Middle motor middle shaft structure of electric moped

Abstract

The utility model discloses a mid-motor middle shaft structure of an electric moped. The mid-motor middle shaft structure comprises a detection unit, wherein the detection unit comprises a plurality of strain gauges, a rotating assembly and a fixing assembly; the fixed assembly comprises a fixed power supply part, a fixed PCBA and a grating sensor, the fixed power supply part is configured to be powered on from the middle motor, and the fixed power supply part supplies power to the fixed PCBA and the grating sensor; the fixing assembly is fixedly arranged relative to the middle motor. The rotating assembly comprises a rotating power supply part, a rotating PCBA and a grating. The rotating power supply part supplies power to the rotating PCBA. The grating sensor is used for detecting grating signals; the rotating assembly is fixedly arranged relative to the middle shaft; the rotary PCBA is configured to collect the torsional strain of the strain gauge; the rotary power supply component wirelessly supplies power to the fixed power supply component; the fixed PCBA is in wireless communication transmission with the rotary PCBA; and the fixed PCBA is used for signal transmission with the middle motor. And high integration can be realized in a limited space.

Description

Technical Field

[0001] The utility model belongs to the technical field of riding equipment, and specifically relates to a central motor shaft structure of an electric power-assisted bicycle. Background Art

[0002] The mid-mounted motor is the driving motor of an electric power-assisted bicycle. It is installed in the middle of the vehicle body, that is, at the pedal position. The motor is connected to the vehicle body and connected to the wheel of the bicycle through the chainring and rack to transmit power. The middle shaft structure, as the output and input component of the mid-mounted motor, carries the task of transmitting power with large torque. It can realize the outward power output of the motor in the fully automatic riding mode and the power-assisted riding mode, and can also realize the power transmission from the crank to the chainring in the human riding mode.

[0003] In the design of a mid-mounted motor torque shaft based on the strain gauge principle, due to space limitations, strain and cadence detection are difficult to achieve high integration, resulting in a complex structure and limited performance.

[0004] Therefore, it is necessary to develop a mid-mounted motor axle structure for electric assisted bicycles that can achieve high integration within a limited space, integrate strain and cadence detection functions, reduce the number of components, simplify the structure, and improve overall performance, which is a technical problem that needs to be solved urgently. Utility Model Content

[0005] The utility model aims to provide a mid-motor center shaft structure for an electric power-assisted bicycle, so as to solve the problems existing in the prior art that strain and pedaling frequency detection are difficult to achieve high integration, resulting in complex structure, etc.

[0006] In order to achieve the above-mentioned utility model purpose, the utility model adopts the following technical solutions:

[0007] The utility model proposes a central motor shaft structure of an electric power-assisted bicycle, comprising:

[0008] Central axis;

[0009] A detection unit, comprising a plurality of strain gauges, a rotating assembly and a fixed assembly; the strain gauges are used to detect the torsional strain of the central shaft;

[0010] The fixed component includes a fixed power supply component, a fixed PCBA and a grating sensor, wherein the fixed power supply component is configured to obtain power from the central motor, and the fixed power supply component supplies power to the fixed PCBA and the grating sensor; the fixed component is fixedly arranged relative to the central motor;

[0011] The rotating assembly includes a rotating power supply component, a rotating PCBA and a grating, wherein the rotating power supply component supplies power to the rotating PCBA; the grating sensor is used to detect the grating signal; the rotating assembly is fixedly arranged relative to the central axis; the rotating PCBA is configured to collect the torsional strain of the strain gauge;

[0012] The rotating power supply component and the fixed power supply component supply power wirelessly;

[0013] The fixed PCBA communicates with the rotating PCBA wirelessly; the fixed PCBA is used for signal transmission with the central motor.

[0014] In some embodiments of the present application, the fixing assembly further includes a fixing bracket, the fixing PCBA and the fixing power supply component are connected to the fixing bracket, and the fixing bracket is used to be arranged on the central motor.

[0015] In some embodiments of the present application, the rotating assembly further includes a rotating bracket, the rotating PCBA and the rotating power supply component are connected to the rotating bracket, and the rotating bracket is used to be arranged on the central axis.

[0016] In some embodiments of the present application, a first annular mounting groove is formed on the fixed bracket, and the fixed power supply component includes a fixed coil, which is installed in the first annular mounting groove; a second annular mounting groove is formed on the rotating bracket, and the rotating power supply component includes a rotating coil, which is installed in the second annular mounting groove; the fixed power supply component is configured to at least partially overlap with the projection area of ​​the rotating power supply component on a plane perpendicular to the axis of the central axis.

[0017] In some embodiments of the present application, the fixed coil is connected in the first annular mounting groove by low-pressure injection molding; or, the fixed coil is connected in the first annular mounting groove by glue potting.

[0018] In some embodiments of the present application, the rotating coil is connected in the second annular mounting groove by low-pressure injection molding; or, the rotating power supply component is connected in the second annular mounting groove by glue potting.

[0019] In some embodiments of the present application, the rotating bracket includes a rotating sleeve, and the fixed bracket is sleeved on the middle part of the rotating sleeve; the rotating power supply component is installed on the side of the first end of the rotating sleeve close to the fixed bracket; the fixed power supply component is installed on the side of the fixed bracket close to the rotating power supply component; the grating is arranged at the second end of the rotating sleeve, and the grating sensor is arranged on the side of the fixed bracket close to the grating.

[0020] In some embodiments of the present application, a plurality of strain gauge wire grooves are provided on one side of the rotating bracket close to the central axis, and cables pass through the strain gauge wire grooves for electrical connection between the strain gauge and the rotating PCBA.

[0021] In some embodiments of the present application, a rotating power supply component wire groove is provided on one side of the rotating bracket close to the central axis, and a cable passes through the rotating power supply component wire groove for the rotating power supply component to supply power to the rotating PCBA.

[0022] In some embodiments of the present application, a fixed power supply component threading hole is provided on the fixed bracket, and a cable passes through the fixed power supply component threading hole to supply power to the fixed power supply component and the fixed PCBA.

[0023] Compared with the prior art, the advantages and positive effects of the utility model are:

[0024] By connecting the strain gauge and the rotating component on the central shaft, and arranging the fixed component on the housing of the central motor, as the central shaft rotates relative to the central motor, the rotating component rotates relative to the fixed component;

[0025] The rotating component includes a rotating power supply component, a rotating PCBA and a grating, and the fixed component includes a fixed power supply component, a fixed PCBA and a grating sensor; the electromagnetic induction effect between the rotating power supply component and the fixed power supply component can realize wireless power supply from the fixed power supply component to the rotating power supply component; the fixed power supply component is used to power the fixed PCBA and the grating sensor, and the fixed PCBA receives the signal information of the grating sensor; the rotating power supply component is used to power the rotating PCBA, and the rotating PCBA receives the information of the strain gauge, and the rotating PCBA and the fixed PCBA transmit wireless signals, and the fixed PCBA receives the information and transmits it to the mid-mounted motor. In this way, the strain information and the pedaling frequency information are collected by adopting an integrated structure, wireless power supply and wireless signal transmission. The number of components is reduced, the structure is simplified, and the overall performance is improved.

[0026] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1It is a schematic diagram of the overall structure of an embodiment of the mid-mounted motor center shaft structure of the electric power-assisted bicycle proposed by the utility model;

[0029] Figure 2 It is another overall structural schematic diagram of an embodiment of the mid-mounted motor center shaft structure of the electric power-assisted bicycle proposed by the utility model;

[0030] Figure 3 It is a cross-sectional view of the central motor shaft structure of the electric power-assisted bicycle proposed by the utility model;

[0031] Figure 4 It is a schematic diagram of the overall structure of the rotating bracket of the central motor center shaft structure of the electric power-assisted bicycle proposed by the utility model;

[0032] Figure 5 It is a schematic diagram of the overall structure of the rotating bracket of the central motor center shaft structure of the electric power-assisted bicycle proposed by the utility model;

[0033] Figure 6 It is a top view of an embodiment of the central motor central shaft structure of the electric power-assisted bicycle proposed by the utility model;

[0034] Figure 7 It is an exploded schematic diagram of an embodiment of the central motor central shaft structure of the electric power-assisted bicycle proposed by the utility model;

[0035] Figure 8 It is a schematic diagram of the use of the central motor center shaft structure of the electric power-assisted bicycle proposed by the utility model;

[0036] In the figure,

[0037] 100, output gear;

[0038] 200, center axis;

[0039] 300, detection unit;

[0040] 310, rotating assembly;

[0041] 311, rotating power supply component;

[0042] 312, rotating PCBA;

[0043] 313, grating;

[0044] 314, rotating bracket;

[0045] 3141, strain gauge wire duct;

[0046] 3142, Wire guide for rotating power supply components;

[0047] 3143, second annular mounting groove;

[0048] 320, fixed assembly;

[0049] 321, fixed power supply components;

[0050] 322, fix the PCBA;

[0051] 3221, fixed PCBA data interface;

[0052] 323, grating sensor;

[0053] 324, fixed bracket;

[0054] 3241, first annular mounting groove;

[0055] 3242, mounting hole;

[0056] 3243, fixed power supply component threading hole. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0058] In the description of the present application, it should be understood that the terms "center", "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 device or element referred to 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.

[0059] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0060] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0061] In the present utility model, unless otherwise clearly stipulated and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0062] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0063] In some embodiments of the present application, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, the central motor shaft structure of the electric power-assisted bicycle is applied to the central motor of the electric power-assisted bicycle. The integrated component design is adopted to realize the function of strain and pedaling frequency detection in a limited space, and is easy to assemble and maintain.

[0064] In some embodiments of the present application, the mid-motor mid-axle structure includes a mid-axle 200 and a detection unit 300. The detection unit 300 is used to detect the pedaling frequency and strain of the mid-axle 200.

[0065] like Figure 1 , Figure 2 , Figure 3 As shown, the detection unit 300 includes a plurality of strain gauges, a rotating component 310 and a fixing component 320 .

[0066] like Figure 8 As shown, the rotating assembly 310 is disposed on the central shaft 200 .

[0067] The strain gauge is used to detect the torsional strain of the central axis 200. The strain gauge and the rotating assembly 310 both rotate with the central axis 200, and the rotating assembly 310 is electrically connected to the strain gauge to collect torsional strain information of the central axis 200. The electrical connection between the strain gauge and the rotating assembly 310 is achieved by connecting a cable.

[0068] The fixing assembly 320 is fixedly arranged on the middle motor. Specifically, the fixing assembly 320 is arranged on the housing of the middle motor.

[0069] When the user drives the central axis 200 to rotate by stepping on it, the rotating assembly 310 can be driven to rotate relative to the fixed assembly 320. When the rotating assembly 310 and the fixed assembly 320 rotate relative to each other, wireless power supply and wireless signal transmission are realized.

[0070] In some embodiments of the present application, the fixing assembly 320 includes a fixing power supply component 321 , a fixing PCBA 322 and a grating sensor 323 .

[0071] The rotating assembly 310 includes a rotating power supply component 311 , a rotating PCBA 312 , and a grating 313 .

[0072] The fixed power supply component 321 is connected to the power supply of the central motor. The electromagnetic induction effect between the fixed power supply component 321 and the rotating power supply component 311 is utilized to realize the fixed power supply component 321 to supply power to the rotating power supply component 311, thereby realizing wireless power supply in the detection unit 300.

[0073] The fixed power supply component 321 is configured to supply power to the fixed PCBA 322 .

[0074] The fixed PCBA 322 is configured to supply power to the grating sensor 323 .

[0075] The rotating power supply component 311 is configured to supply power to the rotating PCBA 312 .

[0076] The rotating PCBA 312 is configured to supply power to the strain gauges.

[0077] The grating sensor 323 is used to detect the rotation signal of the grating 313 .

[0078] The fixed PCBA 322 is used for wireless communication transmission with the rotating PCBA 312; the fixed PCBA 322 is used for signal transmission with the middle motor.

[0079] A fixed PCBA data interface 3221 is formed on the fixed PCBA 322 for electrically connecting to the main controller of the central motor for signal transmission.

[0080] Thus, wireless signal transmission between the fixed PCBA 322 and the rotating PCBA 312 and signal transmission between the detection unit 300 and the central motor are realized.

[0081] In some embodiments of the present application, the fixing assembly 320 further includes a fixing bracket 324. The fixing power supply component 321, the fixing PCBA 322 and the grating sensor 323 are connected to the housing of the central motor through the fixing bracket 324.

[0082] In some embodiments of the present application, the rotating assembly 310 further includes a rotating bracket 314. The rotating power supply component 311, the rotating PCBA 312 and the grating 313 are connected to the central axis 200 through the rotating bracket 314.

[0083] The grating 313 rotates with the rotating bracket 314 , and the grating sensor 323 is fixedly arranged on the fixed bracket 324 . The grating 313 and the grating sensor 323 rotate relative to each other through the relative rotation of the rotating bracket 314 with respect to the fixed bracket 324 , thereby realizing the detection of the pedaling frequency.

[0084] The grating sensor 323 is mounted on the fixed PCBA 322, so as to realize signal transmission between the two.

[0085] Thus, wireless power supply and wireless signal transmission can be realized by installing the rotating power supply component 311, rotating PCBA 312 and grating 313 on the rotating bracket 314, and by installing the fixed power supply component 321, fixed PCBA 322 and grating sensor 323 on the fixed bracket 324, and the function of pedaling frequency detection is integrated, and several strain gauges are connected to the middle shaft 200, and the torsional strain of the middle shaft 200 is detected and transmitted to the rotating PCBA 312, so as to realize the collection of strain information, and then use the strain principle to measure the torque of the middle shaft 200. Thus, an integrated component design is realized, the function of strain and pedaling frequency detection is realized in a limited space, and it is easy to assemble and maintain.

[0086] In some embodiments of the present application, in order to better realize wireless power supply, it is necessary to ensure that the distance between the fixed power supply component 321 and the rotating power supply component 311 is within a reasonable range, and to ensure that there is a certain effective working distance between the two.

[0087] In some embodiments of the present application, the distance between the fixed power supply component 321 and the rotating power supply component 311 is not less than 1 mm and not more than 5 mm, so as to achieve a wireless power supply effect between the fixed power supply component 321 and the rotating power supply component 311.

[0088] In order to better achieve the wireless power supply effect between the fixed power supply component 321 and the rotating power supply component 311, the distance between the fixed power supply component 321 and the rotating power supply component 311 is not less than 2 mm and not more than 4 mm.

[0089] In some embodiments of the present application, Figure 3 As shown, in order to facilitate the fixed power supply component 321 to be more conveniently and stably connected to the fixed bracket 324, a first annular installation groove 3241 is formed on the fixed bracket 324. The fixed power supply component 321 is installed in the first annular installation groove 3241.

[0090] Specifically, the fixed power supply component 321 is connected in the first annular mounting groove 3241 by low-pressure injection molding.

[0091] Specifically, the fixed power supply component 321 may also be connected in the first annular mounting groove 3241 by glue potting.

[0092] In some embodiments of the present application, Figure 3 As shown, in order to facilitate the rotation power supply component 311 to be more conveniently and stably connected to the rotation bracket 314, a second annular installation groove 3143 is formed on the rotation bracket 314. The rotation power supply component 311 is installed in the second annular installation groove 3143.

[0093] Specifically, the rotating power supply component 311 is connected in the second annular mounting groove 3143 by low-pressure injection molding.

[0094] Specifically, the rotating power supply component 311 can also be connected to the second annular mounting groove 3143 by glue potting.

[0095] The fixed power supply member 321 is configured to at least partially overlap with a projection area of ​​the rotating power supply member 311 on a plane perpendicular to the axis of the central shaft.

[0096] In some embodiments of the present application, in order to achieve compact installation of the above functional components, the rotating bracket 314 includes a rotating sleeve, and the fixed bracket 324 is sleeved on the rotating sleeve, thereby achieving compact installation of the rotating bracket 314 and the fixed bracket 324.

[0097] Specifically, a mounting hole 3242 is defined at the center of the fixing bracket 324 .

[0098] The mounting hole 3242 is sleeved on the rotating sleeve. Since the fixed bracket 324 is arranged on the central motor housing, and the rotating bracket 314 is connected to the central axis 200, the relative position of the fixed bracket 324 and the rotating bracket 314 can be adjusted by the relative position of the central motor housing and the central axis 200.

[0099] Specifically, when the fixed bracket 324 is sleeved on the rotating sleeve, a gap is maintained between the mounting hole 3242 of the fixed bracket 324 and the rotating sleeve, and there is no interaction between the two.

[0100] Specifically, the fixed bracket 324 is sleeved on the middle position of the rotating sleeve.

[0101] When the fixed bracket 324 is sleeved on the rotating sleeve, the second annular installation groove 3143 is opened on the side of the first end of the rotating sleeve close to the fixed bracket 324, and the first annular installation groove 3241 is opened on the side of the fixed bracket 324 close to the rotating power supply component 311. The fixed power supply component 321 is installed in the first annular installation groove 3241. In this state, the rotating power supply component 311 is adjacent to the fixed power supply component 321, so as to facilitate wireless power supply between the two.

[0102] like Figure 1 , Figure 7 , Figure 8 As shown, a grating 313 is arranged at the second end of the rotating sleeve. A grating sensor 323 is arranged on one side of the fixed bracket 324 close to the grating 313. The grating sensor 323 is close to the grating 313 to detect the signal of the grating 313.

[0103] Since the grating sensor 323 is located on the fixed PCBA 322, the fixed PCBA 322 is installed on a side of the fixed bracket 324 close to the grating 313. The grating sensor 323 is located on a side of the fixed PCBA 322 close to the grating 313.

[0104] The rotating PCBA 312 is disposed at the second end of the rotating sleeve.

[0105] In this state, an integrated and compact arrangement of the above functions can be achieved.

[0106] In some embodiments of the present application, a fixed power supply component threading hole 3243 is opened on the fixed bracket 324, and the fixed power supply component threading hole 3243 is used for cables to pass through to achieve electrical connection between the fixed power supply component 321 and the fixed PCBA322, and is used to fix the PCBA322 to obtain power from the fixed power supply component 321.

[0107] In order to realize the electrical connection of the strain gauge in the embodiment of the present application, a plurality of strain gauge lead grooves 3141 are provided on one side of the rotating bracket 314 close to the central axis 200 , and the number of the plurality of strain gauge lead grooves 3141 is the same as the number of the plurality of strain gauges.

[0108] Specifically, a plurality of strain gauge wire grooves 3141 are arranged at intervals on the inner wall of the rotating sleeve.

[0109] Specifically, the strain gauge wire groove 3141 is set through the rotating sleeve along the length direction of the rotating sleeve.

[0110] The cable can pass through the strain gauge wire groove 3141, thereby achieving electrical connection between the strain gauge and the rotating PCBA 312, and transmission of the torsional strain of the central axis 200 between the two.

[0111] A rotating power supply component wire groove 3142 is provided on one side of the rotating bracket 314 close to the central axis 200 , and a cable passes through the rotating power supply component wire groove 3142 to supply power to the rotating PCBA 312 from the rotating power supply component 311 .

[0112] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims

1. A mid-motor center shaft structure for an electric power-assisted bicycle, characterized in that: include: Central axis; A detection unit, which includes a plurality of strain gauges, a rotating component and a fixed component; The strain gauge is used to detect the torsional strain of the central shaft; The fixed component includes a fixed power supply component, a fixed PCBA and a grating sensor, wherein the fixed power supply component is configured to obtain power from the central motor, and the fixed power supply component supplies power to the fixed PCBA and the grating sensor; the fixed component is fixedly arranged relative to the central motor; The rotating assembly includes a rotating power supply component, a rotating PCBA and a grating, wherein the rotating power supply component supplies power to the rotating PCBA; the grating sensor is used to detect the grating signal; the rotating assembly is fixedly arranged relative to the central axis; the rotating PCBA is configured to collect the torsional strain of the strain gauge; The rotating power supply component and the fixed power supply component supply power wirelessly; The fixed PCBA communicates with the rotating PCBA wirelessly; the fixed PCBA is used for signal transmission with the central motor.

2. The central motor shaft structure according to claim 1, characterized in that: The fixing assembly further includes a fixing bracket, the fixing PCBA and the fixing power supply component are connected to the fixing bracket, and the fixing bracket is used to be arranged on the central motor.

3. The central motor shaft structure according to claim 2, characterized in that: The rotating assembly further includes a rotating bracket, the rotating PCBA and the rotating power supply component are connected to the rotating bracket, and the rotating bracket is used to be arranged on the central axis.

4. The central motor center shaft structure according to claim 3, characterized in that: A first annular mounting groove is formed on the fixed bracket, and the fixed power supply component includes a fixed coil, and the fixed coil is installed in the first annular mounting groove; A second annular mounting groove is formed on the rotating bracket, and the rotating power supply component includes a rotating coil, and the rotating coil is installed in the second annular mounting groove; The fixed power supply component is configured to at least partially overlap with a projection area of ​​the rotating power supply component on a plane perpendicular to the axis of the central shaft.

5. The central motor shaft structure according to claim 4, characterized in that: The fixed coil is connected in the first annular installation groove by low-pressure injection molding; or, the fixed coil is connected in the first annular installation groove by glue potting.

6. The central motor center shaft structure according to claim 4, characterized in that: The rotating coil is connected in the second annular mounting groove by low-pressure injection molding; or, the rotating power supply component is connected in the second annular mounting groove by glue potting.

7. The central motor center shaft structure according to claim 3, characterized in that: The rotating bracket comprises a rotating sleeve, and the fixed bracket is sleeved on the middle part of the rotating sleeve; The rotating power supply component is installed on one side of the first end of the rotating sleeve close to the fixed bracket; The fixed power supply component is installed on a side of the fixed bracket close to the rotating power supply component; The grating is arranged at the second end of the rotating sleeve, and the grating sensor is arranged on a side of the fixing bracket close to the grating.

8. The central motor center shaft structure according to claim 3, characterized in that: A plurality of strain gauge lead grooves are provided on one side of the rotating bracket close to the central axis, and cables pass through the strain gauge lead grooves for electrical connection between the strain gauge and the rotating PCBA.

9. The central motor center shaft structure according to claim 3, characterized in that: A rotating power supply component lead groove is provided on one side of the rotating bracket close to the central axis, and a cable passes through the rotating power supply component lead groove for the rotating power supply component to supply power to the rotating PCBA.

10. The central motor center shaft structure according to claim 2, characterized in that: The fixed bracket is provided with a fixed power supply component threading hole, and a cable passes through the fixed power supply component threading hole for powering the fixed power supply component and the fixed PCBA.

Images