Integrated hub motor for electric assist bicycles

Abstract

The present invention provides an integrated wheel hub motor suitable for an electric power-assisted bicycle, comprising a flywheel assembly, a torque sensor assembly, and a motor assembly, wherein the torque sensor assembly comprises a rotor printed circuit board assembly and a stator printed circuit board assembly, wherein the rotor printed circuit board assembly and the stator printed circuit board assembly can interact with each other; wherein the motor assembly comprises a motor stator, a motor rotor, and a motor central shaft, wherein the motor stator is nested on the motor central shaft, and the motor rotor is rotatably mounted on the motor central shaft; wherein the rotor printed circuit board assembly is mounted on the flywheel assembly, the stator printed circuit board assembly is mounted on the motor stator and / or the motor central shaft, and the flywheel assembly is mounted on the motor central shaft, and the flywheel assembly is respectively connected to the motor stator and the motor rotor. The present invention has a simple and reasonable structure, integrates the torque sensor with the wheel hub motor, can perform power assist compensation according to the torque actually required by the user, and has good practicality.

Description

Technical Field

[0001] The invention relates to a hub motor, in particular to an integrated hub motor suitable for an electric power-assisted bicycle, in particular to an integrated hub motor for the rear wheel of an electric power-assisted bicycle. Background Art

[0002] Electric power-assisted bicycles are a new type of two-wheeled vehicle that uses batteries as auxiliary power sources and is equipped with motors as power assistance. It is a new type of transportation that can integrate human riding and motor assistance. Compared with commonly used electric power-assisted bicycles, electric power-assisted bicycles do not have control valves (i.e., accelerator handles), but instead accelerate the bicycle by collecting pedal speed and torque signals and cooperating with motor assistance. Therefore, the torque sensor is one of the most critical components on electric power-assisted bicycles.

[0003] At present, the torque sensors commonly used in electric power-assisted bicycles mostly use Hall effect sensors. However, the Hall effect sensors have low linear accuracy and are easily demagnetized at high temperatures, which will cause the Hall sensor accuracy error to increase, making it impossible to truly restore the torque size and reduce the assisted mileage. The installation method of the traditional motor torque sensor requires a large installation space inside the motor, and has the characteristics of multiple parts and complex structure.

[0004] The patent document with the publication number CN205417979U discloses a new type of power-assisting sensor, including a bracket, a Hall sensor and a sprocket, a magnetic steel is installed around the side of the sprocket, the sprocket is installed on the bracket through the sprocket shaft, the Hall sensor is arranged on the sprocket shaft corresponding to the magnetic steel, and the other end of the bracket is connected to the mounting plate through a connecting pipe, and a torsion spring is arranged in the connecting pipe. The technical solution of the patent document installs the sprocket on a swinging rod that can swing freely. Since the swinging rod and the mounting plate are connected by a connecting pipe with a torsion spring, the swinging rod has the function of resetting and tightening the chain, and the mounting plate can be directly installed on the rear axle of an ordinary bicycle, so that the vehicle speed can be accurately collected. However, the stability of the measurement accuracy of the Hall sensor is easily disturbed by the external environment. In addition, there is no integrated motor. If power assistance is required, an additional motor needs to be set, which makes the structure relatively complex and the integration is not high. Summary of the invention

[0005] In view of the defects in the prior art, an object of the present invention is to provide an integrated hub motor suitable for an electric power-assisted bicycle.

[0006] An integrated hub motor suitable for an electric power-assisted bicycle provided by the present invention comprises a flywheel assembly, a torque sensor assembly, and a motor assembly, wherein the torque sensor assembly comprises a rotor printed circuit board assembly and a stator printed circuit board assembly, and the rotor printed circuit board assembly and the stator printed circuit board assembly can interact with each other;

[0007] The motor assembly comprises a motor stator, a motor rotor and a motor central shaft, wherein the motor stator is nested on the motor central shaft, and the motor rotor is rotatably mounted on the motor central shaft;

[0008] The rotor printed circuit board assembly is mounted on the flywheel assembly, the stator printed circuit board assembly is mounted on the motor stator and / or the motor central shaft, the flywheel assembly is mounted on the motor central shaft, and the flywheel assembly is respectively connected to the motor stator and the motor rotor.

[0009] Preferably, the flywheel assembly comprises a first bearing, a flywheel, a flywheel cover, a second bearing, a flywheel mounting seat and a third bearing;

[0010] The flywheel is mounted on the motor shaft through a first bearing, the card fly mounting seat is nested on the flywheel and mounted on the motor shaft through a third bearing, and the flywheel cover is connected to the card fly mounting seat through a second bearing;

[0011] The flywheel cover is connected to the motor rotor to form a receiving space, and the torque sensor assembly and the motor stator are located inside the receiving space;

[0012] The flywheel can be connected to a chain or pedals of an external electric power-assisted bicycle.

[0013] Preferably, the flywheel mounting seat is provided with a protrusion on the circumference, a spring is provided inside the protrusion, and the flywheel cover is provided with a slot on the circumference, the protrusion is mounted in the slot and connected to the slot via the spring.

[0014] Preferably, there is a gap between the protrusion and the slot.

[0015] Preferably, the rotor printed circuit board assembly comprises an inner rotor printed circuit board and an outer rotor printed circuit board;

[0016] The inner rotor printed circuit board is mounted on the inner end surface of the flywheel mounting seat, and the outer rotor printed circuit board is mounted on the end surface of the flywheel cover.

[0017] Preferably, the plane where the end face of the flywheel cover is located is higher than the plane where the end face of the protrusion of the flywheel mounting seat is located.

[0018] Preferably, the inner rotor printed circuit board and the outer rotor printed circuit board are concentric rings, and a plurality of groups of metal components are arranged on the annular end surfaces of the inner rotor printed circuit board and the outer rotor printed circuit board, and the metal components include a plurality of metal blades;

[0019] On the inner rotor printed circuit board, the plurality of groups of metal components are evenly distributed relative to the center of the inner rotor printed circuit board, and the plurality of metal blades in one group of metal components are evenly distributed at intervals and radially distributed relative to the center of the inner rotor printed circuit board;

[0020] On the outer rotor printed circuit board, the multiple groups of metal components are evenly distributed relative to the center of the outer rotor printed circuit board, and multiple metal blades in one group of metal components are evenly distributed at intervals and radially distributed relative to the center of the outer rotor printed circuit board.

[0021] Preferably, the radiation angle of a group of metal components on the outer rotor printed circuit board is equal to the radiation angle of a group of metal components on the inner rotor printed circuit board.

[0022] Preferably, the stator printed circuit board assembly comprises an outer receiving coil assembly, an inner receiving coil assembly, an excitation coil, a signal processing module and a circuit board body;

[0023] The circuit board body is ring-shaped, and the external receiving coil assembly, the internal receiving coil assembly, the excitation coil and the signal processing module are all arranged on the circuit board body. The external receiving coil assembly, the internal receiving coil assembly and the excitation coil are all connected to the signal processing module. The internal receiving coil assembly is located on the inner side of the external receiving coil assembly, and the vertical mapping range of the excitation coil on the circuit board body surrounds the internal receiving coil assembly and the external receiving coil assembly.

[0024] Preferably, the shape and size of the vertical mapping plane of the outer receiving coil assembly are the same as those of the outer rotor printed circuit board of the rotor printed circuit board assembly and can be vertically mapped onto the outer rotor printed circuit board of the rotor printed circuit board assembly;

[0025] The shape and size of the vertical mapping plane of the inner receiving coil assembly are the same as those of the inner rotor printed circuit board of the rotor printed circuit board assembly and can be vertically mapped onto the inner rotor printed circuit board of the rotor printed circuit board assembly.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention has a simple and reasonable structure, integrates the torque sensor with the wheel hub motor, can perform power assistance compensation according to the torque actually required by the user, and has good practicality.

[0028] 2. The torque sensor assembly of the present invention is arranged inside the wheel hub motor and will not be exposed to the external environment, so that the service life of the torque sensor assembly is extended.

[0029] 3. The present invention arranges a spring between the chopper mounting seat and the flywheel cover, mounts the outer rotor printed circuit board on the flywheel cover, and mounts the inner rotor printed circuit board on the chopper mounting seat. When the flywheel rotates and drives the chopper mounting seat to rotate, a rotational torque is generated between the chopper mounting seat and the flywheel cover through the spring, and is transmitted to the stator printed circuit board assembly through the outer rotor printed circuit board and the inner rotor printed circuit board, thereby accurately measuring the rotational torque and compensating the torque through the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0031] Figure 1 It is a schematic diagram of the explosion structure of the present invention.

[0032] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention from one angle.

[0033] Figure 3 It is a schematic diagram of the three-dimensional structure from another angle of the present invention.

[0034] Figure 4 It is a cross-sectional structural schematic diagram of the present invention.

[0035] Figure 5 It is a schematic diagram of the connection structure of the flywheel mounting seat, the flywheel cover and the flywheel of the present invention.

[0036] Figure 6 It is a schematic diagram of the connection result between the flywheel mounting seat and the flywheel cover of the present invention.

[0037] Figure 7 It is a structural schematic diagram of the card fly mounting seat of the present invention.

[0038] Figure 8 The figure is a schematic diagram of the connection structure between the rotor printed circuit board assembly, the flywheel mounting seat and the flywheel cover of the present invention.

[0039] Fig. 9 The figure is a schematic diagram of the connection structure between the stator printed circuit board assembly and the motor stator of the present invention.

[0040] Fig.10 It is a schematic structural diagram of the rotor printed circuit board assembly of the present invention.

[0041] Fig.11 It is a schematic structural diagram of the stator printed circuit board assembly of the present invention.

[0042] The figure shows:

[0043] First bearing 1 Excitation coil 703

[0044] Flywheel 2 signal processing module 704

[0045] Flywheel cover 3 Third bearing 8

[0046] Second bearing 4 Motor stator 9

[0047] Kafei mounting seat 5 Fourth bearing 10

[0048] Rotor PCB assembly 6 Motor rotor 11

[0049] Inner rotor printed circuit board 6a Motor center shaft 12

[0050] Outer rotor printed circuit board 6b End face 13 of flywheel cover

[0051] Metal blade 601 convex end face 14a of the card fly mounting seat

[0052] Stator printed circuit board assembly 7 Inner end surface 14b of the card fly mounting seat

[0053] External receiving coil assembly 701 Spring 15

[0054] Internal receiving coil assembly 702 DETAILED DESCRIPTION

[0055] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0056] According to the present invention, an integrated hub motor suitable for an electric power-assisted bicycle is provided. Figure 1-4 As shown, it includes a flywheel assembly, a torque sensor assembly, and a motor assembly. The torque sensor assembly includes a rotor printed circuit board assembly 6 and a stator printed circuit board assembly 7. The rotor printed circuit board assembly 6 and the stator printed circuit board assembly 7 can interact with each other; the motor assembly includes a motor stator 9, a motor rotor 11 and a motor central shaft 12. The motor stator 9 is nested on the motor central shaft 12, and the motor rotor 11 is rotatably mounted on the motor central shaft 12; the rotor printed circuit board assembly 6 is mounted on the flywheel assembly, the stator printed circuit board assembly 7 is mounted on the motor stator 9 and / or the motor central shaft 12, the flywheel assembly is mounted on the motor central shaft 12, and the flywheel assembly is connected to the motor stator 9 and the motor rotor 11 respectively. The motor rotor 11 is connected to the motor central shaft 12 through a fourth bearing 10. Preferably, the flywheel 2 adopts a nine-speed flywheel. Preferably, the stator printed circuit board assembly 7 is fitted on the inner side of the motor stator 9 through a tooling interference fit, and can also be mounted on the sleeve on the motor central shaft 12 by screws.

[0057] like Figure 1 As shown, the flywheel assembly includes a first bearing 1, a flywheel 2, a flywheel cover 3, a second bearing 4, a card fly mounting seat 5 and a third bearing 8; the flywheel 2 is mounted on the motor center shaft 12 through the first bearing 1, the card fly mounting seat 5 is nested on the flywheel 2 and mounted on the motor center shaft 12 through the third bearing 8, and the flywheel cover 3 is connected to the card fly mounting seat 5 through the second bearing 4; the flywheel cover 3 is connected to the motor rotor 11 to form an accommodating space, and the torque sensor assembly and the motor stator 9 are located inside the accommodating space; the flywheel 2 can be connected to the chain or pedal of an external electric power-assisted bicycle.

[0058] like Figure 5-7 As shown, the flywheel mounting seat 5 is provided with a convex block on the circumference, and a spring 15 is provided inside the convex block. The flywheel cover 3 is provided with a slot on the circumference, and the convex block is mounted in the slot and connected to the slot through the spring 15. There is a gap between the convex block and the slot, that is, Figure 6 The middle gap d. Figure 5 , 6 As shown in FIG8 , the rotor printed circuit board assembly 6 includes an inner rotor printed circuit board 6a and an outer rotor printed circuit board 6b; the inner rotor printed circuit board 6a is mounted on the inner end face 14b of the caffeine mounting seat, and the outer rotor printed circuit board 6b is mounted on the end face 13 of the flywheel cover. The plane where the end face 13 of the flywheel cover is located is higher than the plane where the protruding block end face 14a of the caffeine mounting seat is located. In one embodiment, the plane where the end face 13 of the flywheel cover is located is 1 mm higher than the plane where the protruding block end face 14a of the caffeine mounting seat is located, so that the inner rotor printed circuit board 6a and the outer rotor printed circuit board 6b can rotate independently without interfering with each other.

[0059] like Fig.10As shown, the inner rotor printed circuit board 6a and the outer rotor printed circuit board 6b are concentric rings, and multiple groups of metal components are arranged on the annular end faces of the inner rotor printed circuit board 6a and the outer rotor printed circuit board 6b, and the metal components include multiple metal blades 601; on the inner rotor printed circuit board 6a, the multiple groups of metal components are evenly distributed relative to the center of the inner rotor printed circuit board 6a, and the multiple metal blades 601 in one group of metal components are evenly distributed at intervals and radially distributed relative to the center of the inner rotor printed circuit board 6a; on the outer rotor printed circuit board 6b, the multiple groups of metal components are evenly distributed relative to the center of the outer rotor printed circuit board 6b, and the multiple metal blades 601 in one group of metal components are evenly distributed at intervals and radially distributed relative to the center of the outer rotor printed circuit board 6b. The radiation angle of one group of metal components on the outer rotor printed circuit board 6b is equal to the radiation angle of one group of metal components on the inner rotor printed circuit board 6a. Preferably, on the inner rotor printed circuit board 6a and the outer rotor printed circuit board 6b, the metal components are periodically and repeatedly arranged.

[0060] like Fig.11 As shown, the stator printed circuit board assembly 7 includes an outer receiving coil assembly 701, an inner receiving coil assembly 702, an excitation coil 703, a signal processing module 704 and a circuit board body; the circuit board body is annular, the outer receiving coil assembly 701, the inner receiving coil assembly 702, the excitation coil 703 and the signal processing module 704 are all arranged on the circuit board body, the outer receiving coil assembly 701, the inner receiving coil assembly 702 and the excitation coil 703 are all connected to the signal processing module 704, the inner receiving coil assembly 702 is located on the inner side of the outer receiving coil assembly 701, and the excitation coil 703 is vertically mapped on the circuit board body to surround the inner receiving coil assembly 702 and the outer receiving coil assembly 701. The shape and size of the vertical mapping plane of the external receiving coil component 701 are the same as the outer rotor printed circuit board 6b of the rotor printed circuit board assembly 6 and can be vertically mapped to the outer rotor printed circuit board 6b of the rotor printed circuit board assembly 6; the shape and size of the vertical mapping plane of the internal receiving coil component 702 are the same as the inner rotor printed circuit board 6a of the rotor printed circuit board assembly 6 and can be vertically mapped to the inner rotor printed circuit board 6a of the rotor printed circuit board assembly 6. Preferably, the excitation coil 703 is at least one group, and the excitation coil 703 is composed of one or more turns of metal wires wound in a circumferential direction in series, and the excitation coil 703 wraps the inner receiving coil component 702 and the outer receiving coil component 701 in the plane where the stator printed circuit board assembly 7 is vertically mapped; the signal processing module 704 can be connected to an external motor controller. Preferably, the external receiving coil component 701 includes multiple external receiving coils, and the multiple external receiving coils are respectively wound with multiple quasi-sinusoidal closed metal wires (such as Fig.11), and the current directions of two adjacent closed metal wires are opposite; the outer receiving coil component 701 overlaps with the plane where the outer rotor printed circuit board 6b is vertically mapped. Similarly, the inner receiving coil component 702 includes multiple inner receiving coils, and the multiple inner receiving coils are respectively wound with multiple quasi-sine closed metal wires (such as Fig.11 ), and the current directions of two adjacent closed metal wires are opposite; the inner receiving coil component 702 overlaps with the plane where the inner rotor printed circuit board 6a is vertically mapped.

[0061] After the stator printed circuit board assembly 7 is powered on, the excitation coil 703 generates a high-frequency alternating voltage and current to form an alternating electromagnetic field in its surrounding area. According to Faraday's law of electromagnetic induction, the magnetic flux passing through the closed coil changes, which will generate an induced electromotive force on the closed coil. When the alternating electromagnetic field generated by the excitation coil 703 passes through the outer receiving coil assembly 701 and the inner receiving coil assembly 702, respectively, it will generate an induced electromotive force on multiple quasi-sinusoidal closed metal wires on the outer receiving coil assembly 701 and the inner receiving coil assembly 702. When the inner rotor printed circuit board 6a and the outer rotor printed circuit board 6b rotate, the metal blade 601 on the inner rotor printed circuit board 6a changes the alternating electromagnetic field strength of the excitation coil 703 in the area of ​​the inner receiving coil assembly 702, thereby causing the induced electromotive force on the inner receiving coil assembly 702 to change; the metal blade 601 on the outer rotor printed circuit board 6b changes the alternating electromagnetic field strength of the excitation coil 703 in the area of ​​the outer receiving coil assembly 701, thereby causing the induced electromotive force on the outer receiving coil assembly 701 to change. The induced electromotive force on the outer receiving coil assembly 701 and the induced electromotive force on the inner receiving coil assembly 702 are input to the signal processing module, and a torque signal is obtained by calculation, and the torque signal is transmitted to the motor controller, thereby controlling whether the motor performs assisting.

[0062] The advantage of the present invention is that compared with the Hall sensor, the torque sensor assembly shown in the present invention does not use a magnet, is not only immune to external magnetic field interference, but also not affected by high temperature demagnetization, thereby ensuring the reliability of the sensor signal; since the torque sensor assembly is not affected by external magnetic field interference, it can be installed inside the motor stator, thereby reducing the overall size of the motor. At the same time, the motor has fewer overall parts, low cost, and simple manufacturing process.

[0063] The working principle of the present invention is as follows: in one embodiment, an integrated hub motor suitable for an electric power-assisted bicycle is installed on the electric power-assisted bicycle and powered on. During the riding of the electric power-assisted bicycle, within a short period of time when the user steps on the pedal, the bicycle chain drives the flywheel 2 to rotate together, and the card fly mounting seat 5 nested on the flywheel 2 rotates together. At this time, the flywheel cover 3 installed on one side of the motor rotor 11 is fixed, so that the spring 15 installed between the card fly mounting seat 5 and the flywheel cover 3 is squeezed and deformed, and the inner rotor printed circuit board 6a installed on the inner end face 14b of the card fly mounting seat rotates with the card fly mounting seat 5, so that the corresponding inner receiving coil on the stator printed circuit board assembly 7 The induced electromotive force on the component 702 changes, while the outer rotor printed circuit board 6b installed on the end face 13 of the flywheel cover is fixed at this time, so that the induced electromotive force on the corresponding outer receiving coil component 701 on the stator printed circuit board component 7 does not change, and a difference voltage signal appears between the two induced electromotive forces. The magnitude of this difference voltage signal is equal to the magnitude of the torque. The signal processing module 704 inputs the voltage signal into the motor controller. After receiving the signal, the motor controller supplies power to the motor, so that the motor rotor 11 starts to rotate. At the same time, the electronic rotor 11 drives the flywheel cover 3 to rotate together. After the flywheel cover 3 rotates, the deformation of the spring 15 is restored. At this time, the difference value voltage of the two induced electromotive forces returns to zero, and the motor stops supplying power. When the user steps on the pedal next time, the above action is repeated, thereby achieving the effect of assisting the bicycle user and saving power.

[0064] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0065] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. An integrated hub motor suitable for an electric power-assisted bicycle, characterized in that: It comprises a flywheel assembly, a torque sensor assembly, and a motor assembly, wherein the torque sensor assembly comprises a rotor printed circuit board assembly (6) and a stator printed circuit board assembly (7), and the rotor printed circuit board assembly (6) and the stator printed circuit board assembly (7) are capable of interacting with each other; The motor assembly comprises a motor stator (9), a motor rotor (11) and a motor center shaft (12), wherein the motor stator (9) is nested on the motor center shaft (12), and the motor rotor (11) is rotatably mounted on the motor center shaft (12); The rotor printed circuit board assembly (6) is mounted on the flywheel assembly, the stator printed circuit board assembly (7) is mounted on the motor stator (9) and / or the motor center shaft (12), the flywheel assembly is mounted on the motor center shaft (12), and the flywheel assembly is respectively connected to the motor stator (9) and the motor rotor (11); The flywheel assembly comprises a first bearing (1), a flywheel (2), a flywheel cover (3), a second bearing (4), a flywheel mounting seat (5) and a third bearing (8); The flywheel (2) is mounted on the motor center shaft (12) via a first bearing (1); the flywheel mounting seat (5) is nested on the flywheel (2) and mounted on the motor center shaft (12) via a third bearing (8); and the flywheel cover (3) is connected to the flywheel mounting seat (5) via a second bearing (4); The flywheel cover (3) and the motor rotor (11) are connected to form a receiving space, and the torque sensor assembly and the motor stator (9) are located inside the receiving space; The flywheel (2) can be connected to a chain or pedal of an external electric power-assisted bicycle; The flywheel mounting seat (5) is provided with a convex block on the circumference, a spring (15) is provided inside the convex block, and a slot is provided on the circumference of the flywheel cover (3), the convex block is mounted in the slot and connected to the slot via the spring (15); The rotor printed circuit board assembly (6) comprises an inner rotor printed circuit board (6a) and an outer rotor printed circuit board (6b); The inner rotor printed circuit board (6a) and the outer rotor printed circuit board (6b) are concentric circular rings, and a plurality of groups of metal components are arranged on the circular end surfaces of the inner rotor printed circuit board (6a) and the outer rotor printed circuit board (6b), and the metal components include a plurality of metal blades (601); On the inner rotor printed circuit board (6a), the plurality of groups of metal components are evenly distributed relative to the center of the inner rotor printed circuit board (6a), and the plurality of metal blades (601) in one group of metal components are evenly distributed at intervals and radially distributed relative to the center of the inner rotor printed circuit board (6a); On the outer rotor printed circuit board (6b), the plurality of groups of metal components are evenly distributed relative to the center of the outer rotor printed circuit board (6b), and the plurality of metal blades (601) in one group of metal components are evenly distributed at intervals and radially distributed relative to the center of the outer rotor printed circuit board (6b); The stator printed circuit board assembly (7) comprises an outer receiving coil assembly (701), an inner receiving coil assembly (702), an excitation coil (703), a signal processing module (704) and a circuit board body; The circuit board body is annular, and the outer receiving coil component (701), the inner receiving coil component (702), the excitation coil (703) and the signal processing module (704) are all arranged on the circuit board body; the outer receiving coil component (701), the inner receiving coil component (702) and the excitation coil (703) are all connected to the signal processing module (704); the inner receiving coil component (702) is located on the inner side of the outer receiving coil component (701); and the excitation coil (703) is vertically mapped on the circuit board body to surround the inner receiving coil component (702) and the outer receiving coil component (701).

2. The integrated hub motor for an electric power-assisted bicycle according to claim 1, characterized in that: There is a gap between the protrusion and the slot.

3. The integrated hub motor for an electric power-assisted bicycle according to claim 1, characterized in that: The inner rotor printed circuit board (6a) is mounted on the inner end surface (14b) of the flywheel mounting seat, and the outer rotor printed circuit board (6b) is mounted on the end surface (13) of the flywheel cover.

4. The integrated hub motor for an electric power-assisted bicycle according to claim 3, characterized in that: The plane where the end surface (13) of the flywheel cover is located is higher than the plane where the protruding block end surface (14a) of the flywheel mounting seat is located.

5. The integrated hub motor for an electric power-assisted bicycle according to claim 1, characterized in that: The radiation angle of a group of metal components on the outer rotor printed circuit board (6b) is equal to the radiation angle of a group of metal components on the inner rotor printed circuit board (6a).

6. The integrated hub motor for an electric power-assisted bicycle according to claim 1, characterized in that: The shape and size of the vertical mapping plane of the external receiving coil assembly (701) are the same as those of the outer rotor printed circuit board (6b) of the rotor printed circuit board assembly (6), and can be vertically mapped onto the outer rotor printed circuit board (6b) of the rotor printed circuit board assembly (6); The shape and size of the vertical mapping plane of the inner receiving coil assembly (702) are the same as those of the inner rotor printed circuit board (6a) of the rotor printed circuit board assembly (6) and can be vertically mapped onto the inner rotor printed circuit board (6a) of the rotor printed circuit board assembly (6).

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