CN110994863A

CN110994863A - External rotor motor

Info

Publication number: CN110994863A
Application number: CN201911168722.7A
Authority: CN
Inventors: 陈川礼; 王伟明; 卓祖德; 李庆; 张德福; 江亚冲; 马子超
Original assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Kaibang Motor Manufacture Co Ltd
Current assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Kaibang Motor Manufacture Co Ltd
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-04-10
Anticipated expiration: 2039-11-25
Also published as: CN110994863B

Abstract

The invention provides an external rotor motor, wherein the external rotor motor comprises: a stator; and the outer surface of the first end cover is provided with a slope part from one end close to the stator to the other end far away from the stator, an arc part extending into a rotor assembly of the external rotor motor is convexly arranged at one end, and the arc part is arranged at a distance from the inner wall of the rotor assembly. The outer rotor motor has a good waterproof effect.

Description

External rotor motor

Technical Field

The invention belongs to the technical field of motors, and particularly relates to an outer rotor motor.

Background

The structure that the rotor part and the stator part have certain clearance is caused by the structure that the rotor of the outer rotor motor is outside and the stator is inside, so that the outer rotor motor is poorer in waterproof performance than the inner rotor motor. The existing outer rotor waterproof structure design has the following two problems that on one hand, the structure finally formed by the overall design of the outer rotor consumes excessive labor cost and material cost in the manufacturing process; on the other hand, the outer rotor waterproof structure designed by the method cannot achieve a good waterproof effect.

In order to overcome the defects of the prior art, a new outer rotor motor is needed to be provided.

Disclosure of Invention

In view of the above, an object of the present invention is to provide an outer rotor motor, which can at least partially overcome the defect of the waterproof effect in the prior art and can achieve a good waterproof effect.

In order to achieve the above object, the present invention provides an external rotor motor, wherein the external rotor motor includes:

a stator; and

the outer surface of the first end cover is provided with a slope part from one end close to the stator to the other end far away from the stator, an arc part extending into a rotor assembly of the external rotor motor is convexly arranged at one end, and the arc part is arranged at a distance from the inner wall of the rotor assembly.

The external rotor electric machine as described above, wherein the rotor assembly includes:

the arc-shaped part extends into the second end cover and is arranged at intervals with the inner wall of the second end cover;

and the rotating shaft extends into the second end cover and is connected with the second end cover through a rotor shaft sleeve.

The external rotor electric machine as described above, wherein the first end cover includes:

a cover having the slope portion;

the hollow end cover convex column is convexly arranged in the cover body, and a cavity is arranged between the hollow end cover convex column and the slope part.

The outer rotor motor as described above, wherein the rotation shaft extends into the end cap convex column and is connected with the end cap convex column through a bearing.

The outer rotor motor as described above, wherein the end cap boss is fitted to an inner circle of a stator core of the stator.

The outer rotor motor further comprises a waterproof cover arranged in the end cover convex column to seal the rotating shaft.

The outer rotor motor is characterized in that the side wall of the first end cover is further provided with a lug, and the lug is provided with a through hole.

The external rotor motor as described above, wherein the side portion of the lug is provided with a reinforcing plate that meets the side wall of the first end cover.

The outer rotor motor is characterized in that the outer side of the stator core is sleeved with the plastic-coated framework.

The outer rotor motor further comprises a snap ring sleeved on the rotating shaft, and the snap ring is connected with the bearing.

The outer rotor motor disclosed by the invention has the advantages that through the reasonable design of the structure of the outer rotor end cover, rainwater flows downwards under the action of gravity by utilizing the inclined part of the first end cover and the arc-shaped part at the top end. The arc-shaped part at the top end increases the travel distance of rainwater, so that the rainwater flows downwards under the influence of gravity in the process of upward flushing under the action of inertia, and the waterproof effect of the outer rotor motor is achieved.

Drawings

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

FIG. 1 is a schematic structural view of a rotor provided by an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a bushing provided in accordance with an embodiment of the present invention;

FIG. 3 is a schematic view of a rotor and a rotating shaft according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a stator provided by an embodiment of the present invention;

FIG. 5 is a schematic structural view of a first end cap provided by an embodiment of the present invention;

FIG. 6 is a schematic structural view of a waterproof cover provided by an embodiment of the present invention;

FIG. 7 is a schematic structural view of a mounting lug of a first endcap, as provided by an embodiment of the present invention;

fig. 8 is a schematic structural view of an outer rotor motor according to an embodiment of the present invention; and

fig. 9 is an enlarged view of a portion a of fig. 8 according to an embodiment of the present invention.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as an outer rotor motor, in order to provide a thorough understanding of embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known features are omitted so as not to obscure the description of the present invention with unnecessary detail.

In addition, in order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.

In order to explain the technical means of the present invention, the following description will be given by way of specific examples.

As shown in fig. 8, the present invention provides an outer rotor motor, the outer rotor electrode of the present invention comprising: the rotor assembly 100, the stator 200 and a first end cover 300 (also referred to as a rear end cover), the first end cover 300 is connected with the stator 200, the first end cover 300 is configured to have a slope portion 9 from one end close to the stator 200 to the other end far away from the stator 200, and an arc portion 7 protruding into the rotor assembly 100 of the external rotor motor is convexly arranged at one end, and the arc portion 7 is arranged at a distance from the inner wall of the rotor assembly 100.

The above-mentioned components and their assembled specific structures will be described in detail with reference to fig. 1 to 9.

Specifically, as shown in fig. 1, the rotor assembly 100 includes: a second end cover 1 (also called front end cover) and a rotating shaft 16, as shown in fig. 9, the arc-shaped part 7 extends into the second end cover 1 and is arranged at a distance from the inner wall of the second end cover 1, and the rotating shaft 16 extends into the second end cover 1 and is connected with the second end cover 1 through a rotor shaft sleeve 17. Specifically, the rotating shaft 16 is fixed on the rotor by a precise fit with the shaft sleeve 17, and the shaft sleeve 17 is in interference fit with the second end cover 1 of the rotor assembly 100. Slope portion 9 and the arc portion 7's on top of first end cover design, slope portion 9 of first end cover stretch into second end cover 1 end terminal surface 2 in, the design on slope makes the water droplet down along first end terminal surface under the effect of gravity, and end terminal surface 2 of first end cover 1 supports the rainwater that openly strikes, and the route of curved design messenger rainwater is prolonged, and the rainwater is down slided under the effect of gravity at the in-process of marcing.

As shown in fig. 5, the first end cap 1 includes: the cover comprises a cover body 11 and an end cover convex column 18, wherein the cover body 11 is provided with a slope part 9, the hollow end cover convex column 18 is convexly arranged in the cover body 11, a cavity is arranged between the hollow end cover convex column 18 and the slope part 9, as shown in figure 8, a rotating shaft extends into an inner cavity 10 of the end cover convex column 18 and is connected with the end cover convex column 18 through a bearing 19.

During assembly, the end cover convex column 18 is matched with the inner circle of the stator core 4 of the stator 200, specifically, the inner circle 24 of the stator core 4 and the surface 25 of the end cover convex column 18 adopt an interference fit mode, the ring sleeve 23 in the stator core 4 is pressed into the bulge 21 on the end cover convex column 18, and the bulge 21 in the end cover convex column 18 plays a role in limiting the plastic-coated framework 3 sleeved outside the stator core 4 of the plastic-coated stator 200.

Further, the outer rotor motor further comprises a waterproof cover 14 arranged in the end cover convex column to seal the rotating shaft. In one embodiment, the sidewall of the first end cap 300 is further provided with a lug 12, the lug 12 is provided with a through hole 13, and the lug 12 is designed to: the lug 12 is hollowed, the reinforcing plate 5 with a triangular structure on the back of the mounting lug 12 ensures the structural strength of the mounting lug 12, and the through hole 13 in the middle of the mounting lug ensures the waterproof effect of the end cover slope 9.

The outer rotor motor structure of the invention mainly comprises the following parts: the rotor assembly of fig. 3, the stator of fig. four (or referred to as a plastic-coated stator), and the first end cap of fig. 5. The rotor assembly of fig. 3 is formed by a rotating shaft 16 which is fixed on the second end cover 1 by a precise fit with a shaft sleeve 17, and the shaft sleeve 17 is in interference fit with the second end cover 1 (also called as a rotor). The first end cover of fig. 5 has two bearing chambers corresponding to the inner cavity 8 and the inner cavity 10 of the rear end cover of fig. five, and the plastic-coated stator of fig. 4 is composed of a stator core 4 and a plastic-coated framework 3. The plastic-coated stator of fig. 4 is pressed into the first end cover of fig. 5, the inner circle 24 of the stator core 4 and the surface 25 of the end cover convex column 18 of fig. 5 adopt an interference fit mode, the ring sleeve 23 in the stator core 4 is pressed onto the bulge 21 of the end cover convex column 18, and the bulge 21 of the end cover convex column 18 plays a role in limiting the position of the plastic-coated framework stator. Bearings 19 are pressed into the shaft 16 and are held in place by snap rings 20 and the bearings are each captured at the ends of the five first endcaps 5. the rotor assembly of fig. 3 is connected to the first endcaps of fig. 5 and the rotor assembly of fig. 3 is secured to the first endcaps of fig. 5. The structure of the outer rotor motor will be described in detail below with reference to fig. 8 and 9:

as shown in fig. 5, the design of the first end cap waterproof structure: the design of the slope part 9 and the top end arc part 7 is adopted by the first end cover, the slope surface of the rear end cover extends into the rotor end ring surface 2 to form a waterproof effect, a certain gap exists between the slope part 9 of the rear end cover and the rotor end ring surface 2, and the situation that the slope surface of the rear end cover does not have interference when the rotor runs is guaranteed, and the partial schematic diagram of the waterproof structure of the outer rotor in the figure nine is shown. Rear end cap slope 9 design principle: slope portion 9 makes the rainwater flow down under the effect of gravity at the in-process of marcing to avoid the rainwater to enter into the motor, lead to the corruption of motor components and parts, and cause the threat of short circuit. The top end arc part 7 can increase the traveling path of the rainwater, so that the rainwater flows downwards under the influence of gravity in the traveling process.

As shown in fig. 3, the rotor and the second end cap are integrated, the rotating shaft 16 forms an interference fit with the rotor shaft sleeve 17, so that the waterproof effect of the shaft outlet end face of the rotor assembly in fig. 3 is achieved, and the rotor extends out of the end ring face 2 to form a fit with the slope portion 9 of the rear end cap, so as to resist the rainwater on the front face.

As shown in fig. 4, the plastic-coated stator is composed of a stator core 4 and a plastic-coated bobbin 3. The plastic-coated stator of fig. 4 is pressed into the rear end cover of fig. 5, the inner circle 24 of the stator core 4 and the surface 25 of the end cover convex column 18 of fig. 5 adopt an interference fit mode, the ring sleeve 23 in the stator core 4 is matched with the bulge 21 of the end cover convex column 18, and the bulge 21 of the end cover convex column 18 plays a role in limiting the position of the plastic-coated framework stator.

The bearing chamber 10 of the first end cover and the waterproof cover 14 of fig. 5 form an interference fit, so that the rear end cover bearing chamber (10) is completely sealed, and the waterproof effect of the rear end cover bearing chamber is achieved.

The design of the lugs 12 of the first end cap comprises: the lugs 12 are hollowed out, the back of the lugs 12 are triangular to ensure the structural strength of the lugs 12, and the hollowing out of the mounting lugs 12 ensures the waterproof effect of the end cover slope 9.

The outer rotor motor of the invention utilizes the slope part 9 of the rear end cover and the top end arc part 7 at the top end to lead rainwater to flow downwards under the action of gravity by reasonably designing the structure of the outer rotor end cover. The cambered surface at the top end increases the travel distance of rainwater, so that the rainwater flows downwards under the influence of gravity in the process of upward flushing under the action of inertia, and the waterproof effect of the outer rotor motor is achieved. The waterproof cover 14 is directly adopted for waterproofing of the rear end cover bearing chamber 10 and is directly in close fit with the bearing chamber, so that the waterproof effect of the rear end cover bearing chamber is achieved. In conclusion, the outer rotor has the advantages of simple waterproof parts, better waterproof effect, high process implementation and less used materials in the waterproof structure.

Has the advantages that:

the design material cost is low: the outer rotor waterproof part that this structural design added is few, and the measure of taking on the waterproof construction makes the rainwater flow down under the effect of gravity for the top arc portion 7 that utilizes the slope portion 9 of rear end cover and increase stroke. The waterproof cover 14 is tightly matched with the bearing chamber 10 to achieve the waterproof effect of the bearing chamber, and the process has high feasibility of implementation.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims

1. An external rotor electric machine, characterized by comprising:

a stator; and

2. The external rotor electric machine of claim 1, wherein the rotor assembly includes:

3. The external rotor electric machine of claim 2, wherein the first end cap includes:

a cover having the slope portion;

4. The external rotor electric machine of claim 3, wherein the rotation shaft extends into the end cap boss and is connected with the end cap boss through a bearing.

5. The external rotor electric machine of claim 3, wherein the end cap posts mate with an inner circle of a stator core of the stator.

6. The external rotor electric machine of claim 4, further comprising a waterproof cover disposed within the end cover posts to seal the shaft.

7. The external rotor electric machine of claim 1, wherein the side wall of the first end cap is further provided with a lug, and the lug is provided with a through hole.

8. The external rotor electric machine of claim 7, wherein the side portions of the lugs are provided with reinforcing plates that meet the side walls of the first end cap.

9. The external rotor electric machine of claim 5, wherein the outer side of the stator core is sleeved with a plastic-coated framework.

10. The external rotor electric machine as claimed in claim 4, further comprising a snap ring fitted around the shaft, the snap ring being engaged with the bearing.