CN112383172A

CN112383172A - Electric machine

Info

Publication number: CN112383172A
Application number: CN202011250399.0A
Authority: CN
Inventors: 周亚运; 吕琢; 李德生; 张兵
Original assignee: Foshan Welling Washer Motor Manufacturing Co Ltd; Huaian Welling Motor Manufacturing Co Ltd
Current assignee: Foshan Welling Washer Motor Manufacturing Co Ltd; Huaian Welling Motor Manufacturing Co Ltd
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2021-02-19

Abstract

The invention discloses a motor, which comprises a shell, a rotor assembly and an end cover, wherein at least part of the rotor assembly is arranged in the shell, the rotor assembly comprises a rotating shaft and a plurality of fan blades, the fan blades are connected with the rotating shaft, the end cover is arranged at the end part of the shell, an accommodating cavity is arranged in the end cover, the rotating shaft is rotatably arranged on the end cover in a penetrating way and at least part of the rotating shaft is positioned in the accommodating cavity, a second end of the end cover is provided with a first through hole, the first through hole is communicated with the accommodating cavity, the first through holes are arranged in a plurality manner that the first through holes are arranged at intervals along the circumferential direction of the rotating shaft, the inner wall surface of the first through hole comprises a first inner wall surface and a second inner wall surface which are oppositely arranged in the inner and outer directions, the first inner wall surface is positioned at the outer side of the second inner, the projection of the outer side surface of the fan blade is located in the projection of the first inner wall surface in the inner and outer directions. The motor has good heat dissipation effect.

Description

Electric machine

Technical Field

The invention relates to the technical field of motors, in particular to a motor.

Background

The single-phase induction motor for the washing machine is provided with fan blades at the end of a rotor to form a centrifugal fan. When the fan rotates, gas in the motor can exchange with the outside through the through hole and the air gap in the middle of the rotor and the through hole in the end face of the end cover, and therefore the temperature inside the motor is reduced. However, since the fan blades are provided at the end of the rotor, the size and position thereof are limited.

In the related art, the vent holes are formed in the end face or the side wall of the end cover, when the motor runs, the air flow inside the motor is greatly subjected to air channel resistance of the vent holes, and the air volume is small and the heat dissipation effect of the motor is poor due to the fact that the fan blades rotate at the designed rotating speed and cannot overcome the air channel resistance.

Disclosure of Invention

Therefore, the embodiment of the invention provides the motor which is good in heat dissipation effect.

An electric machine according to an embodiment of the present invention includes: a housing; the rotor assembly is at least partially arranged in the shell and comprises a rotating shaft and a plurality of fan blades, the fan blades are connected with the peripheral wall of the rotating shaft, and the fan blades are arranged at intervals along the circumferential direction of the rotating shaft; the end cover is arranged at the end part of the shell, an accommodating cavity is formed in the end cover, a first end of the end cover is opened to enable a first end opening of the accommodating cavity, the rotating shaft is rotatably arranged on the end cover in a penetrating mode and at least partially located in the accommodating cavity, a second end of the end cover is provided with a first through hole, the first through hole is communicated with the accommodating cavity, the first through holes are multiple and are arranged at intervals along the circumferential direction of the rotating shaft, the inner wall face of each first through hole comprises a first inner wall face and a second inner wall face which are oppositely arranged in the inner and outer directions, the first inner wall face is located on the outer side of the second inner wall face, the projection of the outer side face of the fan blade is located in the projection of the first inner wall face in the inner and outer directions, and the first through hole is orthogonal to the projection face of the rotating shaft.

According to the motor provided by the embodiment of the invention, the second end of the end cover is provided with the plurality of first ventilation holes, and on the projection plane orthogonal to the axial direction of the rotating shaft, the projection of the outer side surface of the fan blade is positioned in the projection of the first inner wall surface of the first ventilation hole in the inner and outer directions. When the motor works, the rotating shaft in the motor drives the fan blades to rotate, the fan blades can drive the surrounding air to flow when rotating, therefore, the air can be directly sucked into the motor through the first through hole, in other words, the air flow outside the motor can not be blocked by the inner wall surface of the first through hole and can directly enter the motor, so that the air duct resistance is reduced, and the heat dissipation effect inside the motor is improved.

In some embodiments, the outer side surfaces of the plurality of blades are on the same first circumferential surface, the radius of the first circumferential surface is R1, the first inner wall surface is an arc surface, and the first inner wall surfaces of the plurality of first through holes are on the same second circumferential surface, the radius of the second circumferential surface is R1, and R1 < R1.

In some embodiments, the second inner wall surface is an arc surface, and the second inner wall surfaces of the first through holes are on the same third circumferential surface, and the radius of the third circumferential surface is R2, R2 < R1 < R1.

In some embodiments, the cross-section of the fan blade has a straight line shape, a curved line shape or a multi-segment zigzag line shape.

In some embodiments, the second end of the end cover is provided with a plurality of second through holes, the second through holes are communicated with the accommodating cavity, and the plurality of second through holes are arranged at intervals along the circumferential direction of the rotating shaft.

In some embodiments, the second through hole is located outside the first through hole in the inward-outward direction.

In some embodiments, the end cap includes a peripheral wall and a bottom wall, the peripheral wall encloses the accommodating cavity, the bottom wall is disposed at a first end of the peripheral wall to close one end of the accommodating cavity, the first through hole is disposed on the bottom wall, a third through hole is disposed on the peripheral wall, the third through hole is plural, and the third through holes are spaced apart from each other in a circumferential direction of the rotating shaft.

In some embodiments, the end face of the second end of the end cover is provided with a plurality of convex hulls, and the plurality of convex hulls and the first through holes are staggered and arranged at intervals along the circumferential direction of the rotating shaft.

In some embodiments, the motor further includes a stator assembly including a stator core having a rotor cavity therein, the rotor assembly further includes a rotor core fitted in the rotor cavity, the rotating shaft is disposed through the rotor core and coaxially disposed with the rotor core, and the fan blades are disposed at an end of the rotor core.

In some embodiments, the rotor assembly further includes a first end ring and a second end ring, the first end ring is disposed at the first end of the rotor core, the second end ring is disposed at the second end of the rotor core, the fan blades include a plurality of first fan blades and a plurality of second fan blades, the first fan blades are connected to the first end ring, the plurality of first fan blades are arranged along the circumferential direction of the first end ring, the second fan blades are connected to the second end ring, and the plurality of second fan blades are arranged along the circumferential direction of the second end ring.

In some embodiments, the end caps include a first end cap and a second end cap, the first end cap and the second end cap both have the accommodating cavity and are provided with the first through hole, the first end cap is mounted at the first end of the stator core, the second end cap is mounted at the second end of the stator core, the first end of the rotating shaft penetrates through the first end cap and is rotatably connected with the first end cap, and the second end of the rotating shaft is rotatably connected with the second end cap.

In some embodiments, the first end cover includes a body and a plurality of mounting feet, the accommodating cavity is formed in the body, the first end of the body is open, the mounting feet are formed at the first end of the body, the mounting feet extend outwards from the outer peripheral surface of the first end cover, mounting holes penetrating through the mounting feet along the axial direction of the rotating shaft are formed in the mounting feet, and the mounting holes are arranged at intervals along the circumferential direction of the end cover.

Drawings

Fig. 1 is an exploded view of a motor according to an embodiment of the present invention.

Fig. 2 is a sectional view of a motor according to an embodiment of the present invention.

Fig. 3 is a schematic view of a first end cap of an electric machine of an embodiment of the invention.

Fig. 4 is a bottom view of the first end cap of fig. 3.

Fig. 5 is a schematic view of a second end cap of an electric machine of an embodiment of the invention.

Fig. 6 is a schematic view of a rotor assembly of an electric machine according to an embodiment of the present invention.

Fig. 7 is a top view of the rotor assembly of fig. 6.

Fig. 8 is a schematic view of a stator core of an electric machine according to an embodiment of the present invention.

Fig. 9 is a top view of the stator core of fig. 8.

Reference numerals:

1. end cover, 11, first end cover; 12. a second end cap; 111. a body; 112. a first through hole; 1111. a second circumferential surface; 1112. a third circumferential surface; 1113. a first inner wall surface; 1114. a second inner wall surface; 113. a second through hole; 114. a third through hole; 115. an accommodating chamber; 1151. a bottom wall; 1152. a peripheral wall; 116. mounting a foot; 1161. mounting holes; 117. a convex hull;

2. a rotor assembly; 21. a rotor core; 211. a first end ring; 212. a second end ring; 22. a rotating shaft; 23. a fan blade; 231. a first fan blade; 232. a second fan blade; 233. a first circumferential surface; 234. a fourth circumferential surface;

3. a stator assembly; 31. a stator core; 32. a rotor cavity;

4. a housing.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A motor according to an embodiment of the present invention is described below with reference to fig. 1 to 9.

As shown in fig. 1 to 5, the motor according to the embodiment of the present invention includes a housing 4, an end cap 1 and a rotor assembly 2, at least a portion of the rotor assembly 2 is disposed in the housing 4, the rotor assembly 2 includes a rotating shaft 22 and a plurality of blades 23, wherein the plurality of blades 23 are connected to a peripheral wall of the rotating shaft 22, and the plurality of blades 23 are spaced apart from each other along a circumferential direction of the rotating shaft 22.

The end cap 1 is disposed at an end portion of the housing 4, the end cap 1 has a receiving cavity 115 therein, and a first end (e.g., a lower end of the end cap 1 in fig. 3) of the end cap 1 is open so that the first end (e.g., a lower end of the receiving cavity 115 in fig. 3) of the receiving cavity 115 is open. The rotating shaft 22 is rotatably disposed on the end cover 1 along an axial direction (e.g., up and down direction in fig. 2) and at least partially located in the accommodating cavity 115.

As shown in fig. 3 and 4, a second end of the endcap 1 (e.g., the upper end of the endcap 1 in fig. 3) is provided with a first through hole 112, the first through hole 112 is communicated with the accommodating cavity 115, the inner wall surface of the first through hole 112 includes a first inner wall surface 1113 and a second inner wall surface 1114 that are oppositely arranged in the inner and outer directions, the first inner wall surface 1113 is located outside the second inner wall surface 1114, the number of the first through holes 112 is multiple, and the multiple first through holes 112 are arranged at intervals in the circumferential direction of the rotating shaft 22.

On a projection plane orthogonal to the axial direction of the rotation shaft 22 (vertical direction in fig. 2), a projection of the outer side surface of the fan blade 23 is located within a projection of the first inner wall surface 1113 in the inward and outward direction.

As shown in fig. 3, the inside-out direction in the "inside-outside direction" is: a direction extending outward in a radial direction from the center of the end cap 1, "outward-inward direction" is: a direction extending from the outer periphery of the end cap 1 toward the center of the end cap 1 in the radial direction thereof.

According to the motor provided by the embodiment of the invention, when the motor works, the rotating shaft 22 in the motor drives the fan blades 23 to rotate, and the fan blades 23 can drive the ambient air to flow when rotating, so that the air can be directly sucked into the motor through the first through holes 112, in other words, the air flow outside the motor can directly enter the motor without being blocked by the inner wall surfaces of the first through holes 112, thereby reducing the air duct resistance and improving the heat dissipation effect inside the motor.

Alternatively, as shown in fig. 4, the number of the first through holes 112 is four, the four first through holes 112 are arranged at equal intervals along the circumferential direction of the rotating shaft 22, the outer circumferential profile of the cross section of the first through holes 112 is a sector, the curved surface of the first through holes 112 adjacent to the center of the accommodating cavity 115 is a first inner wall surface 1113, and the curved surface of the first through holes 112 away from the center of the accommodating cavity 115 is a second inner wall surface 1114.

In some embodiments, as shown in fig. 4 and 7, the outer side surfaces of the plurality of fan blades 23 are on the same first circumferential surface 233, the radius of the first circumferential surface 233 is R1, the first inner wall surface 1113 is an arc surface, the first inner wall surfaces 1113 of the plurality of first through holes 112 are on the same second circumferential surface 1111, the radius of the second circumferential surface 1111 is R1, and R1 < R1.

Further, as shown in fig. 3 and 4, the second inner wall surface 1114 is an arc surface, and the second inner wall surfaces 1114 of the plurality of first through holes 112 are on the same third circumferential surface 1112, and the radius of the third circumferential surface 1112 is R2, R2 < R1 < R1. It will be appreciated that the first circumferential surface 233 is located within the area bounded by the second circumferential surface 1111 and the third circumferential surface 1112.

Preferably, as shown in fig. 4, 6 and 7, the inner side surfaces of the plurality of fan blades 23 are on the same fourth circumferential surface 234, the radius of the fourth circumferential surface 234 is R2, R2 < R2 < R1. In other words, the first circumferential surface 233 and the fourth circumferential surface 234 are both located within the area enclosed by the second circumferential surface 1111 and the third circumferential surface 1112. It can be understood that, under the condition that the end cover 1 meets the strength requirement, the first circumferential surface 233 defined by the first through hole 112 is as large as possible, and the fourth circumferential surface 234 defined by the first through hole 112 is as small as possible, so that the area of the first through hole 112 is large enough, and further the air intake rate inside the motor is increased, and the heat dissipation effect of the motor is improved.

In some embodiments, as shown in fig. 3 and 5, the second end of the end cap 1 is provided with a second through hole 113, the second through hole 113 is communicated with the accommodating cavity 115, the second through hole 113 is multiple, and the multiple second through holes 113 are arranged at intervals along the circumferential direction of the rotating shaft 22. Specifically, the second through hole 113 is located outside the first through hole 112 in the inward and outward direction. According to the motor provided by the embodiment of the invention, the second through hole 113 is arranged, so that the ventilation quantity in the motor can be further improved, and the heat dissipation effect of the motor is improved. Further, according to the motor of the embodiment of the present invention, the strength of the end cap 1 can be improved to some extent by locating the second through hole 113 outside the first through hole 112 in the inward and outward direction.

Further, as shown in fig. 3 and 5, the end cap 1 includes a bottom wall 1151 and a peripheral wall 1152, the peripheral wall 1152 surrounds the accommodating chamber 115, the bottom wall 1151 is provided at a first end of the peripheral wall 1152 (e.g., an upper end of the peripheral wall 1152 in fig. 3) to close one end of the accommodating chamber 115, and the first through hole 112 is provided in the bottom wall. The peripheral wall 1152 is provided with a plurality of third through holes 114, and the plurality of third through holes 114 are arranged at intervals along the circumferential direction of the rotating shaft 22. According to the motor of the embodiment of the invention, the air intake amount inside the motor is further increased by providing the plurality of third through holes 114 on the peripheral wall 1152.

In some embodiments, as shown in fig. 3 and 5, the end surface of the second end of the end cover 1 is provided with a plurality of convex hulls 117, and the plurality of convex hulls 117 and the first through holes 112 are staggered and equally spaced along the circumferential direction of the rotating shaft 22. Specifically, a threaded hole is formed through the convex hull 117, and a connecting member is adapted to pass through the threaded hole to connect the end cap 1 with other components.

In some embodiments, as shown in fig. 1, 2, and 6 to 9, the motor further includes a stator assembly 3, the stator assembly 3 includes a stator core 31 and windings (not shown in the drawings), the windings are provided on a peripheral wall of the stator core 31, and the stator core 31 has a rotor cavity 32 therein. Rotor subassembly 2 still includes rotor core 21, and rotor core 21 cooperation is in rotor cavity 32, and pivot 22 wears to establish on rotor core 21 and arranges with rotor core 21 is coaxial, and flabellum 23 is established at rotor core 21's tip.

Specifically, as shown in fig. 6, the rotor assembly 2 further includes a first end ring 211 and a second end ring 212, the first end ring 211 is disposed at the first end of the rotor core 21, the second end ring 212 is disposed at the second end of the rotor core 21, the fan blade 23 includes a first fan blade 231 and a second fan blade 232, and the first fan blade 231 and the second fan blade 232 are both plural. The first blade 231 is connected to the first end ring 211, the plurality of first blades 231 is arranged along the circumferential direction of the first end ring 211, the second blade 232 is connected to the second end ring 212, and the plurality of second blades 232 is arranged along the circumferential direction of the second end ring 212.

Further, the cross-sectional area of the first blade 231 in the direction away from the first end ring 211 gradually decreases, and the cross-sectional area of the second blade 232 in the direction away from the second end ring 212 gradually decreases, so that the first blade 231 and the second blade 232 can be easily demolded during the manufacturing process.

Alternatively, as shown in fig. 6 and 7, the outer circumferential profile of the cross section of the first blade 231 and the outer circumferential profile of the cross section of the second blade 232 may be linear, curved, or multi-segment zigzag.

Alternatively, the outer peripheral profile of the cross section of the fan blade 23 is linear, for example, the outer peripheral profile of the cross section of the fan blade 23 is rectangular, and may be approximately linear due to the small thickness of the fan blade 23.

Alternatively, as shown in fig. 7, the outer peripheral profile of the cross section of the fan blade 23 is a curved shape, for example, the outer peripheral profile of the cross section of the fan blade 23 is a fan shape, and may be approximated to a circular arc shape due to the small thickness of the fan blade 23.

Alternatively, the outer contour of the cross section of the fan blade 23 is a multi-segment zigzag shape, for example, the outer contour of the cross section of the fan blade 23 is composed of a plurality of rectangular segments, the plurality of rectangular segments includes a first segment and a second segment, the first segment is connected with the second segment, and an included angle is formed between the first segment and the second segment.

In some embodiments, as shown in fig. 1 and 2, the end cap 1 includes a first end cap 11 and a second end cap 12, each of the first end cap 11 and the second end cap 12 has a receiving cavity 115 and is provided with a first through hole 112, the first end cap 11 is mounted to a first end of the stator core 31 (e.g., an upper end of the stator core 31 in fig. 1), and the second end cap 12 is mounted to a second end of the stator core 31 (e.g., a lower end of the stator core 31 in fig. 1).

A first end of the shaft 22 (e.g., an upper end of the shaft 22 in fig. 1) penetrates the first end cap 11 and is rotatably connected to the first end cap 11, and a second end of the shaft 22 (e.g., a lower end of the shaft 22 in fig. 1) is rotatably connected to the second end cap 12. Therefore, according to the motor of the embodiment of the present invention, the first end cap 11 and the second end cap 12 may provide a rotational support function for the rotation shaft 22.

Further, as shown in fig. 3 and 4, the first end cover 11 includes a body 111 and a mounting leg 116, the accommodating cavity 115 is disposed in the body 111, the first end of the body 111 is disposed in an open manner, the mounting leg 116 is disposed at the first end of the body 111 (e.g., the lower end of the body 111 in fig. 3), the mounting leg 116 extends outward from the outer peripheral surface of the first end cover 11, a mounting hole 1161 penetrating the mounting leg 116 along the axial direction of the rotating shaft 22 is disposed on the mounting leg 116, a bolt capable of being connected to the stator core 31 is mounted in the mounting hole 1161, the mounting holes 1161 are plural, the plural mounting holes 1161 are arranged at intervals along the circumferential direction of the end cover 1, and according to the motor of the embodiment of the present invention, by providing the plural mounting holes 1161 arranged at intervals along the circumferential direction of the end cover 1, the connection strength between the first end cover 11 and the stator core 31.

A motor according to some specific examples of the invention is described below with reference to the accompanying drawings.

As shown in fig. 1 to 9, the motor includes an end cap 1, a stator assembly 3, a rotor assembly 2, and a housing 4. The end cap 1 includes a first end cap 11 and a second end cap 12, the stator assembly 3 includes a stator core 31, and the rotor assembly 2 includes a rotating shaft 22, a rotor core 21, windings, a first end ring 211, a second end ring 212, a first fan blade 231, and a second fan blade 232.

As shown in fig. 2, the stator core 31 is located in the housing 4, the first end cap 11 is mounted on the upper end of the stator core 31 and connected to the upper end of the housing 4, and the second end cap 12 is mounted on the lower end of the stator core 31 and connected to the lower end of the housing 4. Part of the shaft is located within the housing 4. The upper end of the rotating shaft 22 penetrates through the first end cap 11 and is rotatably connected with the first end cap 11, and the lower end of the rotating shaft 22 is rotatably connected with the second end cap 12. The windings are provided on the peripheral wall of the stator core 31, the stator core 31 has a rotor cavity 32 therein, and the rotor core 21 is fitted in the rotor cavity 32. The first end cap 11, the second end cap 12, the stator core 31, and the rotating shaft 22 are all located on the same axis.

As shown in fig. 1 and 2, each of the first and second end caps 11 and 12 has a receiving cavity 115, and the stator assembly 3 and the rotor assembly 2 are mounted in the receiving cavity 115. The first end cap 11 and the second end cap 12 are each provided with a first through hole 112, and the first through hole 112 communicates with the accommodating chamber 115. Specifically, as shown in fig. 1 and 2, the upper end of the first end cap 11 has a plurality of first through holes 112, and the lower end of the second end cap 12 has a plurality of first through holes 112.

As shown in fig. 3 to 5, in the first and second end caps 11 and 12, the plurality of first through holes 112 are each arranged at intervals in the circumferential direction of the rotating shaft 22, and the inner wall surfaces of the first through holes 112 include a first inner wall surface 1113 and a second inner wall surface 1114 that are arranged opposite to each other in the radial direction of the housing chamber 115, the first inner wall surface 1113 being located outside the second inner wall surface. It is understood that first inner wall surface 1113 is an outer contour surface defined by the first plurality of through holes 112, and second inner wall surface 1114 is an inner contour surface defined by the first plurality of through holes 112.

As shown in fig. 6, a first end ring 211 is provided at the upper end of the rotor core 21, and a second end ring 212 is provided at the lower end of the rotor core 21. The first fan blade 231 and the second fan blade 232 are both plural. The first blade 231 is connected to the peripheral wall of the first end ring 211, and the plurality of first blades 231 are arranged along the circumferential direction of the first end ring 211, the second blade 232 is connected to the peripheral wall of the second end ring 212, and the plurality of second blades 232 are arranged along the circumferential direction of the second end ring 212.

The cross-sectional area of the first blade 231 decreases gradually along the direction away from the first end ring 211, the cross-sectional area of the second blade 232 decreases gradually along the direction away from the second end ring 212, the cross-sections of the first blade 231 and the second blade 232 are both fan-shaped, and the sizes of the first blade 231 and the second blade 232 are the same.

As shown in fig. 4, on a projection plane orthogonal to the vertical direction of the rotation shaft 22, projections of the outer side surfaces of the first blade 231 and the second blade 232 are located within projections of the first inner wall surfaces in the inward and outward directions.

As shown in fig. 4 and 7, the outer side surfaces of the first blade 231 and the second blade 232 are on the same first circumferential surface 233, the radius of the first circumferential surface 233 is R1, the first inner wall surface 1113 is an arc surface, the first inner wall surfaces 1113 of the plurality of first through holes 112 are on the same second circumferential surface 1111, the radius of the second circumferential surface 1111 is R1, and R1 < R1.

As shown in fig. 4, the second inner wall surface 1114 is an arc surface, the second inner wall surfaces 1114 of the plurality of first through holes 112 are on the same third circumferential surface 1112, the radius of the third circumferential surface 1112 is R2, R2 < R1 < R1. It will be appreciated that the first circumferential surface 233 is located within the area bounded by the second circumferential surface 1111 and the third circumferential surface 1112.

As shown in fig. 4 and 7, the inner side surfaces of the first blade 231 and the second blade 232 are located on the same fourth circumferential surface 234, the radius of the fourth circumferential surface 234 is R2, R2 < R2 < R1. In other words, the first circumferential surface 233 and the fourth circumferential surface 234 are both located within the area enclosed by the second circumferential surface 1111 and the third circumferential surface 1112. It can be understood that, under the condition that the end cover 1 meets the strength requirement, the first circumferential surface 233 defined by the first through hole 112 is as large as possible, and the fourth circumferential surface 234 defined by the first through hole 112 is as small as possible, so that the area of the first through hole 112 is large enough, and further the air intake rate inside the motor is increased, and the heat dissipation effect of the motor is improved.

As shown in fig. 3 and 4, the first end cap 11 includes a body 111 and a mounting leg 116, the receiving cavity 115 is provided in the body 111, and the first end of the body 111 is open, the mounting leg 116 is provided at the lower end of the body 111, and the mounting leg 116 extends outward from the outer peripheral surface of the first end cap 11, it can be understood that, as shown in fig. 3, the body 111 is a cylindrical structure with the upper end closed and the lower end open, the mounting leg 116 extends outward from the outer periphery of the lower end of the body 111 in the radial direction of the body, and the outer profile of the mounting leg 116 is substantially triangular.

As shown in fig. 3 and 4, the mounting leg 116 is provided with a plurality of mounting holes 1161 penetrating through the mounting leg 116 in the axial direction of the rotating shaft 22, bolts capable of being connected with the stator core 31 are installed in the mounting holes 1161, and the plurality of mounting holes 1161 are arranged at intervals in the circumferential direction of the end cover 1.

As shown in fig. 1 and 2, the upper end of the first end cover 11 and the lower end of the second end cover 12 are both provided with a second through hole 113, the second through hole 113 is communicated with the accommodating cavity 115, the second through holes 113 are multiple, and the multiple second through holes 113 are arranged at intervals along the circumferential direction of the rotating shaft 22. Specifically, the second through hole 113 is located outside the first through hole 112 in the inward and outward direction. According to the motor provided by the embodiment of the invention, the second through hole 113 is arranged, so that the ventilation quantity in the motor can be further improved, and the heat dissipation effect of the motor is improved. And the second through hole 113 is located outside the first through hole 112 in the inward and outward direction, the strength of the end cap 1 can be improved to some extent.

As shown in fig. 1 and 2, the side walls of the first end cap 11 and the second end cap 12 are respectively provided with a plurality of third ventilation holes 114, and the plurality of third ventilation holes 114 are arranged at intervals along the circumferential direction of the rotating shaft 22.

As shown in fig. 3 and 5, the upper end surface of the first end cap 11 and the lower end surface of the second end cap 12 are both provided with a plurality of convex hulls 117, the convex hulls 117 and the first through holes 112 are staggered and equally spaced along the circumferential direction of the rotating shaft 22, and threaded holes are formed through the convex hulls 117 for matching the motor with other parts.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are 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 the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. An electric machine, comprising:

a housing;

the rotor assembly is at least partially arranged in the shell and comprises a rotating shaft and a plurality of fan blades, the fan blades are connected with the peripheral wall of the rotating shaft, and the fan blades are arranged at intervals along the circumferential direction of the rotating shaft;

the end cover is arranged at the end part of the shell, an accommodating cavity is arranged in the end cover, a first end of the end cover is arranged in an open mode so that a first end opening of the accommodating cavity is formed, the rotating shaft is rotatably arranged on the end cover in a penetrating mode and at least partially located in the accommodating cavity, a second end of the end cover is provided with a first through hole, the first through hole is communicated with the accommodating cavity, the first through holes are arranged in a plurality and are arranged at intervals along the circumferential direction of the rotating shaft, the inner wall surface of each first through hole comprises a first inner wall surface and a second inner wall surface which are oppositely arranged in the inner and outer directions, and the first inner wall surface is located on the outer side of the second inner wall surface,

on a projection plane orthogonal to the axial direction of the rotating shaft, the projection of the outer side surface of the fan blade is positioned in the projection of the first inner wall surface in the inner and outer directions.

2. The electric machine of claim 1 wherein the outer sides of the plurality of fan blades are on the same first circumferential surface, the first circumferential surface has a radius R1, the first inner wall surface is an arcuate surface, and the first inner wall surfaces of the plurality of first through holes are on the same second circumferential surface, the second circumferential surface has a radius R1, and R1 < R1.

3. The electric machine of claim 2, wherein the second inner wall surface is an arcuate surface and the second inner wall surfaces of the first plurality of through holes are on a common third circumferential surface having a radius R2, R2 < R1 < R1.

4. The electric machine of claim 2 wherein said inner faces of said plurality of fan blades are on a common fourth circumferential face, said fourth circumferential face having a radius R2, R2 < R2 < R1.

5. The motor of claim 1, wherein the cross-section of the fan blades has a peripheral contour that is linear, curved, or multi-segment dogleg.

6. The electric machine of claim 1, wherein the second end of the end cover is provided with a plurality of second through holes, the second through holes are communicated with the accommodating cavity, and the plurality of second through holes are arranged at intervals along the circumferential direction of the rotating shaft.

7. The electric machine of claim 6, wherein the second through hole is located outside the first through hole in the inward-outward direction.

8. The electric machine according to claim 1, wherein the end cap includes a peripheral wall and a bottom wall, the peripheral wall encloses the accommodating chamber, the bottom wall is provided at a first end of the peripheral wall to close one end of the accommodating chamber, the first through hole is provided in the bottom wall, a third through hole is provided in the peripheral wall, the third through hole is plural, and the plural third through holes are arranged at intervals in a circumferential direction of the rotating shaft.

9. The motor of claim 1, wherein the end surface of the second end of the end cover is provided with a plurality of convex hulls, and the convex hulls and the first through holes are staggered and spaced along the circumferential direction of the rotating shaft.

10. The electric machine of any of claims 1 to 9, further comprising a stator assembly comprising a stator core having a rotor cavity therein,

the rotor subassembly still includes rotor core, rotor core cooperation is in the rotor intracavity, the pivot is worn to establish on the rotor core and with rotor core coaxial arrangement, the flabellum is established rotor core's tip.

11. The electric machine of claim 10 wherein the rotor assembly further comprises a first end ring and a second end ring, the first end ring disposed at a first end of the rotor core and the second end ring disposed at a second end of the rotor core, the fan blades comprising a first fan blade and a second fan blade, the first fan blade and the second fan blade each being a plurality,

the first fan blade is connected with the first end ring, the first fan blades are arranged along the circumferential direction of the first end ring, the second fan blade is connected with the second end ring, and the second fan blades are arranged along the circumferential direction of the second end ring.

12. The electric machine of claim 10, wherein the end caps comprise a first end cap and a second end cap, the first end cap and the second end cap each have the receiving cavity and are each provided with the first through hole, the first end cap is mounted at the first end of the stator core, the second end cap is mounted at the second end of the stator core, the first end of the rotating shaft penetrates through the first end cap and is rotatably connected with the first end cap, and the second end of the rotating shaft is rotatably connected with the second end cap.

13. The electric machine of claim 12, wherein the first end cap includes a body and a plurality of mounting feet, the accommodating cavity is formed in the body, the first end of the body is open, the mounting feet are formed at the first end of the body, the mounting feet extend outwards from the outer peripheral surface of the first end cap, mounting holes penetrating through the mounting feet along the axial direction of the rotating shaft are formed in the mounting feet, and the mounting holes are arranged at intervals along the circumferential direction of the end cap.