CN217282396U

CN217282396U - Motor and electric skateboard applying same

Info

Publication number: CN217282396U
Application number: CN202221075496.5U
Authority: CN
Inventors: 肖鸿伟; 杜成顺; 施博; 纪元
Original assignee: Huayi Power Technology Dongguan Co ltd
Current assignee: Huayi Power Technology Dongguan Co ltd
Priority date: 2022-05-06
Filing date: 2022-05-06
Publication date: 2022-08-23
Anticipated expiration: 2032-05-06

Abstract

The utility model relates to an electric skateboard of motor and applied this motor. The motor comprises a stator component and a rotor component, wherein the rotor component can rotate relative to the stator component; the stator assembly comprises a first base, a supporting part extending out of the first base, a stator magnetic core fixedly sleeved on the supporting part, and a stator winding wound on the stator magnetic core; the rotor assembly comprises a rotating shaft, a cylindrical shell and a permanent magnet, the cylindrical shell comprises a circular wall and a second base connected to one end of the circular wall, the middle of the second bottom is fixedly connected with the rotating shaft, the circular wall surrounds the rotating shaft, and the permanent magnet is mounted on the inner wall of the circular wall; the open end of the annular wall faces the first base; the rotor assembly also includes a support ring mounted to the open end of the annular wall. The utility model discloses a rotor subassembly has set up the support ring to the bearing capacity of rotor subassembly has been strengthened.

Description

Motor and electric skateboard applying same

[ technical field ] A

The utility model relates to an electronic field, concretely relates to motor and applied electric skateboard of this motor.

[ background of the invention ]

The rotor of the outer rotor motor generally includes a cylindrical housing with an opening at one end, a rotating shaft fixedly connected with the bottom of the cylindrical housing, and a plurality of permanent magnets mounted on the inner wall of the cylindrical housing. Some external rotor motors have higher noise when working, and therefore, an improvement scheme is urgently needed.

[ Utility model ] content

An object of the utility model is to reduce the noise of external rotor electric machine.

Therefore, in a first aspect of the present invention, a motor is provided, which includes a stator assembly and a rotor assembly, wherein the stator assembly includes a first base, a supporting portion extending from the first base, a stator core fixedly sleeved on the supporting portion, and a stator winding wound around the stator core; the rotor assembly comprises a rotating shaft, a cylindrical shell and a permanent magnet, the cylindrical shell comprises a circular wall and a second base connected to one end of the circular wall, the middle of the second bottom is fixedly connected with the rotating shaft, the circular wall surrounds the rotating shaft, and the permanent magnet is mounted on the inner wall of the circular wall; the rotating shaft penetrates through the center of the supporting part along the length direction of the supporting part and is supported by the supporting part so that the rotor assembly can rotate relative to the stator assembly, and the open end of the annular wall faces the first base; the rotor assembly also includes a support ring mounted to the open end of the annular wall.

In one embodiment of the invention, the support ring is mounted to the inner wall of the open end of the ring wall.

In an embodiment of the invention, the support ring is in threaded connection with the inner wall of the open end of the ring wall.

In an embodiment of the invention, the support ring comprises an axial ring body and a collar formed at the periphery of the axial ring body, the axial ring body is mounted to the inner wall of the open end of the ring wall, and the collar is located outside the open end of the ring wall.

In an embodiment of the invention, the support ring is supported by the support part in a sliding manner or by rolling on bearings.

In one embodiment of the invention, the support ring is a one-piece integral body of metal material.

In one embodiment of the present invention, the support ring includes a first ring body and a second ring body, the second ring body being mounted to an inner side of the first ring body.

In an embodiment of the present invention, a first bearing and a second bearing are installed in the supporting portion, and the first bearing and the second bearing are separated by a preset distance along an axial direction of the supporting portion; the first and second bearings provide rolling support to the rotating shaft.

Further, in an embodiment of the present invention, the support device further includes a third bearing, and the third bearing sleeve is disposed on the support portion, and provides rolling support for the support ring.

Another object of the present invention is to reduce noise of the electric skateboard. Therefore, the utility model discloses a second aspect still provides an electric skateboard, the package rubbing board body and electronic round, electronic round includes the rim and the utility model discloses an electric skateboard motor that the first aspect provided, electric skateboard motor accepts in the rim, the tubular shell of rotor subassembly with rim fixed connection.

Compared with the prior art, the utility model discloses a rotor subassembly has set up the support ring to rotor subassembly's supporting capability has been strengthened.

[ description of the drawings ]

Fig. 1 is an overall schematic view of a motor according to an embodiment of the present invention;

fig. 2 is a sectional view of a motor according to embodiment 1 of the present invention;

FIG. 3 is a schematic view of a rotor assembly of the electric machine of FIG. 1;

fig. 4 is a cross-sectional view of a motor according to embodiment 2 of the present invention;

fig. 5 is a sectional view of a motor according to embodiment 3 of the present invention;

fig. 6 is a schematic view of an electric skateboard according to an embodiment of the present invention.

[ detailed description ] A

The invention is further described with reference to the following figures and examples.

Example 1

Referring to fig. 1 to 3, an electric machine 100 according to an embodiment of the present invention includes a stator assembly 1 and a rotor assembly 2. The stator assembly 1 includes a first base 11, a support portion 12 extending from the first base 11, a stator core 13 fixedly sleeved on the support portion, and a stator winding 14 wound around the stator core. The rotor assembly 2 includes a rotating shaft 21, a cylindrical housing 22, and a permanent magnet 23.

Specifically, the cylindrical housing 22 includes an annular wall 221 and a second base 222 connected to one end of the annular wall 221, the middle portion of the second base 222 is fixedly connected with the rotating shaft 21, the annular wall 221 surrounds the rotating shaft 21, and the permanent magnet 23 is mounted to the inner wall of the annular wall 21; the rotation shaft 21 passes through the center of the support portion 12 in the length direction of the support portion 12 and is supported by the support portion 12 such that the rotor assembly 2 can rotate relative to the stator assembly 1.

In this embodiment, the open end of the annular wall 221 faces the first base 11. It can be understood that the present embodiment is an external rotor motor, and the annular wall 221 is a position for direct support and force application, so that the improvement of the support capability of the annular wall 221 is the key for protecting the whole motor 100 and improving the whole support capability. Preferably, the rotor assembly 2 further includes a support ring 25 mounted to the open end of the circumferential wall 221, thereby enhancing a bearing capacity of the open end of the circumferential wall 221 and improving a supporting capacity and rigidity of the cylindrical housing 22 of the rotor, thereby reducing noise of the rotation of the motor. When the motor 100 operates, the stator magnetic core 13 forms corresponding stator poles under the action of the stator winding 14, the stator poles generate acting force on the permanent magnet 23 of the rotor assembly 2, and the permanent magnet 23 is transmitted to the rotating shaft 21 through the cylindrical shell 22 after being stressed. Because the utility model provides high cylindrical shell 22's bearing capacity and rigidity to cylindrical shell 22's deformation has been reduced or avoided, thereby motor 100's noise at work has been reduced. In the prior art, the strength of the cylindrical housing 22 is generally increased by increasing the thickness of the cylindrical housing 22, and the prior art increases the outer diameter of the cylindrical housing 22 or decreases the inner diameter of the cylindrical housing 22, thereby adversely affecting the size or performance of the motor; and the utility model discloses can need not increase tube-shape shell 22's thickness, can not increase tube-shape shell 22's external diameter or reduce, and the consumptive material cost is also low.

Specifically, the support ring 25 is mounted to the inner wall of the open end of the ring wall 221; thereby maintaining the overall volume of the motor 100 while increasing the supporting force. In the present embodiment, in order to fixedly connect the support ring 25 with the annular wall 221, the support ring 25 is screwed with the inner wall of the open end of the annular wall 221; the support ring 25 is prevented from separating from the ring wall 221 when the rotor assembly 2 is rotated relative to the stator assembly 1. In an alternative embodiment, the support ring 25 and the annular wall 221 are formed as a single piece, which reduces the assembly process and ensures a secure connection between the support ring 25 and the annular wall 221.

In the present embodiment, the support ring 25 includes an axial ring body 251 and a convex ring 252 formed on the outer periphery of the axial ring body 251, the axial ring body 251 is mounted to the inner wall of the open end of the ring wall 221, and the convex ring 252 is located outside the open end of the ring wall 221. It will be appreciated that the raised ring 252 acts as a stop when the axial ring body 251 is mounted to the inner wall of the open end of the annular wall 221. For example, when the protruding ring 252 abuts against the top end of the opening end of the annular wall 221, it means that the connection of the axial annular body 251 and the opening end of the annular wall 221 reaches the optimum connection and fixing state; at the same time, the convex ring 252 also increases the rigidity of the support ring 25, thereby increasing the support capability and rigidity of the cylindrical housing 22. Preferably, the outer diameter of the raised ring 252 is the same as the outer diameter of the open end of the annular wall 221. At this time, the protruding ring 252 is flush with the outer wall of the opening end of the annular wall 221, so as to prevent the supporting ring 25 from protruding outside the annular wall 221 and affecting the rotation of the rotor assembly after being mounted on the wheel body.

In this embodiment, in order to increase the supporting ability of the support ring 25, the support ring 25 is a one-piece integral structure formed by using a metal material. The integral or one-piece unitary body formed of a metallic material is more supportive than a spliced structure.

In the present embodiment, the rotating shaft 21 of the rotor assembly 2 is rotatably connected to the supporting portion 12 through a bearing, such that the second base 222, the annular wall 221 and the supporting ring 25 are supported by the supporting portion 12 through a bearing in a rolling manner. But the utility model is not limited to rolling support by the bearing; for example, the inner wall of the support portion 12 may be added with lubricating oil to directly support the rotating shaft 21 for sliding rotation, or support the rotating shaft 21 for sliding rotation by means of a bushing, so that the second seat 222, the annular wall 221 and the support ring 25 are slidably supported by the support portion 12.

Specifically, a first bearing 31 and a second bearing 32 are installed in the support portion 12, and the first bearing 31 and the second bearing 32 provide rolling support for the rotating shaft 21; and the first bearing 31 and the second bearing 32 are spaced apart by a preset distance in the axial direction of the support portion 12; the support is in an optimal state of balance. Preferably, the first bearing 31 is provided at the junction of the support portion 12 and the first base 11; the second bearing 32 is disposed at the top end of the support portion 12 near the second seat 222, thereby maximizing the support balance.

Example 2

Referring to fig. 4, the present embodiment is different from embodiment 1 shown in fig. 1 in that the support ring 25 includes a first ring 253 and a second ring 254, and the second ring 254 is mounted to the inside of the first ring 253. That is, two support rings for reinforcing the supporting ability of the rotor are added to the inner wall of the opening end of the annular wall 221, so that the supporting ability and rigidity of the cylindrical housing 22 are enhanced, and the noise is further reduced. In the present embodiment, the one-piece integral second ring 254 formed of a steel material having good rigidity is mounted to the inner side of the one-piece integral first ring 253 formed of an aluminum material having good toughness and resilience, and the test results show that such a structure in which the second ring 254 is mounted to the inner side of the first ring 253 is more strongly and better supported than the one-piece integral support ring 25 formed of a single steel material or the one-piece integral support ring 25 formed of a single aluminum material.

Example 3

Referring to fig. 5, the present embodiment is different in that, on the basis of the above embodiment 1 or embodiment 2, a third bearing 33 is further included, and the third bearing 33 is sleeved on the supporting portion 12 to provide rolling support for the supporting ring 25. In practical use, for a relatively large motor, the addition of the third bearing 33 sleeved to the support portion 12 and providing rolling support to the support ring 25 can further increase the bearing capacity and rigidity of the cylindrical housing 22, thereby further reducing noise. In one embodiment, the third bearing 33 is sleeved to the support portion 12 and connected to the inside of the support ring 25, thereby maximizing the supporting capability of the rotor assembly 2.

Example 4

Referring to fig. 6, an embodiment 4 of the present invention provides an electric skateboard 200, wherein the electric skateboard 200 includes a board body 50 and an electric wheel 150, the electric wheel 150 includes a rim and all the motors 100 of the

above embodiments

1, 2 and 3, the motors 100 are accommodated in the rim, and the cylindrical housing 22 of the rotor assembly 2 is fixedly connected to the rim. When riding the electric skateboard, the weight pressure of the board body and the rider is transmitted to the cylindrical shell 22 of the rotor assembly 2 through the wheel rim (refer to fig. 1), the support ring 25 (refer to fig. 2) is installed at the open end of the annular wall 221 of the cylindrical shell 22 in embodiment 1, the first ring body 253 is added on the inner wall of the open end of the annular wall 221 in embodiment 2, the second ring body 254 is installed at the inner side of the first ring body 253 (refer to fig. 4), or the third bearing 33 is added on the support part 12 on the basis of

embodiment

1 or 2 in embodiment 3, and the support ring 25 is provided with rolling support (refer to fig. 5); the above-mentioned configuration can enhance the supporting capability and rigidity of the annular wall 221 of the cylindrical casing 22, avoid the problems of deformation or breakage of the electric wheel and the motor 100 therein, and reduce the operating noise of the motor 100, and the motor 100 is used in the electric skateboard 200, thereby reducing the noise of the electric skateboard 200.

The above examples only represent preferred embodiments of the present invention, which are described in more detail and detail, but are not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, such as combinations of different features in the various embodiments, which are within the scope of the present invention.

Claims

1. A motor comprises a stator assembly and a rotor assembly, and is characterized in that the stator assembly comprises a first base, a supporting part extending out of the first base, a stator magnetic core fixedly sleeved on the supporting part, and a stator winding wound on the stator magnetic core; the rotor assembly comprises a rotating shaft, a cylindrical shell and a permanent magnet, the cylindrical shell comprises a circular wall and a second base connected to one end of the circular wall, the middle of the second bottom is fixedly connected with the rotating shaft, the circular wall surrounds the rotating shaft, and the permanent magnet is mounted on the inner wall of the circular wall; the rotating shaft penetrates through the center of the supporting part along the length direction of the supporting part and is supported by the supporting part so that the rotor assembly can rotate relative to the stator assembly, and the open end of the annular wall faces the first base; the rotor assembly also includes a support ring mounted to the open end of the annular wall.

2. The electric machine of claim 1 wherein said support ring is mounted to an inner wall of an open end of said annular wall.

3. The electric machine of claim 1 wherein the support ring is threadably coupled to an inner wall of the open end of the ring wall.

4. The electric machine of claim 1 wherein the support ring includes an axial ring body mounted to an inner wall of the open end of the ring wall and a raised ring formed on an outer periphery of the axial ring body, the raised ring being located outwardly of the open end of the ring wall.

5. The motor according to claim 1, wherein the support ring is slidably supported by the support portion or rollingly supported by a bearing.

6. The electric machine of claim 1 wherein said support ring is a one-piece unitary body formed of a metallic material.

7. The electric machine of claim 1, wherein the support ring comprises a first ring and a second ring, the second ring mounted to an inner side of the first ring.

8. The motor of claim 1, wherein a first bearing and a second bearing are installed in the support part, the first bearing and the second bearing being spaced apart by a predetermined distance in an axial direction of the support part; the first and second bearings provide rolling support to the rotating shaft.

9. The electric machine of claim 8 further comprising a third bearing journaled to the support portion for providing rolling support to the support ring.

10. An electric skateboard comprising a deck and an electric wheel, characterized in that the electric wheel comprises a rim and an electric motor according to any one of claims 1 to 9, the electric motor being housed in the rim, and the cylindrical housing of the rotor assembly being fixedly connected to the rim.