Stator magnetic core, stator assembly, linear motor, suspension system and vehicle

Abstract

A stator magnetic core, a stator assembly, a linear motor, a suspension system, and a vehicle. The stator magnetic core comprises: a stator tooth part and a stator yoke part. The stator tooth part comprises a plurality of first laminations stacked in the axial direction of the stator magnetic core, and the stator yoke part is formed into a winding piece or a stacking piece, the stator yoke part being connected to the stator tooth part.

Description

Stator cores, stator assemblies, linear motors, suspension systems, and vehicles

[0001] This application claims priority to Chinese patent application No. 202311872248.2 filed on December 29, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present disclosure relates to the technical field of motors, and in particular to a stator core, a stator assembly, a linear motor, a suspension system, and a vehicle. Background Art

[0003] A linear motor is a mechanical device that converts electrical energy directly into linear motion. Widely used in urban rail transit systems such as high-speed maglev trains, subways, and light rail, linear motors provide efficient and smooth linear motion. Linear motors offer advantages such as direct drive, simple structure, and easy maintenance. Summary of the Invention

[0004] The present disclosure aims to solve at least one of the technical problems existing in the related art. To this end, the present disclosure proposes a stator core that can significantly reduce eddy current losses in the stator core, thereby improving the thrust and efficiency of the linear motor.

[0005] A stator core according to an embodiment of the present disclosure includes a stator tooth portion and a stator yoke portion. The stator tooth portion includes a plurality of first laminations stacked axially along the stator core. The stator yoke portion is formed as a wound or stacked member and is connected to the stator tooth portion.

[0006] According to the stator core of the embodiment of the present disclosure, the stator teeth of the stator core are stacked axially by multiple first laminations to weaken the eddy current loss of the stator teeth, and the stator yoke is formed as a winding or stacked part to weaken the eddy current loss of the stator yoke. In this way, the eddy current loss of the stator core can be greatly weakened, thereby improving the thrust and efficiency of the linear motor.

[0007] According to the stator core of some embodiments of the present disclosure, a first connecting structure is formed on the stator yoke, and a second connecting structure is formed on the stator teeth. The first connecting structure cooperates with the second connecting structure to achieve the connection between the stator teeth and the stator yoke.

[0008] According to the stator core of some embodiments of the present disclosure, the first connection structure and the second connection structure are plug-fitted.

[0009] According to the stator core of some embodiments of the present disclosure, the first connection structure is formed as an insertion portion, and the second connection structure is formed as a socket.

[0010] According to the stator core of some embodiments of the present disclosure, the second connection structure is provided with a plurality of insertion holes, and the first connection structure is provided with a plurality of insertion parts, and the plurality of insertion parts are provided in a one-to-one correspondence with the plurality of insertion holes.

[0011] According to the stator core of some embodiments of the present disclosure, the stator yoke includes a yoke body and the insertion portion; along the stacking direction of the plurality of first laminations, the yoke body is arranged on one side of the stator teeth, and along the stacking direction of the plurality of first laminations, the insertion portion is connected to the side of the yoke body facing the stator teeth.

[0012] According to the stator core of some embodiments of the present disclosure, the stator teeth are provided with a first center hole, the insertion hole is recessed outward from the first center hole to form the insertion hole, and the insertion hole is connected to the first center hole.

[0013] According to the stator core of some embodiments of the present disclosure, in the radial direction of the stator teeth, the longitudinal cross-sectional area of ​​the insertion hole decreases in the direction toward the first center hole, and the shape of the insertion hole matches the shape of the insertion portion.

[0014] According to the stator core of some embodiments of the present disclosure, in the circumferential direction of the stator yoke, the insertion portion has two first side walls arranged opposite to each other, and the ends of the two first side walls adjacent to the first center hole are spaced apart from the inner wall of the insertion hole.

[0015] According to the stator core of some embodiments of the present disclosure, in the circumferential direction of the stator tooth portion, the insertion hole has two second side walls arranged opposite to each other, the two second side walls are connected by a third side wall, and a concave avoidance groove is provided at the corner of the third side wall and any one of the two second side walls.

[0016] According to the stator core of some embodiments of the present disclosure, the inner peripheral wall of the avoidance groove is formed as an arc-shaped surface.

[0017] According to the stator core of some embodiments of the present disclosure, at least part of the structure of the stator yoke is located on one side of the stator teeth, so that a winding slot is formed between the stator yoke and the stator teeth, and the winding slot is used for winding the coil.

[0018] According to the stator core of some embodiments of the present disclosure, a positioning protrusion is provided on at least one of the stator teeth and the stator yoke.

[0019] According to the stator core of some embodiments of the present disclosure, the positioning protrusion is formed on the stator tooth portion.

[0020] According to the stator core of some embodiments of the present disclosure, the outer peripheral wall of the stator tooth portion is provided with at least one wire passing slot.

[0021] According to the stator core of some embodiments of the present disclosure, the at least one wire passing slot includes a plurality of wire passing slots, and the plurality of wire passing slots are evenly spaced apart.

[0022] According to the stator core of some embodiments of the present disclosure, the stator yoke is wound along a first circumferential direction, and the axis of the first circumferential direction is parallel to or coincides with the axial direction.

[0023] According to the stator core of some embodiments of the present disclosure, the stator yoke includes a plurality of second laminations stacked along a second direction, and the axial direction intersects with the second direction.

[0024] According to the stator core of some embodiments of the present disclosure, the axial direction is arranged perpendicular to the second direction.

[0025] According to the stator core of some embodiments of the present disclosure, the first direction is arranged perpendicular to the second direction.

[0026] The present disclosure also provides a stator assembly.

[0027] The stator assembly according to an embodiment of the present disclosure includes: a stator core and a stator winding. The stator core is the stator core described in any of the above embodiments, and the stator winding is placed on the stator teeth and is sheathed on the stator yoke.

[0028] The present disclosure also proposes a linear motor.

[0029] According to an embodiment of the present disclosure, the linear motor comprises: a stator assembly and a mover assembly. The stator assembly is the stator assembly described in any of the above embodiments; and the mover assembly is movably matched with the stator assembly.

[0030] The present disclosure also proposes a suspension system, comprising the linear motor described in any of the above embodiments, wherein one of the stator assembly and the mover assembly is suitable for connection to a vehicle body, and the other of the stator assembly and the mover assembly is suitable for connection to a wheel.

[0031] The present disclosure also provides a vehicle comprising the suspension system described in any one of the above embodiments.

[0032] The advantages of the vehicle, the suspension system, the linear motor and the stator assembly are the same as those of the above-mentioned stator core compared to the related art, which will not be repeated here.

[0033] Additional aspects and advantages of the present disclosure will be set forth in part in the following description and, in part, will be obvious from the following description, or may be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present disclosure will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0035] FIG1 is a schematic structural diagram of a stator core according to some embodiments of the present disclosure;

[0036] Figure 2 is an enlarged view of circle A in Figure 1;

[0037] FIG3 is a schematic diagram of the stator yoke shown in FIG1 ;

[0038] Figure 4 is a cross-sectional view along line BB in Figure 3;

[0039] FIG5 is a schematic diagram of the stator teeth shown in FIG1 ;

[0040] FIG6 is an enlarged view of circle C in FIG5 ;

[0041] FIG. 7 is a schematic diagram of the insertion portion being inserted into the insertion hole.

[0042] Figure markings: stator core 10; axial direction X; stator tooth 1; first lamination 11; first center hole 12; insertion hole 13; second side wall 131; third side wall 132; avoidance groove 133; arc surface 1331; wire groove 14; stator yoke 2; yoke body 20; insertion part 21; first side wall 211; through hole 3; positioning protrusion 31; winding groove 4. DETAILED DESCRIPTION

[0043] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0044] The disclosure below provides many different embodiments or examples for realizing different structures of the present disclosure. In order to simplify the disclosure of the present disclosure, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present disclosure. In addition, the present disclosure may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present disclosure provides examples of various specific processes and materials, but a person of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials. In the related art, during the operation of the linear motor, the stator core will generate eddy current losses, thereby reducing the thrust and efficiency of the linear motor.

[0045] In order to solve the above technical problems, some embodiments of the present disclosure provide a stator core 10 to improve the thrust and efficiency of a linear motor.

[0046] A stator core 10 according to an embodiment of the present disclosure will be described below with reference to FIG. 1 to FIG. 7 .

[0047] As shown in FIG1 , a stator core 10 according to an embodiment of the present disclosure includes a stator tooth portion 1 and a stator yoke portion 2 .

[0048] The stator teeth 1 include a plurality of first laminations 11 stacked along the axial direction X of the stator core 10 . The stator yoke 2 is formed as a wound part or a stacked part. The stator yoke 2 is connected to the stator teeth 1 .

[0049] As a result, the eddy current loss of the stator core 10 can be greatly reduced, thereby improving the thrust and efficiency of the linear motor.

[0050] For example, the stator core 10 includes a stator tooth portion 1 and a stator yoke portion 2 .

[0051] As shown in FIG1 , the stator teeth 1 and the stator yoke 2 are connected. For example, the connection methods of the stator teeth 1 and the stator yoke 2 include but are not limited to welding, plugging, clamping, or the two are integrally formed.

[0052] As shown in Figure 2, the stator tooth portion 1 includes a plurality of first laminations 11, which can be silicon steel sheets. The plurality of first laminations 11 are stacked along the axial direction X of the stator core 10. Compared with the structure in which the stator tooth portion 1 is a whole conductor, the stator tooth portion 1 formed by stacking the plurality of first laminations 11 can reduce the eddy current loss of the stator tooth portion 1.

[0053] The stator yoke 2 is formed as a winding or a stacked part. For example, the stator yoke 2 is a winding part, which means that the stator yoke 2 is formed by spirally winding a whole piece of silicon steel sheet around the axis, or the stator yoke 2 can be formed by stacking a plurality of second laminations. Compared with the structure in which the stator yoke 2 is a whole piece of conductor, the stator yoke 2 arranged as a winding or stacked part can reduce the eddy current loss of the stator yoke 2.

[0054] For example, the stacking direction of the second laminates of the stack may be the same as or intersect with the stacking direction of the first laminates, which is not limited here.

[0055] For example, the axis of the helical winding of the wound element may be parallel to the axial direction X of the stator core 10. In this way, the multiple turns of the conductor of the wound element are distributed radially along the stator core 10. That is, the distribution direction of the multiple turns of the conductor in the radial direction of the stator yoke 2 is different from the distribution direction of the plurality of first laminations 11. Here, the distribution direction of the plurality of first laminations 11 corresponds to the stacking direction of the plurality of first laminations 11 described above.

[0056] It should be noted that when the linear motor is actually running, the direction of the magnetic circuit inside the linear motor will change. Therefore, in some embodiments of the present disclosure, by setting the distribution direction of the multi-turn conductor in the radial direction of the stator yoke 2 to be different from the distribution direction of the multiple first laminations 11, the stator teeth 1 and the stator yoke 2 can weaken the eddy current loss in different directions, thereby improving the working efficiency of the linear motor.

[0057] In some embodiments, the stator yoke 2 extends along the axial direction X and is located radially inward of the stator tooth 1. It should be noted that the radial direction in the above description refers to the direction passing through the geometric center of the stator tooth 1 on a cross section of the stator tooth 1 perpendicular to the axial direction X.

[0058] For example, the stator tooth 1 is configured as an annular structure, with the stator yoke 2 located radially inward of the annular structure. Alternatively, the stator tooth 1 is configured as a polygonal structure, with the direction toward the geometric center of the polygonal structure on a cross section perpendicular to the axial direction X being the radial inward. Alternatively, the stator tooth 1 may be configured as other shapes, which are not limited here.

[0059] As shown in FIG1 , the stator tooth portion 1 is provided with a first center hole 12 , and the stator yoke portion 2 and the first center hole 12 cooperate to define a through hole 3 extending along the axial direction X, so as to facilitate installation with the stator core 10 through the through hole 3 .

[0060] According to the stator core 10 of the embodiment of the present disclosure, the stator tooth portion 1 is composed of a plurality of first laminations 11 stacked along the axial direction X to weaken the eddy current loss of the stator tooth portion 1, and the stator yoke portion 2 is formed as a winding or stacked member to weaken the eddy current loss of the stator yoke portion 2. In this way, the eddy current loss of the stator core 10 can be greatly weakened, thereby improving the thrust and efficiency of the linear motor.

[0061] In some embodiments, a first connection structure is formed on the stator yoke 2 , and a second connection structure is formed on the stator tooth 1 . The first connection structure cooperates with the second connection structure to achieve the connection between the stator tooth 1 and the stator yoke 2 .

[0062] Therefore, through the cooperation of the first connecting structure and the second connecting structure, the connection between the stator tooth portion 1 and the stator yoke portion 2 can be achieved, thereby reducing the difficulty of connecting the stator tooth portion 1 and the stator yoke portion 2, and is conducive to improving the connection efficiency between the stator tooth portion 1 and the stator yoke portion 2.

[0063] For example, the cooperation manner between the first connection structure and the second connection structure includes but is not limited to snap connection, plug connection, bolt connection, welding, or bonding, etc.

[0064] In some embodiments, as shown in FIG. 1 , FIG. 2 and FIG. 7 , the first connection structure and the second connection structure are plug-fitted.

[0065] For example, the first connection structure is the insertion portion 21 and the second connection structure is the insertion hole 13. Alternatively, the first connection structure is the insertion hole 13 and the second connection structure is the insertion portion 21.

[0066] In this way, the connection stability between the stator yoke 2 and the stator tooth 1 can be enhanced, and the plug-in fitting method is simpler, which is conducive to reducing costs.

[0067] In some embodiments, the first connection structure is formed as an insert 21 , and the second connection structure is formed as a socket 13 .

[0068] Thus, the connection and fixation of the stator tooth portion 1 and the stator yoke portion 2 can be achieved through the plug-in fit of the insertion portion 21 and the socket, and the structure of the insertion portion 21 and the socket 13 is simpler, so as to reduce the difficulty of setting the first connection structure and the second connection structure, and help reduce the setting cost.

[0069] In some embodiments, as shown in Figures 5 and 6, the stator tooth portion 1 includes a plurality of jacks 13, and as shown in Figures 3 and 4, the stator yoke portion 2 includes a plurality of insertion portions 21, and the plurality of insertion portions 21 are arranged in a one-to-one correspondence with the plurality of jacks 13.

[0070] Thus, by plugging and fitting multiple insertion parts 21 and multiple insertion holes 13 in a one-to-one correspondence, the stator teeth 1 and the stator yoke 2 can be fixedly connected, and the connection stability of the stator teeth 1 and the stator yoke 2 can be enhanced.

[0071] For example, multiple insertion portions 21 can be distributed at intervals along the circumference of the stator yoke 2, and multiple insertion holes 13 can be distributed at intervals along the circumference of the first center hole 12. In this way, the connection stability of the stator tooth portion 1 and the stator yoke portion 2 can be enhanced in the circumferential direction of the stator core 10.

[0072] Of course, the distribution direction of the multiple insertion parts 21 and the multiple insertion holes 13 can also be the axial direction X or other directions, which is not limited here.

[0073] In some embodiments, the stator tooth portion 1 may include a socket 13, and the stator yoke portion 2 may include an insertion portion 21, and the insertion portion 21 is arranged corresponding to the socket 13, so that the connection between the stator tooth portion 1 and the stator yoke portion 2 can also be achieved.

[0074] In some embodiments, as shown in FIG4 , the stator yoke 2 includes a yoke body 20 and a plurality of insert portions 21. Along the stacking direction of the plurality of first laminations 11 (i.e., the axial direction X), the yoke body 20 is disposed on one side of the stator tooth 1, and the plurality of insert portions 21 are connected to the side of the yoke body 20 facing the stator tooth 1. For example, in the up-down direction shown in FIG4 (corresponding to the axial direction X), the yoke body 20 is disposed on the upper side of the stator tooth 1, and the plurality of insert portions 21 are connected to the lower side of the yoke body 20.

[0075] As a result, the yoke body 20 and the multiple insertion parts 21 are all located on the axial direction X of the stator tooth 1 on the stator core 10, and the multiple insertion parts 21 are located on the side of the yoke body 20 facing the stator tooth 1, so that the stator yoke 2 can move along the axial direction X to achieve corresponding plug-in fit between the insertion part 21 and the socket 13.

[0076] In some embodiments, as shown in FIG. 1 , the stator tooth portion 1 is provided with a first central hole 12 , and the insertion hole 13 is formed by the first central hole 12 being recessed outward, and the insertion hole 13 is communicated with the first central hole 12 .

[0077] For example, the side of the insertion hole 13 facing the first center hole 12 is open toward the first center hole 12 , so that the insertion hole 13 can be stamped on the radial inner side, thereby reducing the difficulty of processing the insertion hole 13 .

[0078] In some embodiments, in the radial direction of the stator tooth 1 , the longitudinal cross-sectional area of ​​the insertion hole 13 decreases in a direction toward the first central hole 12 , and the shape of the insertion hole 13 matches the shape of the insertion portion 21 .

[0079] The longitudinal cross-sectional area of ​​the insertion hole 13 gradually decreases in the direction toward the through hole 3, that is, the insertion hole 13 is formed into a dovetail groove structure that is open toward the radial inner side of the stator tooth portion 1. In this way, the opening width of the side of the insertion hole 13 facing the first center hole 12 is smaller than the opening width of the side of the insertion hole 13 facing away from the first center hole 12. Moreover, since the shape of the insertion hole 13 matches the shape of the insertion portion 21, the insertion portion 21 is not easy to fall out after being inserted into the insertion hole 13, thereby enhancing the connection strength between the stator tooth portion 1 and the stator yoke portion 2.

[0080] In some embodiments, as shown in FIG. 2 , in the circumferential direction of the stator yoke 2 , the insertion portion 21 has two first side walls 211 opposite to each other, and ends of the two first side walls 211 adjacent to the first center hole 12 are spaced apart from the inner wall of the insertion hole 13 .

[0081] Therefore, when the insertion portion 21 is inserted into the insertion hole 13, interference between the insertion portion 21 and the inner wall of the insertion hole 13 can be avoided, so that the insertion portion 21 can be more easily inserted into the insertion hole 13, thereby improving the assembly efficiency of the two.

[0082] In some embodiments, as shown in Figures 5 and 6, in the circumferential direction of the stator tooth portion 1, the socket 13 has a third side wall 132 and two oppositely arranged second side walls 131, the two second side walls 131 are connected by the third side wall 132, and a concave avoidance groove 133 is provided at the corner between the third side wall 132 and the corresponding second side wall 131.

[0083] Therefore, by providing an avoidance groove 133 at the corner of the third side wall 132 and the second side wall 131, that is, providing a chamfer at the corner of the third side wall 132 and the corresponding second side wall 131, it is possible to avoid interference between the insertion portion 21 and the corner of the third side wall 132 and the second side wall 131 when the insertion portion 21 is inserted into the socket 13, thereby facilitating easier insertion of the insertion portion 21 into the socket 13, thereby improving the assembly efficiency of the two.

[0084] In some embodiments, the inner peripheral wall of the avoidance groove 133 is formed as an arc surface 1331 .

[0085] Therefore, by forming the inner peripheral wall of the avoidance groove 133 into the arc-shaped surface 1331 , the processing of the avoidance groove 133 is facilitated, and stress concentration is reduced.

[0086] In some embodiments, as shown in FIG1 , at least part of the structure of the stator yoke 2 is located on one side of the stator tooth 1 , so that a winding slot 4 is formed between the stator yoke 2 and the stator tooth 1 , and the winding slot 4 is used for winding the coil.

[0087] Thus, the coil can be wound in the winding slot 4 defined between the stator yoke 2 and the stator tooth 1 , thereby fully utilizing the space between the stator yoke 2 and the stator tooth 1 , which is beneficial to improving space utilization.

[0088] In some embodiments, as shown in FIG1 , a positioning protrusion 31 is provided on at least one of the stator teeth 1 and the stator yoke 2 .

[0089] It should be noted that the stator assembly includes a mounting structure, and the stator core 10 is installed on the mounting structure. The mounting structure can be an axis (the same below), and the positioning protrusion 31 is suitable for positioning and cooperating with the mounting structure. Therefore, the positioning protrusion 31 can be used to position and guide the mounting structure to reduce the difficulty of assembling the mounting structure and the stator assembly, and it is beneficial to improve the assembly accuracy of the stator core 10 and the mounting structure through the positioning protrusion 31.

[0090] In some embodiments, as shown in FIG. 1 , a positioning protrusion 31 is formed on the stator tooth 1 .

[0091] For example, the positioning protrusion 31 is arranged on the inner wall of the first center hole 12. The positioning protrusion 31 can protrude radially inward along the first center hole 12 and extend along the axial direction X. In this way, when the positioning protrusion 31 is positioned with the mounting structure, it can play a limiting role in the circumferential direction of the first center hole 12 and play a guiding role in the axial direction X of the through hole 3, thereby ensuring the movement stability of the mounting structure.

[0092] In some embodiments, as shown in FIG1 , a wire groove 14 is provided on the outer peripheral wall of the stator tooth portion 1 .

[0093] Therefore, by providing the wire slot 14, the three-phase wires of the stator core 10 can be arranged in the wire slot 14. For example, the wire slot 14 is provided on the outer peripheral wall of the stator tooth portion 1 and extends along the axial direction X to avoid interference between the three-phase wires and the stator yoke portion 2, and it is beneficial to reduce the processing difficulty of the wire slot 14.

[0094] For example, the wire slot 14 can be made by stamping and laminating the first laminations 11, and the wire slot 14 is open toward the radial outside of the stator tooth portion 1, so that the three-phase line can be installed into the wire slot 14 along the opening of the wire slot 14, and at least part of the three-phase line can be arranged along the axial direction X to reduce the difficulty of arranging the three-phase line.

[0095] In some embodiments, the outer peripheral wall of the stator tooth portion 1 is provided with a plurality of wire grooves 14 arranged at even intervals.

[0096] Thus, by providing the wire slots 14, it is convenient to arrange the three-phase wires of the stator core 10 within the wire slots 14. For example, the outer peripheral wall of the stator tooth portion 1 is provided with three wire slots 14, and the three wire slots 14 are evenly spaced along the circumference of the stator tooth portion 1. This facilitates the installation of the three-phase wires of the stator core 10. In addition, after the positioning protrusions 31 are positioned and matched with the mounting structure, the three wire slots 14 evenly spaced along the circumference of the stator tooth portion 1 can be aligned.

[0097] In some embodiments, the winding direction or the stacking direction of the stator yoke 2 is different from the direction in which the plurality of first laminations are stacked.

[0098] For example, the axis of the spiral winding of the winding or the direction of stacking of the stacked parts may be different from the axial direction of the stator core 10, so that the multi-turn conductors of the winding part are distributed along a direction different from the axial direction of the stator core 10, that is, the distribution direction of the multi-turn conductors in the radial direction of the stator yoke 2 is different from the distribution direction of the multiple first laminations 11.

[0099] It should be noted that when the linear motor is actually running, the direction of the magnetic circuit inside the linear motor will change. Therefore, in some embodiments of the present disclosure, by setting the distribution direction of the multi-turn conductor of the winding to be different from the distribution direction (i.e., axial direction) of the multiple first laminations 11, the stator teeth 1 and the stator yoke 2 can weaken the eddy current loss in different directions, thereby improving the thrust and efficiency of the linear motor.

[0100] In some embodiments, the stator yoke 2 is wound along a first circumferential direction, and the axis of the first circumferential direction is parallel to or coincides with the axial direction X.

[0101] For example, the axis of the spirally wound winding is parallel to or coincides with the axial direction of the stator core 10, so that the multiple turns of conductors of the winding are distributed along the radial direction of the stator core 10. It should be noted that when the linear motor is actually running, the direction of the magnetic circuit inside the linear motor will change. Therefore, in some embodiments of the present disclosure, by setting the distribution direction of the multiple turns of conductors in the radial direction of the stator yoke 2 to be different from the distribution direction (i.e., the axial direction X) of the plurality of first laminations 11, the stator teeth 1 and the stator yoke 2 can reduce eddy current losses in different directions, thereby improving the thrust and efficiency of the linear motor.

[0102] In some embodiments, the stator yoke 2 includes a plurality of second laminations stacked along a second direction, and the axial direction X intersects the second direction.

[0103] For example, the plurality of second laminations are stacked in a direction intersecting with the axial direction X of the stator core 10, so that the stacking direction of the plurality of second laminations intersects with the axial direction of the stator core 10. It should be noted that during actual operation of the linear motor, the direction of the magnetic circuit inside the linear motor changes. Therefore, in some embodiments of the present disclosure, by setting the stacking direction of the plurality of second laminations to intersect with the axial direction of the stator core 10, the stator teeth 1 and the stator yoke 2 can reduce eddy current losses in different directions, thereby improving the thrust and efficiency of the linear motor.

[0104] In some embodiments, the axis X is perpendicular to the second direction.

[0105] For example, the plurality of second laminations are stacked in a direction perpendicular to the axial direction X of the stator core 10 , so that the stacking direction of the plurality of second laminations is perpendicular to the axial direction X of the stator core 10 , that is, the stacking direction of the plurality of second laminations is the radial direction of the stator core 10 .

[0106] It should be noted that when the linear motor is actually running, the direction of the magnetic circuit inside the linear motor will change. Therefore, in some embodiments of the present disclosure, by setting the stacking direction of multiple second laminations to be perpendicular to the axial direction of the stator core 10, the stator teeth 1 and the stator yoke 2 can weaken the eddy current loss in different directions (axial and radial), thereby improving the thrust and efficiency of the linear motor.

[0107] An embodiment of the stator core 10 of the present disclosure will be described below with reference to FIG. 1 to FIG. 7 .

[0108] The stator core 10 can be used in a three-phase permanent magnet synchronous linear motor and consists of a stator tooth 1 and a stator yoke 2. The stator tooth 1 is made of multiple first laminations 11 stacked in the axial direction X. The stator yoke 2 is made of circumferentially wound silicon steel sheets. Positioning protrusions 31 are provided on the inner circumferential wall of the stator tooth 1.

[0109] When assembling the mounting structure, the positioning protrusion 31 engages with the groove on the mounting structure to prevent the stator tooth portion 1 from rotating, thereby ensuring that the wire slots 14 of the stator core 10 are aligned. The outer peripheral wall of the stator tooth portion 1 is evenly distributed with three wire slots 14 along the circumference, and the three wire slots 14 correspond to the three-phase lines of the stator winding. For example, the stamped and laminated stator tooth portion 1 has an interference fit with the mounting structure, has high precision and can form a precise fit with the mounting structure. It should be noted that alignment means that the two ends of any two of the three wire slots 14 along the axial direction X are respectively located in the same plane.

[0110] The stator winding is coiled around the stator yoke 2 and placed on the stator teeth 1. When the linear motor is running, the magnetic lines of force are mainly distributed along the radial direction within the stator teeth 1 and the axial direction X within the stator yoke 2. The stator teeth 1 can significantly reduce the eddy current losses generated in the stator teeth 1 through the multiple first laminations 11 stacked in the axial direction X. The effect of the stator yoke 2 structure made of circumferentially wound silicon steel sheets is equivalent to the effect of the multiple first laminations 11 stacked in the axial direction X to reduce the eddy current losses in the stator teeth 1, and can significantly reduce the eddy current losses in the stator yoke 2.

[0111] Multiple insertion portions 21 are provided below the stator yoke 2. These insertion portions 21 have the same thickness as the stator teeth 1. These insertion portions 21 of the stator yoke 2 are inserted into the corresponding insertion holes 13 of the stator teeth 1, thereby securing the stator yoke 2 to the stator teeth 1. The thickness of the insertion portions 21 and stator teeth 1 refers to the dimension of the insertion portions 21 and stator teeth 1 parallel to the axial direction X.

[0112] Because the process for winding the iron core of an axial X-flux motor is relatively mature, the stator yoke 2 with multiple inserts 21 in some embodiments of the present disclosure is more feasible and also reduces eddy current losses in the stator yoke 2. Furthermore, through optimized design, the assembly process of the stator yoke 2 and the stator teeth 1 can be further improved.

[0113] The stator yoke 2 is formed by a process of stamping and then winding, and the insert portion 21 is made by stamping, and multiple insert portions 21 all use a trapezoidal punch. If a square punch is used, the avoidance groove 133 and the local area of ​​the stator tooth portion 1 will form assembly interference. In addition, if the avoidance groove 133 (rounded corners) are not designed, the life of the punch will be greatly shortened, resulting in increased costs. Therefore, using the same trapezoidal punch with rounded corners, the insert portion 21 structure is punched out while winding, thereby reducing process costs and meeting process assembly requirements.

[0114] Furthermore, as shown in Figure 7, when the insert portion 21 is inserted into the insertion hole 13 on the stator tooth 1, the rounded corners formed between the side surfaces of the insert portion 21 and the bottom surface of the insert portion 21 create a risk of the bottom end surface of the insert portion 21 not fitting properly with the end surface of the insertion hole 13. By using a trapezoidal punch, a certain angle is formed between the bottom end surface of the insert portion 21 and the side surfaces of the insert portion 21, which is directed toward the centerline of the insert portion 21. This ensures that the stator yoke 2 and the stator tooth 1 fit properly even when the rounded corners exist between the side surfaces of the insert portion 21 and the bottom surface of the insert portion 21, thereby ensuring structural reliability.

[0115] Because the same punch is used for stamping, the width of the insert portion 21 of the rolled stator yoke 2 varies radially, becoming wider as it approaches the outer edge, resulting in a dovetail trapezoidal shape as shown in Figure 7. The axially X-stacked stator teeth 1 in Figure 1 are formed by stamping multiple receptacles 13 at fixed locations. When the insert portion 21 is inserted into the receptacle 13, the slot opening width of the receptacle 13 is smaller than the width of the bottom of the receptacle 13, preventing the insert portion 21 from slipping out of the receptacle 13 and strengthening the fixation between the stator tooth 1 and the stator yoke 2.

[0116] In the circumferential direction of the stator yoke 2, the insertion portion 21 has opposing first side walls 211. The ends of the two first side walls 211 adjacent to the through-hole 3 are spaced apart from the inner wall of the insertion hole 13. When the insertion portion 21 is inserted into the insertion hole 13, the insertion portion 21 near the bottom of the insertion hole 13 will interfere with the rounded corners within the insertion hole 13. By spacing the ends of the two first side walls 211 adjacent to the through-hole 3 and the inner wall of the insertion hole 13, interference during installation can be avoided, ensuring that the insertion portion 21 of the stator yoke 2 can be properly inserted into the insertion hole 13 of the stator tooth 1, and completing the fixation of the stator yoke 2 and the stator tooth 1.

[0117] Thus, the axially X-stacked stator teeth 1 form an interference fit with the mounting structure, with the locating protrusions 31 embedded in the mounting structure's grooves to prevent relative rotation between the two. The circumferentially helically wound stator yoke 2 then inserts its insertion portion 21 into the insertion hole 13 of the stator tooth 1 to secure it to the stator tooth 1. This creates a mechanical connection between the helically wound stator yoke 2 and the axially X-stacked stator teeth 1, while laser welding further strengthens the connection between the stator yoke 2 and the stator tooth 1.

[0118] In summary, the stator core of some embodiments of the present disclosure has at least the following advantages over related technologies:

[0119] 1. The combined structure of the circumferential spiral winding of the stator yoke 2 and the axial X-stacked stator teeth 1 can significantly reduce the eddy current loss of the stator core 10 while ensuring higher motor thrust and efficiency.

[0120] 2. The process feasibility of circumferential spiral winding of the stator yoke 2 and axial X-stacking of the stator teeth 1 is relatively high.

[0121] 3. The stator teeth 1 and the stator yoke 2 are mechanically connected via the insert 21 and the socket 13, and the connection is strengthened by laser welding, making the structure tight and highly reliable.

[0122] 4. The inner circumference of the stator tooth portion 1 is formed by stamping, which has high precision and can form a precise fit with the mounting structure (for example, a shaft).

[0123] 5. The positioning protrusions 31 formed by stamping on the inner circumference of the stator tooth portion 1 can improve the assembly accuracy with the mounting structure, thereby ensuring that the three-phase wire slots 14 of the stator core 10 are aligned.

[0124] 6. The inner circumference of the stator yoke 2 is formed by spiral winding, and its accuracy is relatively limited, and it can form a clearance fit with the mounting structure.

[0125] 7. The utilization rate of the stator core 10 is high.

[0126] Some embodiments of the present disclosure also provide a stator assembly.

[0127] The stator assembly according to the embodiment of the present disclosure includes: a stator core 10 and a stator winding. The stator core 10 is the stator core 10 of any of the above embodiments. The stator winding is placed on the stator teeth 1 and is externally mounted on the stator yoke 2.

[0128] As a result, the stator teeth 1 can support the stator winding, and the stator yoke 2 can limit the stator winding, thereby enhancing the structural stability of the stator winding, and the stator winding is sheathed on the stator yoke 2.

[0129] In addition, the stator winding can fully utilize the space between the stator teeth 1 and the stator yoke 2, thereby improving space utilization, thereby reducing the overall structural size of the stator assembly and facilitating the miniaturization design of the stator assembly.

[0130] When the linear motor is operating, the magnetic lines of force extend primarily radially within the stator tooth 1 and axially (X) within the stator yoke 2. The multiple first laminations 11 stacked axially (X) on the stator tooth 1 significantly reduce eddy current losses generated within the stator tooth 1. The circumferentially wound winding acts as a function of the multiple first laminations 11 stacked axially (X) to reduce eddy current losses in the stator tooth 1, significantly reducing eddy current losses in the stator yoke 2.

[0131] According to the stator assembly of the embodiment of the present disclosure, its stator tooth portion 1 is composed of multiple first laminations 11 stacked along the axial direction X to weaken the eddy current loss of the stator tooth portion 1, and the stator yoke portion 2 is formed as a winding or stacked part to weaken the eddy current loss of the stator yoke portion 2. In this way, the eddy current loss of the stator core 10 can be greatly weakened, thereby improving the thrust and efficiency of the linear motor.

[0132] Some embodiments of the present disclosure also provide a linear motor.

[0133] According to an embodiment of the present disclosure, the linear motor includes: a stator assembly and a mover assembly, the stator assembly is the stator assembly of any of the above embodiments, and the mover assembly moves in coordination with the stator assembly.

[0134] According to the linear motor of the embodiment of the present disclosure, the stator tooth portion 1 of its stator assembly is composed of a plurality of first laminations 11 stacked along the axial direction X to weaken the eddy current loss of the stator tooth portion 1, and the stator yoke portion 2 is formed as a winding or stacked part to weaken the eddy current loss of the stator yoke portion 2. In this way, the eddy current loss of the stator core 10 can be greatly weakened, thereby improving the thrust and efficiency of the linear motor.

[0135] Some embodiments of the present disclosure also provide a suspension system, comprising a linear motor according to any of the above embodiments, wherein one of the stator assembly and the mover assembly is suitable for connection to a vehicle body, and the other of the stator assembly and the mover assembly is suitable for connection to a wheel.

[0136] Therefore, the linear motor can be used to transmit the force and torque acting between the wheel and the vehicle body, and to buffer the impact force transmitted to the vehicle body by the uneven road surface, thereby playing a vibration reduction role to ensure that the vehicle can run smoothly.

[0137] According to the suspension system of the embodiment of the present disclosure, the stator tooth portion 1 of its stator assembly is composed of multiple first laminations 11 stacked along the axial direction X to weaken the eddy current loss of the stator tooth portion 1, and the stator yoke portion 2 is formed as a winding or stacked part to weaken the eddy current loss of the stator yoke portion 2. In this way, the eddy current loss of the stator core 10 can be greatly weakened, thereby improving the thrust and efficiency of the linear motor.

[0138] Some embodiments of the present disclosure further provide a vehicle comprising the suspension system of any of the above embodiments.

[0139] According to the vehicle of the embodiment of the present disclosure, the stator tooth portion 1 of its stator assembly is composed of a plurality of first laminations 11 stacked along the axial direction X to weaken the eddy current loss of the stator tooth portion 1, and the stator yoke portion 2 is formed as a winding or stacked part to weaken the eddy current loss of the stator yoke portion 2. In this way, the eddy current loss of the stator core 10 can be greatly weakened, thereby improving the thrust and efficiency of the linear motor.

[0140] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present disclosure.

[0141] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the present disclosure, "plurality" means two or more, unless otherwise specifically defined.

[0142] In this disclosure, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0143] In the present disclosure, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0144] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are mutually inconsistent.

[0145] Although the embodiments of the present disclosure have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A stator core (10), comprising: Stator teeth (1), wherein the stator teeth (1) include a plurality of first laminations (11) stacked along the axial direction (X) of the stator core (10); and A stator yoke (2), which is formed as a wound member or a stacked member, and the stator yoke (2) is connected to the stator teeth (1).

2. The stator core (10) according to claim 1, wherein, A first connection structure is formed on the stator yoke (2), and a second connection structure is formed on the stator teeth (1), and the first connection structure cooperates with the second connection structure to realize the connection between the stator teeth (1) and the stator yoke (2).

3. The stator core (10) according to claim 2, wherein, The first connection structure and the second connection structure are in plug-in fit.

4. The stator core (10) according to claim 3, wherein, The first connection structure is formed as an insertion portion (21), and the second connection structure is formed as a jack (13).

5. The stator core (10) according to claim 4, wherein, The second connection structure is provided with a plurality of jacks (13), and the first connection structure is provided with a plurality of insertion portions (21), and the plurality of insertion portions (21) are arranged in one-to-one correspondence with the plurality of jacks (13).

6. The stator core (10) according to claim 4, wherein, The stator yoke (2) includes a yoke body (20) and the insertion portion (21); Along the stacking direction of the plurality of first laminations (11), the yoke body is arranged on one side of the stator teeth (1), and the insertion portion (21) is connected to the side of the yoke body facing the stator teeth (1).

7. The stator core (10) according to claim 4, wherein, The stator teeth (1) are provided with a first central hole (12), and the jack (13) is recessed outward from the first central hole (12) to form the jack (13), and the jack (13) communicates with the first central hole (12).

8. The stator core (10) according to claim 7, wherein, In the radial direction of the stator teeth (1), the longitudinal cross-sectional area of the jack (13) decreases in the direction towards the first central hole (12), and the shape of the jack (13) matches the shape of the insertion portion (21).

9. The stator core (10) according to claim 8, wherein, In the circumferential direction of the stator yoke (2), the insertion portion (21) has two first side walls (211) arranged oppositely, and the ends of the two first side walls (211) adjacent to the first central hole (12) are spaced from the inner wall of the jack (13).

10. The stator core (10) according to claim 5, wherein, In the circumferential direction of the stator teeth (1), the jack (13) has two second side walls (131) arranged oppositely, and the two second side walls (131) are connected by a third side wall (132), and a concave relief groove (133) is provided at the corner of the third side wall (132) and any one of the two second side walls (131).

11. The stator core (10) according to claim 10, wherein, The inner peripheral wall of the relief groove (133) is formed as an arc surface (1331).

12. The stator core (10) according to any one of claims 1-11, wherein, At least part of the structure of the stator yoke (2) is located on one side of the stator teeth (1), so that a winding groove (4) is formed between the stator yoke (2) and the stator teeth (1), and the winding groove (4) is used for winding a coil.

13. The stator core (10) according to any one of claims 1-12, wherein, At least one of the stator teeth (1) and the stator yoke (2) is provided with a positioning protrusion (31).

14. The stator core (10) according to claim 13, wherein, The positioning protrusion (31) is formed on the stator teeth (1).

15. The stator core (10) according to any one of claims 1-14, wherein, At least one wire slot (14) is provided on the outer peripheral wall of the stator tooth portion (1).

16. The stator core (10) according to claim 15, wherein, The at least one wire slot (14) includes a plurality of wire slots (14), and the plurality of wire slots (14) are arranged at uniform intervals.

17. The stator core (10) according to any one of claims 1-16, wherein, The winding direction or lamination direction of the stator yoke portion (2) is different from the stacking direction of the plurality of first laminations.

18. The stator core (10) according to claim 17, wherein, The stator yoke portion (2) is wound along a first circumferential direction, and the axis of the first circumferential direction is parallel to or coincides with the axial direction (X).

19. The stator core (10) according to claim 17, wherein, The stator yoke portion (2) includes a plurality of second laminations stacked along a second direction, and the axial direction (X) intersects with the second direction.

20. The stator core (10) according to claim 19, wherein, The axial direction (X) is perpendicular to the second direction.

21. A stator assembly, comprising: A stator core (10), the stator core (10) being the stator core (10) according to any one of claims 1-20; And A stator winding, the stator winding being placed on the stator tooth portion (1) and sleeved on the stator yoke portion (2).

22. A linear motor, comprising: A stator assembly, the stator assembly being the stator assembly according to claim 21; And A mover assembly, the mover assembly being movably engaged with the stator assembly.

23. A suspension system, comprising the linear motor according to claim 22, wherein one of the stator assembly and the mover assembly is adapted to be connected to the vehicle body, and the other of the stator assembly and the mover assembly is adapted to be connected to the wheel.

24. A vehicle, comprising the suspension system according to claim 23.

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