Hub motor and electric bicycle

Abstract

The utility model provides a wheel hub motor and an electric bicycle, and relates to the technical field of motors, the wheel hub motor comprises a rotor, a stator and a motor outer cover, the rotor sleeves the outer side of the stator; at least one end of the magnetic conductive ring body in the first direction is provided with an assembling groove, and the assembling groove is arranged on the inner side of the magnetic conductive ring body in the radial direction. At least one of the motor outer covers is provided with an assembling protrusion, and the assembling protrusion extends in the first direction and is assembled in the assembling groove. According to the hub motor provided by the utility model, the motor outer cover is arranged on the assembling groove of the magnetic conductive ring main body, compared with the prior art that the motor outer cover is assembled on the inner side of the magnetic conductive ring main body, the distance between the motor outer cover and the stator is increased, and the sensor arranged on the stator does not need to be bent, so that the fault probability of the sensor can be effectively reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of motors, and in particular to a hub motor and an electric bicycle. Background Technology

[0002] In traditional hub motors, the magnetic coil in the hub is usually a thin-walled component, generally cylindrical. To facilitate mass production, the inner hole of the magnetic coil is usually "multi-purpose", serving as both a positioning hole for the stop and a hole for attaching the magnet.

[0003] The magnetic coil portion (the part in contact with the magnet) of the traditional hub motor is relatively thick (generally 6mm-7mm). The sensor mainly consists of a PCB board and a plug-in Hall sensor. The axial and radial distances of the pins of the plug-in Hall sensor are relatively small, which can lead to problems such as structural interference and insufficient electrical clearance. Therefore, in actual production, the sensor is usually bent towards the axis of the hub motor to avoid structural interference and small electrical clearance. However, this results in the entire plug-in Hall sensor pin breaking, causing the entire sensor to fail, or the insulation layer of the pin breaking, which poses a risk to the electrical safety of the sensor.

[0004] Furthermore, the "one hole for multiple uses" design ensures backward compatibility of the stop positioning accuracy, which is of paramount importance to rotary motors. Utility Model Content

[0005] The purpose of this invention is to provide a hub motor and an electric bicycle to alleviate the technical problem of sensor bending in hub motors, which leads to sensor damage.

[0006] This utility model provides a hub motor, including a rotor, a stator and a motor cover, wherein the rotor is sleeved on the outside of the stator; the rotor includes a motor hub and a magnetic ring body, wherein the motor hub is sleeved on the magnetic ring body;

[0007] An assembly groove is provided at least one end of the magnetic ring body in a first direction, and the assembly groove is located on the inner side of the magnetic ring body in the radial direction.

[0008] A motor cover is provided on each side of the rotor. The inner radial side of the motor cover is connected to the stator, and the outer radial side of the motor cover is connected to the rotor.

[0009] Furthermore, at least one mounting protrusion is provided on the outer cover of the motor, and the mounting protrusion extends along a first direction and is mounted in the mounting groove;

[0010] The first direction is the axial direction of the stator's spindle.

[0011] In an optional embodiment, an assembly groove is provided at each of the two ends of the magnetic ring body in the first direction; and an assembly protrusion is provided on each of the motor covers.

[0012] In an optional embodiment, the stator includes a stator core, a support frame, and a mandrel, wherein the support frame is disposed on the mandrel, and the stator core is disposed on the support frame;

[0013] The motor cover is fitted onto the spindle, and a bearing is provided between the motor cover and the spindle.

[0014] In an optional embodiment, a mounting cavity is formed between the motor outer cover and the stator core, a sensor is disposed on the stator core, and the sensor extends into the mounting cavity.

[0015] In an optional embodiment, the outer edge of the motor cover is provided with a downward protrusion extending away from the spindle, and the downward protrusion abuts against the magnetic ring body.

[0016] In an optional embodiment, a magnet is provided on the inner side of the magnetic ring body, and there is a gap between the magnet and the stator core.

[0017] In an optional embodiment, mounting holes are provided on both sides of the magnetic ring body in a first direction, and a plurality of mounting holes are evenly arranged along the circumference of the magnetic ring body.

[0018] The motor cover has through holes that correspond one-to-one with the mounting holes. Bolts are inserted into the through holes along the side of the motor cover away from the motor hub and screwed into the mounting holes.

[0019] This utility model provides a hub motor with an outer cover mounted on the mounting groove of the magnetic ring body. Compared with the prior art where the outer cover is mounted on the inner side of the magnetic ring body, the distance between the outer cover and the stator is increased, and the sensor installed on the stator does not need to be bent, which can effectively reduce the probability of sensor failure. Moreover, the installation positions of the outer cover and the magnet are different, and the accuracy of the motor appearance and the installation position of the magnet can be adjusted according to actual needs, avoiding the upward or downward compatibility of accuracy caused by "one hole for multiple uses", which leads to increased costs or affects product quality.

[0020] This utility model provides an electric bicycle, including the hub motor described in any of the foregoing embodiments.

[0021] Compared with the prior art, the electric bicycle provided by this utility model has the hub motor provided by this utility model, and thus has all the beneficial effects of the hub motor provided by this utility model. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the hub motor provided in an embodiment of the present utility model;

[0024] Figure 2 for Figure 1 The diagram shows the AA cross-sectional structure of the hub motor.

[0025] Figure 3 for Figure 2 The diagram shows a partial enlarged view of section B in the schematic diagram of the AA section structure of the hub motor.

[0026] Figure 4 for Figure 1 The diagram shows the structure of the rotor of the hub motor.

[0027] Figure 5 This is a schematic diagram illustrating the positional relationship between the motor hub and the sensor in existing technology.

[0028] Icons: 100-Rotor; 200-Motor outer cover; 300-Spindle; 201-Assembly protrusion; 202-Lower protrusion; 400-Magnetic ring body; 500-Motor hub; 600-Magnet; 700-Stator core; 800-Sensor; 900-Support frame; 110-Assembly slot; 120-Mounting hole. Detailed Implementation

[0029] The terms “first,” “second,” “third,” etc., are used only for distinguishing descriptions and do not indicate a sequence number, nor should they be interpreted as indicating or implying relative importance.

[0030] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this application, it should be noted that the terms "inner", "outer", "left", "right", "upper", "lower", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] In the description of this application, unless otherwise expressly specified and limited, the terms “set up,” “install,” “connect,” and “link” shall be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; as a mechanical connection or an electrical connection; as a direct connection or an indirect connection through an intermediate medium; or as a connection within two components.

[0033] The technical solution of this application will now be clearly and completely described with reference to the accompanying drawings.

[0034] Example

[0035] Reference Figures 1-4 This utility model provides a hub motor, including a rotor 100, a stator and a motor cover 200, wherein the rotor 100 is sleeved on the outside of the stator; the rotor 100 includes a motor hub 500 and a magnetic ring body 400, wherein the motor hub 500 is sleeved on the magnetic ring body 400.

[0036] An assembly groove 110 is provided at least one end of the magnetic ring body 400 in a first direction, and the assembly groove 110 is located on the inner side of the radial direction of the magnetic ring body 400.

[0037] A motor cover 200 is provided on each side of the rotor 100. The inner radial side of the motor cover 200 is connected to the stator, and the outer radial side of the motor cover 200 is connected to the rotor 100.

[0038] At least one mounting protrusion 201 is provided on the motor outer cover 200, and the mounting protrusion 201 extends along the first direction and is mounted in the mounting groove 110.

[0039] The first direction is the axial direction of the stator spindle 300.

[0040] In some embodiments, the rotor 100 of the hub motor is disposed outside the stator, and a magnetic ring body 400 is disposed inside the motor hub 500 of the rotor 100. The magnetic ring body 400 is used to mount the magnet 600. An assembly groove 110 is disposed on one side of the magnetic ring body 400 in a first direction. The assembly groove 110 is located on the radial inner side of the magnetic ring body 400. The assembly protrusion 201 of the motor cover 200 can be assembled into the assembly groove 110 of the magnetic ring body 400.

[0041] The inner side of the magnetic ring body 400 is used to install the magnet 600, and the mounting groove 110 is used to install the mounting protrusion 201 of the motor outer cover 200. Compared with the prior art, both the motor outer cover 200 and the magnet 600 are installed on the magnetic ring. The precision of the mounting groove 110 and the inner side of the magnetic ring body 400 can be adjusted according to actual needs. However, the prior art adopts the "one hole for multiple uses" method, and the precision needs to be compatible upward or downward, which leads to increased cost or affects product quality.

[0042] In an optional embodiment, each end of the magnetic ring body 400 in the first direction is provided with an assembly groove 110; and each of the motor outer covers 200 is provided with an assembly protrusion 201.

[0043] To facilitate production and installation of the motor cover 200, mounting grooves 110 are provided at both ends of the magnetic ring body 400, that is, mounting protrusions 201 are provided on both sides of the motor cover 200 of the magnetic ring body 400.

[0044] In an optional embodiment, the stator includes a stator core 700, a support frame 900, and a spindle 300, wherein the support frame 900 is disposed on the spindle 300, and the stator core 700 is disposed on the support frame 900.

[0045] The motor outer cover 200 is sleeved on the spindle 300, and a bearing is provided between the motor outer cover 200 and the spindle 300.

[0046] Reference Figure 3 and Figure 5 In an optional embodiment, a mounting cavity is formed between the motor outer cover 200 and the stator core 700, and a sensor 800 is provided on the stator core 700, with the sensor 800 extending into the mounting cavity.

[0047] In some embodiments, there is a certain gap between the motor cover 200 and the stator core 700, and the sensor 800 is disposed on the stator core 700. Since the mounting groove 110 is provided on the magnetic ring body 400, the motor cover 200 does not need to be mounted on the inner side of the magnetic ring body 400. The motor cover 200 is mounted in the mounting groove 110 by mounting protrusion 201. In this way, the distance between the motor cover 200 and the stator core 700 is increased. When the sensor 800 is installed on the stator core 700, the sensor 800 does not need to be bent, which effectively improves the service life of the sensor 800.

[0048] In an optional embodiment, the outer edge of the motor cover 200 is provided with a lower protrusion 202 extending away from the spindle 300, and the lower protrusion 202 abuts against the magnetic ring body 400.

[0049] To improve the accuracy of motor cover 200 installation, a lower protrusion 202 is also provided on motor cover 200. The extension direction of the lower protrusion 202 is generally set at a right angle to the extension direction of the assembly protrusion 201. During the process of the assembly protrusion 201 being inserted into the assembly groove 110, the lower protrusion 202 abuts against the magnetic ring body 400, thus avoiding the assembly protrusion 201 from being inserted into the assembly groove 110 too quickly.

[0050] In an optional embodiment, a magnet 600 is provided on the inner side of the magnetic ring body 400, and there is a gap between the magnet 600 and the stator core 700.

[0051] In an optional embodiment, mounting holes 120 are provided on both sides of the magnetic ring body 400 in a first direction, and a plurality of mounting holes 120 are evenly arranged along the circumference of the magnetic ring body 400.

[0052] The motor outer cover 200 is provided with through holes that correspond one-to-one with the mounting holes 120. Bolts are inserted into the through holes along the side of the motor outer cover 200 away from the motor hub 500 and screwed into the mounting holes 120.

[0053] In some embodiments, a magnet 600 is disposed on the inner side of the magnetic ring body 400, and the magnetic ring body 400 is sleeved on the stator core 700, with a gap between the stator core 700 and the magnet 600.

[0054] A support frame 900 is fitted onto the spindle 300, and the stator core 700 is circumferentially arranged on the outer side of the support frame 900. The motor cover 200 has through holes, and the motor hub 500 has mounting holes 120. Generally, multiple mounting holes 120 are evenly arranged along the circumference of the motor hub 500. The motor cover 200 is bolted through the mounting holes 120 and screwed into the mounting holes 120, thus realizing the connection between the motor cover 200 and the motor hub 500. The motor hub 500 is fitted onto the spindle 300, and there is a bearing between the spindle 300 and the motor hub 500. The motor hub 500 can rotate on the spindle 300, that is, the rotor 100 can rotate relative to the stator, and a fixed gap is maintained between the stator core 700 and the magnet 600.

[0055] This utility model provides a motor cover 200 for a hub motor, which is mounted on the assembly groove 110 of the magnetic ring body 400. Compared with the prior art where the motor cover 200 is assembled inside the magnetic ring body 400, the distance between the motor cover 200 and the stator is increased, and the sensor 800 installed on the stator does not need to be bent, which can effectively reduce the probability of sensor 800 failure. Moreover, the motor cover 200 and the magnet 600 are installed in different positions, and the accuracy of the motor appearance and the installation position of the magnet 600 can be adjusted according to actual needs, avoiding the need for "one hole for multiple uses" which leads to upward or downward compatibility of accuracy, resulting in increased costs or affecting product quality. The prior art generally adopts downward compatibility, sacrificing the assembly accuracy of the motor cover 200 to achieve fast and efficient mass production.

[0056] In this utility model, compared with the prior art, the thickness of the magnetic ring body 400 is reduced and the precision of the assembly groove 110 is higher. However, the axial dimension angle of the machining does not pose a burden on the overall mass production, but improves the overall assembly precision of the hub motor.

[0057] This hub motor can be applied to generators, automobile hubs, test bench hubs, and other scenarios.

[0058] This utility model provides an electric bicycle, including the hub motor described in any of the foregoing embodiments.

[0059] Compared with the prior art, the electric bicycle provided by this utility model has the hub motor provided by this utility model, and thus has all the beneficial effects of the hub motor provided by this utility model.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A hub motor, characterized in that, It includes a rotor (100), a stator and a motor cover (200), the rotor (100) being sleeved on the outside of the stator; the rotor (100) includes a motor hub (500) and a magnetic ring body (400), the motor hub (500) being sleeved on the magnetic ring body (400); An assembly groove (110) is provided at least one end of the magnetic ring body (400) in a first direction, and the assembly groove (110) is located on the inner side of the magnetic ring body (400) in the radial direction. A motor cover (200) is provided on each side of the rotor (100). The inner radial side of the motor cover (200) is connected to the stator, and the outer radial side of the motor cover (200) is connected to the rotor (100). At least one mounting protrusion (201) is provided on the motor cover (200), and the mounting protrusion (201) extends along a first direction and is mounted in the mounting groove (110); The first direction is the axial direction of the stator mandrel (300).

2. The hub motor according to claim 1, characterized in that, The magnetic ring body (400) has an assembly groove (110) at each end in the first direction; each of the motor outer covers (200) has an assembly protrusion (201).

3. The hub motor according to claim 2, characterized in that, The stator includes a stator core (700), a support frame (900), and a spindle (300). The support frame (900) is mounted on the spindle (300), and the stator core (700) is mounted on the support frame (900). The motor cover (200) is sleeved on the spindle (300), and a bearing is provided between the motor cover (200) and the spindle (300).

4. The hub motor according to claim 3, characterized in that, An installation cavity is formed between the motor outer cover (200) and the stator core (700). A sensor (800) is provided on the stator core (700) and the sensor (800) extends into the installation cavity.

5. The hub motor according to claim 1, characterized in that, The outer edge of the motor cover (200) is provided with a lower protrusion (202) extending away from the spindle (300), and the lower protrusion (202) abuts against the magnetic ring body (400).

6. The hub motor according to claim 3, characterized in that, A magnet (600) is provided on the inner side of the magnetic ring body (400), and there is a gap between the magnet (600) and the stator core (700).

7. The hub motor according to claim 3, characterized in that, Mounting holes (120) are provided on both sides of the magnetic ring body (400) in the first direction, and a plurality of mounting holes (120) are evenly arranged along the circumference of the magnetic ring body (400). The motor cover (200) has through holes that correspond one-to-one with the mounting holes (120). Bolts are inserted into the through holes along the side of the motor cover (200) away from the motor hub (500) and screwed into the mounting holes (120).

8. An electric bicycle, characterized in that, Includes the hub motor as described in any one of claims 1-7.

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