Motors and blowers

Abstract

To provide a technique of suppressing an amount of a resin used so as to cover a stator and a substrate, and a technique of securing a strength while suppressing an increase in the amount of the resin used in a mold.SOLUTION: A motor has a rotation part rotated with a vertically extending central axis as a center, and a stationary part rotatably supporting the rotation part. The stationary part has a stator 21 that faces against at least a part of the rotation part in a radial direction, a substrate 23 arranged below in an axial direction of the stator 21, and a resin part that covers at least a part of stator 21 and the substrate 23. The stator 21 has a plurality of coils 213 arrayed in a circumferential direction. On the upper surface in the axial direction of the substrate 23, an electric element 28 is mounted on at least one of between circumferential directions of two adjacent coils 213 among the plurality of coils 213 and the lower part of the coil 213.SELECTED DRAWING: Figure 5

Description

[Technical field]

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

[0002] Conventionally, motors integrally molded with thermoplastic resin are known. Such motors include, for example, a stator core, a drive coil wound around the stator core, a printed circuit board on which electronic components are mounted, and a stator in which the stator core, drive coil, and board are integrally molded and solidified by injection molding with electrically insulating thermosetting resin (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-022192 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a motor integrally molded with thermoplastic resin, if the size of the electrical elements mounted on the board is large, the overall size of the motor tends to be large, and as the motor size increases, the amount of resin required for molding increases, which may increase the manufacturing cost of the motor, for example.

[0005] For example, the amount of resin used in the mold can be reduced by reducing the distance between the substrate and the stator. However, if the substrate and the stator are brought closer, the thickness of the resin covering the electrical elements mounted on the substrate may become thinner to avoid contact with the rotor. It is preferable that the resin covering the electrical elements mounted on the substrate is thicker in order to increase strength.

[0006] The present invention aims to provide at least one of a technology that can reduce the amount of resin used to cover the stator and substrate in a motor, and a technology that can ensure strength while suppressing an increase in the amount of resin used in the mold. [Means for solving the problem]

[0007] An exemplary motor of the present invention has a rotating part that rotates around a central axis extending vertically, and a stationary part that rotatably supports the rotating part. The stationary part has a stator that faces at least a part of the rotating part in the radial direction, a substrate that is arranged axially below the stator, and a resin part that covers at least a part of the stator and the substrate. The stator has a plurality of coils that are arranged in the circumferential direction. An electric element is mounted on the axially upper surface of the substrate and is arranged at least either circumferentially between two adjacent coils of the plurality of coils or below the coils.

[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, the amount of resin used to cover the stator and the substrate in a motor can be reduced, and in a molded motor, the strength can be ensured while reducing an increase in the amount of resin used in the mold. [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 first embodiment of the present invention. [Diagram 3] FIG. 3 is a schematic vertical sectional view of the motor according to the first embodiment of the present invention. [Figure 4]FIG. 4 is a perspective view of a stationary portion of the motor according to the first 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 5A] FIG. 5A is a perspective view of a stator core of the motor according to the first embodiment of the present invention. [Figure 5B] FIG. 5B is a perspective view of the stator core and the insulator of the motor according to the first embodiment of the present invention. [Figure 6] FIG. 6 is a schematic cross-sectional perspective view of the motor according to the first embodiment of the present invention. [Figure 7] FIG. 7 is a diagram for explaining the positional relationship between the injection portion and the coils in the motor according to the first embodiment of the present invention. [Figure 8] FIG. 8 is a diagram for explaining the positional relationship between the gate marks and the substrate in the motor according to the first embodiment of the present invention. [Figure 9] FIG. 9 is a diagram for explaining a modified example of the motor according to the first embodiment of the present invention. [Figure 10] FIG. 10 is a schematic vertical cross-sectional view showing a state during molding of a resin portion in a motor according to a modified example. [Figure 11] FIG. 11 is a diagram showing a state in which unnecessary parts of the mold and resin have been removed from the state shown in FIG. [Figure 12] FIG. 12 is a schematic plan view showing a configuration of a part of a stationary part of a motor according to a second embodiment of the present invention. [Figure 13] FIG. 13 is a schematic cross-sectional view showing the configuration of a portion of a stationary part of a motor according to a second embodiment of the present invention. [Figure 14] FIG. 14 is a diagram for explaining the relationship between the electric elements and the stator core of the motor according to the second 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 referred to as the downside, and the shapes and positional relationships of the various parts are 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 clockwise side in the circumferential direction in FIG. 7 is referred to as one circumferential side, and the counterclockwise side in the circumferential direction is referred to as the other circumferential side. In addition, the end of the member on one circumferential side is referred to as one circumferential end, and the end of the member on the other circumferential side is referred to as the other circumferential end.

[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 is rotated by driving the motor 1, and airflow flows from the outside into the housing 4 through the cover through-hole 3a. The airflow 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. Since the axial thickness of the motor 1 can be made thin as described below, the axial thickness of the blower device 100 can also be made thin.

[0017] <2. Motor> [2-A. First embodiment] (2-A-1. Motor Overview) Fig. 2 is a perspective view of the motor 1 according to the first embodiment of the present invention. Fig. 3 is a schematic vertical cross-sectional view of the motor 1 according to the first 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 part 10 rotates about a central axis C that extends vertically. The rotating part 10 includes a rotor holder 13 and a magnet 14. The rotating part 10 further includes a shaft 11 and a bushing 12.

[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 cylindrical shape with a cover that opens downward in the axial direction. That is, the rotor holder 13 has an upper wall portion 131. The upper wall portion 131 extends in a direction intersecting the axial direction. The rotor holder 13 also has a side wall portion 132. The side wall portion 132 extends downward in the axial direction from a radially outer end portion of the upper wall portion 131.

[0022] A rotor holder through hole 13a penetrating in the axial direction is provided in the center of the upper wall portion 131. 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 bushing 12 is inserted in the rotor holder through hole 13a and fixed to the rotor holder 13. In other words, the rotor holder 13 is provided rotatable together with the shaft 11 about the central axis C.

[0023] 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.

[0024] The magnet 14 is disposed on the side wall portion 132. More specifically, the magnet 14 is fixed to the radially inner surface of the side wall portion 132. In this embodiment, the magnet 14 is a single annular magnet. The radially inner surface of the 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 disposed on the radially inner surface of the side wall portion 132. In this case, the multiple magnets are arranged in the circumferential direction.

[0025] 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 the first embodiment of the present invention. 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. However, FIG. 5 is a view of the motor 1 from a different angle than FIG. 4. As shown in FIGS. 2 to 5, the stationary part 20 has a stator 21, a substrate 23, and a resin part 25. The stationary part 20 further has a base 22, a conductive member 24, a bearing holder 26, and a bearing 27.

[0026] The stator 21 is an armature that generates magnetic flux in response to a drive current. The stator 21 faces at least a portion of the rotating part 10 in the radial direction. In this embodiment, the stator 21 faces a portion of the rotating part 10 in the radial direction. The stator 21 is disposed radially inward of the portion of the rotating part 10. The rotor holder 13 has a side wall portion 132 radially outward of the stator 21. In detail, the stator 21 has a stator core 211, an insulator 212, and a coil 213.

[0027] 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. FIG. 5A is a perspective view of the stator core 211 of the motor 1 according to the first embodiment of the present invention. 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. More specifically, each tooth 211b has a tooth main body portion 211ba extending radially outward from the core back 211a and an umbrella portion 211bb arranged radially outward from the tooth main body portion 211ba. The umbrella portion 211bb extends in the circumferential direction. A portion of the umbrella portion 211bb extends in one circumferential direction from one circumferential end of the tooth main body 211ba, and another portion extends in the other circumferential direction from the other circumferential end of the tooth main body 211ba. That is, the umbrella portion 211bb has a wider circumferential width than the tooth main body 211ba. A gap S is provided between adjacent umbrella portions 211bb in the circumferential direction.

[0028] The insulator 212 is an insulator. The material of the insulator 212 is, for example, a resin. The insulator 212 covers at least a part of the stator core 211. In this embodiment, the insulator 212 covers a part of the stator core 211. The radial outer surface of each tooth 211b is exposed without being covered by the insulator 212. That is, the radial outer surface of each umbrella portion 211bb 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. FIG. 5B is a perspective view of the stator core 211 and the insulator 212 of the motor 1 according to the first embodiment of the present invention. As shown in FIG. 5B, the insulator 212 specifically includes an upper insulator 212U disposed axially above the stator core 211 and a lower insulator 212L disposed axially below the stator core 211. The upper insulator 212U has an upper insulator annular portion 212aU having an annular shape centered on the central axis C, a plurality of upper insulator radial portions 212bU extending radially outward from the upper insulator annular portion 212aU, and an upper insulator circumferential portion 212cU disposed radially outward from each upper insulator radial portion 212bU and extending in the circumferential direction. The lower insulator 212L has a lower insulator annular portion 212aL having an annular shape centered on the central axis C, a plurality of lower insulator radial portions 212bL extending radially outward from the lower insulator annular portion 212aL, and a lower insulator circumferential portion 212cL disposed radially outward from each lower insulator radial portion 212bL and extending in the circumferential direction. The upper and lower insulator annular portions 212aU and 212aL cover the radial outer surface of the core back 211a. The upper and lower insulator radial portions 212bU and 212bL cover the tooth main body portion 211ba. The upper insulator circumferential portion 212cU is disposed above the umbrella portion 211bb and extends axially upward beyond the upper insulator radial portion 212bU. The lower insulator circumferential portion 212cL is disposed below the umbrella portion 211bb and extends axially downward beyond the lower insulator radial portion 212bL. The upper and lower insulator circumferential portions 212cU and 212cL cover the radial inner surface of the umbrella portion 211bb.The coils 213 are formed by winding a conducting wire around the teeth 211b via the insulators 212. A plurality of teeth 211b are arranged in the circumferential direction. Therefore, the stator 21 has a plurality of coils 213 arranged in the circumferential direction. In this embodiment, the number of coils 213 is six. However, the number of the plurality of coils 213 may be other than six. Furthermore, the entire radially inner and radially outer surfaces of each coil 213 are covered with the insulators 212.

[0029] 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.

[0030] The substrate 23 is disposed axially below the stator 21. The substrate 23 is disposed axially above the base 22. That is, the substrate 23 is disposed axially between the stator 21 and the base 22. 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 axially 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.

[0031] The conductive member 24 is electrically connected to the coil 213 and the substrate 23. In this embodiment, the conductive member 24 has a pin shape extending in the axial direction. More specifically, the conductive member 24 is a terminal pin having a rectangular column 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 by soldering on the axial lower side of the substrate 23. In this embodiment, the stationary portion 20 has a plurality of conductive members 24. More specifically, the number of conductive members 24 is four. However, the number of conductive members 24 may be changed as appropriate.

[0032] 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.

[0033] The resin portion 25 covers at least a part of the stator 21 and the substrate 23. The resin portion 25 is formed by molding. The resin constituting the resin portion 25 may be, for example, a hot melt resin. In this embodiment, the resin constituting the resin portion 25 is placed in the base recess 222 in which the substrate 23 is housed, and covers the entire substrate 23. In addition, the resin constituting the resin portion 25 covers almost the entire stator 21 in accordance with the shape of a mold that is temporarily placed on the axially upper surface of the base 22 during manufacturing. In this embodiment, the radial outer surface of the teeth 211b is exposed without being covered by the resin portion 25. In addition, the resin constituting the resin portion 25 is also arranged between the stator 21 and the substrate 23 in the axial direction, and between the substrate 23 and the base 22 in the axial direction. The resin constituting the resin portion 25 covers the entire conductive member 24. The resin portion 25 is continuous as a whole, and mechanically connects the base 22 and the stator 21.

[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 driving 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.

[0037] 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. According to this exemplary embodiment, it is possible to suppress an increase in the axial size compared to an outer rotor type motor, and to suppress the amount of resin constituting the resin part 25. 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.

[0038] (2-A-2. Detailed configuration of stationary part) As shown in FIG. 5, an electric element 28 is mounted on the axially upper surface of the substrate 23 and is disposed between two adjacent coils 213 in the circumferential direction among the multiple coils 213. In the present embodiment, as a preferred embodiment, the axially upper end of the electric element 28 disposed between the two adjacent coils 213 in the circumferential direction is located above the axially lower end of the coil 213. Also, at least a part of the electric element 28 disposed between the two adjacent coils 213 in the circumferential direction is disposed at a position closer to the central axis C than the radially outer end of the coil 213. In other words, at least a part of the electric element 28 is located radially inward of the umbrella portion 211bb. The number of electric elements 28 disposed between the two adjacent coils 213 in the circumferential direction may be one or more.

[0039] In this configuration, since at least a part of the electric element 28 is disposed in the space inside the stator 21, which was conventionally filled with resin, the amount of resin filled in the space can be reduced, and the amount of resin can be effectively suppressed. According to this configuration, the axial thickness of the motor 1 can be made thinner than when the electric element 28 is disposed axially below the coil 213. As a result, the amount of resin constituting the resin part 25 can be suppressed. Note that if the electric element 28 is disposed radially outward from the stator 21, the axial thickness of the motor 1 can be prevented from increasing due to the electric element 28 being axially below the coil 213. However, even in this case, since it is necessary to cover the electric element 28 with resin, the amount of resin tends to be large on the radially outward side of the stator 21.

[0040] Electric elements other than the electric element 28 may be disposed on the axially upper surface of the substrate 23, and these electric elements may be disposed radially outward of the stator 21.

[0041] In this embodiment, the electric element 28 is a capacitor. The electric element 28 is, for example, a smoothing capacitor. More specifically, the electric element 28 is an electrolytic capacitor. According to this configuration, the electric element 28, which is likely to have the highest axial height in the motor 1, is disposed circumferentially between two adjacent coils 213, so that the thickness of the motor 1 can be reduced and the amount of resin that constitutes the resin part 25 can be effectively reduced. Note that the electric element 28 may be something other than a capacitor. The electric element 28 may be, for example, an inductor such as a choke coil.

[0042] In this embodiment, the multiple coils 213 include a first coil 213a, a second coil 213b, and a third coil 213c. The second coil 213b and the third coil 213c are both adjacent to the first coil 213a. The multiple coils 213 include three other coils 213. The number of the three coils 213 may be changed. In particular, the second coil 213b is disposed adjacent to one circumferential side of the first coil 213a. The third coil 213c is disposed adjacent to the other circumferential side of the first coil 213a.

[0043] In the present embodiment, the electric element 28 includes a first electric element 28a and a second electric element 28b. The first electric element 28a and the second electric element 28b are the same type of electric element. In particular, the first electric element 28a and the second electric element 28b are both capacitors. However, the first electric element 28a and the second electric element 28b may be different types of electric elements.

[0044] The first electric element 28a is disposed circumferentially between the first coil 213a and the second coil 213b. The second electric element 28b is disposed circumferentially between the first coil 213a and the third coil 213c. Note that in this embodiment, the first electric element 28a and the second electric element 28b are present as the electric element 28 disposed circumferentially between two adjacent coils 213, but a configuration in which only one of the first electric element 28a and the second electric element 28b is present may also be used.

[0045] FIG. 6 is a schematic cross-sectional perspective view of the motor 1 according to the first embodiment of the present invention. As shown in FIG. 6, the base 22 is provided with an injection portion 223, which is a position where resin is injected from the outside into the base 22 when the resin portion 25 is formed. The injection portion 223 spatially connects the outside of the base 22 with the base recess 222. In this embodiment, the injection portion 223 is a cutout portion formed by cutting out the side wall of the base 22 from the axial lower end toward the axial upper side. In this embodiment, the resin is injected from the side. Note that the injection portion 223 may be a through hole instead of a cutout portion.

[0046] When forming the resin part 25, for example, dies are placed above and below the base 22. The dies may be configured to be placed only on the upper side of the base 22. After the injection of the resin is completed and the dies are removed, the unnecessary resin parts formed during the resin molding are removed. In this embodiment, the resin parts formed outside the base 22 from the injection part 223 are the unnecessary resin parts. When removing them, gate marks 251 (see FIG. 8) that are marks of the gates used when molding the resin part 25 are formed. That is, in this embodiment, the gate marks 251 are formed at the position of the injection part 223. The gate marks 251 are formed on the radial outer surface of the resin part 25.

[0047] FIG. 7 is a diagram for explaining the positional relationship between the injection portion 223 and the coil 213 in the motor 1 according to the first embodiment of the present invention. FIG. 7 is a schematic plan view of the stationary portion 20 from which the resin portion 25 has been removed, viewed from above in the axial direction. The injection portion 223 is illustrated in a schematic manner to facilitate understanding of the invention. It is preferable that at least a part of the injection portion 223 is located in an angular range from one circumferential end E3 of the second coil 213b to the other circumferential end E2 of the first coil 213a. It is also preferable that at least a part of the injection portion 223 is located in an angular range from one circumferential end E1 of the first coil 213a to the other circumferential end E4 of the third coil 213c.

[0048] As described above, the gate mark 251 is formed at the position of the injection portion 223. In other words, in view of this, it is preferable that at least a part of the gate mark 251 is located in an angular range from one circumferential end E3 of the second coil 213b to the other circumferential end E2 of the first coil 213a. It is also preferable that at least a part of the gate mark 251 is located in an angular range from one circumferential end E1 of the first coil 213a to the other circumferential end E4 of the first coil 213a.

[0049] That is, it is preferable that at least a part of the gate mark 251 is located in an angle range from one circumferential end of one of the two coils 213a, 213b (or 213a, 213c) to the other circumferential end of the other. The two coils 213a, 213b (or 213a, 213c) are a set of circumferentially adjacent coils with the electric element 28 disposed between them in the circumferential direction. According to this configuration, when the resin part 25 is molded, the electric element 28 disposed between the two coils 213a, 213b (or 213a, 213c) in the circumferential direction is disposed near the gate. For this reason, the resin constituting the resin part 25 can be sufficiently spread even in the narrow gap between the electric element 28 and the coil 213. That is, insulation can be appropriately ensured.

[0050] Moreover, it is preferable that the injection part 223 overlaps with either one of the two coils 213a, 213b (or 213a, 213c) in the radial direction. In other words, it is preferable that the gate mark 251 overlaps with either one of the two coils 213a, 213b (or 213a, 213c) in the radial direction. According to this, when the resin part 25 is molded, the position of the gate is shifted in the circumferential direction with respect to the electric element 28 arranged between the two coils 213a, 213b (or 213a, 213c) in the circumferential direction, so that it is possible to prevent the electric element 28 from coming off the substrate 23 due to the force of the resin. It is preferable that the position of the gate, i.e., the gate mark 251, is provided so as to avoid a position overlapping with the gap S in the radial direction. Furthermore, it is preferable that the gate position, i.e., the gate mark 251, is not provided in the angular range from the other circumferential end of one 213b of the two adjacent coils 213a, 213b to one circumferential end of the other 213a, and not in the angular range from the other circumferential end of one 213a of the two adjacent coils 213a, 213c to one circumferential end of the other 213c.

[0051] In this embodiment, the first electric element 28a is disposed between the first coil 213a and the second coil 213b in the circumferential direction, and the second electric element 28b is disposed between the first coil 213a and the third coil 213c in the circumferential direction. In this configuration in which the first electric element 28a and the second electric element 28b are provided, the injection section 223 may be positioned within an angle range from one circumferential end E3 of the second coil 213b to the other circumferential end E4 of the third coil 213c. This makes it easier for the resin to spread around the first electric element 28a or the second electric element 28b. However, it is more preferable that the injection section 223 overlaps with the first coil 213a in the radial direction. This makes it possible to inject the resin from the vicinity of the first electric element 28a and the second electric element 28b, and to prevent the first electric element 28a and the second electric element 28b from coming off the substrate 23 due to the force of the injected resin. Therefore, in the present embodiment, as a more preferable mode, the gate mark 251 is positioned within an angular range from one circumferential end E1 to the other circumferential end E2 of the first coil 213a.

[0052] Note that a portion of the gate mark 251 may be outside the angle range from one circumferential end E1 to the other circumferential end E2 of the first coil 213a. That is, at least a portion of the gate mark 251 may be located within the angle range from one circumferential end E1 to the other circumferential end E2 of the first coil 213a. Even with this configuration, when the resin part 25 is molded, both the first electric element 28a and the second electric element 28b can be disposed near the gate, and the resin can be sufficiently distributed in the narrow space between the electric element 28 and the coil 213 for both the first electric element 28a and the second electric element 28b.

[0053] Furthermore, when the second electric element 28b is not present among the first electric element 28a and the second electric element 28b, the gate mark 251 may overlap the second coil 213b, not the first coil 213a, in the radial direction. Furthermore, when the first electric element 28a is not present among the first electric element 28a and the second electric element 28b, the gate mark 251 may overlap the third coil 213c, not the first coil 213a, in the radial direction.

[0054] Fig. 8 is a diagram for explaining the positional relationship between gate mark 251 and substrate 23 in motor 1 according to the first embodiment of the present invention. Fig. 8 is a diagram showing an enlarged portion of a schematic vertical cross-sectional view of motor 1. As shown in Fig. 8, in this embodiment, the axial height position of substrate 23 is located within a range from the axial upper end to the axial lower end of gate mark 251. This allows resin injected from injection portion 223 to hit the side surface of substrate 23 when molding resin portion 25, making it easier for the resin to spread axially upward and downward of substrate 23.

[0055] The entire axial height position of the substrate 23 does not necessarily have to be located within the range from the axial upper end to the axial lower end of the gate mark 251. The axial height position of at least a portion of the substrate 23 may be located within the range from the axial upper end to the axial lower end of the gate mark 251. Furthermore, the axial height position of the substrate 23 may be significantly deviated from the axial height position of the gate mark 251.

[0056] Moreover, it is preferable that at least a portion of the substrate 23 overlaps with the gate mark 251 in the radial direction. In this embodiment, the substrate 23 overlaps with the gate mark 251 in the radial direction. With this configuration, when molding the resin part 25, it is easy to apply the resin to the side surface of the substrate 23 and to make the resin flow axially upward and downward. However, the substrate 23 does not have to overlap with the gate mark 251 in the radial direction. This configuration may be applied, for example, to a case where the substrate 23 does not exist over the entire circumference in the circumferential direction.

[0057] (2-A-3. Modifications) Fig. 9 is a diagram for explaining a modified example of the motor 1 according to the first embodiment of the present invention. Fig. 9 is a schematic perspective view of a modified motor 1A. However, in Fig. 9, the rotating part 10 and the resin part 25A of the motor 1A are omitted. Fig. 9 also shows a schematic view of a passage 202 formed by a mold 200 that is placed when molding the resin part 25A.

[0058] In the motor 1A of the modified example, the position of the injection portion 223A, which is the position where the resin is injected into the base 22A when the resin portion 25A is molded, is different from that of the above-described embodiment. The injection portion 223A is a cutout portion formed by cutting the side wall of the base 22A from the axial upper end toward the axial downward direction. Note that the injection portion 223A may be a through hole instead of a cutout portion. In this modified example, the resin is also injected from the side. Also, the injection portion 223A is located within an angular range from one circumferential end to the other circumferential end of the first coil 213a.

[0059] 10 is a schematic vertical cross-sectional view showing a state during molding of resin part 25A in motor 1A of a modified example. A mold 200 is disposed axially above base 22A. A mold may also be disposed axially below base 22A as necessary. Resin is injected through injection part 223A from molding machine nozzle 300 disposed on the side. Mold 200 is provided with passage 202 for carrying resin injected from injection part 223 to molding part 201, just before molding part 201 that forms resin part 25A. Passage 202 is a portion that includes a so-called gate.

[0060] Fig. 11 is a diagram showing a state in which mold 200 and unnecessary resin portion 252 have been removed from the state shown in Fig. 10. Resin portion 25A covers at least a portion of stator 21 and substrate 23. Unnecessary portion 252 is resin that is filled in passage 202 shown in Fig. 10. By removing unnecessary portion 252, gate mark 251A is formed on the outer surface of resin portion 25A.

[0061] In this modification, the position where the gate mark 251A is formed is separated from the position of the injection part 223A. However, in this modification, as in the above embodiment, at least a part of the gate mark 251A is located within an angle range from one circumferential end E1 to the other circumferential end E2 of the first coil 213a. For this reason, in this modification, the gate is located near each of the electric elements 28a, 28b, and the resin constituting the resin part 25A can be sufficiently spread in the narrow gap between the electric element 28 and the coil 213. That is, insulation can be appropriately ensured. In addition, when the resin part 25A is molded, it is possible to prevent each of the electric elements 28a, 28b from coming off the substrate 23 due to the force of the resin.

[0062] Note that the position of the injection part 223A may be changed from that of the modified example as long as the position of the gate mark 251A is arranged near the electric element 28. For example, the position of the injection part 223A may be shifted from the position where the gate mark 251A is formed when viewed from the radial direction. The axial height position of the injection part 223A may be shifted from the axial height position where the gate mark 251A is formed.

[0063] [2-B. Second embodiment] Next, a motor 1B according to a second embodiment will be described. The configuration of the motor 1B according to the second embodiment is generally similar to that of the first embodiment. In describing the second embodiment, the same reference numerals are used for the same parts as those in the first embodiment, and descriptions will be omitted unless otherwise necessary. In describing the second embodiment, the parts different from the first embodiment will be mainly described.

[0064] FIG. 12 is a schematic plan view showing a configuration of a part of the stationary part 20B of the motor 1B according to the second embodiment of the present invention. However, in FIG. 12, the resin part 25B constituting the stationary part 20B is omitted. FIG. 13 is a schematic cross-sectional view showing a configuration of a part of the stationary part 20B of the motor 1B according to the second embodiment of the present invention. FIG. 13 is a schematic cross-sectional view at the position XX in FIG. 12. However, in FIG. 13, the resin part 25B constituting the stationary part 20B is also shown. Note that, in FIG. 12 and FIG. 13, only the electric element (third electric element) 29, which is characteristic of the motor 1B according to the second embodiment, among the electric elements mounted on the substrate 23B is shown. The electric element 29 is an element different from the electric element 28 shown in the first embodiment.

[0065] In the second embodiment, similarly to the first embodiment, the stator 21 has a stator core 211 having teeth 211b around which conductive wires constituting coils 213 are wound.

[0066] 12 and 13, in the second embodiment, an electric element 29 is mounted on the axially upper surface of the substrate 23B, and is disposed below the coil 213. In the present embodiment, a portion of the electric element 29 is disposed below the coil 213. However, the entire electric element 29 may be disposed below the coil 213. In other words, the electric element 29 may be configured such that at least a portion of the electric element 29 is disposed below the coil 213.

[0067] Specifically, a portion of the electric element 29 is disposed between two adjacent coils 213 in the circumferential direction. In the present embodiment, the axial height of the electric element 29 is smaller than the axial distance from the substrate 23B to the coils 213. For this reason, more accurately, a portion of the electric element 29 is disposed between two adjacent coils 213 in the circumferential direction in a plan view from the axial direction. Also, a portion of the electric element 29 is disposed radially outward from the radial outer end of the coil 213. More specifically, a portion of the electric element 29 is disposed radially outward from the radial outer end 2111 of the stator core 211.

[0068] The electric element 29 may be configured so that the entirety of the electric element 29 is disposed between two adjacent coils 213 in the circumferential direction. Alternatively, the electric element 29 may be configured so that a portion of the electric element 29 is disposed between two adjacent coils 213 in the circumferential direction, and the remaining portion is disposed radially outward from the coils 213.

[0069] As described above, the electric element 29 is mounted on the axially upper surface of the substrate 23B, and is disposed at least between two adjacent coils 213 in the circumferential direction among the plurality of coils 213 and below the coils 213. With this configuration, the electric element 29 is disposed radially inward from the radially outer end 2111 of the stator core 211. Therefore, at least a part of the electric element 29 is disposed in a space that was conventionally filled only with resin, and the amount of resin to be filled can be reduced. Also, at least a part of the electric element 29 can be made thicker in the resin part 25B that covers the electric element 29 from above without being obstructed by members constituting the rotating part 10 such as the rotor holder 13. Therefore, the strength of the resin part 25B of the motor 1 can be ensured.

[0070] The axial height of the electric element 29 in this embodiment is smaller than the axial distance from the substrate 23 to the coil 213 in the first embodiment. For this reason, the axial distance between the substrate 23B and the coil 213 can be maintained as in the first embodiment, and the electric element 29 can be disposed below the coil 213. The electric element 29 is, for example, an inductor that functions as a filter that removes noise. However, the electric element 29 may be something other than an inductor.

[0071] FIG. 14 is a diagram for explaining the relationship between an electric element 29 and a stator core 211 of a motor 1B according to a second embodiment of the present invention. FIG. 14 is a diagram in which lines and symbols indicating a positional relationship are added to FIG. 13. As shown in FIG. 14, in this embodiment, the electric element 29 has a first region R1 and a second region R2. The first region R1 is a region located radially inward from a radial outer end 2111 of the stator core 211. The second region R2 is a region located radially outward from a radial outer end 2111 of the stator core 211.

[0072] In plan view from the axial direction, the first region R1 has a larger area than the second region R2. That is, in the present embodiment, in plan view from the axial direction, more than half of the electric element 29 is present radially inward from the radial outer end 2111 of the stator core 211. With this configuration, most of the electric element 29 can be disposed below the stator core 211, so that the amount of resin used can be reduced. In addition, since most of the electric element 29 can be disposed below the stator core 211, it is possible to easily increase the thickness of the resin part 25B that covers the electric element 29 from above, while avoiding interference with members that constitute the rotating part 10, such as the rotor holder 13. It is preferable that as much of the electric element 29 as possible is disposed radially inward from the radial outer end 2111 of the stator core 211.

[0073] Moreover, the maximum axial thickness of the resin part 25B present between the first region R1 and the coil 213 is greater than the maximum axial thickness of the resin part 25B present on the second region R2. According to this configuration, the thickness of the resin part 25B covering the electric element 29 from above can be made thicker than when the entire electric element 29 is disposed at the radially outer end of the stator core 211, and the strength of the resin part 25B can be ensured. Note that the maximum thickness refers to the thickness of the thickest part. The maximum axial thickness of the resin part 25B refers to the axial height of the part of the resin part 25B that has the highest axial height.

[0074] The lower end of coil 213 becomes higher in the axial direction as it moves away from tooth 211b around which it is wound in the circumferential direction. That is, the lower part of coil 213 has a curved structure that is convex axially downward in a plan view from the radial direction. For this reason, when electric element 29 is disposed below coil 213, the thickness of resin part 25B that covers electric element 29 from above can be made thicker, particularly on the circumferential end side of coil 213.

[0075] In this embodiment, as shown in Fig. 13 and Fig. 14, the resin part 25 on the second region R2 has an inclined part 253 whose axial thickness decreases radially outward. The inclined part 253 may be a flat surface or a curved surface. With this configuration, the axial thickness of the resin part 25B covering the electric element 29 from above can be made as thick as possible radially outward from the stator core 211 while avoiding contact with the members constituting the rotating part 10.

[0076] In this embodiment, specifically, the resin part 25 on the second region R2 has a flat part 254 and an inclined part 253 in this order toward the radially outward direction. The flat part 254 is a part that makes the thickness of the resin part 25 on the second region R2 constant. It is preferable that the connection part between the flat part 254 and the inclined part 253 has a curved surface shape. The flat part 254 does not have to be provided. However, it is preferable that the flat part 254 is provided in order to avoid contact with the elements constituting the rotating part 10 and to make the thickness of the resin part 25B as thick as possible.

[0077] Also, in order to avoid contact with elements constituting the rotating part 10, a step structure may be formed by providing the flat part 254 and another flat part connected to a wall surface extending axially downward from the radial outer end of the flat part 254. However, a configuration in which the inclined part 253 is provided as in this embodiment is preferable because it is easier to avoid the formation of sharp corners where stress is likely to concentrate.

[0078] <3. Notes> 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]

[0079] The present invention can be used, for example, in cooling fans for vehicles, home appliances, office equipment, etc. [Explanation of symbols]

[0080] 1, 1A, 1B... Motor 2. Impeller 10 Rotating part 13 Rotor holder 14. Magnet 20, 20B...Stationary part 21 Stator 22, 22A...Base 23, 23B... Board 25, 25A, 25B...Resin part 28, 29: Electrical elements 28a... First electric element 28b Second electric element 100... Blower 132... Side wall 211 Stator core 213 Coil 213a···First coil 213b Second coil 213c...Third coil 251, 251A... Gate marks 253...Slope part 2111 Radial outer end of stator core C...Central axis R1...1st area R2...Second area

Claims

1. A motor, A rotating part that rotates around a central axis extending vertically; A stationary part that rotatably supports the rotating part; having The stationary portion is a stator radially opposed to at least a portion of the rotating portion; A substrate disposed axially below the stator; a resin portion covering at least a portion of the stator and a substrate; having The stator has a plurality of coils arranged in a circumferential direction, An electric element is mounted on the axially upper surface of the substrate and is disposed at least one of between two adjacent coils in the circumferential direction of the plurality of coils and below the coils. the stator has a stator core having teeth around which conductive wires constituting the coil are wound, The electric element is a first region located radially inward from a radial outer end of the stator core; a second region located radially outward from a radial outer end of the stator core; having When viewed from the axial direction, the first region has a larger area than the second region, A portion of the electric element is disposed below the coil; The maximum axial thickness of the resin portion present between the first region and the coil in the axial direction is The motor has a thickness greater than the maximum axial thickness of the resin portion present on the second region.

2. The motor according to claim 1 , wherein at least a portion of a gate mark, which is a mark left by a gate during molding of the resin portion, is located within an angular range from one circumferential end of one of the two coils to the other circumferential end of the other of the two coils.

3. The gate mark overlaps with one of the two coils in the radial direction. The motor according to claim 2.

4. The motor according to claim 2 or 3, wherein the height position in the axial direction of the substrate is located within a range from an upper end to a lower end in the axial direction of the gate mark.

5. The motor according to claim 4 , wherein at least a portion of the substrate overlaps with the gate mark in a radial direction.

6. The plurality of coils include A first coil; A second coil disposed adjacent to one circumferential side of the first coil; a third coil disposed adjacent to the first coil on the other circumferential side; having The electric element is A first electric element disposed between the first coil and the second coil in a circumferential direction; A second electric element disposed circumferentially between the first coil and the third coil; having The motor according to claim 2 , wherein at least a portion of the gate mark is located within an angular range from one circumferential end to the other circumferential end of the first coil.

7. The motor according to claim 1 , wherein the electric element disposed circumferentially between the two coils is a capacitor.

8. A motor, A rotating part that rotates around a central axis extending vertically; A stationary part that rotatably supports the rotating part; having The stationary portion is a stator radially opposed to at least a portion of the rotating portion; A substrate disposed axially below the stator; a resin portion covering at least a portion of the stator and a substrate; having The stator has a plurality of coils arranged in a circumferential direction, an electric element is mounted on an axially upper surface of the substrate and disposed at least one of between two adjacent coils in a circumferential direction among the plurality of coils and below the coils; the stator has a stator core having teeth around which conductive wires constituting the coil are wound, The electric element is a first region located radially inward from a radial outer end of the stator core; a second region located radially outward from a radial outer end of the stator core; having When viewed from the axial direction, the first region has a larger area than the second region, The resin portion located on the second region has a sloped portion whose axial thickness decreases radially outward.

9. The rotating part is a rotor holder having a side wall portion radially outwardly of the stator; A magnet disposed on the side wall portion; 9. The motor according to claim 1 , further comprising:

10. A motor according to any one of claims 1 to 9; An impeller that rotates together with the rotating portion; A blower device having the above structure.

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