JPH06205567A - Fan device - Google Patents

Abstract

PURPOSE:To provide a small-sized fan device which can perform the winding work easily and automatize the winding work. CONSTITUTION:A stator 9 is equipped with a bobbin 15, which has a cylindrical drum 15a and outer collars 15b and 15c projected at both ends of the drum 15a, a cylindrical core 16, which is set in the drum 15a of the bobbin 15, and a coil 18, which is wound on the drum 15a of the bobbin 15. The core 16 comprises the first part 20 and the second part 22. The first part 20 is provided with a pair of first inward projections 19 and 19 shifted by 180 deg.C in circumferential direction from each other, and the second part 22 is provided with a pair of second inward projections 21 and 21 shifted by 180 deg. in circumferential direction from the first inward projections 19. By the current application to a coil 18, the first inward projection 19 and the second inward projection 21 facing a cylindrical rotor magnet are magnetized in different magnetic poles.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a fan device.

[0002]

2. Description of the Related Art As shown in FIG. 8, a fan device a as a small fan (for example, 25 mm square axial flow fan, thickness 10 mm) used for local cooling of electronic parts is, for example, a CP device.
The ICb such as U is mounted directly on the board c on which the ICb is mounted, and the ICb on the board c is cooled.

As shown in FIG. 9, the stator core d of the motor portion of the conventional fan device has a cylindrical body portion e and a plurality of teeth f protruding from the body portion e in the outer diameter direction. , And a coil (not shown) is wound around the tooth f to form a stator.

[0004]

Therefore, conventionally, it is necessary to wind a coil around the teeth f, but in this case, the core d is extremely small, and the coil winding work is extremely troublesome and automation is aimed at. I couldn't.

Therefore, it is an object of the present invention to provide a fan device that can easily carry out a coil winding work even if it is small.

[0006]

In order to achieve the above object, a fan device according to the present invention includes a rotor having an impeller projecting from an outer peripheral surface thereof and a cylindrical rotor magnet inside, and the rotor. A fan device including a shaft for rotatably supporting the rotor and a stator into which the rotor magnet is inserted in a loose fit, wherein the stator projects from a cylindrical body and both ends of the body. A bobbin having an outer flange portion provided, a first portion having a pair of first inner diameter direction protrusions that are offset by 180 ° in the circumferential direction, and a pair that is offset by 90 ° in the circumferential direction with respect to the first inner diameter direction protrusions. A second core having a second protrusion in the inner diameter direction, and a cylindrical core fitted into the body of the bobbin, and wound around the outer periphery of the body of the bobbin and facing the rotor magnet. First of the above core
A coil that magnetizes the inner diameter direction protrusion and the second inner diameter direction protrusion to different magnetic poles by energization.

[0007]

When a current is applied to the coil, a magnetic flux in the axial direction is generated in the core, whereby the first portion is magnetized to the N pole (or S pole) and the second portion is magnetized to the S pole (or N pole). , The first inner diameter direction protrusion and the second inner diameter direction protrusion are magnetized to different magnetic poles.

Therefore, by switching the energizing direction to the coil, it is possible to change the magnetization polarity of the first and second projecting portions in the inner diameter direction, whereby the rotor is rotated by utilizing the attraction / repulsion to the rotor magnet. be able to.

The coil is wound around the outer periphery of the body of the bobbin, and the winding work is easy.

[0010]

The present invention will be described in detail below with reference to the drawings illustrating the embodiments.

FIG. 1 shows a fan device according to the present invention, which is used, for example, for local cooling of electronic parts.

This fan device comprises a housing 1 mounted on a substrate (not shown) on which an IC such as a CPU is mounted, and a motor section 2 housed in the housing 1.

The motor portion 2 is a central cylindrical portion 3 of the housing 1.
A shaft 6 that is rotatably supported by bearings 5 and 5 in a brass bearing housing 4 that is insert-molded into the rotor 6, a rotor 7 fixed to one end of the shaft 6, and a rotor magnet 8 of the rotor 7. And a stator 9 into which is loosely inserted.

That is, the rotor 7 has a plurality of impellers 11 ... Protrudingly provided on the outer peripheral surface 10 thereof, and has the cylindrical rotor magnet 8 therein.

A board 12 is fixed to the central cylindrical portion 3 of the housing 1, and the electronic parts 13 forming a rotation control circuit are mounted on the board 12.

At the position corresponding to the magnet of the substrate 12,
The Hall element 13a of the electronic component 13 is mounted, and the hole 14 is formed at the position corresponding to the magnet.

Then, the stator 9 is fixed on the substrate 12.

Therefore, as shown in FIGS. 1, 2, 3, and 4, the stator 9 has a bobbin 15 made of an insulating resin material.
And a cylindrical core 16 fitted into the bobbin 15, and the bobbin 15
And a coil 18 wound around the outer peripheral groove 17.

That is, the bobbin 15 has a cylindrical body portion 15a,
Outer collar portions 15b and 15c are provided at both ends of the body portion 15a, and the outer peripheral groove 17 is formed by the outer peripheral surface of the body portion 15a and the inner surfaces of the outer collar portions 15b and 15c.

Further, the core 16 has a first portion 20 having a pair of first inner diameter projecting portions 19 and 19 which are offset by 180 ° in the circumferential direction, and 90 ° in the circumferential direction with respect to the first inner diameter projecting portion 19. And a second portion 22 having a pair of second inner diameter projecting portions 21, 21 that are offset from each other.

The first and second parts 20 and 22 each have an inner surface of 18
The first part 20 and the second part 22 are formed by integrally laminating a plurality of laminations made of a thin silicon steel plate or the like having a pair of first inner diameter projecting portions that are offset by 0 °.
The second inner diameter direction protruding portion 21 is integrated with the inner diameter direction protruding portion 19 so as to be displaced by 90 ° in the circumferential direction.

Therefore, in this case, the first part 20 and the second part 22 can be the same, and there is an advantage that parts can be shared.

When a plurality of laminations are laminated and integrated, a plurality of laminations are laminated and then a part of the laminated body is plastically deformed to be integrated. It is also possible to stack a plurality of laminations and then integrate them without distinguishing from the second portion 22.

Although the first portion 20 and the second portion 22 are in close contact with each other in the illustrated example, it is preferable to provide a slight gap between the first portion 20 and the second portion 22.

The rotor magnet 8 of the rotor 7 is loosely fitted in the core 16, and the rotor magnet 8 has the first inner diameter direction protrusions 19 and 19 and the second protruding portion 19 of the core 16 inserted therein.
The radially projecting portions 21, 21 face each other.

When the coil 18 is wound around the bobbin 15 in which the core 16 is fitted and a current is passed through the coil 18, for example, a magnetic flux as shown by an arrow in FIG. 20 becomes the S pole, the second portion 22 becomes the N pole, and the first inner diameter direction protrusions 19 and 19 and the second inner diameter direction protrusions 21 and 21 form magnetic poles.

That is, the first inner diameter direction protruding portion 19 and the second inner diameter direction protruding portion 21 are magnetized to different magnetic poles by energizing the coil 18.

Therefore, by switching the energization to the coil 18, the direction of the generated magnetic flux can be reversed and the magnetization polarities of the first and second inner diameter direction protrusions 19 and 21 can be changed. Thus, the rotor 7 can be rotated by utilizing the attraction / repulsion of the rotor magnet 8.

Specifically, in this case, two coils 18 are used, and as shown in FIG. 4, one ends 18a, 18a of the two coils 18, 18 are connected to the connection fitting 23a by soldering. , The bobbin with these two coils 18, 18 in a doubled state
The other end of the two coils 18 and 18 are wound around the body 15a of 15
18b and 18b are soldered to different connection fittings 23b and 23c, respectively.

The connecting fittings 23a, 23b, 23c each include a fitting portion 24 having a U-shaped cross section and a pin 25 projecting from the fitting portion 24. When the stator 9 is fixed to the board 12, the pin 25 is fitted into one outer flange portion 15c of the bobbin 15, and the pin 25 is inserted into a hole (not shown) of the board 12,
It is connected to the land portion of the substrate 12.

Then, as shown in FIG. 5, a switching circuit
26, the energizing direction is sequentially switched to the X and Y directions.

By the way, in this embodiment, as shown in FIG. 2, a gradient is formed on the inner surface of each of the first and second inner diameter projecting portions 19, 19, 21, 21 to form the rotor magnet 8 and the first. The distance between the second inner diameter direction protrusions 19, 19, 21, and 21 is set so as not to be uniform in the circumferential direction.

This is because the circumferential center of the radially projecting portions 19, 19, 21, 21 and the magnetic center of the magnetic pole are deviated from each other so that a dead point does not occur, thereby facilitating rotation during energization.

In FIG. 1, 27 is a spring disposed between the pair of bearings 5 and 5, which is located at the central portion of the inner peripheral surface of the bearing housing 4 and the one end of the shaft 6. It is interposed between the outer ring of the bearing 5.

Next, FIG. 6 shows another embodiment. In this case, as compared with the fan device shown in FIG.
15 shapes are different.

That is, the bobbin 15 has a cylindrical body portion 15a,
Outer collar portions 15b and 15c protruding from both ends of the body portion 15a, and a lid portion 15d having a lid-like opening on the substrate 12 side of the body portion 15a.
And a plurality of protrusions 30 ... Are provided on the wall portion 29 formed by the outer collar portion 15c and the lid portion 15d.

This protrusion 30 is a small hole 31 provided in the substrate 12.
It is fitted into the press-fitting portion so that the stator 9 is securely fixed to the substrate 12.

The outer flange 15c has a circumferential protruding piece 32
Is formed, and the circumferentially protruding piece portion 32 is in contact with the substrate 12.

The lid portion 15d includes a receiving portion 33 that receives the second portion 22 of the core 16, a contact portion 34 that contacts the substrate 12, and a cylindrical portion 35 that is erected from the contact portion 34. Become.

As shown in FIG. 7, the cylindrical portion 35 is provided with projections 36 ... Which project in the inner diameter direction. The projections 36 ... As shown in FIG.
It is fitted into a concave groove 38 provided on the outer peripheral surface 37 of the.

As a result, the substrate 12 can be held between the bobbin 15 and the central cylindrical portion 3 of the housing 1, and the bobbin 15 can be fixed at the same time.

As shown in FIG. 7, if the slit 39 in the axial direction is formed on the end face of the cylindrical portion 35, the cylindrical portion 35 has elasticity and the protrusion 36 is fitted into the concave groove 38. Will be easier.

Further, the lid portion 15d of the body portion 15a of the bobbin 15 is
A claw 40 projecting in the inner diameter direction is formed at the opening edge (on the side where the core 16 is not provided) to prevent the core 16 from coming off.

By the way, when the stator 9 is assembled, the second portion 22 and the first portion 20 are sequentially fitted into the body portion 15a of the bobbin 15, so that the body portion 15a of the bobbin 15 can be easily fitted. It is also preferable to form a slit in the axial direction in the opening edge portion.

Therefore, also in this fan device, the rotor 7 is rotated by switching the power supply to the coil 18.

The present invention is not limited to the above-mentioned embodiments, and the design can be freely changed without departing from the gist of the present invention. For example, each lamination of the first part 20 and the second part 22 of the core 16 can be performed. The number can be freely increased or decreased as long as the first part 20 and the second part 22 are the same, and the inner and outer diameter dimensions of the core 16 can be changed.

If the bearing housing 4 is made of a magnetic material (eg, stainless steel), it can function as a back yoke.

[0048]

Since the present invention is configured as described above, it has the following effects.

By switching the power supply to the coil 18, the first
The magnetization polarity of the second inner diameter projecting portions 19 and 21 can be changed, and the rotor 7 rotates, whereby the electronic components in the vicinity of the fan device can be reliably cooled.

The coil 18 is a cylindrical body of the bobbin 15.
Even if the bobbin 15 has a small diameter, the winding work can be extremely easy because it can be wound around 15a, and unlike the conventional case, the winding work can be automated and productivity can be improved. It will be excellent.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged plan view of a main part.

FIG. 3 is an operation explanatory view.

FIG. 4 is an exploded perspective view of a stator.

FIG. 5 is an electric circuit diagram.

FIG. 6 is an enlarged cross-sectional view of another embodiment.

FIG. 7 is an enlarged perspective view of a main part of a bobbin of the stator.

FIG. 8 is a simplified diagram showing a usage state of a conventional fan device.

FIG. 9 is an enlarged plan view showing a stator core of a conventional stator.

[Explanation of symbols]

 6 shaft 7 rotor 8 rotor magnet 9 stator 10 outer peripheral surface 11 impeller 15 bobbin 15a body part 15b outer flange part 15c outer flange part 16 core 18 coil 19 first inner diameter protruding part 20 first part 21 second inner diameter protruding part 22 Part 2

Claims (1)

[Claims] 1. A rotor 7 having an impeller 11 ... Protrudingly provided on an outer peripheral surface 10 and having a cylindrical rotor magnet 8 therein, and a shaft 6 for rotatably supporting the rotor 7.
A stator 9 into which the rotor magnet 8 is loosely inserted
A fan device including:
A bobbin 15 having a cylindrical body portion 15a and outer flange portions 15b and 15c projecting from both ends of the body portion 15a, and a pair of first inner diameter projecting portions 19 and 19 that are offset by 180 ° in the circumferential direction. It comprises a first portion 20 and a second portion 22 having a pair of second inner diameter direction protrusion portions 21, 21 which are displaced by 90 ° in the circumferential direction with respect to the first inner diameter direction protrusion portion 19, and the body portion of the bobbin 15 described above. A cylindrical core 16 fitted into the bobbin 15 and the core wound around the outer periphery of the body portion 15a of the bobbin 15 and facing the rotor magnet 8;
A fan device, comprising: a coil (18) that magnetizes different first magnetic poles by energizing the first inner diameter direction protruding portion (19) and the second inner diameter direction protruding portion (21).