Motor

Abstract

To prevent cracking of a front surface of a resin when an assembling tool comes into contact with the front surface of a mold resin and applying a pressure thereto.SOLUTION: A motor comprises: a housing that has an outer peripheral wall extended along a peripheral direction around a center shaft, has an open part on one side in an axial direction of the outer peripheral wall, and has a bottom part on the other side in the axial direction of the outer peripheral wall; and a stator assembly that is provided as a molding formation, and includes a stator, a bus bar assembly, and a mold resin. The bus bar assembly is supported by the stator, the mold resin covers the bus bar assembly in the axial direction, and the bus bar assembly comprises a metal bus bar. The mold resin is positioned at one side in the axial direction of the stator, includes a projection part projected toward one side in the axial direction. In a cross section vertical to the axial direction, a projection of the bus bar and a projection of the projection part are at least partially overlapped. The mold resin 23 is filled between the bus bar and the projection part 231.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present application relates to the mechanical and electrical field, and in particular to motors. [Background technology]

[0002] During the motor installation process, it is usually necessary to assemble a molded stator core and a housing. The conventional method is to press the stator core into the housing from the opening side by abutting a tool against the surface of the molded resin.

[0003] It should be noted that the above description of the technical background is merely provided to facilitate a clear and complete description of the technical methods of the present application and to facilitate the understanding of those skilled in the art, and the above technical methods should not be deemed to be publicly known to those skilled in the art merely because they are described in the background section of the present application. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Chinese Patent No. 111247723 Summary of the Invention [Problem to be solved by the invention]

[0005] The inventors discovered that when installing a motor using the above method, the strength of the resin is insufficient, and there is a risk that the surface of the resin will crack when an assembly tool comes into contact with the surface of the molded resin and applies pressure.

[0006] To solve at least one of the above problems or other similar problems, an embodiment of the present application provides a motor, in which a metal bus bar is provided to axially support a protrusion, the bus bar enhances the strength of the protrusion, and the molded stator assembly is conveniently attached to a housing. [Means for solving the problem]

[0007] According to a first aspect of an embodiment of the present application, there is provided a motor comprising: a housing having an outer peripheral wall extending circumferentially around a central axis, an opening on one axial side of the outer peripheral wall, and a bottom on the other axial side of the outer peripheral wall; and a stator assembly formed by molding, the stator assembly comprising a busbar assembly and a molding resin, the busbar assembly being supported by the stator, the molding resin covering the busbar assembly in the axial direction, the busbar assembly comprising a metal busbar, the molding resin being located on one axial side of the stator and having a protrusion protruding toward one axial side, a projection of the busbar and a projection of the protrusion at least partially overlapping in a cross section perpendicular to the axial direction, and the molding resin being filled between the busbar and the protrusion.

[0008] In at least one embodiment, the busbar has claw portions that clamp coil lead wires of the stator, and in a cross section perpendicular to the axial direction, a projection of the protrusion and a projection of the claw portions at least partially overlap.

[0009] In at least one embodiment, the claw extends axially into the projection.

[0010] In at least one embodiment, the claws are two or more in number and are equidistantly distributed in the circumferential direction.

[0011] In at least one embodiment, the number of prongs is three.

[0012] In at least one embodiment, the coil lead wires are arranged in at least two sets in the circumferential direction, with each set having at least two of the coil lead wires, and the coil lead wires of the same set are pulled out from between the same teeth and clamped by the same claw portion.

[0013] In at least one embodiment, the claw portion has a first arm portion and a second arm portion extending in opposite directions in the circumferential direction, and the first arm portion and the second arm portion each clamp different coil lead wires in the same set.

[0014] In at least one embodiment, the protrusion extends from the radial outside to the radial inside and comprises a main body portion and a first reinforcing portion located on one radial side of the main body portion, and the width of the main body portion in the circumferential direction is greater than the width of the first reinforcing portion.

[0015] In at least one embodiment, the body portion is positioned radially outwardly relative to the first reinforcing portion.

[0016] In at least one embodiment, the molding resin further has an auxiliary protrusion on one axial side, the auxiliary protrusion extending from the radially outer side to the radially inner side and positioned circumferentially between adjacent protrusions, and the circumferential width of the auxiliary protrusion being smaller than the circumferential width of the main body portion. Effect of the Invention

[0017] One beneficial effect of the present embodiment is that the busbars provide axial support for the protrusions, increasing their strength and facilitating mounting of the molded stator assembly to the housing. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is an exploded schematic diagram of a motor 100 according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an assembled schematic diagram of a motor 100 according to an embodiment of the present application. [Diagram 3] FIG. 3 is a cross-sectional view of a part of the motor 100 according to the embodiment of the present application taken along the central axis OO'. [Figure 4] FIG. 4 is a schematic diagram showing how the coil lead wire 4 in the motor 100 shown in FIG. [Diagram 5] FIG. 5 is a schematic diagram of a state in which the coil lead wire 4 in the motor 100 shown in FIG. [Figure 6] FIG. 6 is a schematic diagram of a plan view of the stator assembly 2 in the motor 100 shown in FIG. 1, taken along the axial OO' direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] With reference to the following description and drawings, specific embodiments of the present application are disclosed in detail, demonstrating the manner in which the principles of the present application may be employed. It is to be understood that the embodiments of the present application are not limited thereto in scope. The embodiments of the present application include many changes, modifications and equivalents within the spirit and terms of the appended claims.

[0020] Features described and / or shown in one embodiment may be used in the same or similar manner in one or more other embodiments, may be combined with features in the other embodiments, or may be substituted for features in the other embodiments.

[0021] It must be emphasized that the term "comprising" as used in this specification refers to the presence of features, components, steps or assemblies, but does not exclude the presence or addition of one or more other features, components, steps or assemblies.

[0022] Elements and features described in one drawing or one embodiment of the present application may be combined with elements and features shown in one or more other drawings or embodiments, and in the drawings, like reference numerals represent corresponding parts in the several drawings and may be used to refer to corresponding parts used in more than one embodiment.

[0023] The included drawings are used to provide further understanding of the embodiments of the present application, constitute a part of the specification, are used to illustrate the embodiments of the present application, and together with the written description, explain the principles of the present application. Of course, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without performing creative labor.

[0024] The above and other features of the present application will become apparent from the following specification with reference to the drawings. In the specification and drawings, certain embodiments of the present application are specifically disclosed, showing that some embodiments of the principles of the present application may be employed therein, and it should be understood that the present application is not limited to the described embodiments, but on the contrary, the present application includes all modifications, variations, and equivalents falling within the scope of the appended claims. Various embodiments of the present application will be described below with reference to the drawings. These embodiments are merely illustrative and are not limitations on the present application.

[0025] In the embodiments of the present application, terms such as "first", "second", "upper", "lower" and the like are used to distinguish different elements by designation, but do not represent the spatial arrangement or chronological order of these elements, 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. Terms such as "including", "comprising", "having" and the like refer to the presence of stated features, elements, parts or assemblies, but do not exclude the presence or addition of one or more other features, elements, parts or assemblies.

[0026] In the embodiments of the present application, the singular forms "a," "the," and the like are to be understood broadly to include the plural, such as "one kind," or "one type," and are not limited to the meaning of "one," and the term "said" is to be understood to include both the singular and the plural, unless the context clearly indicates otherwise. Additionally, the term "based on" is to be understood to mean "based at least in part on," and the term "based on" is to be understood to mean "based at least in part on," unless the context clearly indicates otherwise.

[0027] In the following description of the embodiments of the present application, for convenience of explanation, the direction extending along the central axis of the motor or the direction parallel thereto is referred to as the "axial direction", the radial direction centered on the central axis is referred to as the "radial direction", one side farther from the central axis along the radial direction is referred to as the "radial outer side", one side closer to the central axis along the radial direction is referred to as the "radial inner side", and the direction surrounding the central axis is referred to as the "circumferential direction". However, it should be noted that these are merely for convenience of explanation and do not limit the orientation of the motor during use and manufacture.

[0028] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0029] An embodiment of the present application provides a motor.

[0030] FIG. 1 is an exploded schematic view of a motor 100 according to an embodiment of the present application, FIG. 2 is an assembled schematic view of the motor 100 according to an embodiment of the present application, and FIG. 3 is a cross-sectional view of a portion of the motor 100 according to an embodiment of the present application taken along a central axis OO'.

[0031] As shown in FIGS. 1, 2 and 3, a motor 100 includes a housing 1 and a stator assembly 2.

[0032] The housing 1 has an outer peripheral wall 11 extending circumferentially around a central axis OO', and the housing 1 has an opening 111 on one axial side of the outer peripheral wall 11 and a bottom 112 on the other axial side of the outer peripheral wall 11.

[0033] The stator assembly 2 is provided by molding, and includes a stator 21, a busbar assembly 22, and a molding resin 23. Here, the busbar assembly 22 is supported by the stator 21, and the molding resin 23 covers the busbar assembly 22 in the axial direction.

[0034] 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 .

[0035] Molded resin 23 is located on one axial side of stator 21, and has protruding portion 231 protruding toward one axial side. In a cross section perpendicular to the axial direction, a projection of busbar 221 and a projection of protruding portion 231 at least partially overlap each other, and molded resin 23 is filled between busbar 221 and protruding portion 231.

[0036] According to the motor 100 in the embodiment of the present application, a protrusion 231 is provided on the surface of the molded resin 23, and a metallic bus bar 221 is embedded in the protrusion 231. Since the projection of the bus bar 221 and the projection of the protrusion 231 at least partially overlap, the bus bar 221 can provide axial support for the protrusion 231, thereby increasing the strength of the protrusion 231. Therefore, when an assembly tool abuts against the surface of the protrusion 231 of the molded resin 23 and applies pressure, the molded resin 23 is less likely to crack, making it convenient to attach the molded stator assembly 2 to the housing 1.

[0037] As shown in FIG. 2, the bus bar 221 has a claw portion 2211, and the claw portion 2211 can clamp the coil lead wire 4 of the stator 21. The claw portion 2211 can extend along the axial direction and / or the claw portion 2211 can extend along a direction perpendicular to the axial direction, for example, the claw portion 2211 extends along the circumferential direction. In a cross section perpendicular to the axial direction, a projection of the protruding portion 231 and a projection of the claw portion 2211 at least partially overlap each other. In this way, when the claw portion 2211 extends along the axial direction, the rigidity in the axial direction can be increased to increase the support strength for the protruding portion 231, and when the claw portion 2211 extends along a direction perpendicular to the axial direction, the force receiving area of ​​the claw portion 2211 in the direction perpendicular to the axial direction can be increased to increase the support strength for the protruding portion 231. In addition, the coating of the molded resin 23 makes the connection between the claw portion 2211 and the coil lead wire more reliable.

[0038] In the present application, the claw portion 2211 can extend axially into the protruding portion 231. This improves the bearing effect of the claw portion 2211 on the protruding portion 231, further increasing the mechanical strength of the protruding portion 231.

[0039] In the present application, the number of the claws 2211 is two or more, for example, the number of the claws 2211 is three. The two or more claws 2211 are distributed at equal distances in the circumferential direction. As a result, the claws 2211 are distributed at equal distances in the circumferential direction and the protrusions 231 are also distributed at equal distances in the axial direction, so that when the molded stator assembly 2 is press-fitted into the housing 1 using an assembly tool, the molded stator assembly 2 receives a uniform force, and the press-fitting accuracy can be improved. In addition, when three protrusions 231 are formed, one support surface is formed by the surfaces of the three protrusions 231, ensuring stability in the process of press-fitting the molded stator assembly 2 into the housing 1.

[0040] FIG. 4 is a schematic diagram of the motor 100 shown in FIG. 1 in which the coil lead-out wire 4 is clamped by the claw portion 2211, and FIG. 5 is a schematic diagram of the motor 100 shown in FIG. 1 in which the coil lead-out wire 4 is not clamped by the claw portion 2211.

[0041] 4 and 5, the coil lead wires 4 are arranged in a plurality of sets in the circumferential direction, for example at least two sets, with each set including a plurality of coil lead wires 4, for example at least two coil lead wires 4, and the coil lead wires 4 of the same set are drawn out from the same gap 5 between teeth and clamped by the same claw portion 2211. This makes it possible to form a winding form that fits the protruding portion 231, and makes it convenient for the claw portion 2211 to support the protruding portion 231 and at the same time clamp the coil lead wire 4.

[0042] Furthermore, the claw portion 2211 has a first arm portion 2211(a) and a second arm portion 2211(b) that extend in opposite circumferential directions, and the first arm portion 2211(a) and the second arm portion 2211(b) each clamp a different coil lead wire 4 in the same set. As a result, the claw portion 2211 has a certain extension in the circumferential direction, and the extension directions face opposite sides, which reliably supports the protruding portion 231 with a larger circumferential width, and is convenient for supporting the coil lead wire.

[0043] FIG. 6 is a schematic diagram of a plan view of the stator assembly 2 in the motor 100 shown in FIG. 1, taken along the axial OO' direction.

[0044] 6, the molded resin 23 has an annular shape, and the radially inner side and the radially outer side correspond to the annular inner ring A and outer ring B, respectively. The protruding portion 231 extends from the radially outer side to the radially inner side (for example, the protruding portion 231 extends along the radial direction), and the protruding portion 231 may include, in the radial direction, a main body portion 2311 and a first reinforcing portion 2312 located on one radial side of the main body portion 2311. The width of the main body portion 2311 in the circumferential direction is larger than the width of the first reinforcing portion 2312. This ensures the strength of the protruding portion 231 and also saves the amount of molded resin 23 used.

[0045] 6, the main body portion 2311 is located radially outward from the first reinforcing portion 2312, that is, the projection of the main body portion 2311 and the projection of the claw portion 2211 at least partially overlap each other. This makes it possible to set the position of the main body portion 2311 in the radial direction by adjusting the position of the claw portion 2211 in the radial direction, and the claw portion 2211 is located at a position closer to the outer side in the radial direction, providing a sufficient working space when the claw portion 2211 is caused to clamp the coil lead wire 4.

[0046] 6, the molded resin 23 further has an auxiliary protrusion 232 on one side in the axial direction, and the auxiliary protrusion 232 extends from the radially outer side to the radially inner side (for example, the auxiliary protrusion 232 extends along the radial direction) and is located between adjacent protrusions 231 in the circumferential direction, and the circumferential width of the auxiliary protrusion 232 is smaller than the circumferential width of the main body portion 2311, and for example, the circumferential width of the auxiliary protrusion 232 may be equal to or smaller than the circumferential width of the first reinforcing portion 2312. This makes it possible to increase the pressure-receiving strength of the molded resin and save resin material.

[0047] In the present application, as shown in Fig. 1, the motor 100 may further include a rotor 3, and the rotor 3 is disposed so as to be radially opposed to the stator assembly 2. For example, as shown in Fig. 1, the rotor 3 is located radially inside the stator assembly 2. For a detailed description of the rotor 3, reference may be made to the related art.

[0048] It is worth noting that the above is merely an exemplary description of the configuration and structure of the motor related to the present application, but the present application is not limited thereto, and appropriate modifications can be made based on the above embodiments. In addition, the above is merely an exemplary description of each member, but the present application is not limited thereto, and the specific content of each member can be referred to the related art, and the motor can include other configurations such as bearings, and the specific details can be referred to the related art, and the description will be omitted here.

[0049] Although the present application has been described above with reference to specific embodiments, those skilled in the art should clearly understand that these descriptions are merely illustrative and do not limit the scope of protection of the present application. Those skilled in the art can make various modifications and alterations to the present application based on the spirit and principles of the present application, and these modifications and alterations are also within the scope of the present application.

[0050] The preferred embodiments of the present application have been described above with reference to the drawings. Many features and advantages of these embodiments are apparent from the detailed description, and the appended claims are therefore intended to cover all such features and advantages of these embodiments that fall within their true spirit and scope. In addition, since those skilled in the art can easily think of many modifications and changes, the embodiments of the present application are not limited to the exact structure and operation illustrated and described, but can include all appropriate modifications and equivalents that fall within the scope thereof. [Explanation of symbols]

[0051] REFERENCE SIGNS LIST 1...housing, 2...stator assembly, 4...coil lead wire, 5...inter-tooth gap, 11...outer peripheral wall, 21...stator, 22...busbar assembly, 23...molding resin, 100...motor, 111...opening, 112...bottom, 221...busbar, 231...projection, 232...auxiliary projection, 2211...claw, 2211(a)...first arm, 2211(b)...second arm, 2311...main body, 2312...first reinforcing portion, OO'...central axis

Claims

1. In the motor, a housing having an outer peripheral wall extending in a circumferential direction around a central axis, an opening on one side of the outer peripheral wall in an axial direction, and a bottom on the other side of the outer peripheral wall in the axial direction; A stator assembly provided by molding, the stator assembly including a stator, a bus bar assembly, and a molding resin; Equipped with the bus bar assembly is supported by the stator, and the molding resin covers the bus bar assembly in an axial direction; the bus bar assembly comprises a metal bus bar; the molding resin is located on one side of the stator in the axial direction and has a protruding portion protruding toward the one side in the axial direction, In a cross section perpendicular to the axial direction, a projection of the bus bar and a projection of the protrusion at least partially overlap each other, The motor is characterized in that the molding resin is filled between the bus bar and the protrusion.

2. the bus bar has claw portions that hold coil lead wires of the stator, The motor according to claim 1 , wherein a projection of the protrusion and a projection of the claw at least partially overlap each other in a cross section perpendicular to the axial direction.

3. 3. The motor according to claim 2, wherein the claw portion extends axially into the protrusion.

4. 3. The motor according to claim 2, wherein the number of said claws is two or more and the claws are distributed at equal intervals in the circumferential direction.

5. 5. The motor according to claim 4, wherein the number of said claws is three.

6. 3. The motor according to claim 2, wherein the coil lead wires are arranged in at least two sets in the circumferential direction, each set having at least two of the coil lead wires, the coil lead wires of the same set being pulled out from between the same teeth and clamped by the same claw portion.

7. 7. The motor according to claim 6, wherein the claw portion has a first arm portion and a second arm portion extending in opposite directions in the circumferential direction, and the first arm portion and the second arm portion each clamp different coil lead wires in the same set.

8. The motor described in claim 2, characterized in that the protrusion extends from the radial outside to the radial inside, and comprises a main body portion and a first reinforcing portion located on one radial side of the main body portion, and the width of the main body portion in the circumferential direction is larger than the width of the first reinforcing portion.

9. The motor according to claim 8 , wherein the main body portion is positioned radially outward from the first reinforcing portion.

10. the molding resin further has an auxiliary protruding portion on one side in the axial direction, the auxiliary protruding portion extending from a radially outer side to a radially inner side and being located between adjacent protruding portions in the circumferential direction, The motor according to claim 8, wherein a circumferential width of the auxiliary protrusion is smaller than a circumferential width of the main body.

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