JP2811191B2 - DC brushless radial fan motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field of the Invention] The present invention is applied to a personal computer, a laptop computer, etc., and is adapted to cool an internal circuit thereof by sucking wind from an axial direction and radially sucking wind. The feature of the DC brushless radial fan motor (radial fan motor) for running the wind is that many of the components of the conventional DC brushless radial fan motor are used as they are, and a part of the mold is used. Just modify or process
The present invention relates to a DC brushless radial fan motor which can be formed extremely easily and at low cost.

[Prior art] DC cooling for all electronic equipment such as OA equipment, computer peripherals, power supplies, and other high-density electronic equipment
Brushless fan motors are frequently used.

Here, the trend of high-density mounting of electronic devices has come to require a further reduction in size, flatness, and weight as compared with conventionally used axial fan motors.

Many of the reasons for this are that in high-density electronic equipment, the design is very small in order to reduce the size, so the space for incorporating a DC brushless fan motor is also limited. It is required to be lightweight so that the weight does not impose a burden on the housing and the like, and more fundamentally, it can deal with the problem of heat so that it does not require the help of the fan motor as much as possible. Because of the design, if the minimum required air cooling is performed, the required purpose is increasing in many cases, and it is not necessary to use a large and expensive DC brushless fan motor with a large air volume. Cases are increasing,
This is because conditions such as small size, light weight, flatness, and low cost are given priority.

In addition, after designing electronic equipment without the need for cooling, I became worried about the generation of heat.
There are many cases where it is desired to incorporate a DC fragileless fan motor. However, in general, high-density electronic equipment is designed to be very tight as described above, and there is not enough free space. However, they could not be built in and were required to be small and flat.

The DC brushless fan motor includes a DC brushless axial fan motor that sucks wind from the axial direction and winds the wind in the axial direction, and a DC brushless fan motor that sucks the wind from the axial direction and winds the wind in the radial direction. There is a brushless radial fan motor. Former
The DC brushless axial fan motor can be formed in a flat and small structure that is thinner in the axial direction compared to the latter DC brushless radial fan motor, so it is often used in personal computers that require a small fan motor. ing.

In particular, in a device such as a personal computer that is sensitive to noise, a radial fan motor that generates a large amount of noise because the rotating blades of the rotating fan cut the air flowing from the axial direction vertically and wind in the radial direction. In comparison with the axial fan motor, the axial fan motor has an advantage in terms of noise because the rotating blades of the rotary fan cut the wind flowing from the axial direction obliquely and run in the axial direction. Flow fan motors are more commonly used.

Here, the applicant has determined that the vertical and horizontal sizes are each 60 mm.
10mm, 15mm, 20mm thickness of 60 square size, and 10mm thickness, 15mm thickness of 40 square size of 40mm length x width
We have developed an ultra-compact, 20 mm-thick, flat DC brushless axial fan motor, and have sold a considerable number of units and have achieved good results.

A DC brushless axial fan motor 5 of this type having a size of 60 squares and 10 mm will be described with reference to FIGS. 5 and 6. FIG.

The DC brushless axial fan motor 5 shown in FIGS. 5 and 6 having a coreless single-phase current-carrying structure of 10 mm thick and 60 mm square is used to form a desirable square venturi case 6 ′.
Corner flanges 8 [8-] extending radially outward at four locations at equal intervals around the outer periphery of the cylindrical Venturi case body 7 '.
1, ..., 8-4] are integrally formed. The corner flange 8 has substantially the same height between the end faces in the axial direction as that of the main body 7 ', and has an axial fan motor fixing through hole 9 penetrating in the axial direction.

The diameter of the through hole 9 is designed to be large enough to allow the screw portion of a screw (not shown) to pass therethrough because the axial fan motor 5 needs to be fixed to the fixed side using a screw. The venturi take 6 ′ is used to obtain an inexpensive square axial fan motor 5, to reinforce the strength of the venturi case body 7 ′, and to form a lead wire notch 10 described later. When the fan motor 5 is viewed from the top, the axial center side surface of the corner flange 8 and the venturi case body 7 ′ are so formed that the axial fan motor 5 can form a square as a whole in a plane. An axially thin reinforcing flange 11 connecting the axially central side surface is formed integrally with the corner flange 8 and the venturi case body 7 '.

By forming the reinforcing flange 11, the pressure strength at the side of the corner flange 8 can be increased, and sufficient strength can be maintained even when the wall thickness of the venturi case body 7 'in the radial direction is small. Therefore, the venturi case 6 'having a small thickness in the axial direction can be formed with a small material cost and a small size and light weight as a whole.

Six radially inwardly extending stays 12 are integrally formed on the bottom surface of the venturi case body 7 'in the vicinity of the reinforcing flange 11, and the motor housing part is concentric with the inner peripheral center of the venturi case body 7'. 13 are connected and integrally formed. One of the stays 12 is electrically connected to a terminal of a stator armature 14 of a coreless single-phase brushless motor built in the motor housing 13 from a notched through hole (not shown) formed at the outer bottom of the motor housing. A lead wire accommodating groove for passing a lead wire 15 for power supply or the like, which is electrically connected, is formed. The reinforcing flange 11 in the vicinity of the corner flange 8 is formed with an axially penetrating lead wire notch 10 having a shape suitable for passing the lead wire 15 in the axial direction.

The venturi case 6 'is formed by integrally forming a motor housing 13 connected to a stay 12 extending radially inward on the inner periphery of a venturi case body 7' having a recess therein. A flowing air passage hole 19 is formed in the outer periphery of the motor accommodating portion 13 at the bottom portion of the motor housing 13 to allow the wind blown by the rotating blades 17 of the rotating fan 16 to pass in the axial direction. An axially extending bearing house 18 is integrally formed at the center of the motor housing 13, and a ball bearing 20 and a sliding bearing 21 are mounted on the bearing house 18, and a rotating shaft 22 fixed to the rotating fan 16 is rotated. The rotary fan 16 is rotatably supported so that the rotary fan 16 can rotate. The rotating blades 17 are formed diagonally so that they can inhale air in the axial direction by rotating, and can wind down the outside through the flowing air passage holes 19. Further, the motor housing 13 is integrally formed with a column 23 extending upward in the axial direction at a position symmetrical with respect to 180 degrees.

A stator armature 14 is disposed on the support 23, and a screw 24 made of a non-magnetic material is formed in a stator yoke 25 through holes.
The stator armature 14 is disposed and fixed by being screwed into a screw hole 29 at the top of the column 23 through a through hole 28 formed in the printed circuit board 27. The stator armature 14 has a notch 30 having a desired shape in which the single-phase DC brushless axial fan motor 5 can be started by itself in the stator yoke 25 used for the armature. On the upper surface of the stator yoke 25, two
The air-core type armature coils 31 are provided. The armature coil 31 is formed such that the opening angle of the effective conductor portion 31 a extending in the radial direction is equal to the width of one magnetic pole of the magnet rotor 32. The printed circuit board 27 has a hole for storing the position detection element.
A position detecting element such as a hall element or a hall IC is housed in the housing hole 33. The position detecting element 34 is provided on the lower surface of the stator yoke 25 so as to face and face the lower part of the effective conductor 31a of one armature coil 31 via the cutout 30. Printed circuit board 27 is provided. On the lower surface of the printed circuit board 27, an IC for an energization control circuit (not shown) is provided.
Is housed inside. A printed circuit board 27 on which a position detecting element 34 is provided, and an energization control circuit IC is provided on the lower surface,
The stator armature 14 is formed by fixing the armature coil 31 to the lower surface of the stator yoke 25 on which the armature coils 31 are disposed by using an adhesive, and the N pole fixed to the rotating fan 16 through the axial gap 36, It is opposed to a four-pole flat magnet rotor 32 having S-pole permanent magnets so as to rotate relatively.
Reference numeral 41 denotes a rotor yoke.

Therefore, when the power is turned on, the self-startable single-phase single-phase motor formed by the magnet rotor 32 and the stator armature 14 is formed.
Since the axial fan motor 5 includes a DC brushless motor, the position detecting element 34
By detecting the magnetic poles S and S, a current in an appropriate direction is supplied to the armature coil 31 to generate a rotating torque in a predetermined direction. The rotating fan 16 rotates in a predetermined direction. The air generated by the rotating blades 17 can be discharged from the upper part in the direction by the flowing air passage hole 19 to the lower part in the axial direction. The axial fan motor 5 is very useful because it is very small, thin, and lightweight.

However, depending on the device, it may be desirable to use a radial fan motor having a different wind flow. In general, radial-dan motors are more expensive than axial-flow fan motors because of their smaller number.

Therefore, the present inventors made the wind flowing from the axial direction perpendicular to the upper part of the single-phase DC brushless motor 37 having a coreless structure similar to that used in the axial fan motor 1 as shown in FIG. Rotating blades that are cut and allow air to flow in the radial direction
Single phase coreless fitted with radial fan 40 with 39
DC brushless radial fan motor 41 was developed. Since this is a single-phase DC brushless motor 37, it is useful as in the case of the axial fan motor 1 and can be formed at low cost. Reference numeral 38 denotes a rotor yoke.

[Problems of the Related Art] The above-described axial fan motor 5 cannot flow wind in the radial direction even if it can flow wind in the axial direction.

Here, the single-phase coreless DC brushless radial fan motor 41 shown in FIG. 6 has a radial fan 40 attached to the single-phase DC brushless motor 37, which cuts the wind flowing from the axial direction at a right angle as in the conventional case, and Since the wind is caused to flow, the rotating blades 39 having a very long length in the axial direction must be used, and the radial fan motor 41 to be formed is very thick in the axial direction and becomes large and expensive. There are drawbacks. Therefore, such a radial fan motor 41 has a disadvantage that it is not suitable for a personal computer or the like that can be used only with a small and thin fan motor.

Further, in the radial fan motor 41, since the radial fan 40 cuts the wind flowing from the axial direction at a right angle and allows the wind to flow in the radial direction, there is a drawback that loud noise is generated.

Furthermore, conventionally, fan motors have to be formed into a series to form various sizes.
In order to make axial flow fan motors and radial fan motors into a series, the mold cost becomes enormous, and it is not easy to manufacture both.

[Problems to be Solved by the Invention] The present invention relates to a method of modifying a part of a mold of the DC brushless axial fan motor, which is sold in large quantities by the present applicant, by using many of the components as they are. By simply processing, it can be formed extremely easily and at low cost. If the rotary fan of the conventional axial fan motor is used as it is, the wind from the axial direction is cut obliquely without cutting at a right angle to reduce noise. You can get a DC brushless radial fan motor or use another type of rotating fan.
By using a rotary fan that has the function of sucking air from the axial direction and running in the radial direction, it is extremely easy to obtain an inexpensive DC brushless radial fan motor of another type that has a small flat structure that can also run in the radial direction. The task was to be able to do things.

[Means for Achieving the Object of the Invention] An object of the present invention is to provide a motor housing having an opening at an upper end, a closed bottom, a motor housing at a center, and an outer periphery of a DC brushless radial fan motor body. A recess for accommodating the rotating blades of the rotating fan is provided, and the rotating blades are formed to be inclined with respect to the axial direction in order to guide air from the upper end direction to the bottom direction of the main body. 1
A stator armature is formed by providing the above-described coreless armature coil, and the rotating fan having a permanent magnet having N poles and S poles at positions opposed to the stator armature with an axial gap therebetween. A notch for a flow passage for rotatably providing air, in which air guided from the upper end direction to the bottom direction of the main body by the rotating blades by the rotation of the rotary fan, flows to the outside of the side of the main body. This can be achieved by providing a DC brushless radial fan motor formed on the side surface of the main body.

[Operation of the Invention] In the DC brushless radial fan motor 1 of the present invention, the DC brushless radial fan motor case 6 has a cut-out portion 2 for a flow passage for allowing air to flow in the radial direction on a side surface thereof. When the power is turned on, the radial flow fan motor 1 is provided with a self-startable single-phase DC brushless motor formed by the magnet rotor 32 and the stator armature 14, so that the position detecting element 34 By detecting the magnetic poles of the pole and the S pole, a current in an appropriate direction flows through the armature coil 31, so that a rotating torque in a predetermined direction is generated, and the rotating fan 16 rotates in a predetermined direction. Rotating fan
The 16 rotating blades 17 suck the air from the upper part in the axial direction, cut the air obliquely, and apply the air blown to the bottom 6a and the air flowing directly in the radial direction through the notch 2 for the air flow passage in the radial direction. Wind to the outside.

[One Embodiment of the Invention] FIG. 1 shows a 60 mm × 10 mm thick size showing one embodiment of the invention.
Fig. 2 is an exploded perspective view of a DC brushless radial fan motor (DC brushless radial fan motor) 1, Fig. 2 is a top perspective view of the brushless radial fan motor 1, and Fig. 3 is a longitudinal sectional view of the brushless radial fan motor 1. One embodiment of the present invention will be described with reference to FIGS.

4 and 5 are denoted by the same reference numerals, and description thereof is omitted. Corresponding parts are denoted by reference numerals excluding dashes.

The DC brushless radial fan motor 1 having the coreless single-phase energizing structure has almost the same components as the DC brushless axial fan motor 5 described above.

The DC brushless radial fan motor body 6 of the radial fan motor 1 is configured such that the venturi case 6 'is pivoted on a side surface 7'A between corner flanges 8-1 and 8-2 on one side surface of the venturi case body 7'. It is equivalent to a configuration in which the cut-out portion 2 for the flow passage is formed so as to be cut out long in the direction and penetrates in the axial direction, and the flow passage hole 19 between the stays 12 at the bottom thereof is closed.

That is, the DC brushless radial fan motor body 6 is
The outer shape of the flat surface in which the concave portion 3 is formed inside the main body 6 is a substantially square shape. That is,
A bottom 6a described later has a square shape in a plane.
The upper end of the main body 6 has an air inlet 4 opened to allow air to flow in from the upper axial direction, and the lower end is flown to the axial bottom 6 a by the rotating blades 17 of the rotary fan 16. It is closed to prevent the wind from flowing down in the axial direction, and has corner flanges 8-1, 8-2, 8-3, 8-4 at the four corners, and also has corner flanges 8-1 and 8- One side between the two is notched long in the axial direction to form a notch 2 for a flow passage for passing air in the radial direction.

A stator armature 14 is disposed on the radial fan motor body 6 thus formed, similarly to the axial fan motor 5, and a magnet rotor (a permanent magnet having N and S poles) provided on the rotary fan 16 is provided. The rotor is rotated relative to the rotor 32 via a gap in the axial direction.

The rotating blades 17 formed on the outer periphery of the cup body 16a of the rotating fan 16 are mounted on the rotating fan 16 of the conventional axial fan motor 5.
Since it is used as it is, it is formed diagonally so that air can be sucked from the upper part in the axial direction while the air is cut diagonally, and can be blown down in the axial direction.

As a result, the rotating blades 17 of the rotating fan 16 suck air from the upper air inlet 4 in the axial direction into the concave portion 3 of the radial fan motor body 6, and hit the bottom 6a while cutting the air obliquely. The wind and the wind that has flowed directly in the radial direction flow toward the outside of the radial fan motor main body 6 in the radial direction via the flow passage notch 2 formed in the side surface of the fan motor main body 6.

In the above embodiment of the present invention, the axial fan motor 5
Although an example in which the rotary fan 16 is used as it is is shown, the present invention is not limited to this, and another appropriate rotary fan having a function of sucking air from the axial direction and running in the radial direction may be used. The brushless motor to be used is not limited to the single-phase current-carrying structure shown in the above-described embodiment, but may be a multi-phase brushless motor, or may be of a cored structure or any type. .

[Effects of the present invention] The present invention uses many of the components of the conventional DC brushless axial fan motor as they are, and uses a part of the mold, the bottom 7a of the venturi case 6 'and the side 7'A. It is only necessary to modify or process the part that forms the part to form the DC brushless radial fan motor body, so it is extremely easy and inexpensive to form an extremely lightweight and compact DC brushless radial fan motor with a small thickness in the axial direction. it can.

Moreover, in the DC brushless radial fan motor of the present invention,
If the rotary fan of the conventional axial fan motor is used as it is, not only can it be formed very inexpensively, but also according to the rotary fan, the wind from the axial direction can be cut obliquely without cutting at a right angle, resulting in extremely low noise. Because the wind blown to the bottom in the axial direction is silenced at this bottom and bends the flow path in the radial direction even when compared with the conventional axial fan motor,
Noise can be reduced.

Further, even if another type of rotary fan is used, a DC brushless radial fan motor having the same effect can be mass-produced extremely easily and at low cost.

[Brief description of the drawings]

1 is an exploded perspective view of a DC brushless radial fan motor showing one embodiment of the present invention, FIG. 2 is a top perspective view of the brushless radial fan motor, FIG. 3 is a longitudinal sectional view of the brushless radial fan motor, FIG. 4 is an exploded perspective view of a conventional DC brushless axial fan motor, FIG. 5 is a longitudinal sectional view of the brushless axial fan, and FIG. 6 is a DC brushless radial fan motor previously developed by the present inventors. It is a longitudinal cross-sectional view. [Description of References] 1,1-1 DC brushless radial fan motor, 2 Notch for air flow passage, 3 recess, 4 Air inlet, 5 DC brushless axial fan motor, 6 …… DC brushless radial fan motor body, 6a …… Bottom part, 6b …… through hole for stator, 6c …… Notch, 6 ′ …… Venturi case, 7 ′ …… Venturi case body, 8,8-1,・ ・ ・, 8-4 …… Corner flange, 9 ……
Axial fan motor fixing through hole, 10 ... lead wire engaging notch, 11 ... reinforcing flange, 12 ... stay, 13 ... motor housing, 14 ... stator armature, 15 ... lead wire, 16 ……
Rotating fan, 17 ... Rotating blade, 18 ... Bearing house, 19 ...
Flow-through holes, 20 ... Ball bearings, 21 ... Sliding bearings, 22 ... Rotary shafts, 23 ... Posts, 24 ... Screws, 25 ... Stator yoke, 26 ...
… Through-hole, 27 …… printed circuit board, 28 …… through-hole, 29 …… screw hole,
30… Notch, 31… Armature coil, 31a… Effective conductor,
32 …… Magnet rotor, 33 …… Position sensing element storage hole, 34
…………………………………………………………………………………………………………………………………………………… ……… ……… ok stuff,
… Radial fan, 41 …… Single-phase coreless DC brushless radial fan motor.

Claims (1)

(57) [Claims] 2. A DC brushless radial fan motor comprising: The upper end is open, the bottom (6a) is closed, a motor housing (13) is provided in the center, and a rotating fan (16) is provided between the outer periphery and the outer periphery of the DC brushless radial fan motor body (6). A concave portion (3) for accommodating the rotary blade (17). The rotary blade (17) is formed to be inclined with respect to the axial direction in order to guide air from the upper end of the main body (6) toward the bottom (6a). At least one coreless armature coil (31) is provided in the recess (3) to form a stator armature (14), and N is positioned at a position facing the stator armature (14) via an axial gap. The rotating fan (16) having a permanent magnet (32) having magnetic poles of S and P poles is rotatably provided. By the rotation of the rotating fan (16), the rotating blades (17) are used to move the main body (17) from the upper end to the bottom (6a).
A notch (19) for a flow passage for flowing air guided in the direction to the outside of the side of the main body (17) is formed on a side surface of the main body (17).