A secondary assembly for a linear motor, a linear motor, an electromagnetic suspension and a vehicle

Abstract

The application provides a secondary assembly for a linear motor, a linear motor, an electromagnetic suspension and a vehicle, comprising: a first permanent magnet, a magnetization direction of the first permanent magnet being parallel to a first direction; a permanent magnet fixing plate, the permanent magnet fixing plate having a permanent magnet mounting surface, and the first permanent magnet being arranged on the permanent magnet mounting surface; the first permanent magnet comprising a first end surface and a second end surface arranged in sequence and at intervals along the first direction, and a first connecting surface, the first connecting surface being arranged on a side away from the permanent magnet mounting surface, and the first permanent magnet further comprising a second connecting surface, the second connecting surface being arranged on a side close to the permanent magnet mounting surface. The scheme can arrange the first connecting surface and the second connecting surface on the first permanent magnet respectively, effectively removes the demagnetization area of the permanent magnet, reduces the irreversible demagnetization risk of the permanent magnet, and further reduces the thrust fluctuation of the linear motor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a secondary assembly for a linear motor, a linear motor, an electromagnetic suspension and a vehicle. BACKGROUND

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

[0003] In the related art, the winding and the permanent magnet are usually arranged on the primary assembly and the secondary assembly respectively. During the operation of the motor, the primary assembly and the secondary assembly will perform relative linear motion. Under the condition of frequent reciprocating motion, a large amount of heat will be generated in the primary assembly, which is easy to cause the permanent magnet to have serious local demagnetization due to high temperature, and further cause the thrust fluctuation of the linear motor to be large. SUMMARY

[0004] A series of simplified concepts are introduced in the summary section, which will be further described in detail in the specific embodiment section. The summary section of the present application does not mean to attempt to limit the key features and necessary technical features of the claimed technical solution, nor to attempt to determine the protection scope of the claimed technical solution.

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

[0006] A 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;

[0007] The first permanent magnet comprises a first end face and a second end face arranged in sequence and spaced apart in a first direction, and a first connecting surface connecting the first end face and the second end face, and the first connecting surface is arranged on a side away from the permanent magnet mounting surface;

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

[0009] In the projection of the first permanent magnet on the first plane, the distance between the one end of the first connecting surface connecting the first end face and the one end of the first connecting surface close to the second end face in the first direction is a first distance, and the distance between the one end of the second connecting surface connecting the first end face and the one end of the second connecting surface close to the second end face in the first direction 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 mounting surface and parallel to the first direction.

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

[0012] Exemplarily, in the projection of the first permanent magnet on the first plane, the distance from the second connecting surface to the permanent magnet mounting surface at the end close to the first end surface is the maximum distance from the second connecting surface to the permanent magnet mounting surface.

[0013] Exemplarily, in the projection of the first permanent magnet on the first plane, the distance from the first connecting surface to the second end surface at the end connecting the first end surface in the first direction is the maximum distance from the first connecting surface to the second end surface.

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

[0015] Exemplarily, the first permanent magnet further comprises a third connecting surface, the third connecting surface connects the second connecting surface, the third connecting surface is arranged on the 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 the first connecting surface to the permanent magnet mounting surface at the end connecting the first end 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 second connecting surface to the permanent magnet mounting surface at the end away from the first end 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 the first connecting surface to the permanent magnet mounting surface at the end close to the second end surface and the distance from the first connecting surface to the permanent magnet mounting surface at the end connecting the first end surface is greater than the difference between the distance from the second connecting surface to the permanent magnet mounting surface at the end connecting the first end surface and the distance from the second connecting surface to the permanent magnet mounting surface at the end away from the first end surface.

[0019] Exemplarily, the first permanent magnet further comprises a fourth connecting surface, the fourth connecting surface connects 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 comprises a fifth connecting surface, the fifth connecting surface connects 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 between the end of the fourth connecting surface connecting the second end surface and the end of the fourth connecting surface close to the first end surface in the first direction is a third distance, and the distance between the end of the fifth connecting surface away from the second end surface and the end of the fifth connecting surface connecting the second end surface in the first direction 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 between the end of the fourth connecting surface close to the first end surface and the permanent magnet mounting surface is the maximum distance between the fourth connecting surface and the permanent magnet mounting surface;

[0023] In the projection of the first permanent magnet on the first plane, the distance between the end of the fifth connecting surface connecting the second end surface and the permanent magnet mounting surface is the maximum distance between the fifth connecting surface and the permanent magnet mounting surface;

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

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

[0026] Exemplarily, the maximum distance between the first connecting surface and the fourth connecting surface and the permanent magnet mounting surface is the same, and the minimum distance between the first connecting surface and the fourth connecting surface and the permanent magnet mounting surface is the same.

[0027] Exemplarily, the maximum distance between the second connecting surface and the fifth connecting surface and the permanent magnet mounting surface is the same, and the minimum distance between the second connecting surface and the fifth connecting surface and the permanent magnet mounting surface is the same.

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

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

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

[0031] Exemplarily, the first circular arc curve and the second circular arc curve have the same radius, which is a first radius, the third circular arc curve and the fourth circular arc curve have the same radius, which is a 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 circular arc surfaces, projections of the first connecting surface and the fourth connecting surface on the first plane are respectively a first circular arc curve and a second circular arc curve, and the first circular arc curve and the second circular arc curve have the same radius, which is a first radius.

[0033] A 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 circular arc surfaces, projections of the first connecting surface and the fourth connecting surface on the first plane are respectively a first circular arc curve and a second circular arc curve, and the first circular arc curve and the second circular arc curve have the same radius, which is a first radius.

[0035] A 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 and the fourth connecting surface are directly connected.

[0036] Exemplarily, the first connecting surface and the fourth connecting surface are both circular arc surfaces, projections of the first connecting surface and the fourth connecting surface on the first plane are respectively a first circular arc curve and a second circular arc curve, and the first circular arc curve and the second circular arc curve have the same radius, which is a first radius.

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

[0038] Exemplarily, the second permanent magnet comprises a third end surface and a fourth end surface which are sequentially and spaced apart along the first direction, and a sixth connecting surface connecting the third end surface and the fourth end surface, the sixth connecting surface being disposed on a side away from the permanent magnet mounting surface;

[0039] The sixth connecting surface comprises a first sub-connecting surface, the first sub-connecting surface connecting the third end surface;

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

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

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

[0043] Exemplarily, the sixth connecting surface further comprises a second sub-connecting surface and a third sub-connecting surface, the first sub-connecting surface connecting the third end surface and the second sub-connecting surface, the third sub-connecting surface connecting the fourth end surface and the second sub-connecting surface, the second sub-connecting surface being parallel to the permanent magnet mounting surface;

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

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

[0046] The maximum distance from the permanent magnet mounting surface to the third sub-connection surface is the same as the maximum distance from the permanent magnet mounting surface to the first sub-connection surface, and the minimum distance from the permanent magnet mounting surface to the third sub-connection surface is the same as the minimum distance from the permanent magnet mounting surface to the first sub-connection surface.

[0047] Exemplarily, the first connection surface is a circular arc surface, and a projection of the first connection surface on the first plane is a first circular arc curve, and a radius of the first circular arc curve is denoted as a first radius.

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

[0049] Exemplarily, the permanent magnet fixing plate is a ring-shaped plate, and the permanent magnet mounting surface is an inner wall surface of the ring-shaped plate.

[0050] Exemplarily, the first permanent magnet is spliced by a plurality of fan-shaped ring-shaped magnetic steel blocks.

[0051] Another aspect of the present application provides a linear motor comprising the above-mentioned secondary assembly.

[0052] Exemplarily, the linear motor further comprises a primary assembly, the primary assembly comprises a cylindrical stator core and a winding arranged on the stator core, and the secondary assembly is arranged outside the primary assembly.

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

[0054] Still another aspect of the present application provides an electromagnetic suspension comprising the above-mentioned linear motor.

[0055] Still another aspect of the present application provides a vehicle comprising the above-mentioned linear motor or the above-mentioned electromagnetic suspension.

[0056] The linear motor secondary assembly, the linear motor, the electromagnetic suspension and the vehicle of the present application effectively remove the demagnetization area of the permanent magnet, reduce the irreversible demagnetization risk of the permanent magnet, and further reduce the thrust fluctuation of the linear motor, by arranging a first connection surface on a side of a first permanent magnet of the linear motor secondary assembly away from a permanent magnet mounting surface, arranging a second connection surface on a side of the first permanent magnet close to the permanent magnet mounting surface, and arranging the first connection surface to connect one end of the first end surface to one end of the second connection surface close to the second end surface in the first direction with a first distance, and arranging the second connection surface to connect one end of the first end surface to one end of the second connection surface close to the second end surface in the first direction with a second distance, and the first distance is greater than the second distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The above and other objects, features, and advantages of the present invention will become more apparent through a more detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are provided 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 are not intended to limit the present invention. In the 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 according to a specific embodiment of the present application is shown;

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

[0062] Figure 1D A cross-sectional schematic diagram of a second permanent magnet according to 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 structural diagram of a second permanent magnet according to 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 solutions and advantages of the present invention more apparent, an exemplary embodiment of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a 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 this invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention.

[0067] First refer to Figure 1A and Figure 1B To describe the secondary assembly for the linear motor according to an embodiment of the present application. Figure 1AA sectional view of a secondary assembly of a linear motor is shown in an embodiment of the present application, Figure 1B A sectional view of a first permanent magnet is shown in an embodiment of the present application.

[0068] In the related art, a linear motor generally includes a primary assembly and a secondary assembly, the primary assembly includes a core and a winding disposed on the core, the secondary assembly includes a shell and a magnetic steel disposed on the shell, and an air gap is provided between the magnetic steel and the core; when the linear motor works for a period of time, or the linear motor needs to reach a large thrust, a large current is input into the winding, which easily leads to an increase in the temperature of the winding, and the part of the magnetic steel close to the winding is more seriously affected by demagnetization due to high temperature.

[0069] After repeated tests, the demagnetization of the magnetic steel is mainly in the corner area of the magnetic steel. Therefore, the present application proposes the following technical solutions: for example, by removing the material in the corner area of the magnetic steel close to the winding, the problem of magnetic density caused by high temperature is reduced, and at the same time, in order to prevent the corner magnetic steel from being too sharp, more material is removed in the corner area of the magnetic steel close to the winding, and less material is removed away from the corner area, so that the magnetic steel is not greatly affected.

[0070] As shown in Figure 1A A secondary assembly of a linear motor includes a first permanent magnet 101 and a permanent magnet fixing plate 115. The first permanent magnet 101 is disposed on a permanent magnet mounting surface 116 of the permanent magnet fixing plate 115. The first direction is the linear motion direction of the linear motor. The first permanent magnet 101 can be disposed on the permanent magnet mounting surface 116 by adhesion or other suitable means. In some examples, as shown in Figure 1A and Figure 1B The first permanent magnet includes a first end surface 102 and a second end surface 103 disposed in sequence and spaced apart along the first direction, and a first connecting surface 104 connecting the first end surface 102 and the second end surface 103. The first connecting surface 104 is disposed on the side away from the permanent magnet mounting surface 116. The first end surface 102 and the second end surface 103 are perpendicular to the first direction. The first connecting surface 104 serves to connect the first end surface 102 and the second end surface 103, and does not mean that the first connecting surface 104 and the first end surface 102 or the second end surface 103 are directly connected, but can be indirectly connected, for example, as shown in Figure 1A and Figure 1B The first connecting surface 104 is directly connected to the first end surface 102, and indirectly connected to the second end surface 103.

[0071] In some examples, as shown in Figure 1A andFigure 1B As shown, the first permanent magnet further includes a second connecting surface 105 connecting the first end surface 102 and the second end surface 103, wherein the second connecting surface 105 is provided on a side close to the permanent magnet mounting surface 116. For example, the second connecting surface 105 serves to connect the first end surface 102 and the second end surface 103, but does not mean that the second connecting surface 105 and the first end surface 102 or the second end surface 103 are directly connected. The second connecting surface 105 and the first end surface 102 or the second end surface 103 may be indirectly connected, for example, Figure 1A and Figure 1B As shown, the second connecting surface 105 is directly connected to the first end surface 102, and the second connecting surface 105 is indirectly connected to the second end surface 103. For example, the first connecting surface 104 and the second connecting surface 105 can be formed by chamfering. For example, the first connecting surface 104 and the second connecting 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 near the second end surface 103 is a 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 near the second end surface 103 is a second distance L2, wherein the first distance L1 is greater than the second distance L2. Exemplarily, the end of the first connecting surface 104 near 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 near the second end surface 103 is also the end of the second connecting surface 105 away from the first end surface 102.

[0073] For example, 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 providing 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 excessively affect the magnetism of the first permanent magnet 101.

[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, such as the first connecting surface 104 and the second connecting surface 105 are both chamfered, such as 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 demagnetization problem caused by high temperature, thereby ensuring that the magnetic density is relatively uniform, and reducing the thrust fluctuation of the linear motor. The second connecting surface 105 is relatively far from the high temperature area, but the setting of the second connecting surface 105 can reduce the risk of scratching caused by the too sharp edge of the magnetic steel in 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, the distance M1 from the end of the first connecting surface 104 away from the first end surface 102 to the permanent magnet mounting surface 116 is the 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, the distance Q1 from the 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, the distance H1 from the 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.

[0079] In some examples, in the projection of the first permanent magnet 101 on the first plane, in the first direction, the distance H2 from the 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.

[0080] In some examples, as shown in Figure 1A As shown in Figure 1B The first permanent magnet 101 further includes a third connecting surface 106, the third connecting surface 106 connects the second connecting surface 105, the third connecting surface 106 is arranged on the side close to the permanent magnet mounting surface 116, and the third connecting surface 106 is parallel to the permanent magnet mounting surface 116. Exemplarily, the end of the second connecting surface 105 close to the second end surface 103, that is, the end of the second connecting surface 105 connecting the third connecting 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 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 between the second connecting surface 105 and 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, the difference between the distance M1 from the end of the first connecting surface 104 away from the first end surface 102 to the permanent magnet mounting surface 116 and the distance M2 from the 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 the 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 the end of the second connecting surface 105 away from the first end surface 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 connecting surface 107, which is connected to the second end surface 103. The first connecting surface 104 is at least indirectly connected to the fourth connecting surface 107, and the fourth connecting surface 107 is arranged on a side away from the permanent magnet mounting surface. Exemplarily, when the first connecting surface 104 is indirectly connected to the fourth connecting surface 107, the first permanent magnet 101 further includes other connecting surfaces connecting the first connecting surface 104 and the fourth connecting surface 107.

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

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

[0087] In some examples, as shown in FIG. 1A, the first permanent magnet 101 is an axial magnetization permanent magnet, and the first direction is parallel to the axial direction of the tubular linear motor. Figure 1C In some examples, as shown in FIG. 1A, the first permanent magnet 101 is an axial magnetization permanent magnet, and the first direction is parallel to the axial direction of the tubular linear motor. Figure 2 In some examples, as shown in FIG. 1A, the first permanent magnet 101 is an axial magnetization permanent magnet, and the first direction is parallel to the axial direction of the tubular linear motor.

[0088] In some examples, as shown in FIG. 1A, the first permanent magnet 101 is an axial magnetization permanent magnet, and the first direction is parallel to the axial direction of the tubular linear motor.

[0089] In some examples, as shown in FIG. 1A, the first permanent magnet 101 is an axial magnetization permanent magnet, and the first direction is parallel to the axial direction of the tubular linear motor.

[0090] In some examples, the fourth connecting surface 107 connects one end of the second end surface 103 to the first end surface 102 in the first direction by a distance H3 which 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.

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

[0092] In some examples, the fourth connecting surface 107 connects one end of the second end surface 103 to the permanent magnet mounting surface 116 by a distance M4 which is the minimum 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.

[0093] In some examples, the fifth connecting surface 108 connects one end of the second end surface 103 to the permanent magnet mounting surface 116 by a distance Q4 which is the minimum 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. Exemplarily, Q4 is zero when the first permanent magnet 101 is tightly attached to the permanent magnet mounting surface 116.

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

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

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

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

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

[0099] In some examples, the first circular arc curve and the second circular arc curve have the same radius, which is a first radius, the third circular arc curve and the fourth circular arc curve have the same radius, which is a second radius, and the first radius is greater than the second radius. For example, the second radius can be 0, and when the second radius is 0, the second connecting surface 105 and the fifth connecting surface 108 do not exist, and for example, the third connecting surface 106 can connect the first end surface 102 and the second end surface 103. Figure 2 As shown in FIG. 1, the area prone to irreversible demagnetization at high temperature is mainly distributed in the axial magnetization permanent magnet, and the area prone to irreversible demagnetization of the axial magnetization permanent magnet is mainly concentrated at the corners, especially on the side of the axial magnetization permanent magnet away from the permanent magnet mounting surface 116. Therefore, by chamfering the side of the axial magnetization permanent magnet away from the permanent magnet mounting surface 116 to form the first connecting surface 104 and the fourth connecting surface 107, and chamfering the side of the axial magnetization permanent magnet close to the permanent magnet mounting surface 116 to form the second connecting surface 105 and the fifth connecting surface 108, and making the first radius greater than the second radius, the area prone to demagnetization can be effectively removed, the risk of irreversible demagnetization of the axial magnetization permanent magnet is greatly reduced, and the thrust fluctuation of the linear motor is reduced, and the magnetism of the first permanent magnet 101 is not excessively affected.

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

[0101] In some examples, the thickness of the first permanent magnet 101 in the first direction is a first thickness, and the first radius is equal to half of the first thickness. When the first radius is equal to half of the first thickness, the first connecting surface 104 and the fourth connecting surface 107 are directly connected. For example, the first radius should not be too large, as an excessively large first radius may significantly reduce the magnetic properties of the first permanent magnet 101.

[0102] In some examples, such as Figure 1A As shown, the secondary assembly for the linear motor further includes a second permanent magnet 109. The magnetization direction of the second permanent magnet 109 is a second direction, which 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 disposed on the permanent magnet mounting surface 116, and the first permanent magnet 101 and the second permanent magnet 109 are alternately arranged along the first direction. Exemplarily, the first direction is perpendicular to the second direction. Exemplarily, the second permanent magnet 109 can be disposed on the permanent magnet mounting surface 116 by bonding or other suitable means. 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 axially 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 that are sequentially spaced apart along the first direction, and a sixth connecting face 112 that connects the third end face 110 and the fourth end face 111. The sixth connecting face is disposed 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 between the end of the first sub-connection surface 1121 connecting the third end surface 110 to the end of the first sub-connection surface 1121 close to the fourth end surface 111 in the first direction is a fifth distance L5, and the first distance L1 is greater than the fifth distance L5. Exemplarily, the first sub-connection surface 1121 can be formed by a chamfer design. Exemplarily, the first sub-connection surface 1121 can be a circular arc surface, a flat surface, a curved surface, or any other suitable irregular surface. Exemplarily, when used in a cylinder linear motor, the magnetization direction of the first permanent magnet 101 is parallel to the axial direction of the cylinder 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 demagnetization resistance of the second permanent magnet 109 is higher than that of the first permanent magnet 101, and in combination with the above-mentioned first distance L1 being greater than the fifth distance L5, the irreversible demagnetization of the first permanent magnet 101 can be effectively reduced. Figure 2 As shown, the area prone to irreversible demagnetization at high temperature is mainly distributed in the axially magnetized permanent magnet, and less in the radially magnetized permanent magnet, so that the first distance L1 can be greater than the fifth distance L5 when the first sub-connection surface 1121 and the first connection surface 104 are formed. For example, when the first connection surface 104 and the first sub-connection surface 1121 are both chamfer surfaces, the first connection surface 104 has a larger chamfer than the first sub-connection surface 1121. For another example, when the first connection surface 104 and the first sub-connection surface 1121 are formed by other material removal processes, the first connection surface 104 needs to remove more material, and the first sub-connection surface 1121 needs to remove less material. Exemplarily, the end of the first sub-connection surface 1121 close to the fourth end surface 111 is the end of the first sub-connection 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, the distance between the end of the first sub-connection surface 1121 close to the fourth end surface 111 to the permanent magnet mounting surface 116 is a fifth distance M5, which is the maximum distance between the first sub-connection surface 1121 and the permanent magnet mounting surface 116.

[0107] In some examples, the distance between the end of the first sub-connection surface 1121 connecting the third end surface 110 to the permanent magnet mounting surface 116 is a sixth distance M6, which is the minimum distance between the first sub-connection surface 1121 and the permanent magnet mounting surface 116.

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

[0109] In some examples, as shown in FIG. 6, the first sub-connection surface 1121 is a chamfer surface, and the first distance L1 is greater than the fifth distance L5. Figure 1A In some examples, as shown in FIG. 7, the first sub-connection surface 1121 is a chamfer surface, and the first distance L1 is greater than the fifth distance L5. Figure 1DAs shown, the sixth connecting surface 112 further comprises a second sub connecting surface 1122 and a third sub connecting surface 1123, the first sub connecting surface 1121 connects the third end surface 110 and the second sub connecting surface 1122, the third sub connecting surface 1123 connects the fourth end surface 111 and the second sub connecting surface 1122, and the second sub connecting surface 1122 is parallel to the permanent magnet mounting surface 116. Exemplarily, the third sub connecting surface 1123 can be formed by a chamfer design. Exemplarily, the third sub connecting surface 1123 can be a circular arc surface, a flat surface, a curved surface, or any other suitable irregular surface. Exemplarily, the first sub connecting surface 1121 connects one end of the second sub connecting surface 1122, i.e., the end of the first sub connecting surface 1121 close to the fourth end surface 111.

[0110] Exemplarily, the first sub connecting surface 1121 and the third sub connecting surface 1123 can be obtained by material removal, such as chamfering. In some embodiments, the second permanent magnet 109 is annular, and the first sub connecting surface 1121 and the third sub connecting 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 the end of the third sub connecting surface 1123 connecting the second sub connecting surface 1122 to the permanent magnet mounting surface 116 is the maximum distance of the third sub connecting surface 1123 to the permanent magnet mounting surface 116, and the distance M8 from the end of the third sub connecting surface 1123 connecting the fourth end surface 111 to the permanent magnet mounting surface 116 is the minimum distance of the third sub connecting surface 1123 to the permanent magnet mounting surface 116. Exemplarily, the end of the third sub connecting surface 1123 connecting the second sub connecting surface 1122 is the end of the third sub connecting surface close to the third end surface 110. Exemplarily, the end of the third sub connecting surface 1123 connecting the second sub connecting surface 1122 is the end of the third sub connecting 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, the distance H6 from the end of the third sub connecting surface 1123 connecting the fourth end surface 111 to the third end surface 110 is the maximum distance of the third sub connecting surface 1123 to the third end surface 110.

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

[0114] In some examples, as shown inFigure 1D As shown, in the projection of the second permanent magnet 109 on the first plane, the distance between the one end of the third sub-connection surface 1123 connecting the fourth end surface 111 to the one end of the second sub-connection surface 1122 connecting the third sub-connection surface 1123 in the first direction is a sixth distance L6, and the sixth distance L6 is less than the third distance L3. Exemplarily, when used in a cylinder linear motor, the magnetization direction of the first permanent magnet 101 is parallel to the axial direction of the cylinder linear motor, the first permanent magnet 101 is an axial magnetization permanent magnet, the second permanent magnet 109 is a radial magnetization permanent magnet, the demagnetization resistance of the second permanent magnet 109 is higher than that of the first permanent magnet 101, and in combination with the above-mentioned embodiments, the sixth distance L6 is less than the third distance L3. Figure 2 As shown, the area prone to irreversible demagnetization at high temperature is mainly distributed in the axial magnetization permanent magnet, and less in the radial magnetization permanent magnet, so the sixth distance L6 can be made less than the third distance L3 when the third sub-connection surface 1123 and the fourth connection surface 107 are formed. Exemplarily, the fifth distance L5 is equal to the sixth distance L6.

[0115] In some examples, the first connection surface 104 is a circular arc surface, the projection of the first connection surface 104 on the first plane is a first circular arc curve, and the radius of the first circular arc curve is denoted as a first radius; the first sub-connection surface 1121 is a circular arc surface, the projection of the first sub-connection surface 1121 on the first plane is a fifth circular arc curve, and the radius of the fifth circular arc curve is denoted as a third radius, which is less than the first radius. Exemplarily, when used in a cylinder linear motor, the magnetization direction of the first permanent magnet 101 is parallel to the axial direction of the cylinder linear motor, the first permanent magnet 101 is an axial magnetization permanent magnet, the second permanent magnet 109 is a radial magnetization permanent magnet, the demagnetization resistance of the second permanent magnet 109 is higher than that of the first permanent magnet 101, and in combination with the above-mentioned embodiments, the third radius is less than the first radius. Figure 2 As shown, the area prone to irreversible demagnetization at high temperature is mainly distributed in the axial magnetization permanent magnet, and less in the radial magnetization permanent magnet, so the radius of the first sub-connection surface 1121 of the second permanent magnet 109 can be less than the radius of the first connection surface 104 of the first permanent magnet 101, i.e., the third radius is less 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 the 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 spliced by multiple 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 spliced by multiple fan-shaped annular magnetic steel blocks.

[0119] In some examples, as shown in FIG. 1, the first permanent magnet 101 is an annular permanent magnet, and the first connection surface 104 is the outer wall surface of the first permanent magnet 101.Figure 1F As shown, the second permanent magnet 109 is spliced by a plurality of fan-shaped ring-shaped magnetic steel blocks.

[0120] In some examples, the thickness of the second permanent magnet 109 in the first direction is a second thickness, and the first thickness is greater than the second thickness. Exemplarily, as shown in FIG. 1, the thickness of the second permanent magnet 109 in the first direction is less than the thickness of the first permanent magnet 101 in the first direction. Figure 2 As shown, when used in a cylinder linear motor, the magnetization direction of the first permanent magnet 101 is parallel to the axial direction of the cylinder linear motor, the first permanent magnet 101 is an axial magnetization permanent magnet, and the second permanent magnet 109 is a radial magnetization permanent magnet. The area prone to irreversible demagnetization at high temperature is mainly distributed in the axial magnetization 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 axial magnetization 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 providing a first connecting surface on the side of the first permanent magnet of the secondary assembly for linear motor away from the permanent magnet mounting surface, and providing 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 between the first connecting surface connecting one end of the first end surface to the end of the first connecting surface away from the first end surface in the first direction is a first distance, and the distance between the second connecting surface connecting one end of the first end surface to the end of the second connecting surface away from the first end surface in the first direction is a second distance, the first distance is greater than the second distance, the 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. Exemplarily, a fourth connecting surface is further provided on the side of the first permanent magnet away from the permanent magnet mounting surface, and a fifth connecting surface is further provided 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-connecting surface and a third sub-connecting surface are further provided 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 embodiments of the present application also provide a linear motor comprising the above-mentioned secondary assembly for linear motor. Exemplarily, the description of the secondary assembly for linear motor is referred to the description in the above, which will not be repeated here.

[0123] In some examples, as shown in FIG. 1, the first permanent magnet 101 is an axial magnetization permanent magnet, and the second permanent magnet 109 is a radial magnetization permanent magnet. Figure 1EAs shown, the linear motor further includes a primary assembly, comprising a cylindrical stator core 113 and a winding 114 disposed on the stator core 113. The secondary assembly is sleeved outside the primary assembly; the secondary assembly is configured to move relative to the primary assembly in a first direction. Exemplarily, the stator core is cylindrical, the permanent magnet retaining plate 115 is an annular plate, and the permanent magnet mounting surface 116 is the inner wall surface of the annular plate. The permanent magnet retaining plate 115 and the permanent magnets are sleeved together on the stator core. Exemplarily, the first direction is along the axial direction of the stator core, i.e., 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 disposed on a side proximal to the stator core 113, while the second connecting surface 105, the third connecting surface 106, and the fifth connecting surface 108 are disposed on a side distal to 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 along the axial direction. The windings 114 are disposed in the receiving slots between adjacent stator teeth. The secondary assembly is disposed outside the primary assembly and surrounds the outer circumference of the primary assembly, with an air gap between the secondary and primary assemblies. In some examples, the windings 114 may be three-phase pancake windings (U-phase, V-phase, and W-phase), disposed in the slots of the stator core 113. The windings 114 utilize a double-layer winding distribution with a low winding distribution coefficient to ensure that the back electromotive force waveform is closer to a sine wave.

[0125] It's worth noting that, provided there's no conflict, the linear motor of this application can also have the primary assembly located outside the outer circumference of the secondary assembly. In this case, while the positions of the primary and secondary assemblies change, the operating principle remains unchanged, achieving the same technical effect. This linear motor primarily uses the case where the secondary assembly is located outside the primary assembly as an example. For example, the cylindrical stator core 113 can also have a center hole in the first direction, in which the stator core shaft can be disposed. 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 can 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, ensuring the effective magnetic flux area and the coaxiality between the components.

[0127] In some examples, such as Figure 1E As shown, the primary assembly and the secondary assembly need to be manufactured in different lengths to ensure that the coupling between the primary assembly and the secondary assembly remains unchanged within the required stroke range. Figure 1EThe primary assembly length is greater than the secondary assembly length as shown, but in other embodiments, the primary assembly length can be less than the secondary assembly length, and the present application is not limited in this respect.

[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, and preferably, the material of the first permanent magnet 101 and the second permanent magnet 109 can be EH type neodymium iron boron magnetic steel material.

[0129] In some examples, when the winding in the primary assembly is connected to alternating current, a traveling wave magnetic field is generated in the air gap, and the permanent magnet of the secondary assembly 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 electromagnetic thrust. If the primary assembly is fixed, the secondary assembly will do linear motion under the action of the thrust, and if the secondary assembly is fixed, the primary assembly will do linear motion. During the linear motion, high load generated by the winding in overload operation and mechanical friction generated by other components during the motion will generate a large amount of heat, which in turn causes the temperature of the inner cylinder of the linear motor to increase greatly and the eddy current of the permanent magnet itself to heat up. When the internal environment temperature of the motor is higher than the temperature resistance level of the permanent magnet, the magnetic flux density of the permanent magnet will decrease sharply, causing uneven magnetic density during the operation of the linear motor, and in turn causing large fluctuation of the thrust of the linear motor. Therefore, by setting the chamfer on at least one corner of at least part of the permanent magnet, the demagnetization area of the permanent magnet can be effectively removed, and in turn the fluctuation of the thrust of the linear motor can be reduced.

[0130] In summary, the linear motor of the present application effectively removes the demagnetization area of the permanent magnet by setting the first connecting surface on the side of the first permanent magnet of the secondary assembly of the linear motor away from the permanent magnet mounting surface, setting the 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 between the first connecting surface connecting one end of the first end surface to the end of the first connecting surface away from the first end surface in the first direction is the first distance, the distance between the second connecting surface connecting one end of the first end surface to the end of the second connecting surface away from the first end surface in the first direction is the second distance, and the first distance is greater than the second distance. The irreversible demagnetization risk of the permanent magnet is reduced, and in turn the fluctuation of the thrust of the linear motor is reduced. Exemplarily, a fourth connecting surface is further set on the side of the first permanent magnet away from the permanent magnet mounting surface, and a fifth connecting surface is further set on the side of the first permanent magnet close to the permanent magnet mounting surface, further removing the demagnetization area of the permanent magnet. Exemplarily, a first sub-connecting surface and a third sub-connecting surface are further set on the side of the second permanent magnet away from the permanent magnet mounting surface, further removing the demagnetization area of the permanent magnet.

[0131] The embodiment of the present application also provides an electromagnetic suspension, which comprises the linear motor described above.

[0132] When the linear motor is used for suspension, the response speed is very fast, but the thrust requirement of the linear motor is high, and then the current input is large, which is easy to cause the problem of high temperature of the primary assembly, and the design scheme of the linear motor in the application can well solve the problem.

[0133] The application further provides a vehicle comprising the linear motor.

[0134] Although example embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the example embodiments are only exemplary and are not intended to limit the scope of the present application. Those of ordinary skill in the art can make various changes and modifications without departing from the scope and spirit of the present application. All such changes and modifications are intended to be included within the scope of the present application as claimed in the appended claims.

[0135] It should be noted that the above embodiments illustrate the application rather than limit the application, and those skilled in the art can design alternative embodiments without departing from the scope and spirit of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The application can be implemented by means of both hardware and software, either individually or in combination. In a unit claim enumerating several means, the several means can be embodied by one and the same item of hardware. The use of the words first, second and third, etc. does not imply any order. These words can be understood as names.

[0136] The above is only a specific embodiment or a description of the specific embodiment of the application, and the protection scope of the application is not limited thereto, and any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the application, which should be covered within the protection scope of the application. The protection scope of the application should be subject to 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) arranged in sequence along a first direction and spaced apart from each other, 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 includes 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 a projection of the first permanent magnet (101) on the first plane, a 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 a 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); 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 the 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, 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); 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 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 includes a third connecting surface (106), the third connecting surface (106) being connected to the second connecting surface (105), the third connecting surface (106) being arranged on a side close to the permanent magnet mounting surface (116), and the third connecting surface (106) being 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, 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).

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 the 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 subassembly 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 the 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 the 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 the 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 the end of the second connecting surface (105) away from the first end surface (102) to the permanent magnet mounting surface (116).

7. The subassembly according to claim 1, characterized in that The first permanent magnet (101) further includes 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 includes 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, a 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 a 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 an 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, a 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 subassembly 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 subassembly 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 subassembly according to claim 1, wherein: The first connecting surface (104) is an arc surface, 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 subassembly 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 subassembly 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 subassembly according to claim 12, characterized in that The first arc curve and the second arc curve have the same radius, which is the first radius. The third arc curve and the fourth arc curve have the same radius, which is the second radius. The first radius is greater than the second radius.

14. The subassembly according to claim 7, wherein: 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 subassembly according to claim 7, wherein: 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 subassembly according to claim 1, wherein: 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 subassembly according to claim 16, characterized in that The second permanent magnet (109) comprises a third end face (110) and a fourth end face (111) arranged in sequence 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) includes a first sub-connecting surface (1121), and the first sub-connecting surface (1121) is connected to the third end surface (110); In a projection of the second permanent magnet (109) on the first plane, a distance in the first direction from an end of the first sub-connecting surface (1121) connected to the third end surface (110) to an end of the first sub-connecting 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 subassembly according to claim 17, characterized in that The sixth connecting surface (112) further comprises a second sub-connecting surface (1122) and a third sub-connecting surface (1123), wherein the first sub-connecting surface (1121) connects the third end surface (110) and the second sub-connecting surface (1122), the third sub-connecting surface (1123) connects the fourth end surface (111) and the second sub-connecting surface (1122), and the second sub-connecting 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-connecting surface (1123) connected to the second sub-connecting surface (1122) to the permanent magnet mounting surface (116) is the maximum distance from the third sub-connecting 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, a distance (H6) from one end of the third sub-connecting surface (1123) connected to 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); 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 subassembly according to claim 17, wherein: 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 subassembly of claim 1, wherein: The permanent magnet fixing plate (115) is an annular plate, and the permanent magnet mounting surface (116) is the inner wall surface of the annular plate.

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

22. A linear motor, characterized in that: include: A subassembly 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 on the outside of 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 plate, and the permanent magnet mounting surface (116) is the inner wall surface of the circular ring plate.

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

26. A vehicle, characterized in that: The linear motor comprises any one of claims 22 to 24, or the electromagnetic suspension comprises the electromagnetic suspension according to claim 25.

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