Inner rotor motor and method for assembling inner rotor motor

Abstract

The embodiment of the invention provides an inner rotor motor and an assembling method of the inner rotor motor. The motor includes: a housing including an opening and a bottom; a bus bar unit including a metal bus bar, the metal bus bar including a power supply terminal; and the rotor is positioned in the shell and is arranged around a rotating shaft. The bus bar unit is located between the bottom of the housing and the rotor, and at least a portion of at least one of the power supply terminals and the rotor are axially opposed to each other. Therefore, the radial dimension of the output side of the motor can be effectively reduced.

Description

Technical Field

[0001] The present application relates to the electromechanical field, and particularly to an inner rotor motor and an assembly method thereof. Background Art

[0002] In the existing EPS (Electric Power Steering) motor, the motor housing usually has a bottom and an opening. The bus bar assembly is mounted on the stator. The bus bar assembly is annular, and its inner diameter is larger than the outer diameter of the rotor. When assembling the motor housing, rotor, stator, and bus bar assembly, usually the stator with the bus bar assembly is first inserted into the housing from the opening side of the motor. The stator is located on one side of the bottom of the housing, and the bus bar is located on the opening side of the motor. Then the rotor is inserted into the bus bar assembly and the stator from the opening of the housing.

[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 solutions of the present 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 the present application. Summary of the Invention

[0004] The inventors found that for a motor with the above structure, the power terminals usually extending from the bus bar assembly are located radially outside the rotor. However, in the case where there are requirements for the radial dimension of the motor output side, when adopting this structure, due to the limitation of the assembly sequence, it is impossible to effectively reduce the radial dimension of the motor output side.

[0005] To solve at least one of the above problems or other similar problems, the embodiments of the present application provide an inner rotor motor and an assembly method thereof. By arranging at least one of the power terminals on the motor output side closer to the bearing located at the center of the motor than in the conventional structure, it is axially opposed to the motor rotor. Thereby, both the radial dimension of the motor output side is reduced, and the motor assembly is facilitated.

[0006] According to one aspect of the embodiments of the present application, there is provided an inner rotor motor, including: a housing having an opening and a bottom; a bus bar unit having a metal bus bar, the metal bus bar having a power terminal and a rotor; and a rotor located inside the housing and arranged around a rotation axis; the bus bar unit is located between the bottom of the housing and the rotor, and at least a part of at least one of the power terminals is axially opposed to the rotor.

[0007] In some embodiments, the metal bus bar further includes an annular main body portion electrically connected to the power terminal, and the inner diameter of the main body portion is smaller than the outer diameter of the rotor.

[0008] In some embodiments, at least a portion of at least one of the power terminals is radially inward of the main body portion.

[0009] In some embodiments, the power terminal is connected to the main body portion on the radially outer side of the main body portion, and the power terminal and the main body portion are integrally formed.

[0010] In some embodiments, the metal bus bar further includes:

[0011] A connecting portion located on the radially outer side of the main body portion; and

[0012] A coil clamping portion extending from the main body portion toward the radially outer side, including a wall portion and a claw portion provided at the radially outer end of the wall portion;

[0013] The power terminal is disposed in the connecting portion, and the connecting portion and the claw portion are axially offset.

[0014] In some embodiments, the bottom of the housing has a housing through-hole provided around the central axis of the rotation axis, and at least one of the power terminals passes through the housing through-hole; the motor further includes a stator located inside the housing, and the stator and the rotor are disposed opposite to each other in the radial direction; the radial position where the edge of the housing through-hole is located is closer to the radially inner side than the central position of the stator in the radial direction.

[0015] In some embodiments, the motor further includes an induction magnetic ring located above the rotation axis and axially above the housing through-hole.

[0016] In some embodiments, a cover portion is disposed outside the bottom of the housing, the cover portion abuts against the bottom of the housing and is sleeved on the outer periphery of the housing, the cover portion has a cover portion through-hole, and the power terminal and the cover portion through-hole are axially opposed and pass through the cover portion through-hole.

[0017] In some embodiments, the motor further includes a bearing provided around the rotation axis; the radial distance between at least one of the power terminals and the bearing is below a certain distance.

[0018] According to another aspect of the embodiments of the present application, an assembling method of an inner rotor motor is provided, and the assembling method includes:

[0019] Disposing the stator carrying the bus bar unit in the housing, with the side carrying the bus bar unit facing the bottom of the housing, and exposing the power terminal at the bottom of the housing;

[0020] Inserting the rotor into the stator from the opening of the housing, and making at least a portion of at least one of the power terminals axially opposed to the rotor.

[0021] One of the beneficial effects of the embodiments of the present application is that at least one power terminal among the power terminals on the output side of the motor is arranged closer to the bearing located at the center of the motor than in the conventional structure, so that the bearing faces the motor rotor upward. Thus, both the radial dimension on the output side of the motor is reduced, and the motor assembly is facilitated. During assembly, the stator carrying the bus bar assembly is inserted into the bottom side of the motor housing, the bus bar assembly is pressed in towards the bottom of the motor housing, the power terminals are exposed from the bottom of the housing, and then the rotor is inserted into the stator through the opening of the housing so that the rotor is axially opposed to the power terminals.

[0022] The embodiments of the present application are disclosed in detail with reference to the following description and drawings. 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.

[0023] 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 the features in other embodiments, or replace the features in other embodiments.

[0024] It should be emphasized that the term "comprising / including / having" as 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] From the following detailed description in conjunction with the drawings, the above and other objects, features, and advantages of the embodiments of the present application will become more apparent. In the drawings:

[0026] Figure 1 is a schematic diagram of an inner rotor motor according to an embodiment of the present application;

[0027] Figure 2 is an axial sectional view of an inner rotor motor according to an embodiment of the present application;

[0028] Figure 3 is a top view of the metal bus bar of the bus bar unit of the inner rotor motor according to an embodiment of the present application;

[0029] Figure 4 is a side view of the metal bus bar of the bus bar unit of the inner rotor motor according to an embodiment of the present application;

[0030] Figure 5 is a schematic diagram of the bottom of the motor housing of the inner rotor motor according to an embodiment of the present application;

[0031] Figure 6 is a schematic diagram of the rotor of the inner rotor motor according to an embodiment of the present application;

[0032] Figure 7 It is a schematic diagram of an assembly method of an inner rotor motor according to an embodiment of the present application;

[0033] Figure 8 It is a schematic diagram of an assembly process of an assembly method of an inner rotor motor according to an embodiment of the present application. Detailed implementation manners

[0034] 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, equivalents and alternatives falling within the scope of the appended claims.

[0035] 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 indicate 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.

[0036] In the embodiments of the present application, the singular forms "a", "the", etc. include the plural forms and should be broadly understood as "a kind" or "a class" rather than being limited to the meaning of "one"; in addition, the term "the" should be understood to include both the singular form and the plural form 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.

[0037] 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 called "axial direction", the radial direction centered on the central axis is called "radial direction", the direction around the central axis is called "circumferential direction", the side far from the central axis along the radial direction is called "radial outer side", the side close to the central axis along the radial direction is called "radial inner side", the direction pointing from the bottom of the motor housing along the axial direction to the opening of the motor housing is called "the other axial side" or "axial lower side" or "lower side" or "downward", and the direction pointing from the opening of the motor housing along the axial direction to the bottom of the motor housing is called "axial one side" or "axial upper side" or "upper side" or "upward". 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 manufacture.

[0038] The embodiments of the present application will be described below with reference to the accompanying drawings.

[0039] Embodiments of the first aspect

[0040] The embodiments of the present application provide an inner rotor motor. Figure 1 It is a schematic diagram of the inner rotor motor according to the embodiment of the present application, Figure 2 It is an axial sectional view of the inner rotor motor according to the embodiment of the present application.

[0041] As Figure 1 and Figure 2 shown, the inner rotor motor according to the embodiment of the present application includes a housing 10, a bus bar unit 20, and a rotor 30. The housing 10 has an opening 11 and a bottom 12. The bus bar unit 20 has a metal bus bar 21 and power terminals 22. The rotor 30 is located inside the housing 10 and is arranged around the rotation axis 31.

[0042] In the embodiment of the present application, as Figure 2 shown, the bus bar unit 20 is located between the bottom 12 of the housing and the rotor 30. The number of power terminals 22 is multiple, for example, three. At least a part of at least one power terminal 22 is axially opposed to the rotor 30, so that at least one power terminal 22 is closer to the bearing located at the center of the motor than in the conventional structure. Thus, the radial dimension of the motor is reduced.

[0043] Figure 3 It is a top view of the metal bus bar of the bus bar unit of the motor according to the embodiment of the present application, Figure 4 It is a side view of the metal bus bar of the bus bar unit of the motor according to the embodiment of the present application.

[0044] In some embodiments, as Figure 3 and Figure 4 shown, the metal bus bar 21 has an annular main body portion 23. The main body portion 23 is electrically connected to the power terminals 22, and the inner diameter of the main body portion 23 is smaller than the outer diameter of the rotor 30. That is, the radially innermost side of the main body portion 23 is closer to the central axis than the radially outermost side of the rotor 30. Thus, the power terminals 22 can be arranged closer to the central axis, and the radial dimension of the motor can be further reduced.

[0045] In some embodiments, at least one part of at least one power terminal 22 is closer to the radially inner side than the above-mentioned main body portion 23. For example, as Figure 4 shown, the power terminal 22-1 is closer to the radially inner side than the main body portion 23. Thus, the radial dimension of the output side of the motor can be further reduced.

[0046] In some embodiments, as Figure 3 and Figure 4As shown, the power terminal 22 is connected to the main body portion 23 on the radially outer side of the main body portion 23, and the power terminal 22 and the main body portion 23 are integrally formed. Thus, the assembly of the motor rotor and stator can be facilitated, and the interference between the rotor and stator during assembly can be avoided.

[0047] In some embodiments, as Figure 3 and Figure 4 shown, the metal bus bar 21 further has a connecting portion 24 located on the radially outer side of the main body portion 23; and a coil clamping portion 25 that extends from the main body portion 23 toward the radially outer side and includes an arm portion 26 and a claw portion 27 provided at the radially outer end of the arm portion 26. The power terminal 22 is disposed on the connecting portion 24 and extends axially. The connecting portion 24 and the claw portion 27 are axially offset, that is, they are not axially opposed, that is, when viewed axially, the projections of the connecting portion 24 and the claw portion 27 do not overlap. Thus, the connection operation between the power terminal 22 and other parts of the bus bar assembly can be facilitated.

[0048] Figure 5 is a schematic diagram of the bottom of the housing of the inner rotor motor according to an embodiment of the present application.

[0049] In the embodiment of the present application, as Figure 2 and Figure 5 shown, the motor according to the embodiment of the present application further includes a stator 50 located inside the housing 10, and the stator 50 and the rotor 30 are disposed opposite to each other radially.

[0050] In some embodiments, as Figure 5 shown, the bottom of the housing 12 has a housing through hole 41 provided around the central axis of the rotation axis, and at least one power terminal 22 ( Figure 5 is the power terminal 22-1 in

[0051]

[0052] Figure 2 In some embodiments, as shown, the motor further includes an induction magnetic ring 43 located above the rotation axis 31, and the induction magnetic ring 43 is located on the axial upper side of the housing through hole 41. Thus, since the bottom of the housing 12 can cover most of the stator 50, the bottom of the housing 12 still has a good magnetic shielding effect.

[0053] In some embodiments, as Figure 1 and Figure 2As shown, a cover portion 60 is disposed outside the bottom 12 of the housing. The cover portion 60 abuts against the bottom 12 of the housing and is sleeved on the outer periphery of the housing 10. The cover portion 60 has a cover portion through hole 61, and the power terminal 22 passes through the cover portion through hole 61.

[0054] In the above embodiment, the cover portion needs to be positioned with respect to the outer periphery of the housing. On the basis of the housing through hole provided at the bottom of the housing, a cover portion through hole that enables the power terminal to pass through is provided, which can improve the degree of freedom of design.

[0055] Figure 6 It is a schematic diagram of the rotor of the inner rotor motor according to an embodiment of the present application.

[0056] In some embodiments, as Figure 2 , Figure 5 and Figure 6 shown, the motor further has a bearing 44 disposed around the rotation axis 31. Among them, the radial distance between at least one power terminal 22 and the bearing 44 is below a certain distance, that is, the at least one power terminal 22 is disposed adjacent to the bearing 44. Thus, while reducing the radial dimension of the output side of the motor, it is convenient for the molding of the bottom of the housing.

[0057] It should be noted that only the structure of the motor related to the present application is described above. The motor may further include other components. For details, reference may be made to the related art, and the description is omitted here.

[0058] As can be seen from the above embodiment, by disposing at least one power terminal closer to the bearing located at the center of the motor than in the conventional structure, when the bus bar assembly is pressed toward the bottom of the motor during assembly, the power terminal protrudes from the bottom of the housing, and the rotor is inserted into the stator from the opening of the housing. Thus, the radial dimension of the motor output can be reduced, and the motor assembly is also facilitated.

[0059] Embodiments of the second aspect

[0060] The embodiments of the present application provide an assembly method for an inner rotor motor. Regarding the structure of the inner rotor motor, it has been described in the embodiments of the first aspect, and the same content as that in the embodiments of the first aspect will not be repeated here.

[0061] Figure 7 It is a schematic diagram of the assembly method of the inner rotor motor according to an embodiment of the present application. As Figure 7 shown, the method includes:

[0062] 710: Dispose the stator carrying the bus bar unit in the housing, with the side carrying the bus bar unit facing the bottom of the housing, and expose the power terminal at the bottom of the housing;

[0063] 720: Insert the rotor into the stator from the opening of the housing, and make at least a part of at least one power terminal axially opposed to the rotor.

[0064] It should be noted that the above description only schematically illustrates the embodiments of the present application, but the present application is not limited thereto. For example, the execution order between various operations can be appropriately adjusted. In addition, some other operations can be added or some of the operations can be reduced. Those skilled in the art can make appropriate modifications according to the above content, not limited to the above description.

[0065] Figure 8 is a schematic diagram of the assembly process of the assembly method of the inner rotor motor according to the embodiment of the present application. As Figure 8 shown, the assembly process includes:

[0066] S1: Mount the bus bar unit 20 on the stator 50, as Figure 8 shown in (a) and (b) of

[0067] S2: Place the stator 50 with the bus bar unit 20 mounted thereon into the housing 10 from one side of the opening 11 of the housing 10. Among them, the side with the bus bar unit 20 mounted thereon faces the bottom 12 of the housing, as Figure 8 shown in (c) of

[0068] and expose the power terminal to the bottom 12 of the housing and also to the cover part 60 at the same time; Figure 8 S3: Insert the rotor 30 into the stator 50 from one side of the opening 11 of the housing 10, as

[0069] shown in (d), (e) and (f) of

[0070] In the above embodiment, by making at least one power terminal closer to the bearing located at the center of the motor than in the conventional structure, when assembling, the bus bar assembly is pressed into the bottom of the motor, the power terminal is exposed from the bottom of the housing, and the rotor is inserted into the stator from the opening of the housing. Thus, the radial dimension of the motor output is reduced and the motor assembly is also facilitated.

[0071] 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 embodiments, and also includes all changes, modifications and equivalents that do not deviate from the scope of the main idea of the present application.

Claims

1. An inner rotor motor, the motor comprises: a housing, the housing comprising an opening and a bottom; a bus bar unit, the bus bar unit comprising a metal bus bar, the metal bus bar comprising a power terminal; and a rotor, the rotor being located inside the housing and arranged around a rotation axis, characterized in that the bus bar unit is located between the bottom of the housing and the rotor, at least a part of at least one of the power terminals is axially opposed to the rotor.

2. The motor according to claim 1, characterized in that the metal bus bar further comprises an annular main body portion electrically connected to the power terminal, and the inner diameter of the main body portion is smaller than the outer diameter of the rotor.

3. The motor according to claim 2, characterized in that at least a part of at least one of the power terminals is closer to the radially inner side than the main body portion.

4. The motor according to claim 3, characterized in that the power terminal is connected to the main body portion on the radially outer side of the main body portion, and the power terminal is integrally formed with the main body portion.

5. The motor according to claim 4, characterized in that the metal bus bar further comprises: a connecting portion located on the radially outer side of the main body portion; and a coil clamping portion extending from the main body portion toward the radially outer side, comprising an arm portion and a claw portion provided at the radially outer end of the arm portion; the power terminal is disposed in the connecting portion, and the connecting portion and the claw portion are axially offset.

6. The motor according to claim 1, characterized in that the bottom of the housing has a housing through hole provided around the central axis of the rotation axis, and at least one of the power terminals passes through the housing through hole; the motor further comprises a stator located inside the housing, the stator being disposed opposite to the rotor in the radial direction; the radial position where the edge of the housing through hole is located is closer to the radially inner side than the radially central position of the stator.

7. The motor according to claim 6, characterized in that the motor further comprises an induction magnetic ring, the induction magnetic ring being located above the rotation axis and axially above the housing through hole.

8. The motor according to claim 6, characterized in that a cover portion is disposed outside the bottom of the housing, the cover portion abutting against the bottom of the housing and sleeving on the outer periphery of the housing, the cover portion having a cover portion through hole, and the power terminal and the cover portion through hole are axially opposed and pass through the cover portion through hole.

9. The motor according to claim 6, characterized in that the motor further comprises a bearing arranged around the rotation axis; the radial distance between at least one of the power terminals and the bearing is below a certain distance.

10. An assembling method of an inner rotor motor, the inner rotor motor having the structure as described in claim 1, characterized in that the assembling method comprises: placing the stator carrying the bus bar unit in the housing, with the side carrying the bus bar unit facing the bottom of the housing, and exposing the power terminal at the bottom of the housing; Insert the rotor into the stator through the opening of the housing, and axially oppose at least a part of at least one of the power terminals to the rotor.

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