WO2021059976A1

WO2021059976A1 - Fan device

Info

Publication number: WO2021059976A1
Application number: PCT/JP2020/034091
Authority: WO
Inventors: 祐司大村; ▲方▼ 余
Original assignee: ミネベアミツミ株式会社
Priority date: 2019-09-27
Filing date: 2020-09-09
Publication date: 2021-04-01

Abstract

The objective of the present invention is to provide a thin fan device having a waterproof function and a dustproof function.　In a fan device (1), an impeller (20), a motor (30) for rotating the impeller (20), and a board (40) provided with electronic components for driving the motor (30) are arranged inside a casing (10) comprising first and second casing members (11, 12), wherein: one or a plurality of recessed portions (12a) are formed on an inner surface of the first casing member (12); a stator (31) of the motor (30) is accommodated in the recessed portions (12a); and the board (40) blocks the openings of the recessed portions (12a).

Description

Fan device

The present invention relates to a fan device.

Conventionally, in an electronic device such as a personal computer or a mobile phone, a fan device may be used to dissipate heat and cool the electronic components mounted on the device in order to improve the heat dissipation.
In such an electronic device such as a personal computer or a mobile phone, it is difficult to secure a wide space for incorporating the fan device, so that the fan device is required to be smaller and thinner.

When thinning the fan device, the motor used for the fan device is an axial gap type motor as compared with a radial gap type motor (a motor having a gap in the radial direction perpendicular to the rotation axis). (A motor having a gap in the same direction as the rotating shaft) is easier to reduce the thickness in the axial direction. As a fan device using this type of axial gap type motor, for example, there is a heat dissipation fan described in Patent Document 1.

FIG. 9 shows an exploded perspective view of a conventional fan device using this type of axial gap type motor. As shown in FIG. 9, the conventional fan device 100 includes an upper casing 101, a lower casing 102, an impeller 103, a rotor 104, and a substrate 105. A coil set 106 formed by a printed pattern is provided on the substrate 105, and the coil set 106 functions as a stator.

A gap is formed between the coil set 106 and the rotor 104, and when a controlled current is applied to the coil set 106, the generated magnetism causes the rotor 104 to be rotatably supported through the gap. It rotates and the impeller 103 fixed to the rotor 104 rotates. Due to such a structure, if an axial gap type motor as shown in FIG. 9 is used, the height of the heat radiating fan 100 in the axial direction can be suppressed to a low level.

Japanese Unexamined Patent Publication No. 2010-281241

Fan devices incorporated in electronic devices such as personal computers and mobile phones may be required to have waterproof and dustproof functions depending on their use and usage environment.

However, the conventional fan device as shown in FIG. 9 does not have any waterproof function or dustproof function. Therefore, the conventional axial gap type motor as shown in FIG. 9 is not suitable for applications that are required to have a waterproof function and a dustproof function.
In view of the above problems, the present invention makes it an example of a problem to provide a thin fan device having a waterproof function and a dustproof function.

The above problem is solved by the following invention. That is, in one aspect of the fan device of the present invention, an impeller, a motor for rotating the impeller, and an electronic component for driving the motor are installed inside a casing composed of first and second casing members. With the board provided,
One or more recesses are formed on the inner surface of the first casing member.
The stator in the motor is housed in the recess and
The substrate closes the opening of the recess.

In the above aspect of the fan device of the present invention, the substrate may be a flexible printed wiring board or a printed wiring board.
Further, in the above aspect of the fan device of the present invention, the substrate may be composed of a substrate main body provided with printed wiring and a lid portion for closing the opening of the recess.

In the above aspect of the fan device of the present invention, the substrate may include the electronic component on the surface on the recess side. In this case, the stator may include a coil, and the coil and the electronic component may be housed in the recess.

In the above aspect of the fan device of the present invention, even if the substrate and one of the casing members are tightly joined by a sealing material surrounding the opening of the recess to close the opening of the recess. Good.
Further, in the above aspect of the fan device of the present invention, the motor may be an axial gap type motor.

According to the present invention, it is possible to provide a thin fan device having a waterproof function and a dustproof function.

It is a perspective view of the fan apparatus which concerns on 1st Embodiment which is an example of this invention. FIG. 5 is a sectional view taken along the line AA in FIG. 1 of the fan device according to the first embodiment which is an example of the present invention. It is an exploded perspective view which disassembled the fan device which concerns on 1st Embodiment which is an example of this invention in the axis x direction. FIG. 5 is an exploded perspective view of the fan device according to the first embodiment, which is an example of the present invention, disassembled in the axis x direction and viewed from a direction different from that of FIG. It is an enlarged cross-sectional view of the fan apparatus which concerns on 1st Embodiment which is an example of this invention, and shows only the left half of FIG. It is an exploded perspective view which disassembled the fan device which concerns on 2nd Embodiment which is an example of this invention in the axis x direction. It is the same cross-sectional view as FIG. 2 of the fan apparatus which concerns on 2nd Embodiment which is an example of this invention. It is an enlarged cross-sectional view of the fan apparatus which concerns on 2nd Embodiment which is an example of this invention, and shows only the left half of FIG. It is an exploded perspective view of the conventional heat dissipation fan (fan device) using an axial gap type motor.

Hereinafter, the fan device according to the first embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of the fan device 1 according to the first embodiment which is an example of the present invention, and FIG. 2 is a cross-sectional view relating to a cross section taken along the line AA in FIG.
In the description of the first embodiment, the terms "upper" and "lower" mean the vertical relationship in FIGS. 1 and 2, and do not necessarily match the vertical relationship in the direction of gravity.

Further, in the axis x direction (hereinafter, also referred to as "axial direction"), the arrow a direction is defined as the upper side a, and the arrow b direction is defined as the lower side b. Further, the clockwise direction (circumferential direction seen from the upper side a) around the rotation axis x is the circumferential direction e, and the counterclockwise direction is the circumferential direction f.

FIG. 3 is an exploded perspective view showing the fan device 1 by disassembling each member in the axis x direction. Further, FIG. 4 is an exploded perspective view of the fan device 1 viewed from a direction different from that of FIG. 3, in which each member is disassembled in the axis x direction. Further, FIG. 5 is an enlarged cross-sectional view in which the left half of FIG. 2 is enlarged.

The fan device 1 of the first embodiment is a casing 10 composed of an upper casing 11 which is a second casing member and a lower casing 12 which is a first casing member, and an outer shape of a substantially rectangular parallelepiped is formed. .. Inside the casing 10, an impeller 20, a motor 30 for rotating the impeller 20, and a substrate 40 provided with an electronic component 43 for driving the motor 30 are arranged.

The casing 10 is provided with a suction port 13 on the surface a on the upper side in the axis x direction, and is provided on one side surface of the casing 10 with a discharge port 14 for discharging the air sucked from the suction port 13 to the outside of the casing 10. There is. The upper casing 11 and the lower casing 12 are both made of resin.

The suction port 13 is a circular opening and is provided in the upper casing 11. The discharge port 14 is formed on one side surface between the upper casing 11 and the lower casing 12, and an inclined surface 12 g is formed on the lower casing 12 side. By rotating the impeller 20 in the clockwise circumferential direction e, external air is sucked in from the suction port 13 and discharged from the discharge port 14.

The motor 30 is an axial gap type motor, and is composed of a stator 31, a rotor 32, a shaft 32c, and a bearing 34. Further, the stator 31 is composed of three air-core coils 36, a core 37 composed of three core cores 37a and a disk-shaped core plate 37b having a circular opening.

Both the core core 37a and the core plate 37b are made of a soft magnetic material. The core plate 37b is formed with three through holes at equal intervals in the circumferential direction (circumferential direction e or circumferential direction f), and the central circular opening allows the boss portion 15 formed in the lower casing 12 to pass through. It becomes a hole for. The core core 37a has a cylindrical shape, and one end of the core core 37a is fitted into each of the three through holes formed in the core plate 37b, whereby the core core 37a and the core plate 37b are connected to each other and the core plate is formed. Three core cores 37a are erected from 37b toward the upper side a.

On the other hand, the rotor 32 is composed of a disk-shaped rotor magnet 32a having a circular opening in the center, a back yoke 32b made of a disk-shaped soft magnetic material having a circular opening in the center, and a shaft 32c. The impeller 20 coupled with the rotor 32 also functions as a rotor of the motor 30.

The impeller 20 is composed of a hub 21 and a plurality of blades 22, and a through hole 23 for press-fitting the shaft 32c of the motor 30 is formed in the center of the hub 21. The plurality of blades 22 all have the same shape, and are evenly arranged in the circumferential direction from the outer peripheral surface of the hub 21. Further, the impeller 20 is a "rearward blade" having a shape curved so as to be convex in the rotation direction (clockwise circumferential direction e). The hub 21 and the plurality of blades 22 are made of resin and are integrally molded.

An annular recess 24 is formed on the lower end surface of the hub 21 (the surface facing the substrate 40). A disc-shaped back yoke 32b and a rotor magnet 32a, which are components of the rotor 32, are housed in the recess 24 and are bonded with an adhesive. The rotor magnet 32a has a plurality of magnetic poles formed in the circumferential direction.

Further, the shaft 32c is press-fitted into the through hole 23 formed in the center of the hub 21, and the shaft 32c is fixed to the hub 21. For the coupling between the shaft 32c and the hub 21, instead of press-fitting, the shaft 32c and the impeller 20 may be integrally molded by insert molding.
A recess 25 centered on the through hole 23 is formed in the center of the lower end surface of the hub 21 (inside the annular recess 24). A part of the boss portion 15 of the lower casing 12 is inserted into the recess 25 and arranged.

An annular recess (hereinafter referred to as an "annular recess") 12a is formed in the lower casing 12, and a cylindrical boss portion 15 standing on the upper side a in the axis x direction is formed in the center of the annular recess 12a. It is formed. A bottomed circular hole 15a is formed in the boss portion 15. The bearing 34 of the motor 30 is fitted and attached to the circular hole 15a.

The lower casing 12 has recesses (hereinafter, referred to as “electronic component accommodating recesses”) 12b for accommodating electronic components (resistors, capacitors, etc.) 43 mounted on the substrate 40, which will be described later, drive control IC 44, and the like. It is formed separately from the annular recess 12a.
Inside the inner circumference of the annular recess 12a (in other words, outside the outer circumference of the cylindrical boss portion 15), a stepped portion 15b that expands in diameter below the boss portion 15 is formed, and the stepped portion 15b of the step portion 15b is formed. An inner trench 12c is formed on the upper surface. Further, the lower casing 12 is formed with an outer trench 12d so as to surround both the annular recess 12a and the electronic component accommodating recess 12b.

Sealing materials (for example, double-sided adhesive tape) 12e and 12f (see FIG. 5) coated with an adhesive on both sides are embedded in the inner trench 12c and the outer trench 12d, respectively, and one of the adhesive surfaces is inside. It is attached to the bottom of the trench 12c and the outer trench 12d. The other adhesive surface of the sealing

materials

12e and 12f is attached to the substrate 40, and the substrate 40 is adhered to the lower casing 12 via the sealing

materials

12e and 12f arranged in the inner trench 12c and the outer trench 12d. There is. That is, the substrate 40 closes the openings on the upper side a of both the annular recess 12a and the electronic component accommodating recess 12b.

The assembly process when manufacturing the fan device 1 of the first embodiment will be described.
The disc-shaped core 37 is housed in the annular recess 12a formed in the lower casing 12, and the core 37 to which the core core 37a is bonded is adhered with an adhesive previously applied to the bottom surface of the annular recess 12. .. Next, the sealing

materials

12e and 12f are attached to the substrate 40 on which the three coils 36 are mounted in advance, and the sealing

materials

12e and 12f are located at the positions of the inner trench 12c and the outer trench 12d formed in the lower casing 12. The substrate 40 and the lower casing 12 are joined so as to be aligned with each other.

At this time, the three coils 36, which are the constituent parts of the stator 31, are housed in the annular recess 12a, and the core core 37a is fitted into each coil 36, respectively. The electronic component 43 mounted on the substrate 40 and the drive control IC 44 are housed in the electronic component accommodating recess 12b formed in the lower casing 12. Then, as described above, the substrate 40 closes the openings of both the annular recess 12a and the electronic component accommodating recess 12b formed in the lower casing 12.

The substrate 40 is a flexible printed wiring board (FPC), and includes a circular portion 41 and a wiring lead-out portion 42 extending outward from a part of the outer peripheral edge of the circular portion 41. A circular hole 41a for inserting the boss portion 15 is formed in the center of the circular portion 41. The substrate 40 is mounted on one side, and a wiring pattern 45 is formed on the surface on one end side (lower side b) in the axis x direction, and a drive control IC 44 for driving the motor 30 and electronic components (resistors, capacitors). Etc.) 43 is implemented.

Next, a circular resin thrust washer 35 is arranged at the bottom of the circular hole 15a of the cylindrical boss portion 15 formed in the lower casing 12, and the bearing 34 is fitted into the circular hole 15a. The bearing 34 is a sintered oil-impregnated bearing (for example, a copper-based metal alloy) that rotatably supports the shaft 32c.

A unit in which the impeller 20 and the rotor 32 are integrally formed is manufactured, and the shaft 32c coupled to the impeller 20 is inserted into the bearing 34 fitted in the circular hole 15a of the boss portion 15 formed in the lower casing 12. As a result, the impeller 20 is assembled to the lower casing 12 to which the substrate 40 is joined.

Next, by mounting the upper casing 11, the fan device 1 is completed. At this time, the wiring drawing-out portion 42 of the substrate 40 protruding outward from the casing 10 is pulled out from the notch 11a formed in the upper casing 11 to the outside of the casing 10. The wiring lead-out portion 42 of the substrate 40 is sandwiched between the upper casing 11 and the lower casing 12. The power supply from the outside is performed through the wiring pattern 45 formed in the wiring lead-out portion 42 of the substrate 40.

In the joining between the upper casing 11 and the lower casing 12, a plurality of convex portions are formed on the joint surface of the upper casing 11, a plurality of concave portions are formed on the joint surface of the lower casing 12, and the convex portions are fitted into the concave portions. It is made by fitting (not shown). The method of joining the upper casing 11 and the lower casing 12 is not limited to this, and the concave portion and the convex portion, which are the joining means, may be formed on the opposite casing member, or the lower casing 12 may be used as another joining means. The casing member of the above is provided with an engaging claw, and the engaging claw is engaged with the other casing member to be joined, or the joining surfaces of the upper and

lower casings

11 and 12 are bonded with an adhesive. It may be a configuration.

In the fan device 1 of the first embodiment, as can be seen from FIGS. 2 and 5, the stator 31 and the rotor 32 are arranged so as to face each other with the substrate 40 in between. That is, the stator 31 and the rotor 32, which are the components of the motor 30, are separated by the substrate 40, and the motor 30 constitutes an axial gap type motor.

The unit in which the substrate 40, the motor 30 including the stator 31 and the rotor 32, and the impeller 20 are assembled to the lower casing 12 is formed in the recess 25 formed on the lower end surface of the hub 21, and the boss portion 15 of the lower casing 12 is formed. It is placed with a part in it. Therefore, the height dimension in the axis x direction can be reduced, and the fan device 1 can be made thinner.

In the fan device 1 according to the first embodiment, the core 37 having the core core 37a and the disc-shaped core plate 37b is housed in the annular recess 12a of the lower casing 12 together with the coil 36 mounted on the substrate 40. ing. Further, the electronic component 43 and the drive control IC 44 mounted on the substrate 40 are housed in the electronic component accommodating recess 12b of the lower casing 12.

The openings of the annular recess 12a and the electronic component accommodating recess 12b are closed with the substrate 40 covered. As described above, the lower casing 12 and the substrate 40 are joined by the sealing

materials

12e and 12f previously attached to the outer peripheral edge of the substrate 40 and the peripheral edge of the circular hole 41a. As a result of the substrate 40 being tightly joined to the lower casing 12 by the sealing

materials

12e and 12f attached to the peripheral edge of the substrate 40, the stator 31 composed of the core 37 and the coil 36 is sealed in the annular recess 12a. Will be done. Further, mounting components such as the electronic component 43 and the drive control IC 44 are sealed in the electronic component accommodating recess 12b.

Therefore, even if dust or moisture enters the fan device 1 from the discharge port 14, for example, it is possible to prevent the dust or moisture from entering the inside of the annular recess 12a and the electronic component accommodating recess 12b closed by the substrate 40. Can be done. Therefore, the fan device 1 of the first embodiment has a waterproof function and a dustproof function while having a simple configuration.

Further, in the fan device 1 according to the first embodiment, the motor 30 has an axial gap type motor configuration, and the core 37 and the coil 36 are provided in the annular recess 12a formed in the lower casing 12, and the electronic component accommodating recess. By accommodating the electronic component 43, the drive control IC 44, and other mounting components in the 12b, the dimensions in the axis x direction can be reduced. As a result, the overall height of the fan device 1 can be suppressed, and the fan device 1 can be made thinner.

Although the fan device of the present invention has been described above with reference to the preferred first embodiment, the fan device of the present invention is not limited to the configuration of the above first embodiment. For example, in the first embodiment, the FPC is used as the substrate 40 for covering and closing the opening of the recess (annular recess 12a and electronic component accommodating recess 12b; the same applies hereinafter) formed in the lower casing 12. However, it is not limited to this. The use of FPC as a substrate is suitable for reducing the thickness of the fan device, but the substrate on which wiring is formed covers the mounting components housed in the recesses formed in the lower casing 12. All you need is.

The substrate may be, for example, a printed wiring board (PCB) in addition to the flexible printed wiring board (FPC), or may be composed of an FPC, a PCB, or a composite material with other members. Good. Examples of such a composite material include a composite material of FPC and PCB, a composite material of FPC or PCB and a member other than these, and the like. In particular, it is not necessary to cover the entire opening of the recess with only the wiring board such as FPC or PCB. For example, a substrate body composed of a wiring board such as FPC or PCB, a lid portion that closes the opening of the recess, and the like. It may be a substrate made of. At this time, the lid portion that closes the opening of the recess may be a cover member that covers the wiring board such as FPC or PCB.

Further, in the first embodiment, the double-sided adhesive tape is used as the sealing material, but any sealing material such as an adhesive can be used as long as it has adhesiveness (adhesiveness). May be used. Further, from the viewpoint of ease of positioning, workability, and thinning,

trenches

12c and 12d are formed, and double-sided adhesive tape is provided in the

trenches

12c and 12d. A protrusion may be formed on the surface, and the protrusion may be used as a positioning guide. Further, if the total height (thickness) of the fan device is not particularly limited, the sealing material may be arranged directly on the lower casing without forming a trench.

Further, in the first embodiment, the substrate 40 and the lower casing 12 are closely bonded with a sealing material to provide a dustproof function and a waterproof function, but a double-sided adhesive tape is arranged. A trench that surrounds the trench from the outside is further formed, and the trench formed on the outside is filled with a sealing material (for example, silicone) to seal between the substrate and the lower casing, thereby providing dustproof performance and waterproofing. It may be configured to further enhance the performance.

In the first embodiment, the motor 30 has a three-phase structure as an example, but may have a single-phase structure. Further, the number of coils is not limited to three, and it is sufficient that the number of coils is provided according to the structure, purpose, and desired performance such as a three-phase structure or a single-phase structure.

In the first embodiment, the stator 31 is provided with a core 37 composed of a core core 37a and a core plate 37b in order to strengthen the magnetic force of the coil 36. Although the magnetic force is weakened, the stator 31 has a core plate 37b. It does not have to be, and even if the core core 37a is not provided, it can function as a motor to form a fan device.

Subsequently, the fan device according to the second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 6 is an exploded perspective view of the fan device 70 according to the second embodiment of the present invention, which is disassembled in the x-axis direction. FIG. 7 is a cross-sectional view similar to FIG. 2 of the fan device 70 according to the second embodiment of the present invention. FIG. 8 is an enlarged cross-sectional view of the fan device 70 according to the second embodiment, which is an example of the present invention, and shows only the left half of the fan device 70 in FIG. 7.

As shown in FIG. 6 in which the corresponding portions corresponding to those in FIG. 3 are designated by the same reference numerals, the fan device 70 according to the second embodiment basically has the same basic configuration as the fan device 1 of the first embodiment. It has, and here, for convenience, different components will be mainly described. In the fan device 70 according to the second embodiment, the core 77 is provided in place of the core 37 in the first embodiment.

The stator 71 is composed of three air-core coils 36 and a core 77, which are the same as those in the first embodiment. The core 77 has a core back portion 77a formed of an annular shape of a thin plate, and three projecting portions 77b having a rectangular shape in a plan view, which protrude from the inner peripheral side edge of the core back portion 77a so as to extend toward the center in the radial direction. And have. Both the core back portion 77a and the protruding portion 77b are made of a soft magnetic material.

These three projecting portions 77b are arranged at intervals of 120 degrees in the circumferential direction, and are located at positions facing the air-core coil 36 mounted on the substrate 40, and are arranged on the lower surface side of the coil 36. ing. Each of the three protrusions 77b extends by a predetermined length toward the center of the core back portion 77a. The core back portion 77a and the three protruding portions 77b of the core 77 are integrally formed.

In the fan device 70 of the second embodiment having such a configuration, the core core 37a (corresponding to the magnetic core (iron core)) is not provided unlike the fan device 1 of the first embodiment. Although the magnetic force is weaker than that of the coil 36 of the fan device 1, it has a magnetic force sufficient to function as a motor.

By the way, in the fan device 1 of the first embodiment, the core 37 composed of the core core 37a and the core plate 37b can strengthen the magnetic force of the air-core coil 36, but on the other hand, the strong magnetic force of the core 37a causes the rotor magnet 32a. The adsorption force between the core 37 and the core 37 acts strongly. Then, the strong suction force acts as a brake that hinders the rotation of the rotor 32, which in turn hinders the rotation of the impeller 20 coupled to the rotor 32, and a desired air volume characteristic may not be obtained.

On the other hand, in the fan device 70 of the second embodiment, the magnetic force of the air-core coil 36 is lower than that of the fan device 1 of the first embodiment, but the rotor magnet 32a and the core 77 are attracted by that amount. Since the force is weakened and the rotation of the impeller 20 is not hindered, the desired air volume characteristic can be surely obtained. As described above, in the fan device 70 of the second embodiment, the core back portion 77a is provided with the protruding portion 77b as a substitute for the core core 37a instead of providing the core core 37a, thereby functioning as a motor. The suction force between the rotor 32 and the core 77 is weakened, the rotation of the impeller 20 is suppressed from being hindered, and a desired air volume characteristic can be obtained.

In addition, those skilled in the art can appropriately modify the

fan devices

1 and 70 of the present invention according to conventionally known knowledge. As long as the modification still has the constitution of the present invention, it is, of course, included in the category of the present invention.

1, 70 ... fan device, 10 casing, 11 ... upper casing (second casing member), 11a ... notch, 12 ... lower casing (first casing member), 12a ... annular recess (recess), 12b ... electronic component Accommodating recess (recess), 12c ... Inner trench, 12d ... Outer trench, 12e ... Sealing material, 12f ... Sealing material, 12g ... Inclined surface, 13 ... Suction port, 14 ... Discharge port, 15 ... Boss, 15a ... Circular hole , 15b ... stepped portion, 20 ... impeller, 21 ... hub, 22 ... blade, 23 ... through hole, 24 ... recess, 25 ... recess, 30 ... motor, 31 ... stator, 32 ... rotor, 32a ... rotor magnet, 32b ... Back yoke, 32c ... shaft, 34 ... bearing, 35 ... thrust washer, 36 ... coil, 37, 77 ... core, 37a ... core core, 37b ... core plate, 40 ... substrate, 41 ... circular part, 41a ... circular hole, 42 ... Wiring lead-out part, 43 ... Electronic component, 44 ... Drive control IC, 45 ... Wiring pattern, 77a ... Core back part, 77b ... Protruding part, 100 ... Conventional heat dissipation fan, 101 ... Upper casing, 102 ... Lower casing, 103 ... Impeller, 104 ... Rotor, 105 ... Board, 106 ... Coil assembly

Claims

Inside the casing composed of the first and second casing members, an impeller, a motor for rotating the impeller, and a substrate provided with electronic components for driving the motor are arranged.
One or more recesses are formed on the inner surface of the first casing member.
The stator in the motor is housed in the recess and
A fan device in which the substrate closes the opening of the recess.
The fan device according to claim 1, wherein the board is a flexible printed wiring board.
The fan device according to claim 1, wherein the board is a printed wiring board.
The fan device according to any one of claims 1 to 3, wherein the board comprises a board body provided with printed wiring and a lid portion that closes an opening of the recess.
The fan device according to any one of claims 1 to 4, wherein the substrate includes the electronic component on the surface on the concave side.
The fan device according to claim 5, wherein the stator includes a coil, and the coil and the electronic component are housed in the recess.
The fan according to any one of claims 1 to 6, wherein the substrate and one of the casing members are tightly joined by a sealing material surrounding the opening of the recess to close the opening of the recess. apparatus.
The fan device according to any one of claims 1 to 7, wherein the motor is an axial gap type motor.