Motor and electrical product
By setting through holes on the bus bar cage and injecting glue, the problem of airtightness of the motor when temperature changes is solved, and the stable positioning of the bus bar and the improvement of airtightness is achieved.
Patent Information
- Application Number
- CN202410020948.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-05
- Publication Date
- 2025-07-08
AI Technical Summary
When the temperature of the existing motor changes, due to the different expansion coefficients of the bus bar and bus bar cage, gas leaks inside the motor, affecting the air tightness and performance.
An exposed through hole is provided on the bus bar cage, and glue is injected into the through hole to interrupt the air leakage passage, and the bus bar is positioned using the through hole.
The airtightness of the motor is improved, and the positioning effect of glue ensures the stability of the bus bar, prevents gas leakage, and maintains the performance of the motor.
Smart Images
Figure CN120281132A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electromechanics, and particularly to a motor and an electrical product. Background Art
[0002] In existing motors, the motor usually has a bus bar holder for carrying the bus bar, and the bus bar is formed in the bus bar holder by insert molding. For some motors, such as air suspension motors, high pressure is required inside, and the airtightness inside the motor is required to be very high.
[0003] It should be noted that the above introduction to the technical background is only for the convenience of clearly and completely explaining the technical solution of this application and facilitating the understanding of those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art just because these solutions are described in the background art part of this application. Summary of the Invention
[0004] The inventors found that for a motor with the above structure, thermal expansion and contraction are likely to occur when the temperature changes. Due to the different expansion coefficients of the bus bar and the bus bar holder, when the temperature changes, the volume and length change amounts of the bus bar and the bus bar holder are different, which easily causes the gas inside the motor to leak out along the bus bar from the bus bar holder, affecting the airtightness of the motor and thus affecting the performance of the motor.
[0005] To solve at least one of the above problems or other similar problems, an embodiment of this application provides a motor. By providing a through hole exposing the bus bar on the bus bar holder and injecting glue into the through hole to interrupt the air leakage channel. Thus, the airtightness inside the motor can be ensured, and the bus bar can also be positioned by using the through hole.
[0006] According to one aspect of the embodiments of this application, a motor is provided. The motor has a bus bar and a bus bar holder for carrying the bus bar. The bus bar holder has an annular main body portion. The main body portion of the bus bar holder has a through hole. A part of the main body portion of the bus bar protrudes from the through hole. The through hole is filled with glue after the insert molding of the bus bar holder.
[0007] In some embodiments, the main body portion of the bus bar is a sheet-like structure, and the height of the main body portion of the bus bar in the axial direction is greater than the thickness of the main body portion of the bus bar.
[0008] In some embodiments, the number of the bus bars is multiple, each bus bar corresponds to at least one through hole, and / or, one through hole corresponds to at least one bus bar.
[0009] In some embodiments, the length of the through hole in the circumferential direction is greater than the width of the main body portion of the bus bar, and the distance between the side of the through hole closer to the central axis of the motor and the side farther from the central axis is greater than the thickness of the main body portion of the bus bar.
[0010] In some embodiments, one axial side of the through hole has a chamfered structure.
[0011] In some embodiments, the height of the glue filled into the through hole is located between the edge of one axial side of the chamfered structure and the edge of the other axial side of the chamfered structure.
[0012] In some embodiments, the other axial side of the through hole has a chamfered structure.
[0013] In some embodiments, the forming die of the bus bar holder clamps the main body portion of the bus bar in the axial direction. After injecting resin into the forming die, the bus bar holder is formed, and the position of the forming die axially opposed to the through hole axially positions the bus bar.
[0014] In some embodiments, the glue is a sealing silica gel.
[0015] According to another aspect of the embodiments of the present application, an electrical product is provided, and the electrical product includes the motor according to any one of the foregoing embodiments.
[0016] One of the beneficial effects of the embodiments of the present application is that by providing a through hole exposing the bus bar on the bus bar holder of the motor and injecting glue into the through hole, thereby, the airtightness inside the motor can be ensured, and at the same time, the bus bar can be positioned by using this through hole.
[0017] Referring to the following description and the accompanying drawings, the embodiments of the present application are disclosed in detail. It should be understood that the embodiments of the present application are not limited in scope thereby. Within the spirit and terms of the appended claims, the embodiments of the present application include many changes, modifications, and equivalents.
[0018] Features described and / or illustrated for one embodiment can be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.
[0019] It should be emphasized that the term "comprising / including / having" when used herein refers to the presence of features, whole parts, or components, but does not exclude the presence or addition of one or more other features, whole parts, or components. Description of the Drawings
[0020] The above and other objects, features, and advantages of the embodiments of the present application will become more apparent from the following detailed description in conjunction with the accompanying drawings, in which:
[0021] Figure 1 is a schematic diagram of a motor according to an embodiment of the present application;
[0022] Figure 2 is a schematic diagram of a bus bar of a motor according to an embodiment of the present application;
[0023] Figure 3 is a schematic diagram of a bus bar holder carrying a bus bar of a motor according to an embodiment of the present application;
[0024] Figure 4 is a top view of a bus bar and a bus bar holder of a motor according to an embodiment of the present application;
[0025] Figure 5 is a top view of a through hole according to an embodiment of the present application;
[0026] Figure 6 is an axial sectional view of a through hole according to an embodiment of the present application;
[0027] Figure 7 is a schematic diagram of forming a bus bar holder using a forming die;
[0028] Figure 8 is another schematic diagram of forming a bus bar holder using a forming die. Detailed Embodiments
[0029] Referring to the accompanying drawings, through the following description, the foregoing and other features of the present application will become apparent. In the description and drawings, specific embodiments of the present application are specifically disclosed, which show some embodiments in which the principles of the present application can be adopted. It should be understood that the present application is not limited to the described embodiments, but includes all modifications, variations, and equivalents falling within the scope of the appended claims.
[0030] In the embodiments of the present application, terms such as "first", "second", "upper", "lower", etc. are used to distinguish different elements in terms of name, but do not represent the spatial arrangement or time sequence of these elements, and these elements should not be limited by these terms. The term "and / or" includes any one and all combinations of one or more of the associated listed terms. The terms "comprising", "including", "having", etc. mean the presence of the stated features, elements, components, or assemblies, but do not exclude the presence or addition of one or more other features, elements, components, or assemblies.
[0031] In the embodiments of the present application, singular forms such as "a" and "the" include plural forms and should be broadly understood as "a kind of" or "a class of" rather than being limited to the meaning of "one"; in addition, the term "said" should be understood to include both singular and plural forms unless the context clearly indicates otherwise. In addition, the term "according to" 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.
[0032] In addition, in the following description of the embodiments of the present application, for the convenience of description, 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", the direction around the central axis is referred to as the "circumferential direction", the side away from the central axis along the radial direction is referred to as the "radial outer side", the side close to the central axis along the radial direction is referred to as the "radial inner side", the direction from the bottom of the motor housing along the axial direction to the opening of the motor housing is referred to as the "axial one side" or "axial upper side" or "upper side" or "above", and the direction from the opening of the motor housing along the axial direction to the bottom of the motor housing is referred to as the "axial other side" or "axial lower side" or "lower side" or "below". It should be noted, however, that these are only for the convenience of description and do not limit the orientation of the motor during use and manufacturing.
[0033] The embodiments of the present application will be described below with reference to the accompanying drawings.
[0034] Embodiments of the first aspect
[0035] The embodiments of the present application provide a motor, Figure 1 which is a schematic diagram of the motor of the embodiments of the present application, Figure 2 which is a schematic diagram of the bus bar of the motor of the embodiments of the present application, Figure 3 which is a schematic diagram of the bus bar holder carrying the bus bar of the motor of the embodiments of the present application.
[0036] As Figure 1 shown, the motor 10 of the embodiments of the present application includes a bus bar 20 and a bus bar holder 30. As Figure 2 shown, the bus bar 20 has an arc-shaped main body portion 21. As Figure 3 shown, the bus bar holder 30 has an annular main body portion 31.
[0037] In the embodiments of the present application, as Figure 3 shown, the main body portion 31 of the bus bar holder 30 has a through hole 32, and a part of the main body portion 21 of the bus bar 20 is exposed from the through hole 32. The through hole 32 is filled with glue after the bus bar holder 30 is insert-molded.
[0038] According to the above embodiments, the airtightness of the bus bar holder is improved by injecting glue, preventing the pressure inside the motor from flowing out from the power terminal of the bus bar along the wire clamping terminal of the bus bar, interrupting the air leakage channel, and thus ensuring the airtightness inside the motor. In addition, since a part of the main body portion 21 of the bus bar 20 is exposed from the through hole 32, the bus bar 20 can also be positioned by using the through hole 32.
[0039] In the embodiments of the present application, as Figure 3 shown, in addition to having a generally arc-shaped main body portion 21, the bus bar 20 further has a wire clamping terminal 22 extending radially inward from the radially inner side of one end of the main body portion 21 and a power terminal 23 extending axially from the other end of the main body portion 21. The present application is not limited to this, and the wire clamping terminal 22 and the power terminal 23 of the bus bar 20 may also have other structures, and the wire clamping terminal 22 and the power terminal 23 may also extend from other positions. For details, reference may be made to the related art, and the description is omitted here.
[0040] In some embodiments, as Figure 2 shown, the main body portion 21 of the bus bar 20 is a sheet structure, the width direction thereof is parallel to the axial direction, and the thickness direction thereof is perpendicular to the axial direction. That is, in the bus bar holder 30, the sheet-shaped bus bar 20 is placed longitudinally, that is, the distance of the main body portion 21 of the bus bar 20 in the axial direction (that is, the width of the main body portion 21 of the bus bar 20) is greater than the distance of the main body portion 21 of the bus bar 20 in the radial direction (that is, the thickness of the main body portion 21 of the bus bar 20). Thus, it is convenient to uniformly apply glue around the bus bar 20 through the through hole 32.
[0041] In some embodiments, the number of bus bars 20 may be multiple. In the Figure 2 example of Figure 2 and Figure 3 shown, taking three bus bars 20 as an example, each bus bar 20 may correspond to at least one through hole 32, and / or each through hole 32 corresponds to at least one bus bar 20. As Figure 2 shown, the two bus bars 20 on the left correspond to Figure 3 the one through hole 32 on the left side, Figure 2 and the one bus bar 20 on the right corresponds to Figure 3 the one through hole 32 on the right side. That is, Figure 3 the through hole 32 on the left side corresponds to two bus bars 20, Figure 3 and the through hole 32 on the right side corresponds to one bus bar 20. Thus, the channels of each bus bar 20 can be accurately sealed, further ensuring the airtightness of the motor.
[0042] In Figure 2 and Figure 3In the example, taking the case where two through holes 32 are provided on the main body portion 31 of the bus bar cage 30 as an example, the present application is not limited thereto, and other numbers of through holes 32 may also be provided on the main body portion 31 of the bus bar cage 30, as long as each bus bar 20 can correspond to at least one through hole 32, so that the channels of each bus bar 20 can be sealed by injecting glue into the through holes 32.
[0043] Figure 4 is a top view of the bus bar and the bus bar cage of the motor according to an embodiment of the present application; Figure 5 is a top view of the through hole according to an embodiment of the present application, and is also Figure 4 a partial enlarged schematic view of the dashed box shown.
[0044] In some embodiments, such as Figure 4 and Figure 5 shown, the length d1 of the through hole 32 in the circumferential direction is greater than the width of the main body portion 21 of the bus bar 20, and the distance d2 between the side closer to the central axis of the motor 10 (i.e., the inner side E1 of the through hole 32) and the side farther from the central axis of the motor 10 (i.e., the outer side E2 of the through hole 32) of the through hole 32 is greater than the thickness of the main body portion 21 of the bus bar 20. Thus, enough space can be left to inject glue, ensuring the length and width of the glue injection to enhance the sealing performance.
[0045] In the above embodiment, taking the length d1 of the through hole 32 in the circumferential direction as the length of the inner side of the through hole 32 in the circumferential direction as an example, the present application is not limited thereto, and the length d1 of the through hole 32 in the circumferential direction may also be the length of the outer side of the through hole 32 in the circumferential direction. In addition, in the above embodiment, taking the length of the inner side of the through hole 32 in the circumferential direction as less than the length of the outer side of the through hole 32 in the circumferential direction as an example, the present application is not limited thereto, and the length of the inner side of the through hole 32 in the circumferential direction may also be greater than or equal to the length of the outer side of the through hole 32 in the circumferential direction. Thus, the flexibility of the setting of the through hole 32 is improved.
[0046] Figure 6 is an axial cross-sectional view of the through hole according to an embodiment of the present application.
[0047] In some embodiments, such as Figure 6 shown, one axial side of the through hole 32 ( Figure 6 the upper side shown) has a chamfer structure 33(a). Thus, it is possible to facilitate the pouring of glue and prevent the glue from flowing out of the through hole.
[0048] In some examples, the chamfer may be provided only at a partial position on one axial side of the through hole 32. For example, the chamfer is provided only at the position where the glue is poured. Thus, it is also possible to prevent the glue from flowing out of the through hole. The setting position of the chamfer depends on specific requirements, and the present application does not make any restrictions.
[0049] In the above embodiments, the inclination angle of the chamfer structure 33(a) is not limited and can be set according to the size of the through hole 32. For example, the larger the opening of the through hole 32, the smaller the inclination angle with respect to the axial direction ( Figure 6 the up-and-down direction shown), and the smaller the opening of the through hole 32, the larger the inclination angle with respect to the axial direction ( Figure 6 the up-and-down direction shown). In this way, the convenience of injecting glue can be ensured even when the opening of the through hole 32 is small. In addition, the inclination angle of the chamfer structure 33(a) can also be set according to the viscosity of the glue. For example, the higher the viscosity, the larger the inclination angle with respect to the axial direction, and the lower the viscosity, the smaller the inclination angle with respect to the axial direction. Thus, the convenience of injecting glue can also be ensured.
[0050] In some embodiments, as Figure 6 shown, the height of the glue filled into the through hole 32 is between the edge S1 on one axial side of the chamfer structure 33(a) and the edge S2 on the other axial side of the chamfer structure 33(a). With this structure, since a part of the glue is injected onto the chamfer structure 33(a), compared with the glue injected into the part of the through hole 32 without the chamfer structure, in the Figure 6 left-right direction (the direction perpendicular to the axial direction, such as the radial direction) shown, the dimension is larger, which can further play a role in preventing the glue from falling off and can also prevent the glue from flowing to places outside the through hole and contaminating the motor.
[0051] In the above embodiments, taking the glue injection between S1 and S2 as an example, the present application is not limited thereto. The glue can also be injected to S2, that is, the edge on the other axial side of the chamfer structure 33(a). In this way, it can also prevent the glue from flowing outside the through hole 32 and contaminating the motor.
[0052] In some embodiments, as Figure 6 shown, the other axial side of the through hole 32 is a chamfer structure 33(b). Thereby, it can prevent the glue from falling off after forming and increase the firmness of the glue.
[0053] In some examples, before injecting the glue, a tape can be pasted on the other axial side of the through hole 32 to prevent the glue from leaking out from the other axial side of the through hole. After the glue solidifies, the tape is torn off to increase the reliability of the glue. Protrusions or ribs can also be provided on the chamfer structure 33(b) on the other axial side of the through hole 32 to prevent the glue from leaking out from the other axial side of the through hole and prevent the glue from falling off.
[0054] Figure 7 is a schematic diagram of forming a bus bar holder using a forming mold, Figure 8 is another schematic diagram of forming a bus bar holder using a forming mold.
[0055] In some embodiments, as Figure 7 shown, the forming die 40 of the bus bar holder 30 axially clamps the main body portion 21 of the bus bar, as Figure 8 shown, after injecting resin into the forming die 40, the bus bar holder 30 is formed. Since the portions 41, 42 of the forming die 40 that are axially opposed to the through hole 32 form the through hole 32 after demolding, the bus bar 20 is axially positioned through the through hole 32. Thus, the positioning of the bus bar is realized by using the forming die 40 of the bus bar holder 30, and additional positioning jigs are reduced.
[0056] In some embodiments, the glue injected into the through hole 32 is sealing silicone. This application is not limited thereto, and the glue may also be other substances having a sealing function, which are liquid when injected but can solidify into a solid state after a period of time.
[0057] In the above embodiments, the material of the bus bar 20 is, for example, copper, and the linear expansion coefficient of copper is 1.7×10 -5 , the material of the bus bar holder 30 is, for example, resin PBT, and the linear expansion coefficient of resin PBT is 9×10 -5 , due to the different expansion coefficients, gaps are likely to occur between the bus bar 20 and the bus bar holder 30 at different temperatures. The elongation rate of resin PBT is 2.6%, and the elongation rate of the sealing silicone is 290%. The elongation rate of the sealing silicone is much greater than that of the resin. The tensile strength between the cured sealing silicone and the bus bar 20 is about 3.2 N / mm 2 . It can be seen that the sealing silicone has strong adhesiveness relative to the resin and good tensile properties at the same time. Therefore, it can ensure the airtightness inside the motor in an environment with temperature changes.
[0058] In some examples, other materials with stronger adhesiveness and better tensile properties relative to the resin can be used as the sealing glue to achieve the effect of ensuring the airtightness inside the motor. The setting of the glue material depends on specific requirements, and this application does not make any restrictions.
[0059] It should be noted that only the structure of the motor related to this application is described above. The motor may further include other components, such as a stator, a rotor, a bearing, a housing, etc. For details, reference can be made to the related art, and the description is omitted here.
[0060] As can be seen from the above embodiments, by providing a through hole for exposing the bus bar in the bus bar holder and injecting glue into the through hole, the air leakage channel in the bus bar holder can be interrupted, thereby ensuring the airtightness inside the motor.
[0061] Embodiments of the second aspect
[0062] An embodiment of the present application provides an electrical product. The electrical product has the motor described in the embodiment of the first aspect. Since the structure of the motor has been described in the embodiment of the first aspect, the content thereof is incorporated herein and will not be repeated here.
[0063] The embodiments of the present application have been described in detail with reference to the accompanying drawings, indicating the ways in which the principles of the present application can be adopted. However, it should be understood that the implementation of the present application is not limited to the above-described embodiments, and also includes all changes, modifications, and equivalents that do not depart from the scope of the gist of the present application.
Claims
1. A motor, the motor having a bus bar and a bus bar holder carrying the bus bar, the bus bar having an arcuate main body portion, the bus bar holder having an annular main body portion, characterized in that, the main body portion of the bus bar holder has a through hole, a part of the main body portion of the bus bar protrudes from the through hole, the through hole is filled with glue after the bus bar holder is insert-molded.
2. The motor according to claim 1, characterized in that, the main body portion of the bus bar is a sheet-like structure, and the height of the main body portion of the bus bar in the axial direction is greater than the thickness of the main body portion of the bus bar.
3. The motor according to claim 1, characterized in that, the number of the bus bars is plural, each bus bar corresponding to at least one of the through holes, and / or, one through hole corresponding to at least one of the bus bars.
4. The motor according to claim 1, characterized in that, the length of the through hole in the circumferential direction is greater than the width of the main body portion of the bus bar, and the distance between the side of the through hole closer to the central axis of the motor and the side farther from the central axis is greater than the thickness of the main body portion of the bus bar.
5. The motor according to claim 1, characterized in that, one axial side of the through hole is a chamfered structure.
6. The motor according to claim 5, characterized in that, the height of the glue filled into the through hole is between the edge on one axial side of the chamfered structure and the edge on the other axial side of the chamfered structure.
7. The motor according to claim 1, characterized in that, the other axial side of the through hole is a chamfered structure.
8. The motor according to claim 2, characterized in that, the molding die of the bus bar holder clamps the main body portion of the bus bar in the axial direction, and the bus bar holder is formed after injecting resin into the molding die, the position of the molding die axially opposed to the through hole axially positions the bus bar.
9. The motor according to any one of claims 1 to 8, characterized in that, the glue is a sealing silica gel.
10. An electrical product, characterized in that, The electrical product includes the motor according to any one of claims 1 to 9.