WO2018035716A1

WO2018035716A1 - External rotor electric machine

Info

Publication number: WO2018035716A1
Application number: PCT/CN2016/096384
Authority: WO
Inventors: 郑卫锋; 刘洋
Original assignee: 北京臻迪科技股份有限公司
Priority date: 2016-08-23
Filing date: 2016-08-23
Publication date: 2018-03-01
Also published as: CN108292864B; CN108292864A

Abstract

An external rotor electric machine, comprising a base (3), a stator assembly (2) fixed on the base (3), and an external rotor assembly (1) rotatably clipped on the stator assembly (2). The lower edge of the external rotor assembly (1) is disposed close to the base (3). The stator assembly (2) comprises an iron core (5) and a coil winding (4) wound on the iron core (5). A sealing insulating layer covers the surface of the iron core (5) and the coil winding (4). A first dust-proof mat (6) covering both the base (3) and the surface of the external rotor assembly (1) is disposed in a gap between the base (3) and the external rotor assembly (1). The external rotor electric machine is applicable to underwater and other severe environments, has a good insulating effect, is not easy to rust, and can filter out impurities in water, so that the service life of the external rotor electric machine is greatly prolonged.

Description

External rotor motor

Technical field

The invention relates to a motor, in particular an outer rotor motor.

Background technique

At present, the stator structure in the outer rotor motor includes an end cover, a stator core and a coil winding, and an insulator. The coil winding is wound around the stator core, and an insulator is mounted on the coil winding exposed at both ends of the stator core, and the stator of the insulator is mounted. Then, the end cover is press-fitted, and a bearing chamber and a screw hole are formed on the end cover. The bearing chamber is used to support the rotation of the motor, and the screw hole is used for mounting and fixing the stator component. A plurality of heat dissipation holes are formed in the outer rotor assembly of the outer rotor motor, and water and impurities are easily entered. The outer rotor structure has various defects, poor waterproofing, poor insulation performance, easy rusting and no dustproof, and easy to cause Motor bearing wear and even motor jam.

The present invention has been made in view of the above.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an outer rotor motor, which is suitable for use under water or other harsh environments, can have good insulation effect, and is not easy to rust, and can be filtered in water. Impurities greatly extend the service life of the outer rotor motor.

In order to solve the above technical problems, the basic idea of the technical solution adopted by the present invention is:

An outer rotor motor includes a base, a stator assembly fixed to the base, and an outer rotor assembly rotatably sleeved on the stator assembly, the lower edge of the outer rotor assembly being disposed adjacent to the base, the base and the outer rotor assembly A first dustproof pad covering both the base and the outer rotor assembly surface is provided at the gap.

Preferably, the bottom end of the base is fixed on a mounting seat, and the first dustproof pad is disposed between the mounting seat and the base and the outer rotor assembly and covers a gap between the base and the outer rotor assembly.

Preferably, the mounting seat is provided with a protruding screw seat, the screw seat abuts against the lower surface of the base, and the screw seat has a screw hole at the center to be fixed to the base by screws.

Preferably, the outer diameter of the base is not less than the outer diameter of the outer rotor assembly, the lower edge of the outer rotor assembly is disposed close to the circumference of the base, and the outer edge of the mounting seat is further provided with an annular side wall extending vertically upward. The annular sidewall is higher than the lower edge of the outer rotor assembly.

Preferably, a second dustproof pad is disposed between the bottom surface of the mounting base and the bottom surface of the base, and the height of the second dustproof pad is slightly larger than The height of the screw seat is corresponding to the opening, and the inner diameter of the through hole is smaller than the outer diameter of the screw seat.

Preferably, the first dustproof pad is disposed between the annular side wall and the outer rotor assembly and the base, and the distance between the annular side wall of the mounting seat and the outer rotor assembly and the distance between the side walls of the base is slightly smaller than the first dustproof The thickness of the mat.

Preferably, the motor base is connected with a wire, the mounting seat and the first dustproof pad, or the mounting seat corresponding to the second dustproof pad is provided with a lead wire, and the wire leads out of the motor through the lead wire.

Preferably, the stator assembly includes a stator core and a coil winding wound around the stator core, the stator core and the coil winding surface are covered with a sealing insulating layer, the coil winding is an enameled wire winding, and the enameled wire winding The exterior is coated with a corrosion resistant material.

Preferably, the dustproof motor further comprises a rotating shaft, the rotating shaft is fixedly connected with the outer rotor assembly, the rotating shaft is mounted on the base through a bearing support, the bearing is a ceramic bearing or a nylon bearing, the first defense The dust pad is made of a flexible material.

After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

1. The present invention provides an outer rotor motor using an outer rotor assembly, the stator core and the coil winding surface of the motor are covered with a sealing insulating layer, the coil winding is made of an enameled wire winding and the surface is coated with a water and corrosion resistant material, The motor is completely insulated to be suitable for use in water. Secondly, the structure of the outer rotor motor of the present invention is compressed and disposed with a dustproof pad. The dust pads of the present invention may be foam, sponge or other flexible material to ensure the presence of water. The impurities are filtered out, thereby protecting the internal structure of the motor, preventing the impurities from wearing the bearings of the motor, and greatly prolonging the service life of the motor.

2. The advantage of the ceramic bearing of the invention is that the ceramic is hardly corroded, so the ceramic rolling bearing is suitable for working in water. Secondly, since the density of ceramic is lower than that of steel, the weight is much lighter, so the centrifugal effect of the outer ring can be reduced by 40% when rotating, and the service life is greatly extended. Since the modulus of elasticity of ceramic is higher than that of steel, it is not easily deformed when subjected to force, so it is advantageous to increase the working speed and achieve higher precision. The outer rotor motor of the invention can also adopt nylon bearing, wherein the nylon bearing has low heat generation and strong carrying capacity, and can improve the limit rotation speed and life of the bearing. On the other hand, nylon bearings have the advantages of light weight and low noise.

3. Since the motor can be used for working in water, it can dissipate heat through water. Therefore, unlike the ordinary outer rotor assembly motor, a heat dissipation hole is formed in the outer rotor assembly housing, and the outer rotor assembly of the outer rotor motor of the present invention is closed at the top of the outer casing. No vents are provided to prevent impurities from entering, not only in water, but also in other harsh environments.

4. Each dustproof pad has a small compression amount and is attached to the motor to prevent impurities from entering the motor inside. At the same time, the dust pad made of flexible material does not add excessive resistance to the motor.

The specific embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

DRAWINGS

The drawings are intended to provide a further understanding of the invention, and are intended to be illustrative of the invention. It is apparent that the drawings in the following description are only some embodiments, and other drawings may be obtained from those skilled in the art without departing from the drawings. In the drawing:

Figure 1 is a structural exploded view of the outer rotor motor of the present invention;

Figure 2 is a structural view showing an embodiment of an outer rotor motor of the present invention;

Fig. 3 is a view showing another embodiment of the outer rotor motor of the present invention.

In the figure: 1, outer rotor assembly; 2, stator assembly; 3, base; 4, coil winding; 5, stator core; 6, first dust pad; 7, mounting seat; 8, second dust pad; 9, screw seat; 10, bearing.

It is to be understood that the drawings and the written description are not intended to limit the scope of the present invention in any way.

detailed description

The embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is not intended to limit the scope of the invention.

In the description of the present invention, it is to be noted that the orientation or positional relationship of the terms "upper", "lower", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, only for the purpose of The invention is not limited by the scope of the invention, and is not intended to be a limitation of the invention.

In the description of the present invention, it should be noted that the terms "mounting" and "connecting" are to be understood broadly, and may be, for example, a fixed connection, a detachable connection, or an integral, unless otherwise explicitly stated and defined. Ground connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.

Embodiment 1

Referring to Figures 1 and 3, an outer rotor motor of the present invention includes a base 3, a stator assembly 2 fixed to the base 3, and an outer rotor assembly 1 rotatably fastened to the stator assembly 2, the outer rotor assembly a lower edge is disposed adjacent to the base 3, the stator assembly 2 including a core and a coil winding 4 wound around the stator core 5, wherein the stator The surface of the core 5 and the coil winding 4 is covered with a sealing insulating layer, and a gap between the base 3 and the outer rotor assembly 1 is provided with a first dustproof pad 6 covering both the base 3 and the surface of the outer rotor assembly 1. Since the surface of the stator core 5 and the coil winding 4 of the motor is covered with a sealing insulating layer, the motor is completely insulated and suitable for use in water, and secondly, the first dustproof pad 6 is disposed on the structural gap of the outer rotor motor of the present invention. A dustproof pad 6 can be foam, sponge or other flexible material to ensure that impurities in the water are filtered out, thereby protecting the internal structure of the motor, such as the bearing 10 which can prevent impurities from wearing the motor, and greatly extending the motor. Service life.

Further, the bottom end of the base 3 is fixed on a mounting seat 7, and the first dustproof pad 6 is disposed between the mounting base 7 and the base 3 and the outer rotor assembly 1 and covers the base 3 and the outer rotor assembly. A gap between 1. Preferably, the mounting seat 7 is provided with a protruding screw seat 9 which abuts against the lower surface of the base 3. The screw seat 9 has a screw hole at the center to be fixed to the base 3 by screws.

Specifically, the outer diameter of the base 3 is not less than the outer diameter of the outer rotor assembly 1, the lower edge of the outer rotor assembly 1 is disposed close to the circumference of the base 3, and the outer edge of the mounting base 7 is further provided with a vertical upward extension. The annular side wall is higher than the lower edge of the outer rotor assembly 1, and a second dustproof pad 8 is disposed between the bottom surface of the mounting base 7 and the bottom surface of the base 3. The second dustproof pad 8 is slightly elevated. It is larger than the height of the screw seat 9 and correspondingly opens the through hole, and the inner diameter of the through hole is smaller than the outer diameter of the screw seat 9. By setting the height of the second dustproof pad 8 to be greater than the height of the screw seat 9, the second dustproof pad 8 has a certain amount of compression between the base 3 and the mounting seat 7 to facilitate the filtering of the connection between the screw seat 9 and the base 3. The water inside the motor filters the impurities in the water and sticks to the dustproof pad. The first dustproof pad 6 is disposed between the annular side wall and the outer rotor assembly 1 and the base 3. The distance between the annular side wall of the mounting seat 7 and the outer rotor assembly 1 and the side wall of the base 3 is slightly smaller than the first protection. The thickness of the dust pad 6 is such that the first dust pad 6 has a certain amount of compression, which is advantageous for filtering impurities in water or other environments.

The motor base 3 is connected with a wire, and the mounting seat 7 and the first dustproof pad 6, or the mounting seat 7 and the second dustproof pad 8 are correspondingly provided with a lead wire, and the wire leads out of the motor through the lead wire Externally, the lead wire of the first dustproof pad 6 is tightly disposed at the periphery of the wire to filter water that penetrates into the inside of the motor from the lead wire.

Preferably, the coil winding 4 is an enamel wire winding, and the enamel wire winding is externally coated with a corrosion resistant material. This enhances the corrosion resistance of the enameled wire windings, allowing the motor to be used in other harsh environments.

The outer rotor motor of the present invention further includes a rotating shaft fixedly coupled to the outer rotor assembly 1, the rotating shaft being supported by the bearing 10 and mounted on the base 3, the bearing 10 being a ceramic bearing or a nylon bearing. Because ceramic bearings are hardly corrosive, ceramic rolling bearings are suitable for working in water. Secondly, since the density of ceramic is lower than that of steel, the weight is much lighter, so the centrifugal effect of the outer ring can be reduced by 40% when rotating, and the service life is greatly extended. Since the modulus of elasticity of ceramic is higher than that of steel, it is not easily deformed when subjected to force, so it is advantageous to increase the working speed and achieve higher precision. The outer rotor motor of the present invention can also adopt a nylon bearing, wherein the nylon bearing has low heat generation capacity and strong bearing capacity, and can improve the limit rotation speed of the bearing 10 and life. On the other hand, nylon bearings have the advantages of light weight and low noise. The outer rotor motor of the present invention is not only suitable for use in water operations, but also for use in other more harsh environments.

Since the motor can be dissipated by water when it is used in water, and the dustproof performance of the motor is taken into consideration, the motor of the outer rotor assembly is different from the ordinary outer rotor assembly motor, and the outer rotor motor of the present invention is externally disposed. The top casing of the rotor assembly is closed, and no heat dissipation holes are provided to prevent impurities from entering. Of course, the outer rotor motor of the present invention can be applied not only to water but also to other harsh environments.

Embodiment 2

Referring to an embodiment of the outer rotor motor of the present invention shown in FIG. 2, wherein the outer rotor motor includes an outer rotor assembly 1, the outer rotor assembly 1 is sleeved outside the stator assembly 2, and the outer rotor assembly 1 and the rotating shaft are connected. Together, the stator assembly 2 comprises a stator core 5 and a coil winding 4, wherein the stator core 5 and the coil winding 4 are externally injection molded with an insulating casing or a surface coated with a sealing insulating layer, by injection molding an insulating casing or by applying a sealing insulating layer. The stator core 5 and the coil winding 4 are isolated from the outside, so that the outer rotor motor of the present invention has good insulation, waterproof and corrosion resistance. Further, in this embodiment, a base 3 is further included, and the stator assembly 2 is fixed on the base. 3, the rotating shaft is supported and fixed on the base 3 through the bearing 10, wherein the base 3 has a circular structure and the outer diameter is slightly smaller than the inner diameter of the outer rotor assembly 1, and the lower edge of the outer rotor assembly 1 is not higher than the lower surface of the base 3. In the example, the bottom of the outer rotor assembly 1 and the bottom of the lower surface of the base 3 are further provided with a mounting base 7 for fixing the base 3. Preferably, the mounting base 7 and the base 3 are connected by screws. The base 3 preferably has a circular structure and a diameter not less than the inner diameter of the outer rotor assembly 1. In order to make the motor have a noise-proof effect, a first dustproof is provided between the mount 7 and the base 3 and the outer rotor assembly 1. a pad, the first dust pad covers a gap between the outer rotor assembly 1 and the base 3 to filter water that penetrates into the interior of the motor from the gap, and as a further optimization, the mounting seat 7 is provided with a plurality of convexities a screw seat 9 abutting against a lower surface of the base 3, the screw seat 9 having a screw hole for fixing to the base 3 by a screw, the height of the first dust pad being slightly larger than the height of the screw seat 9 And the corresponding screw seat 9 is provided with a through hole, and the height of the first dustproof pad is set to be slightly larger than the height of the screw seat 9, so that the first dustproof pad has a certain amount of compression, thereby further achieving a good filtering effect. Preferably, the first dustproof pad can be foam, sponge or other flexible material, so as to ensure that impurities in the water are filtered out, thereby protecting the internal structure of the motor, such as the bearing 10 which can prevent the impurity from wearing the motor, and the large The amplitude extends the life of the motor. The second embodiment saves the second dust pad with respect to the first embodiment, so that the structure is simpler.

Embodiment 3

Referring to another implementation structure of the outer rotor motor of the present invention shown in FIG. 3, the third embodiment has the same outer rotor assembly 1 and stator assembly 2 as the second embodiment, except that the base 3 and the mounting base 7 have different structures and are implemented. In the third example, the base 3 has a cylindrical structure or the bottom of the base 3 has a cylindrical structure, and the outer diameter of the cylindrical structure is not less than the outer rotor assembly 1 The outer diameter of the outer rotor assembly 1 is disposed adjacent to the circumference of the base 3. Correspondingly, the outer edge of the mounting base 7 is provided with an annular side wall extending vertically upwardly, the annular side wall being higher than the outer rotor The lower edge of the assembly 1 is lower than the height of the base 3 in the first embodiment, and the height of the annular side wall is also reduced. Thus, the two in the embodiment 1 can be used in this embodiment. A dustproof pad is integrally provided, that is, the first dustproof pad 6 and the second dustproof pad 8 in FIG. 3 are integrally disposed to form a sleeve-shaped dustproof pad, wherein the side wall of the sleeve-shaped dustproof pad It is disposed between the annular side wall of the mounting seat 7 and the outer rotor assembly 1 and the side wall of the base 3, and covers the gap between the base 3 and the outer rotor assembly 1. Further, the annular side wall of the mounting seat 7 and the outer rotor assembly 1 and the distance between the side walls of the base 3 is slightly smaller than the thickness of the side wall of the sleeve-like dust pad. Therefore, the side wall of the sleeve-shaped dustproof pad has a certain amount of compression, which is favorable for filtering impurities in the water. The closed bottom surface of the sleeve-shaped dustproof pad is disposed in contact with the bottom surface of the base 3. Preferably, the thickness of the bottom surface of the sleeve-shaped dustproof pad is slightly larger than the height of the screw seat 9, and the through hole is correspondingly opened. The inner diameter of the hole is smaller than the outer diameter of the screw seat 9. Therefore, the closed bottom surface of the sleeve-shaped dustproof pad has a certain amount of compression in the height direction, and the closed bottom surface of the sleeve-shaped dustproof pad also has a certain amount of compression on the periphery of the connection between the screw seat 9 and the base 3, thereby It protects the motor by ensuring that all possible water in the entire motor is filtered through the dust pad.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and any technology that is familiar with the present patent. Those skilled in the art can make some modifications or modifications to equivalent embodiments by using the technical content of the above-mentioned hints without departing from the technical scope of the present invention, but the technology according to the present invention does not deviate from the technical solution of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments are still within the scope of the present invention.

Claims

An outer rotor motor, comprising: a base, a stator assembly fixed on the base; and an outer rotor assembly rotatably sleeved on the stator assembly, the lower edge of the outer rotor assembly being disposed adjacent to the base, the base and the base A first dustproof pad covering both the base and the outer rotor assembly surface is provided at the gap of the outer rotor assembly.
The outer rotor motor according to claim 1, wherein the bottom end of the base is fixed to a mounting seat, and the first dustproof pad is disposed between the mounting base and the base and the outer rotor assembly and covers A gap between the base and the outer rotor assembly.
The outer rotor motor according to claim 2, wherein the mounting seat is provided with a protruding screw seat, the screw seat abuts against a lower surface of the base, and the screw seat has a screw hole at the center to pass the screw Fixed to the base.
The outer rotor motor according to claim 3, wherein an outer diameter of the base is not smaller than an outer diameter of the outer rotor assembly, and a lower edge of the outer rotor assembly is disposed adjacent to a circumference of the base, and the outer edge of the mount There is also an annular side wall extending vertically upwardly, the annular side wall being higher than the lower edge of the outer rotor assembly.
The outer rotor motor according to claim 4, wherein a second dustproof pad is disposed between the bottom surface of the mounting base and the bottom surface of the base, and the height of the second dustproof pad is slightly larger than the height of the screw seat, and is correspondingly opened. a through hole having an inner diameter smaller than an outer diameter of the screw seat.
The outer rotor motor according to claim 5, wherein the first dustproof pad is disposed between the annular side wall and the outer rotor assembly and the side wall of the base, and the annular side wall and the outer rotor assembly of the mounting seat And the spacing of the side walls of the base is slightly smaller than the thickness of the first dustproof pad.
The outer rotor motor according to any one of claims 2-6, wherein the motor base is connected with a wire, the mounting seat and the first dustproof pad, or the mounting seat and the second dustproof pad are correspondingly opened. There is a lead wire through which the wire is led out of the motor.
The outer rotor motor according to claim 7, wherein said first dust pad lead is tightly disposed at a periphery of the wire.
The outer rotor motor according to claim 1, wherein the stator assembly includes a stator core and a coil winding wound around a stator core, the stator core and the coil winding surface are covered with a sealing insulating layer, the coil winding In the case of an enameled wire winding, the outer surface of the enameled wire winding is coated with a corrosion resistant material.
The outer rotor motor according to claim 1, further comprising a rotating shaft fixedly coupled to the outer rotor assembly, the rotating shaft being mounted on the base by bearing support, the bearing being a ceramic bearing or a nylon bearing, The first dustproof pad is made of a flexible material.