Hub motor and stator structure thereof

Abstract

The utility model discloses a wheel hub motor and a stator structure thereof, the wheel hub motor stator structure comprises a stator holder and a stator iron core which are coaxially arranged, a heat dissipation flow channel is arranged in the stator holder, the stator iron core comprises a stator main body, a plurality of pole teeth and a winding, the pole teeth extend outwards from the stator main body in the radial direction, and the winding is wound on the pole teeth. Heat conduction pads are arranged on the end faces of the two axial sides of the stator iron core respectively, cooling fins are arranged on the side faces, away from the stator iron core, of the heat conduction pads, and the cooling fins are connected to the stator holder. The hub motor is simple in structure, heat dissipation of the hub motor can be accelerated, and the use performance of the hub motor is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of automobile hub motors, and in particular to a hub motor and a stator structure thereof. Background Art

[0002] The wheel hub motor technology is also known as the in-wheel motor technology. Its biggest feature is that the power device, transmission device and brake device are all integrated into the wheel hub, which greatly simplifies the mechanical part of the electric vehicle. The internal heat transfer process to the environment is mainly conduction and convection, while radiation only works on the external surface. The heat dissipation is poor, the temperature rise is large during operation, and electromagnetic thermal stress will be generated at high speed or high load. Motor overheating will have a great impact on motor performance. Therefore, improvements are needed. Utility Model Content

[0003] The utility model aims to provide a hub motor stator structure, which can accelerate the heat dissipation inside the motor to overcome the shortcomings of the prior art.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] An embodiment of the present application discloses a hub motor stator structure, comprising a coaxially arranged stator holder and a stator core, wherein a heat dissipation channel is arranged in the stator holder, and the stator core comprises a stator body, a plurality of pole teeth extending radially outward from the stator body, and windings wound around the pole teeth, and thermal pads are respectively arranged on both axial side end surfaces of the stator core, and a heat sink is arranged on the side of the thermal pad facing away from the stator core, and the heat sink is connected to the stator holder.

[0006] Furthermore, in the above-mentioned hub motor stator structure, a side surface of the stator retainer is provided with a liquid inlet and a liquid outlet respectively connected to the heat dissipation channel.

[0007] Furthermore, in the above-mentioned hub motor stator structure, the thermal conductive pad is a ring-shaped structure made of flexible silicone and is attached to the corresponding end surface of the winding.

[0008] Furthermore, in the above-mentioned hub motor stator structure, an annular first groove is concavely provided in the end surface of the thermal conductive pad close to the pole teeth, and is wrapped around the surface of the winding protruding from the pole teeth.

[0009] Furthermore, in the above-mentioned hub motor stator structure, the heat sink is a ring-shaped structure made of metal and is attached to the corresponding end surface of the thermal pad.

[0010] Furthermore, in the above-mentioned hub motor stator structure, a second annular groove is concavely provided on the side surface of the heat sink close to the thermal pad and wrapped around the surface of the thermal pad.

[0011] Furthermore, in the above-mentioned hub motor stator structure, the heat sink and the corresponding end faces of the pole teeth are arranged at intervals.

[0012] Furthermore, in the above-mentioned hub motor stator structure, an annular locking ring protrudes from the inner ring of the heat sink, and the locking ring is sleeved on the stator retainer and fits against the corresponding side surface of the stator body.

[0013] Furthermore, in the above-mentioned hub motor stator structure, the locking ring and the heat sink are integrally formed.

[0014] The embodiment of the present application also discloses a hub motor, comprising the above-mentioned hub motor stator structure.

[0015] Compared with the prior art, the advantages of the utility model are: the stator of the hub motor has a simple structure, a built-in heat dissipation channel, and the stator holder is cooled by an external circulating cooling system. At the same time, a soft thermal conductive pad is wrapped around the end of the winding to transfer the heat of the winding to the heat sink. The heat sink fixed to the stator holder transfers the heat to the stator holder and is cooled by the medium in the heat dissipation channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 Shown is a structural schematic diagram of a hub motor stator structure in a specific embodiment of the utility model.

[0018] Figure 2 Shown is an exploded schematic diagram of the stator structure of a hub motor in a specific embodiment of the utility model.

[0019] Figure 3 Shown is a cross-sectional schematic diagram of a hub motor stator structure in a specific embodiment of the utility model.

[0020] Figure 4 Shown is a schematic diagram of the installation of a thermal pad and a heat sink in a specific embodiment of the utility model.

[0021] Figure 5 Shown is a schematic structural diagram of a stator retainer in a specific embodiment of the utility model. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to describe the technical solutions in the embodiments of the utility model in detail. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Ginseng Figures 1 to 5 As shown, a hub motor stator structure comprises a coaxially arranged stator holder 1 and a stator core 2, a heat dissipation channel 11 is arranged in the stator holder 1, the stator core 2 comprises a stator body, a plurality of pole teeth extending radially outward from the stator body and a winding wound around the pole teeth, thermal pads 3 are arranged on both axial end faces of the stator core 2, a heat sink 4 is arranged on the side of the thermal pad 3 away from the stator core 2, and the heat sink 4 is connected to the stator holder 1. Figure 1 One side of the heat sink is omitted.

[0026] In this technical solution, the outer contour of the stator holder is an existing structure, which is determined by the actual working conditions of the conventional hub motor. It is formed by conventional processes such as casting or die-casting, and a heat dissipation channel is formed inside it. The cooling medium flows along the heat dissipation channel and cools the stator holder. The thermal pad is tightly attached to the end of the winding and transfers the heat of the winding to the heat sink. The heat sink fixed to the stator holder transfers the heat to the stator holder and is cooled by the medium in the heat dissipation channel.

[0027] For example, see Figure 1 and Figure 5 As shown, a liquid inlet 12 and a liquid outlet 13 which are respectively connected to the heat dissipation channel 11 are provided on the side of the stator retainer 1.

[0028] In this technical solution, the positions of the liquid inlet and the liquid outlet are interchangeable, and conventional pipe joints are provided respectively by means of threaded connection or the like, so as to facilitate quick connection with the circulating cooling system.

[0029] For example, see Figures 1 to 4 As shown, the thermal pad 3 is a ring-shaped structure made of flexible silicone and is attached to the corresponding end surface of the winding.

[0030] In this technical solution, the thermal pad is made of elastic insulating silicone and other materials, and has good thermal conductivity. It is squeezed and deformed by the heat sink and squeezed into the gap between the copper wires of the winding. It has high fixing strength with the winding and is in full contact with the winding, which is conducive to conducting the heat generated by the winding.

[0031] For example, see Figures 1 to 4 As shown, a first annular groove is formed in the end surface of the thermal pad 3 close to the pole teeth, and is wrapped around the surface of the winding protruding from the pole teeth.

[0032] In this technical solution, the thermal pad completely wraps the winding end protruding from the pole teeth, increasing the contact area between the winding and the thermal pad, which is beneficial to conduct the heat generated by the winding.

[0033] For example, Figures 1 to 4 As shown, the heat sink 4 is a ring-shaped structure made of metal and is attached to the corresponding end surface of the thermal pad 3 .

[0034] In this technical solution, the heat sink is made of aluminum alloy with good thermal conductivity, etc., and is used to conduct the heat of the heat sink pad. The aluminum alloy has a low density, which is beneficial to reducing the weight of the hub motor.

[0035] For example, see Figures 1 to 4 As shown, a second annular groove is formed inwardly on the side of the heat sink 4 close to the thermal pad 3 and wrapped around the surface of the thermal pad 3 .

[0036] In this technical solution, the heat sink is made in the shape of the thermal pad to increase the contact area with the thermal pad, which is beneficial to conduct the heat absorbed by the thermal pad.

[0037] For example, see Figures 1 to 4 As shown, the heat sink 4 and the corresponding end faces of the pole teeth are arranged at intervals.

[0038] In this technical solution, the heat sink does not protrude radially beyond the circumferential surface of the pole teeth to avoid interference with the rotor, and at the same time, the heat sink and the corresponding end faces of the pole teeth are spaced apart to avoid magnetic conduction between the stator core and the rotor.

[0039] For example, see Figures 1 to 4 As shown, an annular locking ring protrudes from the inner circle of the heat sink 4, and the locking ring is sleeved on the stator retainer 1 and fits against the corresponding side surface of the stator body.

[0040] In this technical solution, the locking ring is fixed to the outer wall of the stator holder by means of interference fit or the like, and is in full contact with the stator holder, which is beneficial to heat conduction between the heat sink and the stator holder.

[0041] For example, see Figures 1 to 4 As shown, the locking ring and the heat sink 4 are formed integrally.

[0042] In this technical solution, the locking ring and the heat sink are integrally formed by conventional processes such as die casting, thereby ensuring the connection strength between the locking ring and the heat sink, and transferring the heat of the heat sink to the stator retaining frame through the locking ring.

[0043] Exemplarily, by applying the above-mentioned hub motor stator structure to a hub motor, a hub motor with fast heat dissipation can be formed.

[0044] To summarize, the hub motor has a simple stator structure and a built-in heat dissipation channel. The stator holder is cooled by an external circulating cooling system. At the same time, a soft thermal pad is wrapped around the end of the winding to transfer the heat of the winding to the heat sink. The heat sink fixed to the stator holder transfers the heat to the stator holder and is cooled by the medium in the heat dissipation channel.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0046] The above is only a specific implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A hub motor stator structure, characterized in that: It comprises a coaxially arranged stator holder and a stator core, wherein a heat dissipation channel is arranged in the stator holder, and the stator core comprises a stator body, a plurality of pole teeth extending radially outward from the stator body, and a winding wound around the pole teeth, and thermal pads are respectively arranged on both axial end faces of the stator core, and a heat sink is arranged on the side of the thermal pad away from the stator core, and the heat sink is connected to the stator holder.

2. The hub motor stator structure according to claim 1, characterized in that: The side surface of the stator retainer is provided with a liquid inlet and a liquid outlet which are respectively communicated with the heat dissipation flow channel.

3. The hub motor stator structure according to claim 1, characterized in that: The thermal pad is a ring-shaped structure made of flexible silica gel and is attached to the corresponding end surface of the winding.

4. The hub motor stator structure according to claim 3, characterized in that: The end surface of the thermal conductive pad close to the pole teeth is concavely provided with an annular first groove, and is wrapped around the surface of the winding protruding from the pole teeth.

5. The hub motor stator structure according to claim 1, characterized in that: The heat sink is a ring-shaped structure made of metal and is attached to the corresponding end surface of the thermal pad.

6. The hub motor stator structure according to claim 5, characterized in that: A second annular groove is concavely provided on the side surface of the heat sink close to the thermal pad and wrapped around the surface of the thermal pad.

7. The hub motor stator structure according to claim 6, characterized in that: The heat sink and the corresponding end faces of the pole teeth are arranged at intervals.

8. The hub motor stator structure according to claim 6, characterized in that: An annular locking ring protrudes from the inner circle of the heat sink, and the locking ring is sleeved on the stator retainer and fits against the corresponding side surface of the stator body.

9. The hub motor stator structure according to claim 8, characterized in that: The locking ring and the heat sink are formed in one piece.

10. A hub motor, characterized in that: The invention comprises the hub motor stator structure as described in any one of claims 1 to 9.

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