Linear motor, electromagnetic suspension, and vehicle

Abstract

A linear motor (100), an electromagnetic suspension (40), and a vehicle (50). The linear motor (100) comprises a stator assembly (1) and a rotor assembly (2). The rotor assembly (2) is sleeved on the periphery of the stator assembly (1) and defines a first cavity (21) and a second cavity (22) between the rotor assembly (2) and the stator assembly (1); the first cavity (21) and the second cavity (22) are respectively located on two sides of the stator assembly (1) in the axial direction, so as to allow relative movement between the stator assembly (1) and the rotor assembly (2); the first cavity (21) is in communication with the second cavity (22); at least one of the first cavity (21) and the second cavity (22) is in communication with an external space of the rotor assembly (2).

Description

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 2024103784828 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 linear motor, an electromagnetic suspension, and a vehicle. Background Art

[0004] The electromagnetic suspension is connected between the vehicle's body and wheels, attenuating vehicle body vibrations through the thrust generated by a linear motor. When the linear motor is operating, the mover and stator components within the linear motor undergo relative motion. During this process, the space above and below the mover is frequently compressed and expanded, resulting in a significant pressure difference between the upper and lower spaces of the mover. This pressure difference affects the reciprocating motion of the linear motor, causing thrust fluctuations. This increased pressure in the upper and lower spaces also results in significant energy loss.

[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 propose a linear motor, which connects at least one of the first cavity and the second cavity located on both sides of the stator assembly with the external space of the mover assembly, so that the gas in the first cavity and the second cavity can be directly or indirectly exchanged with the air in the external space of the mover assembly, which helps to quickly adjust the pressure in the first cavity and the second cavity, reduce the pressure difference between the first cavity and the second cavity, thereby reducing the reciprocating motion of the linear motor from being affected by the pressure difference and generating thrust fluctuations, thereby reducing energy loss.

[0007] The present application proposes an electromagnetic suspension having the above-mentioned linear motor.

[0008] The present application also proposes a vehicle having the electromagnetic suspension.

[0009] According to the linear motor of the embodiment of the first aspect of the present application, the linear motor includes: a stator assembly; a mover assembly, which is arranged on the outer circumference of the stator assembly and defines a first cavity and a second cavity between the mover assembly and the stator assembly, the first cavity and the second cavity are respectively located on both axial sides of the stator assembly to allow the stator assembly and the mover assembly to move relative to each other, the first cavity is connected to the second cavity, and at least one of the first cavity and the second cavity is connected to the external space of the mover assembly.

[0010] According to the linear motor of the embodiment of the present application, by connecting at least one of the first cavity and the second cavity located on both sides of the stator assembly with the external space of the mover assembly, the gas in the first cavity and the second cavity can be directly or indirectly exchanged with the air in the external space of the mover assembly, which helps to quickly adjust the pressure in the first cavity and the second cavity, reduce the pressure difference between the first cavity and the second cavity, thereby reducing the reciprocating motion of the linear motor from being affected by the pressure difference and generating thrust fluctuations, thereby reducing energy loss.

[0011] According to some embodiments of the present application, an air gap is provided between the mover assembly and the stator assembly, and the first cavity and the second cavity are connected through the air gap.

[0012] According to some embodiments of the present application, a connecting groove is provided on the movable subassembly, and the connecting groove connects the first cavity and the second cavity.

[0013] According to some embodiments of the present application, a breathable valve is provided on the mover assembly, and the breathable valve connects the first cavity and the external space of the mover assembly.

[0014] According to some embodiments of the present application, the breathable valve includes a valve body and a waterproof breathable membrane. A ventilation channel connecting the first cavity and the external space of the movable subassembly is formed in the valve body, and the waterproof breathable membrane is arranged in the ventilation channel.

[0015] According to some embodiments of the present application, the ventilation channel includes a first channel section and a second channel section located on opposite sides of the waterproof and breathable membrane, the first channel section is adjacent to the first cavity relative to the second channel section and is connected to the first cavity, and a ventilation hole connecting the first channel section and the external space of the movable subassembly is formed on the wall of the second channel section.

[0016] According to some embodiments of the present application, the valve body includes a valve main body and a valve cover, a ventilation channel is formed on the valve main body, the valve cover is connected to the end of the valve main body away from the first cavity and covers the end of the second channel section away from the waterproof breathable membrane, and the ventilation hole is formed on the peripheral wall of the second channel section.

[0017] According to some embodiments of the present application, there are multiple ventilation holes, and the multiple ventilation holes are arranged at intervals along the circumference of the second channel segment.

[0018] According to some embodiments of the present application, a first step surface is formed on the inner wall of the ventilation channel, the first step surface is located between the first channel section and the second channel section, and the waterproof breathable membrane is fixed to the first step surface.

[0019] According to some embodiments of the present application, the cross-sectional area of ​​the second channel segment is greater than the cross-sectional area of ​​the first channel segment, and the waterproof and breathable membrane is located in the second channel segment.

[0020] According to some embodiments of the present application, a mounting hole is provided on the movable subassembly, and the mounting hole includes a first hole segment and a second hole segment arranged along the axial direction of the mounting hole, the first hole segment is close to the first cavity relative to the second hole segment and is connected to the first cavity, the valve body is connected to the first hole segment, and a ventilation groove connected to the external space of the movable subassembly is defined between the outer peripheral wall of the valve body and the inner peripheral wall of the second hole segment, and the ventilation groove is located on the outer peripheral side of the second channel segment and is connected to the second channel segment through the ventilation hole.

[0021] According to some embodiments of the present application, the outer peripheral wall of the valve body is spaced apart from the inner peripheral wall of the second hole section to form a ventilation groove.

[0022] According to some embodiments of the present application, the breathable valve is installed on the peripheral wall of the movable subassembly, and the breathable valve does not protrude from the outer peripheral wall surface of the movable subassembly.

[0023] According to some embodiments of the present application, a mounting hole is provided on the movable subassembly, and the air vent is installed in the mounting hole; the mounting hole includes a first hole segment and a second hole segment arranged along the axial direction of the mounting hole, the first hole segment is close to the first cavity relative to the second hole segment and is connected to the first cavity, the air vent is connected to the first hole segment, a second step surface is formed between the first hole segment and the second hole segment, and a third step surface is formed on the outer peripheral wall of the air vent, and the third step surface is abutted or connected to the second step surface.

[0024] According to some embodiments of the present application, a cross-sectional area of ​​the second hole section is greater than a cross-sectional area of ​​the first hole section.

[0025] According to some embodiments of the present application, the linear motor includes a seal, a sealing groove is formed on the third step surface, the seal is accommodated in the sealing groove and is in sealing contact with or sealed connection with the second step surface.

[0026] According to some embodiments of the present application, a baffle is provided on the mover assembly, the baffle is located in the first cavity, and the baffle is arranged opposite to the breathable valve and spaced apart from the breathable valve.

[0027] According to some embodiments of the present application, the baffle and the mover assembly are integrally formed.

[0028] According to some embodiments of the present application, the axial direction of the stator assembly extends in the up-down direction, the first cavity is located above the stator assembly, and the second cavity is located below the stator assembly.

[0029] According to some embodiments of the present application, the breathable valve is provided at the upper end of the mover assembly.

[0030] According to some embodiments of the present application, the mover assembly includes a motor housing and a magnet, the magnet is fixed to the inner wall of the motor housing, and the air valve is provided in the motor housing and is located on one axial side of the magnet.

[0031] According to some embodiments of the present application, a communication groove is formed on the inner peripheral wall of the motor housing, and a portion of the communication groove is located in the first cavity and a portion is located in the second cavity.

[0032] According to some embodiments of the present application, the linear motor also includes a dust cover, which is arranged on the outer peripheral side of the mover assembly. The dust cover and the mover assembly jointly define a dust cavity. The first cavity is connected to the dust cavity through a breathable valve. The dust cavity constitutes at least part of the external space of the mover assembly.

[0033] According to some embodiments of the present application, the linear motor includes a stator core shaft, a stator assembly is sleeved on the outer circumference of the stator core shaft and fixed relative to the stator core shaft, a guide channel extending along the axial direction of the stator core shaft is formed on the stator core shaft, and a guide rod extending along the axial direction of the mover assembly is provided on the mover assembly, and the guide rod can be slidably accommodated in the guide channel along the axial direction of the stator assembly.

[0034] The electromagnetic suspension according to the second embodiment of the present application includes: the linear motor according to the first embodiment of the present application.

[0035] According to the electromagnetic suspension of the embodiment of the present application, by setting the above-mentioned linear motor, by connecting at least one of the first cavity and the second cavity located on both sides of the stator assembly with the external space of the mover assembly, the gas in the first cavity and the second cavity can be directly or indirectly exchanged with the air in the external space of the mover assembly, which helps to quickly adjust the pressure in the first cavity and the second cavity, reduce the pressure difference between the first cavity and the second cavity, thereby reducing the reciprocating motion of the linear motor from being affected by the pressure difference and generating thrust fluctuations, thereby reducing energy loss.

[0036] A vehicle according to an embodiment of the third aspect of the present application includes: an electromagnetic suspension according to the embodiment of the second aspect of the present application.

[0037] 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, and by connecting at least one of the first cavity and the second cavity located on both sides of the stator assembly with the external space of the mover assembly, the gas in the first cavity and the second cavity can be directly or indirectly exchanged with the air in the external space of the mover assembly, which helps to quickly adjust the pressure in the first cavity and the second cavity, reduce the pressure difference between the first cavity and the second cavity, thereby reducing the reciprocating motion of the linear motor from being affected by the pressure difference and generating thrust fluctuations, thereby reducing energy loss.

[0038] 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

[0039] 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:

[0040] FIG1 is a cross-sectional view of a linear motor according to some embodiments of the present application;

[0041] Figure 2 is an enlarged view of point A in Figure 1;

[0042] FIG3 is a partial cross-sectional view of the linear motor in FIG1 ;

[0043] FIG4 is an enlarged view of point B in FIG3 ;

[0044] FIG5 is a cross-sectional view of the assembly of the stator assembly and the mover assembly in the linear motor in FIG1 ;

[0045] FIG6 is a schematic diagram of a mover assembly in the linear motor in FIG1 ;

[0046] FIG7 is a schematic diagram of an electromagnetic suspension according to an embodiment of the present application;

[0047] FIG8 is a simplified schematic diagram of a vehicle according to an embodiment of the present application.

[0048] FIGURES: 100, linear motor; 1, stator assembly; 11, connecting cover; 12, stator core shaft; 121, guide channel; 2, mover assembly; 21, first cavity; 211, baffle; 22, second cavity; 23, air gap; 231, breathable valve; 232, valve body; 233, waterproof breathable membrane; 234, ventilation channel; 235, first channel section; 236, second channel section; 237, vent hole; 238, valve body; 239, valve cover; 240, first step surface; 241, third step surface; 242, sealing groove; 251, connecting groove; 26, mounting hole; 261, first hole section; 262, second hole section; 263, ventilation groove; 264, second step surface; 27, motor housing; 28, magnet; 29, guide rod; 31. Seal; 32. Dust cover; 321. Dust chamber; 40. Electromagnetic suspension; 50. Vehicle. DETAILED DESCRIPTION

[0049] 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.

[0050] The linear motor 100 according to an embodiment of the present application is described below with reference to FIG. 1 to FIG. 8 .

[0051] 1 , 3 , and 5 , a linear motor 100 according to an embodiment of the first aspect of the present application includes a stator assembly 1 and a mover assembly 2. When the linear motor 100 is in operation, relative movement between the stator assembly 1 and the mover assembly 2 can occur 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.

[0052] The mover assembly 2 is sleeved on the outer periphery of the stator assembly 1 and a first cavity 21 and a second cavity 22 are defined between the mover assembly 2 and the stator assembly 1. The first cavity 21 and the second cavity 22 are respectively located on both axial sides of the stator assembly 1 to allow the stator assembly 1 and the mover assembly 2 to move relative to each other. The first cavity 21 and the second cavity 22 are both connected to the external space of the mover assembly 2.

[0053] The first cavity 21 and the second cavity 22 are respectively located on both sides of the axial direction of the stator assembly 1, so that the stator assembly 1 and the mover assembly 2 can move relative to each other along the axial direction of the linear motor 100. For example, when the linear motor 100 is working, the mover assembly 2 can reciprocate along the axial direction of the linear motor 100 relative to the stator assembly 1, and the spatial sizes of the first cavity 21 and the second cavity 22 will change, thereby the pressure in the first cavity 21 and the second cavity 22 will also change.

[0054] The first cavity 21 and the second cavity 22 are in communication, and at least one of the first cavity 21 and the second cavity 22 is in communication with the external space of the mover assembly 2, which may include the following situations: for example, the first cavity 21 and the second cavity 22 are both in direct communication with the external space of the mover assembly 2, at which time the air in the first cavity 21 can be directly exchanged with the air in the external space of the mover assembly 2, and the air in the second cavity 22 can be directly exchanged with the air in the external space of the mover assembly 2; for another example, the first cavity 21 is in direct communication with the external space of the mover assembly 2, and the second cavity 22 is in communication with the first cavity 21, so that the second cavity 22 is in direct communication with the mover assembly 2. The external space of the component 2 is indirectly connected, and at this time, the air in the first cavity 21 can be directly exchanged with the air in the external space of the movable component 2, and the air in the second cavity 22 can be indirectly exchanged with the air in the external space of the movable component 2; for another example, the second cavity 22 is directly connected to the external space of the movable component 2, and the first cavity 21 is connected to the second cavity 22, so that the first cavity 21 is indirectly connected to the external space of the movable component 2, and at this time, the air in the second cavity 22 can be directly exchanged with the air in the external space of the movable component 2, and the air in the first cavity 21 can be indirectly exchanged with the air in the external space of the movable component 2.

[0055] Among them, the external space of the mover assembly 2 can be the space located outside the linear motor 100. When the external space of the mover assembly 2 is the space located outside the linear motor 100, the external space of the mover assembly 2 can be part of the external atmospheric space; the external space of the mover assembly 2 can also be the space located inside the linear motor 100. When the external space of the mover assembly 2 is the space located inside the linear motor 100, the external space of the mover assembly 2 can be connected to the external atmosphere, and the external space of the mover assembly 2 can also be separated from the external atmosphere.

[0056] For example, the gas in the external space of the mover assembly 2 can be exchanged with the gas in the first cavity 21 and the second cavity 22, which helps to quickly reduce the pressure difference between the first cavity 21 and the second cavity 22, and reduce the reciprocating motion of the mover assembly 2 being affected by the pressure difference and generating thrust fluctuations, thereby improving the sensitivity of the mover assembly 2 to reciprocate between the first cavity 21 and the second cavity 22.

[0057] Among them, when the linear motor 100 is working, the stator assembly 1 and the mover assembly 2 can generate relative movement along the axial direction of the linear motor 100, 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.

[0058] 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.

[0059] According to the linear motor 100 of the embodiment of the present application, by connecting at least one of the first cavity 21 and the second cavity 22 located on both sides of the stator assembly 1 with the external space of the mover assembly 2, the gas in the first cavity 21 and the second cavity 22 can be directly or indirectly exchanged with the air in the external space of the mover assembly 2, which helps to quickly adjust the pressure in the first cavity 21 and the second cavity 22, reduce the pressure difference between the first cavity 21 and the second cavity 22, thereby reducing the reciprocating motion of the linear motor 100 from being affected by the pressure difference and generating thrust fluctuations, thereby reducing energy loss.

[0060] 1 , 3 and 5 , according to some embodiments of the present application, an air gap 23 is provided between the mover assembly 2 and the stator assembly 1, and the first cavity 21 and the second cavity 22 are connected through the air gap 23, so that the air gap 23 connects the first cavity 21 and the second cavity 22, and the first cavity 21 and the second cavity 22 can exchange gas with each other through the air gap 23, so that the gas in the first cavity 21 and the second cavity 22 flows between the first cavity 21 and the second cavity 22, thereby reducing the pressure difference between the first cavity 21 and the second cavity 22.

[0061] 6 , according to some embodiments of the present application, a connecting groove 251 is provided on the mover assembly 2, and the connecting groove 251 connects the first cavity 21 and the second cavity 22. For example, the connecting groove 251 may be extended along the axial direction of the mover assembly 2, and the two ends of the connecting groove 251 in the length direction are respectively located in the first cavity 21 and the second cavity 22 to connect the first cavity 21 and the second cavity 22, which can increase the gas exchange area between the first cavity 21 and the second cavity 22, thereby accelerating the reduction of the pressure difference between the first cavity 21 and the second cavity 22.

[0062] Optionally, according to one embodiment of the present application, the first cavity 21 and the second cavity 22 can be connected through the air gap 23 and the connecting groove 251, so that the gas exchange area between the first cavity 21 and the second cavity 22 is further increased, thereby further accelerating the reduction of the pressure difference between the first cavity 21 and the second cavity 22.

[0063] 3 and 4 , according to some embodiments of the present application, the mover assembly 2 is provided with a breathable valve 231, which connects the first cavity 21 with the space outside the mover assembly 2. The breathable valve 231 can connect the first cavity 21 with the space outside the mover assembly 2, allowing the gas in the first cavity 21 to exchange with the gas in the space outside the mover assembly 2, thereby facilitating rapid adjustment of the pressure in the first cavity 21.

[0064] 3 and 4 , according to some embodiments of the present application, the vent valve 231 includes a valve body 232 and a waterproof breathable membrane 233. A vent channel 234 is formed in the valve body 232, connecting the first cavity 21 with the external space of the movable subassembly 2. The waterproof breathable membrane 233 is disposed within the vent channel 234. The vent channel 234 facilitates air circulation between the first cavity 21 and the external space of the movable subassembly 2, thereby regulating the pressure within the first cavity 21. Furthermore, the waterproof breathable membrane 233 disposed within the vent channel 234 effectively prevents water from entering the first cavity 21.

[0065] 3 and 4 , according to some embodiments of the present application, the ventilation channel 234 includes a first channel section 235 and a second channel section 236 located on opposite sides of the waterproof and breathable membrane 233. The first channel section 235 is adjacent to the first cavity 21 relative to the second channel section 236, and the first channel section 235 is in communication with the first cavity 21. A vent 237 is formed on the wall of the second channel section 236, connecting the first channel section 235 with the external space of the movable subassembly 2. Gas within the first cavity 21 can sequentially pass through the first channel section 235 and the second channel section 236, and through the vent 237, achieving gas exchange between the first cavity 21 and the external space of the movable subassembly 2, thereby regulating the pressure within the first cavity 21.

[0066] For example, when the linear motor 100 is working, the gas in the first cavity 21 flows into the first channel section 235, and the gas in the first channel section 235 can flow to the external space of the rotor assembly 2 through the vent 237; or the gas in the external space of the rotor assembly 2 flows into the first channel section 235 through the vent 237, and the gas in the first channel section 235 flows into the first cavity 21, completing the process of gas exchange between the gas in the first cavity 21 and the external space of the rotor assembly 2.

[0067] 3 and 4 , according to some embodiments of the present application, the valve body 232 includes a valve main body 238 and a valve cover 239. A vent channel 234 is formed in the valve main body 238. The valve cover 239 is connected to the end of the valve main body 238 away from the first cavity 21 and covers the end of the second channel section 236 away from the waterproof breathable membrane 233. Vent holes 237 are formed in the peripheral wall of the second channel section 236. The valve cover 239 is fixed to the end of the valve main body 238 away from the first cavity 21 to close the vent channel 234. Furthermore, the valve cover 239 covers the end of the second channel section 236 away from the waterproof breathable membrane 233, thereby protecting the waterproof breathable membrane 233 to a certain extent and extending the service life of the waterproof breathable membrane 233.

[0068] Among them, the air vent 237 is formed on the peripheral wall of the second channel section 236, so that gas can flow through the air vent 237. The waterproof and breathable membrane 233 can ensure the effective exchange of gas at the valve body 232, and can also prevent moisture or other liquids from entering the first channel section 235. Therefore, when gas exchange is carried out between the first cavity 21 and the external space of the movable subassembly 2, moisture or other liquids can be prevented from flowing into the first cavity 21 through the first channel section 235.

[0069] 3 and 4 , according to some embodiments of the present application, there are multiple vent holes 237 , and the multiple vent holes 237 are arranged at intervals along the circumference of the second channel section 236 . The multiple vent holes 237 can increase the ventilation area of ​​the valve body 232 , thereby enhancing the effect of gas circulation at the valve body 232 ; and the multiple vent holes 237 are arranged at intervals along the circumference of the second channel section 236 , so that the accumulated water in the second channel can flow out from the vent holes 237 .

[0070] In the description of this application, “plurality” means two or more.

[0071] 3 and 4 , according to some embodiments of the present application, a first stepped surface 240 is formed on the inner wall of the vent channel 234. The first stepped surface 240 is located between the first channel section 235 and the second channel section 236. The waterproof breathable membrane 233 is fixed to the first stepped surface 240. The first stepped surface 240 facilitates the fixing of the waterproof breathable membrane 233 within the vent channel 234 of the valve body 232, making the overall structure of the waterproof breathable membrane 233 and the valve body 232 compact.

[0072] 3 and 4 , according to some embodiments of the present application, the cross-sectional area of ​​the second channel section 236 is greater than that of the first channel section 235, and the waterproof breathable membrane 233 is located within the second channel section 236. Because the waterproof breathable membrane 233 is fixed within the second channel section 236 and the cross-sectional area of ​​the second channel section 236 is greater than that of the first channel section 235, the speed of gas circulation can be accelerated, thereby increasing the gas exchange rate between the first cavity 21 and the space outside the mover assembly 2, and achieving rapid pressure adjustment within the first cavity 21.

[0073] For example, when the gas in the first cavity 21 flows to the external space of the mover assembly 2, the gas in the first cavity 21 flows from the first channel section 235 to the second channel section 236 in the ventilation channel 234. The waterproof and breathable membrane 233 is located in the second channel section 236. The cross-sectional area of ​​the second channel section 236 is greater than the cross-sectional area of ​​the first channel section 235. The increase in the cross-sectional area of ​​the ventilation channel 234 can speed up the gas circulation, thereby improving the gas exchange rate between the first cavity 21 and the external space of the mover assembly 2, and accelerating the pressure regulation in the first cavity 21.

[0074] 3 and 4 , according to some embodiments of the present application, a mounting hole 26 is provided on the mover assembly 2, and the mounting hole 26 includes a first hole section 261 and a second hole section 262 arranged along the axial direction of the mounting hole 26, the first hole section 261 is close to the first cavity 21 relative to the second hole section 262 and is connected to the first cavity 21, the air valve 231 is connected to the first hole section 261, and a ventilation groove 263 connected to the external space of the mover assembly 2 is defined between the outer peripheral wall of the valve body 232 and the inner peripheral wall of the second hole section 262, the ventilation groove 263 is located on the outer peripheral side of the second channel section 236 and the ventilation groove 263 is connected to the second channel section 236 through the ventilation hole 237.

[0075] The breathable valve 231 is connected to the first hole section 261, and the first hole section 261 is communicated with the first cavity 21. The outer peripheral wall of the valve body 232 and the inner peripheral wall of the second hole section 262 define a breathable groove 263 that is communicated with the external space of the movable sub-assembly 2, and the breathable groove 263 is communicated with the second channel section 236 through the breather hole 237, so that the first cavity 21 and the external space of the movable sub-assembly 2 complete gas exchange through the breathable valve 231 to adjust the pressure in the first cavity 21.

[0076] 3 and 4 , according to some embodiments of the present application, the outer peripheral wall of the valve body 232 is spaced apart from the inner peripheral wall of the second hole section 262 to form a vent groove 263. Gas in the external space of the movable subassembly 2 can flow through the vent groove 263, which is spaced apart from the outer peripheral wall of the valve body 232 and the inner peripheral wall of the second hole section 262. For example, the vent groove 263 can be an annular shape extending circumferentially along the inner peripheral wall of the second hole section 262, which can increase the gas area in contact between the valve body 232 and the external space of the movable subassembly 2, thereby improving the efficiency of gas exchange in the first cavity 21 through the vent groove 263, thereby improving the speed of gas exchange between the first cavity 21 and the external space of the movable subassembly 2 through the valve body 232, and realizing rapid regulation of the pressure in the first cavity 21.

[0077] 3 and 4 , according to some embodiments of the present application, the breathable valve 231 is mounted on the peripheral wall of the mover assembly 2, and the breathable valve 231 does not protrude from the outer peripheral wall of the mover assembly 2. The breathable valve 231 is disposed on the peripheral wall of the mover assembly 2 to facilitate rapid flow of gas within the mover assembly 2 through the breathable valve 231 to the external space of the mover assembly 2, thereby accelerating pressure regulation within the mover assembly 2. Furthermore, the breathable valve 231 does not protrude from the outer peripheral wall of the mover assembly 2, making the overall structure of the breathable valve 231 and the mover assembly 2 more compact and preventing interference between the breathable valve 231 and the external structure of the mover assembly 2 due to its protrusion from the outer peripheral wall of the mover assembly 2.

[0078] 3 and 4 , according to some embodiments of the present application, the mover assembly 2 is provided with a mounting hole 26, and a vent valve 231 is mounted in the mounting hole 26. The vent valve 231 is used to connect the first cavity 21 with the external space of the mover assembly 2. The mounting hole 26 facilitates the installation of the vent valve 231 on the mover assembly 2.

[0079] The air valve 231 connects the first cavity 21 with the external space of the mover assembly 2, facilitating the gas exchange between the external space of the mover assembly 2 and the first cavity 21, and is conducive to quickly adjusting the pressure in the first cavity 21; and, the air valve 231 can also play a dustproof and waterproof role, preventing moisture or dust from entering the interior of the mover assembly 2, thereby improving the reliability of the linear motor 100 and extending the service life of the linear motor 100.

[0080] 3 and 4 , according to some embodiments of the present application, the air valve 231 is detachably mounted on the mounting hole 26 , so as to facilitate maintenance or replacement of the air valve 231 .

[0081] 3 and 4 , according to some embodiments of the present application, the air valve 231 is threadedly connected to the mounting hole 26 , which can make the connection between the air valve 231 and the mover assembly 2 simple and highly stable, facilitating the removal or installation of the air valve 231 on the mover assembly 2 .

[0082] 3 and 4 , according to some embodiments of the present application, the mounting hole 26 includes a first hole section 261 and a second hole section 262 arranged along the axial direction of the mounting hole 26. The first hole section 261 is closer to the first cavity 21 relative to the second hole section 262 and is communicated with the first cavity 21. The valve body 232 is connected to the first hole section 261. A second step surface 264 is formed between the first hole section 261 and the second hole section 262. A third step surface 241 is formed on the outer peripheral wall of the air valve 231. The third step surface 241 abuts or is connected to the second step surface 264, which can make the connection between the air valve 231 and the mounting hole 26 simple and have strong stability. Through the cooperation between the third step surface 241 and the second step surface 264, the accurate assembly position between the air valve 231 and the mounting hole 26 can be ensured.

[0083] 3 and 4 , according to some embodiments of the present application, the cross-sectional area of ​​the second hole segment 262 is greater than the cross-sectional area of ​​the first hole segment 261. Because the first hole segment 261 is closer to the first cavity 21 and communicates with the first cavity 21 relative to the second hole segment 262, the cross-sectional area of ​​the second hole segment 262 is greater than the cross-sectional area of ​​the first hole segment 261, which can improve the ease of assembly of the breathable valve 231 at the mounting hole 26.

[0084] 3 and 4 , according to some embodiments of the present application, the linear motor 100 includes a seal 31. A sealing groove 242 is formed on the third stepped surface 241. The seal 31 is accommodated in the sealing groove 242 and is in sealing contact with or connected to the second stepped surface 264. The sealing groove 242 facilitates installation of the seal 31. Accommodating the seal 31 in the sealing groove 242 makes the seal 31 and the linear motor 100 more compact. Furthermore, the sealing contact with or connection between the seal 31 and the second stepped surface 264 enhances the sealing effect between the air vent 231 and the mounting hole 26.

[0085] 3 and 4 , according to some embodiments of the present application, a baffle 211 is provided on the mover assembly 2. The baffle 211 is located within the first cavity 21. The baffle 211 is disposed opposite and spaced from the vent valve 231. The baffle 211 can provide a certain degree of protection for the vent valve 231 by preventing liquid (e.g., oil) within the first cavity 21 from entering the vent valve 231. This can prevent the vent valve 231 from malfunctioning or weakening its ventilation effect due to liquid (e.g., oil) entering the vent valve 231.

[0086] 3 and 4 , according to some embodiments of the present application, the baffle 211 and the mover assembly 2 are integrally formed, which can improve the overall structural strength of the linear motor 100 and eliminate the assembly process between the baffle 211 and the mover assembly 2, thereby improving production efficiency.

[0087] Optionally, according to one embodiment of the present application, the mover assembly 2 may include a motor housing 27, a baffle 211 integrally formed with the motor housing 27, and the baffle 211 is located above the first cavity 21. The baffle 211 is disposed opposite to the breathable valve 231 and is spaced apart from the breathable valve 231. The baffle 211 can provide a certain degree of protection for the breathable valve 231, preventing liquid (e.g., oil) within the first cavity 21 from splashing into the breathable valve 231.

[0088] 1 , 3 and 5 , according to some embodiments of the present application, the axial direction of the stator assembly 1 extends in the up-down direction, the first cavity 21 is located above the stator assembly 1, and the second cavity 22 is located below the stator assembly 1. The liquid (e.g., oil) in the second cavity 22 flows downward under its own gravity. By having the first cavity 21 located above the stator assembly 1 and the second cavity 22 located below the stator assembly 1, the liquid in the second cavity 22 can be prevented from entering the breathable valve 231 connecting the first cavity 21 and the external space of the mover assembly 2, which may cause the breathable valve 231 to malfunction.

[0089] Referring to Figure 3, according to some embodiments of the present application, the air valve 231 is arranged at the upper end of the movable subassembly 2. The liquid (such as oil) inside the movable subassembly 2 can flow downward due to its own gravity, and the gas flows upward due to its own characteristics. By locating the air valve 231 at the upper end of the movable subassembly 2, other substances can be prevented from flowing into the air valve 231 and affecting the ventilation effect of the air valve 231, and the gas can be facilitated to flow through the air valve 231 to the external space of the movable subassembly 2.

[0090] 1 and 3 , according to some embodiments of the present application, the mover assembly 2 includes a motor housing 27 and a magnet 28 , and the magnet 28 is fixed to the inner wall of the motor housing 27 . For example, when the linear motor 100 is working, the magnet 28 and the motor housing 27 move relative to the stator assembly 1 along the axial direction of the linear motor 100 .

[0091] The air valve 231 is provided on the motor housing 27 and is located on one axial side of the magnet 28. The gas inside the motor housing 27 can flow to the outside of the motor housing 27 through the air valve 231, thereby realizing pressure regulation inside the motor housing 27 and preventing the motor housing 27 from being deformed due to excessive internal pressure. Moreover, the air valve 231 is located on one axial side of the magnet 28, thereby preventing the integrity of the magnet 28 from being destroyed due to the installation of the air valve 231, thereby realizing the normal operation of the magnet 28 and the air valve 231 and making the overall structure of the magnet 28 and the air valve 231 compact.

[0092] Optionally, the mover assembly 2 may be a primary assembly and the stator assembly 1 may be a secondary assembly. In this case, the mover assembly 2 includes a motor housing, an iron core and a winding, the iron core is on the inner wall of the motor housing, the winding is arranged on the iron core, and the stator assembly 1 includes a magnet. Alternatively, the mover assembly 2 may be a secondary assembly and the stator assembly 1 may be a primary assembly. The mover assembly 2 includes a motor housing 27 and a magnet 28, the magnet 28 is installed on the inner wall of the motor housing 27, and the stator assembly 1 includes an iron core and a winding, and the winding is installed on the iron core.

[0093] 6 , according to some embodiments of the present application, a connecting groove 251 is formed on the inner peripheral wall of the motor housing 27 , and a portion of the connecting groove 251 is located in the first cavity 21 and a portion of the connecting groove 251 is located in the second cavity 22 , so that the connecting groove 251 connects the first cavity 21 and the second cavity 22 , and the first cavity 21 and the second cavity 22 can exchange gas with each other through the connecting groove 251 , so that the gas in the first cavity 21 and the second cavity 22 flows between the first cavity 21 and the second cavity 22 , thereby accelerating the reduction of the pressure difference between the first cavity 21 and the second cavity 22 .

[0094] 5 and 6 , according to some embodiments of the present application, a plurality of communication grooves 251 are provided, and the plurality of communication grooves 251 are arranged at intervals along the circumference of the motor housing 27. The plurality of communication grooves 251 can increase the communication area between the first cavity 21 and the second cavity 22, thereby accelerating the efficiency of gas flow between the first cavity 21 and the second cavity 22. Furthermore, the plurality of communication grooves 251 are arranged at intervals along the circumference of the motor housing 27, thereby ensuring uniform gas flow between the first cavity 21 and the second cavity 22.

[0095] 1 and 2 , according to some embodiments of the present application, the linear motor 100 further includes a dust cover 32, which is disposed on the outer peripheral side of the mover assembly 2. The dust cover 32 and the mover assembly 2 jointly define a dust chamber 321. The first cavity 21 is connected to the dust chamber 321 via a breathable valve 231, and the dust chamber 321 constitutes at least a portion of the external space of the mover assembly 2. The gas in the first cavity 21 can be exchanged with the gas in the dust chamber 321 to adjust the pressure in the first cavity 21. The dust chamber 321 can effectively prevent other debris (such as dust) from entering the first cavity 21 through the breathable valve 231, thereby extending the service life of the linear motor 100.

[0096] Optionally, according to one embodiment of the present application, the linear motor 100 includes a connecting cover 11, which is located on a side of the mover assembly 2 adjacent to the first cavity 21 and connected to the stator assembly 1. The connecting cover 11 is located on a side of the mover assembly 2 adjacent to the first cavity 21 and the other end of the dust cover 32 is connected to the connecting cover 11. One end of the dust cover 32 is connected to the mover assembly 2, which can effectively prevent other debris (such as dust) from entering the mover assembly 2. The dust cover 32 can protect the mover assembly 2 and the connection between the mover assembly 2 and the stator assembly 1, and can prevent other debris (such as dust) from directly entering the interior of the mover assembly 2 or entering the interior of the mover assembly 2 through the connection between the mover assembly 2 and the stator assembly 1; and the dust cover 32 is retractable along the axial direction of the mover assembly 2, so that the dust cover 32 can adapt to the relative movement of the mover assembly 2 when the linear motor 100 is working, which can improve the protection effect of the mover assembly 2.

[0097] When the linear motor 100 is used in the electromagnetic suspension 40 of the vehicle 50 , the connection cover 11 can be used to connect to the vehicle body, and the lower end of the motor housing 27 can be connected to the wheel.

[0098] 1 and 3 , according to some embodiments of the present application, a linear motor 100 includes a stator core shaft 12, a stator assembly 1 sleeved on the outer periphery of the stator core shaft 12 and fixed relative to the stator core shaft 12, and the stator assembly 1 includes a stator and a winding. A guide channel 121 extending axially along the stator core shaft 12 is formed on the stator core shaft 12, and a guide rod 29 extending axially along the mover assembly 2 is provided on the mover assembly 2. The guide rod 29 is slidably accommodated in the guide channel 121 along the axial direction of the stator assembly 1. The guide rod 29 can guide the movement of the mover assembly 2. Through the cooperation between the guide channel 121 and the guide rod 29, the movement of the guide rod 29 can be guided and limited, ensuring that the guide rod 29 moves along a set direction and a set trajectory, and preventing the guide rod 29 from separating from the stator core shaft 12 during the sliding process.

[0099] 1 and 7 , the electromagnetic suspension 40 according to the second embodiment of the present application includes the linear motor 100 according to the first embodiment of the present application.

[0100] According to the electromagnetic suspension 40 of the embodiment of the present application, by setting the above-mentioned linear motor 100, by connecting at least one of the first cavity 21 and the second cavity 22 located on both sides of the stator assembly 1 with the external space of the mover assembly 2, the gas in the first cavity 21 and the second cavity 22 can be directly or indirectly exchanged with the air in the external space of the mover assembly 2, which helps to quickly adjust the pressure in the first cavity 21 and the second cavity 22, reduce the pressure difference between the first cavity 21 and the second cavity 22, thereby reducing the reciprocating motion of the linear motor 100 from being affected by the pressure difference and generating thrust fluctuations, thereby reducing energy loss.

[0101] 1 and 8 , a vehicle 50 according to an embodiment of the third aspect of the present application includes an electromagnetic suspension 40 according to the embodiment of the second aspect of the present application.

[0102] According to the vehicle 50 of the embodiment of the present application, the above-mentioned electromagnetic suspension 40 is set, and the electromagnetic suspension 40 includes a linear motor 100. By connecting at least one of the first cavity 21 and the second cavity 22 located on both sides of the stator assembly 1 with the external space of the mover assembly 2, the gas in the first cavity 21 and the second cavity 22 can be directly or indirectly exchanged with the air in the external space of the mover assembly 2, which helps to quickly adjust the pressure in the first cavity 21 and the second cavity 22, reduce the pressure difference between the first cavity 21 and the second cavity 22, thereby reducing the reciprocating motion of the linear motor 100 from being affected by the pressure difference and generating thrust fluctuations, thereby reducing energy loss.

[0103] 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.

[0104] 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 linear motor (100), wherein: include: stator assembly (1); A mover assembly (2) is sleeved on the outer periphery of the stator assembly (1) and defines a first cavity (21) and a second cavity (22) between the mover assembly (2) and the stator assembly (1); the first cavity (21) and the second cavity (22) are respectively located on both sides of the axial direction of the stator assembly (1) so as to allow the stator assembly (1) and the mover assembly (2) to move relative to each other; the first cavity (21) is communicated with the second cavity (22); and at least one of the first cavity (21) and the second cavity (22) is communicated with the external space of the mover assembly (2).

2. The linear motor (100) according to claim 1, wherein: An air gap (23) is provided between the mover assembly (2) and the stator assembly (1), and the first cavity (21) and the second cavity (22) are communicated through the air gap (23).

3. The linear motor (100) according to claim 1 or 2, wherein: A communication groove (251) is provided on the movable subassembly (2), and the communication groove (251) communicates the first cavity (21) with the second cavity (22).

4. The linear motor (100) according to any one of claims 1 to 3, wherein: The movable subassembly (2) is provided with a breathable valve (231), and the breathable valve (231) communicates the first cavity (21) with the external space of the movable subassembly (2).

5. The linear motor (100) according to claim 4, wherein: The vent valve (231) comprises a valve body (232) and a waterproof vent membrane (233); a vent channel (234) communicating between the first cavity (21) and the external space of the mover assembly (2) is formed in the valve body (232); and the waterproof vent membrane (233) is disposed in the vent channel (234).

6. The linear motor (100) according to claim 5, wherein: The ventilation channel (234) comprises a first channel section (235) and a second channel section (236) located on opposite sides of the waterproof breathable membrane (233); the first channel section (235) is adjacent to the first cavity (21) relative to the second channel section (236) and is in communication with the first cavity (21); a ventilation hole (237) is formed on a wall of the second channel section (236) for communicating with the first channel section (235) and the external space of the movable subassembly (2).

7. The linear motor (100) according to claim 6, wherein: The valve body (232) includes a valve main body (238) and a valve cover (239), the valve main body (238) is formed with the ventilation channel (234), the valve cover (239) is connected to the end of the valve main body (238) away from the first cavity (21) and covers the end of the second channel section (236) away from the waterproof breathable membrane (233), and the ventilation hole (237) is formed on the peripheral wall of the second channel section (236).

8. The linear motor (100) according to claim 7, wherein: There are a plurality of vent holes (237), and the plurality of vent holes (237) are arranged at intervals along the circumference of the second channel section (236).

9. The linear motor (100) according to claim 6, wherein: The inner wall of the ventilation channel (234) is formed with a first step surface (240), the first step surface (240) is located between the first channel section (235) and the second channel section (236), and the waterproof breathable membrane (233) is fixed to the first step surface (240).

10. The linear motor (100) according to claim 9, wherein: The cross-sectional area of ​​the second channel section (236) is greater than the cross-sectional area of ​​the first channel section (235), and the waterproof and breathable membrane (233) is located in the second channel section (236).

11. The linear motor (100) according to claim 7, wherein: The movable subassembly (2) is provided with a mounting hole (26), and the mounting hole (26) includes a first hole section (261) and a second hole section (262) arranged along the axial direction of the mounting hole (26), the first hole section (261) is close to the first cavity (21) relative to the second hole section (262) and is communicated with the first cavity (21), the valve body (232) is connected to the first hole section (261), and a vent groove (263) communicating with the external space of the movable subassembly (2) is defined between the outer peripheral wall of the valve body (232) and the inner peripheral wall of the second hole section (262), the vent groove (263) is located on the outer peripheral side of the second channel section (236) and is communicated with the second channel section (236) through the vent hole (237).

12. The linear motor (100) according to claim 11, wherein: The outer peripheral wall of the valve body (232) is spaced apart from the inner peripheral wall of the second hole section (262) to form the ventilation groove (263).

13. The linear motor (100) according to claim 4, wherein: The vent valve (231) is mounted on the peripheral wall of the movable subassembly (2), and the vent valve (231) does not protrude from the outer peripheral wall surface of the movable subassembly (2).

14. The linear motor (100) according to claim 4, wherein: The movable subassembly (2) is provided with a mounting hole (26), and the vent valve (231) is mounted on the mounting hole (26); the mounting hole (26) comprises a first hole section (261) and a second hole section (262) arranged along the axial direction of the mounting hole (26); the first hole section (261) is closer to the first cavity (21) relative to the second hole section (262) and is communicated with the first cavity (21); the vent valve (231) is connected to the first hole section (261); a second step surface (264) is formed between the first hole section (261) and the second hole section (262); a third step surface (241) is formed on the outer peripheral wall of the vent valve (231); the third step surface (241) is in contact with or connected to the second step surface (264).

15. The linear motor (100) according to claim 14, wherein: The cross-sectional area of ​​the second hole section (262) is greater than the cross-sectional area of ​​the first hole section (261).

16. The linear motor (100) according to claim 14, wherein: The invention comprises a sealing member (31), a sealing groove (242) is formed on the third step surface (241), the sealing member (31) is accommodated in the sealing groove (242) and is in sealing contact with or sealed connection with the second step surface (264).

17. The linear motor (100) according to claim 4, wherein: A baffle (211) is provided on the movable subassembly (2), the baffle (211) is located in the first cavity (21), and the baffle (211) is arranged opposite to the breathable valve (231) and is spaced apart from the breathable valve (231).

18. The linear motor (100) according to claim 17, wherein: The baffle (211) and the mover assembly (2) are integrally formed.

19. The linear motor (100) according to claim 4, wherein: The axial direction of the stator assembly (1) extends in an up-down direction, the first cavity (21) is located above the stator assembly (1), and the second cavity (22) is located below the stator assembly (1).

20. The linear motor (100) according to claim 19, wherein: The vent valve (231) is provided at the upper end of the mover assembly (2).

21. The linear motor (100) according to claim 4, wherein: The mover assembly (2) comprises a motor housing (27) and a magnetic steel (28), wherein the magnetic steel (28) is fixed to the inner wall of the motor housing (27), and the air vent valve (231) is provided in the motor housing (27) and is located on one axial side of the magnetic steel (28).

22. The linear motor (100) according to claim 21, wherein: A communication groove (251) is formed on the inner peripheral wall of the motor housing (27), and a portion of the communication groove (251) is located in the first cavity (21) and a portion of the communication groove (251) is located in the second cavity (22).

23. The linear motor (100) according to any one of claims 4 to 22, wherein: The invention also includes a dust cover (32), which is arranged on the outer peripheral side of the movable subassembly (2). The dust cover (32) and the movable subassembly (2) jointly define a dustproof cavity (321). The first cavity (21) is connected to the dustproof cavity (321) through the air vent valve (231). The dustproof cavity (321) constitutes at least part of the external space of the movable subassembly (2).

24. The linear motor (100) according to any one of claims 1 to 23, wherein: The linear motor (100) includes a stator core shaft (12), the stator assembly (1) is sleeved on the outer periphery of the stator core shaft (12) and fixed relative to the stator core shaft (12), a guide channel (121) extending along the axial direction of the stator core shaft (12) is formed on the stator core shaft (12), and a guide rod (29) extending along the axial direction of the mover assembly (2) is provided on the mover assembly (2), and the guide rod (29) is slidably accommodated in the guide channel (121) along the axial direction of the stator assembly (1).

25. An electromagnetic suspension (40), wherein: include: A linear motor (100) according to any one of claims 1 to 24.

26. A vehicle (50) wherein: include: The electromagnetic suspension (40) according to claim 25.

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