Brushless motor, side door drive assembly, and automobile body

Abstract

The utility model provides a kind of brushless motor, side door drive assembly and automobile body, brushless motor includes rotor shaft, magnetic structure, stator core and multiple stator windings, stator core is set around rotor shaft, multiple stator windings are distributed along circumference and are all wound on stator core, magnetic structure is fixedly set on rotor shaft, it further includes at least one magnetic induction sensor, at least one relief groove is opened on the surface of stator core, magnetic induction sensor is at least partially contained in relief groove, magnetic induction sensor can generate corresponding electrical signal in response to the change of magnetic field intensity where it is when magnetic structure rotates.In the utility model, the magnetic induction sensor for detecting rotor rotation angle is arranged in the relief groove on the surface of stator core, so as to overlap with the axial position of stator core, the space required for axially spaced magnetic induction sensor is saved, and the compactness of vehicle side door structure is further guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of automotive equipment, specifically to a brushless motor, a side door drive assembly, and an automotive body. Background Technology

[0002] In vehicles with larger and wider bodies, sliding doors are typically used on both sides of the rear passenger area to ensure smooth entry and exit and to prevent the doors from being restricted by the surrounding space. Compared with traditional rotating side doors, sliding doors can be smoothly pushed open and pulled open even when the vehicle is in a confined space, ensuring a better user experience.

[0003] To further optimize the user experience, a motor can be installed on the side of the vehicle to drive the side door to open and close automatically. Specifically, the motor and reducer drive an actuator (such as a cable pull mechanism) to move the side door linearly. However, the existing automotive side door drive motors are relatively large, affecting the compact layout of the vehicle's side.

[0004] Therefore, how to provide a more compact side door motor has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0005] This utility model aims to solve one of the technical problems in related technologies to a certain extent. To this end, this utility model provides a brushless motor, a side door drive assembly, and a car body. The brushless motor has a compact structure, which helps to improve the compactness of the vehicle's side door.

[0006] To achieve the above objectives, as one aspect of this utility model, a brushless motor is provided, comprising a rotor shaft, a magnetic structure, a stator core, and multiple stator windings. The stator core is arranged around the rotor shaft, and the multiple stator windings are distributed circumferentially and wound around the stator core. The magnetic structure is fixedly disposed on the rotor shaft. The stator windings can generate a magnetic field when energized to drive the magnetic structure to rotate the rotor shaft. The brushless motor also includes at least one magnetic induction sensor. At least one clearance groove is formed on the surface of the stator core, and the magnetic induction sensor is at least partially accommodated in the clearance groove. The magnetic induction sensor can generate a corresponding electrical signal in response to the change in the magnetic field strength around it when the magnetic structure rotates.

[0007] Optionally, the brushless motor further includes a reducer and a circuit board, the reducer and the circuit board being respectively disposed on both sides of the stator core along the axis of the rotor shaft, and the circuit board being electrically connected to the magnetic induction sensor;

[0008] The reducer is a planetary gear reducer, with the sun gear of the reducer mounted on the rotor shaft, and the central shaft of the reducer forming the output shaft of the brushless motor.

[0009] Optionally, the stator core includes a connecting cylinder and a plurality of winding portions surrounding the outside of the connecting cylinder. The plurality of stator windings are respectively wound on the plurality of winding portions. The magnetic structure includes a magnetic coil and a magnetic coil frame. The magnetic coil is surrounding the outside of the stator core and has a plurality of magnetic poles distributed circumferentially. The magnetic coil frame is connected between the magnetic coil and the rotor shaft. The magnetic induction sensor is disposed between adjacent winding portions. The clearance groove is located on the surface of at least one winding portion facing the adjacent winding portion.

[0010] Optionally, the winding portion includes a winding block and a limiting block. The winding block is connected between the limiting block and the connecting cylinder, and the circumferential width of the winding block is smaller than the circumferential width of the connecting cylinder. The stator winding is wound on the winding block, and the clearance groove is formed on the limiting block.

[0011] Optionally, the clearance groove is formed on the winding portion located on both sides of the magnetic induction sensor.

[0012] Optionally, the stator core includes a plurality of first stator laminations and a plurality of second stator laminations, wherein the plurality of first stator laminations and the plurality of second stator laminations are stacked along the axial direction, and the plurality of second stator laminations are located on one side of the plurality of first stator laminations along the axial direction; the second stator laminations are formed with clearance notches, and the clearance notches on the plurality of second stator laminations together form the clearance groove.

[0013] Optionally, the brushless motor further includes a top stator support and a bottom stator support. The top stator support and the bottom stator support are respectively disposed on both sides of the stator core along the axial direction and respectively cover the surfaces of both sides of the stator core along the axial direction. The position of the bottom stator support corresponds to the second stator lamination, and a support groove communicating with the clearance groove is formed on the bottom stator support. The magnetic induction sensor is partially disposed in the support groove.

[0014] Optionally, the stator core includes a connecting cylinder and a plurality of winding portions surrounding and connected to the outside of the connecting cylinder, the plurality of stator windings being wound on the plurality of winding portions respectively, the magnetic structure including a magnetic element, the magnetic element being sleeved on the rotor shaft and located in the connecting cylinder, the magnetic element having a plurality of magnetic poles distributed circumferentially; the clearance groove is located on the inner wall of the connecting cylinder.

[0015] As a second aspect of this utility model, a side door drive assembly is provided, including an actuator and the aforementioned brushless motor. The brushless motor is fixedly connected to one of the side door and the passenger compartment of a vehicle. The actuator is connected to the other of the side door and the passenger compartment. The actuator is connected to the output shaft of the brushless motor and is capable of converting the rotational motion of the output shaft into a sliding motion of the side door relative to the passenger compartment.

[0016] As a third aspect of this utility model, a car body is provided, including a passenger compartment and at least one side door, the side door being disposed on the side of the passenger compartment and movably connected to the passenger compartment, characterized in that the car body further includes the aforementioned side door drive assembly, the side door drive assembly being connected between the side door and the passenger compartment.

[0017] In the brushless motor, side door drive assembly and automobile body provided by this utility model, the winding of the brushless motor is fixedly set, and the magnetic structure, which is a permanent magnet, is fixed on the rotor shaft and rotates with the rotor shaft. The resistance generated by the brushless motor when reversing is less than that of the brushed motor. Therefore, the brushless motor can be directly connected to the actuator, eliminating the need for structures such as clutches and improving the compactness of the vehicle side door structure.

[0018] Furthermore, in related technologies, the iron core and windings of a brushed motor are both mounted on the rotor shaft and rotate with it. Hall sensors, however, need to be connected to a fixed circuit board or wiring, making it impossible to mount them together with the windings on the rotor shaft. In brushless motors, to ensure the uniformity of the alternating magnetic field strength along the circumference, it's generally not considered to carve grooves on the surface of the stator iron core; instead, Hall sensors are spaced apart axially. In this invention, the magnetic induction sensor used to detect the rotor rotation angle is not mounted on the axial side of the magnetic structure, but rather in a clearance groove on the surface of the stator iron core. This allows the axial position of the magnetic induction sensor to overlap with the axial position of the stator iron core, saving the space required for axially spaced magnetic induction sensors, further reducing the overall size of the brushless motor, and ensuring the compactness of the vehicle side door structure. Experimental testing has verified that slotting the stator iron core surface and mounting Hall sensors in the clearance groove does not affect the normal operation of the brushless motor. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the internal structure of a brushless motor provided in one embodiment of the present invention;

[0021] Figure 2 yes Figure 1 A cross-sectional structural diagram of a brushless motor;

[0022] Figure 3 This is a schematic diagram of the internal structure of a brushless motor provided in another embodiment of the present invention;

[0023] Figure 4 Yes, yes Figure 3 A cross-sectional structural diagram of a brushless motor;

[0024] Figure 5 yes Figure 3 A disassembly diagram of the stator section of a brushless motor;

[0025] Figure 6 yes Figure 3 A disassembly diagram of the rotor section of a brushless motor;

[0026] Figure 7 yes Figure 1 A disassembly diagram of the stator section of a brushless motor;

[0027] Figure 8 yes Figure 1 A disassembly diagram of the rotor section of a brushless motor;

[0028] Figure 9 This is a schematic diagram showing the positional relationship between the stator core and the magnetic induction sensor in a brushless motor provided in this embodiment of the utility model;

[0029] Figure 10 yes Figure 9 Disassembly diagram of the middle structure;

[0030] Figure 11 This is a partial structural diagram of a car body provided in one embodiment of the present invention;

[0031] Figure 12 This is a partial structural diagram of a car body provided in another embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] Housing 100; Housing base 110; Mounting cylinder 111; Top cover 120; Annular positioning boss 121; Circuit board 201; Control cable 202; Rotor shaft 210; Magnetic component 220; Stator core 230; First stator lamination 230a; Second stator lamination 230b; Connecting cylinder 231; Winding section 232; Winding mounting section 233; Stator winding 240; Top stator bracket 251; Bottom stator bracket 252; Bracket slot 253; Stator end cover 260; Top bearing 271 Bottom bearing 272; Rotor bearing 273; First bearing washer 274; Second bearing washer 275; Elastic retaining ring 276; Magnetic ring 280; Magnetic pole fixing cylinder 281; Magnetic part 282; Magnetic ring frame 290; Reducer 300; Central shaft 310; Planetary carrier 320; Gear mounting hole; Gear ring 330; Planetary gear 340; Gear shaft 350; Output bearing 410; First limit ball 510; Mounting fastener 520; Magnetic induction sensor 610; Clearance groove 620. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this utility model and should not be construed as limiting it.

[0035] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this utility model. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0036] In related technologies, the motor of the side door usually adopts a brushed motor structure. When the user manually pushes or pulls the side door, the brushed motor will reverse under the action of external force and generate a large resistance to the side door under the action of stator inductance. To eliminate this resistance, an additional clutch structure is often required between the motor and the actuator, resulting in a large overall size of the side door. In addition, in order to accurately detect the motor feed, a Hall sensor needs to be set on one side of the rotor along the axial direction, which further lengthens the overall size of the motor along the axial direction, which is not conducive to achieving a compact design of the side door.

[0037] To address the aforementioned technical problems, as one aspect of this utility model, a brushless motor is provided, such as... Figures 1 to 4As shown, the brushless motor includes a rotor shaft 210, a magnetic structure, a stator core 230, and multiple stator windings 240. The stator core 230 is arranged around the rotor shaft 210, and the multiple stator windings 240 are distributed circumferentially and all wound on the stator core 230. The magnetic structure is fixedly mounted on the rotor shaft 210. The stator windings 240 can generate a magnetic field when energized to drive the magnetic structure and rotate the rotor shaft 210. Figure 5 , Figure 7 , Figure 9 , Figure 10 As shown, the brushless motor also includes at least one magnetic induction sensor 610. The stator core 230 has at least one clearance slot 620. The magnetic induction sensor 610 is at least partially housed in the clearance slot 620. The magnetic induction sensor 610 can generate a corresponding electrical signal in response to the change in the magnetic field strength when the magnetic structure rotates.

[0038] Understandably, the magnetic induction sensor 610 can generate a corresponding electrical signal in response to changes in the magnetic field strength it is in. By receiving this electrical signal through the brushless motor's own circuit board or an external signal analysis module, information such as the rotation speed and rotation angle of the magnetic structure can be determined. Furthermore, the stator winding commutation can be precisely controlled based on this electrical signal, as well as functions such as speed monitoring and overload protection can be achieved.

[0039] This utility model provides a brushless motor for connection with vehicle side doors or carriages. Its windings are fixedly arranged, and the magnetic structure, which is a permanent magnet, is fixed on the rotor shaft 210 and rotates with the rotor shaft 210. The resistance generated by the brushless motor when it reverses is less than that of the brushed motor. Therefore, the brushless motor can be directly connected to the actuator, eliminating the need for structures such as clutches and improving the compactness of the vehicle side door structure.

[0040] Furthermore, in related technologies, the iron core and windings of a brushed motor are both mounted on the rotor shaft and rotate with it. Hall sensors, however, need to be connected to a fixed circuit board or wiring, making it impossible to mount them together with the windings on the rotor shaft. In brushless motors, to ensure the uniformity of the alternating magnetic field strength along the circumference, it's generally not considered to carve grooves on the surface of the stator iron core; instead, Hall sensors are spaced apart axially. In this invention, the magnetic induction sensor 610 for detecting the rotor rotation angle is not mounted on the axial side of the magnetic structure, but directly in the clearance groove 620 on the surface of the stator iron core 230. This allows the axial position of the magnetic induction sensor 610 to overlap with the axial position of the stator iron core 230, saving the space required for axially spaced magnetic induction sensors 610, further reducing the overall size of the brushless motor, and thus ensuring the compactness of the vehicle side door structure. Actual manufacturing verification shows that the slotted surface of the stator core 230 and the magnetic induction sensor 610 set in the clearance slot 620 have little impact on the alternating magnetic field generated by the stator. Moreover, the magnetic induction sensor 610 can normally sense the change in the orientation of the magnetic poles when the magnetic structure rotates, and will not affect the normal use of the brushless motor.

[0041] As an optional embodiment of this utility model, the magnetic induction sensor 610 can be a Hall sensor.

[0042] Alternatively, in other embodiments of this utility model, the magnetic induction sensor 610 may also be a magnetoresistive sensor, an inductive magnetic sensor (which measures the magnetic field by the induced electromotive force generated by the sensing coil being affected by the change of the magnetic field), a magnetostrictive sensor, etc.

[0043] As an optional embodiment of this utility model, such as Figures 1 to 4 As shown, the brushless motor also includes a housing 100, and the rotor shaft 210, magnetic structure, stator core 230, and stator winding 240 are all disposed in the housing 100.

[0044] As an optional embodiment of this utility model, such as Figures 1 to 4 As shown, the brushless motor also includes a reducer 300 and a circuit board 201. The reducer 300 and the circuit board 201 are respectively disposed on both sides of the stator core 230 along the axis of the rotor shaft 210. The circuit board 201 is electrically connected to the magnetic induction sensor 610.

[0045] The reducer 300 is a planetary gear reducer. The sun gear of the reducer 300 is mounted on the rotor shaft 210, and the central shaft 310 of the reducer 300 forms the output shaft of the brushless motor.

[0046] In this embodiment of the invention, the reducer 300 is a planetary gear reducer, with its sun gear mounted on the rotor shaft 210. As the rotor shaft 210 and the sun gear rotate, the planetary gears 340 rotate on their own axes and revolve around the ring gear 330 under meshing action, thereby driving the planetary carrier 320 and the output shaft of the reducer 300 to rotate, thus achieving the transmission effect of reducing speed and increasing torque. Furthermore, the planetary gear reducer and the motor assembly are both cylindrical structures with the output shaft located in the center, which can effectively reduce the overall size of the brushless motor, thereby saving wiring space in the vehicle side door transmission area.

[0047] Optionally, such as Figures 1 to 4 As shown, the brushless motor also includes a control cable 202. The first end of the control cable 202 is electrically connected to the circuit board 201, and the second end of the control cable 202 extends out of the housing 100 through the cable hole on the housing 100. The control cable 202 is used to connect to the control components on the vehicle so that the control components can control the brushless motor to work through electrical signals and realize automatic opening and closing of the car doors.

[0048] Optionally, the second end of the control cable 202 is connected to a plug, which can be quickly plugged into a socket on the side door or in the passenger compartment of the vehicle to facilitate the rapid installation of the brushless motor provided in this embodiment of the invention onto the vehicle body structure.

[0049] Optionally, such as Figures 1 to 4 As shown, the brushless motor also includes at least one first limiting ball 510, which is rotatably disposed between the end face of the rotor shaft 210 and the portion of the reducer 300 opposite to the end face of the rotor shaft 210, such that there is a gap between the end face of the rotor shaft 210 and the portion of the reducer 300 opposite to the end face of the rotor shaft 210, wherein the position of the first limiting ball 510 in the brushless motor remains unchanged.

[0050] In this embodiment of the invention, a first limiting ball 510 is provided between the end face of the rotor shaft 210 and the components of the reducer 300 (central shaft 310 or planetary carrier 320). Thus, even if the rotor shaft 210 and the components of the reducer 300 are made axially adjacent in order to shorten the axial dimension of the brushless motor, the first limiting ball 510 can be used to maintain an axial gap between the rotor shaft 210 and the reducer components, reduce the friction between the rotor shaft 210 and the reducer components, and thus ensure the transmission efficiency of the brushless motor and the internal structural stability of the brushless motor.

[0051] Optionally, such as Figures 1 to 4 As shown, a first limiting groove is formed on the end face of the rotor shaft 210 facing the reducer 300, and a first limiting ball 510 is partially accommodated in the first limiting groove, and / or

[0052] A second limiting groove is formed on the surface of the central shaft 310 or planetary carrier 320 facing the rotor shaft 210, and the first limiting ball 510 is partially accommodated in the second limiting groove.

[0053] In this embodiment of the present invention, a first limiting ball 510 is provided between the rotor shaft 210 and the reducer 300, and at least one of the rotor shaft 210 and the reducer 300 is grooved at the position corresponding to the first limiting ball 510. The positional stability of the first limiting ball 510 is maintained by the first limiting groove at the top of the rotor shaft 210 and / or the second limiting groove at the bottom of the reducer 300. Thus, the axial clearance between the rotor shaft 210 and the reducer 300 can be maintained by the first limiting ball 510, reducing the friction between the rotor shaft 210 and the reducer 300, thereby ensuring the transmission efficiency of the brushless motor and the internal structural stability of the brushless motor.

[0054] As an optional embodiment of this utility model, such as Figures 1 to 4 As shown, the sun gear of the reducer 300 is integrated with the rotor shaft 210, that is, the rotor shaft 210 is a splined shaft, which meshes with multiple planetary gears 340 through the spline at the top of the rotor shaft 210.

[0055] Optionally, such as Figures 1 to 4 As shown, the housing 100 includes a housing base 110 and a top cover 120. The rotor shaft 210, magnetic structure, stator core 230, stator winding 240 and reducer 300 are all disposed in the housing base 110. The top of the housing base 110 has a housing top opening. The top cover 120 is fixedly connected to the housing base 110 and closes the housing top opening. An output through hole is formed on the top cover 120. The central shaft 310 of the reducer 300 passes through the output through hole to the outside of the housing 100 and forms an output shaft.

[0056] Optionally, such as Figures 1 to 4 As shown, the top cover 120 has a top bearing groove on the side facing the stator core 230, and the output through hole extends from the bottom of the top bearing groove to the outer surface of the top cover 120; the brushless motor also includes an output bearing 410, the outer ring structure of the output bearing 410 is disposed in the top bearing groove, and the inner ring structure of the output bearing 410 is sleeved on the output shaft of the reducer 300.

[0057] Understandably, in the case where the reducer 300 includes multiple planetary assemblies, the central shaft 310 of the outermost planetary assembly extends out of the housing 100 and forms an output shaft. The first limiting ball 510 is disposed between the rotor shaft 210 and the planet carrier 320 closest to the rotor shaft 210. Correspondingly, the second limiting groove is formed at the bottom of the planet carrier 320 closest to the rotor shaft 210.

[0058] Optionally, such as Figures 1 to 4As shown, the reducer 300 includes at least one planetary assembly, which includes a central shaft 310, a planet carrier 320, a ring gear 330, a sun gear, and multiple planetary gears 340. The central shaft 310 is fixedly disposed on the side of the planet carrier 320 away from the stator core 230. The multiple planetary gears 340 are movably disposed on the planet carrier 320 and distributed around the axis of the central shaft 310. The ring gear 330 is sleeved on the outside of the multiple planetary gears 340 and meshes with the multiple planetary gears 340. The ring gear 330 is fixedly disposed in the housing 100. The rotor shaft 210 is fixedly connected to the sun gear closest to the rotor shaft 210 in the reducer 300. A first limiting ball 510 is disposed between the rotor shaft 210 and the planet carrier 320 closest to the rotor shaft 210 in the reducer 300.

[0059] To ensure the coaxiality between the top cover 120 and the housing 110, and thus the coaxiality between the output shaft of the reducer 300 and the rotor shaft 210, preferably, the bottom of the top cover 120 has an annular positioning boss 121, which extends around the output through hole, is accommodated inside the housing 110, and abuts against the top surface of the gear ring 330.

[0060] Optionally, the output bearing 410 is a deep groove ball bearing.

[0061] Optionally, such as Figures 1 to 4 As shown, the planetary assembly also includes multiple gear shafts 350. Each gear shaft 350 includes an assembly section, a mating section, and a limiting section that are connected sequentially along its length and whose diameters increase sequentially. The planet carrier 320 has multiple gear mounting holes, and the planetary gear 340 has gear limiting holes and gear mating holes that are connected sequentially along its axial direction. The gear shafts 350 pass through the gear limiting holes and gear mating holes sequentially and are fixed in the gear mounting holes. The assembly section is accommodated in the gear mating hole, and the limiting section is accommodated in the gear limiting hole.

[0062] In this embodiment of the utility model, the shaft hole of the planetary gear 340 adopts a countersunk design, and the assembly section and the limiting section of the gear shaft 350 are both hidden inside the planetary gear 340, thereby further shortening the overall axial dimension of the reducer 300 and improving the overall axial structural compactness of the brushless motor.

[0063] In some embodiments of this invention, the central shaft 310 can be inserted into the central hole of the planetary carrier 320, in which case the central shaft 310 and the rotor shaft 210 abut against each other via the first limiting ball 510. Correspondingly, a second limiting groove can be formed on the side of the central shaft 310 facing the rotor shaft 210.

[0064] Preferably, such as Figures 1 to 4As shown, the central shaft 310 and the planetary carrier 320 are integrally formed by powder metallurgy, and the second limiting groove is formed on the side of the planetary carrier 320 facing the rotor shaft 210.

[0065] In this embodiment of the utility model, the central shaft 310 and the planetary carrier 320 are formed into one piece by powder metallurgy. Compared with the scheme of assembling or welding the central shaft 310 and the planetary carrier 320, this can effectively improve the coaxiality between the central shaft 310 and the rotor shaft 210, and improve the stability of the internal structure of the reducer 300, thereby ensuring the stability and smoothness of the brushless motor operation.

[0066] As an optional embodiment of this utility model, such as Figures 3 to 6 As shown, the brushless motor can be an external rotor motor. Specifically, the stator core 230 includes a connecting cylinder 231 and multiple winding portions 232 that are connected to the outside of the connecting cylinder 231. Multiple stator windings 240 are respectively wound on the multiple winding portions 232. The magnetic structure includes a magnetic coil 280 and a magnetic coil frame 290. The magnetic coil 280 is arranged around the outside of the stator core 230 and has multiple magnetic poles distributed circumferentially. The magnetic coil frame 290 is connected between the magnetic coil 280 and the rotor shaft 210. The magnetic induction sensor 610 is disposed between adjacent winding portions 232. The clearance groove 620 is located on the surface of at least one winding portion 232 facing the adjacent winding portion 232.

[0067] That is, when the brushless motor adopts an external rotor motor, the magnetic ring 280 is wrapped around the outside of the stator core 230. The magnetic induction sensor 610 can be set in the gap between adjacent winding portions 232 and in the clearance groove 620 on the surface of the winding portion 232, so as to be as close as possible to the outer magnetic ring 280, thereby realizing the detection of the feed amount of the brushless motor by sensing the change of the magnetic field of the magnetic ring 280.

[0068] Optionally, such as Figure 5 , Figure 9 , Figure 10 As shown, the winding part 232 includes a winding block and a limiting block. The winding block is connected between the limiting block and the connecting cylinder 231, and the circumferential width of the winding block is smaller than the circumferential width of the connecting cylinder 231. The stator winding 240 is wound on the winding block, and the clearance groove 620 is formed on the limiting block.

[0069] Optionally, such as Figure 5 , Figure 9 , Figure 10 As shown, clearance grooves 620 are formed on the winding portions 232 on both sides of the magnetic induction sensor 610.

[0070] Optionally, such as Figures 3 to 6As shown, the inner wall of the housing 100 on the side away from the reducer 300 has a mounting sleeve 111 extending along the axial direction of the rotor shaft 210. The stator winding 240 is sleeved on the mounting sleeve 111. The brushless motor also includes multiple rotor bearings 273. The outer ring structure of the multiple rotor bearings 273 is fixed in the mounting sleeve 111, and the inner ring structure of the multiple rotor bearings 273 is sleeved on the stator shaft.

[0071] Optionally, rotor bearing 273 is a deep groove ball bearing.

[0072] Optionally, such as Figures 3 to 6 As shown, the brushless motor also includes at least one first bearing washer 274, which is sleeved on the rotor shaft 210 and stacked between the outer ring structures of adjacent rotor bearings 273.

[0073] Optionally, such as Figures 3 to 6 As shown, the brushless motor also includes a second bearing washer 275, which is sleeved on the rotor shaft 210 and stacked between the magnetic coil frame 290 and the inner ring structure of its adjacent rotor bearing 273.

[0074] Optionally, such as Figures 3 to 6 As shown, the brushless motor also includes an elastic retaining ring 276. An annular groove is formed on the rotor shaft 210, and the elastic retaining ring 276 is disposed in the annular groove and abuts against the bottom of the inner ring structure of the lowest rotor bearing 273.

[0075] Optionally, such as Figures 3 to 6 As shown, the magnetic coil 280 includes a magnetic pole fixing cylinder 281 and a plurality of magnetic parts 282. The magnetic pole fixing cylinder 281 is arranged around the outside of the stator core 230, and the end of the magnetic pole fixing cylinder 281 facing the reducer 300 is fixedly connected to the magnetic coil frame 290. The plurality of magnetic parts 282 are fixedly arranged on the inner wall of the fixing cylinder and distributed circumferentially, and the plurality of magnetic parts 282 form a plurality of magnetic poles of the magnetic coil 280.

[0076] Optionally, such as Figures 3 to 6 As shown, the magnetic coil frame 290 includes a frame plate, a first mating cylinder, and a second mating cylinder. The frame plate is disposed between the stator core 230 and the reducer 300. The rotor shaft 210 passes through the frame plate. The first mating cylinder and the second mating cylinder are both fixed to the side of the frame plate facing the stator core 230. The second mating cylinder is arranged around the outside of the first mating cylinder. The first mating cylinder is sleeved on the rotor shaft 210. The outer side wall of the second mating cylinder contacts and is fixedly connected to the inner side wall of the magnetic pole fixing cylinder 281.

[0077] Optionally, such as Figures 3 to 4 As shown, the bottom wall of the housing 100 also has an assembly through hole, which connects the mounting cylinder 111 to the outside of the housing 100.

[0078] Optionally, such as Figure 5 As shown, the stator core 230 includes a plurality of first stator laminations 230a and a plurality of second stator laminations 230b. The plurality of first stator laminations 230a and the plurality of second stator laminations 230b are stacked along the axial direction, and the plurality of second stator laminations 230b are located on one side of the plurality of first stator laminations 230a along the axial direction. The second stator laminations 230b have clearance notches formed on them, and the clearance notches on the plurality of second stator laminations 230b together form clearance grooves 620.

[0079] It is understood that the connecting cylinder 231, the winding part 232 and the winding mounting part 233 are all formed by stacking stator laminations. This utility model uses two specifications of stator laminations. Multiple second stator laminations 230b located on one side of the axial direction are stacked to form a clearance groove 620 to accommodate the magnetic induction sensor 610.

[0080] Optionally, such as Figures 3 to 5 As shown, the brushless motor also includes a top stator support 251 and a bottom stator support 252. The top stator support 251 and the bottom stator support 252 are respectively disposed on both sides of the stator core 230 along the axial direction and respectively cover the surfaces of both sides of the stator core 230 along the axial direction. The position of the bottom stator support 252 corresponds to the second stator lamination 230b, and a support groove 253 communicating with the clearance groove 620 is formed on the bottom stator support 252. The magnetic induction sensor 610 is partially disposed in the support groove 253.

[0081] As another optional embodiment of this utility model, the brushless motor can also be an internal rotor motor, specifically, such as... Figure 1 , Figure 2 , Figure 7 , Figure 8 As shown, the stator core 230 includes a connecting cylinder 231 and multiple winding portions 232 that are connected to the outside of the connecting cylinder 231. Multiple stator windings 240 are respectively wound on the multiple winding portions 232. The magnetic structure includes a magnetic element 220, which is sleeved on the rotor shaft 210 and located in the connecting cylinder 231. The magnetic element 220 has multiple magnetic poles distributed circumferentially. A clearance groove 620 is formed on the inner wall of the connecting cylinder 231.

[0082] That is, when the brushless motor adopts an internal rotor motor, the stator core 230 is surrounded on the outside of the magnetic component 220. The magnetic induction sensor 610 can be set in the slotted structure of the inner wall of the stator core 230 to be as close as possible to the inner magnetic component 220, so as to detect the feed amount of the brushless motor by sensing the change of the magnetic field of the magnetic component 220.

[0083] Optionally, such as Figure 1 , Figure 2 , Figure 7 , Figure 8As shown, the brushless motor also includes a stator end cover 260, which is disposed on the side of the stator core 230 facing the reducer 300. The stator end cover 260 is fixedly connected to the housing 100, and the edge of the stator end cover 260 contacts the inner wall of the housing 100. One end of the rotor shaft 210 passes through the stator end cover 260 and is connected to the reducer 300.

[0084] Optionally, such as Figure 1 , Figure 2 , Figure 7 , Figure 8 As shown, the brushless motor also includes a top bearing 271. The stator end cover 260 has a top bearing groove on the side facing the stator core 230. The outer ring structure of the top bearing 271 is fixedly installed in the top bearing groove, and the inner ring structure of the top bearing 271 is sleeved on the stator shaft.

[0085] Optionally, the top bearing 271 is a deep groove ball bearing.

[0086] Optionally, such as Figure 1 , Figure 2 , Figure 7 , Figure 8 As shown, the brushless motor also includes a bottom bearing 272. The bottom wall of the housing 100 has a bottom bearing groove. The outer ring structure of the bottom bearing 272 is fixedly installed in the bottom bearing groove, and the inner ring structure of the bottom bearing 272 is sleeved on the stator shaft.

[0087] Optionally, the bottom bearing 272 is a deep groove ball bearing.

[0088] Optionally, such as Figure 1 , Figure 2 , Figure 7 , Figure 8 As shown, the bottom wall of the housing 100 also has an assembly through hole, which extends from the bottom of the bottom bearing groove to the outside of the housing 100.

[0089] Optionally, such as Figure 1 , Figure 2 , Figure 7 As shown, the stator end cover 260 is fixedly connected to the bottom wall of the housing 100 by mounting fasteners 520.

[0090] Optionally, such as Figure 1 , Figure 2 , Figure 7 As shown, the stator core 230 also includes multiple winding mounting portions 233. The winding mounting portions 233 are connected to the outside of the winding portions 232. Stator mounting through holes are formed in the winding mounting portions 233. The mounting fasteners 520 pass through the stator end cover 260 and the multiple stator mounting through holes of the stator core 230 in sequence and are fixedly connected to the bottom wall of the housing 100.

[0091] As a second aspect of this utility model, a side door drive assembly is provided, including an actuator and a brushless motor provided in the embodiments of this utility model. The brushless motor is fixedly connected to one of the side door and the passenger compartment of a car, and the actuator is connected to the other of the side door and the passenger compartment. The actuator is connected to the output shaft of the brushless motor and is capable of converting the rotational motion of the output shaft into the sliding motion of the side door relative to the passenger compartment.

[0092] As an optional embodiment of this utility model, the actuator can be a spool pulling mechanism. Specifically, the actuator can include a spool, a first pull wire, and a second pull wire. The spool is connected to the output shaft of the reducer 300. The brushless motor is mounted on one of the side door and the carriage. The first end of the first pull wire and the first end of the second pull wire are both wound around the spool, and the winding directions of the first pull wire and the second pull wire on the spool are opposite. The second end of the first pull wire and the second end of the second pull wire are both fixedly mounted on the other of the side door and the carriage, and the second end of the first pull wire and the second end of the second pull wire are respectively located on both sides of the spool.

[0093] Taking a brushless motor mounted on the carriage and the second ends of the first and second cables connected to the side door as an example, when it is necessary to control the door to move to one side, the brushless motor can be controlled to drive the reel to rotate in a certain direction, causing the reel to tighten the first cable and release the second cable, and the second end of the first cable pulls the door to that side; when it is necessary to control the door to move to the other side, the brushless motor can be controlled to drive the reel to rotate in the other direction, causing the reel to tighten the second cable and release the first cable, and the second end of the second cable pulls the door to the other side in the opposite direction.

[0094] As an optional embodiment of this utility model, the actuator can also be a transmission pair in the form of a pulley. Specifically, the actuator includes a driving wheel, a driven wheel, a flexible traction belt, and a connecting seat. The driving wheel is connected to the output shaft of the reducer 300. The push-pull motor and the driven wheel are disposed on one of the side door and the carriage. The flexible traction belt is wound around the driving wheel and the driven wheel. The connecting seat is fixedly disposed on the flexible traction belt and connected to the other of the side door and the carriage. The push-pull motor can drive the driving wheel to rotate and drive the flexible traction belt and the connecting seat disposed on it to move together, thereby driving the side door and the carriage to slide relative to each other.

[0095] Alternatively, the flexible tension belt can be a belt, wire harness, or chain.

[0096] Optionally, the actuator can also be a rack and pinion drive pair. Specifically, the actuator includes a guide rack and a mating gear. The mating gear meshes with the guide rack and is connected to the output shaft of the reducer 300. The guide rack is used to connect to one of the side door and the carriage, and the brushless motor is used to connect to the other of the side door and the carriage.

[0097] As a third aspect of this utility model, a car body is provided, such as... Figure 11 , Figure 12 As shown, the vehicle body includes a passenger compartment 10 and at least one side door 20. The side door 20 is disposed on the side of the passenger compartment 10 and is movably connected to the passenger compartment 10. The vehicle body also includes a side door drive assembly 30 provided in this embodiment of the present invention, which is connected between the side door 20 and the passenger compartment 10.

[0098] Optionally, such as Figure 11 , Figure 12 As shown, the side of the carriage 10 is provided with a top guide rail 12, a middle guide rail 13 and a bottom guide rail 14. The top guide rail 12, the middle guide rail 13 and the bottom guide rail 14 all extend in the horizontal direction and are located at the top, side and bottom of the entrance and exit 11 on the side of the carriage 10, respectively. The side door 20 is movably disposed on the top guide rail 12, the middle guide rail 13 and the bottom guide rail 14 and can slide horizontally along the guide direction of the guide rail to selectively open or close the entrance and exit 11.

[0099] As an optional embodiment of this utility model, such as Figure 11 As shown, the position of the side door drive assembly 30 corresponds to the position of the middle guide rail 13, that is, its height is between the top guide rail 12 and the bottom guide rail 14, and it is located on the same side of the entrance and exit 11 as the middle guide rail 13.

[0100] As another optional embodiment of this utility model, such as Figure 12 As shown, the position of the side door drive assembly 30 corresponds to the bottom guide rail 14, that is, its height is below the entrance / exit 11.

[0101] The above are merely specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A brushless motor, comprising a rotor shaft (210), a magnetic structure, a stator core (230), and a plurality of stator windings (240), wherein the stator core (230) is arranged around the rotor shaft (210), the plurality of stator windings (240) are distributed circumferentially and are all wound on the stator core (230), the magnetic structure is fixedly disposed on the rotor shaft (210), and the stator windings (240) are capable of generating a magnetic field when energized to drive the magnetic structure to rotate the rotor shaft (210), characterized in that, The brushless motor also includes at least one magnetic induction sensor (610). At least one clearance groove (620) is provided on the surface of the stator core (230). The magnetic induction sensor (610) is at least partially accommodated in the clearance groove (620). The magnetic induction sensor (610) can generate a corresponding electrical signal in response to the change in the magnetic field strength when the magnetic structure rotates.

2. The brushless motor according to claim 1, characterized in that, The stator core (230) includes a connecting cylinder (231) and a plurality of winding portions (232) surrounding and connected to the outside of the connecting cylinder (231). A plurality of stator windings (240) are respectively wound on the plurality of winding portions (232). The magnetic structure includes a magnetic coil (280) and a magnetic coil frame (290). The magnetic coil (280) is arranged around the outside of the stator core (230) and has a plurality of magnetic poles distributed circumferentially. The magnetic coil frame (290) is connected between the magnetic coil (280) and the rotor shaft (210). The magnetic induction sensor (610) is disposed between adjacent winding portions (232). The clearance groove (620) is located on the surface of at least one winding portion (232) facing the adjacent winding portion (232).

3. The brushless motor according to claim 2, characterized in that, The winding section (232) includes a winding block and a limiting block. The winding block is connected between the limiting block and the connecting cylinder (231), and the circumferential width of the winding block is smaller than the circumferential width of the connecting cylinder (231). The stator winding (240) is wound on the winding block, and the clearance groove (620) is formed on the limiting block.

4. The brushless motor according to claim 2, characterized in that, The clearance groove (620) is formed on the winding portion (232) located on both sides of the magnetic induction sensor (610).

5. The brushless motor according to claim 2, characterized in that, The stator core (230) includes a plurality of first stator laminations (230a) and a plurality of second stator laminations (230b). The plurality of first stator laminations (230a) and the plurality of second stator laminations (230b) are stacked along the axial direction, and the plurality of second stator laminations (230b) are located on one side of the plurality of first stator laminations (230a) along the axial direction. The second stator laminations (230b) have clearance notches formed on them, and the clearance notches on the plurality of second stator laminations (230b) together form the clearance groove (620).

6. The brushless motor according to claim 5, characterized in that, The brushless motor further includes a top stator bracket (251) and a bottom stator bracket (252). The top stator bracket (251) and the bottom stator bracket (252) are respectively disposed on both sides of the stator core (230) along the axial direction and respectively cover the surfaces of both sides of the stator core (230) along the axial direction. The position of the bottom stator bracket (252) corresponds to the second stator lamination (230b), and a bracket groove (253) communicating with the clearance groove (620) is formed on the bottom stator bracket (252). The magnetic induction sensor (610) is partially disposed in the bracket groove (253).

7. The brushless motor according to claim 1, characterized in that, The stator core (230) includes a connecting cylinder (231) and a plurality of winding portions (232) that are connected around the outside of the connecting cylinder (231). The plurality of stator windings (240) are respectively wound on the plurality of winding portions (232). The magnetic structure includes a magnetic element (220). The magnetic element (220) is sleeved on the rotor shaft (210) and located in the connecting cylinder (231). The magnetic element (220) has a plurality of magnetic poles distributed circumferentially. The clearance groove (620) is located on the inner wall of the connecting cylinder (231).

8. The brushless motor according to any one of claims 1 to 6, characterized in that, The brushless motor also includes a reducer (300) and a circuit board (201). The reducer (300) and the circuit board (201) are respectively disposed on both sides of the stator core (230) along the axial direction of the rotor shaft (210). The circuit board (201) is electrically connected to the magnetic induction sensor (610). The reducer (300) is a planetary gear reducer, the sun gear of the reducer (300) is mounted on the rotor shaft (210), and the central shaft (310) of the reducer (300) forms the output shaft of the brushless motor.

9. A side door drive assembly, characterized in that, The device includes an actuator and a brushless motor as described in any one of claims 1 to 8, the brushless motor being fixedly connected to one of a side door and a passenger compartment of an automobile, the actuator being connected to the other of the side door and the passenger compartment, the actuator being connected to the output shaft of the brushless motor and capable of converting the rotational motion of the output shaft into a sliding motion of the side door relative to the passenger compartment.

10. A vehicle body, comprising a passenger compartment and at least one side door, the side door being disposed on the side of the passenger compartment and movably connected to the passenger compartment, characterized in that, The vehicle body also includes the side door drive assembly as described in claim 9, the side door drive assembly being connected between the side door and the passenger compartment.

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