Motor

Abstract

Embodiments of the present application provide a motor. The motor includes a housing, the housing comprising: an outer circumferential wall extending circumferentially around a central axis, an opening section on one axial side of the outer circumferential wall, and a bottom surface on the other axial side of the outer circumferential wall; and a stator assembly formed by molds, the stator assembly comprising a stator, a busbar assembly, and a molded resin; the busbar assembly is supported on the stator; the molded resin covers the busbar assembly in an axial direction; the busbar assembly comprises a metal busbar; the molded resin is located on an axial side of the stator and has projections that extend in the direction of an axial side; in a cross-section perpendicular to the axial direction, a projection of the busbar overlaps a shoulder of the projection at least partially;and the molded resin is poured between the busbar and the projection. Consequently, the projections are axially supported by the busbar, which increases the strength of the projections and facilitates the assembly of the molded stator assembly in the housing.

Description

FIELD OF THE INVENTIONThe present invention relates to the field of electromechanical technology, in particular to a motor.PRIOR ARTDuring the process of assembling a motor, it is usually necessary to assemble a shaped stator iron core and a housing. The existing general method is to allow a tool to abut on a molded resin surface so that the stator iron core is pressed into the housing from an opening side of the housing.Note that the above introduction to the technical background is only for the purpose of clearly and fully describing the technical solutions of the present application and for the purpose of understanding by those skilled in the art. It cannot be assumed that the above technical solutions are known to those skilled in the art only because these solutions are described in the prior art section of the present application.SUMMARYThe inventors have found that in the process of assembling the motor by the above method, a molded resin surface is cracked due to insufficient strength of the resin when a mounting tool abuts against the molded resin surface and applies a pressure.In order to solve at least one of the above problems or similar problems, embodiments of the present application provide an engine. A metal bus bar is provided in the motor such that a protrusion is axially supported by the bus bar, which increases the strength of the protrusion and facilitates assembly of a molded stator assembly in a housing.According to a first aspect of embodiments of the present application, an engine is provided. The engine includes:a housing, the housing having an outer circumferential wall extending circumferentially about a central axis, an opening portion on one axial side of the outer circumferential wall, and a bottom surface on the other axial side of the outer circumferential wall; anda stator assembly formed by molding, the stator assembly includinga stator,a bus bar assembly; anda molded resin,wherein the bus bar assembly is supported on the stator,the molded resin covers the bus bar assembly in an axial direction,the bus bar assembly includes a metal bus bar,the molded resin is located on an axial side of the stator and has protrusions protruding toward an axial side,in a cross section perpendicular to the axial direction, a protrusion of the busbar at least partially overlaps a shoulder of the protrusion, andthe molded resin is filled between the bus bar and the protrusion.In at least one embodiment, the bus bar includes claw portions that clamp a coil lead of the stator, and at least partially overlaps a boss of the claw portion in a cross section perpendicular to the axial direction of the boss.In at least one embodiment, the claw portion extends into the protrusion in an axial direction.In at least one embodiment, the number of the claw portions is two or more, and the claw portions are equally spaced in a circumferential direction.In at least one embodiment, the number of the claw portions is three.In at least one embodiment, at least two groups of coil leads are configured in the circumferential direction, each group includes at least two of the coil leads, and the coil leads in the same group are led out from the same tooth pitch and clamped by the same claw portion.In at least one embodiment, the claw portion includes a first arm portion and a second arm portion that extend in opposite directions in the circumferential direction, respectively, and the first arm portion and the second arm portion clamp different coil leads in the same group.In at least one embodiment, the protrusion extendsfrom a radially outer side to a radially inner side, andbeinhalteta main body portion; anda first additional reinforcing portion disposed on a radial side of the main body portion; anda width of the main body portion in the circumferential direction is larger than that of the first additional reinforcing portion.In at least one embodiment, the main body portion is disposed on the radially outer side relative to the first additional reinforcing portion.In at least one embodiment, the molded resin also has an additional protrusion on an axial side, the additional protrusion extends from the radially outer side to the radially inner side, and is disposed between the adjacent protrusions in the circumferential direction, and the additional protrusion has a circumferential width smaller than that of the main body portion.One of the beneficial effects of the embodiments of the present application is that: the protrusions are axially supported by the bus bar, which increases the strength of the protrusions and facilitates assembly of the molded stator assembly in the housing.With reference to the following description and the accompanying drawings, specific implementations of the present application are disclosed in detail so as to indicate a manner in which the principles of the present application may be practiced. It is understood that the implementations of the present application are not limited in scope thereby. Implementations of the present application include many changes and modifications within the scope of the spirit and conditions of the appended claims.Features described and / or illustrated with respect to one implementation may be applied in the same or similar manner in one or more other implementations, in combination with, or in place of, features in other implementations.It should be appreciated that the term "include / comprise," when referring herein to the presence of a feature, integer, step, or assembly, does not preclude the presence or addition of one / r / s or more other features, integers, steps, or assemblies.BRIEF DESCRIPTION OF THE DRAWINGSElements and features described in an accompanying drawing or implementation of embodiments of the present application may be combined with elements and features shown in one or more accompanying drawings or implementations. Further, in the accompanying drawings, like numerals designate corresponding components and may be used to designate corresponding components that are used in more than one implementation.The accompanying drawings included are used to provide a broader understanding of the embodiments of the present application, which form a part of the specification for illustrating the practice of the present application, and together with the text description 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 without paying for curative work. In the accompanying drawings: FIG. 1 is a schematic view of a split motor 100 according to an embodiment of the present application; FIG. 2 is a schematic view of the assembled motor 100 according to the embodiment of the present application; FIG. 3 is a sectional view of a portion of the motor 100 according to the embodiment of the present application, cut along a central axis OO'; FIG. 4 is a schematic diagram of a coil lead 4 in the motor 100 shown in FIG. 1 clamped by a claw portion 2211; FIG. 5 is a schematic diagram of the coil lead 4 in the motor 100 shown in FIG. 1 not clamped by the claw portion 2211; and FIG. 6 is a schematic plan view of a stator assembly 2 in the motor 100 shown in FIG. 1 along an axial direction OO'.DETAILED DESCRIPTIONThe above and other features of the present application will become apparent from the following description with reference to the accompanying drawings. In the specification and the accompanying drawings, specific implementations of the present application are disclosed, which provide some implementations in which the principles of the present application may be applied. It is understood that the present application is not limited to the described implementations. On the contrary, the present application includes all modifications, variations and equivalents falling within the scope of the appended claims. Hereinafter, various implementations of the present application will be described with reference to the accompanying drawings. These implementations are only exemplary, but are not intended to limit the present application.In the embodiments of the present application, the terms "first / r / s", "second / r / s", "upper / r / s", "lower / r / s", etc. are used to distinguish various like-named elements, but do not indicate a spatial arrangement or chronological order of these elements, etc., and these elements should not be limited by these terms. 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 stated features, elements, components, or assemblies, but do not preclude the presence or addition of one or more other features, elements, components, or assemblies.In the embodiments of the present application, the singular forms "a / r / s", "these / r / s", and the like may include plural forms, which are broadly understood as "a kind" or "a class", but are not limited to the meaning of "a / r / s". Moreover, the term "the" is to be understood to include both the singular form and the plural form, unless the context clearly dictates otherwise. Further, the term "according" should be understood as "at least partially according to... " and the term "based on" should be understood as "at least partially based on... " unless the context clearly indicates otherwise.Moreover, in the following description of embodiments of the present application, for convenience of description, a direction extending along a central axis of a motor or a direction parallel to this direction is referred to as an "axial direction"; a radius direction centered on the central axis is referred to as a "radial direction"; a side along the radius direction away from the central axis is referred to as a "radially outer side"; a side along the radius direction near the central axis is referred to as a "radially inner side"; and a direction around this central axis is referred to as a "circumferential direction". It should be noted, however, that these terms are for convenience of illustration only and do not limit the orientation of the motor during use and manufacture.The embodiments of the present application will be described below with reference to the accompanying drawings.An embodiment of the present application provides an engine.FIG. 1 is a schematic view of a split motor 100 according to an embodiment of the present application; FIG. 2 is a schematic view of the assembled motor 100 according to the embodiment of the present application; and FIG. 3 is a sectional view of a portion of the motor 100 according to the embodiment of the present application, cut along a central axis OO'.As shown in FIGS. 1, 2, and 3, the motor 100 includes a housing 1 and a stator assembly 2.The housing 1 has an outer peripheral wall 11 extending circumferentially about the central axis OO', an opening portion 111 on one axial side of the outer peripheral wall 11, and a bottom surface 112 on the other axial side of the outer peripheral wall 11.The stator assembly 2 is formed by molding. The stator assembly 2 includes a stator 21, a bus bar assembly 22, and a molded resin 23. the bus bar assembly 22 is supported on the stator 21; and the molded resin 23 covers the bus bar assembly 22 in an axial direction.The bus bar assembly 22 includes a metal bus bar 221 and a bus bar holder 222, and the bus bar holder 222 is used to hold the bus bar 221.The molded resin 23 is located on an axial side of the stator 21, and has a protrusion 231 protruding toward an axial side. In a cross section perpendicular to the axial direction, a protrusion of the bus bar 221 at least partially overlaps a shoulder of the protrusion 231; and the molded resin 23 is filled between the bus bar 221 and the protrusion 231.According to the motor 100 in this embodiment of the present application, the protrusion 231 is provided on the surface of the molded resin 23, and the metal bus bar 221 is embedded in the protrusion 231. Since the protrusion of the bus bar 221 at least partially overlaps the protrusion of the protrusion 231, the protrusion 231 can be axially supported by the bus bar 221, which increases the strength of the protrusion 231. The molded resin 23 is not liable to crack when a mounting tool abuts against the surface of the protrusion 231 of the molded resin 23 and applies a pressure, which facilitates assembling the molded stator assembly 2 in the housing 1.As shown in FIG. 2, the bus bar 221 includes a claw portion 2211, and the claw portion 2211 can clamp a coil lead 4 of the stator 21. The claw portion 2211may extend in an axial direction and / or the claw portion 2211may extend in a direction perpendicular to the axial direction. For example, the claw portion 2211 may extend in a circumferential direction. In a cross section perpendicular to the axial direction, the shoulder of the protrusion 231 at least partially overlaps a shoulder of the claw portion 2211. Consequently, when the claw portion 2211 extends along the axial direction, the axial rigidity can be increased, thereby improving the support strength of the protrusion 231. In addition, when the claw portion 2211 extends along a direction perpendicular to the axial direction, a loaded area of the claw portion 2211 in the direction perpendicular to the axial direction can be increased, and the support strength to the protrusion 231 can also be improved. In addition, the covering of the molded resin 23 makes the connection between the claw portion 2211 and the coil lead more reliable.In the present embodiment, the claw portion 2211 may extend into the protrusion 231 in an axial direction. Consequently, the claw portion 2211 has a better support effect on the protrusion 231 and further improves the mechanical strength of the protrusion 231.In the present application, the number of the claw portions 2211 is two or more. For example, the number of the claw portions 2211 is three. Two or more claw portions 2211 are equally spaced in a circumferential direction. Consequently, the claw portions 2211 are equally spaced in the circumferential direction. The protrusions 231 are also equally spaced in the axial direction. Consequently, when the molded stator assembly 2 is pressed into the housing 1 using a mounting tool, the molded stator assembly 2 is evenly loaded, so that the pressing accuracy can be improved. In addition, when three protrusions 231 are formed, a support surface is formed by the surfaces of the three protrusions 231 to ensure stability during the process of pressing the molded stator assembly 2 into the housing 1.FIG. 4 is a schematic diagram of a coil lead 4 in the motor 100 shown in FIG. 1 clamped by a claw portion 2211; and FIG. 5 is a schematic diagram of the coil lead 4 in the motor 100 shown in FIG. 1 not clamped by the claw portion 2211.As shown in FIGS. 4 and 5, the coil leads 4 are arranged in a plurality of groups in the circumferential direction, for example, at least two groups. Each group includes a plurality of coil leads 4. for example, each group includes at least two coil leads 4. the coil leads 4 of the same group are led out from the same tooth pitch 5 and are clamped by the same claw portion 2211. Thus, a winding pattern matching the protrusions 231 can be formed, and the claw portions 2211 facilitate clamping of the coil leads 4 while supporting the protrusions 231.Moreover, the claw portion 2211 includes a first arm portion 221(a) and a second arm portion 221(b) respectively extending in opposite directions in the circumferential direction, and the first arm portion 221(a) and the second arm portion 221(b) respectively clamp different coil leads 4 in the same group. Therefore, the claw portion 2211 has a certain extension in the circumferential direction with an extension direction facing the opposite side, thereby reliably supporting the protrusion 231 with an increased circumferential width and facilitating the supporting of the coil lead.FIG. 6 is a schematic plan view of a stator assembly 2 in the motor 100 shown in FIG. 1 along an axial direction OO'.As shown in FIG. 6, the molded resin 23 is annular and has a radially inner side and a radially outer side respectively corresponding to an inner ring A and an outer ring B of the annular shape. The protrusion 231 extends from the radially outer side to the radially inner side (for example, the protrusion 231 extends in a radial direction). The protrusion 231 may include a main body portion 2311 and a first additional reinforcing portion 2312 disposed on a radial side of the main body portion 2311 in the radial direction. In the circumferential direction, the main body portion 2311 has a width larger than that of the first additional reinforcing portion 2312. Thus, the strength of the protrusion 231 can be secured, and also the amount of the molded resin 23 can be saved.As shown in FIG. 6, the main body portion 2311 is disposed on the radially outer side relative to the first additional reinforcing portion 2312. That is, the protrusion of the main body portion 2311 at least partially overlaps the protrusion of the claw portion 2211. Consequently, a radial position of the main body portion 2311 can be adjusted according to a radial position of the claw portion 2211. Moreover, the claw portion 2211 is located at a position close to the outside in the radial direction, so that sufficient working space can be provided when the coil lead 4 is clamped to the claw portion 2211.In the present application, as shown in FIG. 6, the molded resin 23 also has an additional protrusion 232 on an axial side. The additional protrusion 232 extends from the radially outer side to the radially inner side (for example, the additional protrusion 232 extends along the radial direction) and is disposed between adjacent protrusions 231 in the circumferential direction. Moreover, the additional protrusion 232 has a circumferential width smaller than that of the main body portion 2311. For example, the circumferential width of the additional protrusion 232 may be less than or equal to that of the first additional reinforcing portion 2312. Thereby, the compressive strength of the molded resin can be increased and a resin material can be saved.In the present application, as shown in FIG. 1, the motor 100 may further include a rotor 3. The rotor 3 is configured to oppose the stator assembly 2 in a radial direction. For example, as shown in FIG. 1, the rotor 3 is disposed on the radially inner side of the stator assembly 2. The detailed description of the rotor 3 may relate to related technologies.It is to be noted that the above content is only an exemplary description of the composition and structure of the engine related to the present application, but the present application is not limited thereto, and corresponding variations may also be made based on the above embodiments. Moreover, the above content describes corresponding components only by way of example, but the present application is not limited thereto, and the specific content of the respective components may also relate to related technologies. The engine may also include other components, such as a bearing, etc. For details, related technologies may be referred to, which are omitted herein.The present application is described above in connection with specific implementations, but it should be understood by those skilled in the art that these descriptions are exemplary and are not intended to limit the scope of the present application. Those skilled in the art can make various variations and modifications to the present application according to the spirit and principles of the present application, and these variations and modifications are also within the scope of the present application.The preferred implementations of the present application are 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. Further, since those skilled in the art will wish to think of many modifications and changes, it is not intended to limit the implementations of the present application to the exact shown and described operations and structure, but are intended to cover all suitable modifications and equivalents falling within their scope.

Claims

A motor, comprising: a housing, the housing having an outer circumferential wall extending circumferentially about a central axis, an opening portion on one axial side of the outer circumferential wall, and a bottom surface on the other axial side of the outer circumferential wall; and a stator assembly formed by molding, the stator assembly including: a stator, a bus bar assembly, and a molded resin, the bus bar assembly being supported on the stator, the molded resin covering the bus bar assembly in an axial direction, the bus bar assembly having a metal bus bar, the molded resin being located on one axial side of the stator and having protrusions protruding toward an axial side, in a cross section perpendicular to the axial direction, a protrusion of the bus bar at least partially overlapping a boss of the protrusion, and the molded resin being filled between the bus bar and the protrusion.The motor according to claim 1, wherein the bus bar has claw portions that clamp a coil lead of the stator, and in a cross section perpendicular to the axial direction, the boss of the protrusion at least partially overlaps a boss of a claw portion.The motor according to claim 2, wherein the claw portion extends into the protrusion in the axial direction.The engine according to claim 2 or 3, wherein the number of the claw portions is two or more, and the claw portions are equally spaced in a circumferential direction.The engine according to claim 4, wherein the number of the claw portions is three.The motor according to any one of claims 2 to 5, wherein at least two groups of coil leads are configured in the circumferential direction, each group includes at least two of the coil leads, and the coil leads in the same group are led out from the same pitch and are clamped by the same claw portion.The motor according to claim 6, wherein a claw portion includes a first arm portion and a second arm portion that extend in opposite directions in the circumferential direction, respectively, and the first arm portion and the second arm portion respectively clamp different coil leads in the same group.The motor according to any one of claims 1 to 7, wherein the protrusion extends from a radially outer side to a radially inner side, and includes a main body portion and a first additional reinforcing portion disposed on a radial side of the main body portion, and a width of the main body portion in the circumferential direction is larger than that of the first additional reinforcing portion.The motor according to claim 8, wherein the main body portion is disposed on the radially outer side relative to the first additional reinforcing portion.The motor according to claim 8 or 9, wherein the molded resin also has an additional protrusion on an axial side, the additional protrusion extends from the radially outer side to the radially inner side and is disposed between the adjacent protrusions in the circumferential direction, and the additional protrusion has a circumferential width smaller than that of the main body portion.

Images