CN211296360U

CN211296360U - External rotor motor

Info

Publication number: CN211296360U
Application number: CN202020079756.0U
Authority: CN
Inventors: 石雷; 卢娟
Original assignee: Shenzhen Shineng Gaoke Power Co ltd
Current assignee: Shenzhen Shineng Gaoke Power Co ltd
Priority date: 2020-01-15
Filing date: 2020-01-15
Publication date: 2020-08-18
Anticipated expiration: 2030-01-15

Abstract

The utility model relates to an external rotor motor, which comprises a bottom plate, a stator component, a rotor component, a bearing and a bearing seat; the stator component comprises a stator core and a stator winding; the rotor assembly comprises a rotating shaft, a radial permanent magnet part, a shell and an axial permanent magnet part, wherein the radial permanent magnet part is fixed on the inner wall of the outer circumference part of the shell, the rotating shaft is fixed on a central through hole at the bottom of the shell, and the axial permanent magnet part is fixed on the inner surface of the bottom of the shell; one end of the bearing seat is fixed in the first through hole of the bottom plate, the other end of the bearing seat is suspended in the air and is fixed with the stator assembly, and the bearing is fixed in a bearing chamber of the bearing seat; one end of the rotating shaft is arranged in an inner hole of the bearing, a radial gap is formed between the stator core and the radial permanent magnet component, and an axial gap is formed between the axial permanent magnet component and the end part of the stator core and the end part of the bearing seat. The utility model discloses external rotor electric machine has rational in infrastructure, rotor subassembly is difficult to axial float, the noise is little and performance advantage such as more stable.

Description

External rotor motor

[ technical field ] A method for producing a semiconductor device

The utility model relates to a small-size or micro-motor especially relates to small-size or miniature external rotor electric machine.

[ background of the invention ]

The prior art external rotor motor comprises a bottom plate, a stator assembly, a rotor assembly, a bearing and a bearing seat; the stator assembly comprises a stator core and stator windings arranged in each stator slot of the stator core; the rotor assembly comprises a rotating shaft, radial permanent magnet parts and a concave cylindrical shell, wherein the radial permanent magnet parts are fixed on the inner wall of the outer circumferential part of the shell, and two ends of the rotating shaft are fixed on a central through hole at the bottom of the shell in a hanging manner; one end of the bearing seat is fixed in the first through hole of the bottom plate, the other end of the bearing seat is suspended in the air and is fixed with the stator assembly, and the bearing is fixed in a bearing chamber of the bearing seat; one end of the rotating shaft is arranged in an inner hole of the bearing, and a radial gap is formed between a stator core of the stator component and a radial permanent magnet component of the rotor component; because only one end of the rotating shaft is arranged in the inner hole of the bearing, the whole rotor assembly is easy to axially float, the performance of the outer rotor motor is unstable, and the noise is high.

[ Utility model ] content

The to-be-solved technical problem of the utility model lies in avoiding the weak point of above-mentioned prior art and providing an external rotor electric machine, have rational in infrastructure, rotor subassembly be difficult to axial float, the noise is little and performance advantage such as more stable.

The utility model provides a technical scheme that technical problem adopted is:

the outer rotor motor comprises a bottom plate, a stator assembly, a rotor assembly, a bearing and a bearing seat; the stator assembly comprises a stator core and stator windings arranged in each stator slot of the stator core; the rotor assembly comprises a rotating shaft, a radial permanent magnet part and a concave cylindrical shell, wherein the radial permanent magnet part is fixed on the inner wall of the outer circumferential part of the shell, and two ends of the rotating shaft are fixed on a central through hole at the bottom of the shell in a hanging manner; the front end of the bearing seat is fixed in the first through hole of the bottom plate, the rear end of the bearing seat is suspended and fixed with the stator assembly, and the bearing is fixed in a bearing chamber of the bearing seat; the front end of the rotating shaft is arranged in an inner hole of the bearing, and a radial gap is formed between a stator core of the stator assembly and a radial permanent magnet component of the rotor assembly; the rotor assembly further comprises an axial permanent magnet component, the axial permanent magnet component is fixed on the inner surface of the bottom of the shell, and axial gaps are formed among the axial permanent magnet component, the end portion of the stator core of the stator assembly and the end portion of the bearing seat.

The bearing is an oil bearing.

A first gasket is arranged between the bearing and the bottom of the bearing chamber of the bearing seat.

The front end of the rotating shaft is provided with a circle of concave gap, and the inner hole of the first gasket is clamped at the concave gap of the rotating shaft.

The bottom of the bearing chamber of the bearing seat is also provided with a containing cavity for containing the head of the rotating shaft, the head of the rotating shaft is positioned in the containing cavity of the bearing seat, and a second gasket is arranged between the head of the rotating shaft and the bottom of the containing cavity of the bearing seat.

The radial permanent magnet member is higher than an opening end surface of an outer circumferential portion of the housing.

The inner surface of the bottom of the shell is provided with a central convex column, and the axial permanent magnet component is sleeved on the central convex column and then fixed on the inner surface of the bottom of the shell.

Compared with the prior art, the utility model discloses external rotor electric machine's beneficial effect lies in:

the utility model particularly aims at arranging an axial permanent magnet component on the inner surface of the bottom of the shell, and axial gaps are formed among the axial permanent magnet component, the end part of the stator core of the stator component and the end part of the bearing seat; the axial permanent magnet component has the main functions that the axial permanent magnet component has certain suction to a stator core, a bearing and/or a bearing seat of the stator component, has a positioning function to the rotor component, prevents the rotor component from moving axially, ensures that the rotor component is not easy to shift, and ensures that the sound is better when the outer rotor motor of the utility model operates; the other effect in addition of axial permanent magnet part is exactly that the axial magnetic circuit that axial permanent magnet part formed does the utility model discloses external rotor electric machine's auxiliary magnetic circuit, with the utility model discloses external rotor electric machine's main magnetic circuit radial magnetic circuit that radial permanent magnet part formed has constituted together promptly the utility model discloses external rotor electric machine's two-way magnetic circuit has improved the utility model discloses external rotor electric machine's performance makes the utility model discloses external rotor electric machine performance is more excellent. To sum up, the utility model discloses external rotor electric machine has rational in infrastructure, rotor subassembly is difficult to axial float, the noise is little and performance advantage such as more stable.

[ description of the drawings ]

Fig. 1 is a front sectional view of an external rotor motor according to the present invention;

fig. 2 is a schematic axial projection view of the rotor assembly of the external rotor motor.

[ detailed description ] embodiments

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, an outer rotor motor includes a base plate 10, a stator assembly 20, a rotor assembly 30, a bearing 40, and a bearing housing 50; the stator assembly 20 includes a stator core 21 and stator windings 22 disposed in respective stator slots of the stator core 21; the rotor assembly 30 includes a rotating shaft 31, a radial permanent magnet part 32 and a concave cylindrical housing 33, the radial permanent magnet part 32 is fixed on the inner wall of the outer circumference 331 of the housing 33, and both ends of the rotating shaft 31 are fixed on the central through hole 3321 of the bottom 332 of the housing 33 in a hanging manner; the front end of the bearing seat 50 is fixed in the first through hole 11 of the base plate 10, the rear end of the bearing seat 50 is suspended and fixed with the stator assembly 20, and the bearing 40 is fixed in the bearing chamber 51 of the bearing seat 50; the front end of the rotating shaft 31 is arranged in the inner hole of the bearing 40, and a radial gap 99 is formed between the stator core 21 of the stator assembly 20 and the radial permanent magnet part 32 of the rotor assembly 30; the rotor assembly 30 further includes an axial permanent magnet member 34, the axial permanent magnet member 34 being fixed to an inner surface of the bottom portion 332 of the housing 33, the axial permanent magnet member 34 forming an axial gap 98 with an end of the stator core 21 of the stator assembly 20 and an end of the bearing housing 50. The main function of the axial permanent magnet part 34 is that the axial permanent magnet part 34 has a certain suction force to the stator core 21, the bearing 40 and/or the bearing seat 50 of the stator assembly 20, and has a positioning function to the rotor assembly 30, thereby preventing the rotor assembly 30 from moving axially, and making the rotor assembly 30 not easy to shift, the utility model discloses the sound is better when the outer rotor motor operates; axial permanent magnet part 34 has another effect in addition, is the axial magnetic circuit that axial permanent magnet part 34 formed and does the utility model discloses external rotor electric machine's auxiliary magnetic circuit, with the utility model discloses external rotor electric machine's main magnetic circuit radial magnetic circuit that radial permanent magnet part 32 formed has constituted together promptly the utility model discloses external rotor electric machine's two-way magnetic circuit has improved the utility model discloses external rotor electric machine's performance makes the utility model discloses external rotor electric machine performance is more excellent.

Referring to fig. 1, the bearing 40 is an oil-impregnated bearing.

Referring to fig. 1, in order to prevent the bearing 40 from directly contacting the bottom of the bearing chamber 51 of the bearing housing 50, a first gasket 61 is disposed between the bearing 40 and the bottom of the bearing chamber 51 of the bearing housing 50.

Referring to fig. 1 and 2, in order to prevent the rotor assembly 30 from being separated, a circle of concave notch 311 is provided at the front end of the rotating shaft 31, the inner hole 611 of the first gasket 61 is clamped at the concave notch 311 of the rotating shaft 31, and generally, the first gasket 61 is an elastic gasket with a notch, so that the first gasket 61 can be clamped on the concave notch 311 of the rotating shaft 31.

Referring to fig. 1, in order to prevent the head of the rotating shaft 31 from directly contacting the bottom cavity 52 of the bearing chamber 51 of the bearing seat 50, the bottom of the bearing chamber 51 of the bearing seat 50 is further provided with a cavity 52 for accommodating the head of the rotating shaft 31, the head of the rotating shaft 31 is located in the cavity 52 of the bearing seat 50, and a second gasket 62 is further disposed between the head of the rotating shaft 31 and the bottom of the cavity 52 of the bearing seat 50. The head of the shaft 31 is generally designed in a circular arc shape so that the friction force is small when the head is slightly in contact with the second pad 62, and the rotation of the shaft 31 is not hindered.

Referring to fig. 1 and 2, the radial permanent magnet member 32 is elevated above the open end surface 3311 of the outer circumferential portion 331 of the housing 33, which facilitates adding a counterweight to the outer surface of the radial permanent magnet member 32 exposed from the outer circumferential portion 331 of the housing 33 when the rotor assembly 30 is dynamically balanced.

Referring to fig. 1 and 2, in order to fix the axial permanent magnet component 34 more firmly, a central protrusion 3329 is provided on the inner surface of the bottom 332 of the housing 33, and the axial permanent magnet component 34 is fitted over the central protrusion 3329 and then fixed on the inner surface of the bottom 332 of the housing 33.

The radial permanent magnet part 32 and the axial permanent magnet part 34 used in the present invention are magnets.

Referring to fig. 1, reference numeral 70 denotes a control circuit board, the stator winding 22 of the stator assembly 20 is electrically connected to the control circuit board 70, and the control circuit board 70 controls the operation of the external rotor electric machine of the present invention.

The above-mentioned embodiments only represent the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but it is not understood to limit the scope of the invention, it should be noted that, for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention, therefore, all the equivalent changes and modifications made with the scope of the claims of the present invention shall belong to the coverage of the claims of the present invention.

Claims

1. An outer rotor motor comprises a base plate (10), a stator assembly (20), a rotor assembly (30), a bearing (40) and a bearing seat (50); the stator assembly (20) comprises a stator core (21) and stator windings (22) arranged in each stator slot of the stator core (21); the rotor assembly (30) comprises a rotating shaft (31), a radial permanent magnet component (32) and a concave cylindrical shell (33), wherein the radial permanent magnet component (32) is fixed on the inner wall of the outer circumferential part (331) of the shell (33), and two ends of the rotating shaft (31) are fixed on a central through hole (3321) of the bottom (332) of the shell (33) in a hanging manner; the front end of the bearing seat (50) is fixed in a first through hole (11) of the bottom plate (10), the rear end of the bearing seat (50) is suspended and fixed with the stator assembly (20), and the bearing (40) is fixed in a bearing chamber (51) of the bearing seat (50); the front end of the rotating shaft (31) is arranged in an inner hole of the bearing (40), and a radial gap (99) is formed between a stator core (21) of the stator assembly (20) and a radial permanent magnet component (32) of the rotor assembly (30); the method is characterized in that:

the rotor assembly (30) further comprises an axial permanent magnet component (34), the axial permanent magnet component (34) is fixed on the inner surface of the bottom (332) of the housing (33), and an axial gap (98) is formed between the axial permanent magnet component (34) and the end of the stator core (21) of the stator assembly (20) and the end of the bearing seat (50).

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

the bearing (40) is an oil bearing.

3. The external rotor electric machine of claim 1, wherein:

a first gasket (61) is arranged between the bearing (40) and the bottom of the bearing chamber (51) of the bearing seat (50).

4. The external rotor electric machine of claim 3, wherein:

the front end of the rotating shaft (31) is provided with a circle of concave gap (311), and an inner hole (611) of the first gasket (61) is clamped at the concave gap (311) of the rotating shaft (31).

5. The external rotor electric machine of claim 1, wherein:

the bottom of the bearing chamber (51) of the bearing seat (50) is also provided with a containing cavity (52) for containing the head of the rotating shaft (31), the head of the rotating shaft (31) is positioned in the containing cavity (52) of the bearing seat (50), and a second gasket (62) is also arranged between the head of the rotating shaft (31) and the bottom of the containing cavity (52) of the bearing seat (50).

6. The external rotor electric machine of claim 1, wherein:

the radial permanent magnet member (32) is raised above an opening end surface (3311) of an outer circumferential portion (331) of the housing (33).

7. The external rotor electric machine according to any of claims 1-6, wherein:

the inner surface of the bottom (332) of the shell (33) is provided with a central convex column (3329), and the axial permanent magnet component (34) is sleeved on the central convex column (3329) and then fixed on the inner surface of the bottom (332) of the shell (33).