Stator assembly, dual-rotor electric machine and wheel hub motor

Abstract

The application discloses a kind of stator assembly, dual-rotor motor and wheel hub motor, it is related to motor technical field, wherein, stator assembly, comprising: stator support, including a plurality of independent and annular array arrangement first space, and the first space at least one axial end portion is provided with the hollow hole of intercommunication, another axial end portion is provided with the second space of intercommunication, the second space intercommunication adjacent two first space;Stator coil, including a plurality of winding units, the winding unit is arranged in the first space, the first space is injected glue in clearance, the present stator assembly, dual-rotor motor and wheel hub motor can effectively solve the problem that stator assembly heat dissipation is limited and heat dissipation structure redundancy.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically, to a stator assembly, a dual-rotor motor, and a hub motor. Background Technology

[0002] Compared with conventional motors, radial dual-rotor motors can improve the torque density and efficiency of motors, and their market effect is particularly obvious in the direction of electric drive.

[0003] However, due to the dual rotor structure of the motor, the stator assembly is located between the inner and outer rotors and is enclosed by both, which limits the heat dissipation of the stator assembly. In the existing technology, the stator coil of the stator assembly is usually cooled by circulating cooling oil, which requires external oil circuits, oil tanks and drive components, resulting in too many redundant mechanisms, which is not conducive to product integration.

[0004] In summary, how to solve the problems of limited heat dissipation of stator components and redundancy of heat dissipation structures is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a stator assembly, a dual-rotor motor and a hub motor, which can effectively solve the problems of limited heat dissipation of the stator assembly and redundant heat dissipation structure.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A stator assembly, comprising:

[0008] The stator support includes several independent first spaces arranged in a ring array, and at least one axial end of the first space is provided with a communicating hollow hole, and the other axial end is provided with a communicating second space, the second space connecting two adjacent first spaces;

[0009] The stator coil includes several winding units, which are arranged one by one in the first space, and the gaps in the first space are filled with glue.

[0010] In some technical solutions, a reserved gap is provided between the outer wall of the winding unit and the inner wall of the first space for injection of adhesive.

[0011] In some technical solutions, the stator support includes a plurality of inserts arranged in a ring array and a main support and an auxiliary support fixedly connected to both ends of the inserts, with the first space formed between two adjacent inserts;

[0012] The perforated hole and the second space are respectively provided on the main support and the auxiliary support.

[0013] In some technical solutions, the auxiliary support includes a plurality of ribs arranged in a ring array, the end of the insert is fixed to the ribs, and at least part of the ribs are provided with openings for forming the second space within the auxiliary support.

[0014] In some technical solutions, the auxiliary support further includes a ring body, which includes an outer ring body and an inner ring body arranged coaxially. A plurality of ribs are arranged in a ring array between the outer ring body and the inner ring body. Two adjacent ribs, the inner ring body and the outer ring body form the hollow hole. Two adjacent hollow holes are connected through the through-hole to form the second space.

[0015] In some technical solutions, the rib plate includes a first rib plate, a second rib plate, and a third rib plate;

[0016] The two ends of the first rib are fixedly connected to the outer ring and the inner ring, respectively;

[0017] One end of the second rib is fixedly connected to the outer ring body, and the other end is provided with the opening between it and the inner ring body;

[0018] One end of the third rib is fixedly connected to the inner ring body, and the other end is provided with the opening between it and the outer ring body;

[0019] In this arrangement, several second ribs and third ribs are alternately arranged between two adjacent first ribs.

[0020] A dual-rotor motor includes an outer rotor assembly, an inner rotor assembly, and a stator assembly as described in any one of the above.

[0021] The outer rotor assembly is coaxially rotatably disposed on the outside of the stator assembly;

[0022] The inner rotor assembly is coaxially rotatably disposed inside the stator assembly.

[0023] In some technical solutions, the dual-rotor motor further includes a housing and axle that are rotatably mounted relative to each other;

[0024] The outer rotor assembly and the inner rotor assembly are fixedly connected to the housing;

[0025] The stator assembly is fixedly connected to the wheel axle.

[0026] In some technical solutions, the outer rotor assembly includes a plurality of outer rotor magnets, and the inner rotor assembly includes a plurality of inner rotor magnets;

[0027] The center points of the outer rotor magnet and the inner rotor magnet, which are in the same phase, are on the same radial line.

[0028] A hub motor, comprising the dual-rotor motor described in any one of the above claims;

[0029] The housing of the dual-rotor motor includes a first end cover, a second end cover, and a rim, which are coaxially fixed. The outer rotor assembly and the inner rotor assembly of the dual-rotor motor are respectively fixedly connected to the first end cover and / or the second end cover.

[0030] The stator assembly provided by the present invention has at least the following advantages compared with the prior art:

[0031] 1. An independent first space is set up in the stator support for the arrangement of independent winding units, and glue is injected into the first space to improve the mechanical and heat dissipation performance of the stator assembly.

[0032] 2. A second space is provided at the shaft end of the first space to connect the two adjacent first spaces. When injecting glue, the second space is placed at the bottom. When injecting glue into one of the first spaces, the glue can enter the adjacent first space through the second space. That is, the glue in the second first space is poured from bottom to top. During the process, the glue can be injected into the small gaps in the winding unit by means of the glue's own fluidity, thereby avoiding the gaps in the stator coil caused by insufficient glue injection, and further improving the mechanical performance and heat dissipation performance of the stator assembly.

[0033] The dual-rotor motor and hub motor provided by the present invention include the stator assembly described above and have the same beneficial effects. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0035] Figure 1 A cross-sectional view of the hub motor provided by the present invention;

[0036] Figure 2 This is a schematic diagram of the radial double air gap motor provided by the present invention;

[0037] Figure 3 This is a schematic diagram of the stator assembly provided by the present invention before glue injection;

[0038] Figure 4 This is a schematic diagram of the stator assembly provided by the present invention after glue injection;

[0039] Figure 5 Exploded views of the stator assembly provided by the present invention;

[0040] Figure 6 This is a schematic diagram of the assembly of the winding unit provided by the present invention in the first space;

[0041] Figure 7 This is a schematic diagram of the auxiliary support provided by the present invention;

[0042] Figure 8 This is a schematic diagram of the main support structure provided by the present invention;

[0043] Figure 9 This is a schematic diagram of the glue injection process for the stator assembly provided by the present invention;

[0044] Figure 10 Exploded views of the fixed bracket, inner rotor assembly, and outer rotor assembly provided in this invention;

[0045] Figure 11 This is an assembly diagram of the fixed bracket, inner rotor assembly, and outer rotor assembly provided by the present invention;

[0046] Figure 12 A cross-sectional view of the assembled fixed bracket, inner rotor assembly and outer rotor assembly provided by the present invention;

[0047] Figure 13 This is a schematic diagram of the structure of the first end cap provided by the present invention.

[0048] In the picture:

[0049] 1. External rotor assembly;

[0050] 11. Outer rotor core; 12. Outer rotor magnet;

[0051] 2. Stator assembly;

[0052] 21. Main support frame;

[0053] 211. End ring;

[0054] 212. Insert;

[0055] 2121. Insertion protrusion; 2122. Fin; 2123. Inner side stop; 2124. Outer side stop; 2125. First end stop;

[0056] 213. Connectors;

[0057] 214. First Space;

[0058] 215. Hollowed-out holes;

[0059] 22. Stator coils;

[0060] 221. Coil Unit;

[0061] 2211. Winding unit;

[0062] 22111, Winding coil; 22112, Coil support; 22113, Terminal;

[0063] 23. Auxiliary support;

[0064] 231. Ring body;

[0065] 2311. Outer ring body; 2312. Inner ring body;

[0066] 232. Ribs;

[0067] 2321. Insertion slot; 2322. Second end stop; 2323. First rib; 2324. Second rib; 2325. Third rib; 2326. Through opening;

[0068] 233. The Second Space;

[0069] 24. Leave a gap;

[0070] 25. Meridian;

[0071] 3. Internal rotor assembly;

[0072] 31. Inner rotor core; 32. Inner rotor magnet;

[0073] 4. Fixed bracket;

[0074] 41. Adjustment dial;

[0075] 411. First protrusion; 412. Adjustment hole; 4121. Fixing bolt; 413. First fixing hole;

[0076] 42. Positioning plate;

[0077] 421. Second convex portion; 422. Second fixing hole;

[0078] 5. First end cap;

[0079] 6. Second end cap;

[0080] 61. Positioning hole;

[0081] 7. Wheels and axles;

[0082] 8. Wheel rim;

[0083] 9. Injection mold. Detailed Implementation

[0084] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0085] The core of this invention is to provide a stator assembly, a dual-rotor motor, and a hub motor, which can effectively solve the problems of limited heat dissipation of the stator assembly and redundant heat dissipation structure.

[0086] Due to the dual-rotor structure of the motor, the stator assembly is located between the inner and outer rotors and is enclosed by both, which limits the heat dissipation of the stator assembly. This requires the configuration of an additional heat dissipation structure, resulting in redundancy in the motor structure and hindering product integration.

[0087] Example 1:

[0088] In view of the above problems, this application provides a stator assembly, including:

[0089] The stator support includes several independent first spaces 214 arranged in a ring array, and at least one axial end of the first space 214 is provided with a communicating hollow hole 215, and the other axial end is provided with a communicating second space 233, the second space 233 connecting two adjacent first spaces 214.

[0090] The stator coil 22 includes several winding units 2211, which are arranged one by one in the first space 214, and glue is injected into the gaps of the first space 214.

[0091] like Figures 2-9 As shown, several independent first spaces 214 are arranged in a ring array inside the stator bracket. Several winding units 2211 in the stator coil 22 are assembled into the first spaces 214 one by one, and glue is injected into the first spaces 214 to fix the winding units 2211 to the stator bracket, thereby improving the overall mechanical performance and heat dissipation performance of the stator assembly 2.

[0092] Meanwhile, a perforated hole 215 is provided at least one axial end of the first space 214, which helps to dissipate heat from the winding unit 2211. The perforated hole 215 can also be used as a glue injection hole for injecting glue into the first space 214. Furthermore, a second space 233 is provided at the other axial end of the first space 214, connecting two adjacent first spaces 214. Therefore, when glue is injected into one of the first spaces 214, the glue can flow into the adjacent first space 214 through the second space 233. If, during glue injection, ... Figure 9As shown, the second space 233 is set at the bottom of the first space 214, and the openings other than the two axial ends are closed by the glue injection mold 9. Then the glue in the second first space 214 is injected from bottom to top. During this process, the glue in the two first spaces 214 can fully wet the winding unit 2211 assembled in the first space 214 by means of its own fluidity and diffusion, and complete the filling of the small gaps in the winding unit 2211. This avoids the internal voids caused by insufficient glue injection, which helps to further improve the mechanical performance and heat dissipation performance of the stator assembly 2. Moreover, by injecting glue into the stator assembly 2 to improve the heat dissipation performance of the stator assembly 2, there is no need to configure additional heat dissipation equipment, which effectively solves the problem of redundant heat dissipation structure and facilitates the integrated design of the product.

[0093] In some embodiments, a reserved gap 24 is provided between the outer wall of the winding unit 2211 and the inner wall of the first space 214 for injecting adhesive.

[0094] The winding unit 2211 includes a winding coil 22111 and a coil support 22112. The winding coil 22111 is wound around the outside of the coil support 22112. When the winding unit 2211 is assembled into the first space 214, the two ends of the coil support 22112 abut against the inner wall of the first space 214, thereby forming a reserved gap 24 between the winding coil 22111 and the inner wall of the first space 214 to allow the adhesive to flow, thereby increasing the adhesive injection speed.

[0095] In some embodiments, the stator support includes a plurality of inserts 212 arranged in a ring array and a main support 21 and an auxiliary support 23 fixedly connected to both ends of the inserts 212 respectively, and a first space 214 is formed between two adjacent inserts 212.

[0096] The perforated hole 215 and the second space 233 are respectively provided on the main support 21 and the auxiliary support 23.

[0097] like Figures 5-8 As shown, the stator support adopts a frame structure composed of main support 21 and auxiliary support 23 to provide overall support for stator assembly 2, thereby improving the mechanical performance of stator assembly 2. The frame structure also helps to reduce the weight of stator assembly 2 and achieve lightweight design.

[0098] Meanwhile, the stator support is divided into several independent first spaces 214 by a number of inserts 212 arranged in a ring array inside the stator support, which facilitates the assembly of several winding units 2211 in the stator coil 22 and ensures the stability of the relative positional relationship of the multiple winding units 2211.

[0099] In some cases, the insert 212 includes fins 2122, the root of which is fixedly connected to the main support 21, and the end of the fins 2122 is provided with insertion protrusions 2121; the auxiliary support 23 is provided with a number of insertion slots 2321 arranged in a ring array, and the insertion protrusions 2121 and insertion slots 2321 are inserted and fixed one-to-one. That is, the assembly design of the main support 21 and the auxiliary support 23 enables the main support 21 and the winding unit 2211 to be assembled first, and then fixed by the auxiliary support 23, which improves the assembly convenience of the winding unit 2211 and thus improves the assembly efficiency.

[0100] In some embodiments, the auxiliary support 23 includes a plurality of ribs 232 arranged in a ring array, the end of the insert 212 is fixed to the ribs 232, and at least a portion of the ribs 232 are provided with openings 2326 for forming a second space 233 within the auxiliary support 23.

[0101] like Figures 3-7 As shown, the auxiliary bracket 23 is provided with a rib plate 232 for fixing to the insert 212 and for separating the first space 214 on both sides of the insert 212. By providing a through-hole 2326 at the rib plate 232, the first space 214 on both sides of the insert 212 can be connected by the through-hole 2326. That is, the through-hole 2326 can be used as a component of the second space 233 for the flow of adhesive during glue injection.

[0102] In some embodiments, the auxiliary support 23 further includes a ring body 231, which includes an outer ring body 2311 and an inner ring body 2312 arranged coaxially. A plurality of ribs 232 are arranged in a ring array between the outer ring body 2311 and the inner ring body 2312. Two adjacent ribs 232, the inner ring body 2312 and the outer ring body 2311 form a hollow hole 215. Two adjacent hollow holes 215 are connected through a through-hole 2326 to form a second space 233.

[0103] like Figure 5 and Figure 7 As shown, the auxiliary bracket 23, through the structural design of the ring body 231 and the rib plate 232, achieves lightweighting while generating hollow holes 215, which helps to improve the heat dissipation performance of the stator assembly 2. At the same time, by setting openings 2326 in some of the rib plates 232, the auxiliary bracket 23 forms a second space 233, allowing the adhesive in the adjacent first space 214 to flow to each other.

[0104] In some embodiments, the rib 232 includes a first rib 2323, a second rib 2324, and a third rib 2325;

[0105] The two ends of the first rib 2323 are fixedly connected to the outer ring 2311 and the inner ring 2312, respectively;

[0106] One end of the second rib 2324 is fixedly connected to the outer ring body 2311, and the other end is provided with a through opening 2326 between it and the inner ring body 2312;

[0107] One end of the third rib 2325 is fixedly connected to the inner ring 2312, and the other end is provided with a through 2326 between it and the outer ring 2311.

[0108] Among them, several second ribs 2324 and third ribs 2325 are alternately arranged between two adjacent first ribs 2323.

[0109] like Figures 3-7 As shown, the stator coil 22 includes several coil units 221 of different phases, and each coil unit 221 includes several winding units 2211. Taking a three-phase motor as an example, each phase wire in the stator coil 22 includes three coil units 221, and each coil unit 221 includes three independent winding units 2211. Glue is applied in units of one coil unit 221, that is, the three first spaces 214 corresponding to one coil unit 221 are connected through a second space 233, as shown. Figure 7 As shown, a second space 233 is formed within the auxiliary support 23 corresponding to the three first spaces 214. That is, a second space 233 is formed between two adjacent first ribs 2323. The openings 2326 provided in the second rib 2324 and the third rib 2325 are used to connect the adjacent first spaces 214. When applying glue, the first space 214 in the middle is the main glue application space. The glue flows to the first spaces 214 on both sides through the openings 2326 of the second rib 2324 and the third rib 2325, thereby completing the glue application of one coil unit 221. Therefore, for this stator assembly 2, only nine glue application nozzles are needed to meet the simultaneous glue application of all coil units 221 of the stator assembly 2.

[0110] Example 2:

[0111] This application also provides a dual-rotor motor, including an outer rotor assembly 1, an inner rotor assembly 3, and a stator assembly 2 of any one of the above.

[0112] The outer rotor assembly 1 is coaxially rotatably disposed on the outside of the stator assembly 2;

[0113] The inner rotor assembly 3 is coaxially rotatably disposed inside the stator assembly 2.

[0114] like Figure 1 and Figure 2 As shown, the inner rotor assembly 3 and the outer rotor assembly 1 are coaxially rotatably mounted on the inner and outer sides of the stator assembly 2, respectively. In some cases, the outer rotor assembly 1 and the inner rotor assembly 3 provide independent power output, while in other cases, the outer rotor assembly 1 and the inner rotor assembly 3 are coaxially fixed and provide power output together.

[0115] In some embodiments, the dual-rotor motor further includes a housing and axle 7 that are rotatably mounted relative to each other;

[0116] The outer rotor assembly 1 and the inner rotor assembly 3 are fixedly connected to the housing;

[0117] The stator assembly 2 is fixedly connected to the wheel axle 7.

[0118] like Figure 1 As shown, in some cases, the wheel axle 7 is fixed to the stator assembly 2, while the outer rotor assembly 1 and the inner rotor assembly 3 are fixed by the housing and jointly output power.

[0119] In some cases, the stator assembly 2 is fixed to the housing, while the outer rotor assembly 1 and the inner rotor assembly 3 are both fixed to the wheel axle 7, and together they output power.

[0120] In some embodiments, the outer rotor assembly 1 includes a plurality of outer rotor magnets 12, and the inner rotor assembly 3 includes a plurality of inner rotor magnets 32;

[0121] The center points of the outer rotor magnet 12 and the inner rotor magnet 32, which are in the same phase, are on the same radial line 25.

[0122] like Figure 1 and Figure 11 As shown, the outer rotor assembly 1 and the inner rotor assembly 3 are coaxially fixed and jointly output power. The magnetic lines of force emitted by the outer rotor magnet 12 in the outer rotor assembly 1 pass through the stator assembly 2 and are absorbed by the inner rotor magnet 32 ​​in the inner rotor assembly 3, effectively shortening the magnetic flux path and realizing a short loop. There is no need to rely on the iron yoke in the stator assembly 2 for magnetic conduction, which helps to reduce the thickness of the iron yoke in the stator assembly 2 or directly eliminate the iron yoke, thereby reducing the weight of the stator assembly 2 and realizing the lightweighting of the motor.

[0123] Meanwhile, the center points of the outer rotor magnet 12 and the inner rotor magnet 32 ​​with the same phase are on the same radial line 25, which can minimize the magnetic flux path, further reduce magnetic flux loss, and thus improve the power density of the motor.

[0124] Example 3:

[0125] This application also provides a hub motor, including any of the above-mentioned dual-rotor motors;

[0126] The housing of the dual-rotor motor includes a first end cover 5, a second end cover 6 and a rim 8 that are coaxially fixed. The outer rotor assembly 1 and the inner rotor assembly 3 of the dual-rotor motor are fixedly connected to the first end cover 5 and / or the second end cover 6, respectively.

[0127] When the aforementioned dual-rotor motor is applied to a hub motor, its housing can serve as the first end cover 5, the second end cover 6, and the wheel rim 8. The first end cover 5 and the second end cover 6 are used to fix the outer rotor assembly 1 and the inner rotor assembly 3, thereby enabling the outer rotor assembly 1 and the inner rotor assembly 3 to simultaneously drive the wheel rim 8 to rotate relative to the wheel axle 7.

[0128] Example 4:

[0129] This application also provides a stator support for supporting the arrangement of the winding unit 2211 within the stator assembly 2;

[0130] Stator support, including:

[0131] A number of inserts 212 arranged in a ring array about the axis of stator assembly 2, with a first space 214 formed between two adjacent inserts 212 for accommodating winding units 2211;

[0132] The main support 21 and the auxiliary support 23 are arranged sequentially along the axis of the stator assembly 2. The main support 21 and the auxiliary support 23 are respectively fixedly connected to the two ends of a number of inserts 212.

[0133] like Figures 3-8 As shown, the main support 21 and the auxiliary support 23 at both ends are fixedly connected by the insert 212, so that the main support 21, the auxiliary support 23 and the several inserts 212 form a stable stator support. When combined with the stator coil 22, a stable stator assembly 2 is formed to improve the structural stability of the stator assembly 2 during motor operation.

[0134] Furthermore, several inserts 212 divide the stator bracket into several independent first spaces 214, and arrange the several independent winding units 2211 contained in the stator coil 22 one by one in the first spaces 214 to complete the assembly of the stator coil 22 and the stator bracket. After the assembly is completed, the several winding units 2211 have a stable relative positional relationship with the assistance of the stator bracket. During operation, the stator bracket provides axial and radial support to the stator coil 22, thereby improving the overall structural stability of the stator coil 22 and the stability of the relative positional relationship of the several winding units 2211 contained in the stator coil 22, thereby ensuring the stability of the motor during operation.

[0135] Meanwhile, the main bracket 21 is also equipped with a connector 213 for connecting to the fixed end of the motor.

[0136] In some embodiments, the insert 212 includes fins 2122, which are coplanar with the axis of the stator support, and two adjacent fins 2122 form a fan-shaped first space 214.

[0137] like Figure 5 and Figure 8 As shown, the insert 212 includes plate-shaped fins 2122, which can effectively separate adjacent first spaces 214 and provide stable support for the winding unit 2211 along the tangential direction. At the same time, the fins 2122 are coplanar with the axis of the stator support, thereby making the first space 214 between adjacent fins 2122 a fan-shaped structure, which facilitates the winding units 2211 of the stator coil 22 to be arranged in a ring array.

[0138] In some embodiments, side stops are provided on both radial sides of the insert 212 or inside the main bracket 21 and auxiliary bracket 23 to abut against the two radial side walls of the fixed winding unit 2211.

[0139] By setting side stops on the radial sides of the insert 212 or in the main bracket 21 and auxiliary bracket 23, when the winding unit 2211 is assembled with the first space 214, the side stops can abut against the radial side walls of the winding unit 2211 to radially limit the winding unit 2211, thereby ensuring the stability of the positional relationship of the winding unit 2211 in the first space 214.

[0140] like Figure 5 and Figure 6 As shown, inner sidewalls 2123 and outer sidewalls 2124 are respectively provided on the two side walls of the radially arranged fins 2122 of the insert 212. When the winding unit 2211 is assembled into the first space 214, the inner sidewall 2123 abuts against the side of the winding unit 2211 near the axis, and the outer sidewall 2124 abuts against the side of the winding unit 2211 away from the axis, thereby achieving radial limitation of the winding unit 2211.

[0141] In some embodiments, end stops are provided at both axial ends of the insert 212 or within the main bracket 21 and auxiliary bracket 23 to abut against the shaft end of the fixed winding unit 2211.

[0142] By setting end stops at both ends of the insert 212 or in the main bracket 21 and auxiliary bracket 23, when the winding unit 2211 is assembled into the first space 214, the end stops abut against both ends of the winding unit 2211, thereby limiting the winding unit 2211 axially and ensuring the stability of the positional relationship of the winding unit 2211 in the first space 214.

[0143] like Figure 5 As shown, a first end stop 2125 is provided in the main bracket 21, and a second end stop 2322 is provided in the auxiliary bracket 23. When the winding unit 2211 is assembled into the first space 214, the first end stop 2125 and the second end stop 2322 respectively abut against the shaft end of the corresponding end of the winding unit 2211, thereby limiting the axial movement of the winding unit 2211.

[0144] In some cases, the main support 21 includes an end ring 211, which includes an inner ring and an outer ring arranged concentrically, and a connecting plate is provided between the inner ring and the outer ring. The end of the insert 212 is fixedly connected to the connecting plate, and the portion of the connecting plate that extends beyond the plane of the insert 212 forms a first end stop 2125.

[0145] The auxiliary support 23 includes a ring body 231, which includes an outer ring body 2311 and an inner ring body 2312 arranged concentrically. A rib plate 232 is provided between the outer ring body 2311 and the inner ring body 2312. The other end of the insert 212 is fixedly connected to the rib plate 232, and the portion of the rib plate 232 that extends beyond the plane of the insert 212 forms a second end stop 2322.

[0146] In some embodiments, the main support 21 and / or the auxiliary support 23 are provided with perforated holes 215 at positions corresponding to the first space 214.

[0147] like Figures 2-9 As shown, perforated holes 215 are provided at the positions corresponding to the main bracket 21 and / or auxiliary bracket 23 and the first space 214, which facilitates heat dissipation of the winding unit 2211 in the first space 214. At the same time, in some cases, glue can be injected into the first space 214 through the perforated holes 215 to further improve the stability and heat dissipation capacity of the winding unit 2211 in the first space 214.

[0148] In some embodiments, the first end of the insert 212 is integrally formed with the main bracket 21, and the second end of the insert 212 is provided with a plugging protrusion 2121;

[0149] The auxiliary support 23 is arranged in a ring array with several insertion slots 2321, and the insertion protrusions 2121 are inserted and fixed into the insertion slots 2321 one by one.

[0150] like Figure 5 As shown, to facilitate the assembly of the winding unit 2211, in some cases, the main support 21 and the auxiliary support 23 are designed independently, and the insert 212 is integrally formed with the main support 21, while the auxiliary support 23 is fixed to the insert 212 by plugging. Thus, during assembly, the winding unit 2211 can be assembled with the main support 21 first, followed by the assembly of the auxiliary support 23 with the main support 21. By plugging and fixing the insert 212 with the auxiliary support 23, the main support 21 and the auxiliary support 23 form a stable frame, which improves the assembly efficiency of the winding unit 2211 while ensuring the stability of the stator support.

[0151] like Figure 5As shown, the surface of the auxiliary bracket 23 is provided with several insertion slots 2321 for the insertion of the insert 212. When the insert 212 is inserted into the insertion slot 2321, it can be fixed by riveting, which further ensures the insertion stability of the insert 212 and the auxiliary bracket 23.

[0152] In some embodiments, the auxiliary support 23 includes a plurality of ribs 232 arranged in a ring array, and the insertion slot 2321 is disposed on the ribs 232;

[0153] When the winding unit 2211 is arranged in the first space 214, the shaft end of the winding unit 2211 abuts against the rib plate 232.

[0154] like Figure 5 As shown, the auxiliary support 23 is provided with several ribs 232, and hollow holes 215 are formed between adjacent ribs 232, which helps the winding unit 2211 to dissipate heat. At the same time, the insertion slot 2321 is provided on the rib 232. When the insertion protrusion 2121 is inserted into the insertion slot 2321, the end of the insert 212 corresponding to the insertion protrusion 2121 abuts against the surface of the rib 232, thereby realizing the axial positioning of the main support 21 and the auxiliary support 23 and ensuring the stability of the assembly relationship between the main support 21 and the auxiliary support 23.

[0155] In some embodiments, the auxiliary bracket 23 further includes a plurality of through-holes 2326 for through-reception of the wiring terminals 22113 inside the winding unit 2211;

[0156] The two adjacent ports 2326 are respectively located on the side closer to the axis of the stator assembly 2 and on the side farther away from the axis of the stator assembly 2.

[0157] like Figure 3 , Figure 5 and Figure 7 As shown, multiple openings 2326 are provided at different positions on the auxiliary bracket 23. When assembling the winding unit 2211, the terminals 22113 of the winding unit 2211 are allowed to pass through and be accommodated in the openings 2326. At the same time, the terminals 22113 of adjacent winding units 2211 can be connected in the openings 2326, thereby facilitating the electrical connection of the winding units 2211 and the arrangement of the terminals 22113 in different first spaces 214.

[0158] Example 5:

[0159] This application also provides a radial dual-air gap motor, comprising:

[0160] Stator assembly 2;

[0161] The outer rotor assembly 1 is coaxially rotatably disposed on the outside of the stator assembly 2;

[0162] The inner rotor assembly 3 is coaxially rotatably disposed inside the stator assembly 2;

[0163] Among them, the projections of the outer rotor assembly 1, the stator assembly 2 and the inner rotor assembly 3 in the direction perpendicular to their own axes at least partially overlap.

[0164] like Figures 1-13 As shown, the inner rotor assembly 3 and the outer rotor assembly 1 are coaxially arranged on the inner and outer sides of the stator assembly 2, and the projections of the outer rotor assembly 1, the stator assembly 2 and the inner rotor assembly 3 in the direction perpendicular to their own axes overlap at least partially. The magnetic lines of force generated by the magnets inside the overlapping part of the outer rotor assembly 1 can pass through the stator assembly 2 and be directly absorbed by the magnets inside the inner rotor assembly 3. There is no need to rely on the iron yoke to achieve magnetic circuit closure, which effectively shortens the magnetic flux path and reduces magnetic field loss. In addition, the inner rotor assembly 3 and the outer rotor assembly 1 can do work at the same time, improve the overall output power density of the motor and meet the power output requirements of the product.

[0165] Meanwhile, the new magnetic flux path eliminates the need for magnetic conduction of the iron yoke inside the stator assembly 2, thus reducing or eliminating the iron yoke design inside the stator assembly 2, thereby achieving a lighter motor. Furthermore, the inner rotor assembly 3, stator assembly 2, and outer rotor assembly 1 are arranged radially, effectively reducing the axial space occupied by the motor, which facilitates space arrangement within the product.

[0166] In some embodiments, the outer rotor assembly 1 includes an outer rotor core 11 and a plurality of outer rotor magnets 12;

[0167] The outer rotor core 11 has a ring structure, and several outer rotor magnets 12 are arranged in a ring array on the inner ring wall of the outer rotor core 11.

[0168] When the outer rotor assembly 1 rotates at high speed, the outer rotor magnet 12 bears the outward centrifugal force, and the outer rotor core 11 provides the opposite support force to the outer rotor magnet 12. Therefore, the outer rotor magnet 12 is arranged on the inner ring wall of the outer rotor core 11 by a bonding method, which can effectively prevent the outer rotor magnet 12 from detaching when the outer rotor assembly 1 rotates at high speed. At the same time, arranging the outer rotor magnet 12 by bonding instead of arranging it by slotting can effectively reduce the rigid damage to the outer rotor core 11, help reduce the thickness of the outer rotor core 11, thereby realizing the lightweight design of the outer rotor assembly 1 and reducing the space occupied by the outer rotor assembly 1.

[0169] In some embodiments, the outer rotor assembly 1 includes a plurality of surface-mounted outer rotor magnets 12;

[0170] The outer rotor assembly 1 is provided with a protective sleeve on the external coaxial fixing sleeve to restrict the radial movement of the outer rotor magnet 12.

[0171] By adding a protective sleeve to the outside of the outer rotor assembly 1, the outer rotor magnet 12 of the outer rotor assembly 1 is radially limited to prevent the outer rotor magnet 12 from shifting under the action of centrifugal force.

[0172] In some cases, radial double air gap motors are used as hub motors, where the rim 8 of the hub motor can be used as a protective sleeve to limit the radial displacement of the outer rotor magnet 12.

[0173] In some embodiments, the inner rotor assembly 3 includes an inner rotor core 31 and a plurality of inner rotor magnets 32;

[0174] The inner rotor core 31 is provided with several magnetic steel slots arranged in a ring array, and the inner rotor magnets 32 are fixedly embedded in the magnetic steel slots.

[0175] like Figure 10 and Figure 11 As shown, compared to the outer rotor assembly 1, the inner rotor assembly 3 has a lower linear velocity of its inner rotor magnet 32 ​​and bears a relatively smaller centrifugal force. Therefore, the inner rotor magnet 32 ​​is fixed by embedding, such as arranging several magnet slots in a ring array inside the inner rotor core 31 to arrange the inner rotor magnet 32. At the same time, the differentiated arrangement of the inner rotor magnet 32 ​​and the outer rotor magnet 12 can balance the magnetic field loss of the inner rotor assembly 3 and the outer rotor assembly 1, thereby enabling the inner rotor assembly 3 and the outer rotor assembly 1 to provide balanced output power and ensure the smooth operation of the motor.

[0176] In some embodiments, the outer rotor assembly 1 and the inner rotor assembly 3 are coaxially fixed relative to each other;

[0177] The outer rotor assembly 1 and the inner rotor assembly 3 have the same number of magnets, and the center points of the magnets of the outer rotor assembly 1 and the inner rotor assembly 3, which are in the same phase, are on the same radial line 25.

[0178] like Figure 10 and Figure 11 As shown, when the outer rotor assembly 1 and the inner rotor assembly 3 are fixed coaxially, that is, when the motor is doing work, the magnetic lines of force generated by the outer rotor magnet 12 directly pass through the stator assembly 2 and are absorbed by the inner rotor magnet 32. By making the center points of the outer rotor magnet 12 and the inner rotor magnet 32, which are in the same phase, lie on the same radial line 25, the fitting degree between the magnetic lines of force and the radial line 25 can be improved, the magnetic flux path can be further shortened, the magnetic field loss can be reduced, and the output power density can be increased.

[0179] In some embodiments, the radial dual air gap motor further includes a fixed bracket 4, and the outer rotor assembly 1 and the inner rotor assembly 3 are coaxially and fixedly connected through the fixed bracket 4.

[0180] The fixed bracket 4 includes an arc-shaped adjustment hole 412, the center of which overlaps with the axis of the outer rotor assembly 1 and / or the inner rotor assembly 3.

[0181] The outer rotor assembly 1 and / or the inner rotor assembly 3 are fixedly connected to the adjustment hole 412. By adjusting the fixed position of the outer rotor assembly 1 and / or the inner rotor assembly 3 in the adjustment hole 412, the phase angle between the outer rotor assembly 1 and the inner rotor assembly 3 is adjusted.

[0182] like Figure 10 , Figure 11 and Figure 12 As shown, the inner rotor assembly 3 and the outer rotor assembly 1 are coaxially fixed by the fixing bracket 4. One of the inner rotor assembly 3 and the outer rotor assembly 1 is directly coaxially fixed to the fixing bracket 4, and the other is fixedly connected to the adjustment hole 412 by the fixing bolt 4121. During assembly, the phase angle between the inner rotor assembly 3 and the outer rotor assembly 1 is adjusted by adjusting the position of the fixing bolt 4121 in the adjustment hole 412 to ensure that the center points of the inner rotor magnet 32 ​​and the outer rotor magnet 12, which are in the same phase, are on the same radial line 25.

[0183] For example, the inner rotor assembly 3 is directly fixedly connected to the fixed bracket 4, and the outer rotor assembly 1 is fixedly connected to the adjustment hole 412 by the fixing bolt 4121.

[0184] The arc center of the adjustment hole 412 overlaps with the axis of the inner rotor assembly 3 and / or the outer rotor assembly 1, thereby ensuring the coaxiality of the inner rotor assembly 3 and the outer rotor assembly 1 before and after adjustment.

[0185] In some embodiments, the radial dual air gap motor further includes a fixed bracket 4 and a housing;

[0186] The outer rotor assembly 1 is fixed coaxially with the housing, the inner rotor assembly 3 is fixed coaxially with the fixed bracket 4, and the fixed bracket 4 is fixed coaxially with the housing;

[0187] The fixed bracket 4 includes an arc-shaped adjustment hole 412. The center of the arc of the adjustment hole 412 overlaps with the axis of the outer rotor assembly 1 and / or the inner rotor assembly 3. By adjusting the fixed position of the housing within the adjustment hole 412, the phase angle between the outer rotor assembly 1 and the inner rotor assembly 3 can be adjusted.

[0188] like Figure 10 , Figure 11 and Figure 12 As shown, the inner rotor assembly 3 is directly fixedly connected to the fixed bracket 4, the outer rotor assembly 1 is fixedly connected to the housing, and the housing is fixedly connected to the adjustment hole 412 by the fixing bolt 4121. By adjusting the position of the fixing bolt 4121 in the adjustment hole 412, the phase angle between the housing and the outer rotor assembly 1 and the inner rotor assembly 3 can be adjusted.

[0189] In some embodiments, the housing includes a first end cap 5 and a second end cap 6 that are relatively fixed.

[0190] The outer rotor assembly 1 is coaxially fixed with the first end cover 5, and the fixing bracket 4 is fixedly connected with the second end cover 6.

[0191] like Figure 1 and Figure 13 As shown, the second end cover 6 includes positioning holes 61 arranged in a ring array. The positioning holes 61 are fixedly connected to the adjustment holes 412 by fixing bolts 4121, thereby realizing the coaxial fixation of the inner rotor assembly 3 and the second end cover 6. Since the first end cover 5 and the second end cover 6 are coaxially fixed, the inner rotor assembly 3 and the outer rotor assembly 1 are coaxially fixed.

[0192] Example 6:

[0193] This application also provides a fixing bracket 4 for coaxially fixing the outer rotor assembly 1 and the inner rotor assembly 3 of a radial double air gap motor;

[0194] The fixed bracket 4 includes a relatively fixed fixing part and an adjusting part;

[0195] The fixing part is used for fixed connection with one of the outer rotor assembly 1 and the inner rotor assembly 3;

[0196] The adjustment part includes an arc-shaped adjustment hole 412 for fixed connection with another of the outer rotor assembly 1 and the inner rotor assembly 3 by bolts, and after connection, the arc center of the adjustment hole 412 overlaps with the axis of the outer rotor assembly 1 and the inner rotor assembly 3.

[0197] like Figures 10-13 As shown, the fixed bracket 4 includes a fixing part and an adjusting part, which are fixedly connected to the inner rotor assembly 3 and the outer rotor assembly 1 respectively, as shown. Figure 12 As shown, the fixing part of the fixed bracket 4 is fixedly connected to the inner rotor assembly 3, and the adjusting part is fixedly connected to the outer rotor assembly 1. The adjusting part is provided with an arc-shaped adjusting hole 412. The outer rotor assembly 1 is fixed to the adjusting hole 412 by a fixing bolt 4121. By adjusting the fixing position of the fixing bolt 4121 in the adjusting hole 412, the phase angle between the inner rotor assembly 3 and the outer rotor assembly 1 is adjusted, thereby eliminating the influence of the magnet assembly accuracy on the relative position of the inner rotor magnet 32 ​​and the outer rotor magnet 12 in the same phase. This makes the inner rotor magnet 32 ​​and the outer rotor magnet 12 in the same phase on the same radial line 25, thereby enabling the magnets formed by the magnets in the inner rotor assembly 3 and the outer rotor assembly 1 to obtain the shortest magnetic flux path and improve the output power density of the motor.

[0198] It should be noted that the arc center of the adjusting hole 412 overlaps with the axis of the outer rotor assembly 1 and / or the inner rotor assembly 3. Therefore, when adjusting the position of the fixing bolt 4121 in the adjusting hole 412, only the phase angle between the inner rotor assembly 3 and the outer rotor assembly 1 is changed, without affecting the coaxiality of the inner rotor assembly 3 and the outer rotor assembly 1.

[0199] In some embodiments, the fixing part is a cylindrical structure, used for coaxially fixing and mounting with the outer rotor assembly 1 or the inner rotor assembly 3.

[0200] The adjusting part is a ring structure, and the cylindrical structure is coaxially and fixedly connected to the ring structure.

[0201] like Figure 10 As shown, the fixing part is a cylindrical structure, which is fitted with the inner circumferential wall of the inner rotor assembly 3 with an interference fit or clearance fit. The adjusting part is an annular structure, which is coaxially fixed with the fixing part and is set on the inner circumferential wall of the cylindrical structure to increase the rigidity of the cylindrical structure.

[0202] In some cases, the fixing part is fitted with an interference fit or clearance fit on the outer peripheral wall of the outer rotor assembly 1, and the adjusting part is fixedly set on the outer peripheral wall of the cylindrical structure, which can also achieve the purpose of increasing the rigidity of the cylindrical structure.

[0203] In some embodiments, limiting protrusions are provided at both axial ends of the cylindrical structure for contacting and limiting the outer rotor assembly 1 or the inner rotor assembly 3.

[0204] like Figure 10 and Figure 12 As shown, limiting protrusions are provided at both ends of the cylindrical structure. When the cylindrical structure and the inner rotor assembly 3 are assembled, the limiting protrusions at both ends of the cylindrical structure abut against the shaft ends of the inner rotor assembly 3, thereby achieving axial limiting of the cylindrical structure and the inner rotor assembly 3, and thus ensuring the stability of the relative positional relationship between the inner rotor assembly 3 and the fixed part.

[0205] In some cases, the cylindrical structure is fitted onto the outer peripheral wall of the outer rotor assembly 1, and the limiting protrusion abuts against the shaft end of the outer rotor assembly 1 to limit the axial positioning of the cylindrical structure and the outer rotor assembly 1, thereby ensuring the stability of the relative positional relationship between the outer rotor assembly 1 and the fixed part.

[0206] In some embodiments, the fixing part includes an adjusting disc 41 and a positioning disc 42 that are spliced ​​and fixed along the axial direction;

[0207] Limiting protrusions are provided at the shaft ends of the adjusting disc 41 and the positioning disc 42 that are far apart from each other.

[0208] like Figure 10As shown, the fixing part includes an adjustment plate 41 and a positioning plate 42. The two are assembled and fixed after moving relative to each other along the axial direction. That is, they are assembled with the inner rotor assembly 3 from both ends of the axial direction, thereby reducing the assembly difficulty. After assembly, the first protrusion 411 of the adjustment plate 41 and the second protrusion 421 of the positioning plate 42 respectively abut against and limit the two shaft ends of the inner rotor assembly 3.

[0209] In some embodiments, the end faces of the adjusting disk 41 and the positioning disk 42 that are connected are provided with stepped surfaces that fit together.

[0210] like Figure 10 and Figure 12 As shown, stepped surfaces that fit together are provided on the mating surfaces of the adjusting plate 41 and the positioning plate 42, thereby ensuring the coaxiality of the adjusting plate 41 and the positioning plate 42 after assembly.

[0211] In some embodiments, the adjusting plate 41 and the positioning plate 42 are respectively provided with a first fixing hole 413 and a second fixing hole 422 for bolt connection at corresponding positions;

[0212] The first fixing hole 413 and the second fixing hole 422 are respectively provided on the protrusions on the inner peripheral walls of the adjusting plate 41 and the positioning plate 42.

[0213] like Figure 10 As shown, by providing a first fixing hole 413 and a second fixing hole 422 in the adjusting plate 41 and the positioning plate 42 respectively, it is convenient to fix the relative position of the adjusting plate 41 and the positioning plate 42 with screws. Moreover, by setting the first fixing hole 413 and the second fixing hole 422 on the inner wall protrusions of the adjusting plate 41 and the positioning plate 42, the rigidity reduction caused by drilling holes in the cylindrical structure is avoided, which helps to reduce the wall thickness of the cylindrical structure and thus achieve lightweight design.

[0214] In some embodiments, the adjustment part is coaxially fixedly disposed on the inner peripheral wall of the adjustment disk 41, the first fixing hole 413 is disposed on the adjustment part, and the protrusion of the inner peripheral wall of the positioning disk 42 abuts against the side wall of the adjustment part.

[0215] The annular structure of the adjustment part is provided on the inner peripheral wall of the adjustment disk 41 to increase the rigidity of the adjustment disk 41. The first fixing hole 413 is provided on the annular structure of the adjustment part, and the protrusion of the inner peripheral wall of the positioning disk 42 abuts against the adjustment part to realize the axial positioning of the positioning disk 42 and the adjustment disk 41.

[0216] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0217] The stator assembly, dual-rotor motor, and hub motor provided by this invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A stator assembly, characterized in that, include: The stator support includes several independent first spaces (214) arranged in a ring array, and at least one axial end of the first space (214) is provided with a communicating hollow hole (215), and the other axial end is provided with a communicating second space (233), the second space (233) connecting two adjacent first spaces (214). The stator coil (22) includes several winding units (2211), which are arranged one by one in the first space (214), and the gaps in the first space (214) are filled with glue; The stator support includes an auxiliary support (23), which includes a ring (231) and a plurality of ribs (232) arranged in a ring array. The ring (231) includes an outer ring (2311) and an inner ring (2312) arranged coaxially. At least a portion of the ribs (232) are provided with openings (2326) for forming the second space (233) within the auxiliary support (23). The rib (232) includes a first rib (2323), a second rib (2324) and a third rib (2325); The two ends of the first rib (2323) are fixedly connected to the outer ring body (2311) and the inner ring body (2312), respectively; One end of the second rib (2324) is fixedly connected to the outer ring body (2311), and the other end is provided with a through opening (2326) between it and the inner ring body (2312). One end of the third rib (2325) is fixedly connected to the inner ring (2312), and the other end is provided with a through (2326) between it and the outer ring (2311). A number of second ribs (2324) and third ribs (2325) are alternately arranged between two adjacent first ribs (2323).

2. The stator assembly according to claim 1, characterized in that, A reserved gap (24) is provided between the outer wall of the winding unit (2211) and the inner wall of the first space (214) for injecting glue.

3. The stator assembly according to claim 1, characterized in that, The stator support includes a plurality of inserts (212) arranged in a ring array and a main support (21) and an auxiliary support (23) fixedly connected to both ends of the inserts (212), with the first space (214) formed between two adjacent inserts (212). The perforated hole (215) and the second space (233) are respectively provided on the main support (21) and the auxiliary support (23).

4. The stator assembly according to claim 3, characterized in that, The end of the insert (212) is fixed to the rib (232).

5. The stator assembly according to claim 4, characterized in that, The two adjacent ribs (232) together with the inner ring (2312) and the outer ring (2311) form the hollow hole (215), and the two adjacent hollow holes (215) are connected through the through hole (2326) to form the second space (233).

6. A dual-rotor motor, characterized in that, It includes an outer rotor assembly (1), an inner rotor assembly (3), and a stator assembly (2) as described in any one of claims 1-5; The outer rotor assembly (1) is coaxially rotatably disposed on the outside of the stator assembly (2); The inner rotor assembly (3) is coaxially rotatably disposed inside the stator assembly (2).

7. The dual-rotor motor according to claim 6, characterized in that, It also includes a housing and axle (7) that are mounted relative to each other. The outer rotor assembly (1) and the inner rotor assembly (3) are fixedly connected to the housing; The stator assembly (2) is fixedly connected to the axle (7).

8. The dual-rotor motor according to claim 7, characterized in that, The outer rotor assembly (1) includes a plurality of outer rotor magnets (12), and the inner rotor assembly (3) includes a plurality of inner rotor magnets (32). The center points of the outer rotor magnet (12) and the inner rotor magnet (32), which are in the same phase, are on the same radial line (25).

9. A hub motor, characterized in that, Includes the dual-rotor motor as described in any one of claims 6-8; The housing of the dual-rotor motor includes a first end cover (5), a second end cover (6), and a rim (8) that are coaxially fixed. The outer rotor assembly (1) and the inner rotor assembly (3) of the dual-rotor motor are fixedly connected to the first end cover (5) and / or the second end cover (6), respectively.

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