Linear motor, electromagnetic suspension and vehicle

Abstract

The invention discloses a linear motor, an electromagnetic suspension and a vehicle. The linear motor comprises a stator assembly and a rotor assembly. The rotor assembly is arranged on the periphery of the stator assembly in a sleeving mode, a first cavity and a second cavity are defined between the rotor assembly and the stator assembly, the first cavity and the second cavity are located on the two axial sides of the stator assembly respectively so that the stator assembly and the rotor assembly can move relatively, and the first cavity is communicated with the second cavity. At least one of the first cavity and the second cavity is communicated with the external space of the rotor assembly. According to the linear motor provided by the embodiment of the invention, at least one of the first cavity and the second cavity located at the two sides of the stator assembly is communicated with the external space of the rotor assembly, so that air in the first cavity and the second cavity can be directly or indirectly exchanged with air in the external space of the rotor assembly; the pressure difference between the first cavity and the second cavity is reduced, so that the thrust fluctuation caused by the influence of the pressure difference on the reciprocating motion of the linear motor is reduced.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a linear motor, an electromagnetic suspension and a vehicle. Background Art

[0002] 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. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide 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 thrust fluctuation caused by the reciprocating motion of the linear motor due to the influence of the pressure difference, and reduce energy loss.

[0004] The present invention provides an electromagnetic suspension having the linear motor.

[0005] The present invention also provides a vehicle having the electromagnetic suspension.

[0006] According to the linear motor of the first aspect of the present invention, the linear motor includes: a stator assembly; a mover assembly, which is sleeved 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.

[0007] According to the linear motor of an embodiment of the present invention, 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 and 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.

[0008] According to some embodiments of the present invention, 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.

[0009] According to some embodiments of the present invention, a communication groove is provided on the movable assembly, and the communication groove connects the first cavity and the second cavity.

[0010] According to some embodiments of the present invention, a breathable valve is provided on the mover assembly, and the breathable valve connects the first cavity with the external space of the mover assembly.

[0011] According to some embodiments of the present invention, 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.

[0012] According to some embodiments of the present invention, 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.

[0013] According to some embodiments of the present invention, 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.

[0014] According to some embodiments of the present invention, there are a plurality of ventilation holes, and the plurality of ventilation holes are arranged at intervals along the circumference of the second channel segment.

[0015] According to some embodiments of the present invention, 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.

[0016] According to some embodiments of the present invention, the cross-sectional area of ​​the second channel section is greater than the cross-sectional area of ​​the first channel section, and the waterproof and breathable membrane is located in the second channel section.

[0017] According to some embodiments of the present invention, a mounting hole is provided on the movable subassembly, and the mounting hole includes a first hole section and a second hole section arranged along the axial direction of the mounting hole, the first hole section is close to the first cavity relative to the second hole section and is connected to the first cavity, the valve body is connected to the first hole section, 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 section, and the ventilation groove is located on the outer peripheral side of the second channel section and is connected to the second channel section through the ventilation hole.

[0018] According to some embodiments of the present invention, the outer peripheral wall of the valve body is spaced apart from the inner peripheral wall of the second hole section to form a vent groove.

[0019] According to some embodiments of the present invention, the breathable valve is installed on the peripheral wall of the movable subassembly, and the breathable valve does not protrude from the peripheral wall surface of the movable subassembly.

[0020] According to some embodiments of the present invention, a mounting hole is provided on the movable subassembly, and the air vent valve 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 valve 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 valve, and the third step surface is abutted or connected to the second step surface.

[0021] According to some embodiments of the present invention, a cross-sectional area of ​​the second hole section is greater than a cross-sectional area of ​​the first hole section.

[0022] According to some embodiments of the present invention, 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.

[0023] According to some embodiments of the present invention, 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.

[0024] According to some embodiments of the present invention, the baffle is integrally formed with the mover assembly.

[0025] According to some embodiments of the present invention, the axial direction of the stator assembly extends in an up-down direction, the first cavity is located above the stator assembly, and the second cavity is located below the stator assembly.

[0026] According to some embodiments of the present invention, the breathable valve is provided at the upper end of the mover assembly.

[0027] According to some embodiments of the present invention, 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.

[0028] According to some embodiments of the present invention, 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.

[0029] According to some embodiments of the present invention, the linear motor further 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, and the dust cavity constitutes at least part of the external space of the mover assembly.

[0030] According to some embodiments of the present invention, 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.

[0031] An electromagnetic suspension according to an embodiment of a second aspect of the present invention includes: a linear motor according to an embodiment of the first aspect of the present invention.

[0032] According to the electromagnetic suspension of an embodiment of the present invention, by setting the above-mentioned linear motor, at least one of the first cavity and the second cavity located on both sides of the stator assembly is connected to 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.

[0033] A vehicle according to an embodiment of a third aspect of the present invention includes: an electromagnetic suspension according to an embodiment of the second aspect of the present invention.

[0034] According to the vehicle of an embodiment of the present invention, 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.

[0035] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0037] Figure 1 is a cross-sectional view of a linear motor according to some embodiments of the present invention;

[0038] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0039] Figure 3yes Figure 1 A partial cross-sectional view of the linear motor in FIG;

[0040] Figure 4 yes Figure 3 Enlarged view of point B in the middle;

[0041] Figure 5 yes Figure 1 A cross-sectional view of the assembly of the stator assembly and the mover assembly in the linear motor;

[0042] Figure 6 yes Figure 1 Schematic diagram of the mover assembly in the linear motor;

[0043] Reference numerals:

[0044] 100. Linear motor;

[0045] 1. stator assembly; 11. connection cover; 12. stator core shaft; 121. guide channel;

[0046] 2. Mover assembly; 21. First cavity; 211. Baffle; 22. Second cavity; 23. Air gap;

[0047] 231. Breathable valve; 232. Valve body; 233. Waterproof breathable membrane; 234. Ventilation channel; 235. First channel section; 236. Second channel section; 237. Ventilation hole; 238. Valve body; 239. Valve cover; 240. First step surface; 241. Third step surface; 242. Sealing groove;

[0048] 251, connecting groove; 26, mounting hole; 261, first hole section; 262, second hole section; 263, ventilation groove; 264, second step surface;

[0049] 27. Motor housing; 28. Magnet; 29. ​​Guide rod;

[0050] 31. Seal; 32. Dust cover; 321. Dust chamber. DETAILED DESCRIPTION

[0051] The following describes embodiments of the present invention in detail. 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 intended only to explain the present invention and are not to be construed as limiting the present invention.

[0052] Reference below Figures 1-6 A linear motor 100 according to an embodiment of the present invention will be described.

[0053] Reference Figure 1 、 Figure 3 and Figure 5 According to a linear motor 100 according to an embodiment of the first aspect of the present invention, the linear motor 100 includes a stator assembly 1 and a mover assembly 2. When the linear motor 100 is in operation, the stator assembly 1 and the mover assembly 2 can generate relative movement along the axial direction of the linear motor 100. When the linear motor 100 is used in an electromagnetic suspension system for a vehicle, the stator assembly 1 can be connected to the vehicle body, and the mover assembly 2 can be connected to the wheel. 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 wheel.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] According to the linear motor 100 of an embodiment of the present invention, 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.

[0062] Reference Figure 1 、 Figure 3 and Figure 5According to some embodiments of the present invention, 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. The first cavity 21 and the second cavity 22 can exchange gas with each other through the air gap 23, which facilitates the gas in the first cavity 21 and the second cavity 22 to flow 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.

[0063] Reference Figure 6 According to some embodiments of the present invention, a connecting groove 251 is provided on the movable subassembly 2, and the connecting groove 251 connects the first cavity 21 and the second cavity 22. For example, the connecting groove 251 can be extended along the axial direction of the movable subassembly 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.

[0064] Optionally, according to one embodiment of the present invention, 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.

[0065] Reference Figure 3 and Figure 4 According to some embodiments of the present invention, a breathable valve 231 is provided on the mover assembly 2, 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, so that the gas in the first cavity 21 can be exchanged with the gas in the space outside the mover assembly 2, thereby facilitating rapid adjustment of the pressure in the first cavity 21.

[0066] Reference Figure 3 and Figure 4 According to some embodiments of the present invention, 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.

[0067] Reference Figure 3 and Figure 4 According to some embodiments of the present invention, 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 and the first cavity 21 are connected. 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.

[0068] 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.

[0069] Reference Figure 3 and Figure 4 According to some embodiments of the present invention, 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. A vent hole 237 is 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, which can provide some protection for the waterproof breathable membrane 233 and thus extend the service life of the waterproof breathable membrane 233.

[0070] 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.

[0071] Reference Figure 3 and Figure 4According to some embodiments of the present invention, 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 gas circulation effect 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.

[0072] In the description of the present invention, "plurality" means two or more.

[0073] Reference Figure 3 and Figure 4 According to some embodiments of the present invention, 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.

[0074] Reference Figure 3 and Figure 4 According to some embodiments of the present invention, 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.

[0075] 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.

[0076] Reference Figure 3 and Figure 4According to some embodiments of the present invention, a mounting hole 26 is provided on the movable subassembly 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 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 ventilation groove 263 is located on the outer peripheral side of the second channel section 236 and is connected to the second channel section 236 through the ventilation hole 237.

[0077] 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.

[0078] Reference Figure 3 and Figure 4 According to some embodiments of the present invention, 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 with 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 adjustment of the pressure in the first cavity 21.

[0079] Reference Figure 3 and Figure 4 According to some embodiments of the present invention, the breather valve 231 is mounted on the peripheral wall of the mover assembly 2, and the breather valve 231 does not protrude from the outer peripheral wall of the mover assembly 2. The breather 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 breather valve 231 to the external space of the mover assembly 2, thereby accelerating pressure regulation within the mover assembly 2. Furthermore, the breather valve 231 does not protrude from the outer peripheral wall of the mover assembly 2, making the overall structure of the breather valve 231 and the mover assembly 2 more compact and preventing interference between the breather 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.

[0080] Reference Figure 3 and Figure 4According to some embodiments of the present invention, the movable subassembly 2 is provided with a mounting hole 26, and the 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 movable subassembly 2. The mounting hole 26 can facilitate the installation of the vent valve 231 on the movable subassembly 2.

[0081] 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.

[0082] Reference Figure 3 and Figure 4 According to some embodiments of the present invention, the air valve 231 is detachably mounted on the mounting hole 26 , so as to facilitate maintenance or replacement of the air valve 231 .

[0083] Reference Figure 3 and Figure 4 According to some embodiments of the present invention, the air valve 231 is threadedly connected to the mounting hole 26, which can make the connection between the air valve 231 and the movable subassembly 2 simple and have strong stability, and facilitate the disassembly or installation of the air valve 231 on the movable subassembly 2.

[0084] Reference Figure 3 and Figure 4 According to some embodiments of the present invention, 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 method 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.

[0085] Reference Figure 3 and Figure 4According to some embodiments of the present invention, 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 convenience of assembling the breathable valve 231 at the mounting hole 26.

[0086] Reference Figure 3 and Figure 4 According to some embodiments of the present invention, 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 valve 231 and the mounting hole 26.

[0087] Reference Figure 3 and Figure 4 According to some embodiments of the present invention, the mover assembly 2 is provided with a baffle 211. The baffle 211 is located within the first cavity 21. The baffle 211 is disposed opposite the vent valve 231 and is spaced apart 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.

[0088] Reference Figure 3 and Figure 4 According to some embodiments of the present invention, 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.

[0089] Optionally, according to one embodiment of the present invention, 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.

[0090] Reference Figure 1 、 Figure 3 and Figure 5 According to some embodiments of the present invention, 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 (such as 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.

[0091] Reference Figure 3 According to some embodiments of the present invention, 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.

[0092] Reference Figure 1 and Figure 3 According to some embodiments of the present invention, 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 produce relative movement relative to the stator assembly 1 along the axial direction of the linear motor 100.

[0093] 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.

[0094] 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.

[0095] Reference Figure 6According to some embodiments of the present invention, a connecting groove 251 is formed on the inner peripheral wall of the motor housing 27. Part of the connecting groove 251 is located in the first cavity 21 and part 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. The first cavity 21 and the second cavity 22 can exchange gas with each other through the connecting groove 251, which facilitates the gas in the first cavity 21 and the second cavity 22 to flow 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.

[0096] Reference Figure 5 and Figure 6 According to some embodiments of the present invention, there are multiple communication grooves 251, and the multiple communication grooves 251 are arranged at intervals along the circumference of the motor housing 27. The multiple communication grooves 251 can increase the communication area between the first cavity 21 and the second cavity 22, thereby accelerating the efficiency of gas circulation between the first cavity 21 and the second cavity 22; and the multiple communication grooves 251 are arranged at intervals along the circumference of the motor housing 27, so that the gas between the first cavity 21 and the second cavity 22 can flow evenly.

[0097] Reference Figure 1 and Figure 2 According to some embodiments of the present invention, the linear motor 100 further includes a dust cover 32, which is disposed on the outer periphery of the mover assembly 2. The dust cover 32 and the mover assembly 2 together define a dust chamber 321. The first cavity 21 communicates with the dust chamber 321 via a breathable valve 231, and the dust chamber 321 constitutes at least part of the external space of the mover assembly 2. Gas within the first cavity 21 can be exchanged with gas within the dust chamber 321 to regulate the pressure within the first cavity 21. Furthermore, the dust chamber 321 can effectively prevent other debris (e.g., dust) from entering the first cavity 21 through the breathable valve 231, thereby extending the service life of the linear motor 100.

[0098] Optionally, according to one embodiment of the present invention, 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.

[0099] When the linear motor 100 is used for an electromagnetic suspension of a vehicle, 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.

[0100] Reference Figure 1 and Figure 3 According to some embodiments of the present invention, a linear motor 100 includes a stator core shaft 12, a stator assembly 1 is 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 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. 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, a guiding and limiting function can be provided for the movement of the guide rod 29, 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.

[0101] Reference Figure 1 The electromagnetic suspension according to the second embodiment of the present invention includes the linear motor 100 according to the first embodiment of the present invention.

[0102] According to the electromagnetic suspension of an embodiment of the present invention, 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.

[0103] Reference Figure 1 The vehicle according to the third embodiment of the present invention includes the electromagnetic suspension according to the second embodiment of the present invention.

[0104] According to the vehicle of an embodiment of the present invention, by setting the above-mentioned electromagnetic suspension, the electromagnetic suspension includes a linear motor 100, and 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.

[0105] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0106] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A linear motor, characterized in that: include: stator assembly; The movable assembly is sleeved on the outer circumference of the stator assembly and defines a first cavity and a second cavity between the movable assembly and the stator assembly. The first cavity and the second cavity are respectively located on both sides of the axial direction of the stator assembly to allow the stator assembly and the movable 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 directly or indirectly connected to the external space of the movable assembly.

2. The linear motor according to claim 1, wherein: At least one of the first cavity and the second cavity is directly or indirectly connected to an external space of the mover assembly to reduce a pressure difference between the first cavity and the second cavity.

3. The linear motor according to claim 1, wherein: It also includes a dust cover, which is arranged on the outer peripheral side of the movable subassembly. The dust cover and the movable subassembly jointly define a dust cavity. The first cavity is connected to the dust cavity. The dust cavity constitutes at least part of the external space of the movable subassembly.

4. The linear motor according to claim 3, characterized in that It also includes a connecting cover, which is located on a side of the movable assembly adjacent to the first cavity and connected to the stator assembly. One end of the dust cover is connected to the movable assembly, and the other end of the dust cover is connected to the connecting cover.

5. The linear motor according to claim 3, characterized in that The first cavity is communicated with the dustproof cavity through a breathable valve. 6 . The linear motor according to claim 1 , wherein a connecting groove is provided on the mover assembly, and the connecting groove connects the first cavity and the second cavity.

7. The linear motor according to claim 1, wherein: The movable subassembly is provided with a ventilation valve, which connects the first cavity with the external space of the movable subassembly.

8. The linear motor according to claim 7, characterized in that: The breathable valve includes a valve body and a waterproof breathable membrane. A ventilation channel is formed in the valve body to connect the first cavity and the external space of the movable subassembly. The waterproof breathable membrane is arranged in the ventilation channel.

9. The linear motor according to claim 8, characterized in that 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. 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.

10. The linear motor according to claim 9, characterized in that The valve body includes a valve main body and a valve cover, the 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.

11. The linear motor according to claim 10, characterized in that There are a plurality of vent holes, and the vent holes are arranged at intervals along the circumference of the second channel segment.

12. The linear motor according to claim 9, characterized in that 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. The waterproof breathable membrane is fixed to the first step surface.

13. The linear motor according to claim 12, characterized in that: The cross-sectional area of ​​the second channel section is greater than the cross-sectional area of ​​the first channel section, and the waterproof breathable membrane is located in the second channel section.

14. The linear motor according to claim 10, characterized in that The movable subassembly is provided with a mounting hole, and the mounting hole includes a first hole section and a second hole section arranged along the axial direction of the mounting hole. The first hole section is close to the first cavity relative to the second hole section and is connected to the first cavity. The valve body is connected to the first hole section, 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 section. The ventilation groove is located on the outer peripheral side of the second channel section and is connected to the second channel section through the ventilation hole.

15. The linear motor according to claim 7, characterized in that 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.

16. The linear motor according to claim 7, characterized in that The movable subassembly is provided with a mounting hole, and the air valve is mounted on 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 valve 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 valve, and the third step surface abuts or is connected to the second step surface.

17. The linear motor according to claim 16, characterized in that The cross-sectional area of ​​the second hole segment is greater than the cross-sectional area of ​​the first hole segment.

18. The linear motor according to claim 16, characterized in that A sealing member is included. A sealing groove is formed on the third step surface. The sealing member is accommodated in the sealing groove and is in sealing contact with or sealed connection with the second step surface.

19. The linear motor according to claim 8, characterized in that A baffle is provided on the movable subassembly. The baffle is located in the first cavity. The baffle is arranged opposite to the breathable valve and is spaced apart from the breathable valve.

20. The linear motor according to claim 19, wherein: The baffle and the mover assembly are integrally formed.

21. The linear motor according to claim 7, characterized in that The mover assembly includes a motor housing and a magnet, wherein 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.

22. The linear motor according to claim 21, characterized in that A communication groove is formed on the inner peripheral wall of the motor housing. Part of the communication groove is located in the first cavity and part of the communication groove is located in the second cavity.

23. The linear motor according to any one of claims 1 to 22, characterized in that: The linear motor includes a stator core shaft, the 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 the movable assembly is provided with a guide rod extending along the axial direction of the movable assembly, and the guide rod is slidably accommodated in the guide channel along the axial direction of the stator assembly.

24. An electromagnetic suspension, characterized in that: include: A linear motor according to any one of claims 1 to 23.

25. A vehicle, characterized in that: include: The electromagnetic suspension according to claim 24.

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