CN219980629U - Motor structure and electric tool with same - Google Patents

Abstract

The utility model discloses a motor structure and an electric tool with the motor structure, wherein the motor structure comprises: a stator assembly; an inner rotor assembly which is arranged on the inner side of the stator assembly and can rotate relative to the stator assembly; the outer rotor assembly is arranged on the outer side of the stator assembly and can rotate relative to the stator assembly; the stator assembly is provided with a first tooth part opposite to the inner rotor assembly and a second tooth part opposite to the outer rotor assembly, and the number of teeth of the first tooth part is different from the number of teeth of the second tooth part.

Description

Motor structure and electric tool with same

Technical Field

The utility model belongs to the technical field of electric tools, and particularly relates to a motor structure and an electric tool with the motor structure.

Background

Electric tools are used in many areas of life, for example, in finishing, automotive repair, and the like. The motor is a power source of the electric tool, and provides driving torque after being electrified so as to drive the electric tool to work. The motor comprises a stator assembly and a rotor assembly, the size and the performance of the motor have certain correlation, and in general, the better the performance of the motor is, the larger the size of the motor is, but the higher the performance requirement of the electric tool on the motor is, and meanwhile, the smaller the size of the motor is expected. This contradiction of demand has been in the art. Accordingly, there is a need for an improvement over the prior art to overcome the deficiencies described in the prior art.

Disclosure of Invention

Therefore, the technical problem to be solved by the utility model is to provide a motor structure and an electric tool with the motor structure.

In order to solve the above technical problems, the present utility model provides a motor structure, including: a stator assembly; an inner rotor assembly which is arranged on the inner side of the stator assembly and can rotate relative to the stator assembly; the outer rotor assembly is arranged on the outer side of the stator assembly and can rotate relative to the stator assembly; the stator assembly is provided with a first tooth part opposite to the inner rotor assembly and a second tooth part opposite to the outer rotor assembly, and the number of teeth of the first tooth part is different from the number of teeth of the second tooth part.

Preferably, in the motor structure, the number of teeth of the second tooth part is greater than the number of teeth of the first tooth part; wherein the number of teeth of the first tooth part is a multiple of 2, and the number of teeth of the second tooth part is a multiple of 2; or,

the number of teeth of the first tooth part is a multiple of 3, and the number of teeth of the second tooth part is a multiple of 3; or,

the number of teeth of the first tooth part is a multiple of 2, and the number of teeth of the second tooth part is a multiple of 3.

Preferably, in the motor structure, the number of teeth of the second tooth part is a multiple of the number of teeth of the first tooth part.

Preferably, in the motor structure, the number of teeth of the second tooth part is 12, and the number of teeth of the first tooth part is 6.

Preferably, in the motor structure, the second teeth and the first teeth are staggered in a circumferential direction of the stator assembly.

Preferably, in the motor structure, the stator assembly includes a stator core, the stator core includes a base ring, the first tooth portion provided on an inner ring of the base ring, and a second tooth portion provided on an outer ring of the base ring, and the first tooth portion and the second tooth portion are configured to wind around a set sub-line;

wherein the first teeth are circumferentially spaced apart from the base ring and radially spaced apart from the inner rotor assembly;

the second teeth are circumferentially spaced apart from the base ring and radially spaced apart from the outer rotor assembly.

Preferably, in the motor structure, an insulating member is further provided on the stator core, and the insulating member is configured to separate the stator wire from the stator core.

Preferably, in the motor structure, the insulating member includes a first stator end cover and a second stator end cover, and the first stator end cover and the second stator end cover are respectively sleeved on the stator core from two end sides of the stator core, where an end of the first stator end cover, which is close to the second stator end cover, abuts against an end of the second stator end cover, which is close to the first stator end cover, or is arranged at a certain distance; or the insulating piece is an insulating coating coated on the surface of the stator core; alternatively, the insulating member is insulating paper provided against the stator core.

Preferably, the motor structure further comprises: the shell seat is detachably connected with the stator assembly, and the stator assembly is fixed relative to the shell seat; a heat sink disposed within the motor structure, the heat sink configured to generate a heat dissipating airflow through the stator assembly, the inner rotor assembly, and the outer rotor assembly;

the shell seat and the heat dissipation piece are distributed on two end sides of the stator assembly.

The utility model also provides an electric tool which comprises the motor structure.

The technical scheme provided by the utility model has the following advantages: a stator assembly is matched with the inner rotor assembly and the outer rotor assembly simultaneously, and is equivalent to integrating two motors together, so that the performance of the motors can be greatly improved, and meanwhile, compared with the two motors, the occupied space of the motors is obviously reduced. The contradiction between the motor performance and the size requirement is reduced in a certain procedure. The number of teeth of the first tooth part is unequal to the number of teeth of the second tooth part, so that the requirements of an inner rotor component and an outer rotor component matched with the stator component can be better met, and the performance of the motor can be improved more possibly.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic perspective view of a motor structure provided by the utility model;

FIG. 2 is an exploded view of a motor structure according to the present utility model;

FIG. 3 is a schematic cross-sectional view of a motor structure according to the present utility model;

FIG. 4 is an exploded view of the stator assembly;

fig. 5 is a schematic structural view of a stator core;

FIG. 6 is a schematic view of the structure of the housing seat;

FIG. 7 is a schematic cross-sectional view of an outer rotor assembly and a heat sink;

fig. 8 is a schematic structural view of a heat sink.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. The utility model will be described in detail hereinafter with reference to the drawings in conjunction with embodiments. It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

In the present utility model, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present utility model.

Example 1

Referring to fig. 1 to 3, the present utility model provides a motor structure, which is a dual-rotor motor, comprising: stator assembly 100, inner rotor assembly 200, outer rotor assembly 300, housing base 500, and heat sink 400.

The housing seat 500 serves to support the stator assembly 100, the inner rotor assembly 200, and the outer rotor assembly 300. Specifically, the stator assembly 100 is fixedly supported on the housing base 500; the inner rotor assembly 200 and the outer rotor assembly 300 are rotatably supported on the housing base 500, i.e., the inner rotor assembly 200 and the outer rotor assembly 300 can rotate relative to the housing base 500.

The heat sink 400 serves to generate a heat-dissipating air flow through the stator assembly 100, the inner rotor assembly 200, and the outer rotor assembly 300, thereby preventing excessive heat from accumulating in the motor structure, and providing a good heat-dissipating effect.

The inner rotor assembly 200 is disposed on the inner side of the stator assembly 100, the outer rotor assembly 300 is disposed on the outer side of the stator assembly 100, and the inner rotor assembly 200 and the outer rotor assembly 300 can rotate relative to the stator assembly 100.

In this embodiment, the rotational axis of inner rotor assembly 200 is co-linear with the rotational axis of outer rotor assembly 300. The inner rotor assembly 200 is fixedly connected with the outer rotor assembly 300, and the inner rotor assembly 200 and the outer rotor assembly 300 synchronously rotate in the same direction and speed so as to drive the same load to rotate. The "load" is an actuator of the power tool.

After the inner rotor assembly 200 and the outer rotor assembly 300 are fixedly connected into a whole, the inner rotor assembly 200 and the outer rotor assembly 300 can obtain output with larger output torque when rotating, which is beneficial to reducing the appearance and the volume of the motor structure and realizing the miniaturization of the structure. That is, in the present embodiment, the stator assembly 100 is simultaneously matched with the inner rotor assembly 200 and the outer rotor assembly 300, and one motor of the present embodiment corresponds to one inner rotor motor and one outer rotor motor in the prior art, so that the performance of the motor is greatly improved, and meanwhile, the occupied space is significantly reduced compared with two motors. Therefore, the motor structure of the embodiment reduces the contradiction between the motor performance and the size requirement in the prior art to a certain extent.

Referring to fig. 4 and 5, the stator assembly 100 includes a stator core 110, and the stator core 110 includes a base ring 111, a first tooth portion 112 disposed on an inner ring of the base ring 111, and a second tooth portion 113 disposed on an outer ring of the base ring 111. Wherein the first tooth portion 112 and the second tooth portion 113 are configured to wind a set sub-wire, and the stator wire is an enamel wire.

The second teeth 113 and the first teeth 112 are staggered in the circumferential direction of the stator assembly 100 to facilitate winding. The first teeth 112 are internal teeth, and are distributed opposite to the inner rotor assembly 200; the second teeth 113 are external teeth, and are distributed opposite to the outer rotor assembly 300. The first teeth 112 are spaced apart in the circumferential direction of the base ring 111 and are spaced apart from the inner rotor assembly 200 in the radial direction. The second teeth 113 are circumferentially spaced apart from the base ring 111 and radially spaced apart from the outer rotor assembly 300. The first tooth portion 112 and the second tooth portion 113 are respectively arranged on the inner ring and the outer ring of the base ring 111, and the size of the whole motor structure can be reduced by reasonably utilizing the space.

In the present utility model, the inner rotor assembly and the outer rotor assembly share one stator assembly 100, and the first tooth portion 112 and the second tooth portion 113 of the stator assembly 100 share one base ring 111, and the inner rotor assembly 200 and the outer rotor assembly 300 share one rotation shaft. So set up, not only reduce spare part, make whole motor structure's compact structure moreover to reduce whole motor structure's size.

In the present embodiment, the number of teeth of the first tooth portion 112 is different from the number of teeth of the second tooth portion 113. Wherein the number of teeth of the second tooth portion 113 is greater than the number of teeth of the first tooth portion 112. The number of teeth of the first tooth portion 112 is different from the number of teeth of the second tooth portion 113, so that the requirements of the inner rotor assembly 200 and the outer rotor assembly 300 matched with the stator assembly 100 can be better met, and the performance of the motor can be improved more possibly. Moreover, since the second tooth portions 113 are disposed on the outer ring of the base ring 111, the circumferential dimension thereof is larger, and the larger circumferential dimension is utilized to set a larger number of second tooth numbers, so that the motor performance can be improved to a greater extent.

The number of teeth of the first tooth portion 112 and the second tooth portion 113 may be set in various manners, and in the first manner, the number of teeth of the first tooth portion 112 is a multiple of 2, the number of teeth of the second tooth portion 113 is a multiple of 2, for example, the number of teeth of the first tooth portion 112 is 2, and the number of teeth of the second tooth portion 113 is 4; in the second mode, the number of teeth of the first tooth 112 is a multiple of 3, and the number of teeth of the second tooth 113 is also a multiple of 3, for example, the number of teeth of the first tooth 112 is 6, and the number of teeth of the second tooth 113 is 9; in the third embodiment, the number of teeth of the first tooth portion 112 is a multiple of 2, the number of teeth of the second tooth portion 113 is a multiple of 3, for example, the number of teeth of the first tooth portion 112 is 4, and the number of teeth of the second tooth portion 113 is 6.

Further, the number of teeth of the second tooth portion 113 is a multiple of the number of teeth of the first tooth portion 112, and the "multiple" may be 2, 3, 4, 5, 6, or the like. Preferably, the number of teeth of the second tooth portion 113 is twice that of the first tooth portion 112, for example, the number of teeth of the second tooth portion 113 is 12, and the number of teeth of the first tooth portion 112 is 6.

In order to avoid short circuit caused by direct contact between the stator wire and the stator core 110, the stator core 110 is further provided with an insulating member, and the insulating member has the following functions: separating the stator wire from the stator core 110. The insulator includes a first stator end cap 120 and a second stator end cap 130, the first stator end cap 120 and the second stator end cap 130 being made of a plastic material. When in installation, the first stator end cover 120 and the second stator end cover 130 are respectively sleeved on the stator core 110 from two end sides of the stator core 110. The end of the first stator end cover 120 close to the second stator end cover 130 may be abutted against or spaced apart from the end of the second stator end cover 130 close to the first stator end cover 120. The end parts of the two stator end covers are propped against each other, so that better insulation can be realized; the end parts of the two end covers are spaced at a certain distance, so that the installation requirement on the end covers is lower and the installation is more convenient on the premise of meeting the insulation requirement.

Of course, the insulating member includes, but is not limited to, the first stator end cover 120 and the second stator end cover 130, and may be an insulating coating applied to the surface of the stator core 110, and the insulating coating may be a ceramic insulating coating, etc. The insulator may also be an insulating paper disposed against the stator core 110. The insulating coating and the insulating paper are lighter and thinner, and the same space can be wound around more stator wires, so that the motor efficiency is improved.

In this embodiment, the second stator end cover 130 is disposed closer to the housing seat 500 than the first stator end cover 120, and the end side of the second stator end cover 130 closer to the housing seat 500 is provided with a positioning post 131, where the positioning post 131 extends along the axial direction of the motor structure. Referring to fig. 6, a limiting groove 530 is formed in an axial recess of an end surface of the housing seat 500, which is close to the second stator end cover 130, and during installation, a free end of the positioning post 131 is inserted into the limiting groove 530, and the positioning post 131 and the limiting groove 530 together define an installation position of the stator assembly 100, so that the mounting precision is high.

In order to facilitate the disassembly and assembly, the housing seat 500 is detachably connected with the stator assembly 100, and after the stator assembly 100 is mounted on the housing seat 500, the stator assembly 100 is fixed relative to the housing seat 500. The housing seat 500 may be a part of the motor structure or a part of the casing of the electric tool.

The housing mount 500 may be connected to the stator assembly 100 by a snap fit connection or by fasteners 510. Fig. 4 is a schematic view of the connection between the housing base 500 and the stator assembly 100 by means of a fastener 510, the fastener 510 being engaged with a nut 520 after penetrating the stator assembly 100 and the housing base 500 in the axial direction of the motor structure, thereby achieving the connection of the stator assembly 100 and the housing base 500. Wherein the fastener 510 is a long bolt. It should be noted that the fastener 510 is disposed through the positioning post 131 at the same time, so that the structure is more compact. In this embodiment, a hollow mounting post 121 is disposed on an end of the first stator end cover 120 away from the housing seat 500, an axially extending guide tube 114 is disposed on the base ring 111 of the stator core 110, and the positioning post 131, the mounting post 121 and the guide tube 114 are coaxially disposed to mount a fastener 510. Preferably, the end of the fastener 510 is located within the extension of the mounting post 121, i.e. the end of the fastener 510 does not extend beyond the mounting post 121, whereby the fastener 510 has no exposed portion in the axial direction of the stator assembly, and has good insulation properties, avoiding affecting the magnetic circuit of the motor.

The inner rotor assembly 200 includes a rotating shaft 210 rotatably disposed on the housing seat 500, and an inner magnet 220 fixedly disposed on an outer sidewall of the rotating shaft 210. The first teeth 112 are disposed on the outer side of the inner magnet 220 in the circumferential direction, and are spaced apart from the inner magnet 220 in the radial direction of the rotating shaft 210.

Referring to fig. 7, the outer rotor assembly 300 includes a sleeve housing 310 and an outer magnet 320 fixed to an inner wall of the sleeve housing 310. The rotating shaft 210 is located at the center of the sleeve housing 310, the sleeve housing 310 is fixedly arranged on the rotating shaft 210, and the sleeve housing 310 rotates synchronously with the rotating shaft 210. The outer magnets 320 are spaced apart in the circumferential direction of the stator assembly 100 and are located outside the second tooth 113. The outer magnet 320 is spaced apart from the second tooth 113 in the radial direction of the rotation shaft 210.

In the present embodiment, the heat sink 400 is a fan, and the heat sink 400 and the housing seat 500 are distributed at both end sides of the stator assembly 100. The heat sink 400 is secured within the sleeve housing 310. The end face of the sleeve shell 310, which is close to the heat dissipation piece 400, is provided with a communication port for air inlet, and the end of the sleeve shell 310, which is far away from the heat dissipation piece 400, is open. When the sleeve housing 310 rotates, the heat sink 400 is driven to rotate together, and air outside the sleeve housing 310 enters the sleeve housing 310 under the action of the heat sink 400 and flows out through the opening of the sleeve housing 310, thereby realizing the heat carrying out of the motor structure.

Of course, the location of the heat sink 400 is not necessarily limited to the interior of the sleeve housing 310, but may be located outside of the sleeve housing 310. In addition, the heat sink 400 is not limited to be fixed to the sleeve housing 310, and the heat sink 400 may be fixed to the rotating shaft 210.

Referring to fig. 8, the heat sink 400 includes an impeller 410, an extension ring 420 fixed to the peripheral outer end of the impeller 410, and a plurality of fins 430 disposed on the end side of the extension ring 420. The plurality of fins 430 are spaced apart in the circumferential direction of the impeller 410 and extend in the axial direction of the impeller 410 to form a groove for defining the installation position of the outer magnet 320, which can effectively improve the installation accuracy and efficiency of the outer magnet 320. Wherein, impeller 410, extension ring 420 and a plurality of fin 430 integrated into one piece, the lateral wall of extension ring 420 and the lateral wall of fin 430 laminate with sleeve shell 310's inner wall respectively.

Example two

The utility model also provides an electric tool, which comprises the motor structure in the first embodiment. Because the motor structure of the first embodiment reduces the contradiction between the motor performance and the size requirement, the increase of the size of the motor is limited while the motor performance is improved. Therefore, the performance of the electric tool of the embodiment is also significantly improved and the structure is more compact.

It will be apparent that the embodiments described above are merely some, but not all, embodiments of the utility model. Based on the embodiments of the present utility model, those skilled in the art may make other different changes or modifications without making any creative effort, which shall fall within the protection scope of the present utility model.

Claims (10)

1. An electric motor structure, comprising:

a stator assembly;

an inner rotor assembly which is arranged on the inner side of the stator assembly and can rotate relative to the stator assembly;

the outer rotor assembly is arranged on the outer side of the stator assembly and can rotate relative to the stator assembly;

a heat sink disposed within the motor structure, the heat sink configured to generate a heat dissipating airflow through the stator assembly, the inner rotor assembly, and the outer rotor assembly;

the stator assembly is provided with a first tooth part opposite to the inner rotor assembly and a second tooth part opposite to the outer rotor assembly, and the number of teeth of the first tooth part is different from the number of teeth of the second tooth part.

2. The motor structure of claim 1, wherein,

the number of teeth of the second tooth part is larger than that of the first tooth part;

wherein the number of teeth of the first tooth part is a multiple of 2, and the number of teeth of the second tooth part is a multiple of 2; or,

the number of teeth of the first tooth part is a multiple of 3, and the number of teeth of the second tooth part is a multiple of 3; or,

the number of teeth of the first tooth part is a multiple of 2, and the number of teeth of the second tooth part is a multiple of 3.

3. The motor structure of claim 2, wherein,

the number of teeth of the second tooth is a multiple of the number of teeth of the first tooth.

4. The motor structure of claim 3, wherein,

the number of teeth of the second tooth part is 12, and the number of teeth of the first tooth part is 6.

5. The motor structure of claim 1, wherein,

the second teeth and the first teeth are staggered in the circumferential direction of the stator assembly.

6. The motor structure of claim 1, wherein,

the stator assembly comprises a stator core, wherein the stator core comprises a base ring, a first tooth part arranged on an inner ring of the base ring and a second tooth part arranged on an outer ring of the base ring, and the first tooth part and the second tooth part are configured to wind a set sub-line;

wherein the first teeth are circumferentially spaced apart from the base ring and radially spaced apart from the inner rotor assembly;

the second teeth are circumferentially spaced apart from the base ring and radially spaced apart from the outer rotor assembly.

7. The motor structure of claim 6, wherein,

an insulator is also provided on the stator core, the insulator being configured to separate the stator wire from the stator core.

8. The motor structure of claim 7, wherein,

the insulation piece comprises a first stator end cover and a second stator end cover, the first stator end cover and the second stator end cover are respectively sleeved on the stator core from two end sides of the stator core, wherein the end part, close to the second stator end cover, of the first stator end cover is abutted with the end part, close to the first stator end cover, of the second stator end cover or is arranged at a certain distance; or,

the insulating piece is an insulating coating coated on the surface of the stator core; or,

the insulating piece is insulating paper which is arranged close to the stator core.

9. The motor structure of claim 1, further comprising:

the shell seat is detachably connected with the stator assembly, and the stator assembly is fixed relative to the shell seat;

the shell seat and the heat dissipation piece are distributed on two end sides of the stator assembly.

10. A power tool comprising a motor structure as claimed in any one of claims 1 to 9.