of ​​the axially magnetized permanent magnet is thickened, so that the thickness of the first permanent magnet 101 in the first direction is greater than the thickness of the second permanent magnet 109 in the first direction, that is, the first thickness is greater than the second thickness.

[0121] In summary, by setting a first connection surface on the side away from the permanent magnet mounting surface of the first permanent magnet of the secondary assembly for the linear motor, and setting a second connection surface on the side close to the permanent magnet mounting surface of the first permanent magnet, and in the projection of the first permanent magnet on the first plane, the distance in the first direction from the end of the first connection surface connecting the first end surface to the end of the first connection surface away from the first end surface is the first distance, and the distance in the first direction from the end of the second connection surface connecting the first end surface to the end of the second connection surface away from the first end surface is the second distance, and the first distance is greater than the second distance, the easy demagnetization area of ​​the permanent magnet is effectively removed, the risk of irreversible demagnetization of the permanent magnet is reduced, and the thrust fluctuation of the linear motor is reduced. Exemplarily, a fourth connection surface is also set on the side of the first permanent magnet away from the permanent magnet mounting surface, and a fifth connection surface is set on the side of the first permanent magnet close to the permanent magnet mounting surface, further removing the easy demagnetization area of ​​the permanent magnet. Exemplarily, a first sub-connection surface and a third sub-connection surface are also set on the side of the second permanent magnet away from the permanent magnet mounting surface, further removing the easy demagnetization area of ​​the permanent magnet.

[0122] The embodiment of the present application further provides a linear motor, including the above-mentioned secondary assembly for the linear motor. Exemplarily, the description of the secondary assembly for the linear motor refers to the above description, which will not be repeated here.

[0123] In some examples, such as Figure 1EAs shown, the linear motor also includes a primary component, including a cylindrical stator core 113 and a winding 114 arranged on the stator core 113, wherein the secondary component is sleeved outside the primary component; the secondary component is configured to be able to move in a first direction relative to the primary component. Exemplarily, the stator core is cylindrical, the permanent magnet fixing plate 115 is a circular ring plate, the permanent magnet mounting surface 116 is the inner wall surface of the circular ring plate, and the permanent magnet fixing plate 115 and the permanent magnet are sleeved together on the stator core. Exemplarily, the first direction is along the axial direction of the stator core, that is, the axial magnetization direction. Exemplarily, the first connecting surface 104, the fourth connecting surface 107, the first sub-connecting surface 1121, the second sub-connecting surface 1122 and the third sub-connecting surface 1123 are arranged on a side close to the stator core 113, and the second connecting surface 105, the third connecting surface 106 and the fifth connecting surface 108 are arranged on a side away from the stator core 113.

[0124] In some examples, the stator core 113 includes a cylindrical stator yoke and a plurality of annular stator teeth disposed on the outer circumference of the stator yoke, the plurality of stator teeth are spaced apart in the axial direction, the winding 114 is disposed in the receiving slots between adjacent stator teeth, the secondary component is disposed outside the primary component and surrounds the outer circumference of the primary component, and an air gap is provided between the secondary component and the primary component. In some examples, the winding 114 may be a three-phase pancake winding of U phase, V phase, and W phase, disposed in the slot of the stator core 113, the winding 114 adopts a double-layer winding distribution, and its winding distribution coefficient is low to ensure that its back electromotive force waveform is closer to a sine wave.

[0125] It is worth mentioning that, under the premise of no contradiction, the linear motor of the present application can also be a primary component located outside the outer peripheral surface of the secondary component. In this case, although the positions of the primary component and the secondary component change, the working principle remains unchanged and the same technical effect can be achieved. The linear motor of the present application mainly takes the case where the secondary component is located outside the primary component as an example. For example, the cylindrical stator core 113 can also have a center hole in the first direction, and the stator core shaft can be set in the center hole. In other embodiments, the stator core 113 can also be a solid cylinder.

[0126] In some examples, the secondary component also includes a sliding bearing (not shown). There may be two sliding bearings, which are fixed to the permanent magnet fixing plate at both ends of the secondary component, so that the air gap between the primary component and the secondary component is evenly distributed, thereby ensuring the effective magnetic flux area and the coaxiality between the components.

[0127] In some examples, such as Figure 1E As shown, the primary component and the secondary component need to be manufactured in different lengths to ensure that the coupling between the primary component and the secondary component remains unchanged within the required stroke range. Figure 1EThe length of the primary assembly shown is greater than the length of the secondary assembly. In other embodiments, the length of the primary assembly may be smaller than the length of the secondary assembly, and the present invention does not impose any limitation on this.

[0128] In some examples, in order to increase the material stability of the first permanent magnet 101 and the second permanent magnet 109, a permanent magnet material with high intrinsic coercivity can be selected. Preferably, the first permanent magnet 101 and the second permanent magnet 109 can be made of EH type neodymium iron boron magnetic steel material.

[0129] In some examples, when the winding in the primary component is connected to alternating current, a traveling wave magnetic field is generated in the air gap. The permanent magnet of the secondary component will induce an electromotive force and generate a current under the cutting of the traveling wave magnetic field. The current interacts with the magnetic field in the air gap to generate an electromagnetic thrust. If the primary component is fixed, the secondary component moves linearly under the thrust. If the secondary component is fixed, the primary component moves linearly. During the linear motion process, the high load generated by the winding when it is overloaded and the mechanical friction generated by other components during movement will generate a large amount of heat, which will cause a significant increase in the temperature of the inner cylinder of the linear motor and eddy current heating of the permanent magnet itself. When the internal ambient temperature of the motor is higher than the temperature resistance level of the permanent magnet, the magnetic flux density of the permanent magnet will drop sharply, causing uneven magnetic density during the operation of the linear motor, which will cause a large fluctuation in the thrust of the linear motor. Therefore, by setting a chamfer on at least one corner of at least part of the permanent magnet, the demagnetization area can be effectively removed, thereby reducing the thrust fluctuation of the linear motor.

[0130] In summary, the linear motor of the present invention is provided with a first connection surface on the side away from the permanent magnet mounting surface of the first permanent magnet of the secondary assembly for the linear motor, and a second connection surface is provided on the side close to the permanent magnet mounting surface of the first permanent magnet, and in the projection of the first permanent magnet on the first plane, the distance in the first direction from the end of the first connection surface connecting the first end surface to the end of the first connection surface away from the first end surface is the first distance, and the distance in the first direction from the end of the second connection surface connecting the first end surface to the end of the second connection surface away from the first end surface is the second distance, and the first distance is greater than the second distance, which effectively removes the easy demagnetization area of ​​the permanent magnet, reduces the risk of irreversible demagnetization of the permanent magnet, and further reduces the thrust fluctuation of the linear motor. Exemplarily, a fourth connection surface is also provided on the side away from the permanent magnet mounting surface of the first permanent magnet, and a fifth connection surface is provided on the side close to the permanent magnet mounting surface of the first permanent magnet, so as to further remove the easy demagnetization area of ​​the permanent magnet. Exemplarily, a first sub-connection surface and a third sub-connection surface are also provided on the side away from the permanent magnet mounting surface of the second permanent magnet, so as to further remove the easy demagnetization area of ​​the permanent magnet.

[0131] An embodiment of the present application further provides an electromagnetic suspension, which includes the above-mentioned linear motor.

[0132] When a linear motor is used for suspension, its response speed is extremely fast, but the thrust requirement for the linear motor is high, which leads to a large current being passed through, which can easily lead to the problem of over-high temperature of the primary components. The design of the linear motor in this application can solve this problem well.

[0133] An embodiment of the present application also provides a vehicle, which includes the above-mentioned linear motor.

[0134] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present invention thereto. Various changes and modifications may be made therein by one of ordinary skill in the art without departing from the scope and spirit of the present invention. All such changes and modifications are intended to be included within the scope of the present invention as required by the appended claims.

[0135] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising a number of different elements and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

[0136] The above is only a specific embodiment or description of a specific embodiment of the present invention, and the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A secondary assembly for a linear motor, characterized in that: include: A first permanent magnet (101); A permanent magnet fixing plate (115), the permanent magnet fixing plate (115) having a permanent magnet mounting surface (116), the first permanent magnet (101) being arranged on the permanent magnet mounting surface (116); The first permanent magnet (101) comprises a first end face (102) and a second end face (103) which are arranged in sequence and spaced apart along a first direction, and a first connecting face (104) connecting the first end face (102) and the second end face (103), wherein the first connecting face (104) is arranged on a side away from the permanent magnet mounting face (116); The first permanent magnet (101) further comprises a second connecting surface (105) connecting the first end surface (102) and the second end surface (103), and the second connecting surface (105) is arranged on a side close to the permanent magnet mounting surface (116); In the projection of the first permanent magnet (101) on the first plane, the distance in the first direction from one end of the first connecting surface (104) connecting the first end surface (102) to one end of the first connecting surface (104) close to the second end surface (103) is a first distance (L1), and the distance in the first direction from one end of the second connecting surface (105) connecting the first end surface (102) to one end of the second connecting surface (105) close to the second end surface (103) is a second distance (L2), and the first distance (L1) is greater than the second distance (L2); Wherein, the first plane is perpendicular to the permanent magnet installation surface and parallel to the first direction.

2. The secondary assembly according to claim 1, characterized in that In the projection of the first permanent magnet (101) on the first plane, a distance (M1) from one end of the first connecting surface (104) close to the second end surface (103) to the permanent magnet mounting surface (116) is a maximum distance from the first connecting surface (104) to the permanent magnet mounting surface (116); In the projection of the first permanent magnet (101) on the first plane, the distance (Q1) from one end of the second connecting surface (105) connecting the first end surface (102) to the permanent magnet mounting surface (116) is the maximum distance from the second connecting surface (105) to the permanent magnet mounting surface (116); In the projection of the first permanent magnet (101) on the first plane, in the first direction, the distance (H1) from one end of the first connecting surface (104) connecting the first end surface (102) to the second end surface (103) is the maximum distance from the first connecting surface (104) to the second end surface (103); In the projection of the first permanent magnet (101) on the first plane, in the first direction, the distance (H2) from one end of the second connecting surface (105) connecting the first end surface (102) to the second end surface (103) is the maximum distance from the second connecting surface (105) to the second end surface (103).

3. The secondary assembly according to claim 1, characterized in that The first permanent magnet (101) further comprises a third connecting surface (106), wherein the third connecting surface (106) is connected to the second connecting surface (105), and the third connecting surface (106) is arranged on a side close to the permanent magnet mounting surface (116), and the third connecting surface (106) is parallel to the permanent magnet mounting surface (116).

4. The secondary assembly according to claim 1, characterized in that In the projection of the first permanent magnet (101) on the first plane, the distance (M2) from one end of the first connecting surface (104) connecting the first end surface (102) to the permanent magnet mounting surface (116) is the minimum distance from the first connecting surface (104) to the permanent magnet mounting surface (116).

5. The secondary assembly according to claim 1, characterized in that In the projection of the first permanent magnet (101) on the first plane, a distance (Q2) from an end of the second connecting surface (105) away from the first end surface (102) to the permanent magnet mounting surface (116) is the minimum distance from the second connecting surface (105) to the permanent magnet mounting surface (116).

6. The secondary assembly according to claim 1, characterized in that In the projection of the first permanent magnet (101) on the first plane, the difference between the distance (M1) from one end of the first connecting surface (104) close to the second end surface (103) to the permanent magnet mounting surface (116) and the distance (M2) from one end of the first connecting surface (104) connected to the first end surface (102) to the permanent magnet mounting surface (116) is greater than the difference between the distance (Q1) from one end of the second connecting surface (105) connected to the first end surface (102) to the permanent magnet mounting surface (116) and the distance (Q2) from one end of the second connecting surface (105) far from the first end surface (102) to the permanent magnet mounting surface (116).

7. The secondary assembly according to claim 1, characterized in that The first permanent magnet (101) further comprises a fourth connecting surface (107), the fourth connecting surface (107) being connected to the second end surface (103), the first connecting surface (104) and the fourth connecting surface (107) being at least indirectly connected, and the fourth connecting surface (107) being arranged on a side away from the permanent magnet mounting surface (116); The first permanent magnet (101) further comprises a fifth connecting surface (108), the fifth connecting surface (108) being connected to the second end surface (103), the fifth connecting surface (108) being at least indirectly connected to the second connecting surface (105), and the fifth connecting surface (108) being arranged on a side close to the permanent magnet mounting surface (116); In the projection of the first permanent magnet (101) on the first plane, the distance in the first direction from one end of the fourth connecting surface (107) connected to the second end surface (103) to one end of the fourth connecting surface (107) close to the first end surface (102) is a third distance (L3), and the distance in the first direction from one end of the fifth connecting surface (108) away from the second end surface (103) to one end of the fifth connecting surface (108) connected to the second end surface (103) is a fourth distance (L4), and the third distance (L3) is greater than the fourth distance (L4); In the projection of the first permanent magnet (101) on the first plane, a distance (M3) from one end of the fourth connecting surface (107) close to the first end surface (102) to the permanent magnet mounting surface (116) is the maximum distance from the fourth connecting surface (107) to the permanent magnet mounting surface (116); In the projection of the first permanent magnet (101) on the first plane, the distance (Q3) from one end of the fifth connecting surface (108) connected to the second end surface (103) to the permanent magnet mounting surface (116) is the maximum distance from the fifth connecting surface (108) to the permanent magnet mounting surface (116); In the projection of the first permanent magnet (101) on the first plane, in the first direction, the distance (H3) from one end of the fourth connecting surface (107) connecting the second end surface (103) to the first end surface (102) is the maximum distance from the fourth connecting surface (107) to the first end surface (102); In the projection of the first permanent magnet (101) on the first plane, in the first direction, the distance (H4) from one end of the fifth connecting surface (108) connecting the second end surface (103) to the first end surface (102) is the maximum distance from the fifth connecting surface (108) to the first end surface (102).

8. The secondary assembly according to claim 7, characterized in that The maximum distances between the first connecting surface (104) and the fourth connecting surface (107) and the permanent magnet mounting surface (116) are the same, and the minimum distances between the first connecting surface (104) and the fourth connecting surface (107) and the permanent magnet mounting surface (116) are the same.

9. The secondary assembly according to claim 7, characterized in that The maximum distances between the second connecting surface (105) and the fifth connecting surface (108) and the permanent magnet mounting surface (116) are the same, and the minimum distances between the second connecting surface (105) and the fifth connecting surface (108) and the permanent magnet mounting surface (116) are the same.

10. The secondary assembly according to claim 1, characterized in that The first connecting surface (104) is an arc surface, and the second connecting surface (105) is an arc surface. The projections of the first connecting surface (104) and the second connecting surface (105) on the first plane are respectively a first arc curve and a second arc curve, and the radius of the first arc curve is greater than the radius of the second arc curve.

11. The secondary assembly according to claim 1, characterized in that The first connecting surface (104) is a plane, the second connecting surface (105) is a plane, the projections of the first connecting surface (104) and the second connecting surface (105) on the first plane are respectively a first oblique line and a second oblique line, and the length of the first oblique line is greater than the length of the second oblique line.

12. The secondary assembly according to claim 7, characterized in that The first connecting surface (104) and the fourth connecting surface (107) are both arc surfaces, and the projections of the first connecting surface (104) and the fourth connecting surface (107) on the first plane are respectively the first arc curve and the second arc curve; the second connecting surface (105) and the fifth connecting surface (108) are both arc surfaces, and the projections of the second connecting surface (105) and the fifth connecting surface (108) on the first plane are respectively the third arc curve and the fourth arc curve.

13. The secondary assembly according to claim 12, characterized in that The radii of the first arc curve and the second arc curve are the same, both are the first radius, the radii of the third arc curve and the fourth arc curve are the same, both are the second radius, and the first radius is greater than the second radius.

14. The secondary assembly according to claim 7, characterized in that The first connecting surface (104) and the fourth connecting surface (107) are both arc surfaces, the projections of the first connecting surface (104) and the fourth connecting surface (107) on the first plane are respectively a first arc curve and a second arc curve, and the radii of the first arc curve and the second arc curve are the same, both being a first radius; The thickness of the first permanent magnet (101) in the first direction is a first thickness, and the first radius is less than half of the first thickness.

15. The secondary assembly according to claim 7, characterized in that The first connecting surface (104) and the fourth connecting surface (107) are both arc surfaces, the projections of the first connecting surface (104) and the fourth connecting surface (107) on the first plane are respectively a first arc curve and a second arc curve, and the radii of the first arc curve and the second arc curve are the same, both being a first radius; The thickness of the first permanent magnet (101) in the first direction is a first thickness, the first radius is equal to half of the first thickness, and the first connecting surface (104) and the fourth connecting surface (107) are directly connected.

16. The secondary assembly according to claim 1, characterized in that Also includes: A second permanent magnet (109), wherein the magnetization direction of the second permanent magnet (109) is a second direction, the second direction is perpendicular to the magnetization direction of the first permanent magnet (101), the magnetization direction of the first permanent magnet is parallel to the first direction, the second permanent magnet (109) is arranged on the permanent magnet mounting surface, and the first permanent magnet (101) and the second permanent magnet (109) are alternately arranged along the first direction.

17. The secondary assembly according to claim 16, characterized in that The second permanent magnet (109) comprises a third end face (110) and a fourth end face (111) which are arranged in sequence and spaced apart from each other along the first direction, and a sixth connecting face (112) connecting the third end face (110) and the fourth end face (111), wherein the sixth connecting face (112) is arranged on a side away from the permanent magnet mounting face (116); The sixth connecting surface (112) comprises a first sub-connecting surface (1121), and the first sub-connecting surface (1121) is connected to the third end surface (110); In the projection of the second permanent magnet (109) on the first plane, the distance in the first direction from one end of the first sub-connection surface (1121) connected to the third end surface (110) to one end of the first sub-connection surface (1121) close to the fourth end surface (111) is a fifth distance (L5), and the first distance (L1) is greater than the fifth distance (L5); In the projection of the second permanent magnet (109) on the first plane, a distance (M5) from an end of the first sub-connection surface (1121) close to the fourth end surface (111) to the permanent magnet mounting surface (116) is the maximum distance from the first sub-connection surface (1121) to the permanent magnet mounting surface (116); In the projection of the second permanent magnet (109) on the first plane, in the first direction, the distance (H5) from one end of the first sub-connecting surface (1121) connecting the third end surface (110) to the fourth end surface (111) is the maximum distance from the first sub-connecting surface (1121) to the fourth end surface (111).

18. The secondary assembly according to claim 17, characterized in that The sixth connection surface (112) further comprises a second sub-connection surface (1122) and a third sub-connection surface (1123), the first sub-connection surface (1121) connects the third end surface (110) and the second sub-connection surface (1122), the third sub-connection surface (1123) connects the fourth end surface (111) and the second sub-connection surface (1122), and the second sub-connection surface is parallel to the permanent magnet mounting surface; In the projection of the second permanent magnet (109) on the first plane, the distance (M7) from one end of the third sub-connection surface (1123) connected to the second sub-connection surface (1122) to the permanent magnet mounting surface (116) is the maximum distance from the third sub-connection surface (1123) to the permanent magnet mounting surface (116); In the projection of the second permanent magnet (109) on the first plane, in the first direction, the distance (H6) from one end of the third sub-connection surface (1123) connected to the fourth end surface (111) to the third end surface (110) is the maximum distance from the third sub-connection surface (1123) to the third end surface (110); The third sub-connection surface (1123) and the first sub-connection surface (1121) have the same maximum distance from the permanent magnet mounting surface (116), and the third sub-connection surface (1123) and the first sub-connection surface (1121) have the same minimum distance from the permanent magnet mounting surface (116).

19. The secondary assembly according to claim 17, characterized in that The first connecting surface (104) is an arc surface, the projection of the first connecting surface (104) on the first plane is a first arc curve, and the radius of the first arc curve is recorded as a first radius; The first sub-connecting surface (1121) is an arc surface, and the projection of the first sub-connecting surface (1121) on the first plane is a fifth arc curve. The radius of the fifth arc curve is recorded as a third radius, and the third radius is smaller than the first radius.

20. The secondary assembly of claim 1, wherein: The permanent magnet fixing plate (115) is an annular plate, and the permanent magnet mounting surface (116) is an inner wall surface of the annular plate.

21. The secondary assembly of claim 1, wherein: The first permanent magnet (101) is formed by splicing a plurality of sector-shaped magnetic steel blocks.

22. A linear motor, characterized in that: include: A secondary assembly according to any one of claims 1 to 21.

23. The linear motor according to claim 22, characterized in that: Also includes: The primary component comprises a cylindrical stator core (113) and a winding (114) arranged on the stator core (113); the secondary component is sleeved outside the primary component.

24. The linear motor according to claim 23, characterized in that: The stator core (113) is cylindrical, the permanent magnet fixing plate (115) is a circular ring-shaped plate, and the permanent magnet mounting surface (116) is the inner wall surface of the circular ring-shaped plate.

25. An electromagnetic suspension, characterized in that: A linear motor comprising any one of claims 22-24.

26. A vehicle, characterized in that: Includes the linear motor as described in any one of claims 22-24, or includes the electromagnetic suspension as described in claim 25.

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