JPH02214456A - Dc brushless radial flow fan motor - Google Patents

Abstract

PURPOSE:To easily and inexpensively form by employing most of components of a DC brushless axial flow fan motor as they are and correcting or machining part of its die. CONSTITUTION:A DC brushless axial flow fan motor body 6 is formed in a square shape in which its profile is formed substantially in a regular square in a plane in which a recess 3 is formed in the body 6. That is, its bottom 6a is formed in a square shape in a plane. The upper end of the body 6 has an air inlet 4 opened to receive the air from the direction of an upper shaft, and the lower end is closed to block the flow of the air fed to the axial bottom 6a axially downward by the rotary blade 17 of a rotary fan 16. Corner flanges 8-1, 8-2, 8-3, 8-4 are provided at four corners, and an air flow passage cutout 2 for radially passing the air is formed by cutting out at one side axially long between the flanges 8-1 and 8-2.

Description

[Detailed Description of the Invention] [Industrial Application Field of the Invention] The present invention is suitable for use in personal computers, laptop computers, etc., and is suitable for cooling the internal circuits thereof by sucking air from the axial direction and from the radial direction. Regarding DC brushless radial fan motors (radial fan motors) for moving wind.

Its special feature is that it can be formed extremely easily and inexpensively by reusing many of the components of conventional DC brushless axial fan motors and only modifying or machining a part of the mold. The present invention relates to a DC brushless radial fan motor.

[Prior Art] DC brushless fan motors are frequently used for cooling all kinds of electronic equipment, such as office automation equipment, computer peripheral equipment, power supplies, and other high-density packaging electronic equipment.

The trend toward high-density packaging of electronic devices has led to demands for smaller, flatter, and lighter axial fan motors than conventionally used axial fan motors.

Many of the reasons for this are that high-density packaging electronic equipment is designed to the limit in order to achieve miniaturization, so the space for incorporating a DC brushless fan motor is also limited; There is a need for something lightweight so that the weight of the fan does not put a burden on the casing, etc., and furthermore, it is necessary to be able to deal with heat problems so that the fan motor does not need to be used as much as possible. Because they are designed in such a way, there are many cases where the minimum amount of air cooling required is sufficient for the specified purpose.
This is because there are many cases where it is no longer necessary to use a large and expensive C brushless fan motor with a large air volume, and where priority is given to conditions such as small size, light weight, flatness, and low cost.

Also, after designing an electronic device thinking it doesn't need cooling, you become concerned about heat generation and end up using a
There are often cases where it is desired to incorporate a C brushless fan motor, but in general, high-density mounting electronic equipment is designed to the limit of space as described above, and there is not enough free space, so conventional large-sized However, since it could not be built-in, a small, flat design was required.

There are two types of DC brushless fan motors: DC brushless axial fan motors that suck in air from the axial direction and send air in the axial direction, and DC brushless fan motors that suck air from the axial direction and send air in the radial direction. There is a brushless radial fan motor. The former DC brushless axial fan motor can be formed into a small, flat structure with a thinner thickness in the axial direction than the latter DC brushless radial fan motor. is widely used.

In addition, especially in devices where noise is a concern, such as personal computers, the rotating blades of the two-rotation fan cut the wind flowing from the axial direction vertically and travel in the radial direction, which increases the noise. Compared to fan motor,
In an axial fan motor, the rotating blades of the rotating fan cut the air flowing from the axial direction diagonally and make the air flow in the axial direction.
Such axial fan motors are more commonly used because of their noise advantages.

Here, the applicant hereby agrees that the size of the length and width is 60m each.
m 60 square size 10mm thick, 15mm thick, 20ro
m thickness, [X width size is 40mm each]
We have developed ultra-compact, flat C brushless axial fan motors with 0-angle dimensions of 10 mm, 15 mm, and 20 mm, and have sold a considerable number of them with good results.

This type of DC brushless axial fan motor 5 having a size of 60 mm x 10 mm will be explained with reference to FIGS. 4 and 5.

A DC brushless axial flow fan motor 5 with a coreless single-phase current-carrying structure having a size of 60 mm square and a thickness of 10 mm shown in FIGS. 4 and 5.
In order to form a desirable rectangular venturi case 6'', corner flanges 8[8-1... . A fixing through hole 9 is formed.

The diameter of the through hole 9 is designed to be large enough to allow the threaded portion of a screw (not shown) to pass therethrough, since it is necessary to fix the axial fan motor 5 to the stationary side using a screw. The venturi case 6' is designed to provide an inexpensive rectangular axial flow fan motor 5, to reinforce the strength of the venturi case body 7°, and to form a wire engagement notch 10, which will be described later. When the axial fan motor 5 is viewed from above, the axial central side surface of the corner flange 8 and the venturi case body 7'' are arranged so that the axial fan motor 5 can form a regular square as a whole in a plane. A reinforcing flange 11 having a thin thickness in the axial direction and connecting the side surface of the central portion in the axial direction is integrally formed with the corner flange 8 and the venturi case body 7''. By forming this reinforcing flange 11, the corner flange 8
The pressure strength on the sides of the venturi case body is increased, and even when the wall thickness in the radial direction of the venturi case body 7° is thin, sufficient strength can be maintained. Therefore, it is possible to form a venturi case 6'' that is small in material cost, small in weight, and has a small thickness in the axial direction as a whole. Six stays 12 extending radially inward are integrally formed on the bottom surface of the venturi case main body 7'' in the vicinity of the reinforcing flange 11.
The motor storage part 13 is concentrically connected and integrally formed at the center of the inner periphery of the motor. One of the stays 12 has an electric current connected to a terminal of the stator armature 14 of the coreless single-phase brushless motor built in the motor housing 13 through a notch through hole (not shown) formed at the bottom of the outer periphery of the motor housing. Lead wire 1 for power supply etc. connected to
A lead wire storage groove is formed for passing the lead wire.

A reinforcing flange 11 in the vicinity of the corner flange 8 is formed with a lead wire engaging notch 10 having a shape suitable for passing the lead wire 15 therethrough in the axial direction.

The venturi case 6° is constructed by integrally forming a motor storage portion 13 connected to a stay 12 formed on the inner periphery of a venturi case body 7′ having a concave portion inside thereof and extending in a radially inward direction. An air flow passage hole 19 is formed on the outer periphery of the motor storage portion 13 at the bottom of the motor housing 13 to allow the air blown by the rotary blades 17 of the rotary fan 16 to pass in the axial direction. A bearing house 18 extending in the axial direction is integrally formed in the center of the motor storage portion 13, and a ball bearing 20. A sliding shaft bearing 21 is attached to rotatably support a rotary shaft 22 fixed to a rotary fan 16, so that the fan 16 can rotate nine times. Sho 1
The rotary blade 17 is formed obliquely so that it can draw in air in the axial direction and travel downward to the outside through the air flow passage hole 19 by rotating twice. Further, the motor storage portion 13 is integrally formed with struts 23 that extend upward in the axial direction at 180-degree symmetrical positions.

A stator armature 14 is disposed on the support column 23, and a screw 24 made of a non-magnetic material is inserted into the support column 23 through a through hole 26 formed in the stator yoke 25 and a through hole 28 formed in the printed circuit board 27. The stator armature 14 is fixed by screwing into the screw hole 29 at the top of the stator armature. The stator yoke 25 used in the stator armature 14 is formed with a notch 30 having a desirable shape that allows the single-phase DC brushless axial fan motor 5 to start automatically. On the upper surface of the stator yoke 25, two air-core armature coils 31 are arranged 180 degrees symmetrically. The armature coil 31 is formed so 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 . Further, a one-position detection element housing hole 33 is formed in the printed circuit board 27, and a position detection element 34 such as a pole element or a Hall IC is housed in this housing hole 33. The position sensing element 34 is 5
A printed circuit board 27 on which a one-position detection element 34 is disposed is disposed on the lower surface of the stator yoke 25 so as to be located below and opposite the effective conductor portion 31a of one armature coil 31 via the notch portion 30. It is set up. Printed circuit board 27
Two ICs for an energization control circuit (not shown) are disposed on the bottom surface of the device and housed in a gap 35 on the bottom surface. A printed circuit board 27 on which a position detection element 34 is arranged and an IC for an energization control circuit on the lower surface is fixed to the lower surface of the stator yoke 25 on which two armature coils 31 are arranged on the upper surface using adhesive. This forms a stator armature 14, which rotates relative to a four-pole flat magnet rotor 32 having N-pole and S-pole permanent magnets fixed to the rotating fan 16 via an axial gap 36. They are placed face to face. In addition, code 4
1 indicates a rotor yoke.

Therefore, when the power is turned on, since the axial fan motor 5 is equipped with a self-starting single-phase DC brushless motor formed by the magnet rotor 32 and the stator armature 14, the 1st position detection element 34 is activated by the magnet. By detecting the magnetic poles of the N and S poles of the rotor 32, a current in an appropriate direction is passed through the armature coil 31, so a rotational torque in a predetermined direction is generated, and the fan 16 rotates once in a predetermined direction.

Air is sucked in from the upper part in the axial direction by the rotary vane 17, and the wind generated by the rotary vane 17 can be discharged to the lower part in the axial direction through the air passage hole 19. The axial fan motor 5 is very small, thin, and lightweight, and is therefore very useful.

However, depending on the device, it may be desirable to use a radial fan motor with a different flow of air. In general, radial dan motors are expensive because they are two fewer in number than axial fan motors. Therefore, the inventors of the present invention previously developed a single-phase DC brushless motor 37 with a coreless structure similar to that used in the axial fan motor 1 as shown in FIG.
We have developed a single-phase coreless DC bushless radial fan motor 40 in which a radial fan 39 having rotating blades 38 that cuts the wind flowing from the axial direction at right angles and makes the wind flow in the radial direction is housed in the upper part of the motor. . Since this uses the single-phase DC brushless motor 37, it is useful because it can be formed at low cost like the axial fan motor 1.

[Problems with the prior art] The above-mentioned axial fan motor 5 can flow air in the axial direction but cannot flow in the radial direction. Here, the single-phase coreless DC brushless motor shown in FIG. In the radial fan motor 40, the rotary fan 39 attached to the single-phase DC brushless motor 37 cuts the wind flowing from the axial direction at right angles and makes the wind flow in the radial direction. A radial fan motor 40 must be used with very long rotating blades 38.
However, it has the disadvantage that it is very thick in the axial direction, making it large and expensive. Therefore, the radial fan motor 40 has the disadvantage that it cannot be used in personal computers, etc., which can only be used with small and thin fan motors.

In addition, in the above radial fan motor 40, the one-rotation fan 3
9. Since the wind flowing from the axial direction is cut at right angles and the wind is made to flow in the radial direction, there is a drawback that a large amount of noise is generated. .

Yet again. Traditionally, fan motors have to be made into a series of various sizes, but in order to make a series of axial fan motors and radial fan motors, the cost of the molds is enormous, and it is difficult to manufacture both. It wasn't easy.

[Problems to be Solved by the Invention] The present invention solves the following problems: (1) The present applicant uses many of the components of DC brushless axial fan motors sold in large quantities as they are, and modifies a part of the mold. To obtain a low-noise DCC brushless radial fan that can be formed extremely easily and inexpensively by simply machining, and that allows wind from the axial direction to travel in the radial direction by cutting it diagonally instead of at right angles. It is something that has been done to solve the problem.

[Means for Achieving the Objects of the Invention] The object of the present invention is to have a concave portion inside, an air inlet opening at the upper end for inflowing air from the axial direction, and a lower end for a rotary fan. It is closed to prevent the wind that is blown to the bottom of the axial direction by the rotating blade from flowing in the axial direction, and there are corner flanges at the four corners, and the outer diameter is approximately square in the 2,000-sided plane. A DC brushless radial fan motor body in which one side is notched long in the axial direction to form a notch for a flow passage for passing air in the radial direction; A coreless stator electron consisting of one or more coreless armature coils of a coreless magnetic pole type, and a permanent magnet having magnetic poles of N pole and S pole that rotate relative to the coreless stator armature through an axial gap. The rotary fan is rotatably supported, and the rotary fan introduces air into the outer periphery of the cup-shaped main body from the upper end in the axial direction, and blows the air diagonally so that the air can be sent in the axial direction. This can be accomplished by providing a DC brushless radial fan motor with rotating blades shaped like slits.

[Operation of the invention] In the DC brushless radial fan motor 1 of the present invention, the DC
The brushless radial fan motor case 6 has a long notch in the axial direction on one side to form a draft passage notch 2 for passing air in the radial direction, so when the power is turned on, the magnetic rotor 32 and Since the radial fan motor 1 is equipped with a self-startable single-phase DC brushless motor formed by the stator armature 14, the 1-position detection element 34 detects the N pole of the magnet rotor 32 and the si magnetic pole. , *The current in any direction is passed through the armature coil 3.
1, a rotating torque in a predetermined direction is generated and the 1-rotation fan 16 rotates in a predetermined direction.The rotary blades 17 of the 0-rotation fan 16 suck air from the top in the axial direction and cut the air diagonally while rotating the fan 16 at the bottom. The wind that has hit 6a and the wind that has directly flowed in the radial direction travels to the outside in the radial direction through the air flow passage notch 2.

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

Note that the same reference numerals are given to the same parts as those explained in FIGS. 4 and 5, and the explanation thereof will be omitted. Corresponding parts are also marked with suffixes.

This coreless single-phase DC brushless radial fan motor 1 has almost the same components as the DC brushless axial fan motor 5 described above. DC brushless radial fan motor body 6 of this radial fan motor 1
The venturi case 6° is attached to a corner flange 8- on one side of the venturi case body 7″.
A configuration in which a 7° 8 part of the side surface between 1 and 8-2 is cut out long in the axial direction to form a notch for a flow passage passing through in the axial direction, and a flow passage hole 19 between the stay 12 at the bottom thereof is closed. is equal to what it is.

That is, the DC brushless radial fan motor main body 6 is
The main body 6 has a rectangular shape with a rectangular outer shape in a plane in which the recess 3 is formed inside the main body 6, and the upper end thereof has an air inlet 4 that is opened to allow air to flow in from the upper axial direction. The lower end is the rotating blade 17 of the rotating fan 16.
There are corner flanges 8-1.8-2.8-3.8-4 at the four corners that do not close in order to prevent the wind that has flowed to the bottom part 6a in the axial direction from flowing downward in the axial direction. .

Furthermore, one side between the fan corner flanges 8-1 and 8-2 is notched long in the axial direction to form an airflow passage notch 2 for passing air in the radial direction. The radial fan motor main body 6 formed in this manner is provided with a stator armature 14 similar to the axial fan motor 5 described above, and rotates relative to the magnet rotor 32 provided in the one-rotation fan 16 through an axial gap. It's moving.

Note that the rotary blades 17 formed on the outer periphery of the cup body 16a of the one-rotation fan 16 are the same as the rotary fan 16 of the conventional axial fan motor 5, so that air is sucked from the upper part in the axial direction while cutting the air diagonally. It is formed obliquely so that the air can travel downward in the axial direction.

As a result, the rotary blades 17 of the one-rotation fan 16 suck air from the upper part in the axial direction into the recess 3 of the radial fan motor main body 6, cut the air diagonally, and direct the wind that hits the bottom 6a in the radial direction. The flowing air travels to the outside of the radial fan motor main body 6 in the radial direction via the air flow passage notch 2.

[Effects of the present invention] The present invention utilizes many of the components of a conventional DC brushless axial fan motor as they are, and a part of its mold, one side 7'A of the bottom and side part of the venturi case 6''. It is only necessary to modify or process the parts that form the DC brushless radial fan motor to form the main body of the DC brushless radial fan motor, so it is possible to form a DC brushless radial fan motor that is thin in the axial direction, extremely lightweight, and small in size very easily and at low cost. . In addition, the DC brushless radial fan motor of the present invention cuts the wind from the axial direction diagonally rather than at right angles, resulting in very low noise. The wind blowing at the bottom is muffled at the bottom and bends the flow path in the radial direction, making it possible to reduce noise.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a DC brushless radial fan motor showing an embodiment of the present invention, FIG. 2 is a top perspective view of the same brushless radial fan motor, and FIG. 3 is a vertical sectional view of the same 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 same brushless axial fan motor, and Fig. 6 is a DC brushless radial 2-amplifier motor previously developed by the present inventors. It is an ME side view. [Explanation of symbols] 1... DC brushless radial fan motor 2... Notch for flow passage, 3... Recess 4... Air inlet, 5...
...DC brushless axial fan motor, 6...DC brushless radial fan motor body, 6a...bottom, 6°
...Venturi case, 7' ...Venturi case body, 8.8-1. ..., 8-4... Corner flange, 9... Through hole for fixing axial fan motor, 10
...Lead wire engagement notch 11...Reinforcement flange, 12...Ste 13...Motor storage section, 14...Stator armature, 15...Lead wire, 16... Rotating fan, 17...Rotating blade, 18...Bearing house, 19...Airflow passage hole,
20... Ball bearing, 21... Sliding bearing, 22... Rotating shaft 23... Support, 24... Screw, 25... Stator yoke, 26... Through hole, 27... Printed circuit board, 28...through hole, 29...screw hole. 30... Notch, 31... Armature coil. 31a... Effective conductor portion, 32... Magnet rotor, 33... Position detection element storage hole 34... Position detection element, 35.36... Gap, 37... Single phase DC brushless motor. 38...Rotor yoke, 39...Rotating blade. 40...Radial fan, 41...Single phase coreless D
C brushless radial fan motor. vJ, 3 Figure 6 Front 4 Figure

Claims (1)

[Scope of Claims] A DC brushless radial fan motor comprising the following components (A) to (D). (A) There must be a DC brushless radial fan motor body that meets the following conditions (a) to (e). (a) There is a recess inside. (b) The upper end has an air inlet that is opened to allow air to flow in from the axial direction. (c) The lower end is closed in order to prevent the wind blown toward the bottom in the axial direction by the rotating blades of the rotating fan from flowing in the axial direction. (d) There are corner flanges at the four corners, and the outer diameter is approximately square in plan. (e) One side between the fan corner flanges is notched long in the axial direction to form a notch for a flow passage for passing air in the radial direction. (B) One or more coreless armature coils of the coreless magnetic pole type are disposed on the bottom of the recess of the main body of the DC brushless radial fan motor to provide a coreless stator. (C) rotatably supporting a rotary fan equipped with a permanent magnet having north and south magnetic poles that rotates relative to the coreless stator armature through an axial gap; (D) The rotating fan shall have rotating blades shaped to cut the air diagonally so that air can flow into the outer periphery of the cup-shaped main body from the upper end in the axial direction and send air in the axial direction.