CN215378732U - Motor, fan and domestic appliance - Google Patents

Abstract

The utility model provides a motor, a fan comprising the motor and a household appliance, wherein the motor comprises a shell, a rotating shaft assembly, a rotor assembly and a stator assembly, and the shell is provided with a front end and a rear end which are oppositely arranged; the rotating shaft assembly comprises a first rotating shaft, a second rotating shaft and a first bearing, the first rotating shaft is arranged in a hollow mode, the first rotating shaft is sleeved on the outer side of the second rotating shaft, and the first bearing is arranged between the inner periphery of the first rotating shaft and the outer periphery of the second rotating shaft; the rotor assembly is arranged in the shell and comprises a first rotor and a second rotor, and the first rotor and the second rotor are respectively and correspondingly sleeved on the first rotating shaft and the second rotating shaft; the stator assembly is fixed inside the shell and comprises a first stator and a second stator, and the first stator and the second stator are respectively sleeved on the outer sides of the first rotor and the second rotor correspondingly. Therefore, the motor solves the problem of overlarge size of the motor in the prior art.

Description

Motor, fan and domestic appliance

Technical Field

The utility model relates to the technical field of household appliances, in particular to a motor, a fan comprising the motor and a household appliance comprising the fan.

Background

With the continuous improvement of the demand of quality of life, the motor is also put forward more functional requirements. Such as a dual-shaft output motor having two output shafts that extend in the same direction or away from each other. However, the existing double-shaft output motor scheme adopts the nested arrangement of inner and outer rotor motors, that is, two separate motors are adopted to respectively drive 2 nested output shafts correspondingly. The motor is not high in structural reliability, large in size and limited in application scene due to the arrangement. Namely, the double-shaft output motor in the prior art has the problem of large size.

SUMMERY OF THE UTILITY MODEL

The utility model provides a motor, a fan comprising the motor and a household appliance comprising the fan, and aims to solve the problem that a double-shaft output motor in the prior art is large in size.

In order to solve the above problems, the present invention provides a motor, which includes a housing, a rotating shaft assembly, a rotor assembly, and a stator assembly, wherein the housing has a front end and a rear end which are oppositely arranged; the rotating shaft assembly comprises a first rotating shaft, a second rotating shaft and a first bearing, the first rotating shaft is arranged in a hollow mode, the first rotating shaft is sleeved on the outer side of the second rotating shaft, and the first bearing is arranged between the inner periphery of the first rotating shaft and the outer periphery of the second rotating shaft; the rotor assembly is arranged in the shell and comprises a first rotor and a second rotor, and the first rotor and the second rotor are respectively and correspondingly sleeved on the first rotating shaft and the second rotating shaft; the stator assembly is fixed inside the shell and comprises a first stator and a second stator, and the first stator and the second stator are correspondingly sleeved outside the first rotor and the second rotor respectively.

In an alternative embodiment, the front end of the second rotating shaft extends out of the front end of the first rotating shaft, and the first bearing is arranged at the front end of the first rotating shaft.

In an optional embodiment, the first rotating shaft includes a first sleeve and a second sleeve, a rear end of the first sleeve is sleeved on a front end of the second sleeve, the first sleeve is disposed outside the housing, and a front end of the second sleeve protrudes from the housing and enters the first sleeve.

In an alternative embodiment, the first sleeve and the second sleeve are detachably connected or integrally provided.

In an optional embodiment, the motor further includes a second bearing, the second bearing is sleeved on the first rotating shaft, and the second bearing is disposed between the first rotor and the second rotor.

In an optional embodiment, the motor further includes a third bearing, the third bearing is sleeved on the first rotating shaft, and the third bearing is disposed between the housing and the first rotor.

In an optional embodiment, the motor further includes a fourth bearing, the fourth bearing is sleeved on the second rotating shaft, and the fourth bearing is disposed between the housing and the second rotor.

In an optional embodiment, the housing includes a front end cover, a rear end cover and a housing body, the front end cover and the rear end cover are respectively disposed at two ends of the housing body, wherein a second bearing chamber for accommodating the second bearing is formed in the housing body; or, the motor still includes the protective housing, be formed with in the protective housing the second bearing room, the protective housing fixed connection the shell body.

In an optional embodiment, the material of the shell body is plastic, and the first stator, the second stator and the shell body are integrally injection-molded; or, the shell body includes first shell body and second shell body, first stator, the second stator correspond respectively with first shell body, the second shell body integrated into one piece that moulds plastics, first shell body with the connection can be dismantled to the second shell body.

In an optional embodiment, the shell body is made of metal, the shell body includes a first shell body and a second shell body, the first stator and the second stator are correspondingly fixed to the first shell body and the second shell body, respectively, and the first shell body and the second shell body are integrally arranged or detachably connected.

The utility model also provides a fan which comprises the motor.

In an optional embodiment, the blower includes a first fan and a second fan, the first fan is connected to the first rotating shaft, and the second fan is connected to the second rotating shaft.

The utility model also provides a household appliance comprising the fan.

The utility model provides a motor, a fan comprising the motor and a household appliance comprising the fan. Specifically, a first stator and a second stator are arranged in the motor shell, and a first rotor and a second rotor which correspond to the first stator and the second stator are respectively sleeved outside the first rotor and the second rotor correspondingly, so that the axial size of a motor with two output shafts is reduced. Therefore, the utility model solves the problem that the motor with double shafts in the prior art has larger axial size.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a cross-sectional view of a first embodiment of the motor of the present invention;

FIG. 2 is an exploded view of the motor of FIG. 1;

FIG. 3 is a cross-sectional view of a second embodiment of the motor of the present invention;

FIG. 4 is a cross-sectional view of a third embodiment of the motor of the present invention;

fig. 5 is a cross-sectional view of a fourth embodiment of the motor of the present invention;

FIG. 6 is a schematic structural view of a first embodiment of a rotor of the present invention;

FIG. 7 is a schematic structural view of a second embodiment of a rotor of the present invention;

fig. 8 is a schematic structural view of an embodiment of the motor of the present invention.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is 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 addition, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "A and/or B" as an example, including either the A aspect, or the B aspect, or both A and B satisfied aspects. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

With the continuous improvement of the quality of life, the motor is also provided with more functional requirements. For example, a dual-shaft output motor is sometimes required, and particularly, the dual-shaft output motor has two output shafts extending in the same direction or extending away from the shaft. However, the existing double-shaft output motor scheme has the defects of large size, low reliability and the like. Specifically, the existing double-shaft output motor is nested with an inner rotor motor and an outer rotor motor, that is, two independent motors are adopted to respectively drive 2 nested output shafts correspondingly. The motor is not high in structural reliability, large in size and limited in application scene due to the arrangement. In addition, the homonymy dual output technical scheme of current biax output motor, radial magnetic flux still has: the single-shaft motor and a transmission mechanism such as a gear and the like, and the two output shafts rotate at a fixed speed ratio and a steering direction. In this way, the movements of the two output shafts of the electric motor are not independent of one another, but rather influence one another. Cannot meet diversified use requirements. In addition, the transmission mechanisms such as gears and the like can generate larger noise in the operation process, and the use experience of users is influenced.

Referring to fig. 1 and 2, in order to solve the above problem, the present invention provides a motor 100. The motor 100 includes a housing 11, a rotation shaft assembly, a rotor assembly, and a stator assembly. The housing 11 has a front end and a rear end disposed opposite to each other. The rotation shaft assembly includes a first rotation shaft 121, a second rotation shaft 122, and a first bearing 151. The first rotating shaft 121 is hollow, and the first rotating shaft 121 is sleeved outside the second rotating shaft 122. The first bearing 151 is disposed between an inner circumference of the first rotation shaft 121 and an outer circumference of the second rotation shaft 122. The rotor assembly is disposed inside the housing 11. The rotor assembly includes a first rotor 131 and a second rotor 132, and the first rotor 131 and the second rotor 132 are respectively and correspondingly sleeved on the first rotating shaft 121 and the second rotating shaft 122. A stator assembly is fixed inside the housing 11, and the stator assembly includes a first stator 141 and a second stator 142. The first stator 141 and the second stator 142 are respectively and correspondingly sleeved outside the first rotor 131 and the second rotor 132.

Specifically, the first rotor 131 and the first stator 141 form a first driving system, and the second rotor 132 and the second stator 142 form a second driving system. The first driving system and the second driving system are integrated in one shell 11, and compared with a scheme of adopting two independent motor 100 driving systems, namely a scheme of nesting the inner rotor motor 100 and the outer rotor motor 100, the size of the motor 100 provided by the utility model is obviously reduced. Further, in the motor 100 of the present invention, the first driving system and the second driving system are independent from each other. That is, the first rotating shaft 121 and the second rotating shaft 122 move relatively independently, and the two rotating shafts do not need to adopt a fixed rotating speed ratio or steering. Compared with the motor 100 which adopts a gear transmission mechanism to realize double-shaft output in the prior art, the motor 100 provided by the utility model can be applied in a wider range, and can meet diversified use requirements.

In this embodiment, the first stator 141 and the second stator 142 are respectively sleeved on the outer sides of the first rotor 131 and the second rotor 132. Meanwhile, the first stator 141 and the second stator 142 are also hollow structures. The first and second rotors 131 and 132 are coaxially disposed with the first and second stators 141 and 142, respectively. And radial air gaps are respectively arranged between the first rotor 131 and the first stator 141 and between the second rotor 132 and the second stator 142. With this arrangement, the axial dimension of the motor 100 can be reduced.

On the basis of the above embodiment, the first rotating shaft 121 is hollow and is sleeved on the second rotating shaft 122. Both ends of the second rotating shaft 122 need to protrude from the first rotating shaft 121. With this arrangement, the length of the second rotating shaft 122 is greater than that of the conventional motor 100 in the prior art. Since the length of the second rotating shaft 122 is increased, the supporting rigidity of the second rotating shaft 122 also needs to be improved accordingly. There are two technical solutions for improving the supporting rigidity of the second rotating shaft 122. The shaft diameter of the second rotating shaft 122 is increased or a supporting point for supporting the second rotating shaft 122 is reasonably arranged. If the diameter of the second rotating shaft 122 is increased, the outer diameter of the first rotating shaft 121 and the size of other structures such as bearings are increased accordingly. This is not advantageous in downsizing the entire motor 100 and in reducing the manufacturing cost of the motor 100.

Therefore, the present invention provides a supporting point between the first rotating shaft 121 and the second rotating shaft 122. The support point may be a bearing or other feasible rotational support. In an alternative embodiment, the supporting point is the first bearing 151. The first bearing 151 is disposed between an inner peripheral wall of the first rotating shaft 121 and an inner peripheral wall of the second rotating shaft 122. Specifically, the inner circumference of the first bearing 151 is sleeved on the second rotating shaft 122, and the outer circumference of the first bearing 151 is connected to the first rotating shaft 121. Specifically, the support points are disposed between the inner peripheral wall of the first rotating shaft 121 and the outer peripheral wall of the second rotating shaft 122, so that the axial dimension of the entire motor 100 can be effectively compressed. Meanwhile, the arrangement increases the supporting rigidity of the second rotating shaft 122, and it is ensured that the rear end of the second rotating shaft 122 extends from the first rotating shaft 121 by a sufficient length, thereby ensuring that the supporting point of the second rotor 132 has a sufficient span. Further, the length of the front end of the second rotating shaft 122 protruding from the front end of the first rotating shaft 121 needs to be as short as possible, so as to improve the support rigidity of the entire rotating shaft assembly.

Referring to fig. 2, in another alternative embodiment, the motor 100 further includes a second bearing 152, a third bearing 153 and a fourth bearing 154. The second bearing 152 and the third bearing 153 are all sleeved on the first rotating shaft 121. The fourth bearing 154 is sleeved on the second shaft 122. Specifically, the fourth bearing 154 is sleeved on a portion of the rear end of the second rotating shaft 122 extending out of the first rotating shaft 121. And the second bearing 152 is disposed between the first rotor 131 and the second rotor 132, the third bearing 153 is disposed between the front end of the housing 11 and the first rotor 131, and the fourth bearing 154 is disposed between the second rotor 132 and the rear end of the housing 11. Specifically, the inner circumferences of the second bearing 152 and the third bearing 153 are fixed to the first rotating shaft 121 and the outer circumference thereof is fixed to the housing 11, and the inner circumference of the fourth bearing is fixed to the second rotating shaft 122 and the outer circumference thereof is fixed to the housing 11.

Specifically, the second bearing 152 and the third bearing 153 are respectively disposed at two axial sides of the first rotor 131, and double-end support is implemented for the first rotor 131, so that support rigidity of the first rotor 131 is improved. And the first bearing 151 is disposed at the second rotating shaft 122, and the fourth bearing 154 is disposed between the second rotor 132 and the rear end of the housing 11. That is, the second rotating shaft 122 and the second rotor 132 together form a second rotor 132 system. The first bearing 151 and the fourth bearing 154 are respectively used for supporting two ends of the second rotor 132 system, so as to improve the rotational stability of the second rotor 132 system. Further, the first, second, third and fourth bearings 154 improve the supporting rigidity of the whole rotating shaft assembly, so that the structure of the motor 100 is more stable and reliable.

On the basis of the above embodiment, the first, second, third and fourth bearings 154 may adopt bearings with rotation support effect, such as sliding bearings, sliding shafts, magnetic levitation bearings or air bearings. In an alternative embodiment, the first bearing 151 is a sliding bearing. The sliding bearing has the characteristics of small radial space and large supporting load. In addition, during installation, the outer diameter of the second rotating shaft 122 does not need to be changed, which is beneficial to reducing the manufacturing cost. The second bearing 152, the third bearing 153 and the fourth bearing 154 may adopt ball bearings, the ball bearings are one type of rolling bearings, and ball bearings are arranged between the inner steel ring and the outer steel ring and can bear large load. Also called ball bearings. The ball bearing is a common bearing, and the adoption of the ball bearing is beneficial to reducing the manufacturing cost.

In an alternative embodiment, the housing 11 is also configured to accommodate the first, second, third and fourth bearings 154. The housing 11 includes a front cover 111, a rear cover 113, and a case body 112. The front end cover 111 and the rear end cover 113 are respectively disposed at two ends of the housing 112. Further, the front end cover 111 includes a protective cover 111a, a sealing cover 111b and a front bearing chamber 111c in sequence from outside to inside. The front bearing chamber 111c is used for accommodating the third bearing 153, and the front bearing chamber 111c is provided with a through hole for the rotating shaft to pass through. And the rear end cap 113 is also provided with a rear bearing chamber for receiving the fourth bearing 154.

In an alternative embodiment, to accommodate the second bearing 152, the motor 100 further includes a protective casing 114. The second bearing 152 is received within the protective shell 114. The protective shell 114 is fixed inside the housing 11. In an alternative embodiment, the protective casing 114 may be omitted and a corresponding hollow portion may be provided directly in the casing body 112, in which the second bearing 152 is fixed.

Referring to fig. 3, in an alternative embodiment, the front end of the second rotating shaft 122 extends from the front end of the first rotating shaft 121, and the first bearing 151 is disposed at the front end of the first rotating shaft 121. Optionally, the first rotating shaft 121 is a through shaft, and the second rotating shaft 122 is a seamless steel pipe, so that the cutting allowance during machining can be reduced, and the manufacturing cost can be reduced. Further, the first bearing 151 is disposed near a front end of the second rotating shaft 122. This arrangement ensures that the length of the front end of the second rotating shaft 122 protruding from the front end of the first rotating shaft 121 needs to be as short as possible, thereby improving the support rigidity of the entire rotating shaft assembly.

In an alternative embodiment, the inner hole of the first rotating shaft 121 includes a first hole section and a second hole section sequentially arranged from the front end to the rear end, the diameter of the first hole section is larger than that of the second hole section, and the first bearing 151 is arranged in the first hole section. With this arrangement, it is not necessary to change the outer diameter of the first rotating shaft 121 when the first bearing 151 is installed. Is beneficial to reducing the manufacturing cost.

Referring to fig. 3, in an alternative embodiment, the first rotating shaft 121 includes a first sleeve and a second sleeve, a rear end of the first sleeve is sleeved on a front end of the second sleeve, the first sleeve is disposed outside the housing 11, and a front end of the second sleeve extends out of the housing 11 and enters the first sleeve. Further, the diameter of the first sleeve is larger than the diameter of the second sleeve. Optionally, the first bearing 151 is a rolling bearing, and the rolling bearing has high rotation precision. In some occasions where the requirement on the rotating speed is high or the requirement on the rotating precision is high, a rolling bearing can be preferably selected. However, the radial dimension of the rolling bearing is larger than that of the sliding bearing. The use of rolling bearings for the first bearing 151 increases the outer diameter of the first shaft 121, which results in a corresponding increase in the specifications of the second bearing 152 and the third bearing 153, which is not favorable for reducing the manufacturing cost and compressing the axial height. Therefore, the present invention proposes a first rotating shaft 121, wherein the first rotating shaft 121 comprises a first sleeve and a second sleeve, and the outer diameter of the first sleeve is larger than the outer diameter of the second sleeve. The first bearing 151 is mounted on the first casing, and the second bearing 152 and the third bearing 153 are mounted on the second casing. Thus, the first sleeve and the second sleeve can be respectively adapted to the inner diameters of different bearings, which is beneficial to reducing the manufacturing cost of the motor 100 and further reducing the manufacturing size of the motor 100.

In an alternative embodiment, the first sleeve 121a and the second sleeve 121b are detachably connected or integrally disposed. In order to further reduce the cost, two seamless steel pipes with different specifications can be used for the first casing 121a and the second casing 121 b. The two seamless steel pipes with different specifications can be combined together in a detachable connection mode and can also be arranged integrally. And the cost of detachable connection of the two steel pipes is lower.

In an optional embodiment, the housing 11 includes a front end cover 111, a rear end cover 113, and a housing body, where the front end cover 111 and the rear end cover 113 are respectively disposed at two ends of the housing body, and a second bearing chamber for accommodating the second bearing 152 is formed in the housing body; or, the motor 100 further includes a protective shell 114, the second bearing chamber is formed in the protective shell 114, and the protective shell 114 is fixedly connected to the shell body. Specifically, the arrangement of the second bearing chamber brings technical difficulty to the processing of the shell body. This makes the entire cross-section of the housing body assume an i-shaped configuration, which does not allow for a simple cylindrical configuration. Further, the second bearing chamber may be formed by directly machining the housing body, or a second bearing chamber may be formed in the protective housing 114, and the protective housing 114 and the housing body are integrally connected.

In an alternative embodiment, the material of the housing body is plastic, and the first stator 141, the second stator 142 and the housing body are integrally injection-molded; or, the housing includes a first housing 112a and a second housing 112b, the first stator 141 and the second stator 142 are respectively and correspondingly formed with the first housing 112a and the second housing 112b by injection molding, and the first housing 112a and the second housing 112b are detachably connected. Specifically, the first shell 112a and the second shell 112b are made of an integral plastic material, that is, they are an integral body, and the first stator 141 and the second stator 142 are integrally injection-molded with the shell, as shown in fig. 1, the mold of the integral shell with this structure has a large difficulty in manufacturing, but has a simple assembly process;

in another alternative embodiment, the first housing 112a and the second housing 112b112b are made of plastic material, but the first housing 112a and the first stator 141141 are integrally formed by injection molding; the second housing body 112b112b is integrally injection-molded with the second stator 142142, and then the first and second housing bodies 112b are assembled together. Referring to fig. 4, the mold with such a structure has small manufacturing difficulty and a simple assembly process, but the assembly precision is not easy to guarantee.

In an optional embodiment, the shell is made of metal, the shell includes a first shell 112a and a second shell 112b, the first stator 141 and the second stator 142 are correspondingly fixed to the first shell 112a and the second shell 112b, respectively, and the first shell 112a and the second shell 112b are integrally disposed or detachably connected. Specifically, the first shell 112a and the second shell 112b are made of metal materials, and may be an integral part (i.e., integrally disposed) or an assembly (i.e., detachably connected). Wherein integrative part precision is high, and the processing degree of difficulty is big. And the assembly parts have small processing difficulty and low assembly precision. The first stator 141 and the second stator 142 are fixedly connected to the first shell 112a and the second shell 112b, respectively, and the fixed connection may be by gluing or interference fit. The structure does not need to open a plastic-coated mold, and the heat dissipation performance is good.

In addition to the above embodiments, the second bearing chamber may be formed in the first housing 112a, the second housing 112b, or an integral housing formed by integrally disposing the first housing 112a and the second housing 112 b. Or, the second bearing chamber is formed in the protective casing 114, and the protective casing 114 may be fixed in the first casing 112a or the second casing 112b, so that the processing difficulty is reduced.

Referring to fig. 6, fig. 6 shows a first embodiment of a rotor according to the present invention. In the first embodiment of the rotor structure, the first rotor 131 or the second rotor 132 has a rotor core 13a and a plurality of permanent magnets 13b, and the permanent magnets 13b are magnetic steels. The magnetic steel is uniformly arranged on the radial outer side of the rotor core 13a along the circumferential direction of the rotor core 13a, and the magnetic steel and the first stator 141 or the second stator 142 are opposite to each other along the radial direction to form a radial air gap.

Referring to fig. 7, fig. 7 is a second embodiment of a rotor according to the present invention. In the second embodiment of the rotor structure, the first rotor 131 or the second rotor 132 includes a rotor core 13a, a plurality of permanent magnets 13b (i.e., magnetic steel), and a plastic package 13 c. Rotor core 13a axial equipartition is provided with a plurality of edges rotor core 13a radially extends's cuboid groove. The shape of the magnetic steel is approximately cuboid. And is accommodated in the rectangular parallelepiped groove. And the permanent magnet 13b and the rotor core 13a are injection molded by the plastic package body 13 c.

On the basis of the above embodiment, the first rotor 131 and the second rotor 132 may both adopt the rotor structure of the first embodiment. Or both the first rotor 131 and the second rotor 132 adopt the rotor structure in the second embodiment. Alternatively, the first rotor 131 and the second rotor 132 may both adopt different rotor structures, that is, the first rotor 131 adopts the structure mentioned in the first embodiment or the second embodiment, and the second rotor 132 adopts the structure mentioned in another embodiment. In addition to the first and second embodiments, the first and second rotors 131 and 132 may have various other structures. In an alternative embodiment, the first rotor 131 adopts the rotor structure mentioned in the first embodiment, and this arrangement can reduce the influence of a larger outer diameter of the rotating shaft on the magnetic circuit. The second rotor 132 adopts the rotor structure of the second embodiment, and this arrangement can increase the power density and compress the axial space.

Referring to fig. 8, the present invention further provides a fan including the motor 100 as described above. Since the motor 100 described above has two output shafts, the motor 100 is mainly applied to the motor 100 of a two-shaft output. Further, the fan using the motor 100 described above also has the advantages of small size, reliable structure, and the like.

Referring to fig. 8, in an alternative embodiment, the fan includes a first fan 200 and a second fan 300, the first fan 200 is connected to the first rotating shaft 121, and the second fan 300 is connected to the second rotating shaft 122. Further, the first fan 200 and the second fan 300 are respectively and correspondingly connected to the output ends of the first rotating shaft 121 and the second rotating shaft 122. When the motor 100 is started, the first rotor 131 and the first stator 141 form a first driving system to drive the first fan 200 to operate, and the second rotor 132 and the second stator 142 form a second driving system to drive the second fan 300 to operate. Further, although the first driving system and the second driving system are both located inside the housing 11, the two driving systems are independent from each other, that is, the movement of the first rotating shaft 121 and the movement of the second rotating shaft 122 can be controlled independently. So configured, independent selection of the first fan 200 and the second fan 300 may be achieved. The first fan 200 and the second fan 300 have various motion modes, such as speed, differential speed, reverse operation, etc., according to different application scenarios.

In an alternative embodiment, the utility model also provides a household appliance. The household appliance may be an air conditioner, a sterilizer, a fan, etc. The household appliance comprises the fan described above. The household appliance adopting the fan has the advantages of double-shaft output, compact structure, small occupied space, low manufacturing cost and the like.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (13)

1. An electric machine, comprising:

a housing having a front end and a rear end;

the rotating shaft assembly comprises a first rotating shaft, a second rotating shaft and a first bearing, the first rotating shaft is arranged in a hollow mode, the first rotating shaft is sleeved on the outer side of the second rotating shaft, and the first bearing is arranged between the inner periphery of the first rotating shaft and the outer periphery of the second rotating shaft;

the rotor assembly is arranged in the shell and comprises a first rotor and a second rotor, and the first rotor and the second rotor are respectively and correspondingly sleeved on the first rotating shaft and the second rotating shaft;

the stator assembly is fixed inside the shell and comprises a first stator and a second stator, and the first stator and the second stator are correspondingly sleeved on the outer sides of the first rotor and the second rotor respectively.

2. The motor of claim 1, wherein the front end of the second rotating shaft extends from the front end of the first rotating shaft, and the first bearing is disposed at the front end of the first rotating shaft.

3. The motor of claim 2, wherein the first shaft includes a first sleeve and a second sleeve, a rear end of the first sleeve is sleeved on a front end of the second sleeve, the first sleeve is disposed outside the housing, and a front end of the second sleeve protrudes from the housing and enters the first sleeve.

4. The electric machine of claim 3 wherein said first sleeve and said second sleeve are removably attached or integrally disposed.

5. The motor of claim 1, further comprising a second bearing, wherein an outer circumference of the second bearing is fixed inside the housing, an inner circumference of the second bearing is sleeved on the first rotating shaft, and the second bearing is disposed between the first rotor and the second rotor.

6. The motor of claim 5, further comprising a third bearing, wherein an outer circumference of the third bearing is fixed inside the housing, an inner circumference of the third bearing is sleeved on the first rotating shaft, and the third bearing is disposed between the front end of the housing and the first rotor.

7. The motor of claim 6, further comprising a fourth bearing, wherein an outer circumference of the fourth bearing is fixed inside the housing, an inner circumference of the fourth bearing is sleeved on the second rotating shaft, and the fourth bearing is disposed between the rear end of the housing and the second rotor.

8. The electric machine according to any one of claims 5 to 7, wherein the housing comprises a front end cap, a rear end cap and a housing body, the front end cap and the rear end cap are respectively disposed at two ends of the housing body, wherein a second bearing chamber for accommodating the second bearing is formed in the housing body; or,

the motor further comprises a protective shell, wherein the second bearing chamber is formed in the protective shell, and the protective shell is fixedly connected with the shell body.

9. An electric machine as claimed in claim 8, characterized in that the material of the housing body is plastic,

the first stator, the second stator and the shell body are integrally formed in an injection molding mode; or,

the shell body includes first shell body and second shell body, first stator the second stator correspond respectively with first shell body the second shell body integrated into one piece that moulds plastics, first shell body with the connection can be dismantled to the second shell body.

10. The motor according to claim 8, wherein the housing is made of metal, the housing includes a first housing and a second housing, the first stator and the second stator are respectively fixed to the first housing and the second housing, and the first housing and the second housing are integrally disposed or detachably connected.

11. A fan, characterized in that the fan comprises an electric machine according to any one of claims 1 to 10.

12. The fan as claimed in claim 11, wherein the fan comprises a first fan and a second fan, the first fan is connected to the first shaft, and the second fan is connected to the second shaft.

13. A household appliance, characterized in that it comprises a fan as claimed in any one of claims 11 to 12.

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