A wheel hub motor with a rotary encoder

Abstract

The application discloses a hub motor with a rotary encoder, which comprises a disc brake assembly, a flat fork assembly, a hub motor and a motor shaft, the disc brake assembly comprises a disc brake cover, a disc brake disc, a disc brake pump and a disc brake support, further comprises an encoder assembly, the disc brake assembly further comprises an insert shaft, the insert shaft is connected with the encoder assembly, the flat fork assembly comprises a first flat fork support, a second flat fork support and a damping support, the hub motor is an outer rotor motor, and the axis of the insert shaft coincides with the axis of the disc brake cover. When the motor collects rotor information by using a Hall element, the Hall element is poor in temperature characteristics, high temperature is generated in the motor when the motor operates under a large load, and the Hall element is prone to be damaged. The encoder assembly is used for collecting the position, angle and speed of the rotor of the motor, the built-in Hall element of the traditional motor is replaced, the position information precision is improved, and the service life of the motor is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wheel hub, in particular to a wheel hub motor with rotary encoder. BACKGROUND

[0002] When the Hall element collects rotor information for the motor, the Hall element is easily damaged due to poor temperature characteristics of the Hall element, high temperature generated inside the motor when the motor is running under heavy load, and the like, which affects the use precision and sensitivity of the Hall element, damages the output signal of the Hall element, and further affects the control precision of the controller on the motor, the operation characteristics of the motor, and the comfort of the whole vehicle. High temperature can even directly cause irreparable damage to the Hall element, affecting the service life of the motor. In addition, when using a high-power high-speed motor, the induced electromotive force generated by the winding coil inside the motor greatly affects the collection of the position information of the permanent magnet rotor by the Hall element, directly causing rotor position distortion, and the controller cannot accurately control the commutation of the motor, causing the motor to stop working directly. Finally, the Hall element is installed in the Hall slot of the stator core inside the motor, which is easily mechanically damaged during installation, affecting its service life. Therefore, improvement is needed. SUMMARY

[0003] The present application provides a new wheel hub motor with rotary encoder to solve the problem of easy damage of the Hall element in the prior art.

[0004] To solve the above technical problems, the present application realizes the following technical scheme:

[0005] A wheel hub motor with rotary encoder, comprising a disc brake assembly, a flat fork assembly, a wheel hub motor, and a motor shaft, the disc brake assembly comprising a disc brake cover, a disc brake disc, a disc brake pump, and a disc brake support, further comprising an encoder assembly, the motor shaft being rotatably connected with the disc brake assembly, the disc brake assembly further comprising an insert shaft, the insert shaft being connected with the encoder assembly, the flat fork assembly comprising a first flat fork support, a second flat fork support, and a damping support, the disc brake support being connected with the first flat fork support, the disc brake pump being matched with the disc brake disc, the wheel hub motor being an outer rotor motor, the motor shaft being fixedly connected with the second flat fork support, the insert shaft being fixedly connected with the disc brake cover, and the shaft center of the insert shaft coinciding with the shaft center of the disc brake cover.

[0006] When the motor rotor information is collected by the Hall element, the Hall element is easily damaged due to the poor temperature characteristics of the Hall element and the high temperature generated in the motor under heavy load. The position, angle, speed and other information of the motor rotor are collected by the encoder assembly to replace the built-in Hall element of the traditional motor, which improves the position information accuracy and the service life of the motor. The hub motor is an outer rotor motor, the motor shaft is fixed on the second flat fork support, the hub motor and the controller are powered on, the hub motor drives the hub and the disc brake cover to rotate when the hub motor operates, the disc brake cover drives the insert shaft to rotate, the insert shaft is connected with the encoder assembly, so that the controller collects the position signal of the magnetic encoder assembly and obtains the position information of the hub motor rotor. The axis of the insert shaft coincides with the axis of the disc brake cover, so that the insert shaft can be directly connected with the encoder assembly for measurement without additional conversion.

[0007] As a preferred, the hub motor with a rotary encoder, the motor shaft and the disc brake cover are rotatably connected by bearings.

[0008] This technical feature can make the motor shaft and the disc brake cover as a whole, ensure the stability and centring of the motor shaft, avoid the vibration and deviation of the motor shaft during operation, and improve the operation efficiency and service life of the motor.

[0009] As a preferred, the hub motor with a rotary encoder, the motor shaft and the insert shaft are rotatably connected by bearings.

[0010] Such design can make the relative motion between the motor shaft and the insert shaft more stable, reduce wear and noise, and prolong the service life of the motor.

[0011] As a preferred, the hub motor with a rotary encoder, the first flat fork support is provided with a first cavity and a second cavity, the first cavity is in communication with the second cavity, the first cavity is provided with a connecting bearing and an inner retainer ring inside, the encoder assembly is arranged in the second cavity, the insert shaft passes through the first cavity and finally extends into the second cavity to be connected with the encoder assembly, and the insert shaft is connected with the connecting bearing in the first cavity.

[0012] The first cavity and the second cavity provide a relatively closed space for the connection of the first shaft and the second shaft, ensuring the stability of the connection and avoiding external interference.

[0013] As a preferred, the hub motor with a rotary encoder, the insert shaft is provided with a protruding support body.

[0014] The insert shaft provided with the protruding support body can make the connection between the insert shaft and the disc brake cover more stable.

[0015] As preferred, the hub motor with rotary encoder as described above, the connecting bearing and the encoder assembly are provided with a nut, the nut is threadedly connected with the insert shaft, and the nut is respectively abutted with the connecting bearing and the encoder assembly.

[0016] The nut is provided for limiting the axial movement of the insert shaft.

[0017] As preferred, the hub motor with rotary encoder as described above, the second cavity is provided with a detachable cover plate on the outer side.

[0018] The second cavity is provided with a detachable cover plate on the outer side, so that the encoder assembly can be easily disassembled and maintained.

[0019] As preferred, the hub motor with rotary encoder as described above, the encoder assembly is a rotary transformer assembly or a magnetic encoder assembly. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 for the explosion Figure 1 of the present invention

[0021] Figure 2 for the explosion Figure 2 of the present invention

[0022] Figure 3 for the cross-sectional view of the motor shaft and the disc brake cover rotating connection of the present invention

[0023] Figure 4 for Figure 3 the enlarged view of A in FIG. 1

[0024] Figure 5 for the cross-sectional view of the disc brake cover and the insert shaft connection when the motor shaft and the disc brake cover are rotatingly connected

[0025] Figure 6 for the cross-sectional view of the disc brake cover and the insert shaft connection when the motor shaft and the insert shaft are rotatingly connected DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but they are not limitations of the present invention: Figures 1-6 Example 1

[0027]

[0028] ​A hub motor with a rotary encoder, comprising a disc brake assembly 1, a fork assembly 2, a hub motor, a motor shaft 3, the disc brake assembly 1 comprising a disc brake cover 11, a disc brake disc 13, a disc brake pump 14, a disc brake support 15, further comprising an encoder assembly 4, the motor shaft 3 being rotationally connected with the disc brake assembly 1, the disc brake assembly 1 further comprising an insert shaft 12, the insert shaft 12 connecting the encoder assembly 4, the fork assembly 2 comprising a first fork support 21, a second fork support 22, a shock absorbing support 23, the disc brake support 15 being connected with the first fork support 21, the disc brake pump 14 cooperating with the disc brake disc 13, the hub motor being an outer rotor motor, the motor shaft 3 being fixedly connected with the second fork support 22, the insert shaft 12 being fixedly connected with the disc brake cover 11, the axis of the insert shaft 12 coinciding with the axis of the disc brake cover 11.

[0029] Preferably, the motor shaft 3 is rotationally connected with the disc brake cover 11 by means of a bearing.

[0030] Preferably, the first fork support 21 is provided with a first cavity 211 and a second cavity 212, the first cavity 211 being in communication with the second cavity 212, the first cavity 211 being internally provided with a connecting bearing 213 and an inner retainer 214, the encoder assembly 4 being placed in the second cavity 212, the insert shaft 12 passing through the first cavity 211 and finally extending into the second cavity 212 to be connected with the encoder assembly 4, the insert shaft 12 being connected with the connecting bearing 213 in the first cavity 211.

[0031] Preferably, the insert shaft 12 is provided with a protruding support 121.

[0032] Preferably, a nut 5 is provided between the connecting bearing 213 and the encoder assembly 4, the nut 5 being threadedly connected with the insert shaft 12, the nut 5 being in abutment with the connecting bearing 213 and the encoder assembly 4 on both sides.

[0033] Preferably, the second cavity 212 is provided with a detachable cover plate 217 on the outer side.

[0034] Preferably, the encoder assembly 4 is a rotary transformer assembly or a magnetic encoder assembly.

[0035] Specifically, in use, the hub motor and the controller are powered on, the hub motor drives the hub and the disc brake cover 11 to rotate when the hub motor is running, the disc brake cover 11 drives the insert shaft 12 to rotate, the insert shaft 12 is connected with the encoder assembly 4, so that the controller obtains the position information of the rotor of the hub motor by collecting the position signal of the encoder assembly 4.

[0036] Embodiment 2

[0037] A hub motor with a rotary encoder, comprising a disc brake assembly 1, a fork assembly 2, a hub motor, a motor shaft 3, the disc brake assembly 1 comprising a disc brake cover 11, a disc brake disc 13, a disc brake pump 14, a disc brake support 15, further comprising an encoder assembly 4, the motor shaft 3 being rotationally connected with the disc brake assembly 1, the disc brake assembly 1 further comprising an insert shaft 12, the insert shaft 12 connecting the encoder assembly 4, the fork assembly 2 comprising a first fork support 21, a second fork support 22, a damping support 23, the disc brake support 15 being connected with the first fork support 21, the disc brake pump 14 cooperating with the disc brake disc 13, the hub motor being an outer rotor motor, the motor shaft 3 being fixedly connected with the second fork support 22, the insert shaft 12 being fixedly connected with the disc brake cover 11, the axis of the insert shaft 12 coinciding with the axis of the disc brake cover 11.

[0038] Preferably, the motor shaft 3 is rotationally connected with the insert shaft 12 by means of a bearing.

[0039] Preferably, the first fork support 21 is provided with a first cavity 211 and a second cavity 212, the first cavity 211 being in communication with the second cavity 212, the first cavity 211 being internally provided with a connecting bearing 213 and an inner retainer 214, the encoder assembly 4 being placed in the second cavity 212, the insert shaft 12 passing through the first cavity 211 and finally extending into the second cavity 212 to be connected with the encoder assembly 4, the insert shaft 12 being connected with the connecting bearing 213 in the first cavity 211.

[0040] Preferably, the insert shaft 12 is provided with a protruding support 121.

[0041] Preferably, a nut 5 is provided between the connecting bearing 213 and the encoder assembly 4, the nut 5 being threadedly connected with the insert shaft 12, the nut 5 being in abutment with the connecting bearing 213 and the encoder assembly 4 on both sides.

[0042] Preferably, the second cavity 212 is provided with a detachable cover plate 217 on the outer side.

[0043] Preferably, the encoder assembly 4 is a rotary transformer assembly or a magnetic encoder assembly.

[0044] Specifically, in use, the hub motor and the controller are powered on, the hub motor drives the hub and the disc brake cover 11 to rotate when the hub motor is running, the disc brake cover 11 drives the insert shaft 12 to rotate, the insert shaft 12 is connected with the encoder assembly 4, so that the controller obtains the position information of the rotor of the hub motor by collecting the position signal of the encoder assembly 4.

[0045] In summary, the above-mentioned is only the preferred embodiment of the present application, any equivalent changes and modifications made in the scope of the present application should be included in the scope of the present application.

Claims

1. A wheel hub motor with a rotary encoder, comprising a disc brake assembly (1), a flat fork assembly (2), a wheel hub motor, a motor shaft (3), the disc brake assembly (1) comprising a disc brake cover (11), a disc brake disc (13), a disc brake pump (14), a disc brake support (15), characterized in that: Also include an encoder component (4), the motor shaft (3) and the disc brake assembly (1) is connected, the disc brake assembly (1) also includes an insert shaft (12), the insert shaft (12) is connected to the encoder component (4), the flat fork assembly (2) includes a first flat fork bracket (21), a second flat fork bracket (22), a shock bracket (23), the disc brake bracket (15) is connected with the first flat fork bracket (21), the disc brake pump (14) is matched with the disc brake (13), the hub motor is an outer rotor motor, the motor shaft (3) is fixedly connected with the second flat fork bracket (22), the insert shaft (12) is fixedly connected with the disc brake cover (11), the shaft center of the insert shaft (12) coincides with the shaft center of the disc brake cover (11); The first flat fork bracket (21) is provided with a first cavity (211) and a second cavity (212), the first cavity (211) is communicated with the second cavity (212), the first cavity (211) is provided with a connecting bearing (213) and an inner check ring (214) inside, the encoder component (4) is placed in the second cavity (212), the insert shaft (12) passes through the first cavity (211) and finally extends into the second cavity (212) and is connected with the encoder component (4), the insert shaft (12) is connected with the connecting bearing (213) in the first cavity (211); The motor shaft (3) is rotatably connected with the disc brake cover (11) by means of a bearing; The motor shaft (3) is rotatably connected with the insert shaft (12) by means of a bearing.

2. The in-wheel motor according to claim 1, characterized by: The insert shaft (12) is provided with a protruding support body (121).

3. The in-wheel motor according to claim 2, characterized by: A nut (5) is arranged between the connecting bearing (213) and the encoder component (4), the nut (5) is threadedly connected with the insert shaft (12), and the nut (5) is respectively abutted with the connecting bearing (213) and the encoder component (4) on both sides.

4. The in-wheel motor according to claim 3, characterized by: The second cavity (212) is provided with a detachable cover plate (217) on the outer side.

5. The in-wheel motor according to claim 4, characterized by: The encoder component (4) is a resolver component or a magnetic encoder component.

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