Direct-current brushless slide rail motor and automobile seat

Abstract

According to the direct-current brushless sliding rail motor and the automobile seat, the rotor iron core in the rotor assembly is arranged close to the upper end cover or the lower end cover, the two ends of the rotor rotating shaft are connected with the upper end bearing on the upper end cover and the lower end bearing of the lower end cover, and the rotor assembly is sleeved with the stator assembly. The rotor core is close to any end of the rotor rotating shaft on the rotor rotating shaft, so that the rotor core is staggered relative to the stator assembly, the rotor assembly generates an axial magnetic pulling force, the rotor rotating shaft moves towards one end, one end of the rotor assembly is in contact friction with the upper end bearing or the lower end bearing, and the other end is in a suspended state; a certain distance is kept between the lower end bearing and the upper end bearing, so that one end of the rotor rotating shaft has no friction sound, half of the friction sound is reduced, and the noise reduction effect is achieved.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a brushless DC slide rail motor and a car seat. Background Art

[0002] The car seat frame is the core component of the car seat. It provides the necessary support for the passenger's body, ensures stability and comfort during driving, and allows passengers to adjust the seat position (such as front and back, height, tilt angle, etc.) according to personal needs to achieve the best sitting posture. The electric adjustment system of the car seat includes adjustments such as front and back, height, and tilt. The slide rail motor is one of the components, which is responsible for driving the seat to move on the slide rail so that the car seat can be adjusted in the front and back direction.

[0003] Most of the existing car seat slide motors on the market are brushed motors, which are prone to produce loud noise when used in cars. The noise makes users feel uncomfortable when using them, affecting the user experience. Summary of the invention

[0004] The technical problem to be solved by the present application is that most of the existing automobile seat slide rail motors on the market are brushed motors, which are prone to produce loud noise when used in the car. The noise makes the user feel uncomfortable when using it, affecting the user's experience.

[0005] In order to solve the above problems, in order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a brushless DC slide rail motor and a car seat.

[0006] In a first aspect, the present invention discloses a brushless DC slide rail motor, which comprises an upper end cover, an upper end bearing, a lower end cover, a lower end bearing, a rotor assembly, and a stator assembly, wherein two ends of the rotor assembly are respectively connected to the upper end cover and the lower end cover, and the stator assembly is arranged around the rotor assembly;

[0007] The upper end bearing is installed at the center of the upper end cover, and the lower end bearing is installed at the center of the lower end cover;

[0008] The rotor assembly comprises a rotor shaft and a rotor core, wherein the rotor core is sleeved on the rotor shaft, two ends of the rotor shaft are respectively connected to the upper end bearing and the lower end bearing, and the rotor core is arranged close to the upper end bearing or the lower end bearing;

[0009] The rotor core and the stator assembly are arranged in a relatively staggered manner, and any end of the rotor shaft is close to the upper end cover or the lower end cover.

[0010] Preferably, the upper end cover is provided with a first fixing claw, and the upper end bearing is installed in the first fixing claw;

[0011] The lower end cover is provided with a second fixing claw, and the lower end bearing is installed in the second fixing claw.

[0012] Preferably, the rotor assembly comprises a graphite gasket, a positioning ring, and a silicone gasket, wherein the graphite gasket, the silicone gasket and the positioning ring are sleeved on the rotor shaft, and the positioning ring is interference-connected with the rotor shaft;

[0013] The positioning ring is close to the rotor core, the graphite gasket is close to the upper end cover or the lower end cover, and the silicone gasket is arranged between the graphite gasket and the positioning ring.

[0014] Preferably, the stator assembly comprises a stator core and a winding coil, and the winding coil is connected to the stator core.

[0015] Preferably, the stator assembly comprises a bobbin, and the bobbin is arranged between the stator core and the winding coil.

[0016] Preferably, it comprises an outer peripheral shell, the outer peripheral shell is arranged on the outer peripheral side of the stator assembly, and the upper end cover and the lower end cover are arranged at two ends of the outer peripheral shell respectively;

[0017] The outer peripheral shell is interference-fitted with the stator core.

[0018] Preferably, it comprises a circuit assembly, wherein the circuit assembly is electrically connected to the stator assembly, and the circuit assembly is connected to the lower end cover.

[0019] Preferably, the circuit assembly includes a Hall sensor and a temperature-controlled switch, the Hall sensor is connected to the temperature-controlled switch, and the Hall sensor is used to sense the position of the rotor core.

[0020] Preferably, the circuit assembly comprises a connector, and the connector is respectively connected to the winding coil and the temperature control switch.

[0021] In a second aspect, the present invention discloses a car seat, which comprises the above-mentioned DC brushless slide rail motor.

[0022] The above technical solution provided by this application has the following advantages compared with the prior art:

[0023] The present application provides a DC brushless slide rail motor and a car seat. The DC brushless slide rail motor mentions that the rotor core in the rotor assembly is arranged close to the upper end cover or the lower end cover, and the two ends of the rotor shaft are connected to the upper end bearing on the upper end cover and the lower end bearing of the lower end cover. The stator assembly is sleeved on the outside of the rotor assembly, and the rotor core is close to any end of the rotor shaft on the rotor shaft, so that the rotor core is misaligned relative to the stator assembly. The rotor assembly generates an axial magnetic pulling force, and the rotor shaft moves toward one end. One end of the rotor assembly contacts and rubs with the upper end bearing or the lower end bearing, and the other end is in a suspended state, maintaining a certain distance from the lower end bearing or the upper end bearing, so that there is no friction sound at one end of the rotor shaft, and the friction sound is reduced by half, thereby achieving the effect of noise reduction.

[0024] The car seat mentioned that it uses a DC brushless slide rail motor. The rotor core inside the motor is staggered relative to the stator assembly. During operation, the rotor assembly generates an axial magnetic pull, causing the rotor shaft to move to one end. One end of the rotor assembly is in contact and friction with the upper bearing or the lower bearing, and the other end is in a suspended state, maintaining a certain distance from the lower bearing or the upper bearing, so that there is no friction sound at one end of the rotor shaft, reducing the friction sound by half, achieving a noise reduction effect, and the noise emitted by the car seat during operation is smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0027] Figure 1 A schematic diagram of the structure of a brushless DC slide motor provided in this application;

[0028] Figure 2 Schematic diagram of the explosion structure of a brushless DC slide motor provided in this application Figure 1 ;

[0029] Figure 3 A use state diagram of a brushless DC slide motor provided in this application;

[0030] Figure 4 Schematic diagram of the explosion structure of a brushless DC slide motor provided in this application Figure 2 ;

[0031] Figure 5 for Figure 4 Enlarged schematic diagram at the middle Q;

[0032] Figure 6 A schematic diagram of an exploded structure of a rotor assembly of a brushless DC slide motor provided in the present application;

[0033] Figure 7 A schematic diagram of the exploded structure of a stator assembly of a brushless DC slide motor provided in the present application;

[0034] Figure 8 A schematic diagram of the connection structure of an upper end cover, a lower end cover, a rotor assembly and a stator assembly of a brushless DC slide rail motor provided in the present application;

[0035] Fig. 9 A schematic diagram of the connection structure of a lower end cover, a circuit assembly, and a rotor assembly of a brushless DC slide rail motor provided in the present application;

[0036] Fig.10 A circuit diagram of a circuit assembly of a brushless DC slide motor provided in this application.

[0037] Description of reference numerals:

[0038] 1. Brushless DC slide motor;

[0039] 11. rotor assembly; 111. magnet; 112. rotor shaft; 113. rotor core; 114. graphite gasket; 115. positioning ring; 116. silicone gasket;

[0040] 12. stator assembly; 121. bobbin; 1211. baffle; 122. stator core; 123. winding coil;

[0041] 13. Upper end cover; 131. First fixing claw; 132. Riveting interface;

[0042] 14. Upper bearing; 141. Oil storage tank;

[0043] 15. Lower end cover; 151. Second fixed claw;

[0044] 16. Lower end bearing;

[0045] 17. Outer shell; 171. Riveted structure;

[0046] 18. Circuit assembly; 181. Hall sensor; 182. Temperature control switch; 183. Connector; 184. PCB board. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0048] First, see Figure 1-10 The present invention discloses a brushless DC slide rail motor 1, comprising an upper end cover 13, a lower end cover 15, an outer shell 17, a rotor assembly 11, and a stator assembly 12. The upper end cover 13 and the lower end cover 15 are arranged at both ends of the outer shell 17. The outer shell 17 is cylindrical in shape, and the inner part of the outer shell 17 is hollow, and the two ends are also hollow. The upper end cover 13 and the lower end cover 15 are buckled at both ends of the outer shell 17 to seal the inner part of the outer shell 17. The rotor assembly 11 and the stator assembly 12 are arranged in the outer shell 17. The outer shell 17 is arranged on the outer peripheral side of the stator assembly 12, and the outer shell 17 and the stator assembly 12 are interference fit.

[0049] The two ends of the rotor assembly 11 are connected to the upper end cover 13 and the lower end cover 15 , and penetrate the upper end cover 13 and the lower end cover 15 to be exposed to the outside of the outer shell 17 . The stator assembly 12 is arranged around the rotor assembly 11 , and the rotor assembly 11 rotates inside the stator assembly 12 .

[0050] Among them, riveting structures 171 are set on the edges of both ends of the outer shell 17, and riveting ports 132 are set on the edges of the upper end cover 13 and the lower end cover 15. The installation between the outer shell 17 and the upper end cover 13 and the lower end cover 15 is achieved through the riveting structure 171 and the riveting port 132, which can improve the connection stability between the upper end cover 13 and the lower end cover 15. In addition, subsequent internal maintenance can be carried out by opening the riveting structure 171 to maintain the interior, and product maintenance is more convenient.

[0051] In particular, the outer shell 17 is rolled into a round shell by a thin plate, and the junction is staggered by riveting. There are 7 rivet ports 132 and a wire outlet on the outer shell 17. The outer shell 17 made by this process method can be made into a more suitable motor installation structure.

[0052] The brushless DC slide motor 1 comprises an upper bearing 14 and a lower bearing 16 . The upper bearing 14 is mounted at the center of the upper end cover 13 , and the lower bearing 16 is mounted at the center of the lower end cover 15 .

[0053] Specifically, a first fixing claw 131 is set at the center position of the upper end cover 13, and a second fixing claw 151 is set at the center position of the lower end cover 15. The first fixing claw 131 matches the shape of the upper end bearing 14, and the second fixing claw 151 matches the shape of the lower end bearing 16. The upper end bearing 14 is clamped on the first fixing claw 131, and the lower end bearing 16 is clamped on the second fixing claw 151, so that the upper end bearing 14 is fixed in the first fixing claw 131, and the lower end bearing 16 is fixed in the second fixing claw 151.

[0054] It can be understood that the clamping position of the first fixed claw 131 and the second fixed claw 151 is the bearing chamber, and the upper end bearing 14 and the lower end bearing 16 are directly pressed into the bearing chamber of the upper end cover 13 or the lower end cover 15, and are held by the first fixed claw 131 and the second fixed claw 151, so that the upper end bearing 14 and the lower end bearing 16 can swing and align in the bearing chamber of the upper end cover 13 and the lower end cover 15, while limiting the displacement of the upper end bearing 14 and the lower end bearing 16. Further, after the motor is running, the upper end bearing 14 and the lower end bearing 16 will be automatically adjusted to an axis under the force of the rotor shaft 112, so that the motor runs smoothly without interference.

[0055] The rotor assembly 11 includes a magnet 111, a rotor shaft 112 and a rotor core 113. The rotor core 113 is sleeved on the rotor shaft 112. The two ends of the rotor shaft 112 are respectively connected to the upper bearing 14 and the lower bearing 16. The rotor core 113 is arranged close to the upper bearing 14 or the lower bearing 16, wherein the center of the upper bearing 14 is provided with an opening, and the shape and size of the opening match the two ends of the rotor shaft 112. The upper bearing 14 and the lower bearing 16 are press-fitted to the two ends of the rotor shaft 112. The rotor core 113 and the stator assembly 12 are arranged in a relative offset manner, and any end of the rotor shaft 112 is close to the upper end cover 13 or the lower end cover 15. The magnet 111 has a cylindrical shape, and the magnet 111 is sleeved on the outside of the rotor core 113. The inside of the magnet 111 is assembled with the rotor core 113 by structural adhesive.

[0056] Specifically, the rotor core 113 in the rotor assembly 11 is arranged close to the upper end cover 13 or the lower end cover 15, and the two ends of the rotor shaft 112 are connected to the upper end bearing 14 on the upper end cover 13 and the lower end bearing 16 of the lower end cover 15. The stator assembly 12 is sleeved on the outside of the rotor assembly 11, and the rotor core 113 is close to any end of the rotor shaft 112 on the rotor shaft 112, so that the rotor core 113 is misaligned relative to the stator assembly 12, and the rotor assembly 11 generates an axial magnetic pulling force, and the rotor shaft 112 moves toward one end. One end of the rotor assembly 11 is in contact and friction with the upper end bearing 14 or the lower end bearing 16, and the other end is in a suspended state, keeping a certain distance from the lower end bearing 16 or the upper end bearing 14, so that there is no friction sound at one end of the rotor shaft 112, and the friction sound is reduced by half, thereby achieving the effect of noise reduction.

[0057] The rotor assembly 11 includes a graphite gasket 114, a positioning ring 115, and a silicone gasket 116. The graphite gasket 114, the silicone gasket 116, and the positioning ring 115 are sleeved on the rotor shaft 112. The positioning ring 115 is interference-connected with the rotor shaft 112. The positioning ring 115 is close to the rotor core 113, the graphite gasket 114 is close to the upper end cover 13 or the lower end cover 15, and the silicone gasket 116 is arranged between the graphite gasket 114 and the positioning ring 115.

[0058] Specifically, graphite gaskets 114, positioning rings 115, and silicone gaskets 116 are arranged at both ends of the rotor shaft 112. Due to the action of the axial magnetic pulling force, the rotor shaft 112 moves toward one end, and the positioning ring 115 moves together with the rotor shaft 112. The positioning ring 115 approaches the upper end bearing 14 or the lower end bearing 16. Since the upper end bearing 14 and the opening of the upper end bearing 14 are inserted into the two ends of the rotor shaft 112, the rotor core 113 is subjected to the axial magnetic pulling force, and the rotor shaft 112 moves to the upper end bearing 14 or the lower end bearing 16. When the rotor shaft 112 moves close to the upper end cover 13 or the lower end cover 15, the positioning ring 115 is fixed on the rotor shaft 112, and the graphite gasket 114 at one end continues to press against the surface of the upper end bearing 14 or the lower end bearing 16 under the force applied by the positioning ring 115. The two rotate relative to each other and rub against each other to produce noise. Since the distance between the graphite gasket 114 at the other end and the bearing becomes larger and is in a suspended state, the two cannot rub against each other and produce noise, thereby achieving the purpose of reducing noise. In addition, since the graphite gasket 114 and the silicone gasket 116 are arranged between the positioning ring 115 and the rotor bearing, the silicone gasket 116 can absorb the axial vibration of the rotor shaft 112, which causes the rotor assembly 11 to be subjected to the periodic vibration transmitted by the magnetic field force. The silicone gasket 116 can weaken the noise transmitted by the rotor assembly 11, thereby reducing the overall noise of the motor.

[0059] It can be understood that since the rotor shaft 112 moves toward one end, the graphite gasket 114 at one end contacts and rubs against the upper bearing 14 or the lower bearing 16, and the graphite gasket 114 at the other end is at a distance from the upper bearing 14 or the lower bearing 16, thereby reducing the friction sound by half. The silicone gasket 116 on the graphite gasket 114 can further eliminate the periodic vibration of the rotor assembly 11 transmitted by the magnetic field force, thereby isolating the noise transmission path and meeting the low noise requirement.

[0060] In this embodiment, the rotor core 113 is arranged close to the lower end cover 15, so that the stator assembly 12 and the rotor assembly 11 are misaligned with each other, and the rotor assembly 11 generates an axial magnetic pulling force close to the lower end cover 15, so that the rotor assembly 11 moves toward the lower end cover 15.

[0061] In particular, the upper bearing 14 and the lower bearing 16 are provided with an oil storage tank 141. During installation, lubricating oil or grease needs to be applied to the oil storage tank 141 to make the upper bearing 14 or the lower bearing 16 rotate more smoothly relative to the graphite gasket 114. The friction generated when the upper bearing 14 and the lower bearing 16 rotate relative to the graphite gasket 114 can be reduced, thereby reducing the noise. At the same time, the service life of the graphite gasket 114, the upper bearing 14 and the lower bearing 16 can also be extended.

[0062] The stator assembly 12 includes a bobbin 121 , a stator core 122 and a winding coil 123 . The winding coil 123 is connected to the stator core 122 , and the bobbin 121 is disposed between the stator core 122 and the winding coil 123 .

[0063] Specifically, the stator core 122 is integrally formed, and radial spokes are arranged inside. The number of winding coils 123 matches the number of spokes in the center of the stator core 122. In addition, the bobbin 121 is divided into two parts. The upper and lower areas of the positioning core are hollow. Since the spoke ends of the positioning core are sheet-shaped, the single bobbin 121 cannot be loaded from one end of the positioning core, and the positioning core needs to be split into two parts. The two parts of the bobbin 121 are inserted from the upper and lower positions of the positioning core and installed in the positioning core. After the bobbin 121 is installed on the positioning core, winding is performed on the spokes on which the bobbin 121 is installed to form the winding coils 123. The stator core 122 is inserted into the winding frame 121 to complete the winding. Finally, the installation of the bobbin 121 and the winding process are completed, and the stator core 122 is pressed onto the outer shell 17 with glue or by interference fit.

[0064] The brushless DC slide motor 1 includes a circuit assembly 18 , which is electrically connected to the stator assembly 12 , and the circuit assembly 18 is connected to the lower end cover 15 .

[0065] Specifically, the circuit assembly 18 is installed on the lower end cover 15, and the circuit assembly 18 is arranged between the stator assembly 12 and the lower end cover 15. The outer shell 17 is sleeved on the outside of the stator assembly 12 and the circuit assembly 18. The circuit assembly 18 is connected to the stator assembly 12, and the circuit assembly 18 supplies power to the winding coil 123.

[0066] The circuit assembly 18 includes a Hall sensor 181, a temperature control switch 182, and a connector 183. The Hall sensor 181 is connected to the temperature control switch 182. The Hall sensor 181 is used to sense the position of the rotor core 113. The connector 183 connects the winding coil 123 and the temperature control switch 182 respectively.

[0067] Specifically, the connector 183, the temperature control switch 182 and the Hall sensor 181 are integrated on a PCB board 184. The connector 183 is used to connect an external power supply. The temperature control switch 182 is connected in series with the Hall sensor 181. The temperature control switch 182 is used to sense the internal temperature of the motor. When the protection temperature is reached, the power supply of the Hall sensor 181 is disconnected, so that the Hall sensor 181 has an over-temperature protection function. The connector 183 is connected to an external power supply, and is connected to a high-current three-phase power supply and a low-current power supply. The low-current power supply supplies power to the Hall sensor 181. The high-current three-phase power supply is connected to the winding coil 123. The temperature control switch 182 is a low-current temperature protector, which is small in size and high in sensitivity, and can be more conveniently arranged in the motor.

[0068] In addition, the PCB board 184 integrating the connector 183, the temperature control switch 182, the Hall sensor 181 and other electronic components is fixed on the stator assembly 12 through the positioning groove on the wire frame 121 and then welded with the three-phase wire. The wire frame 121 extends a baffle 1211 to abut against the PCB board and insulate it from the outer shell 17. The connector 183 replaces the lead wire on the PCB board 184, which improves production efficiency and further meets the automotive safety requirements and improves reliability.

[0069] In this embodiment, three Hall sensors 181 are provided, and the motor is driven by feedback through the positions of three Hall induction magnets 111 .

[0070] In a second aspect, the present invention discloses a car seat, which comprises the above-mentioned DC brushless slide rail motor 1.

[0071] Specifically, a brushless DC slide rail motor 1 is adopted, and the rotor core 113 inside the motor is designed to be offset relative to the stator assembly 12. During operation, the rotor assembly 11 generates an axial magnetic pulling force to move the rotor shaft 112 to one end. One end of the rotor assembly 11 is in contact and friction with the upper bearing 14 or the lower bearing 16, and the other end is in a suspended state, keeping a certain distance from the lower bearing 16 or the upper bearing 14, so that there is no friction sound at one end of the rotor shaft 112, and the friction sound is reduced by half, thereby achieving a noise reduction effect. The noise emitted by the car seat during operation is smaller, creating a quieter driving environment for users.

[0072] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0073] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0074] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0075] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0076] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0077] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 invention. In this specification, the schematic representation of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0078] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0079] The above is a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A brushless DC slide motor, characterized in that: It includes an upper end cover, an upper end bearing, a lower end cover, a lower end bearing, a rotor assembly, and a stator assembly. The two ends of the rotor assembly are respectively connected to the upper end cover and the lower end cover. The stator assembly is arranged around the rotor assembly. The upper end bearing is installed at the center of the upper end cover, and the lower end bearing is installed at the center of the lower end cover; The rotor assembly comprises a rotor shaft and a rotor core, wherein the rotor core is sleeved on the rotor shaft, two ends of the rotor shaft are respectively connected to the upper end bearing and the lower end bearing, and the rotor core is arranged close to the upper end bearing or the lower end bearing; The rotor core and the stator assembly are arranged in a relatively staggered manner, and any end of the rotor shaft is close to the upper end cover or the lower end cover.

2. The brushless DC slide rail motor according to claim 1, characterized in that: The upper end cover is provided with a first fixing claw, and the upper end bearing is installed in the first fixing claw; The lower end cover is provided with a second fixing claw, and the lower end bearing is installed in the second fixing claw.

3. The brushless DC slide rail motor according to claim 1, characterized in that: The rotor assembly includes a graphite gasket, a positioning ring, and a silicone gasket. The graphite gasket, the silicone gasket, and the positioning ring are sleeved on the rotor shaft, and the positioning ring is interference-connected with the rotor shaft. The positioning ring is close to the rotor core, the graphite gasket is close to the upper end cover or the lower end cover, and the silicone gasket is arranged between the graphite gasket and the positioning ring.

4. The brushless DC slide rail motor according to claim 1, characterized in that: The stator assembly includes a stator core and a winding coil, and the winding coil is connected to the stator core.

5. The brushless DC slide rail motor according to claim 4, characterized in that: The stator assembly includes a bobbin, and the bobbin is arranged between the stator core and the winding coil.

6. The brushless DC slide rail motor according to claim 3, characterized in that: It comprises an outer peripheral shell, the outer peripheral shell is arranged on the outer peripheral side of the stator assembly, and the upper end cover and the lower end cover are respectively arranged at two ends of the outer peripheral shell; The outer peripheral shell is interference fit with the stator assembly.

7. The brushless DC slide rail motor according to claim 1, characterized in that: It includes a circuit assembly, wherein the circuit assembly is electrically connected to the stator assembly, and the circuit assembly is connected to the lower end cover.

8. The brushless DC slide rail motor according to claim 7, characterized in that: The circuit assembly includes a Hall sensor and a temperature-controlled switch. The Hall sensor is connected to the temperature-controlled switch. The Hall sensor is used to sense the position of the rotor core.

9. The brushless DC slide rail motor according to claim 7, characterized in that: The circuit assembly comprises a connector, and the connector is respectively connected to the winding coil and the temperature control switch.

10. A car seat, characterized in that: The brushless DC slide rail motor comprises any one of claims 1 to 9.

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