Motors and blowers

Abstract

To provide a technique of appropriately performing sealing with a resin while reducing the thickness of a motor, and preventing an influence of a variation in manufacture.SOLUTION: A motor 1 has a rotation part 10 rotated with a vertically extending central axis C as a center, and a stationary part 20 rotatably supporting the rotation part. The stationary part has a stator 21 that faces against at least one part of the rotation part in a radial direction and has a coil 213, a base 22 arranged below in an axial direction of the stator, a substrate 23 arranged between the stator and the base in the axial direction, a conduction member 24 having an extension part which electrically connects the coil and a substrate and extends downward in the axial direction from the substrate, and a resin part 25 that covers the substrate and the conduction member and connects the base and the stator. On the upper surface in the axial direction of the base, when viewed from the axial direction, an opening 223 superposed on the conduction member is provided.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a motor and a blower device. [Background technology]

[0002] Conventionally, in a motor having a base and a stator attached to the base, a configuration is known in which a circuit board is placed between the base and the stator, and the stator and board are encapsulated with resin placed on the base (see, for example, Patent Document 1).

[0003] In such a motor, in order to electrically connect the coil of the stator to a circuit board arranged below the stator, for example, a conductor wire drawn from the coil is wound around a terminal pin fixed to the stator, and the terminal pin is fixed to the circuit board by soldering. The terminal pin penetrates the circuit board, and the tip of the terminal pin protrudes below the circuit board. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-188091 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the configuration of a conventional motor, for example, when trying to reduce the thickness of the motor, the distance between the base and the terminal pins that penetrate the circuit board arranged between the base and the stator may become smaller. In such a case, it may be difficult for the resin to enter under the terminal pins. Furthermore, when trying to reduce the thickness of the motor, for example, due to variations in assembly or dimensions of parts, the terminal pins may come into contact with the base during manufacturing.

[0006] The present invention aims to provide a technique that can appropriately seal a motor with resin while making the motor thinner. Another aim of the present invention is to provide a technique that can reduce the influence of variations during manufacturing while making the motor thinner. [Means for solving the problem]

[0007] An exemplary motor of the present invention includes a rotating part that rotates around a central axis extending vertically, and a stationary part that rotatably supports the rotating part. The stationary part includes a stator that faces at least a part of the rotating part in the radial direction and has a coil, a base that is arranged axially below the stator, a substrate that is arranged axially between the stator and the base, a conductive member that is electrically connected to the coil and the substrate and has an extension that extends axially downward from the substrate, and a resin part that covers the substrate and the conductive member and connects the base and the stator. An opening that overlaps with the conductive member when viewed from the axial direction is provided on an upper axial surface of the base.

[0008] An exemplary blower device of the present invention includes a motor having the above-described configuration and an impeller that rotates together with the rotating portion. Effect of the Invention

[0009] According to the exemplary embodiment of the present invention, it is possible to appropriately seal the motor with resin while reducing the thickness of the motor. Also, according to the exemplary embodiment of the present invention, it is possible to reduce the thickness of the motor while reducing the influence of variations during manufacturing. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a blower according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view of the motor according to the embodiment of the present invention. [Diagram 3] FIG. 3 is a schematic vertical cross-sectional view of a motor according to an embodiment of the present invention. [Figure 4]FIG. 4 is a perspective view of a stationary portion of a motor according to an embodiment of the present invention. [Diagram 5] FIG. 5 is a diagram showing the stationary portion shown in FIG. 4 without the resin portion. [Figure 6] FIG. 6 is a diagram in which the substrate is removed from FIG. [Figure 7] FIG. 7 is a schematic vertical cross-sectional view showing an enlarged view of the conductive member and its periphery. [Figure 8] FIG. 8 is a plan view showing a schematic relationship between the base lower surface recess and the opening. [Figure 9] FIG. 9 is a diagram for explaining a first modified example of a motor according to an embodiment of the present invention. [Figure 10] FIG. 10 is a diagram for explaining a second modified example of the motor according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an exemplary embodiment of the present invention will be described in detail with reference to the drawings. In this specification, in describing the blower 100 and the motor 1, the direction parallel to the central axis C of the motor 1 shown in FIG. 3 is referred to as the "axial direction", the direction perpendicular to the central axis C is referred to as the "radial direction", and the direction along the arc centered on the central axis C is referred to as the "circumferential direction". In this specification, the axial direction is the up-down direction, and the side on which the base 22 is provided with respect to the stator 21 is described as the downside, and the shape and positional relationship of each part will be described. However, this definition of the up-down direction is not intended to limit the orientation of the blower 100 and the motor 1 according to the present invention when used. In this specification, the area of ​​the opening refers to the area of ​​the area in which the opening is provided. In other words, the area of ​​the opening refers to the area of ​​the opening area.

[0012] <1. Blower> FIG. 1 is a perspective view of a blower 100 according to an embodiment of the present invention. The blower 100 of this embodiment is a centrifugal fan. However, the blower to which the present invention is applied is not limited to a centrifugal fan, and may be, for example, an axial fan or a turbo fan. As shown in FIG. 1, the blower 100 has a motor 1 and an impeller 2. The blower 100 further has a fan cover 3. The motor 1 will be described in detail later.

[0013] The impeller 2 rotates about a central axis C by being driven by the motor 1. The impeller 2 has an impeller annular portion 2a and a plurality of blade portions 2b. The impeller 2 is made of, for example, resin. In this embodiment, the impeller annular portion 2a and the plurality of blade portions 2b are a single member. However, the impeller annular portion 2a and the plurality of blade portions 2b may be separate members.

[0014] The impeller annular portion 2a is annular about the central axis C. The impeller annular portion 2a is attached to a rotating portion 10 of the motor 1, which will be described later. That is, the impeller 2 rotates together with the rotating portion 10. At least a portion of each of the blades 2b is disposed on the axial upper surface of the impeller annular portion 2a. Each of the blades 2b extends from the impeller annular portion 2a in a direction away from the central axis C. The direction away from the central axis C may be parallel to the radial direction or may be inclined relative to the radial direction. The multiple blades 2b are disposed at intervals in the circumferential direction. In this embodiment, the multiple blades 2b are disposed at equal intervals in the circumferential direction.

[0015] The fan cover 3 is paired with a base 22 of the motor 1, which will be described later, to form a housing 4 of the blower 100. The fan cover 3 is provided with a cover through-hole 3a that penetrates in the axial direction and has a circular shape centered on the central axis C when viewed from above in the axial direction.

[0016] In the blower device 100, the impeller 2 rotates when the motor 1 is driven, and air flows from the outside into the housing 4 through the cover through-hole 3a. The air that flows into the housing 4 flows along the multiple blades 2b in a direction away from the central axis C, and is blown out to the outside from a housing opening 4a provided in the housing 4. In the blower device 100 of this embodiment, the axial thickness of the motor 1 can be reduced as described below, and therefore the axial thickness can be reduced.

[0017] <2. Motor> (2-1. Motor Overview) Fig. 2 is a perspective view of the motor 1 according to an embodiment of the present invention. Fig. 3 is a schematic vertical cross-sectional view of the motor 1 according to an embodiment of the present invention. As shown in Figs. 2 and 3, the motor 1 has a rotating part 10 and a stationary part 20.

[0018] The rotating portion 10 rotates about a central axis C that extends vertically. The rotating portion 10 includes a shaft 11, a bushing 12, a rotor holder 13, and a magnet 14.

[0019] The shaft 11 is a columnar member disposed along the central axis C. The material of the shaft 11 is, for example, a metal such as stainless steel. In this embodiment, the shaft 11 rotates about the central axis C. However, the shaft 11 may be fixed to, for example, the base 22 or the like and may be configured not to rotate. In other words, the shaft 11 does not have to be included in the rotating unit 10.

[0020] The bush 12 is cylindrical and extends in the axial direction. The upper end of the shaft 11 is inserted into the bush 12, and the bush 12 is fixed to the upper end of the shaft 11.

[0021] The rotor holder 13 has a covered cylindrical shape that opens axially downward. A rotor holder through hole 13a that penetrates in the axial direction is provided in the center of the upper wall of the rotor holder 13. The rotor holder through hole 13a has a circular shape centered on the central axis C in a plan view from the axial direction. A bush 12 is inserted in the rotor holder through hole 13a and fixed to the rotor holder 13. That is, the rotor holder 13 is provided to be rotatable together with the shaft 11 about the central axis C.

[0022] The rotor holder 13 is fitted into the impeller annular portion 2a, and the impeller 2 is fixed to the rotor holder 13. That is, the impeller 2 rotates together with the rotation of the rotor holder 13.

[0023] Magnet 14 is fixed to the radially inner surface of the side wall that constitutes the radially outer surface of rotor holder 13. In this embodiment, magnet 14 is a single annular magnet. The radially inner surface of magnet 14 is magnetized with N poles and S poles alternately arranged in the circumferential direction. However, instead of a single annular magnet, multiple magnets may be arranged on the radially inner surface of the side wall that constitutes the radially outer surface of rotor holder 13. In this case, the multiple magnets are arranged in the circumferential direction.

[0024] The stationary part 20 rotatably supports the rotating part 10. FIG. 4 is a perspective view of the stationary part 20 of the motor 1 according to an embodiment of the present invention. Note that FIG. 4 is a view of the motor 1 shown in FIG. 2 without the rotating part 10. FIG. 5 is a view of the stationary part 20 shown in FIG. 4 without the resin part 25. As shown in FIGS. 2 to 5, the stationary part 20 has a stator 21, a base 22, a substrate 23, a conductive member 24, and a resin part 25. The stationary part 20 further has a bearing holder 26 and a bearing 27.

[0025] The stator 21 is an armature that generates a magnetic flux in response to a drive current. The stator 21 faces at least a portion of the rotating unit 10 in the radial direction. In this embodiment, the stator 21 faces a portion of the rotating unit 10 in the radial direction. The stator 21 is disposed radially inward of the portion of the rotating unit 10. In detail, the stator 21 has a coil 213. The stator 21 further has a stator core 211 and an insulator 212.

[0026] The stator core 211 is a magnetic body. The stator core 211 is formed by laminating electromagnetic steel sheets, for example. The magnets 14 are arranged radially outward of the stator core 211 at intervals in the radial direction. The stator core 211 has an annular core back 211a centered on the central axis C, and a plurality of teeth 211b extending radially outward from the core back 211a. The plurality of teeth 211b are arranged at intervals in the circumferential direction.

[0027] The insulator 212 is an insulating material. For example, a resin is used as a material for the insulator 212. In this embodiment, the insulator 212 covers at least a part of the stator core 211. The radial outer surface of each tooth 211b is exposed without being covered by the insulator 212. The radial outer surface of each tooth 211b faces the magnet 14 in the radial direction with a gap therebetween. The coil 213 is formed by winding a conducting wire around the tooth 211b via the insulator 212. That is, the stator 21 has a plurality of coils 213.

[0028] The base 22 is disposed axially below the stator 21. In this embodiment, the base 22 is made of resin. However, the base 22 may be made of a material other than resin, such as metal. The base 22 has a base cylindrical portion 221 in the center that extends in the axial direction about the central axis C. The base 22 has a base recess 222 on its axially upper surface that is recessed axially downward and that houses the substrate 23.

[0029] The substrate 23 is disposed between the stator 21 and the base 22 in the axial direction. An electric circuit for supplying a drive current to the coil 213 is configured in the substrate 23. Various electric components are mounted on the axial upper surface of the substrate 23. The substrate 23 is provided with a first substrate through hole 23a that penetrates in the axial direction and passes the base cylindrical portion 221 therethrough. The substrate 23 is provided with a second substrate through hole 23b that penetrates in the axial direction and passes the conductive member 24 therethrough.

[0030] The conductive member 24 is electrically connected to the coil 213 and the substrate 23. The conductive member 24 is electrically connected to each of the coil 213 and the substrate 23. In this embodiment, the conductive member 24 has a pin shape extending in the axial direction. In detail, the conductive member 24 is a terminal pin in a rectangular column shape. However, the conductive member 24 may have another columnar shape, such as a cylindrical shape. The conductive member 24 is fixed to the insulator 212. A conductor wire drawn from the coil 213 is wound around the conductive member 24. A part of the conductive member 24 on the axial lower side extends axially downward from the substrate 23 through the second substrate through-hole 23b. That is, the conductive member 24 has an extension portion 24a extending axially downward from the substrate 23. The conductive member 24 is fixed to the substrate 23 on the axial lower side of the substrate 23 by solder 231 (see FIG. 7). It should be noted that a portion of the solder 231 may or may not enter the second substrate through-hole 23b. In this embodiment, the stationary portion 20 has a plurality of conductive members 24. Specifically, the number of conductive members 24 is four. However, the number of conductive members 24 may be changed as appropriate.

[0031] Note that the conductive member 24 does not have to be pin-shaped as long as it has a portion extending in the axial direction, and may be, for example, a flat terminal extending in the axial direction. The conductive member 24 only needs to be electrically connected to the coil 213, and the conductor wire drawn from the coil 213 does not need to be wound around the conductive member 24.

[0032] The resin part 25 covers the substrate 23 and the conductive member 24. The resin part 25 connects the base 22 and the stator 21. The base 22 and the stator 21 are mechanically connected by the resin part 25. The resin part 25 can be made of, for example, hot melt resin. In this embodiment, the resin constituting the resin part 25 is placed in the base recess 222 in which the substrate 23 is housed, and covers the substrate 23. The resin constituting the resin part 25 covers the conductive member 24 and the stator 21 in accordance with the shape of a mold that is temporarily placed on the axial upper surface of the base 22 during manufacturing. The stator 21, the substrate 23, and the resin part 25 covering the conductive member 24 are connected as a whole.

[0033] Resin portion 25 may cover the entire stator 21, or may not cover a portion of stator 21. That is, resin portion 25 only needs to cover at least a portion of stator 21. In this embodiment, the radial outer surfaces of teeth 211b are exposed without being covered by resin portion 25.

[0034] The bearing holder 26 is cylindrical and centered on the central axis C. The bearing holder 26 holds a bearing 27 disposed radially inward of the holder. The bearing holder 26 is fitted into the base cylindrical portion 221 and fixed to the base 22. The bearing holder 26 is disposed radially inward of the stator core 211. The stator core 211 is fixed to the bearing holder 26. That is, the stator 21 is supported by the base 22.

[0035] The bearings 27 are disposed radially outward of the shaft 11 and radially inward of the bearing holder 26, and rotatably support the shaft 11. In this embodiment, the number of bearings 27 is two, and the two bearings 27 are arranged with a gap between them in the axial direction. The two bearings 27 are constituted by ball bearings. However, the number and type of the bearings 27 may be changed as appropriate. The bearings may be, for example, sleeve bearings, etc.

[0036] In the motor 1, a rotational torque is generated between the magnet 14 and the stator 21 by supplying a drive current to the coil 213. This causes the rotor holder 13 to rotate relative to the stator 21. When the rotor holder 13 rotates, the impeller 2 fixed to the rotor holder 13 also rotates about the central axis C. Note that the motor 1 of this embodiment is an outer rotor type motor in which the magnet 14 constituting the rotating part 10 is disposed radially outward of the stator 21. However, the motor to which the present invention is applied may be an inner rotor type motor in which the magnet constituting the rotating part is disposed radially inward of the stator.

[0037] (2-2. Detailed configuration of static part) FIG. 6 is a view in which the substrate 23 is removed from FIG. 5. FIG. 7 is a schematic longitudinal sectional view showing an enlarged view of the periphery of the conductive member 24. As shown in FIGS. 6 and 7, an opening 223 is provided on the axial upper surface of the base 22, which overlaps with the conductive member 24 when viewed from the axial direction. In detail, the conductive member 24 overlaps with the region of the base 22 where the opening 223 is provided when viewed from the axial direction. More specifically, the extension 24a of the conductive member 24 overlaps with the region of the base 22 where the opening 223 is provided when viewed from the axial direction. In this embodiment, the shape of the opening 223 in a plan view from the axial direction is circular. However, the shape of the opening 223 may be other shapes, such as a polygonal shape or an elliptical shape.

[0038] By providing the opening 223, when the axial thickness of the motor 1 is reduced, it is possible to easily secure a space axially below the conductive member 24. This makes it easy to fill the resin constituting the resin portion 25 axially below the conductive member 24, and allows proper sealing with the resin. Furthermore, by providing the opening 223, it is possible to make it difficult for the conductive member 24 to come into contact with the base 22 even if the amount by which the conductive member 24 protrudes axially downward from the stator 21 varies when the axial thickness of the motor 1 is reduced. In other words, even if variations occur during manufacturing, the motor 1 can be manufactured while suppressing the effects of the variations.

[0039] When viewed from the axial direction, the openings 223 are provided at positions overlapping with the respective conductive members 24. In this embodiment, the number of conductive members 24 is multiple. Therefore, the number of openings 223 provided in the base 22 is also multiple.

[0040] As shown in FIG. 7, in this embodiment, the opening 223 is a through hole that passes through the base 22 in the axial direction. However, the opening 223 does not have to be a through hole. For example, as shown in FIG. 9 described later, the opening may be a recess. However, forming the opening 223 as a through hole as in this embodiment makes it easier to accommodate dimensional errors or assembly errors in the axial direction of the conductive member 24 compared to forming the opening as a recess. Furthermore, when the opening 223 is configured as a through hole as in this embodiment, it is possible to avoid the generation of thin portions in the base 22, thereby reducing the possibility that the base 22 will be affected by impact.

[0041] In a plan view from the axial direction, the area of ​​the opening 223 is larger than the area of ​​the extension portion 24a. In this embodiment, the diameter of the opening 223 is larger than the diameter of the extension portion 24a. With this, even if there is variation in the mounting position of the conductive members 24 to the stator 21 in a configuration in which a plurality of conductive members 24 are provided, it is possible to easily make the extension portions 24a and the openings 223 overlap with each other when viewed from the axial direction for all of the conductive members 24.

[0042] The axial lower end of the conductive member 24 is disposed axially below the axial upper end of the inner circumferential surface of the opening 223. In other words, the axial lower end of the conductive member 24 is disposed axially below the axial upper surface of the base 22 on which the opening 223 is provided. The inner circumferential surface of the opening 223 and the conductive member 24 face each other in the circumferential direction via the resin part 25. The conductive member 24 is placed within the opening 223. This makes it possible to reduce the axial distance between the stator 21 and the base 22, and thus to reduce the axial thickness of the motor 1.

[0043] In this embodiment, a resin constituting the resin portion 25 located in the opening 223 is disposed axially below the conductive member 24. In detail, in a configuration in which the conductive member 24 is placed in the opening 223, the axial lower end of the conductive member 24 is disposed axially above the axial lower end of the inner peripheral surface of the opening 223. Then, in the opening 223, the resin constituting the resin portion 25 is disposed axially below the conductive member 24. According to this configuration, it is possible to reduce the possibility that the conductive member 24 is exposed to the outside. By preventing the conductive member 24 from being exposed to the outside, it is possible to prevent foreign matter such as water and dust from adhering to the conductive member 24.

[0044] The inside of the opening 223 is preferably filled with the resin that constitutes the resin portion 25. This allows the conductive member 24 to be covered with the resin, further reducing the possibility that the conductive member 24 will be exposed to the outside.

[0045] In addition, in a configuration in which the conductive member 24 is placed in the opening 223, the axial lower end of the conductive member 24 may be configured to protrude axially downward from the axial lower end of the inner circumferential surface of the opening 223. In addition, the axial lower end of the conductive member 24 may be disposed axially upward from the axial upper end of the inner circumferential surface of the opening 223. In other words, the conductive member 24 may be configured not to be placed in the opening 223.

[0046] It is preferable that the cross-sectional area perpendicular to the axial direction of the opening 223 changes continuously or stepwise in at least a portion of the range from the axial upper end to the axial lower end of the inner circumferential surface of the opening 223. This can improve the ease of assembly of the motor 1 and improve the strength of the motor 1. When the opening 223 is circular in a plan view from the axial direction as in this embodiment, the diameter of the opening 223 may change continuously or stepwise in at least a portion of the range from the axial upper end to the axial lower end of the inner circumferential surface of the opening 223.

[0047] The cross-sectional area perpendicular to the axial direction of the opening 223 may be constant in the range from the axial upper end to the axial lower end of the inner circumferential surface of the opening 223. The diameter of the opening 223 may be constant in the range from the axial upper end to the axial lower end.

[0048] In this embodiment, the inner peripheral surface of the opening 223 has an inclined portion 223a that reduces the cross-sectional area perpendicular to the axial direction of the opening 223 from the axial upper end toward the axial lower end. This prevents the strength of the base 22 from being reduced by reducing the amount of material constituting the base 22 due to the provision of the opening 223, and makes it easier for the resin to enter the opening 223 when the resin portion 25 is formed by widening the cross-sectional area of ​​the opening 223 on the side into which the resin flows. This also prevents the strength of the base 22 from being reduced by the provision of the opening 223, and reduces the possibility that the solder 231 connecting the conductive member 24 to the substrate 23 and the like will come into contact with the base 22.

[0049] In detail, the inner peripheral surface of the opening 223 has an inclined portion 223a whose diameter decreases from the axial upper end toward the axial lower end. The inclined portion 223a is provided from the axial upper end of the inner peripheral surface of the opening 223 to a first intermediate position P1 toward the axial lower end. However, the inclined portion 223a may be provided from the axial upper end to the axial lower end of the inner peripheral surface of the opening 223. Also, the inclined portion 223a may not be provided. Also, instead of the configuration in which the cross-sectional area of ​​the opening 223 perpendicular to the axial direction is continuously reduced toward the axial lower end by the inclined portion 223a, the cross-sectional area of ​​the opening 223 perpendicular to the axial direction may be reduced stepwise toward the axial lower end. As an example of such a configuration, the diameter of the inner peripheral surface of the opening 223 may be reduced stepwise toward the axial lower end.

[0050] In this embodiment, in the range from the first intermediate position P1 in the axial direction of the inner circumferential surface of the opening 223 to the second intermediate position P2 in the axial direction, the cross-sectional area perpendicular to the axial direction of the opening 223 becomes wider as it moves axially downward. The cross-sectional area perpendicular to the axial direction of the opening 223 is wider at the second intermediate position P2 than at the axial upper end position. In the range from the second intermediate position P2 to the axial lower end position of the inner circumferential surface of the opening 223, the cross-sectional area perpendicular to the axial direction of the opening 223 is the same. In detail, in the range from the first intermediate position P1 in the axial direction of the inner circumferential surface of the opening 223 to the second intermediate position P2 in the axial direction, the diameter of the opening 223 becomes wider as it moves axially downward. The diameter of the opening 223 is wider at the second intermediate position P2 than at the axial upper end position. In the range from the second intermediate position P2 to the axial lower end position of the inner circumferential surface of the opening 223, the diameter of the opening 223 is the same.

[0051] In addition, the cross-sectional area of ​​the opening 223 perpendicular to the axial direction may be increased toward the axially downward direction in the range from the first intermediate position P1 in the axial direction to the axially lower end position of the inner circumferential surface of the opening 223. In particular, the diameter of the opening 223 may be increased toward the axially downward direction in the range from the first intermediate position P1 in the axial direction to the axially lower end position of the inner circumferential surface of the opening 223. In addition, the cross-sectional area of ​​the opening 223 perpendicular to the axial direction may be the same in the range from the first intermediate position P1 to the axially lower end position without providing a tapered shape in the axial range from the first intermediate position P1 to the second intermediate position P2. In particular, the diameter of the opening 223 may be the same in the range from the first intermediate position P1 to the axially lower end position.

[0052] Since the opening 223 is provided as described above, in this embodiment, the resin constituting the resin part 25 located inside the opening 223 has an enlarged cross-sectional area part 25a, which is larger than the cross-sectional area perpendicular to the axial direction at the axial upper end, axially below the axial upper end of the inner circumferential surface of the opening 223. According to this, the enlarged cross-sectional area part 25a is caught on the base 22, so that the resin part 25 can be made difficult to come off from the base 22 in the axial direction.

[0053] In this embodiment, the axial lower surface of the base 22 has a base lower surface recess 225 that is recessed axially upward and in which a mold used for forming the resin part 25 is temporarily placed. Fig. 8 is a plan view showing a schematic relationship between the base lower surface recess 225 and the openings 223. Fig. 8 is a plan view as viewed from below in the axial direction. The base lower surface recess 225 is arranged in each region where the openings 223 are provided.

[0054] In a plan view from the axial direction, the base underside recess 225 has a first region R1 that overlaps with the region in which the opening 223 is provided in the axial direction, and a second region R2 that surrounds the first region R1. The first region R1 is spatially connected to the opening 223. For this reason, the mold used when forming the resin part 25 contacts the second region R2. By providing the base underside recess 225, the area in which the mold contacts the base 22 can be narrowed, and the mold can be easily arranged parallel to the base 22. In addition, by providing the base underside recess 225, even if resin leaks from the opening 223 when forming the resin part 25, the resin can be prevented from protruding downward from the axial underside of the base 22. In other words, the management of the motor 1 during manufacturing can be made easier.

[0055] <3. Modifications> (3-1. First Modified Example) FIG. 9 is a diagram for explaining a first modified example of the motor 1 according to the embodiment of the present invention. As shown in FIG. 9, the opening 223A provided on the axial upper surface of the base 22A is a recessed portion recessed axially downward. Even in this case, it is possible to easily secure a space axially downward of the conductive member 24. Even if the amount by which the conductive member 24 protrudes axially downward from the stator 21 varies, it is possible to make it difficult for the conductive member 24 to come into contact with the base 22. Also, it is possible to cover the conductive member 24 by putting resin into the opening 223A. Also, when the opening 223A is a recessed portion, it is possible to prevent foreign matter such as water and dust from entering the inside from the outside through the opening. Also, by making the opening 223A a recessed portion, it is possible to prevent the resin from leaking to the outside when the resin part 25 is formed. Also, by making the opening 223A a recessed portion, it is possible to eliminate the need for a mechanism such as a mold for closing the opening when the resin part 25 is formed. In this modified example, a thin-walled portion 224 having a thin axial thickness is formed in the base 22A.

[0056] (3-2. Second Modification) FIG. 10 is a diagram for explaining a second modified example of the motor 1 according to the embodiment of the present invention. As shown in FIG. 10, the base 22B has an opening 223B configured as a through hole penetrating in the axial direction. The area of ​​the opening 223B is smaller at the axial lower end position than at the axial upper end position of the inner circumferential surface of the opening 223B. In detail, the diameter of the opening 223B is smaller at the axial lower end position than at the axial upper end position of the inner circumferential surface of the opening 223B. With this configuration, it is possible to easily fill the opening 223B from the axial upper side when forming the resin part 25. In addition, since the area of ​​the opening 223B can be reduced on the axial lower surface of the base 22B, it is possible to reduce the possibility that foreign matter such as moisture and dust will enter the inside of the motor 1 through the opening 223B from the axial lower surface side of the base 22B.

[0057] In the modified example shown in FIG. 10, the cross-sectional area of ​​opening 223B perpendicular to the axial direction changes stepwise in the axial downward direction, but the cross-sectional area of ​​opening 223B perpendicular to the axial direction may also be changed continuously in the axial downward direction.

[0058] <4. Points to note> Various technical features disclosed in this specification may be modified in various ways without departing from the spirit of the technical creation. Furthermore, multiple embodiments and modifications shown in this specification may be combined to the extent possible. [Industrial Applicability]

[0059] The present invention can be used, for example, in cooling fans for vehicles, home appliances, office equipment, etc. [Explanation of symbols]

[0060] 1. Motor 2. Impeller 10 Rotating part 20...Stationary part 21 Stator 22, 22A, 22B... Base 23... Substrate 24 Conductive member 25...Resin part 25a: Enlarged cross-sectional area 100... Blower 213 Coil 223, 223A, 223B...Aperture 223a...Slope part C...Central axis

Claims

1. A motor, a rotating part that rotates around a central axis that extends vertically; a stationary part that rotatably supports the rotating part; and The stationary portion is a stator having a coil and radially facing at least a portion of the rotating portion; a base disposed axially below the stator; a substrate disposed axially between the stator and the base; a conductive member electrically connected to the coil and the substrate, the conductive member having an extension extending axially downward from the substrate; a resin portion that covers the substrate and the conductive member and connects the base and the stator; and an opening is provided on an axial upper surface of the base, the opening overlapping the conductive member when viewed from the axial direction; In at least a part of the range from the axial upper end to the axial lower end of the inner circumferential surface of the opening, The cross-sectional area of ​​the opening perpendicular to the axial direction varies continuously or stepwise; the resin constituting the resin portion located within the opening has an enlarged cross-sectional area portion axially below the axial upper end of the inner circumferential surface of the opening, the enlarged cross-sectional area being larger than the cross-sectional area perpendicular to the axial direction at the axial upper end.

2. The motor according to claim 1 , wherein an area of ​​the opening is larger than an area of ​​the extension portion in a plan view from the axial direction.

3. The motor according to claim 1 or 2, wherein a lower end of the conductive member in the axial direction is disposed axially below an upper end of the inner circumferential surface of the opening in the axial direction.

4. The motor according to claim 1 , wherein a resin constituting the resin portion located within the opening is disposed axially below the conductive member.

5. The motor according to claim 1 , wherein the opening is a through-hole that passes through the base in the axial direction.

6. The motor according to claim 1 , wherein an area of ​​the opening is smaller at an axially lower end position of the inner circumferential surface of the opening than at an axially upper end position.

7. The motor according to claim 1 , wherein an inner peripheral surface of the opening has an inclined portion such that a cross-sectional area perpendicular to the axial direction of the opening decreases from an upper end in the axial direction toward a lower end in the axial direction.

8. A motor according to any one of claims 1 to 7; an impeller that rotates together with the rotating portion; A blower device having:

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