Motor driving assembly and electrical product

Abstract

The invention provides a motor driving assembly and an electrical product. The motor driving assembly includes: a shaft that rotates about a central axis; a bearing that supports the shaft; a bush that holds the bearing on the inner peripheral side; a stator fixed to the outer peripheral surface of the bush; a rotor facing the stator in the radial direction; the circuit board is electrically connected with the stator; the bracket is connected with the bushing and comprises an accommodating part; and a sealing member which is provided in the accommodating portion and seals the holder and the shaft in the circumferential direction.

Description

Technical Field

[0001] The present application relates to the field of electromechanics, and in particular to a motor drive assembly and an electrical product. Background Art

[0002] In the motor drive assembly, a housing of the motor drive assembly supports a rotor, a stator and a circuit board, and the housing has an axially extending portion that continuously surrounds the stator and the circuit board in a circumferential direction, thereby providing circumferential protection for the stator and the circuit board.

[0003] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present application and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present application. Summary of the invention

[0004] The inventor of the present application discovered that the existing motor drive assembly has a large number of parts, which results in complicated assembly.

[0005] In order to solve at least one of the above problems or other similar problems, the embodiments of the present application provide a motor drive assembly and an electrical product, which can reduce the parts of the motor drive assembly, simplify assembly, and reduce costs.

[0006] According to one aspect of an embodiment of the present application, a motor drive assembly is provided, comprising: a shaft, which rotates around a central axis; a bearing, which supports the shaft; a bushing, which holds the bearing on the inner circumference; a stator, which is fixed to the outer circumference of the bushing; a rotor, which is radially opposite to the stator; a circuit board, which is electrically connected to the stator; a bracket, which is connected to the bushing and includes a housing; and a sealing component, which is arranged in the housing and seals the bracket and the shaft along the circumferential direction.

[0007] According to another aspect of an embodiment of the present application, a motor drive assembly is provided, comprising: a shaft, which rotates around a central axis; a bearing, which supports the shaft; a bushing, which holds the bearing on the inner circumference; a stator, which is fixed to the outer circumference of the bushing; a rotor, which is radially opposite to the stator; a circuit board, which is electrically connected to the stator; and a bracket, which comprises: a main body, which is located on one axial side of the bushing and is connected to the bushing; an extension portion, which extends radially outward from the main body, and the number of the extension portions is more than 2; and a mounting portion, which is connected to the radially outer end of each of the extension portions.

[0008] According to another aspect of the embodiments of the present application, an electrical product is provided, the electrical product comprising the motor drive assembly described in any aspect of the above embodiments.

[0009] One of the beneficial effects of the embodiments of the present application is that in a motor drive assembly, a housing portion is formed in the bracket, a sealing component is disposed in the housing portion, and the bracket and the shaft are sealed along the circumferential direction, thereby eliminating the need to provide other components outside the bracket for accommodating the sealing component; alternatively, by connecting a mounting portion to the end of an extension portion of the bracket extending radially outward from the main body portion, the structure of the bracket can be simplified; thereby, the number of components of the motor drive assembly can be reduced, assembly can be simplified, and costs can be reduced.

[0010] With reference to the following description and accompanying drawings, the specific embodiments of the present application are disclosed in detail, indicating the way in which the principles of the present application can be adopted. It should be understood that the embodiments of the present application are not limited in scope. Within the scope of the terms of the appended claims, the embodiments of the present application include many changes, modifications and equivalents.

[0011] Features described and / or illustrated with respect to one embodiment may 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.

[0012] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The elements and features described in one figure or one implementation of the present application embodiment may be combined with the elements and features shown in one or more other figures or implementations. In addition, in the accompanying drawings, similar reference numerals represent corresponding parts in several figures and can be used to indicate corresponding parts used in more than one implementation.

[0014] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0015] Figure 1 is a schematic diagram of the structure of the motor drive assembly;

[0016] Figure 2 The motor drive assembly Figure 1 A cross-sectional view taken along a section line A-A';

[0017] Figure 3is another schematic diagram of the structure of the motor drive assembly;

[0018] Figure 4 The motor drive assembly Figure 1 Another cross-sectional view taken along the section line AA';

[0019] Figure 5 The motor drive assembly Figure 1 Another cross-sectional view taken along the section line AA';

[0020] Figure 6 is another schematic diagram of the structure of the motor drive assembly;

[0021] Figure 7 The motor drive assembly Figure 6 A cross-sectional view taken along section line BB';

[0022] Figure 8 is a schematic diagram of the motor drive assembly 100 ′;

[0023] Fig. 9 is another schematic diagram of the motor drive assembly 100 ′;

[0024] Fig.10 is another schematic diagram of the motor drive assembly 100 ′;

[0025] Fig.11 is another schematic diagram of the motor drive assembly 100 ′. DETAILED DESCRIPTION

[0026] The foregoing and other features of the present application will become apparent through the following description with reference to the accompanying drawings. In the description and the accompanying 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. On the contrary, the present application includes all modifications, variations and equivalents falling within the scope of the attached claims. Various embodiments of the present application are described below in conjunction with the accompanying drawings. These embodiments are exemplary only and are not limitations of the present application.

[0027] In the embodiments of the present application, the terms "first", "second", "upper", "lower", etc. are used to distinguish different elements in terms of title, but do not indicate the spatial arrangement or time order of these elements, etc., 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. refer to the presence of the stated features, elements, components or components, but do not exclude the presence or addition of one or more other features, elements, components or components.

[0028] In the embodiments of the present application, the singular forms "a", "the", etc. include plural forms and should be broadly understood as "a kind" or "a type" 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 in part according to...", and the term "based on" should be understood as "at least in part based on...", unless the context clearly indicates otherwise.

[0029] In addition, in the following description of the embodiments of the present application, for the convenience of explanation, the radial direction centered on the central axis of the shaft of the motor drive assembly is called "radial"; the direction around the central axis is called "circumferential"; the direction along the central axis or parallel to it is called "axial" or "up and down direction", and in the axial direction, the direction from the circuit board to the rotor is the "up" direction or the other axial side, and the direction opposite to the "up" direction is the "down" direction or one axial side; the side away from the central axis along the radial direction is called the "radial outer side", and the side close to the central axis along the radial direction is called the "radial inner side".

[0030] It should be noted that the above directions of the present application are only for the convenience of explaining the present application, and do not indicate the directions of the motor drive components and electrical products of the present application in manufacturing and use.

[0031] Embodiments of the first aspect

[0032] An embodiment of a first aspect of the present application provides a motor drive assembly. Figure 1 This is a schematic diagram of the structure of the motor drive assembly. Figure 2 The motor drive assembly Figure 1 A cross-sectional view taken along section line AA'.

[0033] like Figure 1 and Figure 2 As shown, the motor drive assembly 100 includes: a shaft 1, a rotor 2, a stator 3 ( Figure 2 As shown), circuit board 4, bracket 5, bearing 6 ( Figure 2 As shown), sealing component 7 ( Figure 2 As shown) and bushing 8 ( Figure 2 shown).

[0034] like Figure 1 and Figure 2 As shown, the shaft 1 rotates around the central axis OO'; the bearing 6 supports the shaft 1; the bushing 8 holds the bearing 6 on the inner circumference; the stator 3 is fixed to the outer circumference of the bushing 8; the rotor 2 and the stator 3 are radially opposed; the circuit board 4 is electrically connected to the stator; the bracket 5 is connected to the bushing 8, and includes a housing portion 50; the sealing component 7 is arranged in the housing portion 50, and seals the bracket 5 and the shaft 1 along the circumferential direction.

[0035] According to the above embodiment, in the motor drive assembly 100, a housing portion 50 is formed in the bracket 5, and the sealing component 7 can be arranged in the housing portion 50, and there is no need to provide other components for accommodating the sealing component 7 outside the bracket 5, thereby reducing the number of parts of the motor drive assembly 100, simplifying the assembly process, and reducing costs; in addition, the bracket 5 and the shaft 1 are sealed circumferentially by the sealing component 7, which can prevent external dust, water vapor, etc. from entering the interior of the motor drive assembly and affecting the components in the motor drive assembly, thereby ensuring the stability and service life of the motor drive assembly.

[0036] In some embodiments, Figure 1 and Figure 2 As shown, the bracket 5 includes: a first bracket 51 and a second bracket 52. Among them, the first bracket 51 includes: a first main body 511, a first extension portion 512, a second extension portion 513, and a first mounting portion 514. The first main body 511 is located on one axial side of the bushing 8 and is connected to the bushing 8. The first extension portion 512 extends radially outward from the first main body 511, and the number of the first extension portions 512 is more than 2. The second extension portion 513 extends from the radially outer end of each first extension portion 512 to the other axial side. The first mounting portion 514 is connected to the end B on the other axial side of each second extension portion 513, and is located radially outward of the second extension portion 513.

[0037] The second bracket 52 includes a receiving portion 50 and a connecting portion 521. The connecting portion 521 extends radially outward from the receiving portion 50. There are two or more connecting portions 521. The radially outer end of each connecting portion 521 is connected to the other axial end B of each second extending portion 513.

[0038] In some embodiments, Figure 1 and Figure 2 As shown, the number of the first extension parts 512 and the second extension parts 513 can be more than 2, and adjacent first extension parts 512 and adjacent second extension parts 513 are disconnected from each other in the circumferential direction, thereby increasing the heat dissipation channels of the stator and the circuit board, which facilitates the heat dissipation of the stator and the circuit board.

[0039] In some embodiments, Figure 1 and Figure 2 As shown, the first mounting portion 514 is connected to the end B on the other axial side of the second extension portion 513 and is located radially outside the second extension portion 513. The first mounting portion 514 is used to mount a driven component driven by the motor drive assembly 100, that is, the driven component can be fixedly connected to the first mounting portion 514 and driven by the output end D1 of the shaft 1 of the motor drive assembly 100. The driven component can be a component of an electrical device such as an oven.

[0040] like Figure 2 As shown, the first bracket 51 is connected to the bushing 8. By installing the driven component on the first bracket 51 of the motor drive assembly 100, the stability of the connection between the driven component and the motor drive assembly 100 can be improved compared to installing the driven component on the second bracket 52 of the motor drive assembly 100.

[0041] In some embodiments, the first mounting portion 514 can be connected to the driven component in various ways. Figure 2 As shown, the first mounting portion 514 is provided with a through hole C, and by disposing a corresponding component of the driven component in the through hole C, the motor driving assembly 100 is connected to the driven component.

[0042] In some embodiments, the first body portion 511 of the first bracket 51 can be connected to the bushing 8 in various ways. Figure 2 As shown, the first main body 511 can be connected to the bushing 8 through a fixing component D2, and the fixing component D2 can be a screw, etc. The present application is not limited thereto, and the first main body 511 can also be connected to the bushing 8 by means of snap-fitting, welding, interference fit, etc., or the first bracket 51 and the bushing 8 can also be made in an integrally formed manner.

[0043] Figure 3 is another schematic diagram of the structure of the motor drive assembly. Figure 3 As shown, the first main body 511 of the first bracket 51 includes more than two mounting holes E arranged along the circumferential direction. By providing more than two mounting holes E on the first main body 511, the first main body 511 can be connected to the bushing 8 through the fixing component D2 cooperating with the mounting hole E. For example, the fixing component D2 is a screw, and the inner wall of the mounting hole E is provided with a thread matching the screw.

[0044] By providing more than two mounting holes E, the reliability of the connection between the first body portion 511 and the bushing 8 can be ensured. Figure 3 As shown, the number of the mounting holes E may be three, and the three mounting holes E may be arranged at equal intervals along the circumferential direction.

[0045] In some embodiments, Figure 3 As shown, the first extension portion 512 is aligned with the mounting hole E of the first main body portion 511 in the circumferential direction, that is, the first extension portion 512 can be located radially outside the mounting hole E of the first main body portion 511. As a result, the strength near the mounting hole E of the first main body portion 511 can be improved, thereby improving the reliability of the connection between the first bracket 51 and the bushing 8. The present application is not limited to this, and the first extension portion 512 and the mounting hole E of the first main body portion 511 can also be staggered in the circumferential direction.

[0046] In some embodiments, Figure 2 As shown, the first bracket 51 further includes: a first rib 515. The first rib 515 is located radially inside the second extension portion 513, extends in the axial direction and radial direction, and the end of the first rib 515 on one axial side is connected to the first extension portion 512. By providing the first rib 515 at the connection position of the first extension portion 512 and the second extension portion 513, the connection strength of the first extension portion 512 and the second extension portion 513 can be improved, and the motor drive assembly can be applied to a variety of application scenarios.

[0047] In some embodiments, one or more first ribs 515 may be provided. For example, one first rib 515 is provided on both sides of the second extension portion 513 in the circumferential direction.

[0048] In some embodiments, Figure 2 As shown, the first bracket 51 further includes: a second rib 516. The second rib 516 is located radially outside the second extension portion 513, extends in the axial direction and radial direction, and the end of the second rib 516 on the other axial side is connected to the first mounting portion 514. By providing the second rib 516 at the connection position between the second extension portion 513 and the first mounting portion 514, the connection strength between the second extension portion 513 and the first mounting portion 514 can be improved, and the motor drive assembly can be applied to a variety of application scenarios.

[0049] In some embodiments, one or more second ribs 516 may be provided. For example, one second rib 516 is provided on both sides of the second extension portion 513 in the circumferential direction.

[0050] Figure 4 The motor drive assembly Figure 1 Another cross-sectional view of the section line A-A'. In some embodiments, the second bracket 52 includes a receiving portion 50 and a connecting portion 521. The radially outer end F of the connecting portion 521 of the second bracket 52 is connected to the axially other end B of each second extension portion 513. The end F can be connected to the end B in various ways. For example, Figure 4 As shown, the end F and the end B may be provided with screw holes, and the end F and the end B may be fixed by screws G.

[0051] In some embodiments, Figure 4 As shown, the first bracket 51 further includes: a positioning portion 517. The positioning portion 517 is located on both sides of the second extension portion 513 in the circumferential direction, extends from the end B on the other axial side of the second extension portion 513 to the other axial side, and positions the connecting portion 521 of the second bracket 52 in the circumferential direction. As a result, it is convenient to assemble the first bracket 51 and the second bracket 52, and the concentricity of the first bracket 51 and the second bracket 52 can be ensured, which helps to improve the stability of the motor drive assembly 100.

[0052] For example, the end F of the connecting portion 521 of the second bracket 52 is connected to the end B of the second extending portion 513 of the first bracket 51, and the end F abuts against the positioning portion 517 on both sides of the circumference, or the circumferential distance between the end F and the positioning portion 517 is less than a preset value (for example, tolerance, etc.).

[0053] In some embodiments, Figure 4 As shown, after the end F of the connecting portion 521 of the second bracket 52 is connected to the end B of the second extending portion 513 of the first bracket 51, the surface of the second bracket 52 on the other axial side is located closer to the axial side relative to the surface of the first mounting portion 514 on the other axial side. Thus, interference with the driven component mounted on the first mounting portion 514 can be avoided. Alternatively, when the end F and the end B are fixed by the screw G, the end surface of the screw G on the other axial side is located closer to the axial side relative to the surface of the first mounting portion 514 on the other axial side.

[0054] In some embodiments, the above components or some of the above components in the first bracket 51 or the second bracket 52 may be integrally formed. The present application is not limited thereto, and the first bracket 51 or the second bracket 52 may also be made in other ways.

[0055] Figure 5 The motor drive assembly Figure 1 Another cross-sectional view of the section line A-A'. Figure 5 The structure of the receiving portion 50 of the second bracket 52 will be described as an example.

[0056] like Figure 5 As shown, the accommodating portion 50 includes: a side wall portion 501, a first limiting portion 502 and a second limiting portion 503. The side wall portion 501 is located radially outside the shaft 1; the first limiting portion 502 extends radially inward from the end of the other axial side of the side wall portion 501; the second limiting portion 503 extends radially inward from the end of one axial side of the side wall portion 501, wherein the first limiting portion 502 and the second limiting portion 503 limit the sealing component 7 in the axial direction. Thus, the sealing component 7 can be limited in the radial and axial directions by the accommodating portion 50, and other limiting components do not need to be provided, which can further reduce the number of components of the motor drive assembly and simplify the assembly process.

[0057] In some embodiments, the first limiting portion 502 is continuous in the circumferential direction, and the second limiting portion 503 is discontinuous in the circumferential direction. On the one hand, when the driven component is located on the other axial side of the second bracket 52, by setting the first limiting portion 502 to be continuous in the circumferential direction, it is possible to reduce dust, water vapor, etc. on the side of the driven component from entering the accommodating portion 50, and it is possible to more reliably avoid the displacement of the sealing component 7 toward the other axial side, and it is also possible to improve the strength of the second bracket 52; on the other hand, by setting the second limiting portion 503 to be discontinuous in the circumferential direction, it is convenient to demould the second bracket 52 when the second bracket 52 is manufactured by injection molding or the like. The present application is not limited to this, and the first limiting portion 502 and the second limiting portion 503 may also be set in the following form, for example, the first limiting portion 502 is discontinuous in the circumferential direction, and the second limiting portion 503 is continuous in the circumferential direction, or the first limiting portion 502 is discontinuous in the circumferential direction, and the second limiting portion 503 is discontinuous in the circumferential direction, or the first limiting portion 502 is continuous in the circumferential direction, and the second limiting portion 503 is continuous in the circumferential direction.

[0058] In some embodiments, Figure 5 As shown, the inner circumference of the side wall portion 501 is provided with at least one groove H, and the outer circumference of the sealing component 7 is provided with at least one protrusion 71, which is accommodated in the groove H. Thus, the sealing component 7 can be further limited, and the sealing performance of the sealing component 7 is improved.

[0059] like Figure 5 As shown, the groove H may include two grooves located at different positions in the axial direction, and accordingly, the protrusion 71 may include two protrusions respectively aligned with the two grooves in the axial direction. The present application is not limited thereto, and the number of the grooves H and the protrusion 71 may also be other numbers.

[0060] In some embodiments, the groove H and the protrusion 71 are continuous in the circumferential direction. Alternatively, the groove H and the protrusion 71 may also be discontinuous in the circumferential direction.

[0061] In some embodiments, the shaft 1 includes an input end and an output end, wherein the input end may be an end connected to a component such as the rotor 2, and the output end may be an end connected to a driven component.

[0062] In some embodiments, the output end D1 of the shaft 1 may be located at the other axial side of the second bracket 52 . The present application is not limited thereto, and the output end D1 of the shaft 1 may also be located at one axial side of the first bracket 51 .

[0063] In some embodiments, Figure 1As shown, the motor drive assembly 100 further includes: a fan blade 9. The fan blade 9 is driven by the shaft 1 and rotates along the central axis OO'. For example, the fan blade 9 can be connected to the shaft 1, whereby the fan blade 9 can rotate with the shaft 1, thereby preventing external heat from being transferred to the circuit board and the stator, thereby improving the life of the motor drive assembly 100.

[0064] In some embodiments, Figures 1 to 5 As shown, the bracket may include a first bracket and a second bracket, but the present application is not limited thereto, and the bracket 5 may also be other structures. Figure 6 is another schematic diagram of the structure of the motor drive assembly, Figure 7 The motor drive assembly Figure 6 A cross-sectional view of the section line BB'. Figure 6 and Figure 7 As shown, the bracket 5 includes a third bracket 53. The third bracket 53 includes: a second main body 531, a third extension portion 532, a fourth extension portion 533, and a second mounting portion 534. The second main body 531 is located at the bushing 8 ( Figure 7 The axial side of the second main body 531 is connected to the bushing 8, and the inner circumference of the second main body 531 is provided with a receiving portion 50a ( Figure 7 As shown); the third extension portion 532 extends radially outward from the second main body portion 531, and the number of the third extension portions 532 is more than 2; the fourth extension portion 533 extends from the radially outer end portion of each third extension portion 532 to the axial side; the second mounting portion 534 is connected to the axial side end portion of each fourth extension portion 533, and is located radially outside the fourth extension portion 533.

[0065] like Figure 6 and Figure 7 As shown, the bracket 5 only includes a third bracket 53 located on one axial side of the bushing 8. The third bracket 53 is not only connected to the bushing 8, but also has a second mounting portion 534 connected to the driven component, and a housing portion 50a for housing the sealing component 7. This can further reduce the number of components of the motor drive assembly 100 and further simplify the assembly process.

[0066] In some embodiments, the second body portion 531 of the third bracket 53 can be connected to the bushing 8 in various ways. Figure 7 As shown, the second main body 531 of the third bracket 53 includes more than two mounting holes I arranged along the circumferential direction. By providing more than two mounting holes I on the second main body 531, the second main body 531 can be connected to the bushing 8 through the fixing component J that cooperates with the mounting holes I. The specific connection method between the second main body 531 and the bushing 8 can refer to the connection method between the first main body 511 of the first bracket 51 and the bushing 8, and its content is merged here and will not be described in detail.

[0067] In some embodiments, Figure 6 As shown, the number of mounting holes I may be 3, and the 3 mounting holes I may be arranged at equal intervals along the circumferential direction.

[0068] In some embodiments, Figure 6 As shown, the third extension portion 532 is aligned with the mounting hole I of the second main body portion 531 in the circumferential direction. Thus, the strength near the mounting hole I of the second main body portion 531 can be improved, thereby improving the reliability of the connection between the third bracket 53 and the bushing 8. The present application is not limited thereto, and the third extension portion 532 and the mounting hole I of the second main body portion 531 can also be staggered in the circumferential direction.

[0069] In some embodiments, Figure 7 As shown, the third bracket 53 further includes: a third rib 535. The third rib 535 is located radially inside the fourth extension portion 533, extends in the axial direction and radial direction, and the end of the third rib 535 on the other axial side is connected to the third extension portion 532. By providing the third rib 535 at the connection position between the third extension portion 532 and the fourth extension portion 533, the connection strength between the third extension portion 532 and the fourth extension portion 533 can be improved, and the motor drive assembly can be applied to a variety of application scenarios.

[0070] In some embodiments, one or more third ribs 535 may be provided. For example, one third rib 535 is provided on both sides of the fourth extension portion 533 in the circumferential direction.

[0071] In some embodiments, Figure 7 As shown, the third bracket 53 further includes: a fourth rib 536. The fourth rib 536 is located radially outside the fourth extension portion 533, extends in the axial direction and radial direction, and the end of the fourth rib 536 on one axial side is connected to the second mounting portion 534. By providing the fourth rib 536 at the connection position between the fourth extension portion 533 and the second mounting portion 534, the connection strength between the fourth extension portion 533 and the second mounting portion 534 can be improved, and the motor drive assembly can be applied to a variety of application scenarios.

[0072] In some embodiments, one or more fourth ribs 536 may be provided. For example, one fourth rib 536 may be provided on both sides of the fourth extension portion 533 in the circumferential direction.

[0073] In some embodiments, Figure 7As shown, the accommodating portion 50a of the third bracket 53 includes: a side wall portion 501a and a third limiting portion 502a. The side wall portion 501a is located radially outside the shaft 1; the third limiting portion 502a extends radially inside from one axial end of the side wall portion 501a, wherein the third limiting portion 502a and the bearing 6 limit the sealing component 7 in the axial direction. Thus, the sealing component 7 can be limited in the radial and axial directions by the accommodating portion 50a and the bearing 6, and other limiting components do not need to be provided, which can reduce the number of components of the motor drive assembly and simplify the assembly process.

[0074] In some embodiments, the third position limiting portion 502a is continuous in the circumferential direction. When the driven component is located on one side of the third bracket 53 in the axial direction, by setting the third position limiting portion 502a to be continuous in the circumferential direction, it is possible to reduce dust, water vapor, etc. on the side of the driven component from entering the accommodating portion 50a, and it is possible to more reliably avoid the displacement of the sealing component 7 toward one side in the axial direction, and it is possible to improve the strength of the third bracket 53. The present application is not limited to this, and the third position limiting portion 502a is discontinuous in the circumferential direction.

[0075] In some embodiments, the inner circumference of the side wall portion 501a may also be provided with at least one groove, and the protrusion 71 of the outer circumference of the sealing component 7 is accommodated in the groove. Thus, the sealing component 7 can be further limited, and the sealing performance of the sealing component 7 can be improved. The specific form of the groove can refer to the groove H of the side wall portion 501, and will not be described here.

[0076] In some embodiments, Figure 6 and Figure 7 As shown, the output end of the shaft 1 may be located at one axial side of the third bracket 53. The present application is not limited thereto, and the output end of the shaft 1 may also be located at one axial side of the third bracket 53.

[0077] In some embodiments, the above components or some of the above components in the third bracket 53 may be integrally formed. The present application is not limited thereto, and the third bracket 53 may also be made in other ways.

[0078] The embodiment of the present application also provides a motor drive assembly 100'. The difference between the motor drive assembly 100' and the aforementioned motor drive assembly 100 is that the main body 51' of the bracket 5' of the motor drive assembly 100' may not be provided with a accommodating portion, and the motor drive assembly 100' may not include a sealing component. As a result, the number of components of the motor drive assembly 100' can be further reduced, and the assembly process can be further simplified. The other structures of the motor drive assembly 100' can refer to the corresponding structures of the motor drive assembly 100, and their contents are incorporated herein.

[0079] Figure 8 and Fig. 9is a schematic diagram of the motor drive assembly 100'. Figure 8 and Fig. 9 As shown, the motor drive assembly 100' comprises: a shaft 1', a rotor 2', a stator, a circuit board 4', a bracket 5', a bearing and a bushing. The shaft 1' rotates around the central axis; the bearing supports the shaft 1'; the bushing holds the bearing on the inner circumference; the stator is fixed to the outer circumference of the bushing; the rotor 2' and the stator are opposite in the radial direction; and the circuit board 4' is electrically connected to the stator.

[0080] like Figure 8 As shown, the bracket 5' can be composed of a main body 51', an extension 52', and a mounting portion 53'. The main body 51' is located on one axial side of the bushing and connected to the bushing; the extension 52' extends from the main body 51' to the radial outer side and to one axial side, and the number of the extensions 52' is more than 2; and the mounting portion 53' is connected to the radial outer end of each extension 52'.

[0081] Fig.10 and Fig.11 1 are other schematic diagrams of the motor drive assembly 100 ′. Fig.10 and Fig.11 As shown, the motor drive assembly 100' further includes: a fan blade 9'. The fan blade 9' is driven by the shaft 1' and rotates along the central axis.

[0082] In some embodiments, Fig.10 and Fig.11 As shown, the fan blade 9' is arranged on one axial side of the circuit board 4', that is, the fan blade 9' is arranged at a position close to the circuit board 4', thereby facilitating heat dissipation of the circuit board 4'.

[0083] In some embodiments, Figure 1 , Fig.10 and Fig.11 As shown, the fan blades are located on the side closer to the shaft output end relative to the stator, rotor, and circuit board of the motor drive assembly, thereby blocking the heat transferred from the driven component side and increasing the life of the motor drive assembly.

[0084] According to an embodiment of the first aspect of the present application, in a motor drive assembly, a housing portion is formed in the bracket, and a sealing component is disposed in the housing portion, so that the bracket and the shaft are sealed along the circumferential direction. Thus, there is no need to provide other components outside the bracket for accommodating the sealing component; alternatively, by connecting a mounting portion to the end of an extension portion of the bracket extending radially outward from the main body portion, the structure of the bracket can be simplified; thereby, the number of components of the motor drive assembly can be reduced, assembly can be simplified, and costs can be reduced.

[0085] Embodiments of the second aspect

[0086] The second aspect of the present application provides an electrical product having the motor drive assembly described in the first aspect of the present application. The electrical product may be, for example, an oven.

[0087] In the embodiments of the first aspect, the structures of the motor drive assemblies 100 and 100 ′ have been described in detail, and the contents thereof are incorporated herein, and the description thereof is omitted here.

[0088] According to an embodiment of the second aspect of the present application, in the electrical product, a housing portion is formed in the bracket of the motor drive assembly, and a sealing component is arranged in the housing portion, so that the bracket and the shaft are sealed along the circumferential direction. Therefore, there is no need to provide other components outside the bracket for accommodating the sealing component; alternatively, by connecting a mounting portion to the end of an extension portion of the bracket extending radially outward from the main body, the structure of the bracket can be simplified; thereby, the components of the motor drive assembly can be reduced, the assembly can be simplified, and the cost can be reduced, thereby reducing the components of the electrical product, simplifying the assembly, and reducing the cost.

[0089] The present application is described above in conjunction with specific implementation methods, but it should be clear to those skilled in the art that these descriptions are exemplary and are not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on the spirit and principles of the present application, and these modifications and variations are also within the scope of the present application.

Claims

1. A motor drive assembly, characterized in that: The motor drive assembly comprises: A shaft that rotates about a central axis; a bearing that supports the shaft; a bushing that holds the bearing on the inner peripheral side; a stator fixed to the outer peripheral surface of the bushing; a rotor, which is radially opposite to the stator; a circuit board electrically connected to the stator; a bracket connected to the bushing and comprising a receiving portion; and A sealing component is disposed in the accommodating portion and seals the bracket and the shaft along a circumferential direction.

2. The motor drive assembly according to claim 1, characterized in that: The bracket comprises: a first bracket and a second bracket, The first bracket comprises: A first main body portion, which is located on one axial side of the bushing and connected to the bushing; a first extension portion extending radially outward from the first main body portion, wherein the number of the first extension portions is more than two; A second extension portion extending from a radially outer end portion of each of the first extension portions toward the other axial side; A first mounting portion connected to the other axial end of each of the second extending portions and located radially outside the second extending portions; The second bracket comprises: the accommodating portion; A connecting portion extends radially outward from the accommodating portion, the number of the connecting portions is two or more, and a radially outer end portion of each connecting portion is connected to an axially other end portion of each second extending portion.

3. The motor drive assembly according to claim 2, characterized in that: The first main body portion of the first bracket includes more than two mounting holes arranged along the circumferential direction.

4. The motor drive assembly according to claim 2, characterized in that: The output end of the shaft is located at the other axial side of the second bracket; or, the output end of the shaft is located at one axial side of the first bracket.

5. The motor drive assembly according to claim 2, characterized in that: The first bracket also includes: The first rib is located radially inside the second extension portion and extends in the axial direction and the radial direction. An end portion of the first rib on one axial side is connected to the first extension portion.

6. The motor drive assembly according to claim 2, characterized in that: The first bracket also includes: The second rib is located radially outside the second extending portion and extends in the axial direction and the radial direction. The end of the second rib on the other axial side is connected to the first mounting portion.

7. The motor drive assembly according to claim 2, characterized in that: The first bracket also includes: The positioning portion is located on both sides of the second extension portion in the circumferential direction, extends from the end of the second extension portion on the other axial side to the other axial side, and positions the connecting portion of the second bracket in the circumferential direction.

8. The motor drive assembly according to claim 1, characterized in that: The support comprises a third support, The third bracket comprises: A second main body portion, which is located on one axial side of the bushing and connected to the bushing, and the accommodating portion is provided on the inner circumference of the second main body portion; a third extension portion extending radially outward from the second main body portion, wherein the number of the third extension portions is more than two; a fourth extension portion extending from a radially outer end portion of each of the third extension portions toward one side in the axial direction; The second mounting portion is connected to an end portion on one axial side of each of the fourth extending portions and is located radially outside the fourth extending portion.

9. The motor drive assembly according to claim 8, characterized in that: The second main body portion of the third bracket includes more than two mounting holes arranged along the circumferential direction.

10. The motor drive assembly according to claim 8, characterized in that: The output end of the shaft is located on one axial side of the third bracket.

11. The motor drive assembly according to claim 8, characterized in that: The third bracket further comprises: The third rib is located radially inside the fourth extension portion and extends in the axial direction and the radial direction. The end portion on the other axial side of the third rib is connected to the third extension portion.

12. The motor drive assembly according to claim 8, characterized in that: The third bracket further comprises: The fourth rib is located radially outside the fourth extending portion and extends in the axial direction and radial direction. An end portion of the fourth rib on one axial side is connected to the second mounting portion.

13. The motor drive assembly according to claim 1, characterized in that: The receiving portion comprises: a side wall portion located radially outward of the shaft; A first limiting portion extending radially inward from the other axial end of the side wall portion; A second limiting portion extends radially inward from an axial end of the side wall portion. Wherein, the first limiting portion and the second limiting portion limit the sealing component in the axial direction.

14. The motor drive assembly according to claim 13, characterized in that: The first limiting portion is continuous in the circumferential direction, and the second limiting portion is discontinuous in the circumferential direction; or The first limiting portion is discontinuous in the circumferential direction, and the second limiting portion is continuous in the circumferential direction.

15. The motor drive assembly according to claim 13, characterized in that: The inner circumferential surface of the side wall portion is provided with at least one groove, and the outer circumferential surface of the sealing component is provided with at least one protrusion, and the protrusion is accommodated in the groove.

16. The motor drive assembly according to claim 15, characterized in that: The groove and the protrusion are continuous in the circumferential direction; or, The groove and the protrusion are discontinuous in the circumferential direction.

17. The motor drive assembly according to any one of claims 1 to 16, characterized in that: The motor drive assembly also includes: The fan blades are driven by the shaft and rotate around the central axis.

18. A motor drive assembly, characterized in that: The motor drive assembly comprises: A shaft that rotates about a central axis; a bearing that supports the shaft; a bushing that holds the bearing on the inner peripheral side; a stator fixed to the outer peripheral surface of the bushing; a rotor, which is radially opposite to the stator; a circuit board electrically connected to the stator; and A support comprising: A main body, which is located on one axial side of the bushing and connected to the bushing; An extension portion extending from the main body portion radially outward and axially to one side, and the number of the extension portions is more than 2; The mounting portion is connected to the radially outer end of each of the extending portions.

19. The motor drive assembly according to claim 18, characterized in that The motor drive assembly also includes: The fan blades are driven by the shaft and rotate around the central axis.

20. An electrical device, characterized in that: The electrical equipment comprises: A motor drive assembly as claimed in any one of claims 1 to 19.

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