motor

Abstract

This application provides an electric motor, comprising: a motor body having a rotor and a stator, the rotor rotating about a central axis, and the stator radially opposite the rotor; a circuit board electrically connected to the motor body and extending along a plane surrounding the central axis; a plurality of capacitors fixed to one side of the circuit board; a connector disposed near the plurality of capacitors; and a base portion supporting the circuit board, the base portion including a flat plate portion opposite to the circuit board and at least one protrusion protruding from the flat plate portion toward the circuit board side, wherein at least one of the protrusions is provided near the connector within the area opposite the circuit board and the flat plate portion. Through this application embodiment, the number of capacitors can be increased while ensuring the stable fixation of the circuit board without increasing the circuit board area.

Description

Technical Field

[0001] This application relates to the field of electromechanical technology, and more particularly to an electric motor. Background Technology

[0002] Motor equipment typically includes a base plate, which is used to mount various electronic components. These electronic components can be mounted on one or both sides of the base plate. These electronic components include, but are not limited to, connectors and capacitors. Connectors are used to physically connect the motor to external circuits, equipment, or power sources to prevent poor contact or wire detachment caused by vibration, displacement, etc.

[0003] In some structures, for a substrate with electronic components on both sides, the overall strength of the motor is ensured by fitting a sleeve into the center of the substrate. The sleeve is located at the center of the motor to support the central shaft and bearings of the motor.

[0004] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application. Utility Model Content

[0005] As customers demand, for example, high static pressure, the motor rotation speed increases and the current increases. In this case, at least two capacitors need to be placed next to the capacitor on the circuit board so that the current flowing into the motor passes through the capacitor first.

[0006] However, in existing structures, to ensure the connection strength of the connector relative to other motor components and to ensure smooth plug insertion and removal, flanged fitting structures are typically provided at both ends of the connector to fix the substrate. In such a structure, if additional capacitors are placed around the connector, the capacitor positions may interfere with the existing fitting structures, making it difficult to place the additional capacitors. In addition, the current market demand for miniaturization makes it difficult to increase the area of ​​the existing substrate to accommodate the placement of additional capacitors. Therefore, it is difficult to simultaneously accommodate the placement of additional capacitors and implement a fitting process that ensures the strength of the connector on the substrate.

[0007] To address at least one of the aforementioned problems or other similar issues, embodiments of this application provide a motor that improves the high static voltage performance of the motor by adding capacitors without increasing the substrate area, while ensuring that connectors near the capacitors do not detach, thereby guaranteeing the stable fixation of the circuit board.

[0008] According to an embodiment of this application, a motor is provided, the motor comprising:

[0009] The motor body has a rotor and a stator, the rotor rotating about a central axis, and the stator being radially opposite to the rotor;

[0010] A circuit board, which is electrically connected to the motor body and extends along a plane surrounding the central axis;

[0011] Multiple capacitors are fixed to one side of the circuit board;

[0012] A connector, which is disposed in the vicinity of the plurality of capacitors; and

[0013] A base portion that supports the circuit board, the base portion including a flat plate portion opposite to the circuit board and at least one protrusion extending from the flat plate portion toward the circuit board.

[0014] At least one of the protrusions is provided near the connector, within the range opposite to the circuit board and the flat plate.

[0015] In one or more embodiments, the at least one protrusion near the connector is located within the area enclosed by the radially inner side of the connector and the outer periphery of the rotor.

[0016] In one or more embodiments, the base portion includes three protrusions that project from the flat plate portion toward the circuit board side.

[0017] In one or more embodiments, the three protrusions include one protrusion located near the connector and equally spaced along the outer periphery of the rotor; or, the three protrusions include one protrusion located near the connector and two protrusions located on the outer periphery of the circuit board.

[0018] In one or more embodiments, the flat plate portion has a first plane facing the circuit board, and the protrusion includes: a first extension extending from one side of the first plane along an axial direction, a second plane extending radially from the first extension, and a second extension extending from one side of the second plane along an axial direction.

[0019] In one or more embodiments, the surface of the circuit board facing the base portion abuts against the second plane.

[0020] In one or more embodiments, the circuit board has a hole at a position opposite to the protrusion, and the second extension includes a columnar portion passing through the hole in the circuit board and a rolled edge structure at the end of the columnar portion. The radial dimension of the rolled edge structure is greater than the radial dimension of the hole in the circuit board, and the rolled edge structure abuts against the surface of the circuit board away from the base portion.

[0021] In one or more embodiments, the protrusion is formed by stamping.

[0022] In one or more embodiments, the protrusion disposed on the outer periphery of the circuit board includes a wall portion extending axially from the outer peripheral edge of the flat plate portion.

[0023] In one or more embodiments, the capacitor is a polymer solid electrolyte capacitor.

[0024] One beneficial effect of this application embodiment is that at least one protrusion is provided near the connector, within the opposing range of the circuit board and the flat plate. Therefore, by providing at least one protrusion within the opposing range of the circuit board and the flat plate, it is unnecessary to provide a fitting structure on both sides of the connector from the outer periphery of the circuit board, ensuring the placement position of the capacitor on the circuit board. Thus, without increasing the circuit board area, the high static voltage performance of the motor can be improved by adding capacitors, while simultaneously ensuring that the connector near the capacitor will not detach, guaranteeing the stable fixation of the circuit board.

[0025] Specific embodiments of this application are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of this application can be adopted. It should be understood that the embodiments of this application are not limited in scope. Within the spirit and scope of the appended claims, embodiments of this application include many changes, modifications, and equivalents.

[0026] Features described and / or illustrated for 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. Attached Figure Description

[0027] The elements and features described in one drawing or embodiment of this application may be combined with elements and features shown in one or more other drawings or embodiments. Furthermore, in the drawings, similar reference numerals denote corresponding parts in several drawings and can be used to indicate corresponding parts used in more than one embodiment.

[0028] The accompanying drawings, which form part of the specification, are used to provide a further understanding of the embodiments of this application and illustrate the implementation methods of this application, together with the textual description, to explain the principles of this application. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0029] Figure 1 This is a schematic diagram of a cross-sectional view of the motor according to an embodiment of this application;

[0030] Figure 2 This is another schematic diagram of the motor according to an embodiment of this application;

[0031] Figure 3 yes Figure 1 An enlarged schematic diagram of part A of the motor shown;

[0032] Figure 4 Another schematic diagram of the motor according to an embodiment of this application is shown;

[0033] Figure 5 It is a three-dimensional schematic diagram of the motor shown in Figure 4;

[0034] Figure 6 yes Figure 4 A side view of the motor shown;

[0035] Figure 7 This is yet another schematic diagram of a motor according to an embodiment of this application;

[0036] Figure 8 This is yet another schematic diagram of a motor according to an embodiment of this application;

[0037] Figure 9 yes Figure 8 A schematic diagram of the circuit board shown. Detailed Implementation

[0038] Referring to the accompanying drawings, the foregoing and other features of the embodiments of this application will become apparent from the following description. Specific implementations of the embodiments of this application are specifically disclosed in the following description and drawings, illustrating some implementations in which the principles of the embodiments of this application can be adopted. It should be understood that the embodiments of this application are not limited to the described implementations; rather, the embodiments of this application include all modifications, variations, and equivalents falling within the scope of the appended claims.

[0039] In embodiments of this application, the term "and / or" includes any one and all combinations of one or more of the terms listed in association. The terms "comprising," "including," "having," etc., refer to 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.

[0040] In the embodiments of this application, the singular forms "a," "the," etc., may include the plural forms and should be broadly interpreted as "a kind" or "a class" rather than limited to the meaning of "an." Furthermore, the term "the" should be understood to include both the singular and plural forms unless the context explicitly indicates otherwise. Additionally, the term "according to" should be understood as "at least partially based on…," and the term "based on" should be understood as "at least partially based on…," unless the context explicitly indicates otherwise.

[0041] In the embodiments of this application, for ease of explanation, the central axis OO' of the motor or the direction parallel to it is referred to as "axial direction", the radial direction centered on the axis is referred to as "radial direction", and the direction around the axis is referred to as "circumferential direction". However, this is only for the convenience of explanation and does not limit the orientation of the motor during use and manufacturing.

[0042] Various embodiments of the present application will now be described with reference to the accompanying drawings. These embodiments are merely exemplary and are not intended to limit the scope of the present application.

[0043] This application provides an embodiment of a motor. Figure 1 This is a schematic diagram of a axial cross-section of the motor according to an embodiment of this application. Figure 2 This is another schematic diagram of the motor according to an embodiment of this application, showing the motor viewed from the axial side.

[0044] like Figure 1 and Figure 2 As shown, the motor 1 includes a motor body 2, a circuit board 3, multiple capacitors 4, a connector 5, and a base 6.

[0045] like Figure 1 As shown, the motor body 2 has a rotor 21 and a stator 22. The rotor 21 rotates around the central axis OO', and the stator 22 is radially opposite to the rotor 21. The circuit board 3 is electrically connected to the motor body 2 and extends along the plane surrounding the central axis OO', as shown. Figure 2 As shown, multiple capacitors 4 are fixed on one side (axial O side) of the circuit board 3, and connector 5 is disposed near the multiple capacitors 4.

[0046] like Figure 1 As shown, the base 6 supports the circuit board 3, as... Figure 1 and Figure 2 As shown, the base portion 6 includes a flat plate portion 61 opposite to the circuit board 3 and at least one protrusion 62 protruding from the flat plate portion 61 toward the circuit board 3, as shown. Figure 1 and Figure 2 As shown, at least one protrusion 62a is provided near the connector 5, within the range opposite to the circuit board 3 and the flat plate portion 61.

[0047] As can be seen from the above embodiments, at least one protrusion 62a is provided near the connector 5, within the area opposite to the circuit board 3 and the flat plate portion 61. Therefore, by providing at least one protrusion within the area opposite to the circuit board and the flat plate portion, it is unnecessary to provide a fitting structure on both sides of the connector from the outer periphery of the circuit board. This ensures the placement position of the capacitor on the circuit board. Thus, without increasing the circuit board area, the high static voltage performance of the motor can be improved by adding capacitors, while simultaneously ensuring that the connector near the capacitor will not detach, guaranteeing the stable fixation of the circuit board.

[0048] For example, in the existing structure of a motor, protruding columnar portions are provided on the outer periphery of the circuit board from both ends of the connector to engage with the notches on the outer periphery of the circuit board to fix the circuit board. Such a fixing structure results in a small area of ​​the circuit board at both ends of the connector. Furthermore, due to the size of the capacitor and the radial dimension of the circuit board located outside the rotor of the motor body, multiple capacitors on the circuit board need to be arranged circumferentially. In such a case, in the existing structure of a motor, at most one capacitor can be provided at the end of the connector.

[0049] In this embodiment, the protrusion 62a is not located on the outer periphery of the circuit board to fix the circuit board from both ends of the connector. This ensures the area of ​​the circuit board 3 at both ends of the connector is equal. Figure 2 As shown, a capacitor 4a can be placed at the end adjacent to connector 5. In this case, a second capacitor 4b can be placed circumferentially close to capacitor 4a, ensuring that the distance between capacitor 4b and connector 5 meets the requirements. In existing motor structures, the distance between the capacitor at the connector end and the connector is greater than that between the capacitor and connector 5. Figure 2 The distance between capacitor 4a and connector 5 is large, and it is impossible to install more capacitors if the distance between the capacitor and connector needs to meet the requirements. Therefore, according to the embodiment of this application, the number of capacitors can be increased to improve the high static voltage performance of the motor without increasing the circuit board area, while ensuring that the connector near the capacitor will not fall off, thus ensuring the stable fixation of the circuit board.

[0050] In the embodiments of this application, at least one protrusion is disposed near the connector, such as around the connector or overlapping with the connector's location. That is, one or more protrusions can be disposed near the connector. This ensures the connector is securely fixed for smooth insertion and removal operations. For example, Figure 2 The illustration shows a protrusion 62a near the connector, but this application is not limited to this. Other protrusions besides protrusion 62a can also be provided near the connector 5, depending on actual needs. The following description uses a single protrusion 62a near the connector as an example.

[0051] In this embodiment, the specific location of the protrusion 62a located near the connector 5 is not limited; for example, ... Figure 2As shown, in one or more embodiments, at least one protrusion 62a near the connector 5 is located within the area enclosed by the radial inner side of the connector 5 and the outer periphery of the rotor 21. That is, the protrusion 62a is located radially inside the connector 5, thereby ensuring the placement position of the capacitor 4 at the end of the connector 5 on the circuit board 3.

[0052] For example, such as Figure 2 As shown, the protrusion 62a is located radially inward at approximately the central third of the connector 5. In other words, the protrusion 62a is located within the area enclosed by the central third of the connector and the outer periphery of the rotor 21. This ensures the connector is securely fixed for smooth insertion and removal operations. However, this application is not limited to this; the protrusion 62a may be located at other radially inward positions on the connector 5.

[0053] Furthermore, this application is not limited to this; the protrusion 62a can also be disposed at other locations near the connector 5, as long as it ensures that the position of the capacitor 4 is disposed on the end side of the connector 5 on the circuit board 3. For example, the protrusion 62a can be located at the end of the connector or radially outward. For example, the position of the protrusion 62a on the circuit board 3 partially overlaps with the position of the connector 5, for example, partially overlapping with the connector 5 at both circumferential ends, or partially overlapping with the connector 5 radially inward or outward. Figure 1 As shown, the circuit board 3 may have a thickened portion 3a on one side of the connector 5. The connector 5 is disposed on the thickened portion 3a, and the protrusion 62a can be inserted into the thickened portion 3a and fixed by, for example, insertion and engagement. In this way, the position of the protrusion 62a on the circuit board 3 may partially overlap with the position of the connector 5. In addition, the protrusion 62a may also be completely located within the range of the position of the connector 5 on the circuit board 3. For example, the protrusion 62a may be located at the center of the connector 5. This application does not limit this and can be selected according to actual needs.

[0054] The specific location of the protrusion 62a located near the connector 5 has been described above by way of example. Next, the shape of the protrusion 62a will be described by way of example.

[0055] Figure 3 yes Figure 1 An enlarged schematic diagram of part A of the motor shown.

[0056] like Figure 1 and Figure 3As shown, the flat plate portion 61 has a first plane 61S facing the circuit board 3. The protrusion 62a includes a first extension 63, a second plane 63S, and a second extension 64. The first extension 63 extends from the first plane 61S along one axial side (O side), the second plane 63S extends radially from the first extension 63, and the second extension 64 extends from the second plane 63S along one axial side (O side). In this way, the protrusion 62a ensures a secure fixation between the circuit board and the base portion at the connector.

[0057] like Figure 3 As shown, in one or more embodiments, the surface 3S of the circuit board 3 facing the base portion 6 abuts against the second plane 63S. Thus, the base portion 6 is able to support the circuit board 3.

[0058] like Figure 3 As shown, in one or more embodiments, the circuit board 3 has a hole 31 opposite to the protrusion 62a. The second extension 64 includes a columnar portion 66 penetrating the hole 31 of the circuit board 3 and a rolled edge structure 67 located at the end of the columnar portion 66. The radial dimension of the rolled edge structure 67 is larger than the radial dimension of the hole 31 of the circuit board 3. The rolled edge structure 67 abuts against the surface 3U of the circuit board 3 away from the base portion. Thus, by forming the hole 31 on the circuit board 3, so that the second edge of the protrusion 62a has the columnar portion 66 and the rolled edge structure 67, a reliable connection between the base portion 6 and the circuit board 3 can be ensured. Furthermore, by placing the protrusion 62a with this structure near the connector, it is possible to ensure smooth plug insertion and removal operations on the connector without affecting the connection between the base portion 6 and the circuit board 3, thus ensuring the overall strength of the motor.

[0059] In this embodiment, the protrusion 62a is formed by stamping. That is, the protrusion 62a can be formed by stamping. The base portion is formed by stamping two layers of stepped material, and the upper (O side) stepped material plane provides support. The columnar portion 66 fixes the circuit board by a flanging fitting process. For stamping, refer to related technologies. For example, after forming the hole 31 on the circuit board 3, the base portion is stamped into a two-layer stepped shape. Then, the columnar portion 66 of the base portion can be pressed into the hole 31 from the axial O' side of the circuit board. The part protruding from the hole 31 is formed into a rolled edge structure 67 by a rolling edge process.

[0060] The above description exemplarily illustrates the specific location and shape of the protrusion 62a located near the connector. In this embodiment, in addition to the protrusion near the connector, the base portion also includes other protrusions protruding towards the circuit board side. This enables the circuit board to be securely fixed relative to the motor. The shapes of the other protrusions may be the same as or different from the shape and forming method of the protrusion 62a located near the connector, and this application does not impose any limitations on this. The following is an exemplary description.

[0061] In one or more embodiments, the base portion includes three protrusions 6 projecting from the flat plate portion toward the circuit board side. This enables a stable fixation of the entire circuit board relative to the motor. However, this application is not limited to this; the number of protrusions 6 can also be other values, such as two or more than three. This application does not limit this, and the following is an exemplary description.

[0062] like Figure 2 As shown, in one or more embodiments, the base portion 6 includes three protrusions 62, which are equally spaced along the outer periphery of the rotor 21. Each protrusion 62 includes a protrusion 62a located near the connector 5. This arrangement of the three protrusions 62 at equal intervals along the outer periphery of the rotor 21 enables a secure fixation between the base portion and the circuit board. In this case, all protrusions 62 can adopt the same structure and molding method as the protrusion 62a located near the connector 5 described above.

[0063] Furthermore, in existing structures, copper foil is often placed at the connection between the circuit board and the sleeve to achieve grounding conductivity. However, on the one hand, when the sleeve is fitted together, the inner diameter tolerance of the substrate increases due to the copper foil, posing a risk of insufficient fixing strength. On the other hand, the inner radial dimension of the sleeve is large, requiring more copper foil material and increasing cost. In this embodiment, the three protrusions 62 are equally spaced on the outer periphery of the rotor 21. This eliminates the need for the fitting structure at the center of the substrate, eliminating the need for fitting at the sleeve position. The sleeve diameter can be reduced, lowering the sleeve processing and material costs. The copper foil for grounding conductivity can be placed at the protrusions 62 with smaller radial dimensions, such as the protrusion 62a near the connector 5, reducing copper foil material usage and further reducing costs. In addition, in existing structures, the fitting structure at the center of the substrate and the connector requires separate flanging fitting processes, i.e., two fitting processes. In this embodiment, the flanging fitting of the three protrusions 62 can be achieved in a single fitting process, saving steps.

[0064] However, this application is not limited to this. Figure 4 Another schematic diagram of the motor shown in this application embodiment is shown. Figure 5 It is a three-dimensional schematic diagram of the motor shown in Figure 4, and Figure 6 is... Figure 4 A side view of the motor shown, as follows Figures 4 to 6 As shown, the three protrusions 62 include one protrusion 62a located near the connector 5 and two protrusions 62b located on the outer periphery of the circuit board 3. The protrusions 62b are located away from the connector. For example, the included angle between the lines connecting any two adjacent protrusions 62 and the center of the motor is the same. In this way, a stable fixation between the base and the circuit board can also be achieved.

[0065] exist Figures 4 to 6 In the illustrated embodiment, the shapes of protrusions 62b and 62a are not exactly the same, for example, as Figure 5 and Figure 6 As shown, in one or more embodiments, the protrusion 62b provided on the outer periphery of the circuit board 3 includes a wall portion 68 extending axially from the outer peripheral edge of the flat plate portion 61, thereby enabling the circuit board 3 to be securely fixed.

[0066] The above description exemplifies an implementation with three protrusions 62, but this application is not limited thereto. For example, the number of protrusions 62 may also be two. Figure 7 This is yet another schematic diagram of a motor according to an embodiment of this application.

[0067] like Figure 7 As shown, a protrusion 62a can be provided near the connector 5. In addition, a fitting structure can also be formed at the center of the sleeve. Thus, by combining the center fitting with a protrusion 62a near the connector 5, a total of two protrusions are formed, which can achieve a stable fixation of the base and the circuit board. For the specific structure of the center fitting between the sleeve and the motor, please refer to the relevant technology, which will not be described in detail here.

[0068] In this embodiment of the application, the hole 31 of the circuit board 3 can be a long cavity structure. Figure 8 This is yet another schematic diagram of a motor according to an embodiment of this application. Figure 9 yes Figure 8 A schematic diagram of the circuit board shown.

[0069] like Figure 8 and Figure 9 As shown, at least one hole 31 is an elongated cavity, for example, the hole 31 near connector 5 is an elongated cavity, while the other two holes 31a are standard circular holes. This balances ease of assembly with post-assembly stability. However, an elongated cavity is not a necessary structure; for example, all three holes 31 can be standard circular holes, or... Figure 7 In such a structure with only two protrusions, both holes of the circuit board 3 can be standard circular holes. This application does not limit this and can set them according to actual needs.

[0070] Furthermore, the above description provides illustrative examples of implementations with two or three protrusions, but this application is not limited thereto. The number of protrusions can also be more than three, for example, including three protrusions spaced apart circumferentially and one centrally fitted protrusion, or more than three protrusions spaced apart circumferentially. This application does not limit this and the choice can be made according to actual needs.

[0071] In one or more embodiments, capacitor 4 is a polymer solid electrolyte capacitor, but this application is not limited thereto, and capacitor 4 may also be other types of capacitors.

[0072] According to an embodiment of this application, at least one protrusion is provided near the connector, within the area opposite to the circuit board and the flat plate. Thus, with at least one protrusion located within the area opposite to the circuit board and the flat plate, there is no need to provide a fitting structure on both sides of the connector from the outer periphery of the circuit board. This ensures the placement position of the capacitor on the circuit board. Therefore, without increasing the circuit board area, the high static voltage performance of the motor can be improved by adding capacitors, while simultaneously ensuring that the connector near the capacitor will not detach, guaranteeing the stable fixation of the circuit board.

[0073] It is worth noting that the above Figures 1 to 9 The impeller in this application is only illustrated schematically, but this application is not limited thereto. For details on various structures or components, please refer to related technologies. Furthermore, additional details may be added. Figures 1 to 9 Structures or components not shown, or reduced Figures 1 to 9 One or more structures or components in it. Figures 1 to 9 For any components or elements not specifically specified herein, please refer to relevant technologies; this application does not impose any limitations on them.

[0074] The embodiments of this application have been described above with reference to specific implementation methods. However, those skilled in the art should understand that these descriptions are exemplary and not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make various modifications and variations to the embodiments of this application based on the spirit and principles of the embodiments, and these modifications and variations are also within the scope of the embodiments of this application.

[0075] Preferred embodiments of the present application have been described above with reference to the accompanying drawings. Many features and advantages of these embodiments are apparent from this detailed description, and therefore the appended claims are intended to cover all such features and advantages falling within the true spirit and scope of these embodiments. Furthermore, since many modifications and alterations will readily occur to those skilled in the art, the embodiments of the present application are not intended to be limited to the precise structures and operations illustrated and described, but rather to encompass all suitable modifications and equivalents falling within their scope.

Claims

1. An electric motor, characterized in that, The motor includes: The motor body has a rotor and a stator, the rotor rotating about a central axis, and the stator being radially opposite to the rotor; A circuit board, which is electrically connected to the motor body and extends along a plane surrounding the central axis; Multiple capacitors are fixed to one side of the circuit board; A connector, which is disposed in the vicinity of the plurality of capacitors; and A base portion that supports the circuit board, the base portion including a flat plate portion opposite to the circuit board and at least one protrusion extending from the flat plate portion toward the circuit board. At least one of the protrusions is provided near the connector, within the range opposite to the circuit board and the flat plate.

2. The motor according to claim 1, characterized in that, The at least one protrusion near the connector is located within the area enclosed by the radially inner side of the connector and the outer periphery of the rotor.

3. The motor according to claim 1, characterized in that, The base portion includes three protrusions that project from the flat plate portion toward the circuit board side.

4. The motor according to claim 3, characterized in that, The three protrusions include one protrusion located near the connector and equally spaced along the outer periphery of the rotor, or... The three protrusions include one protrusion located near the connector and two protrusions located on the outer periphery of the circuit board.

5. The motor according to claim 1, characterized in that, The flat plate portion has a first plane facing the circuit board. The protrusion includes: a first extension extending from one side of the first plane along an axial direction, a second plane extending radially from the first extension, and a second extension extending from one side of the second plane along an axial direction.

6. The motor according to claim 5, characterized in that, The surface of the circuit board facing the base portion abuts against the second plane.

7. The motor according to claim 5, characterized in that, The circuit board has a hole at a position opposite to the protrusion. The second extension includes a columnar portion that passes through the hole in the circuit board and a rolled edge structure at the end of the columnar portion. The radial dimension of the rolled edge structure is larger than the radial dimension of the hole in the circuit board. The rolled edge structure abuts against the surface of the circuit board away from the base portion.

8. The motor according to claim 1, characterized in that, The protrusion is formed by stamping.

9. The motor according to claim 4, characterized in that, The protrusion disposed on the outer periphery of the circuit board includes a wall portion extending axially from the outer peripheral edge of the flat plate portion.

10. The motor according to claim 1, characterized in that, The capacitor is a polymer solid electrolyte capacitor.

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