Stator mandrel, linear electric motor, electromagnetic suspension and vehicle

Abstract

A stator mandrel (1a), a linear electric motor (100), an electromagnetic suspension (40) and a vehicle (50). The stator mandrel (1a) comprises a mandrel body (11), a position sensor sensing member (12) and a mandrel sleeve (13). The position sensor sensing member (12) is mounted on an outer peripheral wall of the mandrel body (11); and the mandrel sleeve (13) is sleeved on the periphery of the mandrel body (11) and covers the position sensor sensing member (12).

Description

Stator core shaft, linear motor, electromagnetic suspension and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202410385508.1 and application date March 29, 2024, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of vehicle technology, and in particular to a stator core shaft, a linear motor, an electromagnetic suspension, and a vehicle. Background Art

[0004] The linear motor's position sensor is mounted on the stator core shaft and is used to detect position changes during relative movement between the stator assembly and the rotor assembly. In related art, the mounting method of the position sensor on the stator core shaft causes at least a portion of the position sensor to protrude from the outer circumference of the stator core shaft. When the bearing and the stator core shaft are engaged, interference between the position sensor and the bearing can occur, causing wear on the inner wall of the bearing and even blocking the linear motor. Furthermore, the outer circumference of the stator core shaft cannot form a good seal, allowing external moisture to easily enter the interior of the linear motor, potentially causing the linear motor to fail. Therefore, there is room for improvement.

[0005] Summary of the Invention

[0006] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present application is to provide a stator core shaft, wherein a core shaft sleeve is provided on the outer periphery of the core shaft body, and the core shaft sleeve covers a position sensor sensing element, so that the outer surface of the stator core shaft is formed with a complete circumferential surface, thereby preventing the position sensor sensing element from interfering with external components (such as bearings) due to protrusion from the stator core shaft; and further, a good sealing structure is formed on the outer periphery of the stator core shaft.

[0007] The present application proposes a linear motor having the above-mentioned stator core shaft.

[0008] The present application proposes an electromagnetic suspension having the above-mentioned linear motor.

[0009] The present application also proposes a vehicle having the electromagnetic suspension.

[0010] According to the stator core shaft of the first embodiment of the present application, the stator core shaft includes: a core shaft body; a position sensor sensing component installed on the outer peripheral wall of the core shaft body; and a core shaft sleeve, which is sleeved on the outer periphery of the core shaft body and covers the position sensor sensing component.

[0011] According to the stator core shaft of the embodiment of the present application, by sleeve-arranging a core shaft sleeve on the outer periphery of the core shaft body and the core shaft sleeve covering the position sensor sensing part, the outer surface of the stator core shaft can be formed with a complete circumferential surface, which can avoid the position sensor sensing part from interfering with external components (such as bearings) due to protruding from the stator core shaft; and the outer peripheral surface of the stator core shaft can form a good sealing structure.

[0012] According to some embodiments of the present application, an accommodating space is defined between the core shaft sleeve and the core shaft body, and the position sensor sensing component is located in the accommodating space.

[0013] According to some embodiments of the present application, the accommodating space is open along one axial side of the core shaft body to form an insertion opening, and the position sensor sensing component is suitable for being installed in the accommodating space through the insertion opening.

[0014] According to some embodiments of the present application, the position sensor sensing component is interference fit with the accommodating space.

[0015] According to some embodiments of the present application, the position sensor sensing component is fixed in the accommodating space by an adhesive layer.

[0016] According to some embodiments of the present application, a glue potting gap is defined between the position sensor sensing component and the inner wall of the accommodating space, and the adhesive layer fills the glue potting gap.

[0017] According to some embodiments of the present application, a limiting convex ring is formed on the outer peripheral wall of the core shaft body and is arranged around the core shaft body, and one axial end of the core shaft sleeve abuts against the limiting convex ring to limit the axial position of the core shaft sleeve.

[0018] According to some embodiments of the present application, the limiting protrusion ring does not protrude from the outer peripheral surface of the core shaft sleeve.

[0019] According to some embodiments of the present application, an insertion opening is defined between the other axial end of the core shaft sleeve and the core shaft body, and the position sensor sensing component is suitable for being installed in the accommodating space through the insertion opening.

[0020] According to some embodiments of the present application, a mounting groove is formed on the outer peripheral wall of the core shaft body, the position sensor sensing component is installed in the mounting groove, and the mounting groove constitutes at least a part of the accommodating space.

[0021] According to some embodiments of the present application, at least a portion of the bottom wall of the mounting groove is formed as a first mounting surface, the direction of the position sensor sensing component and the surface of the mounting surface are formed as a second mounting surface, and both the first mounting surface and the second mounting surface are planes.

[0022] According to some embodiments of the present application, the first mounting surface is in contact with the second mounting surface.

[0023] According to some embodiments of the present application, the surface of the position sensor sensing component facing away from the bottom wall of the mounting groove is the sensor outer surface, and the sensor outer surface is an arc-shaped surface and is coaxially arranged with the core shaft body.

[0024] According to some embodiments of the present application, the core shaft sleeve is interference fit with the core shaft body.

[0025] According to some embodiments of the present application, the position sensor sensing component is a magnetic position sensor sensing component, and the core shaft sleeve is a non-magnetic component.

[0026] According to some embodiments of the present application, an axial dimension of the core shaft sleeve is larger than an axial dimension of the position sensor sensing component along the core shaft body and smaller than an axial dimension of the core shaft body.

[0027] According to some embodiments of the present application, the core shaft sleeve includes a sleeve body and a mounting boss, the mounting boss is provided on the outer peripheral wall of the sleeve body, and the mounting boss is used to install a fixed buffer pad.

[0028] According to some embodiments of the present application, the wall thickness of the core shaft sleeve ranges from 1 mm to 4 mm.

[0029] According to some embodiments of the present application, the core shaft body is a one-piece piece.

[0030] According to the second aspect of the present application, the linear motor includes: a stator core shaft according to the first aspect of the present application; a stator assembly, the stator assembly is sleeved on the outer periphery of the stator core shaft and fixed relative to the stator core shaft, the stator assembly and the core shaft sleeve are arranged along the axial direction of the core shaft body; a mover assembly, sleeved on the outer periphery of the stator assembly, the mover assembly and the stator assembly are relatively movable along the axial direction of the stator core shaft, one axial end of the mover assembly has an assembly through hole, the core shaft sleeve is passed through the assembly through hole, and the mover assembly is provided with a position sensor reader corresponding to the position sensor sensing component.

[0031] According to the linear motor of the embodiment of the present application, by arranging a core shaft sleeve on the outer periphery of the core shaft body and the core shaft sleeve covering the position sensor sensing part, the outer surface of the stator core shaft can be formed with a complete circumferential surface, which can avoid the position sensor sensing part from interfering with external components (such as bearings) due to protruding from the stator core shaft; and a good sealing structure can be formed on the outer peripheral surface of the stator core shaft.

[0032] According to some embodiments of the present application, it includes: a first bearing, which is located in the assembly through hole and installed on the mover assembly, and the first bearing is sleeved on the outer periphery of the core shaft sleeve.

[0033] According to some embodiments of the present application, the linear motor includes: an oil seal, which is located in the assembly through hole and installed on the mover assembly, the oil seal is arranged on the outer periphery of the core shaft sleeve and is axially spaced apart from the first bearing, and the end of the assembly through hole that passes through the mover assembly is the outer end of the hole, and the oil seal is located on the side of the first bearing adjacent to the outer end of the hole.

[0034] According to some embodiments of the present application, the mover assembly includes a motor housing, and the linear motor also includes a guide rod, the guide rod is arranged in the motor housing and extends along the axial direction of the mover, and a guide channel extending along the axial direction of the stator core shaft is formed on the core shaft body, and the guide rod can be slidably accommodated in the guide channel along the axial direction of the stator assembly.

[0035] According to some embodiments of the present application, the position sensor read head is located on one axial side of the mover assembly and adjacent to the assembly through hole, and the position sensor read head is located on the outer peripheral side of the core shaft sleeve.

[0036] The electromagnetic suspension according to the third embodiment of the present application includes: the linear motor according to the above-mentioned second embodiment of the present application.

[0037] According to the electromagnetic suspension of the embodiment of the present application, by setting the above-mentioned linear motor, by arranging a core shaft sleeve on the outer periphery of the core shaft body and the core shaft sleeve covering the position sensor sensing part, the outer surface of the stator core shaft can be formed with a complete circumferential surface, which can avoid the position sensor sensing part from interfering with external components (such as bearings) due to protruding from the stator core shaft; and, a good sealing structure can be formed on the outer peripheral surface of the stator core shaft.

[0038] A vehicle according to an embodiment of the fourth aspect of the present application includes: an electromagnetic suspension according to an embodiment of the third aspect of the present application.

[0039] According to the vehicle of the embodiment of the present application, by setting the above-mentioned electromagnetic suspension, the electromagnetic suspension includes a linear motor, by setting the above-mentioned stator core shaft, by setting the above-mentioned linear motor, by sleeved on the outer periphery of the core shaft body and the core shaft sleeve covering the position sensor sensing part, the outer surface of the stator core shaft can be formed with a complete circumferential surface, which can avoid the position sensor sensing part from interfering with external components (such as bearings) due to protrusion from the stator core shaft; and the outer peripheral surface of the stator core shaft can form a good sealing structure.

[0040] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0042] FIG1 is a cross-sectional view of a linear motor according to some embodiments of the present application;

[0043] Figure 2 is an enlarged view of point A in Figure 1;

[0044] FIG3 is a top view of the stator assembly and stator core shaft of the linear motor in FIG1 ;

[0045] FIG4 is a perspective schematic diagram of the stator core shaft of the linear motor in FIG1 ;

[0046] FIG5 is a schematic diagram of the assembly of the core shaft body and the position sensor sensing element of the linear motor in FIG1;

[0047] FIG6 is a schematic diagram of the assembly of the core shaft body of the linear motor and the position sensor sensing element in FIG1 at another angle;

[0048] FIG7 is a schematic diagram of the assembly of the stator core shaft, the first bearing, and the oil seal in FIG1 ;

[0049] FIG8 is a cross-sectional view taken along line BB in FIG7;

[0050] FIG9 is a partial cross-sectional view of the stator core shaft of the linear motor in FIG1 ;

[0051] FIG10 is a partial cross-sectional view of the stator assembly and stator core shaft of the linear motor in FIG1;

[0052] FIG11 is a cross-sectional view of the core shaft sleeve of the stator core shaft in FIG1

[0053] FIG12 is a schematic diagram of an electromagnetic suspension according to an embodiment of the present application;

[0054] FIG13 is a simplified schematic diagram of a vehicle according to an embodiment of the present application.

[0055] Reference numerals:

[0056] 100. Linear motor;

[0057] 1. Stator assembly; 1a. Stator core shaft; 11. Core shaft body; 111. Accommodation space; 112. Insertion port; 114. Position limiting protrusion; 115. Mounting groove; 116. First mounting surface; 117. Guide channel; 12. Position sensor sensing element; 121. Second mounting surface; 122. Sensor outer surface; 123. Position sensor reader; 13. Core shaft sleeve; 131. Mounting boss; 132. Buffer pad; 133. Sleeve body;

[0058] 2. Mover assembly; 21. Assembly through hole; 22. Magnetic steel; 23. Motor housing;

[0059] 31. First bearing; 32. Oil seal; 33. Guide rod; 34. Second bearing;

[0060] 40. Electromagnetic suspension;

[0061] 50. Vehicle. DETAILED DESCRIPTION

[0062] The following describes in detail embodiments of the present application. Examples of the embodiments 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 only used to explain the present application and are not to be construed as limiting the present application.

[0063] A stator core shaft 1 a according to an embodiment of the present application will be described below with reference to FIG. 1 to FIG. 13 .

[0064] 4-6 , the stator core shaft 1a according to the first embodiment of the present application includes a core shaft body 11, a position sensor 12, and a core shaft sleeve 13. The position sensor 12 is mounted on the outer peripheral wall of the core shaft body 11. For example, a linear motor 100 includes a stator core shaft 1a, a stator assembly 1, and a mover assembly 2. When the linear motor 100 is operating, the mover assembly 2 and the stator assembly 1 will generate relative movement. The position sensor 12 is used to detect the position change of the mover assembly 2 and the stator assembly 1 during the relative movement.

[0065] The core shaft sleeve 13 is sleeved on the outer periphery of the core shaft body 11 and covers the position sensor sensing element 12. The core shaft sleeve 13 is sleeved on the outer periphery of the core shaft body 11, and the core shaft sleeve 13 can protect the core shaft body 11 and enhance the overall structural strength of the stator core shaft 1a.

[0066] For example, the position sensor sensing component 12 can be a magnetic position sensor sensing component 12, and the core shaft sleeve 13 covers the position sensor sensing component 12. Since the position sensor sensing component 12 is installed on the outer peripheral wall of the core shaft body 11, the core shaft sleeve 13 can protect the position sensor sensing component 12, and can prevent the position sensor sensing component 12 from absorbing impurities (such as iron filings) due to being exposed on the surface of the core shaft body 11. When the bearing is sleeved on the outer periphery of the stator core shaft 1a, the impurities absorbed by the position sensor sensing component 12 can be prevented from scratching the inner wall of the bearing; for another example, when the bearing moves back and forth axially on the surface of the stator core shaft 1a, since the outer surface of the core shaft sleeve 13 forms a complete circumferential surface, the core shaft sleeve 13 is sleeved on the outer periphery of the stator core shaft 1a, so that the outer surface of the stator core shaft 1a can form a complete circumferential surface, and the bearing is sleeved on the outer periphery of the core shaft sleeve 13, so that the inner wall of the bearing can be evenly stressed, reducing the bearing wear caused by local stress concentration on the inner wall of the bearing.

[0067] The position sensor sensing component 12 is installed on the outer peripheral wall of the core shaft body 11, and the core shaft sleeve 13 is sleeved on the outer periphery of the core shaft body 11 and the core shaft sleeve 13 covers the position sensor sensing component 12. Since the outer surface of the core shaft sleeve 13 forms a complete circumferential surface, the outer surface of the stator core shaft 1a can be formed with a complete circumferential surface. The bearing is sleeved on the outer periphery of the core shaft sleeve 13, which can avoid the position sensor sensing component 12 from interfering with the inner wall of the bearing due to protrusion from the stator core shaft 1a, causing wear of the inner wall of the bearing; and, the outer peripheral surface of the stator core shaft 1a can form a good sealing structure. For example, when the movable component 2 of the linear motor 100 is sleeved on the outer periphery of the stator core shaft 1a, it is convenient for the movable component 2 and the stator core shaft 1a to form a good sealing structure, thereby preventing external water vapor from entering the interior of the linear motor 100 and reducing the possibility of failure of the linear motor 100.

[0068] Among them, when the linear motor 100 is working, the mover assembly 2 and the stator assembly 1 will produce relative movement, including the following situations: for example, when the linear motor 100 is working, the stator assembly 1 is stationary, and the mover assembly 2 moves along the axial direction of the linear motor 100; for another example, the mover assembly 2 is stationary, and the stator assembly 1 moves along the axial direction of the linear motor 100; for another example, both the stator assembly 1 and the mover assembly 2 move along the axial direction of the linear motor 100.

[0069] Optionally, the mover assembly 2 may be a primary assembly and the stator assembly 1 may be a secondary assembly; alternatively, the mover assembly 2 may be a secondary assembly and the stator assembly 1 may be a primary assembly.

[0070] Alternatively, the stator core shaft 1a may be cylindrical or cylindrical.

[0071] Alternatively, the core shaft sleeve 13 may be a circular sleeve.

[0072] Optionally, the mover assembly 2 may be cylindrical.

[0073] According to the stator core shaft 1a of the embodiment of the present application, by sleeve-arranging the core shaft sleeve 13 on the outer periphery of the core shaft body 11 and the core shaft sleeve 13 covering the position sensor sensing part 12, the outer surface of the stator core shaft 1a can be formed with a complete circumferential surface, which can avoid the position sensor sensing part 12 from interfering with external components (such as bearings) due to protruding from the stator core shaft 1a; and the outer peripheral surface of the stator core shaft 1a can form a good sealing structure.

[0074] 4-6 , according to some embodiments of the present application, an accommodating space 111 is defined between the core shaft sleeve 13 and the core shaft body 11, and the position sensor sensing component 12 is located in the accommodating space 111. The accommodating space 111 facilitates the assembly of the position sensor sensing component 12 on the core shaft body 11, and can make the overall structure of the position sensor sensing component 12 and the core shaft body 11 compact; and can ensure that the core shaft sleeve 13 covers the position sensor sensing component 12, thereby protecting the position sensor sensing component 12, and is conducive to forming a complete circumferential surface on the outer surface of the stator core shaft 1a, which can avoid the position sensor sensing component 12 protruding from the outer surface of the stator core shaft 1a and interfering with external components (such as bearings).

[0075] 3 , 8 , and 9 , according to some embodiments of the present application, the accommodating space 111 is open along one axial side of the core shaft body 11 to form an insertion opening 112. The position sensor sensing component 12 is adapted to be installed into the accommodating space 111 through the insertion opening 112. The insertion opening 112 facilitates the assembly of the position sensor sensing component 12. For example, when installing the position sensor sensing component 12, the position sensor sensing component 12 can be installed into the accommodating space 111 through the insertion opening 112.

[0076] In addition, an accommodating space 111 is defined between the core shaft sleeve 13 and the core shaft body 11, and the position sensor sensing component 12 is located in the accommodating space 111. The accommodating space 111 is opened along the axial side of the core shaft body 11 to form an insertion port 112. After the core shaft sleeve 13 and the core shaft body 11 are assembled, the position sensor sensing component 12 can be installed in the accommodating space 111 through the insertion port 112.

[0077] Since the core shaft sleeve 13 isolates the position sensor sensing component 12 from the position sensor reader 123, in order not to affect the signal transmission between the position sensor sensing component 12 and the position sensor reader 123, the wall thickness of the core shaft sleeve 13 is relatively thin. For example, the wall thickness range of the core shaft sleeve 13 is set to 1 to 4 mm. During the assembly process of the core shaft sleeve 13 and the core shaft body 11, the core shaft sleeve 13 is easily deformed. Since the first bearing 31 is sleeved on the outer periphery of the core shaft sleeve 13, the first bearing 31 has high requirements for installation accuracy. Otherwise, the service life of the first bearing 31 is easily affected. Therefore, the core shaft sleeve 13 assembled with the core shaft body 11 needs to be fine-machined. Iron chips are easily generated during the fine-machining of the core shaft sleeve 13.

[0078] If the core shaft body 11 and the position sensor sensing part 12 are assembled first, and then the core shaft sleeve 13 is sleeved on the outer periphery of the core shaft body 11 and the position sensor sensing part 12, when the position sensor sensing part 12 is a magnetic position sensor sensing part, the iron chips caused by the fine processing of the deformed core shaft sleeve 13 are easily adsorbed by the position sensor sensing part 12, thereby causing the position sensor sensing part 12 to fail to detect.

[0079] By opening the accommodating space 111 along one axial side of the core shaft body 11 to form an insertion port 112, the core shaft sleeve 13 can be assembled into a component with the core shaft body 11 first, and then the core shaft sleeve 13 is fine-machined, and finally the position sensor sensing component 12 is inserted from the insertion port 112. After the position sensor sensing component 12 is inserted, the core shaft sleeve 13 does not need to be fine-machined again. It can also prevent the position sensor sensing component 12 from being installed first and then the core shaft sleeve 13, and the core shaft sleeve 13 from being deformed and then fine-machined, which causes iron filings to be adsorbed on the position sensor sensing component 12, thereby preventing the position sensor sensing component 12 from failing in detection.

[0080] 3 , 8 and 9 , according to some embodiments of the present application, the position sensor sensing element 12 is interference fit with the accommodating space 111 , so that the connection between the position sensor sensing element 12 and the core shaft body 11 and the core shaft sleeve 13 is simple and has strong stability.

[0081] 3 , 8 and 9 , according to some embodiments of the present application, the position sensor sensing element 12 is fixed in the accommodating space 111 by an adhesive layer, so that the connection between the position sensor sensing element 12 and the core shaft body 11 and the core shaft sleeve 13 can be simple and have strong stability.

[0082] 8-10 , according to some embodiments of the present application, a glue potting gap is defined between the position sensor sensing component 12 and the inner wall of the accommodating space 111, and the adhesive layer is filled in the glue potting gap, so that the position sensor sensing component 12 can fit tightly with the core shaft body 11 and the core shaft sleeve 13. The adhesive layer is filled in the glue potting gap to seal the accommodating space 111, thereby preventing external impurities (such as dust and iron filings) from entering the accommodating space 111 through the glue potting gap and affecting the position sensor sensing component 12.

[0083] For example, the filling process of the adhesive layer can be: the core shaft sleeve 13 is sleeved on the outer periphery of the core shaft body 11 and a receiving space 111 is defined between the core shaft sleeve 13 and the core shaft body 11, the receiving space 111 is open along the axial side of the core shaft body 11 to form an insertion port 112, the position sensor sensing component 12 is installed in the receiving space 111 through the insertion port 112, and a glue pouring gap is defined between the position sensor sensing component 12 and the inner wall of the receiving space 111, glue is poured into the glue pouring gap through the insertion port 112, and an adhesive layer is formed after solidification, completing the filling process of the adhesive layer in the glue pouring gap.

[0084] 5 and 6 , according to some embodiments of the present application, a limiting protrusion 114 is formed on the outer peripheral wall of the mandrel body 11 and is disposed around the mandrel body 11. One axial end of the mandrel sleeve 13 abuts against the limiting protrusion 114 to axially limit the mandrel sleeve 13. The limiting protrusion 114 can enhance the overall structural strength of the mandrel body 11, and can also play an axial limiting role in the assembly of the mandrel sleeve 13, ensuring that the assembly position of the mandrel sleeve 13 on the mandrel body 11 is accurate. It can also play a role in limiting the movement of the mandrel sleeve 13 on one axial end of the mandrel body 11, thereby enhancing the stability and reliability of the fit between the mandrel sleeve 13 and the mandrel body 11.

[0085] For example, the assembly process of the core shaft sleeve 13 can be: the core shaft sleeve 13 is sleeved on the core shaft body 11 and moved along the axial direction of the core shaft body 11, so that the core shaft sleeve 13 moves from the axial end of the core shaft body 11 away from the limiting protrusion 114 toward the direction close to the limiting protrusion 114. When the axial end of the core shaft sleeve 13 abuts the limiting protrusion 114, the assembly of the core shaft sleeve 13 on the core shaft body 11 is completed.

[0086] 5 and 6 , according to some embodiments of the present application, the limiting protrusion 114 does not protrude from the outer peripheral surface of the core shaft sleeve 13, which can make the overall structure of the core shaft body 11 and the core shaft sleeve 13 more compact, and can avoid the limiting protrusion 114 from interfering with the structure outside the stator core shaft 1a due to protruding from the outer peripheral surface of the core shaft sleeve 13.

[0087] 8-10 , according to some embodiments of the present application, an insertion opening 112 is defined between the other axial end of the core shaft sleeve 13 and the core shaft body 11. The position sensor sensing component 12 is adapted to be installed into the accommodating space 111 through the insertion opening 112. The insertion opening 112 defined by the other axial end of the core shaft sleeve 13 and the core shaft body 11 facilitates the assembly of the position sensor sensing component 12. For example, when installing the position sensor sensing component 12, the position sensor sensing component 12 can be installed into the accommodating space 111 through the insertion opening 112.

[0088] 5 and 6 , according to some embodiments of the present application, an installation groove 115 is formed on the outer peripheral wall of the core shaft body 11, and the position sensor sensing component 12 is installed in the installation groove 115. The installation groove 115 constitutes at least a portion of the accommodating space 111. The installation groove 115 can facilitate the assembly of the position sensor sensing component 12 and can make the overall structure of the position sensor sensing component 12 and the core shaft body 11 compact.

[0089] The installation groove 115 constituting at least part of the accommodating space 111 may include the following situations: for example, the installation groove 115 may constitute the entire part of the accommodating space 111; for another example, the installation groove 115 may constitute a part of the accommodating space 111.

[0090] 5 and 6 , according to some embodiments of the present application, at least a portion of the bottom wall of the mounting groove 115 is formed as a first mounting surface 116. The surface facing and mounting the position sensor element 12 is formed as a second mounting surface 121. Both the first mounting surface 116 and the second mounting surface 121 are planar. Both the first mounting surface 116 and the second mounting surface 121 are planar, facilitating a stable connection between the position sensor element 12 and the mounting groove 115.

[0091] Among them, at least part of the bottom wall of the mounting groove 115 is formed as the first mounting surface 116, which may include the following situations: for example, the entire bottom wall of the mounting groove 115 can be formed as the first mounting surface 116; for another example, a part of the bottom of the mounting groove 115 can be formed into the first mounting surface 116.

[0092] 5 and 6 , according to some embodiments of the present application, the first mounting surface 116 is fitted with the second mounting surface 121 , and both the first mounting surface 116 and the second mounting surface 121 are planes, which can facilitate the position sensor sensing component 12 to fit closely with the mounting groove 115 to form a stable contact, thereby simplifying the assembly process of the position sensor sensing component 12 and the mounting groove 115 and improving the overall stability of the position sensor sensing component 12, the core shaft body 11, and the core shaft sleeve 13.

[0093] 5-7 , according to some embodiments of the present application, the surface of the position sensor sensing element 12 that faces away from the bottom wall of the mounting groove 115 is the sensor outer surface 122. The sensor outer surface 122 is an arc-shaped surface and is coaxially arranged with the core shaft body 11. The outer peripheral wall of the core shaft body 11 is a circular surface, so that the sensor outer surface 122 matches the outer peripheral wall of the core shaft body 11. The inner peripheral wall of the core shaft sleeve 13 is formed with a circular surface, which facilitates the core shaft sleeve 13 to cover the outer periphery of the core shaft body 11 and cover the position sensor sensing element 12, so that the assembly of the core shaft sleeve 13 with the core shaft body 11 and the position sensor sensing element 12 is smooth, and the position sensor sensing element 12 can be prevented from protruding from the outer surface of the core shaft body 11, so that the outer surface of the stator core shaft 1a is formed with a complete circular surface. For example, when the bearing is sleeved on the outer surface of the stator core shaft 1a, the force on the bearing can be evenly distributed.

[0094] 4 , 6 and 7 , according to some embodiments of the present application, the core shaft sleeve 13 is interference fit with the core shaft body 11 , so that the connection method between the core shaft sleeve 13 and the core shaft body 11 is simple and has strong stability, which can reduce the possibility of the core shaft sleeve 13 loosening or offsetting due to vibration of the linear motor 100 or external impact.

[0095] 5 and 6 , according to some embodiments of the present application, the position sensor sensing element 12 is a magnetic position sensor sensing element, and the core shaft sleeve 13 is a non-magnetic element. The magnetic position sensor sensing element detects the position by detecting changes in the magnetic field. By making the core shaft sleeve 13 a non-magnetic element, interference with the magnetic position sensor sensing element caused by the magnetization of the core shaft sleeve 13 is avoided, thereby ensuring that the magnetic field of the magnetic position sensor sensing element is not affected, thereby improving the accuracy of detection of the magnetic position sensor sensing element.

[0096] Optionally, the core shaft sleeve 13 may be made of non-magnetic steel.

[0097] 3-5 , according to some embodiments of the present application, the axial dimension of the core shaft sleeve 13 is larger than the axial dimension of the position sensor sensing component 12 along the core shaft body 11 and smaller than the axial dimension of the core shaft body 11. The axial dimension of the core shaft sleeve 13 is larger than the axial dimension of the position sensor sensing component 12 along the core shaft body 11, which can ensure that the core shaft sleeve 13 covers the position sensor sensing component 12 to effectively protect the position sensor sensing component 12; furthermore, the axial dimension of the core shaft sleeve 13 is smaller than the axial dimension of the core shaft body 11, and the core shaft sleeve 13 is sleeved on the outer circumference of the core shaft body 11 without covering the entire core shaft body 11, which can avoid affecting the coordination between the core shaft body 11 and other components or other functional requirements.

[0098] By making the axial dimension of the core shaft sleeve 13 larger than the axial dimension of the position sensor sensing component 12 along the core shaft body 11 and smaller than the axial dimension of the core shaft body 11, the position detector sensing component 12 can be effectively protected, and the service life of the position sensor sensing component 12 can be extended without affecting the coordination between the core shaft body 11 and other components or other functional requirements.

[0099] 1 and 2 , according to some embodiments of the present application, the core shaft sleeve 13 includes a sleeve body 133 and a mounting boss 131. The mounting boss 131 is provided on the outer peripheral wall of the sleeve body 133 and is used to mount and fix a buffer pad 132. The mounting boss 131 can provide a stable support point for the stator core shaft 1a. For example, it can provide a stable support point when assembling the stator core shaft 1a with other components, thereby facilitating the fixing and support of the stator core shaft 1a, thereby facilitating the assembly of the stator core shaft 1a with other components. Furthermore, the mounting boss 131 can facilitate the installation and fixation of the buffer pad 132. Optionally, the buffer pad 132 can be annular and made of nylon or rubber.

[0100] Optionally, the linear motor 100 includes a stator assembly 1 and a stator core shaft 1a. The stator assembly 1 is sleeved on the outer circumference of the stator core shaft 1a. The outer surface of the stator core shaft 1a forms a complete circumferential surface. One axial end of the core shaft sleeve 13 abuts against the limiting protrusion 114. The mounting boss 131 is located at the other axial end of the core shaft sleeve 13. The mounting boss 131 extends along the circumference of the core shaft sleeve 13 and protrudes from the outer circumferential wall of the core shaft sleeve 13. There may be multiple mounting bosses 131, and the multiple mounting bosses 131 are arranged at intervals along the circumference of the core shaft sleeve 13. By fixing the mounting bosses 131, the stator core shaft 1a can be easily fixed and supported, thereby making the assembly between the stator core shaft 1a and the stator assembly 1 more convenient.

[0101] According to one embodiment of the present application, a linear motor 100 includes a stator assembly 1 and a mover assembly 2. The stator assembly 1 includes a winding and a stator. The mover assembly 2 is sleeved around the outer periphery of the stator assembly 1. The mover assembly 2 includes a motor housing 23 and a magnet 22. The magnet 22 is fixed to the inner wall of the motor housing 23. A buffer pad 132 is mounted and fixed to a side of a mounting boss 131 away from a limiting protrusion 114. When the linear motor 100 is in operation, the mover assembly 2 reciprocates along the axial direction of the stator assembly 1. The buffer pad 132 is mounted and fixed to a side of the mounting boss 131 away from the limiting protrusion 114, thereby limiting and buffering the movement of the mover assembly 2 along the stator assembly 1. It can also limit the axial movement distance of the mover assembly 2 and alleviate the impact force during the relative movement of the mover assembly 2 and the stator assembly 1, reducing the friction and wear between the mover assembly 2 and the stator assembly 1 caused by collision, thereby extending the service life of the linear motor 100.

[0102] 1 and 11 , according to some embodiments of the present application, the wall thickness w1 of the core shaft sleeve 13 ranges from 1 mm to 4 mm. For example, the wall thickness w1 of the core shaft sleeve 13 can be 1 mm, 2 mm, 2.5 mm, 3.5 mm, 4 mm, etc. By ensuring that the wall thickness w1 of the core shaft sleeve 13 is not less than 1 mm, the structural strength of the core shaft sleeve 13 is sufficient to withstand certain external impacts; by ensuring that the wall thickness w1 of the core shaft sleeve 13 is not greater than 4 mm, the normal transmission of signals between the position sensor sensing element 12 and the position sensor reader 123 can be ensured. By ensuring that the wall thickness w1 of the core shaft sleeve is in the range of 1 mm to 4 mm, the structural strength of the core shaft sleeve 13 is sufficient to withstand certain external impacts; and the normal transmission of signals between the position sensor sensing element 12 and the position sensor reader 123 can be ensured.

[0103] According to some embodiments of the present application, the core shaft body 11 is an integral part, which can improve the reliability of the core shaft body 11, improve the overall structural strength of the core shaft body 11, and increase the assembly speed of the core shaft body 11 and the assembly parts (such as the core shaft sleeve 13).

[0104] 1 , a linear motor 100 according to an embodiment of the second aspect of the present application includes a stator core shaft 1a, a stator assembly 1, and a mover assembly 2 according to the embodiment of the first aspect of the present application. When the linear motor 100 is in operation, relative movement can occur between the stator assembly 1 and the mover assembly 2 along the axial direction of the linear motor 100. When the linear motor 100 is used in the electromagnetic suspension 40 of a vehicle 50, the stator assembly 1 can be connected to the vehicle body, and the mover assembly 2 can be connected to the wheels. For example, the upper end of the stator assembly 1 is connected to the vehicle body, and the lower end of the mover assembly 2 is connected to the wheels.

[0105] The stator assembly 1 is sleeved on the outer circumference of the stator core shaft 1a and is fixed relative to the stator core shaft 1a. The stator assembly 1 and the core shaft sleeve 13 are arranged along the axial direction of the core shaft body 11 to avoid interference between the stator assembly 1 and the core shaft sleeve 13.

[0106] The mover assembly 2 is sleeved around the outer periphery of the stator assembly 1. The mover assembly 2 and the stator assembly 1 are relatively movable along the axial direction of the stator core shaft 1a. One axial end of the mover assembly 2 has an assembly through-hole 21, and the core shaft sleeve 13 is inserted into the assembly through-hole 21. The assembly through-hole 21 facilitates the installation of the core shaft sleeve 13, thereby facilitating the assembly of the stator assembly 1 and the mover assembly 2.

[0107] The mover assembly 2 is provided with a position sensor reader 123 corresponding to the position sensor sensing element 12 . The position sensor reader 123 can read the signal generated by the position sensor sensing element 12 to determine the position change when the mover assembly 2 and the stator assembly 1 move relative to each other.

[0108] Optionally, referring to FIG1 , according to one embodiment of the present application, a linear motor 100 includes a mover assembly 2, a stator core shaft 1a, and a first bearing 31. The mover assembly 2 and the first bearing 31 are sleeved around the outer periphery of the stator core shaft 1a. When the linear motor 100 is in operation, the stator assembly 1 and the mover assembly 2 move relative to each other, and the first bearing 31 reciprocates with the mover assembly 2 relative to the stator core shaft 1a. By sleeved around the outer periphery of the core shaft body 11 and covering the position sensor sensing element 12, the position sensor sensing element 12 is prevented from protruding from the stator core shaft 1a and interfering with the first bearing 31, thereby preventing the first bearing 31 from wearing or even blocking the linear motor 100. Furthermore, the outer periphery of the stator core shaft 1a can form a good sealing structure, which can cooperate with the mover assembly 2 to form a good sealing structure, thereby facilitating the formation of a good sealing structure for the linear motor 100 and preventing external impurities (such as water vapor) from entering the interior of the linear motor 100 and causing the linear motor 100 to fail.

[0109] According to the linear motor 100 of the embodiment of the present application, by providing the above-mentioned stator core shaft 1a, by sleevedly arranging the core shaft sleeve 13 on the outer periphery of the core shaft body 11 and the core shaft sleeve 13 covering the position sensor sensing part 12, the outer surface of the stator core shaft 1a can be formed with a complete circumferential surface, which can avoid the position sensor sensing part 12 from interfering with external components (such as bearings) due to protruding from the stator core shaft 1a; and, a good sealing structure can be formed on the outer peripheral surface of the stator core shaft 1a.

[0110] 1 and 7 , according to some embodiments of the present application, a linear motor 100 includes a first bearing 31 . The first bearing 31 is located within the assembly through-hole 21 and is mounted on the mover assembly 2 . The first bearing 31 is sleeved around the outer periphery of the spindle sleeve 13 . The first bearing 31 is sleeved around the outer periphery of the spindle sleeve 13 and is mounted on the mover assembly 2 . The first bearing 31 cooperates with the stator spindle 1a to support the stator spindle 1a , thereby enhancing the stability of the stator spindle 1a and reducing vibration generated by the stator spindle 1a during operation of the linear motor 100 .

[0111] 1 and 7 , according to some embodiments of the present application, a linear motor 100 includes an oil seal 32 . The oil seal 32 is located within the assembly through-hole 21 and is mounted on the mover assembly 2 . The oil seal 32 is sleeved around the outer circumference of the spindle sleeve 13 and is axially spaced apart from the first bearing 31 . The oil seal 32 enhances the sealing function of the linear motor 100 , preventing substances within the linear motor 100 from leaking through the assembly through-hole 21 , and blocks external impurities (e.g., dust and moisture) from entering the linear motor 100 , thereby protecting the environment within the linear motor 100 and extending the service life of the linear motor 100 . Furthermore, the axial spacing between the oil seal 32 and the first bearing 31 prevents interference between the oil seal 32 and the first bearing 31 , thereby ensuring the normal operation of the oil seal 32 sealing the linear motor 100 and the first bearing 31 supporting the stator spindle 1 a .

[0112] The end of the through-hole 21 that passes through the movable assembly 2 is the outer end of the hole. The oil seal 32 is located on the side of the first bearing 31 adjacent to the outer end of the hole. The oil seal 32 is located on the side of the first bearing 31 adjacent to the outer end of the hole to prevent external impurities (such as dust) from entering the interior of the first bearing 31, thereby extending the service life of the first bearing 31.

[0113] 1 and 7 , according to some embodiments of the present application, the mover assembly 2 includes a motor housing 23, which is fixed to the inner wall of the motor housing 23. The linear motor 100 further includes a guide rod 33, which is disposed in the motor housing 23 and extends along the axial direction of the mover. A guide channel 117 extending along the axial direction of the stator core shaft 1a is formed on the core shaft body 11, and the guide rod 33 is slidably accommodated in the guide channel 117 along the axial direction of the stator assembly 1. The guide rod 33 can guide the movement of the mover assembly 2. The cooperation between the guide channel 117 and the guide rod 33 can guide and limit the movement of the guide rod 33, ensuring that the guide rod 33 moves along a set direction and a set trajectory, and preventing the guide rod 33 from separating from the stator core shaft 1a during the sliding process, thereby ensuring that the mover assembly 2 moves along the set direction and a set trajectory.

[0114] Optionally, according to one embodiment of the present application, the linear motor 100 further includes a second bearing 34 , which is located in the guide channel 117 and sleeved on the outer periphery of the guide rod 33 , and is mounted on the stator core shaft 1 a .

[0115] Optionally, the movable component 2 may be a primary component and the stator component 1 may be a secondary component. In this case, the movable component 2 includes a motor housing 23 and a winding, and the winding is installed in the motor housing 23. The motor housing 23 can be used as an iron core, and the stator component 1 includes a magnet 22. Alternatively, the movable component 2 may be a secondary component and the stator component 1 may be a primary component. The movable component 2 includes a motor housing 23 and a magnet 22, and the magnet 22 is installed on the inner wall of the motor housing 23. The stator component 1 includes an iron core and a winding, and the winding is installed in the iron core.

[0116] Referring to Figure 1, according to some embodiments of the present application, the position sensor head 123 is located on the axial side of the movable subassembly 2 and the position sensor head 123 is adjacent to the assembly through hole 21. The position sensor head 123 is located on the axial side of the movable subassembly 2 and the position sensor head 123 is adjacent to the assembly through hole 21, which can facilitate the installation of the position sensor head 123 on the movable subassembly 2 through the assembly through hole 21; and, the position sensor head 123 is located on the outer peripheral side of the core shaft sleeve 13, so that the signal generated by the position sensor sensing component 12 located inside the core shaft sleeve 13 can be transmitted to the position sensor head 123 more quickly, thereby improving the efficiency of signal transmission between the position sensor head 123 and the position sensor sensing component 12.

[0117] 1 and 7 , the electromagnetic suspension 40 according to the third embodiment of the present application includes the linear motor 100 according to the second embodiment of the present application.

[0118] According to the electromagnetic suspension 40 of the embodiment of the present application, by setting the above-mentioned linear motor 100, by setting the above-mentioned stator core shaft 1a, by setting the above-mentioned stator core shaft 1a, by setting the core shaft sleeve 13 on the outer periphery of the core shaft body 11 and the core shaft sleeve 13 covering the position sensor sensing part 12, the outer surface of the stator core shaft 1a can be formed with a complete circumferential surface, which can avoid the position sensor sensing part 12 from interfering with external components (such as bearings) due to protruding from the stator core shaft 1a; and, the outer peripheral surface of the stator core shaft 1a can form a good sealing structure.

[0119] 1 and 7 , a vehicle 50 according to an embodiment of the fourth aspect of the present application includes an electromagnetic suspension 40 according to the embodiment of the third aspect of the present application.

[0120] According to the vehicle 50 of the embodiment of the present application, by setting the above-mentioned electromagnetic suspension 40, the electromagnetic suspension 40 includes a linear motor 100, by setting the above-mentioned stator core shaft 1a, by setting the above-mentioned stator core shaft 1a, by setting the above-mentioned linear motor 100, by setting the above-mentioned stator core shaft 1a, by sleeved the core shaft sleeve 13 on the outer periphery of the core shaft body 11 and the core shaft sleeve 13 covers the position sensor sensing part 12, the outer surface of the stator core shaft 1a can be formed with a complete circumferential surface, which can avoid the position sensor sensing part 12 from interfering with external components (such as bearings) due to protruding from the stator core shaft 1a; and the outer peripheral surface of the stator core shaft 1a can form a good sealing structure.

[0121] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," 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 application. In this specification, the illustrative expressions 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 suitable manner in any one or more embodiments or examples.

[0122] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A stator core shaft (1a), wherein: include: Mandrel body (11); A position sensor induction component (12) is mounted on the outer peripheral wall of the core shaft body (11); The core shaft sleeve (13) is sleeved on the outer periphery of the core shaft body (11) and covers the position sensor sensing component (12).

2. The stator core shaft (1a) according to claim 1, wherein An accommodating space (111) is defined between the core shaft sleeve (13) and the core shaft body (11), and the position sensor sensing component (12) is located in the accommodating space (111).

3. The stator core shaft (1a) according to claim 2, wherein The accommodating space (111) is open along one axial side of the core shaft body (11) to form an insertion opening (112), and the position sensor sensing component (12) is suitable for being installed in the accommodating space (111) through the insertion opening (112).

4. The stator core shaft (1a) according to claim 2 or 3, wherein: The position sensor induction component (12) is fixed in the accommodating space (111) via an adhesive layer.

5. The stator core shaft (1a) according to any one of claims 2 to 4, wherein: The outer peripheral wall of the core shaft body (11) is formed with a limiting convex ring (114) arranged around the core shaft body (11), and one axial end of the core shaft sleeve (13) abuts against the limiting convex ring (114) to limit the axial position of the core shaft sleeve (13).

6. The stator core shaft (1a) according to claim 5, wherein The limiting protruding ring (114) does not protrude from the outer peripheral surface of the core shaft sleeve (13).

7. The stator core shaft (1a) according to claim 5 or 6, wherein: An insertion opening (112) is defined between the other axial end of the core shaft sleeve (13) and the core shaft body (11), and the position sensor sensing component (12) is suitable for being installed in the accommodating space (111) through the insertion opening (112).

8. The stator core shaft (1a) according to any one of claims 2 to 7, wherein: The outer peripheral wall of the core shaft body (11) is formed with a mounting groove (115), the position sensor induction component (12) is mounted in the mounting groove (115), and the mounting groove (115) constitutes at least a portion of the accommodating space (111).

9. The stator core shaft (1a) according to claim 8, wherein At least a portion of the bottom wall of the mounting groove (115) is formed as a first mounting surface (116), the orientation of the position sensor sensing element (12) and the surface of the mounting surface are formed as a second mounting surface (121), and both the first mounting surface (116) and the second mounting surface (121) are planes.

10. The stator core shaft (1a) according to claim 9, wherein The first mounting surface (116) is in contact with the second mounting surface (121).

11. The stator core shaft (1a) according to claim 8, wherein The core shaft sleeve (13) and the core shaft body (11) are interference fit.

12. The stator core shaft (1a) according to any one of claims 1 to 11, wherein: The position sensor induction component (12) is a magnetic position sensor induction component, and the core shaft sleeve (13) is a non-magnetic conductive component.

13. The stator core shaft (1a) according to any one of claims 1 to 12, wherein: The axial dimension of the core shaft sleeve (13) is larger than the axial dimension of the position sensor induction component (12) along the core shaft body (11) and smaller than the axial dimension of the core shaft body (11).

14. The stator core shaft (1a) according to any one of claims 1 to 13, wherein: The core shaft sleeve (13) comprises a sleeve body (133) and a mounting boss (131). The mounting boss (131) is provided on the outer peripheral wall of the sleeve body (133). The mounting boss (131) is used for mounting a fixed buffer pad (132).

15. The stator core shaft (1a) according to any one of claims 1 to 14, wherein: The wall thickness of the core shaft sleeve (13) ranges from 1 mm to 4 mm.

16. The stator core shaft (1a) according to any one of claims 1 to 15, wherein: The core shaft body (11) is an integral piece.

17. A linear motor (100), wherein: include: The stator core shaft (1a) according to any one of claims 1 to 16; A stator assembly (1), wherein the stator assembly (1) is sleeved on the outer periphery of the stator core shaft (1a) and is fixed relative to the stator core shaft (1a), and the stator assembly (1) and the core shaft sleeve (13) are arranged along the axial direction of the core shaft body (11); A movable subassembly (2) is sleeved on the outer periphery of the stator subassembly (1); the movable subassembly (2) and the stator subassembly (1) are relatively movable along the axial direction of the stator core shaft (1a); one axial end of the movable subassembly (2) has an assembly through hole (21); the core shaft sleeve (13) is passed through the assembly through hole (21); and a position sensor reader (123) corresponding to the position sensor sensing element (12) is provided on the movable subassembly (2).

18. The linear motor (100) according to claim 17, wherein: include: A first bearing (31), the first bearing (31) is located in the assembly through hole (21) and is mounted on the movable subassembly (2), and the first bearing (31) is sleeved on the outer periphery of the core shaft sleeve (13).

19. The linear motor (100) according to claim 18, wherein: include: An oil seal (32) is located in the assembly through hole (21) and is installed on the movable subassembly (2). The oil seal (32) is sleeved on the outer periphery of the core shaft sleeve (13) and is arranged axially spaced apart from the first bearing (31). One end of the assembly through hole (21) that passes through the movable subassembly (2) is the outer end of the hole. The oil seal (32) is located on a side of the first bearing (31) adjacent to the outer end of the hole.

20. The linear motor (100) according to any one of claims 17 to 19, wherein: The mover assembly (2) includes a motor housing (23), and the linear motor (100) further includes a guide rod (33). The guide rod (33) is provided in the motor housing (23) and extends along the axial direction of the mover. A guide channel (117) extending along the axial direction of the stator core shaft (1a) is formed on the core shaft body (11), and the guide rod (33) is slidably accommodated in the guide channel (117) along the axial direction of the stator assembly (1).

21. The linear motor (100) according to any one of claims 17 to 20, wherein: The position sensor reading head (123) is located on one axial side of the movable subassembly (2) and adjacent to the assembly through hole (21), and the position sensor reading head (123) is located on the outer peripheral side of the core shaft sleeve (13).

22. An electromagnetic suspension (40), wherein: include: A linear motor (100) according to any one of claims 17 to 21.

23. A vehicle (50) wherein: include: The electromagnetic suspension (40) according to claim 22.

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