CN213959877U - Motor end cover, stator structure and motor - Google Patents

Abstract

The embodiment of the application provides a motor end cover, a stator structure and a motor. The motor end cover is provided with a bearing chamber capable of placing a bearing; the inner wall of the bearing chamber has a support portion in line contact with an outer ring of the bearing. Therefore, the bearing chamber can be contacted with part of the outer wall of the bearing through the supporting part, the roundness and the surface roughness can meet the matching requirement of the bearing, the motor runs stably, the vibration and the noise during running are reduced, and the service life of the motor can be prolonged and the reliability is improved; in addition, the processing procedure and the production cost are correspondingly reduced, and the production efficiency can be improved.

Description

Motor end cover, stator structure and motor

Technical Field

The application relates to the technical field of motors, in particular to a motor end cover, a stator structure and a motor.

Background

Electric motors have been widely used in various industries, such as in the household appliance industry, including washing machines, air conditioners, dishwashers, and the like. The motor can adopt the structure of a front aluminum end cover, a middle stator core and a rear aluminum end cover. With the development of the technology, the structure of an integrated stator core/front end cover and a rear aluminum end cover appears at present; the integrated stator core/front end cover puts the stator core into a die cavity in advance, so that the plastic front end cover obtained by injection molding is combined with the stator core into a whole. However, in this solution, the front end cover is made of conventional aluminum material instead of plastic, and the roundness and surface roughness of the bearing chamber of the molded plastic front end cover cannot meet the requirement of matching with the bearing.

One solution is to embed a cylindrical thin steel sleeve in a plastic bearing chamber, so that a steel sleeve and a stator core which are put into a die cavity in advance are injection molded together with a front end cover, and after the motor is assembled, a rotor bearing is matched with the embedded steel sleeve; the roundness and the surface roughness of the bearing chamber after the steel sleeve is increased can meet the matching requirement of the bearing. However, due to the positioning error of the steel sleeve and the die cavity, the coaxiality error of the inner diameter of the molded steel sleeve and the inner diameter of the spigot exceeds the required tolerance, the vibration and the noise are increased when the motor runs, and the service life and the reliability of the motor are adversely affected. In addition, the machining process and the production cost are increased correspondingly after the steel sleeve is added, and the production efficiency is reduced.

It should be noted that the above background description is provided only for the sake of clarity and complete description of the technical solutions of the present application, and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present application.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one of the above problems, embodiments of the present application provide a motor end cover, a stator structure, and a motor.

According to an aspect of an embodiment of the present application, there is provided a motor end cover having a bearing chamber in which a bearing can be placed; the inner wall of the bearing chamber has a support portion in line contact with an outer ring of the bearing.

Therefore, the bearing chamber can be contacted with part of the outer wall of the bearing through the supporting part, the roundness and the surface roughness can meet the matching requirement of the bearing, the motor runs stably, the vibration and the noise during running are reduced, and the service life of the motor can be prolonged and the reliability is improved; in addition, the processing procedure and the production cost are correspondingly reduced, and the production efficiency can be improved.

In some embodiments, there are a plurality of support portions in the bearing chamber that mate with the outer race of the bearing; the supporting parts are distributed at equal intervals along the circumferential direction of the bearing chamber; each of the support portions is in line contact with an outer ring of the bearing with the bearing inserted into the bearing chamber. Therefore, the rotor bearing can be further stably supported, and the stability of the motor operation is improved.

In some embodiments, the number of the supporting parts is 5 to 21. From this, through a plurality of supporting parts of line contact, can further easy to assemble, not only circularity and roughness can satisfy the cooperation requirement with the bearing, and the motor operation is stable moreover.

In some embodiments, a cross-section of the inner wall of the bearing chamber taken along the radial direction has a polygonal shape, and a central portion of each side of the polygonal shape forms the supporting portion. Therefore, the processing procedure can be further simplified, the production cost can be reduced, and the production efficiency can be further improved.

In some embodiments, the polygon is an equilateral 13-sided polygon. Therefore, the matching between the motor operation and the bearing chamber can be optimized, and the stability of the motor operation is further improved.

In some embodiments, the inner wall of the bearing chamber further has a connecting portion that is not in contact with the outer ring of the bearing, the connecting portion being located between adjacent two of the support portions; the connecting portion is formed at a certain angle or in an arc shape on a cross section cut along the radial direction of the bearing chamber. Therefore, the requirements of the production process can be reduced, the processing procedures can be simplified, and the production efficiency can be further improved.

In some embodiments, the support portion is a convex structure protruding radially inward from an inner wall of the bearing chamber, and/or the connection portion is a concave structure recessed radially outward from the inner wall of the bearing chamber. Therefore, the processing procedure can be further simplified, the production cost can be reduced, and the production efficiency can be further improved.

In some embodiments, the motor end cap is a plastic component that is integrally molded by injection molding. Therefore, the processing procedure can be further simplified, the production cost can be reduced, and the production efficiency can be further improved.

According to another aspect of the embodiments of the present application, there is provided a stator structure, including a first end cover and a stator, the first end cover having a bearing chamber in which a rotor bearing can be placed; the first end cover and the stator core are integrally formed through injection molding; the inner wall of the bearing chamber of the first end cover has a support portion in line contact with the outer ring of the rotor bearing and a connection portion not in contact with the outer ring of the rotor bearing.

Therefore, the bearing chamber can be contacted with part of the outer wall of the rotor bearing through the supporting part, the roundness and the surface roughness can meet the matching requirement of the bearing, the motor runs stably, the vibration and the noise during running are reduced, and the service life of the motor can be prolonged and the reliability is improved; in addition, the processing procedure and the production cost are correspondingly reduced, and the production efficiency can be improved.

According to another aspect of embodiments of the present application, there is provided a motor including:

a stator structure comprising a first end cap and a stator, the first end cap having a bearing chamber in which a rotor bearing can be placed; the first end cover and the stator core are integrally formed through injection molding;

a rotor arranged radially inside the stator; and

a second end cover supporting the rotor in cooperation with the stator structure;

wherein an inner wall of the bearing chamber of the first end cover has a support portion in line contact with an outer ring of the rotor bearing and a connection portion not in contact with the outer ring of the rotor bearing.

Therefore, the bearing chamber can be contacted with part of the outer wall of the rotor bearing through the supporting part, the roundness and the surface roughness can meet the matching requirement of the bearing, the motor runs stably, the vibration and the noise during running are reduced, and the service life of the motor can be prolonged and the reliability is improved; in addition, the processing procedure and the production cost are correspondingly reduced, and the production efficiency can be improved.

Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the application include many modifications, variations and equivalents within the spirit and scope of the appended claims.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1 is a schematic view of an electric machine according to an embodiment of the present application;

FIG. 2 is another schematic view of the electric machine of FIG. 1;

FIG. 3 is another schematic view of the electric machine of FIG. 1;

FIG. 4 is a schematic view of a motor end cap according to an embodiment of the present application;

FIG. 5 is another schematic view of a motor end cap according to an embodiment of the present application;

FIG. 6 is an enlarged schematic view of portion B of FIG. 4;

FIG. 7 is another enlarged schematic view of portion B of FIG. 4;

FIG. 8 is another schematic view of a motor end cap according to an embodiment of the present application;

fig. 9 is another schematic view of a motor end cap according to an embodiment of the present application.

Detailed Description

The foregoing and other features of the present application will become apparent from the following description, taken in conjunction with the accompanying drawings. In the description and drawings, particular embodiments of the application are disclosed in detail as being indicative of some of the embodiments in which the principles of the application may be employed, it being understood that the application is not limited to the described embodiments, but, on the contrary, is intended to cover all modifications, variations, and equivalents falling within the scope of the appended claims.

In the embodiments of the present application, the terms "first", "second", and the like are used for distinguishing different elements by reference, but do not denote a spatial arrangement, a temporal order, or the like of the elements, and the elements should not be limited by the terms. The term "and/or" includes any and all combinations of one or more of the associated listed terms. The terms "comprising," "having," and the like, refer to the presence of stated features, elements, components, and do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof.

In the embodiments of the present application, the singular forms "a", "an", and the like may include the plural forms and should be interpreted broadly as "a" or "an" and not limited to the meaning of "a" or "an"; furthermore, the term "comprising" should be understood to include both the singular and the plural, unless the context clearly dictates otherwise. Further, the term "according to" should be understood as "at least partially according to … …" unless the context clearly dictates otherwise.

In the following description of the embodiments of the present application, for the sake of convenience of description, a radial direction around the central axis OO ' of the rotating shaft of the motor is referred to as a "radial direction", a direction around the central axis OO ' is referred to as a "circumferential direction", and a direction along or parallel to the central axis OO ' is referred to as an "axial direction". The side radially distant from the center axis OO 'is referred to as "radially outer" or "outer", and the side radially close to the center axis OO' is referred to as "radially inner" or "inner". It should be noted that these are for convenience of illustration only and do not limit the orientation of the motor during use and manufacture.

Embodiments of the present application will be described below with reference to the drawings.

Embodiments of the first aspect

The embodiment of the application provides a motor end cover, which can be used as a part of a stator structure of a motor, but the application is not limited to this, and for example, the motor end cover can also be used as a part of other products, or the motor end cover can also be used as a stand-alone product. A motor end cover (first end cover) having a bearing chamber in a motor will be described below as an example.

Fig. 1 is a schematic view of a motor according to an embodiment of the present application, showing a portion of the components of the motor 100; fig. 2 is another schematic view of the motor of fig. 1, showing the motor 100 in a side view. As shown in fig. 1 and 2, the motor 100 includes:

the stator structure 101, which includes the first end cap 1011 and the stator, has a housing 1012, the housing 1012 is cylindrical and is configured with the stator core 401 (stator) along the circumferential direction, and the housing 1012 may further include the injection molded part 301 on the stator core 401 (see fig. 3). The first end cover 1011 of the stator structure 101 has a bearing chamber 402 (shown in fig. 4 and 5) in which a rotor bearing can be placed; the first end cover 1011 and the stator core 401 may be integrally formed by injection molding;

a rotor 102 (only partially shown in fig. 1 and 2 because it is shielded) arranged radially inside the stator structure 101; the rotor 102 is rotatable about a central axis OO'; and

a second end cap 103, which together with the stator structure 101 supports the rotor 102.

Fig. 3 is another schematic view of the motor of fig. 1, showing the components of the motor 100 separated. As shown in fig. 3, the first end cover 1011 of the stator structure 101 and the stator may be integrally formed; the housing 1012 of the stator structure 101 is cylindrical and can receive the main body 1021 of the rotor 102. The bearing 1022 of the rotor 102 (which may be referred to as a rotor bearing) may be placed in the bearing chamber 402 (shown in fig. 4 and 5) of the first end cap 1011.

The motor is schematically described above, and the first end cover 1011 formed integrally is schematically described below. The first end cover 1011 may be a front end cover of the motor, or may be a rear end cover of the motor.

Fig. 4 is a schematic view of a motor end cover according to an embodiment of the present application, showing the first end cover 1011 of fig. 3 viewed from the direction O' toward the direction O. Fig. 5 is another schematic view of a motor end cover according to an embodiment of the present application, which is viewed from the cross section along line AA' of fig. 4.

As shown in fig. 4 and 5, the housing 1012 has a cylindrical shape and the stator core 401 is arranged in the circumferential direction. As shown in fig. 5, the stator core 401 may have a plurality of portions exposed on the inner wall; the first end cap 1011 has a bearing chamber 402 in which the rotor bearing 1022 can be placed. The first end cap 1011 and the stator core 401 are integrally molded by injection molding.

As shown in fig. 4, the inner wall of the bearing chamber 402 has a support portion 403 (only one is shown in fig. 4 for simplicity) capable of line-contacting with the outer ring (outer wall) of the rotor bearing 1022 and a connection portion 404 (only one is shown in fig. 4 for simplicity) not contacting with the outer ring of the rotor bearing 1022.

Therefore, the bearing chamber 402 can be contacted (in line contact) with part of the outer wall of the rotor bearing through the supporting part 403, so that not only can the roundness and the surface roughness meet the matching requirement with the bearing, but also the motor runs stably, and the vibration and the noise during running are reduced, thereby prolonging the service life of the motor and improving the reliability; in addition, the processing procedure and the production cost are correspondingly reduced, and the production efficiency can be improved.

In some embodiments, there are multiple supports 403 in the bearing chamber 402 that mate with the outer race of the rotor bearing 1022; a plurality of supporting portions 403 are equally spaced in the circumferential direction of the bearing chamber 402; with the bearing 1022 inserted into the bearing chamber 402, each support portion 503 is in contact with the outer ring of the bearing 1022. Therefore, the rotor bearing can be further stably supported, and the stability of the motor operation is improved.

In some embodiments, the number of the supporting portions 403 is 5 to 21; for example, 13 strips (as shown in fig. 4) may be provided, but the present application is not limited thereto. From this, through many supporting parts of line contact, can further easy to assemble, not only circularity and roughness can satisfy the cooperation requirement with the bearing, and the motor operation is stable moreover.

In some embodiments, the inner wall of the bearing housing 402 has a polygonal cross section taken along the radial direction, and the center portion of each side of the polygonal shape forms the supporting portion 403. For example, fig. 4 shows that the polygon is an equilateral 13-sided polygon, and a support 403 is formed at the center of each side of the 13-sided polygon. Therefore, the processing procedure can be further simplified, the production cost can be reduced, and the production efficiency can be further improved.

In some embodiments, the inner wall of the bearing chamber 402 further has a connecting portion that is not in contact with the outer ring of the bearing 1022, the connecting portion being located between two adjacent support portions; the connecting portion is formed at a certain angle or in an arc shape on a cross section cut along the radial direction of the bearing chamber. Therefore, the requirements of the production process can be reduced, the processing procedures can be reduced, and the production efficiency can be further improved.

Fig. 6 is an enlarged schematic view of a portion B in fig. 4, showing an example of the connection portion 404. As shown in fig. 6, the center of each side of the polygon is a support portion 403; the two sides of the polygon intersect to form an angle, and the corner at which the angle is located is a connecting portion 404. For example, if the polygon is an equilateral 8-sided polygon, the angle is 135 °.

Fig. 7 is another enlarged schematic view of a portion B in fig. 4, showing another example of the connection portion 404. As shown in fig. 7, the center of each side of the polygon is a support portion 403; the intersection of the two sides of the polygon is arc-shaped, and the arc-shaped part is the connecting part 404. In this case, the production process may not be subject to high demands, only that the connection 404 does not contact the rotor bearing.

It should be noted that fig. 6 and 7 are only two examples of the embodiment of the present application, but the present application is not limited thereto, and for example, the polygon may not be an equilateral polygon, but may be an irregular polygon; for example, the intersection of two sides of the polygon may have other shapes, such as a sawtooth shape.

In some embodiments, as shown in fig. 4 and 5, the radially sectioned inner wall of the bearing chamber 402 has an equilateral 13-sided polygon. As shown in fig. 4, a support portion 403 is formed at the center portion of each side of the equilateral polygon, and a connection portion 404 is formed at each corner portion of the equilateral polygon. Therefore, the matching between the motor operation and the bearing chamber can be optimized, and the stability of the motor operation is further improved.

For example, a test may be performed based on actual motor operation, and the number and the side length of the polygon of the plastic bearing chamber may be optimized many times to match the number of balls of the ball bearing and the inner and outer diameters of the bearing, thereby determining which polygon is preferable. Fig. 4 and 5 of the embodiment of the present application illustrate an equilateral 13-sided polygon as an example, but the present application is not limited thereto, and for example, an equilateral triangle, a 4-sided polygon, a 5-sided polygon, an 8-sided polygon, and the like may be used.

In some embodiments, the inner wall of the bearing chamber 402 has a circular cross section along the radial direction, and the support part 403 is a convex structure protruding from the circular cross section to the radial inner side. Therefore, the processing procedure can be further simplified, the production cost can be reduced, and the production efficiency can be further improved.

Fig. 8 is another schematic view of a motor end cover according to an embodiment of the present application, and as shown in fig. 8, an inner wall of the bearing chamber 402 is substantially circular in cross section along a radial direction, and the inner wall of the bearing chamber 402 has a support portion 801 capable of contacting with a part of an outer wall of the rotor bearing 1022.

As shown in fig. 8, the support portion 801 has a convex structure protruding radially inward from the inner wall of the bearing chamber 402. Fig. 8 illustrates an example of 4 support portions 801; however, the present application is not limited thereto, and may also be, for example, 3, 5, 8, 13, etc. protruding structures distributed at equal intervals.

Fig. 9 is another schematic view of the motor end cover according to the embodiment of the present application, and as shown in fig. 9, the inner wall of the bearing chamber 402 is substantially circular in cross section along the radial direction, and the inner wall of the bearing chamber 402 has a connection portion 901 that does not contact with a part of the outer ring of the rotor bearing 1022.

As shown in fig. 9, the connecting portion 901 has a recessed portion structure recessed radially outward from the inner wall of the bearing chamber 402. Fig. 9 illustrates an example of 4 connection portions 901; however, the present application is not limited to this, and may also be, for example, 3, 5, 8, 13, and the like, which are distributed at equal intervals.

In addition, fig. 4 schematically illustrates the support portion and the connection portion in the embodiment of the present application by taking a polygonal shape as an example, fig. 8 schematically illustrates a convex structure as an example, and fig. 9 schematically illustrates a concave structure as an example.

In the above example, the first end cover 1011 and the stator core 401 are integrally molded by injection molding, but the present invention is not limited thereto, and for example, the motor end cover and the stator core may be separate components. The motor end cover of the embodiment of the present application may be a plastic component integrally formed by injection Molding, that is, the material of the motor end cover is plastic, such as Bulk Molding Compound (BMC), but the present application is not limited thereto.

It should be noted that fig. 1 to 9 only schematically illustrate the motor and the motor end cover of the embodiment of the present application, but the present application is not limited thereto; for example, other components or devices may be provided, and specific reference may be made to the related art, and the description thereof will be omitted. Reference may be made to the related art for elements or components not specifically identified in fig. 1 through 9, which are not intended to be limited by the present application.

In addition, the above is only an exemplary explanation of each device or component, but the present application is not limited thereto, and the specific contents of each device or component may also refer to the related art; it is also possible to add devices or components not shown in fig. 1 to 9 or to reduce one or more devices or components in fig. 1 to 9.

According to the embodiment, the bearing chamber of the embodiment of the application can be contacted with part of the outer wall of the bearing through the supporting part, so that the roundness and the surface roughness can meet the matching requirement of the bearing, the motor runs stably, the vibration and the noise are reduced during running, the service life of the motor can be prolonged, and the reliability is improved; in addition, the processing procedure and the production cost are correspondingly reduced, and the production efficiency can be improved.

Embodiments of the second aspect

An embodiment of the present application further provides a stator structure of a motor, including the motor end cover according to the embodiment of the first aspect. Since in the embodiment of the first aspect, the motor and the motor end cover and the like have been described in detail, the contents thereof are incorporated herein, and the description thereof is omitted here.

In an embodiment of the application, the stator structure comprises a first end cover and a stator, wherein the first end cover is provided with a bearing chamber capable of placing a rotor bearing; the first end cover and the stator core are integrally formed through injection molding; the inner wall of the bearing chamber of the first end cover has a support portion in line contact with the outer ring of the rotor bearing and a connection portion not in contact with the outer ring of the rotor bearing.

Therefore, the bearing chamber can be contacted with part of the outer wall of the rotor bearing through the supporting part, the roundness and the surface roughness can meet the matching requirement of the bearing, the motor runs stably, the vibration and the noise during running are reduced, and the service life of the motor can be prolonged and the reliability is improved; in addition, the processing procedure and the production cost are correspondingly reduced, and the production efficiency can be improved.

In some embodiments, the inner wall of the bearing chamber has a plurality of supports capable of line-contacting a portion of the outer wall of the rotor bearing. From this, through a plurality of supporting parts of line contact, can further easy to assemble, not only circularity and roughness can satisfy the cooperation requirement with the bearing, and the motor operation is stable moreover.

In some embodiments, a cross-section of the inner wall of the bearing chamber taken along the radial direction has a polygonal shape, and a central portion of each side of the polygonal shape forms the supporting portion. Therefore, the processing procedure can be further simplified, the production cost can be reduced, and the production efficiency can be further improved.

In some embodiments, the first end cover may be a front end cover of the motor, the front end cover and the stator core are integrally molded by injection molding to form the stator structure of the embodiment, and the second end cover may be a rear end cover of the motor.

In some embodiments, the first end cover may be a rear end cover of the motor, the rear end cover and the stator core are integrally molded by injection molding to form the stator structure of the embodiment, and the second end cover may be a front end cover of the motor.

Examples of the third aspect

Embodiments of the present application further provide an electric machine, including an electric machine end cover as described in embodiments of the first aspect or a stator structure as described in embodiments of the second aspect. Since in the embodiment of the first aspect, detailed description has been given of the motor end cover, the bearing chamber, and the like, the contents of which are incorporated herein, the description is omitted here.

The motor of the embodiment of the application includes:

a stator structure comprising a first end cap and a stator, the first end cap having a bearing chamber in which a rotor bearing can be placed; the first end cover and the stator core are integrally formed through injection molding;

a rotor arranged radially inside the stator; and

a second end cover supporting the rotor in cooperation with the stator structure;

wherein an inner wall of the bearing chamber of the first end cover has a support portion in line contact with an outer ring of the rotor bearing and a connection portion not in contact with the outer ring of the rotor bearing.

In the embodiment of the present application, the motor may be included in various electromechanical devices, such as a refrigeration device, a home appliance device, an office automation device, an industrial device, and the like; the embodiments of the present application are not limited thereto.

The present application has been described in conjunction with specific embodiments, but it should be understood by those skilled in the art that these descriptions are intended to be illustrative, and not limiting. Various modifications and adaptations of the present application may occur to those skilled in the art based on the spirit and principles of the application and are within the scope of the application.

Preferred embodiments of the present application are described above with reference to the accompanying drawings. The many features and advantages of the embodiments are apparent from the detailed specification, and thus, it is intended by the appended claims to cover all such features and advantages of the embodiments that fall within the true spirit and scope thereof. Further, since numerous modifications and variations will readily occur to those skilled in the art, it is not desired to limit the embodiments of the present application to the exact construction and operation illustrated and described, and accordingly, all suitable modifications, variations and equivalents may be resorted to, falling within the scope thereof.

Claims (10)

1. A motor end cover is provided with a bearing chamber capable of placing a bearing; the inner wall of the bearing chamber is provided with a supporting part in line contact with an outer ring of the bearing.

2. The motor end cover according to claim 1, wherein there are a plurality of support portions in the bearing chamber that engage with the outer race of the bearing; the supporting parts are distributed at equal intervals along the circumferential direction of the bearing chamber;

each of the support portions is in line contact with an outer ring of the bearing with the bearing inserted into the bearing chamber.

3. The motor end cover of claim 2, wherein the number of support portions is 5 to 21.

4. The motor end cover according to claim 2, wherein a cross section of the inner wall of the bearing chamber taken along the radial direction is a polygon, and a central portion of each side of the polygon forms the support portion.

5. The motor end cap of claim 4 wherein said polygon is an equilateral 13-sided polygon.

6. The motor end cover according to claim 1, wherein the inner wall of the bearing chamber further has a connecting portion that is not in contact with the outer ring of the bearing, the connecting portion being located between adjacent two of the supporting portions;

the connecting portion is formed at a certain angle or in an arc shape on a cross section cut along the radial direction of the bearing chamber.

7. The motor end cover according to claim 6, wherein the support portion is a convex structure that protrudes radially inward from an inner wall of the bearing chamber, and/or the connection portion is a concave structure that is recessed radially outward from the inner wall of the bearing chamber.

8. The motor end cover of claim 1, wherein the motor end cover is a plastic component that is integrally molded by injection molding.

9. A stator structure comprises a first end cover and a stator, wherein the first end cover is provided with a bearing chamber capable of placing a rotor bearing; the first end cover and the stator core are integrally formed through injection molding;

the inner wall of the bearing chamber of the first end cover has a support portion in line contact with the outer ring of the rotor bearing and a connection portion not in line contact with the outer ring of the rotor bearing.

10. An electric machine comprising:

a stator structure comprising a first end cap and a stator, the first end cap having a bearing chamber in which a rotor bearing can be placed; the first end cover and the stator core are integrally formed through injection molding;

a rotor arranged radially inside the stator; and

a second end cover supporting the rotor in cooperation with the stator structure;

the inner wall of the bearing chamber of the first end cover has a support portion in line contact with the outer ring of the rotor bearing and a connection portion not in line contact with the outer ring of the rotor bearing.

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