MOTOR

Abstract

Motor, the motor comprising: a rotor; a stator arranged radially opposite the rotor and on a radially outer side of the rotor; and a housing accommodating at least a part of the rotor and at least a part of the stator, the stator comprising an iron core and a resin section covering the iron core; the resin section comprising an abutting section abutting an underside of the housing on an axial side; the abutting section being connected in an annular form around the entire circumference of a central axis and being located closer to a radially inner side than to a radially central position of the stator; a gap being present in the axial direction between an axial side of the stator and the housing, the gap forming a first space; and the abutting section being arranged on a radially inner side of the first space.According to the embodiments of the present application, the ingress of dirt into the rotor can be prevented, thereby ensuring the performance of the motor.

Description

FIELD OF THE INVENTION

[0001] The present invention relates to the field of electromechanical technology, in particular to a motor. STATE OF THE ART

[0002] A motor typically includes a stator, a rotor, and a housing that houses the stator and rotor. During the assembly process, the stator and / or rotor are pressed into the housing to complete the assembly.

[0003] In an inner rotor motor, when a stator iron core is press-fitted into the housing, dirt generated during the pressing process penetrates into the rotor part and disperses as the rotor rotates, affecting the performance of the motor.

[0004] It should be noted that the above introduction to the technical background serves only to provide a clear and complete description of the technical solutions of the present application and to facilitate understanding by those skilled in the art. It cannot be assumed that the above technical solutions are known to those skilled in the art simply because these solutions are described in the prior art section of the present application. SUMMARY

[0005] To solve at least one of the above problems and other similar problems, embodiments of the present application provide a motor that can prevent dirt from entering a rotor and ensure the performance of the motor.

[0006] According to one embodiment of the present application, an engine is provided. The engine comprises: a rotor; a stator arranged radially opposite the rotor and on a radially outer side of the rotor; and a housing which accommodates at least part of the rotor and at least part of the stator, wherein the stator has an iron core and a resin portion covering the iron core; the resin portion includes an abutting portion that abuts against a bottom of the housing on an axial side in the housing; the abutting portion is connected in a ring shape around the entire circumference of a central axis; the adjacent portion is located closer to a radially inner side than to a radially central position of the stator; there is a gap between an axial side of the stator and the housing in the axial direction, and the gap forms a first space; and the adjacent portion is arranged on a radially inner side of the first space.

[0007] In one or more embodiments, the first space extends toward a radially outer side from the abutting portion to an edge of the housing.

[0008] In one or more embodiments, a second space is formed between the stator and the housing in a radial direction, the second space is arranged on an axial side of a rear yoke of the iron core, and the second space is connected to the first space.

[0009] In one or more embodiments, the abutting portion abuts against a bottom of the housing by a sealing ring disposed on an axial side of the resin portion.

[0010] In one or more embodiments, the resin portion includes an insulating member and a molded resin molded on an axial side of the insulating member, and the abutting portion is integrally formed on the molded resin.

[0011] In one or more embodiments the molded resin further has a third space in one axial side which is recessed toward the other axial side, and the third space is connected to the first space.

[0012] In one or more embodiments, the insulating member includes a yoke portion disposed on a radially outer side, and the third space is disposed on a radially inner side of the yoke portion of the insulating member.

[0013] In one or more embodiments, the third space is arranged on an axial side of the insulating element.

[0014] In one or more embodiments, a radially outer edge of the bottom of the housing is provided with a hole extending through the housing.

[0015] In one or more embodiments, the abutting portion is located closer to a radially inner side than an outer diameter of the rotor.

[0016] One of the beneficial effects of the embodiments of the present application is that the resin portion of the stator includes the abutting portion that abuts the bottom of the housing, the abutting portion being connected in a ring shape around the entire circumference of the central axis, and the abutting portion being located on the radially inner side of the first space formed by the stator and the housing in the axial direction. Consequently, the dirt generated during the stator molding process can be contained in the first space and shielded by the abutting portion on the outer side of the rotor, thereby preventing dirt from entering the rotor and ensuring motor performance.

[0017] With reference to the following description and the accompanying drawings, specific implementations of the present application are disclosed in detail to indicate one way in which the principles of the present application may be practiced. It should be understood that the implementations of the present application are not limited in scope thereby. Implementations of the present application encompass many changes and modifications within the scope of the spirit and conditions of the appended claims.

[0018] Features described and / or illustrated with respect to one implementation may be applied in the same or a similar manner in one or more other implementations, in combination with, or in place of features in other implementations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Elements and features described in an accompanying drawing or an implementation of embodiments of the present application may be combined with elements and features shown in one or more accompanying drawings or implementations. Furthermore, in the accompanying drawings, like reference numerals indicate corresponding components and may be used to indicate corresponding components used in more than one implementation.

[0020] The accompanying drawings are used to provide a broader understanding of the embodiments of the present application, which form a part of the description to illustrate the implementation of the present application, and together with the text description, to explain the principle of the present application. Obviously, the accompanying drawings in the following description are only some embodiments of the present disclosure, and according to these drawings, those skilled in the art can also obtain other accompanying drawings. In the accompanying drawings: Fig. 1 is a schematic representation of an engine according to an embodiment of the present application; and Fig. 2 shows a further schematic representation of an engine according to an embodiment of the present application. DETAILED DESCRIPTION

[0021] The above and other features of the present application will become apparent from the following description with reference to the accompanying drawings. Specific implementations of the present application are disclosed in the description and the accompanying drawings, indicating some implementations in which the principles of the present application may be applied. It should be understood that the present application is not limited to the described implementations. On the contrary, the present application includes all modifications and variations that fall within the scope of the appended claims.

[0022] In the embodiments of the present application, the term "and / or" includes any and all combinations of one or more of the associated listed terms. The terms "comprising," "including," "having," and the like refer to the presence of specified features, elements, components, or assemblies, but do not preclude the presence or addition of one or more other features, elements, components, or assemblies.

[0023] In embodiments of the present application, the singular forms "a," "a type," "a thing," and the like may include plural forms, which is broadly understood as "a kind" or "a class," but is not limited to the meaning of "a." Furthermore, the phrase "the," "the," or "that" should be understood to include both the singular and plural forms unless the context clearly indicates otherwise. Furthermore, the phrase "according to" should be understood as "at least in part according to..."; and the phrase "based on" should be understood as "at least in part based on..." unless the context clearly indicates otherwise.

[0024] In the embodiments of the present application, for the convenience of explanation, a central axis OO' of a motor or a direction parallel to this central axis OO' is referred to as an "axial direction", a radius direction with an axis as a center is referred to as a "radial direction", and a direction around the axis is referred to as a "circumferential direction", but these are only for the convenience of explanation and do not limit an orientation of the motor during use and manufacture.

[0025] Various implementations of the embodiments of the present application are described below with reference to the accompanying drawings. These implementations are only exemplary and are not intended to limit the embodiments of the present application.

[0026] An embodiment of the present application provides an engine.

[0027] Fig. 1 is a schematic representation of an engine 10 according to an embodiment of the present application, showing a schematic axial cross-sectional view of the engine 10 cut and perceived along a central axis OO'.

[0028] As in Fig. As shown in Figure 1, the motor 10 includes a stator 11, a rotor 12, and a housing 13. The stator 11 is located radially opposite the rotor 12 and is disposed on a radially outer side of the rotor 12. The housing 13 accommodates at least a portion of the rotor 12 and at least a portion of the stator 11. Thus, in embodiments of the present application, the motor 10 may be an inner rotor motor.

[0029] As in Fig. 1, the stator 11 includes an iron core 111 and a resin portion 112 covering the iron core 111.

[0030] As in Fig. 1, the resin portion 112 includes an abutting portion 1121 that abuts against a bottom surface 131 of the housing 13 on an axial side in the housing 13.

[0031] In the embodiments of the present application, the abutting portion 1121 is connected in a ring shape around the entire circumference of the central axis OO'. The abutting portion 1121 is located closer to a radially inner side than to a radially central position of the stator 11. The radially central position of the stator 11 refers to a radially central position of the stator part on one side (the left or right side of the central axis OO' in Fig. 1) the central axis OO' in an axial cross-section, shown in Fig. 1.

[0032] As in Fig. As shown in Figure 1, a gap is provided between an axial side (O' side) of the stator 11 and the housing 13 in the axial direction. The gap forms a first space S1, and the abutting portion 1121 is located on a radially inner side of the first space S1.

[0033] As seen from the above embodiment, the resin portion 112 of the stator 11 includes an abutting portion 1121 abutting against a bottom surface 131 of the housing 13 on an axial side in the housing 13. The abutting portion 1121 is connected in a ring shape around the entire circumference of the central axis OO', and the abutting portion 1121 is located on the radially inner side of the first space S1 formed by the stator 11 and the housing 13 in the axial direction. Consequently, dirt generated during the pressing process of the stator 11 can be accommodated in the first space S1 and shielded by the abutting portion 1121 on the outer side of the rotor 12, thereby preventing the intrusion of dirt into the rotor 12 and ensuring the performance of the motor.

[0034] In addition, the abutting portion 1121 is closer to the radially inner side than to the radially central position of the stator 11, thereby ensuring that the first space S1 has a sufficient size in the radial direction and further ensuring a space for receiving the dirt.

[0035] As in Fig. 1, in one or more embodiments, the first space S1 extends toward a radially outer side from the abutting portion 1121 to the edge of the housing 13, wherein the first space S1 has sufficient space to accommodate the dirt. However, the present invention is not limited thereto. For example, it is possible for the first space S1 not to extend to the edge of the housing 13.

[0036] As in Fig. 1, in one or more embodiments, a second space S2 is formed between the stator 11 and the housing 13 in a radial direction, the second space S2 is arranged on an axial side (O' side) of a rear yoke 1111 of the iron core 111, and the second space S2 is connected to the first space S1.

[0037] In the embodiments of the present application, the stator iron core may include a plurality of radially extending tooth portions and a cylindrical rear yoke disposed on a radially outer side of the tooth portions. In other words, the rear yoke is an outer peripheral portion of the iron core. Furthermore, the structure of the stator iron core may also refer to related technologies.

[0038] Consequently, the dirt generated during the pressing process of the iron core can fall into the first space S1 through the second space S2, and a receiving space is extended through the first space S1.

[0039] As in Fig. As shown in Figure 1, in one or more embodiments, the resin portion 112 includes an insulating member 1122 and a molded resin 1123 molded on an axial side (O' side) of the insulating member 1122, and the abutting portion 1121 is integrally formed on the molded resin 1123. As a result, the abutting portion can be directly formed by the molded resin without the need for additional processing, which can simplify the molding process.

[0040] In this embodiment of the present application, the insulating member 1122 is provided for insulation between the stator iron core and a coil. The resin portion 112 includes the insulating member 1122. Furthermore, the resin portion further includes a molded resin 1123 on an axial side (O' side) of the insulating member 1122, and the abutting portion 1121 is provided on the molded resin 1123.

[0041] In one or more embodiments, the molded resin 1123 and the abutting portion 1121 may be integrally formed, thereby simplifying the formation. That is, after the iron core is manufactured, the iron core is positioned in a mold, and the molded resin and the abutting portion are integrally formed in a molding manner.

[0042] However, the present invention is not limited thereto. For example, each of the insulating member 1122, the molded resin 1123, and the abutting portion 1121 may be formed independently and then assembled, which is not limited by the present application.

[0043] As in Fig. 1, in one or more embodiments, the molded resin 1123 also has a third space S3 on one axial side (O' side) that is recessed toward the other axial side (O side), and the third space S3 is connected to the first space S1.

[0044] Consequently, the third space S3 can further increase the size of a space for receiving the dirt.

[0045] For example, in a case where the bottom surface 131 of the housing 13 is provided with a fastening component that passes through the bottom surface to install the motor 10, the fastening component may be a screw, etc. Debris generated during installation of the fastening component may be accommodated in the third space S3. Furthermore, in a case where the fastening component passes through the bottom surface 131 and protrudes from the inside of the bottom surface 131 of the housing, the protruding part may be accommodated in the third space S3 to prevent the fastening component from interfering with other components in the motor.

[0046] In this embodiment of the present application, the first space S1, the second space S2, and the third space S3 may each have a shape extending in a circumferential direction and covering the entire circumference, but the present application is not limited to this. For example, there may be a plurality of second spaces S2 arranged at intervals in a circumferential direction, and there may also be a plurality of third spaces S3 arranged at intervals in a circumferential direction, which is not limited in the present application. The specific implementations can be determined according to actual needs.

[0047] As in Fig. 1, in one or more embodiments, the insulating member 1122 includes a yoke portion 1124 disposed on a radially outer side, and the third space S3 is disposed on a radially inner side of the yoke portion 1124 of the insulating member 1122. Consequently, the third space S3 can be prevented from interfering with the yoke portion of the insulating member.

[0048] However, the present application is not limited thereto. The third space S3 may also partially overlap with the yoke portion 1124 in an axial direction.

[0049] In one or more embodiments, the third space S3 is located on an axial side of the insulating member, which can prevent the third space from interfering with the insulating member and a coil of the stator iron core. That is, the molded resin 1123 has a sufficient size in the axial direction to form the third space S3, so that the third space S3 can be arranged on an axial side of the insulating member, thereby preventing interference.

[0050] However, the present application is not limited to this. For example, the third space and the insulating element may also have overlapping portions when viewed from a radial direction.

[0051] In one or more embodiments, a radially outer edge of the bottom surface 131 of the housing 13 is provided with a hole portion extending through the housing 13. Consequently, it facilitates the discharge of dirt generated during the stator pressing process.

[0052] In the embodiment of the present application, there is no limitation on the specific shape of the hole portion. For example, the hole portion may have a shape in which a hole diameter of a portion facing the inside of the housing is larger than a hole diameter of a portion facing the outside of the housing, thereby preventing external contaminants from entering the housing while facilitating the discharge of dirt. However, the present application is not limited to this, and the hole portion may also have other shapes.

[0053] In the embodiments of the present application, the number of hole sections is not limited. The number of hole sections may be plural. The plurality of hole sections may be arranged at equal or unequal intervals along a circumferential direction, which is not limited in the present application.

[0054] As in Fig. 1, in one or more embodiments, the abutting portion 1121 is located closer to a radially inner side than the outer diameter of the rotor 12. Consequently, a labyrinth structure may be formed between the resin portion 112, the housing 13, and the rotor 12, which may further prevent dirt from entering the rotor.

[0055] However, the present application is not limited thereto. For example, the abutting portion 1121 may also be radially aligned with the outer diameter of the rotor 12 or may be located closer to the radially outer side than the outer diameter of the rotor 12.

[0056] In the embodiments of the present application, as in Fig. As shown in Figure 1, the abutting portion 1121 may directly abut the bottom 131 of the housing 13, but the application is not limited thereto. The abutting portion may also indirectly abut the bottom of the housing.

[0057] Fig. 2 is another schematic diagram of a motor according to an embodiment of the present application, showing a case where the abutting portion indirectly abuts against the bottom of the housing.

[0058] As in Fig. 2, in one or more embodiments, an abutting portion 1121' abuts the bottom surface 131 of the housing 13 through a sealing ring 14 disposed on an axial side (O' side) of the resin portion 112.

[0059] Consequently, the sealing ring makes the abutment more reliable for the purpose of contact. On the other hand, the elasticity of the sealing ring prevents harsh interference with the bottom of the housing when the stator is press-fitted, thus improving the degree of design freedom.

[0060] In one or more embodiments, a groove may be formed in one end on an axial side (O' side) of the resin portion 112 to receive at least a part of the seal ring 14, thereby preventing breakage of the seal ring 14 and ensuring a sealing effect.

[0061] It should be noted that the above Fig. 1 to 2 only schematically illustrate the engine in the embodiments of the present application, but the present application is not limited thereto. The specific content of various structures or components may also relate to related technologies. In addition, structures or components shown in the Fig. 1 to 2 are not shown, may also be enlarged; or one or more structures or components in the Fig. 1 to 2 can be reduced in size. Components or elements that are in the Fig. 1 to 2 are not specifically specified, such as the motor, which may also include a bearing or the like, may relate to related technologies, and the present application does not limit them.

[0062] As seen from the above embodiments, the resin portion of the stator includes an abutting portion that abuts the bottom surface of the housing, the abutting portion being connected in a ring shape around the entire circumference of the central axis, and the abutting portion being located on the radially inner side of the first space formed by the stator and the housing in the axial direction. Consequently, the dirt generated during the stator molding process can be contained in the first space and shielded by the abutting portion on the outer side of the rotor, thereby preventing dirt from entering the rotor and ensuring the performance of the motor.

[0063] The embodiments of the present application are described above in connection with specific implementations, but those skilled in the art should understand that these descriptions are exemplary and are not intended to limit the scope of the embodiments of the present application. Those skilled in the art may make various variations and modifications to the present application in accordance with the spirit and principles of the embodiments of the present application, and these variations and modifications are also within the scope of the embodiments of the present application.

[0064] The preferred implementations of the embodiments of the present application have been described above with reference to the accompanying drawings. Many features and advantages of these implementations are apparent from the detailed description. Accordingly, the appended claims are intended to cover all such features and advantages that fall within the true spirit and scope of these implementations. Furthermore, since many modifications and changes are readily apparent to those skilled in the art, it is not intended to limit the implementations of the embodiments of the present invention to the precise acts and structure shown and described, but are intended to cover all suitable modifications falling within their scope.

Claims

[1] Engine, comprising: a rotor; a stator arranged radially opposite the rotor and on a radially outer side of the rotor; and a housing which accommodates at least part of the rotor and at least part of the stator, wherein the stator has an iron core and a resin portion covering the iron core, the resin portion has an abutting portion which abuts on an axial side in the housing against a bottom of the housing, the adjacent portion is connected in a ring shape around the entire circumference of a central axis and is located closer to a radially inner side than to a radially central position of the stator, there is a gap between an axial side of the stator and the housing in the axial direction, and the gap forms a first space, and the adjacent portion is arranged on a radially inner side of the first space. [2] The motor according to claim 1, wherein the first space extends toward a radially outer side from the abutting portion to an edge of the housing. [3] Engine according to claim 1 or 2, wherein: a second space is formed between the stator and the housing in a radial direction, the second space is arranged on an axial side of a rear yoke of the iron core, and the second room is connected to the first room. [4] A motor according to any one of claims 1 to 3, wherein the abutting portion abuts against the underside of the housing through a sealing ring disposed on an axial side of the resin portion. [5] Engine according to one of claims 1 to 4, wherein the resin portion comprises an insulating member and a molded resin molded on an axial side of the insulating member, and the adjacent portion is integrally formed on the molded resin. [6] Engine according to claim 5, wherein the molded resin further has a third space on one axial side which is recessed toward the other axial side, and the third room is connected to the first room. [7] Engine according to claim 6, wherein the insulating member comprises a yoke portion disposed on a radially outer side, and the third space is arranged on a radially inner side of the yoke portion of the insulating member. [8] A motor according to claim 6 or 7, wherein the third space is arranged on an axial side of the insulating member. [9] A motor according to any one of claims 1 to 8, wherein a radially outer edge of the bottom of the housing is provided with a hole portion passing through the housing. [10] A motor according to any one of claims 1 to 9, wherein the abutting portion is closer to a radially inner side than an outer diameter of the rotor.

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