CN216904451U

CN216904451U - External rotor hub motor

Info

Publication number: CN216904451U
Application number: CN202123399838.7U
Authority: CN
Inventors: 洪从媛; 陈超; 马晓天
Original assignee: Nanjing Qingyan Yiwei New Energy Power Co ltd
Current assignee: Nanjing Qingyan Yiwei New Energy Power Co ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-07-05
Anticipated expiration: 2031-12-30

Abstract

The utility model discloses an outer rotor hub motor which comprises a rotor assembly, a stator assembly and a braking device, wherein the stator assembly can drive the rotor assembly to rotate; the stator assembly comprises a cylindrical stator and a hollow stator support connected with the cylindrical stator, the stator support is used for being connected with the rotor assembly, and two axial ends of the stator are open; the stator is coaxially arranged in the rotor; the braking device is positioned in the stator, one end of the braking device is connected with the rotor assembly, the other end of the braking device is connected with the stator assembly, and the braking device can enable the rotor assembly to stop rotating relative to the stator assembly. The outer rotor hub motor can dissipate heat of the braking device and the stator through air cooling, and fully guarantees the performance and safety of the outer rotor hub motor.

Description

External rotor hub motor

Technical Field

The utility model relates to the technical field of electric wheels, in particular to an outer rotor hub motor.

Background

The hub motor integrates power, transmission and braking devices into the hub, so that the structure of the electric vehicle chassis is greatly simplified, the freedom degree of the total layout of the whole vehicle and the design of the vehicle body model is increased, and the diversification and the serialization of products with the same chassis and different vehicle body models can be realized by separating the chassis bearing function and the vehicle body function, thereby shortening the development period of a new vehicle and reducing the development cost.

The hub motor is generally divided into an outer stator inner rotor hub motor and an outer rotor inner stator hub motor, wherein the outer stator inner rotor hub motor has the problems of large lamination thickness, large axial size and the like, and is not easy to integrate a driving motor into a wheel hub, so that the distributed direct driving of the wheel is difficult to realize. And because of the structural characteristics of the outer rotor and inner stator hub motor, a stator assembly, a braking device, a bearing seat and the like can be integrated into the hub motor, and the inner rotor hub motor has better utilization rate of the space in a hub compared with the outer stator and the inner rotor hub motor.

However, the utilization rate of the space in the hub of the external rotor hub motor is high, which means that no extra space is available inside the external rotor hub motor for heat dissipation. When the outer rotor hub motor works, on one hand, a stator assembly generates a large amount of heat, on the other hand, a braking device also generates a large amount of heat during braking, and the heat added by the stator assembly and the braking device is extremely remarkable, so that the outer rotor hub motor can be in a high-temperature state for a long time. The high heat not only causes the external rotor hub motor to be difficult to maintain performance for a long time, but also may cause the heat fading phenomenon of the braking device, and seriously affects the use safety of the external rotor hub motor.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art, the utility model provides an outer rotor hub motor, which has a structure improved, so that the higher space utilization rate in a hub is ensured, and the outer rotor hub motor has good heat dissipation performance.

The utility model discloses an outer rotor hub motor which comprises a rotor assembly, a stator assembly and a braking device, wherein the stator assembly can drive the rotor assembly to rotate, the rotor assembly comprises a cylindrical rotor and a hollow rotor bracket connected with the cylindrical rotor, the rotor bracket is used for being connected with the stator assembly, and two axial ends of the rotor are open; the stator assembly comprises a cylindrical stator and a hollow stator support connected with the cylindrical stator, the stator support is used for being connected with the rotor assembly, and two axial ends of the stator are open; the stator is coaxially disposed within the rotor; the braking device is positioned in the stator, one end of the braking device is connected with the rotor assembly, the other end of the braking device is connected with the stator assembly, and the braking device can enable the rotor assembly to stop rotating relative to the stator assembly.

In one embodiment, the outer rotor hub motor further comprises a first seal disposed between the rotor and the stator in a radial spacing, the first seal sealingly connecting the rotor and the stator.

In one embodiment, the stator comprises a stator shell and a stator coil arranged on the radial outer wall of the stator shell, and a cooling assembly is further arranged on the stator shell corresponding to the stator coil.

In one embodiment, the cooling assembly is a cooling flow channel disposed within the stator housing.

In one embodiment, the braking device comprises a brake disc component connected with a rotor assembly and a brake component connected with a stator assembly, the brake disc component comprises an annular friction part, the friction part is coaxial with the rotor, and the distance from the friction part to the axis of the rotor is smaller than the distance from the brake component to the axis of the rotor.

In one embodiment, the brake assembly is removably coupled to the stator assembly.

In one embodiment, the outer rotor hub motor further comprises a rotary transformer, wherein the rotary transformer comprises a rotary stator and a rotary rotor, the rotary stator is arranged on the stator assembly, the rotary rotor is arranged on the rotor assembly, and the rotary stator and the rotary rotor are both positioned on the axis of the rotor.

In one embodiment, the outer rotor hub motor further comprises a rotary transformer shielding component, one end of the rotary transformer shielding component is connected with the rotor assembly, the other end of the rotary transformer shielding component is connected with the stator assembly, and the rotary transformer shielding component seals the rotary transformer.

In one embodiment, the external rotor hub motor further comprises a high-voltage wiring component and a low-voltage wiring component which are arranged on the stator assembly, two ends of the high-voltage wiring component are respectively used for being connected with a high-voltage wiring in the external rotor hub motor and an external high-voltage wiring, and two ends of the low-voltage wiring component are respectively used for being connected with a low-voltage wiring in the external rotor hub motor and an external low-voltage wiring.

In one embodiment, the outer rotor hub motor further comprises a bearing seat, a bearing sleeve and a bearing which are coaxially arranged, the bearing seat is sleeved with the bearing, the bearing sleeve is sleeved on the bearing, one of the bearing seat and the bearing sleeve is arranged on the rotor, and the other one of the bearing seat and the bearing sleeve is arranged on the stator.

Advantageous effects

According to the outer rotor hub motor, the two axial ends of the rotor and the stator are opened, and the rotor support and the stator support are hollowed out, so that cold air outside the outer rotor hub motor can enter the inner part of the outer rotor hub motor from the opened ends and the hollowed-out parts to exchange heat, the temperature of the outer rotor hub motor is reduced as much as possible, a brake device can not generate heat fading any more, and the performance and the safety of the outer rotor hub motor are fully guaranteed.

Drawings

FIG. 1 is a schematic view of an outer rotor hub motor of the present invention in some embodiments;

FIG. 2 is a schematic view of a rotor assembly of an outer rotor hub motor according to some embodiments of the present invention;

FIG. 3 is a schematic view of a stator assembly of an outer rotor hub motor according to some embodiments of the present invention;

FIG. 4 is a cross-sectional view of an outer rotor hub motor of the present invention in some embodiments;

the motor comprises a rotor assembly 1, a stator assembly 2, a cooling water conveying assembly 3, a low-voltage wiring assembly 4, a high-voltage wiring assembly 5, a rotary transformer cover 6, a rotary transformer 7, a second sealing element 8, a rotor 10, a rotor support 11, a rotor magnet 12, a bearing sleeve 13, a brake disc assembly 14, a bearing 15, a first sealing element 16, a stator 20, a stator coil 21, a cooling assembly 22, a bearing seat 23, a brake assembly 24, a stator support 25 and a friction part 141.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1, fig. 1 shows a schematic view of the external rotor hub motor of the present invention, which includes a rotor assembly 1 and a stator assembly 2, wherein the stator assembly 2 is coaxially disposed in the rotor assembly 1 and can drive the rotor assembly 1 to rotate. The rotor assembly 1 is used to connect with a hub, and when the rotor assembly 1 is driven to rotate by the stator assembly 2, the hub is also driven to rotate.

Fig. 2 shows a schematic view of a rotor assembly 1 according to some embodiments of the present invention. The rotor assembly 1 includes a rotor 10, and the rotor 10 is configured in a cylindrical shape similar to the shape of a hub. The rotor 10 further comprises a rotor support 11 for supporting it. The rotor support 11 is also used for the rotational connection to the stator assembly 2. In order to secure the installation space in the rotor 10, the rotor holder 11 is generally installed at one axial end of the rotor 10 as shown in fig. 2. In the embodiment shown in fig. 2, both axial ends of the rotor 10 are open, and the rotor holder 11 is also hollowed out.

Referring to fig. 3, fig. 3 shows a schematic view of a stator assembly 2 in a partial embodiment of the present invention, the stator assembly 2 includes a cylindrical stator 20 and a hollow stator bracket 25 connected to the stator 20, and the stator bracket 25 is used for supporting the structure of the stator 20 and is used for being connected to the rotor assembly 1.

Referring to fig. 4, fig. 4 is a cross-sectional view of an outer rotor hub motor according to some embodiments of the present invention. In the embodiment shown in fig. 4, the outer rotor hub motor further comprises a braking device arranged inside the stator 20. In this embodiment, the braking device includes a brake disc assembly 14 and a brake assembly 24, the brake disc assembly 14 being attached to the rotor frame 11 and the brake assembly 24 being attached to the stator 20. The brake disc assembly 14 cooperates with the brake assembly 24 to stop rotation of the rotor 10 relative to the stator 20.

According to the outer rotor hub motor, the two axial ends of the rotor 10 and the stator 20 are open, and the rotor support 11 and the stator support 25 are hollowed out, so that cold air outside the outer rotor hub motor can enter the inner part of the outer rotor hub motor from the open ends and the hollowed-out parts to exchange heat, the temperature of the outer rotor hub motor is reduced as much as possible, a brake device can not generate heat fading any more, and the performance and the safety of the outer rotor hub motor are fully guaranteed.

It should be noted that, because the rotor 10 and the stator 20 of the external rotor hub motor of the present invention are both open, when air enters the internal of the external rotor hub motor for air cooling, water vapor, impurities, etc. in the external air also enter the internal of the external rotor hub motor. In order to prevent the performance of the rotor 10 and the stator 20 from being affected, resulting in a reduction in the life of the outer rotor hub motor, the outer rotor hub motor of the present invention preferably further includes a first seal 16 disposed in a radial interval between the rotor 10 and the stator 20 and sealing the interval, as shown in fig. 4.

Specifically, the rotor 10 includes a cylindrical rotor housing, the rotor magnet 12 is provided on the inner wall of the rotor housing in the radial direction, the stator 20 includes a cylindrical stator housing, and the stator coil 21 corresponding to the rotor magnet 12 is provided on the outer wall of the stator housing in the radial direction. The first seal 16 is provided in the gap between the rotor housing and the stator housing and located on both sides in the axial direction of the rotor magnet 12 and the stator coil 21, and the first seal 16 fills and seals the gap between the rotor housing and the stator housing. Therefore, after moisture, impurities and the like in the outside air enter the inside of the outer rotor hub motor, the moisture, the impurities and the like can be blocked by the first sealing element 16 without causing interference to the rotor magnet 12 and the stator coil 21, and the performance of the outer rotor hub motor is ensured. Specifically, in the embodiment shown in FIG. 4, the first seal 16 is an oil seal.

In order to enhance the heat dissipation capability of the external rotor hub motor of the present invention, in the embodiment shown in fig. 4, a cooling assembly 22 is further disposed in the stator housing, and the cooling assembly 22 is used for cooling the stator coil 21. It will be appreciated that the cooling assembly 22 has a variety of implementations. For example, in the embodiment shown in fig. 4, the cooling component 22 is a cooling flow channel, the stator assembly 2 further includes a cooling water delivery component 3 disposed on the stator housing, the cooling water delivery component 3 is communicated with the cooling flow channel, the cooling water delivery component 3 includes a water inlet and a water outlet, cooling water is input into the cooling flow channel through the water inlet of the cooling water delivery component 3, and flows out from the water outlet of the cooling water delivery component 3 after passing through the cooling flow channel, so as to achieve heat exchange and temperature reduction.

It will be appreciated that in the foregoing embodiments, the brake disc assembly 14 is connected to the rotor assembly 1 and the brake assembly 24 is connected to the stator assembly 2, but this does not mean that the brake disc assembly 14 and the brake assembly 24 are necessarily in corresponding relationship with the rotor assembly 1 and the stator assembly 2. In some embodiments, the brake disc assembly 14 may also be coupled to the stator assembly 2, while the brake assembly 24 is coupled to the rotor assembly 1.

Preferably, in some embodiments as shown in fig. 4, the brake disc assembly 14 is connected to the rotor support 11, the brake assembly 24 is connected to the radially inner wall of the stator 20, the brake disc assembly 14 has an annular friction portion 141, the friction portion 141 is coaxial with the rotor 10, the friction portion 141 is capable of cooperating with the brake assembly 24, and the distance from the friction portion 141 to the axis of the rotor 10 is smaller than the distance from the brake assembly 24 to the axis of the rotor 10. In this embodiment, the brake assembly 24 may be a brake caliper that mates with the friction 141. By arranging the braking device of the outer rotor hub motor in the manner, the internal space of the outer rotor hub motor can be fully utilized, and the brake disc assembly 14 and the brake assembly 24 do not generate too much obstruction to the internal air flow of the outer rotor hub motor, so that the air cooling and heat dissipation effects of the outer rotor hub motor can be ensured.

In some embodiments, the brake disc assembly 14 is secured to the rotor assembly 1 and the brake assembly 24 is removably attached to the stator assembly 2. With the arrangement, the brake disc assembly 14 and the brake assembly 24 can form a stable matching working relation, the braking performance of the braking device is ensured, and the braking device with the arrangement mode can make the assembling process of the external rotor hub motor of the utility model easier.

Specifically, in order to connect the rotor assembly 1 and the stator assembly 2 of the present invention, as shown in fig. 4, in some embodiments, the outer rotor hub motor further includes a bearing seat 23, a bearing sleeve 13, and a bearing 15, which are coaxially disposed, the bearing 15 is sleeved on the bearing seat 23, and the bearing sleeve 13 is sleeved on the bearing 15. One of the bearing housing 23 and the bearing sleeve 15 is provided on the rotor 10, and the other is provided on the stator 20. In this embodiment, the bearing block 23 is arranged on the stator carrier 25, while the bearing sleeve 15 is arranged on the rotor carrier 11.

Specifically, in the partial embodiment shown in fig. 4, the external rotor hub motor further includes a resolver 7. The resolver 7 is an electromagnetic sensor for measuring angular displacement and angular velocity. The rotary transformer 7 includes a rotary stator and a rotary rotor (not shown in the figure), the rotary stator is disposed on the stator assembly 2, the rotary rotor is disposed on the rotor assembly 1, and the rotary stator and the rotary rotor are both located on an axis of the rotor 10. In some embodiments, as shown in fig. 4, the resolver stator is mounted on a bearing housing 23 and the resolver rotor is mounted on a bearing sleeve 13. In this way, resolver 7 actually serves as a position sensor, rotation of resolver 7 is actually synchronized with rotation of the outer rotor hub motor, and the relative positional relationship between rotor 10 and stator 20 of the outer rotor hub motor can be indirectly determined from the output signal of resolver 7.

Preferably, the outer rotor in-wheel motor further comprises a rotary transformer shielding component, one end of the rotary transformer shielding component is connected with the rotor assembly 1, the other end of the rotary transformer shielding component is connected with the stator assembly 2, and the rotary transformer shielding component can seal the rotary transformer 7. Specifically, as shown in fig. 4, the rotary transformer shielding assembly includes a rotary transformer shielding cover 6 and a second sealing member 8, the rotary transformer shielding cover 6 is connected to the bearing seat 23, and the second sealing member 8 seals and connects the bearing sleeve 15 and the rotary transformer shielding cover 6, so that the rotary transformer 7 is enclosed among the rotary transformer shielding cover 6, the second sealing member 8, the bearing sleeve 15 and the bearing seat 23, and the rotary transformer 7 is prevented from being interfered by impurities and moisture during wind cooling.

Specifically, in some embodiments, the external rotor hub motor of the present invention further includes a high voltage wiring component 5 and a low voltage wiring component 4 disposed on the stator assembly, two ends of the high voltage wiring component 5 are respectively used for connecting with a high voltage wiring in the external rotor hub motor and an external high voltage wiring, and two ends of the low voltage wiring component 4 are respectively used for connecting with a low voltage wiring in the external rotor hub motor and an external low voltage wiring. In the embodiment shown in fig. 3, the high-voltage terminal assembly 5 and the low-voltage terminal assembly 4 are arranged on the axial side of the stator housing.

It is understood that the high voltage connection and the low voltage connection in the external rotor hub motor can be different according to the actual arrangement. Taking the foregoing embodiment as an example, the low-voltage wiring in the outer rotor hub motor includes the output terminal of the resolver 7, and the high-voltage wiring in the outer rotor hub motor includes the outgoing line of the stator coil 21.

In other embodiments, the stator coil 21 is further provided with a temperature sensor, and the temperature sensor is used for measuring the temperature of the stator coil 21 to know the operation condition of the motor and perform necessary protection. Then in this embodiment the low voltage connections in the outer rotor hub motor also comprise the output of the temperature sensor.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An external rotor hub motor is characterized by comprising a rotor assembly, a stator assembly and a braking device, wherein the stator assembly can drive the rotor assembly to rotate,

the rotor assembly comprises a cylindrical rotor and a hollow rotor bracket connected with the cylindrical rotor, the rotor bracket is used for being connected with the stator assembly, and two axial ends of the rotor are open;

the stator assembly comprises a cylindrical stator and a hollow stator support connected with the cylindrical stator, the stator support is used for being connected with the rotor assembly, and two axial ends of the stator are open; the stator is coaxially disposed within the rotor;

the braking device is positioned in the stator, one end of the braking device is connected with the rotor assembly, the other end of the braking device is connected with the stator assembly, and the braking device can enable the rotor assembly to stop rotating relative to the stator assembly.

2. The outer rotor in-wheel motor of claim 1, further comprising a first seal disposed between the radial spaces of the rotor and the stator, the first seal sealingly connecting the rotor and the stator.

3. The external rotor in-wheel motor of claim 1, wherein the stator includes a stator housing and a stator coil disposed on a radially outer wall of the stator housing, and the stator housing further includes a cooling assembly disposed thereon corresponding to the stator coil.

4. The external rotor in-wheel motor of claim 3, wherein the cooling assembly is a cooling channel disposed within the stator housing.

5. The external rotor in-wheel motor of claim 1, wherein the braking device comprises a brake disc assembly connected to the rotor assembly and a brake assembly connected to the stator assembly, the brake disc assembly comprising an annular friction portion, the friction portion being coaxial with the rotor, the distance of the friction portion to the axis of the rotor being less than the distance of the brake assembly to the axis of the rotor.

6. The external rotor in-wheel motor of claim 5, wherein the brake assembly is removably attached to the stator assembly.

7. The external rotor in-wheel motor of claim 1, further comprising a resolver stator and a resolver rotor, the resolver stator disposed on the stator assembly, the resolver rotor disposed on the rotor assembly, the resolver stator and the resolver rotor both located on an axis of the rotor.

8. The external rotor in-wheel motor of claim 7, further comprising a rotating and shielding component, wherein one end of the rotating and shielding component is connected with the rotor assembly, the other end of the rotating and shielding component is connected with the stator assembly, and the rotating and shielding component seals the rotary transformer.

9. The external rotor in-wheel motor of claim 1, further comprising a high voltage wiring component and a low voltage wiring component arranged on the stator assembly, wherein two ends of the high voltage wiring component are respectively used for being connected with a high voltage wiring in the external rotor in-wheel motor and an external high voltage wiring, and two ends of the low voltage wiring component are respectively used for being connected with a low voltage wiring in the external rotor in-wheel motor and an external low voltage wiring.

10. The external rotor in-wheel motor of claim 1, further comprising a bearing seat, a bearing sleeve and a bearing coaxially arranged, wherein the bearing is sleeved on the bearing seat, the bearing sleeve is sleeved on the bearing, one of the bearing seat and the bearing sleeve is arranged on the rotor, and the other is arranged on the stator.