Sensor, wheel hub motor and vehicle

Abstract

This application discloses a sensor, a hub motor, and a vehicle. The sensor is applied to the hub motor and includes: a sensing element adapted to connect to the stator of the hub motor; and a follower element disposed opposite to the sensing element, adapted to connect to the mover of the hub motor. The follower element includes an annular mounting platform and sensing teeth. The sensing teeth are disposed on the annular mounting platform, which can reduce the space occupied by the follower element inside the hub motor, thereby achieving lightweighting and miniaturization of the hub motor. It can also increase and ensure the number of sensing teeth, and the number of sensing teeth is positively correlated with the detection accuracy of the sensor. Therefore, while meeting the lightweight requirements of the vehicle, the detection accuracy of the sensor is further improved, thus improving the safety of the vehicle.

Description

Technical Field

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

[0002] Currently, sensors are typically installed inside the wheel hub motor to measure the vehicle's wheel speed, etc. The sensors usually use the impeller as the sensing target, and the purpose of measuring the vehicle's wheel speed can be achieved by sensing the blades of the impeller.

[0003] However, the impeller has a large overall size, which requires more installation space for the hub motor, making it difficult to miniaturize the hub motor. Summary of the Invention

[0004] This application provides a sensor, a hub motor, and a vehicle, which can reduce the space occupied inside the hub motor and facilitate the miniaturization of the hub motor.

[0005] One embodiment of this application discloses a hub motor, which is applied to a hub motor. The sensor includes: a sensing element adapted to be connected to the stator of the hub motor; and a follower element disposed opposite to the sensing element, adapted to be connected to the mover of the hub motor. The follower element includes an annular mounting platform and sensing teeth, with the sensing teeth disposed on the annular mounting platform.

[0006] In some embodiments, the sensing element includes a body portion and a mounting portion located at an end of the body portion, the sensing element being adapted to be mounted to the stator via the mounting portion.

[0007] In some embodiments, the sensing element is arc-shaped.

[0008] In some embodiments, the sensing element is flat.

[0009] In some implementations, the curvature of the arc matches the curvature of the annular mounting platform.

[0010] In some embodiments, the sensing element further includes a circuit board disposed on the body portion, the circuit board having a chip and an induction coil.

[0011] In some embodiments, the sensor further includes a connecting line connected to the circuit board, the connecting line being used to enable data transmission between the chip and the outside world.

[0012] In some embodiments, the sensing teeth are disposed on the inner or outer wall of the annular mounting platform.

[0013] In some embodiments, the sensing teeth comprise multiple pairs, with each pair of sensing teeth arranged opposite to each other.

[0014] In some implementations, the number of pairs of the sensing teeth is greater than or equal to 15.

[0015] In some embodiments, the sensing teeth are rectangular or trapezoidal.

[0016] In some embodiments, the annular mounting platform has a plurality of spaced mounting holes, through which the annular mounting platform is fixedly mounted to the mover.

[0017] In some embodiments, the sensor is an eddy current sensor.

[0018] This application also proposes a hub motor, comprising: a stator; a mover, the mover being rotatable relative to the stator; and a sensor as described in any of the above embodiments, wherein the sensing element is connected to the stator, and the follower element is connected to the mover.

[0019] In some embodiments, the stator includes a bottom wall and an annular side wall connected to the bottom wall, and the bottom wall of the stator has a fixing hole for mounting the sensing element.

[0020] In some embodiments, the stator has a perforation on its side wall, and the hub motor also includes a connector, through which the connecting wire of the sensing element passes and connects to the connector.

[0021] In some embodiments, the hub motor further includes a bearing, the bearing comprising an inner cylinder and an outer cylinder, the inner cylinder being rotatable relative to the outer cylinder, the inner cylinder being fixedly connected to the mover, the outer cylinder being fixedly connected to the stator, the inner cylinder having a follower inserted through it, the follower being disposed between the mover and the follower, and the sensing element being disposed between the follower and the stator.

[0022] In some embodiments, the mover, the follower, the sensor, and the stator are arranged sequentially along the axial direction of the bearing.

[0023] In some embodiments, the mover includes a bottom wall and an annular side wall, the annular side wall being disposed around the edge of the bottom wall, the side wall and the bottom wall forming a mounting cavity, and the bearing, the stator and the sensor are all disposed within the mounting cavity.

[0024] In some embodiments, the hub motor further includes a housing, and the mover and the housing are integrated into one unit.

[0025] This application also proposes a vehicle comprising: a hub motor as described in any of the above embodiments.

[0026] The sensor, hub motor, and vehicle disclosed in this application are implemented by applying the sensor to the hub motor. The sensor includes a sensing element and a follower element. The sensing element is adapted to be connected to the stator of the hub motor, and the follower element is disposed opposite to the sensing element. The follower element is adapted to be connected to the mover of the hub motor. The follower element includes an annular mounting platform and sensing teeth. The sensing teeth are disposed on the annular mounting platform. When the mover of the hub motor rotates, the follower element can rotate with the mover. The sensing teeth on the follower element can be captured by the sensing element to collect information, thereby monitoring the rotation of the follower element and obtaining rotation parameters (e.g., the rotational speed information, rotational angle information, etc. of the mover).

[0027] Since the space occupied by the sensor follower inside the hub motor only includes the annular mounting platform and the sensing teeth, and the center of the annular mounting platform is hollowed out, that is, when realizing the information acquisition of the sensor, there is still a lot of redundant space inside the annular mounting platform for the installation of the hub motor and the setting of other components (such as connecting wires, etc.). Therefore, the scheme of using the sensing teeth set in the follower as the sensing object of the sensor can reduce the space occupied by the follower inside the hub motor, and realize the lightweighting and miniaturization of the hub motor.

[0028] Furthermore, since the follower occupies less internal space in the hub motor, and the annular mounting platform of the follower provides more space for setting sensing teeth, the number of sensing teeth can be increased and guaranteed. Since the number of sensing teeth is positively correlated with the detection accuracy of the sensor, the detection accuracy of the sensor can be further improved while meeting the vehicle's lightweight requirements, thus enhancing the vehicle's safety.

[0029] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0030] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0031] Figure 1 This is a schematic diagram illustrating the application scenario of the hub motor according to certain embodiments of this application;

[0032] Figure 2 This is a schematic diagram of the structure of a hub motor according to certain embodiments of this application;

[0033] Figure 3 This is a schematic diagram of the structure of the mover of a hub motor according to certain embodiments of this application;

[0034] Figure 4 This is a schematic diagram of the stator structure of a hub motor according to certain embodiments of this application;

[0035] Figure 5 This is a schematic diagram of the structure of a hub motor according to certain embodiments of this application;

[0036] Figure 6 This is a schematic diagram of the structure of the follower of the sensor according to some embodiments of this application;

[0037] Figure 7 This is a schematic diagram of the sensing element of a sensor according to certain embodiments of this application;

[0038] Figure 8 This is a schematic diagram of the structure of a sensor according to certain embodiments of this application;

[0039] Figure 9 This is a schematic diagram of the structure of a hub motor according to certain embodiments of this application. Detailed Implementation

[0040] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of this application, and should not be construed as limiting the embodiments of this application.

[0041] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one feature. In the description of this application, "multiple" means at least two, such as two or three, unless otherwise explicitly specified.

[0043] To facilitate understanding of this application, the background of this application is explained below:

[0044] Currently, sensors are typically installed inside hub motors to measure vehicle wheel speeds, etc. The sensors usually use impellers (for example, the impellers are placed at the end of the rotor of the hub motor) as the sensing target. The impellers consist of a body in the middle and blades around the body. The impellers have a simple structure and low cost. By sensing the blades of the impellers, the vehicle wheel speed can be measured.

[0045] However, the impeller has a large overall size, which requires more installation space for the hub motor, making it difficult to miniaturize the hub motor.

[0046] To address the aforementioned technical problems, this application provides a hub motor that can be applied to vehicles and the like.

[0047] Please see Figure 1 First, the application scenarios of the technical solution of this application will be introduced. The sensor 10 provided in this application can be applied to the hub motor 100, and the hub motor 100 can be applied to, for example... Figure 1 Among the 1000 vehicles shown.

[0048] Alternatively, please continue reading Figure 1 The vehicle 1000 may include a vehicle suspension 200, which is connected to a hub motor 100 to achieve the connection between the vehicle 1000 and the hub motor 100.

[0049] Please see Figures 2 to 9 The following is a detailed description of the hub motor 100, which includes:

[0050] Stator 10;

[0051] The mover 20 is capable of rotating relative to the stator 10;

[0052] The sensor 30 has a sensing element 31 connected to the stator 10 and a follower element 32 connected to the mover 20.

[0053] The mover 20 rotates within the hub motor 100. The mover 20 may include conductive materials (such as copper or aluminum), etc. Please refer to [link to relevant documentation]. Figure 2 and Figure 5 The stator 10 is fixed in the hub motor 100, and the stator 10 can usually generate a magnetic field.

[0054] Sensor 30 includes:

[0055] The sensing element 31 is adapted to be connected to the stator 10 of the hub motor 100;

[0056] Follower 32 is disposed opposite to sensor 31. Follower 32 is adapted to be connected to mover 20 of hub motor 100. Follower 32 includes an annular mounting platform 321 and sensing teeth 322. Sensing teeth 322 are disposed on the annular mounting platform 321.

[0057] The sensor 30 may include an eddy current sensor 30, which is a non-contact sensor based on the principle of eddy currents. It detects the position or other features of an object by utilizing the phenomenon of eddy currents generated in a conductive material under an alternating magnetic field. The sensor 30 is located inside the hub motor 100, where a magnetic field generated by permanent magnets and energized coils exists, creating a complex magnetic field environment. In this complex environment, the sensing teeth 322 of the follower 32 serve as the sensing target for the eddy current sensor 30. Furthermore, the eddy current sensor 30 exhibits excellent resistance to stray magnetic field interference, ensuring its accuracy and further improving the accuracy of the collected data.

[0058] Specifically, the vehicle's tires can be mounted on the outside of the hub motor 100. By supplying power to the stator 10 of the hub motor 100 (for example, the hub motor 100 also includes a busbar 50 that can transfer electrical energy to the hub motor 100 (for example, to the stator 10 of the hub motor 100)), the stator 10 can generate a rotating magnetic field. Under the influence of the magnetic field generated by the stator 10, the mover 20 can rotate relative to the stator 10 based on the principle of electromagnetic induction. Referring to the figure, the mover 20 may include a cavity structure. The mover 20 can be integrated with the housing of the hub motor 100, saving installation space and reducing structural complexity.

[0059] For example, the hub motor 100 also includes a bearing 40, which includes an inner cylinder 41 and an outer cylinder 42. The inner cylinder 41 is fixedly connected to the mover 20, and the outer cylinder 42 is fixedly connected to the stator 10. Under the action of the magnetic field of the stator 10, when the mover 20 rotates, it can drive the inner cylinder 41 to rotate relative to the outer cylinder 42. The outer cylinder 42 is also fixedly connected to the vehicle suspension, and the vehicle's tires are fitted on the outside of the hub motor 100. When the mover 20 rotates relative to the stator 10 and the inner cylinder 41 rotates relative to the outer cylinder 42, the vehicle's wheels can be driven to rotate, thus propelling the vehicle.

[0060] Please see Figures 6 to 8 The hub motor 100 also includes a sensor 30, which includes a sensing element 31 and a follower element 32. The follower element 32 is the sensing target of the sensing element 31 (the sensing element 31 has a sensing module). The follower element 32 is disposed on the mover 20 (for example, see...). Figure 5The follower 32 can be fixed to the mover 20 using multiple fixing bolts. When the mover 20 rotates, the follower 32 rotates with the mover 20. Since the sensing element 31 is set on the stator 10, the follower 32 can rotate relative to the sensing element 31. The follower 32 is provided with an annular mounting platform 321 and sensing teeth 322 (magnetic poles). The sensing teeth 322 are set on the annular mounting platform 321. When the follower 32 rotates with the mover 20 of the hub motor 100, the sensing element 31 can sense the sensing teeth 322 on the follower 32 and generate an electrical signal to determine the rotation information of the mover 20 when it rotates based on the electrical signal (for example, by sensing the appearance or disappearance of the sensing teeth 322 (the change of the sensing teeth 322), the rotation information (speed information, angle information, etc.) can be determined).

[0061] In some embodiments, the sensing teeth 322 are disposed on the inner or outer wall of the annular mounting platform 321.

[0062] For example, please see Figure 6 Taking the sensing tooth 322 being set on the inner wall of the annular mounting platform 321 as an example, the sensing tooth 322 set on the inner wall can be formed by extending from the inner wall of the mounting platform 321 to the center of the annular mounting platform 321 (i.e., inner sensing tooth 322). The sensing tooth 322 can be sensed by the sensing element 31 so that the sensor 30 generates an electrical signal, thereby determining the information of the mover 20, that is, determining the information of the vehicle wheel based on the electrical signal (for example, the sensing element 31 can sense the appearance or disappearance of the sensing tooth 322 (change of sensing tooth 322) and generate a corresponding electrical signal, and calculate the wheel speed information, steering angle information, etc. based on the electrical signal).

[0063] For example, taking the sensing tooth 322 set on the outer wall of the annular mounting platform 321 as an example, the sensing tooth 322 set on the outer wall can be formed by extending from the outer wall of the mounting platform 321 toward the center of the annular mounting platform 321 in a direction away from the center (i.e., the outer sensing tooth 322). The center of the mounting platform 321 is hollowed out, and the sensing tooth 322 can be sensed by the sensing element 31 so that the sensor 30 generates an electrical signal.

[0064] Please see Figure 6 Optionally, the sensing teeth 322 include multiple pairs (two opposing sensing teeth 322 on the same diameter of the annular mounting platform 321 constitute a pair of sensing teeth 322), and each pair of sensing teeth 322 is arranged opposite to each other.

[0065] Among them, the number of pairs of sensing teeth 322 is greater than or equal to 15.

[0066] Among them, the sensing teeth 322 of the sensor 30 are positively correlated with the detection accuracy. When the number of logarithms of the sensing teeth 322 is greater than or equal to 15, the follower 32 can provide more signal changes to the sensor 31, which helps to capture the displacement or change of the follower 32, improve the detection accuracy, suppress signal interference, and improve the system reliability.

[0067] Please see Figure 6 Optionally, the sensing teeth 322 are rectangular or trapezoidal.

[0068] The sensing teeth 322 are set to be rectangular or trapezoidal, and the boundaries of each sensing tooth 322 are clear, making it easy to generate fast and stable signal changes. This allows the sensing element 31 to more easily identify each sensing tooth 322 and improve the sensing accuracy.

[0069] Please see Figure 7 Optionally, the sensing element 31 is arc-shaped, and / or the sensing element 31 is flat, which occupies less space, is easy to install, and meets the relatively strict space requirements inside the hub motor 100.

[0070] The curvature of the arc matches the curvature of the annular mounting platform 321, which can improve the response capability of the sensing element 31 to the follower element 32 and further improve the detection accuracy.

[0071] Optionally, the annular mounting platform 321 has a plurality of spaced mounting holes 323, and the annular mounting platform 321 is fixedly mounted to the mover 20 through the mounting holes 323.

[0072] The annular mounting platform 321 is provided with multiple spaced mounting holes 323, which can be fixedly connected to the mover 20 by means of bolts or the like.

[0073] Optionally, the sensing element 31 includes a body portion 311 and a mounting portion 312 located at the end of the body portion 311, and the sensing element 31 is adapted to be mounted to the stator 10 via the mounting portion 312.

[0074] The mounting portion 312 may include multiple portions. For example, the sensing element 31 includes a body portion 311 and two mounting portions 312 located at the ends of the body portion 311. The two mounting portions 312 are respectively located at both ends of the body portion 311, and the sensing element 31 is mounted to the stator 10 via the two mounting portions 312 (e.g., by screwing). For another example, please refer to... Figure 5 and Figure 8 The stator 10 includes a bottom wall 12 and an annular side wall 11. The annular side wall 11 is disposed on the bottom wall 12. The bottom wall 12 of the stator 10 has two fixing holes 121. The two mounting parts 312 of the sensing element 31 are respectively screwed into the two fixing holes 121 to fix the sensing element 31 to the stator 10.

[0075] It is understood that by setting sensing teeth 322 (inner sensing teeth 322 or outer sensing teeth 322) on the inner wall of the annular mounting platform 321, the sensing element 31 can collect information based on the sensing teeth 322. The space occupied by the follower 32 inside the hub motor 100 only includes the annular mounting platform 321 and the sensing teeth 322. In other words, when realizing the function of the sensor 30 in collecting information, the annular mounting platform 321 still has a lot of redundant space for the hub motor 100 to install and set other components (such as connecting wires 314, etc.). Therefore, setting sensing teeth 322 (inner sensing teeth 322 or outer sensing teeth 322) inside the follower 32 can reduce the space occupied by the follower 32 inside the hub motor 100.

[0076] Compared to current methods that use a simple impeller inside the hub motor 100 as the sensing target of the sensor 30, the limited internal space of the hub motor 100 and the relatively large space occupied by the impeller result in a smaller space for setting the magnetic poles sensed by the sensor 30, meaning fewer pole pairs can be set. In contrast, this application uses a follower 32 as the sensing target of the sensor 30, with sensing teeth 322 (magnetic poles) set on the follower 32. The follower 32 occupies less internal space in the hub motor 100, providing more space for setting the magnetic poles and increasing the number of magnetic poles (sensing teeth 322). Since the number of magnetic poles is positively correlated with the detection accuracy of the sensor 30, this application can improve the detection accuracy of the sensor 30 and enhance vehicle safety while meeting vehicle lightweighting requirements.

[0077] Furthermore, currently, the sensor housing 30 is typically fixed to the vehicle's suspension using multiple bolts. This fixing method occupies a significant amount of space and can easily interfere with other vehicle components during the rotation of the hub motor 100 and the target wheel sensed by the hub motor 100. In contrast, the sensing element 31 of this application is arc-shaped, occupying less space. The sensing element 31 includes a body portion 311 and a mounting portion 312 located at the end of the body portion 311. When the sensing element 31 is mounted on the stator 10, it can be fixed via the mounting portion 312 (e.g., by bolting the mounting portion 312 to the stator 10), achieving a fixed connection between the sensing element 31 and the stator 10, providing sufficient installation stability. Furthermore, it saves internal installation space in the hub motor 100, avoids interference from the sensing element 31 with other internal components of the hub motor 100, increases internal layout space in the hub motor 100, and reduces the usage risks of the hub motor 100.

[0078] Please refer to the figure. In some embodiments, the sensing element 31 also includes a circuit board 313, which is disposed on the body portion 311 and has a chip and a sensing coil.

[0079] The sensing element 31 also includes a connecting line 314, which is connected to the circuit board 313 and is used to realize data transmission between the chip and the outside.

[0080] The chip can be used to collect the electrical parameters of the induction coil, generate the rotation angle data of the hub motor 100 based on the electrical parameters, and output the rotation angle data through the connection line 314.

[0081] Specifically, the sensor 30 also includes a printed circuit board (PCB) 313 and connecting wires 314. The PCB is mounted on the sensing element 31 and connects to the pins of external circuits (e.g., by soldering) to realize signal input, output, power supply, etc. The connecting wires 314 can connect to external low-voltage connectors to ensure smooth transmission of current and electrical signals. The PCB has a chip and an induction coil (e.g., the chip can be glued onto the PCB 313; or the induction coil can be etched). The change in the position of the follower 32 on the induction coil causes a voltage change, which changes the electrical parameters of the induction coil. The chip can collect the electrical parameters of the induction coil. Finally, based on the electrical parameters collected by the chip, for example through the vehicle's processor, the rotation angle data of the hub motor 100 can be determined, and the rotation angle data can be output through the connecting wires 314.

[0082] For example, when the follower 32 rotates following the mover 20, the sensing teeth 322 on the follower 32 sequentially pass over the sensing element 31 and are sensed by the sensing element 31. The follower 32 can be equipped with four secondary induction coils (arranged in the shapes of SIN+, SIN-, COS+, and COS-, respectively). During the movement of the follower 32 following the mover 20, the change in the position of the sensing coils of the follower 32 can cause a voltage change. The chip collects the change signal, conditions and outputs analog or digital signals (including four output signals: SIN+, SIN-, COS+, and COS-), and then performs arctangent calculation to obtain the rotation angle data.

[0083] That is, when outputting four signals SIN+, SIN-, COS+, and COS-, the sine and cosine signals are first differentially calculated to obtain SINdiff = (SIN+) - (SIN-) and COSdiff = (COS+) - (COS-). Then, the rotation angle is calculated based on the arctangent, that is, the rotation angle data theta = arctan(SINdiff / COSdiff).

[0084] Please see Figure 9In some embodiments, the stator 10 includes a bottom wall 12 and an annular side wall 11 connected to the bottom wall 12. The bottom wall 12 of the stator 10 has a fixing hole 121 for mounting the sensing element 31.

[0085] The stator 10 has a through hole 13 on its side wall 11. The hub motor 100 also includes a connector. The connecting wire 314 of the sensing element 31 passes through the through hole 13 and is connected to the connector.

[0086] Specifically, please refer to Figure 9 The stator 10 includes a bottom wall 12 and an annular side wall 11 connected to the bottom wall 12. The bottom wall 12 of the stator 10 has a mounting hole 323 for mounting a sensor 31 (e.g., by screwing it into the mounting portion 312 of the sensor 31). The stator 10 includes a bottom wall 12 and a side wall 11. The side wall 11 is located at the edge of the bottom wall 12; for example, the side wall 11 may extend from the outer edge of the bottom wall 12 away from it. The side wall 11 of the stator 10 has a through hole 13. The wiring harness of the sensor 30 (e.g., connecting wire 314) can be connected to a low-voltage connector through the through hole 13 to collect and organize the wiring harness, enabling power supply connection to the sensor 30 and the installation arrangement of signal lines.

[0087] In some embodiments, the hub motor 100 further includes a bearing 40, which includes an inner cylinder 41 and an outer cylinder 42. The inner cylinder 41 is rotatable relative to the outer cylinder 42. The inner cylinder 41 is fixedly connected to the mover 20, and the outer cylinder 42 is fixedly connected to the stator 10. A follower 32 passes through the inner cylinder 41 and is disposed between the mover 20 and the follower 32. A sensing element 31 is disposed between the follower 32 and the stator 10.

[0088] Along the axial direction of the bearing 40, the mover 20, follower 32, sensor 31 and stator 10 are arranged in sequence.

[0089] For example, please see Figure 2 The mover 20 includes a bottom 21 and a recess 22. The bottom 21 includes a bottom wall 12 and a side wall 11. The side wall 11 extends outward around the bottom wall 12. The recess 22 is located on the bottom wall 12, and the recess direction of the recess 22 is the same as that of the side wall 11. Along the axial direction of the bearing 40, on the projection of the mover 20 onto the ground, the mover 20, follower 32, sensor 31, and stator 10 are arranged sequentially. Alternatively, since the annular mounting platform 321 of the follower 32 is hollowed out in the middle, the annular mounting platform 321 can be fitted onto the recess 22 of the mover 20, and then the sensor 31 and stator 10 are arranged sequentially along the axial direction of the bearing 40 (along the recess direction of the recess 22).

[0090] Specifically, the hub motor 100 includes a mover 20, a stator 10, a bearing 40, and a sensor 30. The bearing 40 can support the mover 20 and the stator 10. The inner cylinder 41 can rotate relative to the outer cylinder 42. The inner cylinder 41 can be fixedly connected to the mover 20. The outer cylinder 42 of the bearing 40 can be fixedly mounted on the vehicle suspension (fixedly connected to the vehicle suspension) and fixedly connected to the stator 10. The mover 20 can rotate under the action of the magnetic field generated after the stator 10 is energized, and drive the inner cylinder 41 to rotate relative to the outer cylinder 42, thereby reducing friction loss and energy loss and improving speed and efficiency.

[0091] In current impeller-based detection methods, the impeller is typically located at the end of the mover 20 of the hub motor 100. Under high-speed rotation, the impeller is prone to detachment, posing a significant safety hazard. This application addresses this by inserting a follower 32 through the inner cylinder 41. Along the axial direction of the bearing 40, the mover 20, follower 32, sensing element 31, and stator 10 are sequentially arranged in a through-shaft design. The sensing element 31 is positioned on the surfaces opposite the stator 10 and the mover 20, and the follower 32 is positioned on the surfaces opposite the mover 20 and the stator 10. This effectively confines the sensor 30 between the mover 20 and the stator 10, preventing the sensor 30 (sensing element 31 and follower 32) from detaching and improving the installation stability of the sensor 30.

[0092] Optionally, please refer to Figure 3 The mover includes a bottom wall 21 and an annular side wall 22. The annular side wall 22 is arranged around the edge of the bottom wall 21. The side wall 22 and the bottom wall 21 form a mounting cavity 23. The bearing 40, the stator 10 and the sensor 30 are all arranged in the mounting cavity 23.

[0093] Specifically, please refer to Figure 3 The mover includes a bottom wall 21 and an annular side wall 22. The annular side wall 22 is arranged around the edge of the bottom wall 21. The annular side wall 22 can be formed by extending from the outer edge of the bottom wall 21 in a direction away from the bottom wall 21. The side wall 22 and the bottom wall 21 form a mounting cavity 23. The bearing 40, the stator 10 and the sensor 30 are all arranged in the mounting cavity 23.

[0094] Optionally, the hub motor 100 also includes a housing, with the mover 20 and the housing integrated into one unit, which can further save installation space and production costs.

[0095] Thus, the sensor 30 is applied to the hub motor 100. The sensor 30 includes a sensing element 31 and a follower element 32. The sensing element 31 is adapted to be connected to the stator 10 of the hub motor 100. The follower element 32 is disposed opposite to the sensing element 31 and is adapted to be connected to the mover 20 of the hub motor 100. The follower element 32 includes an annular mounting platform 321 and sensing teeth 322. The sensing teeth 322 are disposed on the annular mounting platform 321. When the mover 20 of the hub motor 100 rotates, the follower element 32 can rotate with the mover 20. The sensing teeth 322 on the follower element 32 can be captured by the sensing element 31 to collect information, thereby monitoring the rotation of the follower element 32 and obtaining rotation parameters (e.g., the rotation speed information, angle information, etc. of the mover 20).

[0096] Since the space occupied by the follower 32 of the sensor 30 inside the hub motor 100 only includes the annular mounting platform 321 and the sensing teeth 322, and the annular mounting platform 321 is hollow in the middle, that is, when the sensor 30 collects information, the annular mounting platform 321 still has a lot of redundant space for the hub motor 100 to install and set other components (such as connecting wires), the scheme of using the sensing teeth 322 set in the follower 32 as the sensing object of the sensor 31 can reduce the space occupied by the follower 32 inside the hub motor 100, and realize the lightweight and miniaturization of the hub motor 100.

[0097] Furthermore, since the follower 32 occupies a small amount of internal space in the hub motor 100, while the space available for setting the sensing teeth 322 on the annular mounting platform 321 of the follower 32 is large, the number of sensing teeth 322 can be increased and guaranteed. Since the number of sensing teeth 322 is positively correlated with the detection accuracy of the sensor 30, the detection accuracy of the sensor 30 can be further improved while meeting the vehicle's lightweight requirements, thereby enhancing the vehicle's safety.

[0098] It is understandable that during vehicle operation, under conditions such as turning or tilting, the central shaft of sensor 30 and the housing of hub motor 100 will rotate relative to each other, causing relative displacement between the impeller and sensor 30, resulting in distortion of the displacement sensing of sensor 30 and system failure. However, the stator 10 of this application includes a bottom wall 12 and an annular sidewall 11 disposed on the bottom wall 12. The sensing element 31 is then fixed to the stator 10. Even under conditions such as turning or tilting, the relative position between sensor 30 (and its follower 32) and stator 10 can be kept stable, enhancing the installation stability of sensing element 31 and ensuring that the sensing distance and angle between follower 32 and sensing element 31 do not change, thus enhancing the stability of sensor 30.

[0099] Please refer to it again. Figure 1The vehicle 1000 in this application includes the hub motor 100 described in any of the above embodiments, and will not be described again here for the sake of brevity.

[0100] In the description of this specification, the references to terms such as "some embodiments," "in one example," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0101] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this application pertain.

[0102] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A sensor, characterized in that, The sensor, used in a hub motor, includes: A sensing element, the sensing element being adapted to be connected to the stator of a hub motor; A follower is disposed opposite to the sensing element. The follower is adapted to connect with the moving part of the hub motor. The follower includes an annular mounting platform and sensing teeth, with the sensing teeth disposed on the annular mounting platform.

2. The sensor according to claim 1, characterized in that, The sensing element includes a body portion and a mounting portion located at the end of the body portion, and the sensing element is adapted to be mounted to the stator via the mounting portion.

3. The sensor according to claim 1, characterized in that, The sensing element is arc-shaped.

4. The sensor according to claim 3, characterized in that, The sensing element is flat.

5. The sensor according to claim 3, characterized in that, The curvature of the arc matches the curvature of the annular mounting platform.

6. The sensor according to claim 1, characterized in that, The sensing element also includes a circuit board, which is disposed on the body of the sensing element and has a chip and a sensing coil.

7. The sensor according to claim 6, characterized in that, The sensing element also includes a connecting line, which is connected to the circuit board and is used to enable data transmission between the chip and the outside world.

8. The sensor according to claim 1, characterized in that, The sensing teeth are disposed on the inner or outer wall of the annular mounting platform.

9. The sensor according to any one of claims 1 to 8, characterized in that, The sensing teeth include multiple pairs, with each pair of sensing teeth arranged opposite to each other.

10. The sensor according to claim 9, characterized in that, The number of pairs of the sensing teeth is greater than or equal to 15.

11. The sensor according to claim 1, characterized in that, The sensing teeth are rectangular or trapezoidal.

12. The sensor according to claim 1, characterized in that, The annular mounting platform has multiple spaced mounting holes, and the annular mounting platform is fixedly mounted to the moving part through the mounting holes.

13. The sensor according to any one of claims 1-12, characterized in that, The sensor is an eddy current sensor.

14. A hub motor, characterized in that, include: stator; A mover, which is capable of rotating relative to the stator; The sensor according to any one of claims 1-13, wherein the sensing element is connected to the stator and the follower element is connected to the mover.

15. The hub motor according to claim 14, characterized in that, The stator includes a bottom wall and an annular side wall connected to the bottom wall. The bottom wall of the stator has a fixing hole for mounting the sensing element.

16. The hub motor according to claim 14 or 15, characterized in that, The stator has a through hole on its side wall, and the hub motor also includes a connector. The connecting wire of the sensing element passes through the through hole and is connected to the connector.

17. The hub motor according to claim 14, characterized in that, The hub motor also includes a bearing, which includes an inner cylinder and an outer cylinder. The inner cylinder is rotatable relative to the outer cylinder. The inner cylinder is fixedly connected to the mover, and the outer cylinder is fixedly connected to the stator. The follower passes through the inner cylinder and is disposed between the mover and the follower. The sensing element is disposed between the follower and the stator.

18. The hub motor according to claim 17, characterized in that, Along the axial direction of the bearing, the mover, the follower, the sensor, and the stator are arranged in sequence.

19. The hub motor according to claim 14, characterized in that, The moving part includes a bottom wall and an annular side wall. The annular side wall is arranged around the edge of the bottom wall. The side wall and the bottom wall form a mounting cavity. The bearing of the hub motor, the stator and the sensor are all arranged in the mounting cavity.

20. The hub motor according to claim 14, characterized in that, The hub motor also includes a housing, and the mover and the housing are integrated into one unit.

21. A vehicle, characterized in that, include: The hub motor according to any one of claims 14-20.

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