Wheel hub motor and vehicle

Abstract

The embodiment of the application provides a kind of wheel hub motor and vehicle.It relates to vehicle technical field.Wheel hub motor includes stator assembly and rotor assembly.Stator assembly includes stator support, stator core, multiple first windings and multiple second windings, stator core is connected with stator support, and first winding and second winding are respectively wound in the opposite sides of stator core.First rotor and second rotor are respectively arranged in the opposite two side walls of installation slot, and stator core is inserted in installation slot, and rotor support is rotated relative to stator core, so that first winding is directly opposite first rotor, and second winding is directly opposite second rotor.To reach the effect of improving the output power of wheel hub motor.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more particularly to a hub motor and a vehicle. Background Technology

[0002] With the rapid development of new energy vehicles, hub motors, as an efficient and compact drive solution, are being increasingly used in vehicle drive systems.

[0003] In related technologies, hub motors include a stator and a rotor. The stator is fixedly mounted on the vehicle's suspension system or steering knuckle, and its internal windings generate a rotating magnetic field when energized. The rotor is directly connected to the wheel rim and rotates under the influence of the rotating magnetic field generated by the stator, thereby driving the wheel to rotate synchronously and achieving direct drive of the wheel.

[0004] However, due to the limited installation space inside the wheel hub, the number of winding turns and core size of a single stator cannot be increased significantly, resulting in relatively low output power, which is difficult to meet the drive requirements under high torque or high speed conditions. Utility Model Content

[0005] This application provides a hub motor and a vehicle to improve the output power of the hub motor.

[0006] In a first aspect, embodiments of this application provide a hub motor, including:

[0007] A stator assembly, comprising a stator support, a stator core, a plurality of first windings and a plurality of second windings, wherein the stator core is connected to the stator support, and the first windings and the second windings are respectively wound on opposite sides of the stator core;

[0008] The rotor assembly includes a rotor support, a first rotor, and a second rotor. The rotor support is provided with a mounting groove. The first rotor and the second rotor are respectively disposed on opposite side walls of the mounting groove. The stator core is inserted into the mounting groove. The rotor support rotates relative to the stator core so that the first winding faces the first rotor and the second winding faces the second rotor.

[0009] In one possible implementation, the stator core includes an annular portion, a plurality of first connecting portions and a plurality of second connecting portions. The first connecting portions are evenly distributed circumferentially on the outer sidewall of the annular portion, and there is a gap between two adjacent first connecting portions. The first winding is wound on the first connecting portion.

[0010] The second connecting parts are evenly distributed circumferentially on the inner sidewall of the annular part, and there is a gap between two adjacent second connecting parts. The second winding is wound on the second connecting parts accordingly.

[0011] In one possible implementation, the stator assembly further includes a molding compound that covers the stator core, the first winding, and the second winding, and is connected to the stator support.

[0012] In one possible implementation, the stator support is provided with a plurality of fixing rods, which are respectively inserted into the gaps between two adjacent first connecting parts and / or between two adjacent second connecting parts, and are connected to the plastic sealing layer.

[0013] In one possible implementation, the rotor support includes a housing and a mounting ring disposed within the housing, the housing and the mounting ring forming a mounting groove.

[0014] In one possible implementation, the first rotor includes a plurality of permanent magnets circumferentially disposed on the inner sidewall of the housing facing the mounting ring.

[0015] In one possible implementation, the second rotor includes a rotor ring, two end rings, and a plurality of guide bars. The rotor ring is disposed on the side wall of the mounting ring facing the housing. The rotor ring has a plurality of through holes in its circumference. The guide bars are inserted into the through holes. The end rings are respectively disposed at both ends of the rotor ring and are respectively connected to the guide bars.

[0016] In one possible implementation, a placement groove is provided on the inner sidewall of the housing, and the permanent magnet is disposed in the placement groove.

[0017] In one possible implementation, the guide bar and the end ring are cast aluminum or cast copper parts.

[0018] Secondly, embodiments of this application provide a vehicle including a hub motor.

[0019] This application provides a hub motor and vehicle. The hub motor has mounting slots on a rotor support, with a first rotor and a second rotor respectively positioned on opposite sides of the mounting slots. A stator core connected to a stator support is inserted into the mounting slots, and a first winding and a second winding are respectively positioned on both sides of the stator core, corresponding to the first and second rotors. This achieves a dual-rotor symmetrical structure, forming two parallel electromagnetic drive units. The first winding and its corresponding first rotor, and the second winding and its corresponding second rotor, respectively constitute independent magnetic circuits and armature systems, achieving superimposed electromagnetic power output under the same outer diameter and axial spatial constraints. This improves the copper loss utilization efficiency and magnetic energy density per unit volume, enhances the total output torque and power capability of the motor, while maintaining the advantages of direct drive and compact structure of hub motors. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0021] Figure 1 This is a structural schematic diagram of the hub motor provided in this application;

[0022] Figure 2 A cross-sectional view of the hub motor provided in this application;

[0023] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0024] Figure 4 for Figure 1 A schematic diagram of the connection structure of the middle stator core, the first winding, and the second winding;

[0025] Figure 5 for Figure 1 Schematic diagram of the middle stator core;

[0026] Figure 6 for Figure 1 Schematic diagram of the middle fixed rod;

[0027] Figure 7 for Figure 1 A cross-sectional view of the second rotor.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100. Stator assembly; 110. Stator bracket; 120. Stator core; 121. Annular part; 122. First connecting part; 123. Second connecting part; 130. First winding; 140. Second winding; 150. Plastic sealant; 160. Fixing rod; 200. Rotor assembly; 210. Rotor bracket; 211. Housing; 212. Mounting ring; 220. First rotor; 230. Second rotor; 231. Rotor ring; 232. End ring; 233. Guide bar; 234. Through hole; 240. Mounting slot.

[0030] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0031] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0032] In related technologies, hub motors typically consist of a stator and a rotor. The stator is fixedly mounted on the vehicle's suspension system or steering knuckle, and its internal windings generate a rotating magnetic field when energized. The rotor is directly connected to the wheel rim and rotates under the influence of this rotating magnetic field, thereby driving the wheel to rotate synchronously and achieving direct wheel drive. However, due to the limited internal space of the hub, the core size and number of winding turns of a single stator cannot be significantly increased, resulting in limited electromagnetic load and power density, and relatively low output power, making it difficult to meet the drive requirements under harsh conditions such as high torque or high speed.

[0033] This application provides a hub motor and a vehicle. The hub motor has mounting slots on a rotor support, with a first rotor and a second rotor respectively mounted on opposite sides of the mounting slots. A stator core connected to a stator support is inserted into the mounting slots, and a first winding and a second winding are respectively mounted on both sides of the stator core, corresponding to the first and second rotors. This achieves a dual-rotor symmetrical structure, forming two parallel electromagnetic drive units. The first winding and its corresponding first rotor, and the second winding and its corresponding second rotor, respectively constitute independent magnetic circuits and armature systems, achieving superimposed electromagnetic power output under the same outer diameter and axial spatial constraints. This improves the copper loss utilization efficiency and magnetic energy density per unit volume, enhances the total output torque and power capability of the motor, while maintaining the advantages of direct drive and compact structure of hub motors.

[0034] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0035] This application provides a hub motor, referring to... Figure 1 , Figure 2 and Figure 3 The hub motor includes a stator assembly 100 and a rotor assembly 200.

[0036] The stator assembly 100 includes a stator support 110, a stator core 120, a plurality of first windings 130 and a plurality of second windings 140. The stator core 120 is connected to the stator support 110, and the first windings 130 and the second windings 140 are respectively wound on opposite sides of the stator core 120.

[0037] The rotor assembly 200 includes a rotor support 210, a first rotor 220, and a second rotor 230. The rotor support 210 is provided with a mounting groove 240. The first rotor 220 and the second rotor 230 are respectively disposed on opposite side walls of the mounting groove 240. The stator core 120 is inserted into the mounting groove 240. The rotor support 210 rotates relative to the stator core 120 so that the first winding 130 is directly opposite the first rotor 220 and the second winding 140 is directly opposite the second rotor 230.

[0038] By arranging independent first windings 130 and second windings 140 on both axial sides of the stator core 120, and correspondingly configuring first rotors 220 and second rotors 230 on the side walls of the mounting slot 240 of the rotor support 210, two parallel electromagnetic drive units are formed. The first winding 130 and its corresponding first rotor 220, and the second winding 140 and its corresponding second rotor 230, respectively constitute independent magnetic circuits and armature systems, achieving superimposed electromagnetic power output under the same outer diameter and axial spatial constraints. This improves the copper loss utilization efficiency and magnetic energy density per unit volume, enhances the total output torque and power capability of the motor, while maintaining the advantages of direct drive and compact structure of hub motors.

[0039] In the embodiments of this application, the hub motor adopts an external rotor structure. That is, the rotor assembly 200 is disposed outside the stator assembly 100.

[0040] In one possible implementation, refer to Figure 3 , Figure 4 and Figure 5The stator core 120 includes an annular portion 121, a plurality of first connecting portions 122, and a plurality of second connecting portions 123. The first connecting portions 122 are evenly distributed circumferentially on the outer sidewall of the annular portion 121, with a gap between adjacent first connecting portions 122. A first winding 130 is wound on the first connecting portions 122. The second connecting portions 123 are evenly distributed circumferentially on the inner sidewall of the annular portion 121, with a gap between adjacent second connecting portions 123. A second winding 140 is wound on the second connecting portions 123.

[0041] The annular portion 121 is a circular ring, and one end of the annular portion 121 is fixedly connected to the stator support 110.

[0042] For example, the first connecting portion 122, the second connecting portion 123, and the annular portion 121 are all integrally formed.

[0043] For example, the length of the first connecting portion 122 is arranged along the axial direction of the annular portion 121. A plurality of first connecting portions 122 are evenly distributed along the circumference of the annular portion 121 on the outer side wall of the annular portion 121, so that a plurality of first windings 130 are wound one-to-one on the first connecting portion 122, and the first windings 130 are wound along the length direction of the first connecting portion 122.

[0044] For example, the length of the second connecting portion 123 is arranged along the axial direction of the annular portion 121. A plurality of second connecting portions 123 are evenly distributed along the circumference of the annular portion 121 on the inner sidewall of the annular portion 121, so that a plurality of second windings 140 are wound one-to-one on the second connecting portion 123, and the second windings 140 are wound along the length direction of the second connecting portion 123.

[0045] The first connecting portion 122 and the second connecting portion 123 are located on both sides of the annular portion 121, so as to separate the first connecting portion 122 and the second connecting portion 123 and prevent the first winding 130 and the second winding 140 from being connected.

[0046] It achieves efficient utilization of the 120mm space in the stator core, constructs an inner and outer double winding structure on the same ring, forming two independent but conjugate electromagnetic units. This not only improves the winding arrangement density but also enhances the magnetic flux utilization rate, providing a physical basis for dual-channel drive or redundant control, and significantly improving the motor power density.

[0047] In one possible implementation, refer to Figure 3 , Figure 4 and Figure 5 The stator assembly 100 also includes a molding compound 150, which covers the stator core 120, the first winding 130 and the second winding 140, and is connected to the stator support 110.

[0048] The molding compound 150 is made of high-performance engineering plastic through injection molding. The molding compound 150 also serves to securely connect the stator support 110 and the stator core 120.

[0049] The molding compound 150 encapsulates the core components of the stator, effectively improving insulation performance, moisture and dust resistance, and mechanical strength, while suppressing vibration and noise in the first winding 130 and the second winding 140. Furthermore, the combination of the molding compound and the stator support 110 enhances the overall structural rigidity, which is beneficial for maintaining the stability and reliability of the stator assembly 100 under high speeds or complex road conditions.

[0050] In one possible implementation, refer to Figure 3 and Figure 6 The stator support 110 is provided with a plurality of fixing rods 160, which are respectively inserted into the gaps between two adjacent first connecting parts 122 and / or between two adjacent second connecting parts 123, and are connected to the plastic sealing layer 150.

[0051] For example, the fixing rod 160 is fixed to one side of the stator bracket 110, and the fixing rod 160 and the stator bracket 110 are welded or integrally formed. The fixing rod 160 is inserted into the gap between the first connecting parts 122 and / or between two adjacent second connecting parts 123, and the fixing rod 160 is isolated from the first winding 130 and the second winding 140 to avoid the fixing rod 160 affecting the first winding 130 or the second winding 140.

[0052] In some examples, the retaining rod 160 can be inserted into the gap between the first connecting parts 122.

[0053] In some other examples, the retaining rod 160 can also be inserted into the gap between the second connecting parts 123.

[0054] In the example of this application, the fixing rod 160 is respectively inserted into the gap between two adjacent first connecting parts 122 and between two adjacent second connecting parts 123, and connected to the plastic sealing layer 150, thereby fixing the stator core 120 to the stator bracket 110.

[0055] The fixing rod 160 is embedded in the stator core 120 and forms a mechanical interlock with the plastic seal 150, which enhances the connection strength and torsional resistance between the stator core 120 and the bracket, prevents core displacement or plastic seal cracking caused by electromagnetic force or thermal expansion during motor operation, and improves structural durability and assembly accuracy.

[0056] In one possible implementation, refer to Figure 2 and Figure 3The rotor support 210 includes a housing 211 and a mounting ring 212. The mounting ring 212 is disposed inside the housing 211, and the housing 211 and the mounting ring 212 surround each other to form a mounting groove 240.

[0057] The mounting ring 212 is integrally formed with the housing 211. The mounting groove 240 is a U-shaped groove, and the stator core 120, the first winding 130 and the second winding 140 are inserted into the mounting groove 240 through the open end of the mounting groove 240.

[0058] The mounting ring 212 provides a compact, coaxial, and highly rigid mounting platform for the first rotor 220 and the second rotor 230, ensuring that the first rotor 220 and the second rotor 230 maintain precise relative position and air gap uniformity during rotation. It also facilitates assembly, improves overall dynamic balance performance, and reduces the risk of vibration and eccentricity during high-speed operation.

[0059] In one possible implementation, the first rotor 220 includes a plurality of permanent magnets circumferentially disposed on the inner sidewall of the housing 211 facing the mounting ring 212.

[0060] For example, a placement groove is also provided on the inner sidewall of the housing 211, and the permanent magnet is placed in the placement groove. The permanent magnet is fixed to the inner sidewall of the housing 211 by adhesive bonding.

[0061] In the embodiments of this application, the permanent magnets are N45SH. The permanent magnets are arranged in a Halbach array.

[0062] In one possible implementation, refer to Figure 3 and Figure 7 The second rotor 230 includes a rotor ring 231, two end rings 232 and multiple guide bars 233. The rotor ring 231 is disposed on the side wall of the mounting ring 212 facing the housing 211. Multiple through holes 234 are provided in the circumference of the rotor ring 231. The guide bars 233 are inserted into the through holes 234 respectively. The end rings 232 are respectively disposed at both ends of the rotor ring 231 and are respectively connected to the guide bars 233.

[0063] The rotor ring 231 is the rotor core. In the embodiments of this application, the rotor core is a ring.

[0064] The rotor ring 231, guide bar 233, and end ring 232 of the second rotor 230 constitute a typical squirrel-cage induction rotor, which, together with the inner second winding 140, forms an asynchronous drive unit. When only the second winding 140 is energized, since the rotor has no permanent magnets, it will not generate drag torque (parasitic braking effect) caused by the permanent magnet magnetic field in the unexcited state, thereby reducing energy loss under no-load or coasting conditions and improving system efficiency. Combined with the first rotor 220, which uses permanent magnets, a hybrid rotor architecture is formed. It can output high power in synergy between the two windings under high load, and the first rotor 220 can operate independently with a single winding under light load or coasting conditions to avoid drag losses, thus balancing high efficiency, reliability, and adaptability to multiple operating conditions.

[0065] In one possible implementation, the cross-section of the through hole 234 in the radial direction of the rotor ring 231 can be teardrop-shaped, trapezoidal, elliptical, etc., and the through hole can also be a parallel tooth groove, parallel groove, convex groove, knife-shaped groove, closed groove, double-cage rotor groove, trapezoidal groove, etc.

[0066] The guide bar 233 is adapted to the through hole 234. The cross-section of the guide bar 233 in the radial direction of the rotor ring 231 is also teardrop-shaped.

[0067] The teardrop-shaped through-hole 234 optimizes the magnetic circuit distribution around the conductor bar 233, effectively weakening tooth harmonics and cogging torque, and reducing torque pulsation and electromagnetic noise. At the same time, it improves the current distribution within the conductor bar 233, reduces the additional losses caused by the skin effect, and improves the efficiency of the second rotor 230 under high-frequency or variable-speed operation.

[0068] For example, guide bar 233 and end ring 232 are cast aluminum. In other examples, guide bar 233 and end ring 232 can be cast copper.

[0069] This application provides a vehicle including a hub motor. The stator bracket 110 of the hub motor is fixed to the vehicle's suspension system or steering knuckle and does not rotate with the wheel. The rotor bracket 210 of the hub motor is connected to the wheel rim or wheel and rotates synchronously with the wheel.

[0070] The vehicle provided in this application embodiment features a hub motor with a mounting slot 240 on the rotor bracket 210. A first rotor 220 and a second rotor 230 are respectively mounted on opposite sides of the mounting slot 240. A stator core 120 connected to the stator bracket 110 is inserted into the mounting slot 240. A first winding 130 and a second winding 140 are respectively mounted on both sides of the stator core 120, corresponding to the first rotor 220 and the second rotor 230. This achieves a dual-rotor symmetrical structure, forming two parallel electromagnetic drive units. The first winding 130 and its corresponding first rotor 220, and the second winding 140 and its corresponding second rotor 230, respectively constitute independent magnetic circuits and armature systems, achieving superimposed electromagnetic power output under the same outer diameter and axial spatial constraints. This improves the copper loss utilization efficiency and magnetic energy density per unit volume, enhances the total output torque and power capability of the motor, while maintaining the advantages of direct drive and compact structure of the hub motor.

[0071] Finally, it should be noted that other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and alterations may be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A hub motor, characterized in that, include: A stator assembly (100) includes a stator support (110), a stator core (120), a plurality of first windings (130) and a plurality of second windings (140), wherein the stator core (120) is connected to the stator support (110), and the first windings (130) and the second windings (140) are respectively wound on opposite sides of the stator core (120); The rotor assembly (200) includes a rotor support (210), a first rotor (220), and a second rotor (230). The rotor support (210) is provided with a mounting groove (240). The first rotor (220) and the second rotor (230) are respectively disposed on opposite side walls of the mounting groove (240). The stator core (120) is inserted into the mounting groove (240). The rotor support (210) rotates relative to the stator core (120) so that the first winding (130) faces the first rotor (220) and the second winding (140) faces the second rotor (230).

2. The hub motor according to claim 1, characterized in that, The stator core (120) includes an annular portion (121), a plurality of first connecting portions (122) and a plurality of second connecting portions (123). The first connecting portions (122) are evenly distributed around the outer sidewall of the annular portion (121), and there is a gap between two adjacent first connecting portions (122). The first winding (130) is wound on the first connecting portions (122). The second connecting part (123) is evenly distributed circumferentially on the inner sidewall of the annular part (121), and there is a gap between two adjacent second connecting parts (123). The second winding (140) is wound on the second connecting part (123) respectively.

3. The hub motor according to claim 2, characterized in that, The stator assembly (100) further includes a molding compound (150) that covers the stator core (120), the first winding (130) and the second winding (140) and is connected to the stator support (110).

4. The hub motor according to claim 3, characterized in that, The stator bracket (110) is provided with a plurality of fixing rods (160), which are respectively inserted into the gaps between two adjacent first connecting parts (122) and / or between two adjacent second connecting parts (123) and connected to the plastic sealing layer (150).

5. The hub motor according to any one of claims 1-4, characterized in that, The rotor support (210) includes a housing (211) and a mounting ring (212), the mounting ring (212) being disposed inside the housing (211), and the housing (211) and the mounting ring (212) forming a mounting groove (240).

6. The hub motor according to claim 5, characterized in that, The first rotor (220) includes a plurality of permanent magnets, which are circumferentially disposed on the inner sidewall of the housing (211) facing the mounting ring (212).

7. The hub motor according to claim 5, characterized in that, The second rotor (230) includes a rotor ring (231), two end rings (232) and multiple guide bars (233). The rotor ring (231) is disposed on the side wall of the mounting ring (212) facing the housing (211). The rotor ring (231) is provided with multiple through holes (234) in the circumferential direction. The guide bars (233) are inserted into the through holes (234) respectively. The end rings (232) are respectively disposed at both ends of the rotor ring (231) and are respectively connected to the guide bars (233).

8. The hub motor according to claim 6, characterized in that, The inner wall of the housing (211) is also provided with a placement groove, and the permanent magnet is placed in the placement groove.

9. The hub motor according to claim 7, characterized in that, The guide bar (233) and the end ring (232) are made of cast aluminum or cast copper.

10. A vehicle, characterized in that, Including the hub motor as described in any one of claims 1-9.

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