Wheel hub motor and vehicle

Abstract

The embodiment of the application provides a kind of wheel hub motor and vehicle, it is related to vehicle technical field.The wheel hub motor includes motor stator, eddy current detection component and motor rotor.Eddy current detection component is connected with motor stator.Motor rotor includes rotor body and the detected piece connected with rotor body, and rotor body can rotate relative to motor stator.Eddy current detection component and the detected piece are spaced apart in the axial direction of rotor body, and eddy current detection component is configured to, when motor rotor rotates and drives the detected piece to rotate, the electric eddy current effect change generated in the rotation process of the detected piece is sensed.The wheel hub motor of the embodiment of the application, the space occupied by the detected piece in the wheel hub motor is smaller, so that the space utilization of wheel hub motor is higher.

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] In-wheel motor technology integrates power, transmission, and braking systems into the wheel hub, which is of great significance for simplifying the structure, utilizing space, and transforming the drive system of new energy vehicles. The control system of an in-wheel motor requires real-time and accurate acquisition of the motor's rotational speed information.

[0003] The related technology provides a hub motor in which the stator of a rotary transformer is fixed on the motor stator, and the rotor of the rotary transformer is fixed on the motor rotor, with the stator and rotor of the rotary transformer being coaxially arranged. When the motor rotor rotates, it drives the rotor of the rotary transformer to rotate synchronously, causing the magnetic field coupling relationship between the stator and rotor of the rotary transformer to change periodically. By calculating this change, the rotational speed information of the motor rotor can be obtained.

[0004] However, the rotor of the rotary transformer occupies a large space inside the hub motor, resulting in low space utilization of the hub motor. Utility Model Content

[0005] This application provides a hub motor and a vehicle. The space occupied by the tested component inside the hub motor is small, which makes the space utilization rate of the hub motor high.

[0006] In a first aspect, embodiments of this application provide a hub motor, including a motor stator, an eddy current detection component, and a motor rotor. The eddy current detection component is connected to the motor stator. The motor rotor includes a rotor body and a detection element connected to the rotor body, the rotor body being rotatable relative to the motor stator. The eddy current detection component and the detection element are spaced apart in the axial direction of the rotor body. The eddy current detection component is configured to sense changes in the eddy current effect generated by the detection element during rotation when the motor rotor rotates and drives the detection element to rotate.

[0007] In some possible implementations, the component being tested includes multiple protrusions connected sequentially along the circumferential direction of the rotor body, with a groove formed between two adjacent protrusions.

[0008] In some possible implementations, the protrusion includes a connecting section and a raised section. Adjacent connecting sections are connected. The raised section is connected to the connecting section, and at least one of the raised section and the connecting section is connected to the rotor body. The raised section protrudes from the inside out relative to the connecting section along the radial direction of the rotor body.

[0009] In some possible implementations, the protrusion is arc-shaped.

[0010] In some possible implementations, the rotor body is integrally formed with the part being tested.

[0011] In some possible implementations, the object under test has a first end face facing the eddy current detection assembly, and the eddy current detection assembly has a second end face facing the object under test, with the first end face parallel to the second end face.

[0012] In some possible implementations, the orthographic projection of the tested component onto the eddy current detection assembly is located inside the eddy current detection assembly along the axial direction of the rotor body.

[0013] In some possible implementations, the component being tested is connected to the side of the rotor body facing the eddy current detection assembly.

[0014] In some possible implementations, the eddy current detection assembly includes a housing, a circuit board, a transmitting coil, and a receiving coil. The circuit board is housed within the housing. The transmitting coil is housed within the housing and connected to the circuit board. The receiving coil is housed within the housing and connected to the circuit board.

[0015] Secondly, embodiments of this application provide a vehicle, including a vehicle body and any of the hub motors provided in the first aspect connected to the vehicle body.

[0016] The hub motor and vehicle provided in this application embodiment have an eddy current detection component connected to the motor stator. By being spaced apart from the tested component on the motor rotor in the axial direction, the component utilizes the eddy current effect to sense the change in eddy current effect generated during rotation, thereby obtaining speed information.

[0017] Since the tested component does not need to have a built-in winding structure like the rotor of a rotary transformer, it only needs to be a simple conductor structure to generate the eddy current effect. Therefore, the volume of the tested component can be reduced, and the space occupied inside the hub motor can be reduced, thereby improving the space utilization rate inside the hub motor.

[0018] In addition, by eliminating the complex structures such as windings and iron cores in the rotary transformer rotor, the number of parts can be reduced, thereby lowering manufacturing costs and assembly difficulty. Attached Figure Description

[0019] 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.

[0020] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of this application;

[0021] Figure 2This is a schematic diagram of a hub motor provided in an embodiment of this application;

[0022] Figure 3 A cross-sectional schematic diagram of a hub motor provided in an embodiment of this application;

[0023] Figure 4 for Figure 3 Enlarged view of point A in the image;

[0024] Figure 5 Another structural schematic diagram of the hub motor provided in the embodiments of this application;

[0025] Figure 6 This is another structural schematic diagram of the hub motor provided in the embodiments of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 10. Vehicle body; 11. Suspension system; 12. Tires; 20. Wheel hub motors;

[0028] 100. Motor stator;

[0029] 200, Eddy current detection component; 210, Second end face; 220, Housing; 230, Weight reduction hole;

[0030] 300, Motor rotor; 310, Rotor body; 320, Component under test; 321, Protrusion; 321a, Connecting section; 321b, Protruding section; 322, Groove; 323, First end face;

[0031] 400. Shaft.

[0032] To facilitate understanding of the embodiments of this application, the spline curves and arrows used in the reference numerals in the accompanying drawings are explained below: the components indicated by spline curves without arrows can be solid components, that is, components with solid structures; the components indicated by spline curves with arrows can be virtual components, that is, components without solid structures; in some cases, the components indicated by spline curves with arrows can also be assemblies with solid structures or virtual structures.

[0033] 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

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0035] 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. In the description of the embodiments of this application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships (if present), are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of this application 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 on the embodiments of this application. 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. Unless otherwise specified, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Where there is no conflict, embodiments of this application and the various features thereof can be combined with each other, all of which are within the scope of protection of this application.

[0036] Figure 1 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application.

[0037] like Figure 1 As shown, this application embodiment provides a vehicle, including a vehicle body 10 and a hub motor 20 connected to the vehicle body 10.

[0038] The vehicle body 10 can support the hub motor 20, which in turn provides driving force to the vehicle body 10. Furthermore, the hub motor 20 eliminates traditional transmission components such as drive shafts and differentials, thus simplifying the structure of the vehicle body 10's power system, achieving integrated power system layout, reducing mechanical transmission losses, and improving energy transfer efficiency.

[0039] It should be noted that the embodiments of this application do not limit the type of vehicle. For example, in terms of purpose, the vehicle can be a passenger car, such as a sedan, sport utility vehicle (SUV), multi-purpose vehicle (MPV), sports car, pickup truck, or bus, or a commercial vehicle, such as a truck or special vehicle (e.g., fire truck, ambulance). In terms of power type, the vehicle can be a gasoline-powered vehicle, an electric vehicle (e.g., pure electric vehicle, plug-in hybrid electric vehicle, hybrid electric vehicle, or range-extended electric vehicle), or a fuel cell vehicle.

[0040] In some embodiments, such as Figure 1 As shown, the vehicle body 10 may include a suspension system 11, which is connected to the hub motor 20.

[0041] In some embodiments, such as Figure 1 As shown, the vehicle body 10 includes a rim and a tire 12. The rim is fitted around the hub motor 20, and the tire 12 is fitted onto the rim. The hub motor 20 can support the rim, and the rim can support the tire 12.

[0042] In some embodiments, the vehicle may be configured with two or four hub motors 20 to achieve different drive modes such as front-wheel drive, rear-wheel drive, or four-wheel drive.

[0043] In some embodiments, the vehicle body 10 may further include a battery system that is electrically connected to the hub motor 20 to provide power to the hub motor 20.

[0044] In some embodiments, the vehicle body 10 may further include a control system, which is communicatively connected to the hub motors 20 and is used to control the operating state of the hub motors 20. The control system can adjust the output torque of each hub motor 20 in real time according to the driver's operating instructions or the vehicle's driving state.

[0045] Currently, in-wheel motor technology integrates power, transmission, and braking systems into the wheel hub, which is of great significance for simplifying the structure, utilizing space, and transforming the drive system of new energy vehicles. In the control system of an in-wheel motor, it is necessary to obtain the motor's speed information in real time and with high precision.

[0046] The related technology provides a hub motor in which the stator of a rotary transformer is fixed on the motor stator, and the rotor of the rotary transformer is fixed on the motor rotor, with the stator and rotor of the rotary transformer being coaxially arranged. When the motor rotor rotates, it drives the rotor of the rotary transformer to rotate synchronously, causing the magnetic field coupling relationship between the stator and rotor of the rotary transformer to change periodically. By calculating this change, the rotational speed information of the motor rotor can be obtained.

[0047] However, the rotor of a rotary transformer needs to be equipped with rotor windings, which typically include an iron core and coils wound on the iron core. This causes the rotor of the rotary transformer to occupy a large space in both the radial and axial directions, resulting in low space utilization of the hub motor.

[0048] Figure 2 This is a schematic diagram of a hub motor 20 provided in an embodiment of this application. Figure 3 This is a cross-sectional schematic diagram of the hub motor 20 provided in an embodiment of this application. Figure 4 for Figure 3 Enlarged view of point A in the image.

[0049] In view of this, such as Figures 2 to 4 As shown, this application embodiment provides a hub motor 20, including a motor stator 100, an eddy current detection component 200, and a motor rotor 300. The eddy current detection component 200 is connected to the motor stator 100. Figure 4 As shown, the motor rotor 300 includes a rotor body 310 and a test element 320 connected to the rotor body 310. The rotor body 310 is rotatable relative to the motor stator 100. The eddy current detection component 200 and the test element 320 are spaced apart in the axial direction of the rotor body 310. The eddy current detection component 200 is configured to sense changes in the eddy current effect generated in the test element 320 during rotation when the motor rotor 300 rotates and drives the test element 320 to rotate.

[0050] The hub motor 20 provided in this application adopts an eddy current detection component 200 instead of a traditional rotary transformer to obtain the rotational speed information of the motor rotor 300, thereby simplifying the structure and improving space utilization.

[0051] Specifically, the eddy current detection component 200 is connected to the motor stator 100. By being spaced apart from the detected component 320 on the motor rotor 300 in the axial direction, the component 200 uses the eddy current effect to sense the changes in the eddy current effect generated by the detected component 320 during rotation, thereby obtaining speed information.

[0052] Since the tested component 320 does not need to have a built-in winding structure like the rotor of a rotary transformer, it only needs to be a simple conductor structure to generate the eddy current effect. Therefore, the volume of the tested component 320 can be reduced, and the space occupied inside the hub motor 20 is reduced, thereby improving the space utilization rate inside the hub motor 20.

[0053] Meanwhile, the arrangement of the eddy current detection component 200 and the tested component 320 in the axial direction of the rotor body 310 allows the hub motor 20 to make full use of the axial space on the side of the motor rotor 300 to arrange the eddy current detection component 200 and the tested component 320, avoiding additional space occupation in the radial direction, thereby further optimizing the overall spatial layout of the hub motor 20.

[0054] In addition, by eliminating the complex structures such as windings and iron cores in the rotary transformer rotor, the number of parts can be reduced, thereby lowering manufacturing costs and assembly difficulty.

[0055] In some embodiments, the eddy current detection component 200 can be fixed to the motor stator 100 by means of bolting, snapping, bonding or welding.

[0056] In some embodiments, the tested component 320 may be a conductive component such as a copper component, an aluminum component, or an iron component.

[0057] In some embodiments, such as Figure 2 As shown, the hub motor 20 also includes a rotating shaft 400, wherein the motor stator 100 is fixedly connected to the rotating shaft 400, and the motor rotor 300 is rotatably connected to the rotating shaft 400.

[0058] Among them, the rotating shaft 400, as the central bearing component of the hub motor 20, provides a reliable support foundation for the motor stator 100, thereby ensuring that the motor stator 100 can maintain a stable position during operation.

[0059] The motor rotor 300 and the rotating shaft 400 are rotatably connected, which allows the motor rotor 300 to rotate freely around the rotating shaft 400. This enables relative motion between the motor rotor 300 and the motor stator 100, and then generates driving torque through electromagnetic induction.

[0060] Therefore, this structural configuration enables the hub motor 20 to efficiently convert electrical energy into mechanical energy and directly drive the wheel rotation. This eliminates the need for intermediate transmission components such as differentials and drive shafts in traditional power transmission systems, thereby simplifying the power transmission structure of the vehicle, reducing energy loss during the energy transmission process, and improving the overall transmission efficiency of the vehicle.

[0061] In some embodiments, the rotating shaft 400 and the motor stator 100 can be fixedly connected by various methods such as bolt connection, welding or interference fit.

[0062] In some embodiments, the motor rotor 300 and the shaft 400 can be rotatably connected by bearings, such as deep groove ball bearings, angular contact ball bearings, or tapered roller bearings.

[0063] In some embodiments, the pivot 400 and the suspension system 11 can be fixedly connected by various methods such as bolt connection and welding.

[0064] In some embodiments, the hub motor 20 may further include a braking device connected to the shaft 400. The braking device is used to brake the motor rotor 300 to achieve the vehicle's braking function, thereby integrating the drive and braking functions within the hub motor 20 and further improving the system's integration. For example, the braking device may be brake shoes, etc.

[0065] In some embodiments, the hub motor 20 may further include a motor controller, which may be connected to the shaft 400. The motor controller may be used to send control signals to the stator windings in the motor stator 100, thereby driving the motor rotor 300 to rotate.

[0066] In some embodiments, the rotating shaft 400 may be provided with a cooling channel, through which a cooling medium flows to remove the heat generated by the components of the hub motor 20 during operation, thereby effectively improving the heat dissipation performance of the hub motor 20 and enhancing its operational reliability and service life.

[0067] Figure 5 This is a schematic diagram of another structure of the hub motor 20 provided in an embodiment of this application.

[0068] In some possible implementations, such as Figure 5 As shown, the tested component 320 includes a plurality of protrusions 321 connected sequentially along the circumferential direction of the rotor body 310, and a groove 322 is formed between two adjacent protrusions 321.

[0069] When the motor rotor 300 drives the tested object 320 to rotate, the protrusion 321 and the groove 322 alternately pass through the sensing area of ​​the eddy current detection component 200. Due to the difference in axial height between the protrusion 321 and the groove 322, the protrusion 321 is closer to the eddy current detection component 200, while the groove 322 is farther away. This periodic change in distance causes the magnetic field coupling strength between the eddy current detection component 200 and the tested object 320 to exhibit periodic changes.

[0070] Specifically, when the protrusion 321 passes the eddy current detection component 200, the eddy current effect generated on the surface of the detected part 320 is strong due to the close distance, resulting in a larger voltage amplitude induced in the receiving coil of the eddy current detection component 200. Conversely, when the groove 322 passes the eddy current detection component 200, the eddy current effect is weaker due to the greater distance, resulting in a smaller voltage amplitude induced in the receiving coil. This periodic voltage amplitude variation forms a regular sine or cosine signal. By processing this signal, the rotational speed and angle information of the motor rotor 300 can be obtained. Therefore, the alternating structure of the protrusion 321 and the groove 322 can effectively modulate a high-quality periodic signal, thereby achieving high-precision detection of the rotational speed of the motor rotor 300.

[0071] In some embodiments, the number of protrusions 321 is two or more, such as three, four, eight, sixteen, etc. The more protrusions 321 there are, the more cycles of the periodic signal generated during one revolution of the motor rotor 300, thereby improving the angular resolution and speed detection accuracy.

[0072] In some possible implementations, such as Figure 5 As shown, the protrusion 321 includes a connecting section 321a and a protruding section 321b. Adjacent connecting sections 321a are connected. The protruding section 321b is connected to the connecting section 321a, and at least one of the protruding section 321b and the connecting section 321a is connected to the rotor body 310. The protruding section 321b protrudes from the inside out relative to the connecting section 321a along the radial direction of the rotor body 310.

[0073] Specifically, the connecting section 321a connects the adjacent protruding sections 321b into an integral structure, ensuring that the tested part 320 has sufficient mechanical strength, avoiding the risk of the protruding section 321b deforming or falling off due to centrifugal force during high-speed rotation, and improving the operating stability and service life of the hub motor 20.

[0074] At the same time, the connecting function of the connecting section 321a makes the manufacturing process of the tested part 320 simpler. It can be integrally formed by stamping, casting or machining, which reduces the manufacturing difficulty and production cost.

[0075] In some possible implementations, the protrusion 321b is arc-shaped.

[0076] Specifically, when the motor rotor 300 rotates, the relative position between the protruding section 321b and the eddy current detection component 200 changes. Since the protruding section 321b is arc-shaped with continuous and smooth surface curvature, the air gap distance between the detected component 320 and the eddy current detection component 200 exhibits a continuous and gradual change when the protruding section 321b passes through the sensing area of ​​the eddy current detection component 200. Consequently, the change in the intensity of the eddy current effect also exhibits a continuous and smooth transition characteristic. This smooth transition makes the voltage signal waveform induced by the receiving coil more regular, with more ideal sine or cosine characteristics, reducing higher harmonic components in the signal. Therefore, the subsequent angle calculation process can be based on higher quality sine / cosine signals, thereby improving the detection accuracy of motor speed and rotor position. Furthermore, the regular signal waveform reduces the filtering requirements of the signal processing circuit, simplifying the complexity of the circuit design.

[0077] It is understandable that when the protrusion 321b is arc-shaped, since the tested part 320 includes multiple protrusions 321, the outer contour of the tested part 320 can appear as a petal shape.

[0078] Of course, in addition to being arc-shaped, the protruding segment 321b can also be in a trapezoidal or parabolic shape or an irregular shape in some other embodiments.

[0079] In some possible implementations, the rotor body 310 and the tested component 320 are integrally formed.

[0080] By adopting an integral molding method, the part to be tested 320 is formed directly during the manufacturing process of the rotor body 310, eliminating the need to manufacture the part to be tested 320 separately and then assemble and connect it. This simplifies the manufacturing process and reduces the number of processing steps and assembly steps.

[0081] Meanwhile, since there is no connection interface between the integrally formed test piece 320 and the rotor body 310, no additional parts are needed to connect the two, thereby reducing the number of parts and further reducing material and processing costs.

[0082] Furthermore, the one-piece molding eliminates the assembly gap between the tested part 320 and the rotor body 310, ensuring the coaxiality and relative positional accuracy between the two.

[0083] Of course, in addition to being integrally formed with the rotor body 310, in some other embodiments, the test component 320 and the rotor body 310 can also be connected by means of bolts, rivets, welding or bonding.

[0084] In some embodiments, the tested component 320 can be integrally formed with the rotor body 310 by casting, stamping, or other methods.

[0085] Figure 6 This is another structural schematic diagram of the hub motor 20 provided in the embodiments of this application.

[0086] In some possible implementations, such as Figure 4 and Figure 5 As shown, the tested component 320 has a first end face 323 facing the eddy current detection assembly 200, as... Figure 4 and Figure 6 As shown, the eddy current detection assembly 200 has a second end face 210 facing the object under test 320, and a first end face 323 is parallel to the second end face 210.

[0087] By setting the first end face 323 and the second end face 210 to be parallel, the air gap between the tested component 320 and the eddy current detection assembly 200 remains constant throughout the detection area, thereby ensuring that the alternating magnetic field generated by the eddy current detection assembly 200 can penetrate the surface of the tested component 320 with uniform intensity. When the motor rotor 300 drives the tested component 320 to rotate, the eddy current intensity distribution induced on the surface of the tested component 320 is more uniform due to the uniform air gap. As a result, the eddy current effect change signal sensed by the eddy current detection assembly 200 has a higher signal-to-noise ratio and lower waveform distortion, making the calculated rotational speed information more accurate and reliable, thereby improving the accuracy of the hub motor 20 rotational speed detection.

[0088] In some possible implementations, the orthographic projection of the detected element 320 onto the eddy current detection assembly 200 is located inside the eddy current detection assembly 200 along the axial direction of the rotor body 310.

[0089] When the motor rotor 300 rotates, the tested component 320 rotates accordingly. The eddy current detection component 200 emits an alternating magnetic field to the tested component 320. Under the action of the alternating magnetic field, the tested component 320 generates an eddy current effect, and the eddy current detection component 200 senses the change in magnetic field caused by the eddy current effect.

[0090] Since the orthographic projection of the tested component 320 onto the eddy current detection component 200 is entirely within the eddy current detection component 200, this means that the entire modulation region of the tested component 320 is within the effective sensing range of the eddy current detection component 200. The alternating magnetic field generated by the transmitting coil of the eddy current detection component 200 can completely cover all effective areas of the tested component 320, and the eddy current effect generated by the tested component 320 can be fully sensed by the receiving coil, thereby maximizing the amplitude of the induced signal output by the receiving coil.

[0091] Meanwhile, since the tested component 320 does not exceed the boundary of the eddy current detection component 200, the edge effect between the edge of the tested component 320 and the edge of the eddy current detection component 200 is avoided from interfering with the sensing signal. The edge effect usually leads to uneven magnetic field distribution, which in turn introduces noise signal. However, by confining the orthographic projection of the tested component 320 inside the eddy current detection component 200, the signal distortion caused by this edge effect can be effectively eliminated.

[0092] Furthermore, this arrangement increases the proportion of effective signal components and reduces the proportion of noise components in the signal received by the eddy current detection component 200, thereby improving the signal-to-noise ratio. This allows the subsequent signal processing circuit to more accurately calculate the rotational speed information of the motor rotor 300, thus improving detection sensitivity and measurement accuracy.

[0093] In some possible implementations, such as Figure 4 As shown, the tested component 320 is connected to the side of the rotor body 310 facing the eddy current detection assembly 200.

[0094] With this axial end face arrangement, the component to be tested 320 is directly set on the end face of the rotor body 310 facing the eddy current detection component 200. There is no need to open up special installation space on the radial periphery or inside of the rotor body 310, thereby avoiding additional occupation of the radial dimension of the rotor body 310. This can maximize the radial compactness of the rotor body 310, and effectively control the overall radial dimension of the hub motor 20, which is conducive to the miniaturization of the hub motor 20.

[0095] Meanwhile, the axial end face arrangement makes full use of the extended space of the rotor body 310 in the axial direction, transforming the originally potentially idle end face area into a functional detection area, thus achieving efficient reuse of space.

[0096] In some embodiments, the detected element 320 may be disposed in the central region or the outer edge region of the end face of the rotor body 310 facing the eddy current detection assembly 200.

[0097] In some possible implementations, such as Figure 4 As shown, the eddy current detection assembly 200 includes a housing 220, a circuit board, a transmitting coil, and a receiving coil. The circuit board is housed within the housing 220. The transmitting coil is housed within the housing 220 and connected to the circuit board. The receiving coil is housed within the housing 220 and connected to the circuit board.

[0098] Specifically, the circuit board can integrate functional modules such as signal processing circuits, drive circuits, and communication interfaces, so that functions such as generating excitation signals for the transmitting coil, acquiring induction signals for the receiving coil, and subsequent signal processing and angle calculation can all be completed on the circuit board. This avoids complex external wiring and discrete component layout, reduces the propagation path of electromagnetic interference, and improves the anti-interference capability of the signal.

[0099] The housing 220 provides physical protection for the circuit board, transmitting coil and receiving coil, effectively preventing damage to the internal electronic components from vibrations and impacts generated during the operation of the hub motor 20, as well as dust and moisture in the external environment.

[0100] Furthermore, the housing 220 can also be made of a material with electromagnetic shielding function, which further improves the measurement stability and reliability of the eddy current detection component 200 by shielding against interference from external electromagnetic fields.

[0101] Since the transmitting coil and receiving coil are directly fixed on the circuit board and encapsulated in the housing 220, the entire eddy current detection assembly 200 forms a compact and fully functional modular unit, which facilitates installation and debugging as a whole during the assembly of the hub motor 20, reduces assembly difficulty and assembly errors, and improves production efficiency.

[0102] This modular and integrated design minimizes the size of the eddy current detection component 200, taking up less space inside the hub motor 20, thereby further improving the space utilization of the hub motor 20, while also reducing manufacturing costs and maintenance difficulty.

[0103] In some embodiments, the shape of the outer shell 220 can be a regular shape such as a fan or a circle, or it can be an irregular shape.

[0104] In some embodiments, the circuit board may be a printed circuit board or a flexible circuit board.

[0105] In some embodiments, the housing 220 may be made of aluminum, aluminum alloy, or stainless steel, etc.

[0106] In some embodiments, the housing 220 may be provided with a sealing structure, such as a sealing ring or sealant at the mating surface of the housing 220, to achieve dustproof and waterproof functions and improve the reliability of the eddy current detection component 200 in harsh environments.

[0107] In some embodiments, a damping material, such as a silicone pad or foam material, may be provided between the circuit board and the housing 220 to absorb the vibration generated during the operation of the hub motor 20, protect the circuit board and coil from vibration damage, and extend the service life of the eddy current detection assembly 200.

[0108] In some embodiments, such as Figure 4 As shown, the housing 220 may have weight reduction holes 230 to achieve weight reduction and cost reduction of the hub motor 20.

[0109] It should be understood that the embodiments of this application are not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can 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: Motor stator; An eddy current detection component, wherein the eddy current detection component is connected to the motor stator; An electric motor rotor, the electric motor rotor including a rotor body and a test piece connected to the rotor body, the rotor body being rotatable relative to the motor stator; The eddy current detection component and the tested component are spaced apart in the axial direction of the rotor body. The eddy current detection component is configured to sense the change in eddy current effect generated by the tested component during rotation when the motor rotor rotates and drives the tested component to rotate.

2. The hub motor according to claim 1, characterized in that, The tested component includes a plurality of protrusions connected sequentially along the circumferential direction of the rotor body, and a groove is formed between two adjacent protrusions.

3. The hub motor according to claim 2, characterized in that, The protrusion includes: A connecting segment, wherein two adjacent connecting segments are connected; A raised section is connected to the connecting section, and at least one of the raised section and the connecting section is connected to the rotor body. The raised section is arranged to protrude from the inside to the outside relative to the connecting section along the radial direction of the rotor body.

4. The hub motor according to claim 3, characterized in that, The protruding section is arc-shaped.

5. The hub motor according to any one of claims 1-4, characterized in that, The rotor body is integrally formed with the tested component.

6. The hub motor according to any one of claims 1-4, characterized in that, The object under test has a first end face facing the eddy current detection assembly, and the eddy current detection assembly has a second end face facing the object under test, wherein the first end face is parallel to the second end face.

7. The hub motor according to any one of claims 1-4, characterized in that, Along the axial direction of the rotor body, the orthographic projection of the tested component on the eddy current detection assembly is located inside the eddy current detection assembly.

8. The hub motor according to any one of claims 1-4, characterized in that, The component under test is connected to the side of the rotor body facing the eddy current detection assembly.

9. The hub motor according to any one of claims 1-4, characterized in that, The eddy current detection component includes: shell; A circuit board, wherein the circuit board is disposed within the housing; A transmitting coil is disposed inside the housing and connected to the circuit board; A receiving coil is disposed inside the housing and is connected to the circuit board.

10. A vehicle, characterized in that, It includes a vehicle body and a hub motor as described in any one of claims 1-9 connected to the vehicle body.

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