Vehicle, electric wheel thereof and radial birotor yoke-free motor

Abstract

The utility model discloses a vehicle, an electric wheel of the vehicle and a radial double-rotor yoke-free motor, the radial double-rotor yoke-free motor comprises a rotor and a stator, the rotor comprises an annular rotor shell, an open mounting groove is formed in one axial end of the rotor shell, a plurality of permanent magnets are arranged on the inner wall and the outer wall of the mounting groove respectively, and the permanent magnets are arranged in the mounting groove. The stator comprises an end cover installed at the opening end of the installation groove and a plurality of stator supports arranged in the installation groove through the end cover, and a winding is arranged between every two adjacent stator supports. The radial double-rotor yoke-free motor is compact in structure, the permanent magnets are arranged on the inner wall and the outer wall of the rotor shell, a double-face magnetic field interacting with the stator at the same time is formed, a magnetic circuit is shortened, and the power density and the torque density are improved.

Description

Technical Field

[0001] This application relates to the field of electric motor technology, and in particular to a vehicle and its electric wheels, and a radial dual-rotor yokeless motor. Background Technology

[0002] With the development of new energy technologies and the increasing popularity of new energy electric vehicles, OEMs and component suppliers worldwide have been investing in the field of automotive in-wheel motors in recent years. This demonstrates that in-wheel motors represent the future development direction of the new energy vehicle industry. In-wheel motors are typically installed inside the vehicle's wheel hub. Currently, most in-wheel motors on the market are stators with a single rotor. However, existing single-rotor motors have limited achievable speeds. Therefore, increasing the output torque / power requires higher material strength, leading to higher costs in terms of processes, materials, and manufacturing. Thus, improvements are needed. Utility Model Content

[0003] The purpose of this utility model is to provide a vehicle and its electric wheel, and a radial dual-rotor yokeless motor, to overcome the shortcomings of the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] This application discloses a radial dual-rotor yokeless motor, including a rotor and a stator. The rotor includes an annular rotor housing, and an open mounting groove is provided at one axial end of the rotor housing. A plurality of permanent magnets are respectively provided on the inner and outer walls of the mounting groove. The stator includes an end cover rotatably mounted on the open end of the mounting groove and a plurality of stator supports disposed in the mounting groove through the end cover. Windings are provided between adjacent stator supports.

[0006] Furthermore, in the aforementioned radial dual-rotor yokeless motor, the end cover near the rotor housing has an annular first boss protruding from one end, and the first boss and the inner and outer walls of the mounting groove are respectively rotated by a first bearing.

[0007] Furthermore, in the aforementioned radial dual-rotor yokeless motor, the first boss has a plurality of recessed slots at one end near the stator support, and one end of the stator support is inserted into the corresponding slot.

[0008] Furthermore, in the aforementioned radial dual-rotor yokeless motor, the stator support includes mutually perpendicular support bases and support bodies, with the support bases embedded in the slots.

[0009] Furthermore, in the aforementioned radial dual-rotor yokeless motor, the winding includes an iron core and a coil wound on the iron core. Pole shoes are respectively provided at both ends of the iron core near the permanent magnet, and limiting grooves corresponding to the pole shoes are respectively provided on both sides of the radial ends of the support body.

[0010] Furthermore, in the aforementioned radial dual-rotor yokeless motor, sealing rings are respectively provided between the first boss and the inner and outer walls of the mounting groove, and the sealing rings are provided between the end cover and the corresponding first bearing.

[0011] This application also discloses an electric wheel, including a tire, a hub, and the aforementioned radial dual-rotor yokeless motor. The rotor housing of the radial dual-rotor yokeless motor is connected to the hub via a flexible torque transmission mechanism. The flexible torque transmission mechanism includes an intermediate disk connected to the rotor housing and a brake disc connected to the intermediate disk.

[0012] Furthermore, in the aforementioned electric wheel, the end cap of the radial dual-rotor yokeless motor is an annular structure, and the two sides of its inner wall respectively have second protrusions extending towards the side close to the flexible torque transmission mechanism. The brake disc has a connecting shaft protruding from the center of one end close to the radial dual-rotor yokeless motor. The connecting shaft is slidably connected to the two second protrusions through a central block, and the connecting shaft is rotatably connected to the central block through a second bearing.

[0013] Furthermore, the electric wheel described above also includes a steering knuckle and a brake caliper. The steering knuckle is fixed to one end of the center block away from the flexible torque transmission mechanism. A connecting bracket for mounting the brake caliper is provided on one side of the steering knuckle. The brake disc is connected to a brake disc corresponding to the brake caliper.

[0014] This application also discloses a vehicle including the aforementioned electric wheel, the end cap of which is connected to the vehicle frame.

[0015] Compared with the prior art, the advantages of this utility model are: the radial dual rotor yokeless motor has a compact structure, the inner ring permanent magnet and the outer ring permanent magnet respectively form a double magnetic field acting on the iron core, the magnetic circuit is shortened, the magnetic field area is increased, and the power and torque density are increased. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 The diagram shown is a schematic representation of a radial dual-rotor yokeless motor in a specific embodiment of this utility model.

[0018] Figure 2 The figure shown is a cross-sectional schematic diagram of a radial dual-rotor yokeless motor in a specific embodiment of this utility model.

[0019] Figure 3 The diagram shown is a schematic representation of the installation of the stator support and windings in a specific embodiment of this utility model.

[0020] Figure 4 The diagram shown is a structural schematic of the electric wheel in a specific embodiment of this utility model.

[0021] Figure 5 The diagram shown is a cross-sectional view of the electric wheel in a specific embodiment of this utility model.

[0022] Figure 6 The diagram shown is a structural schematic of the electric wheel in a specific embodiment of this utility model, omitting the tire and hub.

[0023] Figure 7 The diagram shown is a connection diagram of a radial dual-rotor yokeless motor and a flexible torque transmission mechanism in a specific embodiment of this utility model.

[0024] Figure 8 As shown Figure 7 A schematic diagram of its breakdown. Detailed Implementation

[0025] The technical solutions of the present utility model will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0028] As shown Figures 1 to 3 in the figure, a radial double-rotor yokeless motor includes a rotor and a stator. The rotor includes an annular rotor housing 1. One end of the rotor housing 1 in the axial direction is provided with an open installation groove. A plurality of permanent magnets 2 are provided on the inner wall and the outer wall of the installation groove respectively. The stator includes an end cover 3 rotatably installed at the open end of the installation groove and a plurality of stator brackets 4 arranged in the installation groove through the end cover 3. Windings 5 are arranged between adjacent stator brackets 4.

[0029] In this technical solution, the stator brackets are circumferentially arrayed at equal intervals on the end face of the end cover close to the rotor. Plug-in slots for winding installation are formed between adjacent stator brackets. The stator brackets are fixed on the axial side of the motor, so that a larger space can be reserved in the middle of the motor. After the motor is integrally assembled on the electric wheel and the vehicle, the distance for the central block to move up and down becomes larger. An annular open slot is recessed in the end face of the rotor housing close to the end cover as an installation groove for accommodating the permanent magnets, the stator brackets and the windings. The permanent magnets include inner-ring permanent magnets and outer-ring permanent magnets, and both are composed of a plurality of permanent magnets and are respectively fitted on the inner ring (the side wall close to its axis) and the outer wall (the side wall far from its bearing) of the installation groove. The inner-ring permanent magnets and the outer-ring permanent magnets respectively form inner and outer double-sided magnetic fields acting on the windings, the magnetic path is shortened, the magnetic field area is increased, and the power and torque density are increased.

[0030] Exemplarily, referring to Figures 1 to 3 the figure, a ring-shaped first boss protrudes from one end of the end cover 3 close to the rotor housing 1, and the first boss rotates with the inner wall and the outer wall of the installation groove through first bearings 6 respectively.

[0031] In this technical solution, the first boss and the end cover are integrally formed to improve the connection strength and the overall structural strength. The first bearings are of a conventional bearing structure, enabling the rotor housing to rotate relative to the end cover, that is, the end cover does not rotate, which can prevent foreign objects from stirring and winding outside; a conventional cooling cavity is also provided in the end cover and the first boss, and coolant is filled in the cooling cavity and is connected to an external cooling system through joints and pipes to take away the heat of the motor.

[0032] Exemplarily, referring to Figure 3 the figure, a plurality of slots are recessed in one end of the first boss close to the stator bracket 4, and one end of the stator bracket 4 is inserted into the corresponding slots.

[0033] In this technical solution, several slots are arranged radially along the first boss and arranged in a circumferential array at equal intervals for mounting the stator support.

[0034] For example, see Figure 3 As shown, the stator support 4 includes a support base and a support body that are perpendicular to each other, with the support base embedded in a slot.

[0035] In this technical solution, the stator support is a T-shaped structure, including mutually perpendicular support bases and support bodies. The support base is embedded in the slot of the first boss and fixed by bolts, etc., and a space for accommodating the winding is formed between adjacent support bodies.

[0036] For example, see Figure 3 As shown, the winding 5 includes an iron core 51 and a coil 52 wound on the iron core 51. The iron core 51 is provided with pole shoes 511 at both ends near the permanent magnet 2. The two sides of the radial ends of the support body are respectively provided with limiting grooves corresponding to the pole shoes 511.

[0037] In this technical solution, the pole shoes at both ends of the iron core are the inner ring pole shoe and the outer ring pole shoe, respectively. After the winding is installed between the stator supports, the inner ring pole shoe and the outer ring pole shoe are located in the same circumferential plane and are respectively set with the inner ring permanent magnet and the outer ring permanent magnet. The inner ring permanent magnet and the outer ring permanent magnet respectively form a double magnetic field acting on the iron core, shortening the magnetic circuit, increasing the magnetic field area, and increasing the power and torque density. The two ends of the inner ring pole shoe and the outer ring pole shoe are respectively slidably embedded into the limiting grooves at both ends of their adjacent mounting plates, which facilitates the installation of the iron core and improves the stability of the iron core installation.

[0038] For example, see Figure 2 As shown, sealing rings 7 are respectively provided between the inner wall and the outer wall of the first boss and the mounting groove, and the sealing rings 7 are provided between the end cover 3 and the corresponding first bearing 6.

[0039] In this technical solution, the sealing ring is a conventional boneless sealing ring, which improves the sealing between the end cover and the rotor housing and prevents water from seeping into the rotor housing during water immersion.

[0040] For example, see Figures 4 to 8 As shown, an electric wheel includes a tire 8, a hub 9, and the aforementioned radial dual-rotor yokeless motor. The rotor housing 1 of the radial dual-rotor yokeless motor is connected to the hub via a flexible torque transmission mechanism 10. The flexible torque transmission mechanism 10 includes an intermediate disk 101 connected to the rotor housing 1 and a brake disk 102 connected to the intermediate disk.

[0041] For example, see Figures 4 to 8As shown, the end cover 3 of the radial dual rotor yokeless motor has an annular structure, and the two sides of its inner wall have second protrusions extending towards the side close to the flexible torque transmission mechanism 10. The brake disc 102 has a connecting shaft protruding from the center of one end close to the radial dual rotor yokeless motor. The connecting shaft is slidably connected to the two second protrusions through the center block 20, and the two ends of the connecting shaft are rotatably connected to the center block 20 through the second bearing 30.

[0042] For example, see Figures 4 to 8 As shown, it also includes a steering knuckle 30 and a brake caliper 40. The steering knuckle 30 is fixed to one end of the center block 20 away from the flexible torque transmission mechanism 10. A connecting bracket for mounting the brake caliper 40 is provided on one side of the steering knuckle 30. The brake disc 102 is connected to a brake disc corresponding to the brake caliper 40.

[0043] In this technical solution, the flexible torque transmission mechanism directly utilizes the structure described in existing technology. Three first axle pins are protruding from the side of the rotor housing near the wheel hub, and three second axle pins are respectively provided on the side of the brake disc near the intermediate disc. The first and second axle pins are rotatably connected to a connecting rod, and the end of the connecting rod opposite to the corresponding first and second axle pins is rotatably connected to the intermediate disc via a third axle pin. The first, second, and third axle pins are evenly spaced within a circumference of the same diameter. The connecting rod is a block structure with two through holes, which are rotatably fitted onto the third axle pin and either the first or second axle pin. When the wheel hub vibrates, i.e., when the brake drum shakes up and down, the intermediate disc can radially offset relative to the brake drum. The radial dual-rotor yokeless motor can also radially offset relative to the intermediate disc. Combined with the limiting of the steering knuckle and the center block, this achieves radial displacement of the wheel hub relative to the radial dual rotor. The rotor of the yokeless motor is radially offset vertically to avoid rigid forces exerted by the wheel hub on the central disc and the radial dual-rotor yokeless motor. This also reduces the impact of vibrations such as bumps on the radial dual-rotor yokeless motor, improving its operating environment and extending its service life. During steering, the steering knuckle acts on both the wheel hub and the radial dual-rotor yokeless motor, enhancing stability. The specific connection structures and principles of the tires, wheel hubs, steering knuckles, brake calipers, and brake discs are all existing technologies and will not be detailed here. The stator bracket is fixed to the axial side of the motor via end caps, allowing for more space in the motor's center and increasing the vertical movement distance of the center block, improving its ability to withstand bumps. The end caps do not rotate, preventing external objects from churning or becoming entangled. Furthermore, the motor's torque and torque density are increased, improving vehicle starting speed and climbing ability.

[0044] For example, see Figures 4 to 8 As shown, a vehicle includes the aforementioned electric wheel, the end cap 3 of which is connected to the frame via an up-pulling shock absorber 50.

[0045] In this technical solution, the pull-up shock absorber can directly utilize the structure described in the existing technology, including a spring bracket (not shown) and a tension rod elastically connected between the spring bracket and the end cover. The spring bracket includes a mounting plate and a slotted block that are fixed to each other. The mounting plate is fixed to the vehicle frame by bolts or welding, or the slotted block can be directly set on the vehicle frame. The top of the tension rod is a cylindrical structure that slides through the slotted block, and springs are sleeved at both ends inside and outside the slotted block. The springs are limited by conventional structures such as nuts. When the tension rod moves up or down, it is elastically connected to the spring bracket to reduce the impact of vibration on the dual-rotor yokeless motor. The bottom end of the tension rod is connected to the side of the end cover by pins, etc., transferring the entire weight of the dual-rotor yokeless motor upward to the vehicle frame. The end cover is fixed to the axial side of the dual-rotor yokeless motor, shortening the length of the tension rod and improving its strength and lifespan.

[0046] In summary, the stator bracket is fixed to the axial side of the motor, allowing for a larger space in the middle of the motor. After the motor is assembled into the electric wheel and the vehicle, the distance between the vertical movement of the center block increases. The double-layered permanent magnets form double-sided magnetic fields acting on the windings, shortening the magnetic circuit, increasing the magnetic field area, and increasing the power and torque density, thereby improving the vehicle's starting speed and climbing ability.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0048] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A radial dual-rotor yokeless motor, characterized in that, The device includes a rotor and a stator. The rotor includes an annular rotor housing with an open mounting groove at one axial end. The inner and outer walls of the mounting groove are respectively provided with a plurality of permanent magnets. The stator includes an end cap rotatably mounted on the open end of the mounting groove and a plurality of stator supports disposed in the mounting groove through the end cap. Windings are provided between adjacent stator supports.

2. The radial dual-rotor yokeless motor according to claim 1, characterized in that: The end cap near the rotor housing has an annular first boss protruding from one end, and the first boss and the inner and outer walls of the mounting groove are respectively rotated by a first bearing.

3. The radial dual-rotor yokeless motor according to claim 2, characterized in that: The first boss has a plurality of recessed slots at one end near the stator support, and one end of the stator support is inserted into the corresponding slot.

4. The radial dual-rotor yokeless motor according to claim 3, characterized in that: The stator support includes a support base and a support body that are perpendicular to each other, and the support base is embedded in the slot.

5. The radial dual-rotor yokeless motor according to claim 4, characterized in that: The winding includes an iron core and a coil wound on the iron core. The iron core is provided with pole shoes at both ends near the permanent magnet. The bracket body is provided with limiting grooves corresponding to the pole shoes on both sides of its radial ends.

6. The radial dual-rotor yokeless motor according to claim 2, characterized in that: A sealing ring is provided between the first boss and the inner and outer walls of the mounting groove, respectively, and the sealing ring is provided between the end cover and the corresponding first bearing.

7. An electric wheel, characterized in that: The invention includes a tire, a wheel hub, and a radial dual-rotor yokeless motor as described in any one of claims 1 to 6, wherein the rotor housing of the radial dual-rotor yokeless motor is connected to the wheel hub via a flexible torque transmission mechanism, the flexible torque transmission mechanism including an intermediate disk connected to the rotor housing and a brake disc connected to the intermediate disk.

8. The electric wheel according to claim 7, characterized in that: The end cover of the radial dual rotor yokeless motor is an annular structure, and the two sides of its inner wall have second protrusions extending towards the side close to the flexible torque transmission mechanism. The brake disc has a connecting shaft protruding from the center of one end close to the radial dual rotor yokeless motor. The connecting shaft is slidably connected to the two second protrusions through a central block, and the connecting shaft is rotatably connected to the central block through a second bearing.

9. The electric wheel according to claim 8, characterized in that: It also includes a steering knuckle and a brake caliper. The steering knuckle is fixed to one end of the center block away from the flexible torque transmission mechanism. A connecting bracket for mounting the brake caliper is provided on one side of the steering knuckle. The brake disc is connected to a brake disc corresponding to the brake caliper.

10. A vehicle, characterized in that, Includes the electric wheel as described in any one of claims 7 to 9, wherein the end cap of the electric wheel is connected to the frame.

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