KR900007272Y1 - Brushless fan motor - Google Patents

Abstract

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Description

Brushless fan motor

1 is a plan view of a fan motor using a conventional single-phase disk-type brushless motor.

2 is a longitudinal sectional view of the fan motor.

3 is a bottom view of a six-pole field magnet used for the fan motor.

4 is a plan view of the stator armature of the fan motor.

5 is an explanatory diagram of an ideal synthetic torque curve.

6 is a perspective view of a rotating fan in which the field magnet forming unit and the rotating shaft are integrally formed by a plastic magnet used in the single-phase disc-type brushless fan motor of the present invention.

7 is a perspective view of the rotor yoke integrated with the inner surface portion of the rotating fan of FIG. 6 by plastic.

FIG. 8 is a perspective view of a rotating fan in which a magnet of magnets in which a plurality of N and S driving magnetic poles are magnetized is formed on an inner surface of the rotating fan of FIG.

FIG. 9 is a perspective view when two inner rings are fixed to a rotating shaft of the rotating fan of FIG. 8. FIG.

10 is a perspective view of a fixed shaft of a single-phase disc-type brushless fan motor of the present invention.

11 is a longitudinal cross-sectional view of a single-phase disc type brushless fan motor.

12 is a plan view of the stator armature.

Fig. 13 is a plan view of a stator armature showing another embodiment.

* Explanation of symbols for main parts of the drawings

1, 1 ': single phase disc type brushless fan motor

2: fan motor case 3: motor case

4, 4 ': pin 5: perforation

6: bearing holder 7: bearing

8, 8 ': rotating shaft 9, 9': rotating fan

10, 10 ': rotating fan body 11: rotor yoke

12: field magnet 13: gap

14, 14 ': stator armature 15: position detection element

16: single phase disc type brushless motor

17, 17 ', 17 ": Stator yoke 18-1, 18-2: Armature coil

19: magnetic material projection for generating magnetoresistive torque

20: printed board 21: electrical component exclusion space

22: terminal 23: cutout

24: generating torque curve 25: energizing switching point

26: magnetoresistance torque curve 27: synthetic torque curve

28: field magnet forming portion 29'-1, 29'-2: ball axis number

30: inner ring 31: outer ring

32: Steel balls 33, 33-1, 33-3, 34, 34 ': Cut out part

33a: end 35, 35 ': terminal

36, 37: electric parts 38: stay

The present invention relates to a brushless fan motor which can be mass-produced even when the number of parts is small and therefore inexpensive.

It also relates to a brushless fan motor, in particular a disc type brushless fan motor, using a magnetically movable single phase brushless motor.

Brushless motors are widely used in recent years because of their high reliability and high reliability compared to shapes, and because of their high reliability.

In addition, disc-shaped brushless motors (also called flat motors) of axial gap-type structures having voids in the axial direction are widely used in OA devices and the like because they are suitable for thinning.

Here, in the brushless motor, circuits (drive circuits ... energization control circuits) for energizing the magnetic field magnets N and S poles to the armature coils using position sensing elements such as Hall elements are required as much as the upper portion of the motor. The disadvantage is that it becomes expensive.

Therefore, it is therefore undesirable to use such expensive brushless motors for fan motors used for the purpose of blowing and cooling.

In order to solve this drawback, there are only one position detecting element and only one phase of the energization switching circuit, and a single phase (one phase energized) brushless motor which can be constructed at low cost is used for the fan motor.

As the single-phase disc type brushless motor is applied to a fan motor, there are ones shown in FIGS. 1 to 4.

1 shows a single-phase disk-type brushless fan motor 1 including a motor case 3 in the center of a planar square fan motor case 2 and a pin 4 described later on the outer peripheral bottom of the motor case 3. It forms a ball-free 5 for sending wind by).

The rotating shaft 8 is supported by the rotating material 8 by the bearing 7 formed in the inner peripheral part of the holder 6 in the center of the motor case 3, and the rotating shaft 8 is supported. The rotating fan 9 is fixed to the top part.

The rotary fan 9 integrally forms a fin 4 for blowing air in the axial side perforation 5 direction on the outer circumference of the main body 10.

The rotor yoke 11 and the field magnet 12 are fixed to the rear surface of the rotating fan main body 10, and the field magnet 12 is 2P in which the magnetic poles of N and S are alternated (P is an integer of 2 or more). As the pole, for example, the six-pole ring is shown in FIG.

The stator armature 14 is formed in the field magnet 12 through the axial gap 13, and the rotor yoke 11, the field magnet 12, and the stator armature 14, which are mainly supported by the rotating material, are formed. And a single phase disk type brushless motor 16 as the position detecting element 15 to be described later.

The stator armature 14 arranges two concentric armature coils 18-1 and 18-2 in the in-phase position symmetric with 130 degrees on the upper surface to be opposed to the field magnet 12 of the stator yoke 17. A position detecting element 15 such as a hall element and a magnetic body projection 19 for generating magnetoresistance are formed, and energization is provided on the lower surface of the stator yoke 17. The printed circuit board 20 is disposed on the lower surface of the substrate 20. The space 21 for accommodating the electric component for forming the energization control circuit is formed.

The armature coils 18-1 and 18-2 are divided into magnetic field magnets (18a and 18 ′ a) to contribute to radial generating locks in order to be a single phase disk type brushless motor 16 having good efficiency. The magnetic pole width of 12), i.e., a concentric one having a width of 60 degrees.

The magnetic body for generating the magnetoresistive torque 19 formed on the upper surface of the stator yoke 18 is formed by the one-side electric coil, that is, the one-side effective conductor portion 18'a of the armature coil 18-2. It is formed to have the same width as the magnetic pole width (60 degrees in the machine angle) at the front position away from the electrical angle of 90 degrees (the magnetic angle, that is, 45 degrees in the machine angle) toward the rotation direction (arrow A direction).

The position detecting element 15 is disposed in a substantially intermediate position between the effective conductor portion 18'a of the armature coil 18-1 and the effective conductor portion 18a of the armature coil 18-2, and the terminal 22 thereof. ) Is electrically connected to the printed board 20 on the bottom surface thereof through the cutout 23 formed in the stator yoke 17.

According to the single-phase disk-type brushless fan motor 1 having such a configuration, even if only one position detecting element 15 can be moved, the field magnet 12 can be rotated in the direction of arrow A. can do.

In the single-phase disk-type brushless fan motor 1, if no magnetic resistance projections 19 for magnetoresistance are formed, they are generated by the armature coils 18-1 and 18-2 as shown in FIG. The lock curve is in the form indicated by reference numeral 24, but the lock becomes zero at the energization switching point 25.

It has so-called dead points.

Therefore, sometimes when the field magnet 12 is stopped, when the position detecting element 15 is stopped at a position opposite to the dead point, starting torque can be obtained even if the motor 1 is energized, which is not suitable for practical use. .

Therefore, the magnetoresistance torque curve 26 shown in FIG. 5 is obtained by forming the magnetoresistance projections 19 for magnetoresistance at the positions as shown in FIG.

The magnetoresistive torque indicated by the magnetoresistive torque curve 26 is generated by the suction force between the projection 18 and the field magnet 12, and is set to the size of two half one of the generated torque curve 24. desirable.

The combined torque of the curves 24 and 26 is obtained as shown in the synthetic torque curve 27, and the single-phase disc-shaped brushless fan motor 1 having no dead spot is obtained.

However, in the case of such a single-phase disk-type brushless fan motor 1, the projections 19 must be formed on the upper surface of the stator yoke 17, so there are disadvantages such as an increase in the number of parts and the number of assembly operations.

In addition, a cutout 23 is formed in the stator yoke 17, and the electric parts disposed on the printed circuit board 20 on the lower surface of the stator yoke 17 through the cutout 23 and the armature on the stator yoke 19. The coils 18-1 and 18-2 must be electrically connected, and if the insulation measures of the stator yoke 19 are not sufficiently established, there is a possibility of short-circuit and structural complexity, which is not suitable for mass production.

In addition, in the single-phase disk-type brushless fan motor 1, or other fan motors, which are designed to be inexpensive, the rotor yoke 11 must be positioned and fixedly fixed to the rotating fan 9.

In order to support the rotating fan 9 with the rotating material, an expensive metal rotating shaft 8 must be used, and the rotating shaft 8 must be accurately positioned and fixed to the rotating fan 9. It is also complicated and therefore inexpensive to mass production.

Therefore, the present invention aims at eliminating the above-mentioned drawbacks, eliminating the difficulty in mounting the stator yoke and the rotating shaft, and at the same time, providing a rotating fan having the stator yoke and the rotating shaft at low cost and quantitatively. In detail, the rotary fan 9 'is axially formed on the outer circumference of the cap-shaped rotary fan body 10', which is formed flat in the axial direction by injection molding of plastic. The stator is provided through a pin 4 'for blowing wind, and an axial gap between the rotating shaft 8' and the rotating fan main body 10 'extending in the lower axial direction at the center of the rotating fan main body 10'. The circle shown in FIG. 7 positioned on the rotating fan main body 10 'facing the armature 14' and opposite to the field magnet 12, which will be described later, and disposed at a predetermined position at the time of plastic injection molding. Phantom Rotor York (11) The integrally molded plastic by injection molding of plastic.

In this case, the rotor yoke 11 may be integrated with the mold means as shown on the lower surface of the rotating fan main body 10 '. In this embodiment, the rotor yoke 11 and the rotor yoke 11 are rotated by rotating the fan 9'. Since the field magnet 12 to be fixed completely excludes the fear of escaping from the rotating fan 9 ', the rotor yoke 11 is placed on the plastic so as to be located inside the rotating fan body 10' as shown in FIG. It molds and integrates.

Therefore, in Fig. 6, the rotor yoke 11 is not visible.

Moreover, since the rotating shaft 8 'is integrally formed with the rotating fan body 10' by plastic, the sintered metal is not suitable as the oilless metal bearing as the bearing, and a ball bearing is suitable as the bearing.

Therefore, in this case, it is preferable to fix the inner ring 30 of the ball shaft number to the rotating shaft 8 'as mentioned later, and to rotate the rotating shaft 8' and the inner ring 30 fixed to it integrally.

The single-phase disc-shaped brushless fan motor 1 'includes a motor case 3 at the center of the fan motor case 2, and a pin that blows air in the axial direction while rotating at the outer peripheral end of the motor case 3. A perforation 5 for sending wind generated by 4 'is formed.

38 is a stay connecting the fan motor case 2 and the motor case 3 to each other.

A bearing holder 6 is provided at the center of the motor case 3, and ball bearings 29'-1 and 29'-2 are provided at upper and lower ends of the inner peripheral portion of the bearing holder 6 as shown in FIG. ), And the rotating shaft 8 'is supported by the rotating material.

The inner ring 30 of the ball bearings 29'-1 and 29'-2 is fixed to the upper and lower two-stage positions of the rotation shaft 8 '.

The inner ring 31 of the ball bearings 29'-1 and 29'-2 is fixed to the bearing holder 6, and steel balls are mounted between the inner ring 30 and the outer ring 31. As shown in FIG.

Therefore, the rotating shaft 8 'smoothly rotates the inner ring 30 in contact with the steel balls 32.

The rotating fan 9 'fixes the six-pole annular field magnet 12 as shown in Fig. 3 at a position opposite to the inner rotor yoke 11 of the main body 10' (Fig. 8). Reference).

The field magnet 12 is a 2P (P is an integer of 2 or more) poles in which the magnetic poles of N and S are alternately used. For example, 6 poles are used as shown in FIG. It is not.

The stator armature 14 'is formed in the field magnet 12 through the axial gap 13.

A single-phase disc type brushless motor is mainly formed by the field magnet 12, the stator armature 14 ', the position detecting element 15, the stator yoke 17' and the like supported by the rotating material.

The stator armature 14 'is a 180-degree symmetrical statue of two concentric armature coils 18-1 and 18-2 on an upper surface portion that will face the field magnet 12' of the stator yoke 17 '. I locate it at a position.

The lower surface of the stator yoke 17 'is provided with the printed board 20 for disposing an electrical component on the lower surface as mentioned above.

In the stator yoke 17 ', one cutout 33 is formed to magnetically drive the brushless fan motor 1'.

Therefore, the printed board 20 is exposed through the cutout 33 as shown in FIGS. 10 to 12.

Therefore, the position detecting element 15 is disposed on the upper surface of the printed board 20 exposed through the cutout 33, so that the magnetic pole of the field magnet 12 can be detected.

The cutout portion 33 formed in the stator yoke 17 'not only cuts out but also generates magnetoresistive torque so that the brushless fan motor 1' can be moved automatically. The ideal synthesized torque curve 27 shown must be obtained.

In order to obtain an ideal synthesized torque curve 27, the cutout 33 is n · T (n is an integer equal to or greater than 1 when the magnetic pole width of the field magnet 12 is T, and the field magnet 12 It is an integer less than the number of poles).

In addition, in this embodiment, the cutout part 33 is formed in the width | variety of 60 degree | times by using the same width | variety of one pole width of the field magnet 12, ie, the field magnet 12 of 6 poles.

The length in the radial (radial) direction of the cutout 33 may be appropriately designed such that the maximum value of the magnetoresistance torque is one half of the maximum value obtained by the generated torque curve 24.

In this way, the length in the radial direction of the cutout part 33 is set to the length of about two half one of the radius of the stator yoke 17 '.

In this way, the positional relationship between the stator yoke 17 'having the cutout 33 and the armature coils 18-1, 18-2 is a position where one end 33a of the cutout 33 is to generate the maximum torque. The stator yoke 17 'may be disposed so as to be between the positions of the dead points at.

However, in order to obtain the brushless fan motor 1 'of the preferred synthetic torque curve 27, the rotational direction (arrow A) at a position where one end of the cutout 33, that is, the end 33a, can obtain the maximum torque. Direction so that it is in front of a quarter of one stimulus width.

Therefore, in this embodiment, the end 33a is located in the quadrant one pole, that is, 15 degrees ahead from the effective conductor portion 18'a of the armature coil 18-2 toward the rotation direction (arrow A direction). The stator yoke 17 'is provided so that it may be.

Small cutouts 34, 34 'are formed in the outer circumferential portion at the position facing the cutout portion 33 of the printed board 20. As shown in FIG.

Each terminal 35, 35 ′ of the armature coils 18-1, 18-2 is guided to the rear surface of the printed board 20 through the cutouts 34, 34 ′ and formed on the printed board 20. It is electrically connected to the electric component 36 for forming a drive circuit disposed on the rear surface of the printed board 20 through the non-distributioned printing pattern.

Since the single-phase disc-shaped brushless fan motor 1 'having such a configuration is stopped at the end of the cut-out portion 33, for example, 33a is attracted and opposed to the center of the N pole or the S pole of the field magnet 12. In addition, since the position detecting element 15 always detects the N or S poles, even if the position detecting element 15 is one, the magnetic field can be rotated in the direction indicated by the arrow A. Can form

In addition to the position detecting element 15, an expensive electrical component 37 or the like may be disposed on the printed board 20 facing the cutout portion 33.

FIG. 13 is a plan view of the stator armature 14 "of the second embodiment of the present invention. In this stator armature 14", the cutouts 33-1 and 33- having the same width as the magnetic pole width of the field magnet 12 are shown. 2 and 33-3 are formed in the stator yoke 17 "position spaced apart by even-numbered magnetic poles (two magnetic poles in this embodiment) at equal intervals to eliminate the radial load.

In this way, for example, when the N poles of the field magnet 12 are completely overlapped with one cutout portion, the N poles are also overlapped with the other cutout portion as well. Therefore, the suction force is balanced, no radial load is generated, the friction is small, and the bearing life is increased.

As described above, the present invention eliminates difficult integration work while taking concentric and rotational balance between the rotating fan, the rotor yoke, and the rotating shaft as in the conventional brushless fan motor, that is, the rotating fan, the rotor yoke, and the rotating shaft are integrated with a plastic mold. Next, the field magnet is fixed, so it does not use expensive rotating shafts, so it can be mass-produced at low cost.

In addition, the single-phase disc-type brushless fan motor to which the present invention is applied reduces the number of parts and assembly work, and increases the weight and prevents electrical shorts, because projections for obtaining magnetoresistive torque are unnecessary. In addition, since the cutout is formed at the same time in forming the stator yoke, the cost for this is extremely small and at the same time, the rotating shaft and the rotating fan can be easily formed together.

In addition, according to the single-phase disc-type brushless fan motor to which the present invention is applied, since there is no protrusion on the stator yoke and the position detecting element can be disposed in the cutout portion, it is also possible to arrange a large number of armature coils on the stator yoke and high torque degree. It is possible.

This is particularly effective in the case of a so-called sheet coil in which the armature coil is formed by means of etching or the like.

The rotating fan in the above embodiment may be formed by blowing wind in the radial direction by rotating to form a radially blowing brushless fan motor.

In addition, the brushless fan motor, which is naturally applied to the cap-type structure and the iron core structure, was described as having six poles as a field magnet. However, the brushless fan motor is not limited thereto, and two armature coils are used. Although it is shown, of course, even if it is one, it is effective also in three or more cases.

Claims (9)

In a fan motor having a rotating fan 9 'having a pin 4' for blowing air as it rotates, the rotor yoke 11 is fielded when the rotating fan 9 'is integrally formed of plastic. Exposed at the position opposite to the magnet 12, integrated with plastic, and the rotating shaft 8 'is formed integrally with plastic, and a plurality of magnets are formed at the position of the rotating fan opposite to the rotor yoke 11 to form a plurality of magnetic poles. A brushless fan motor, characterized in that the field magnet (12) is fixed and the stator armature (14 ') is disposed at a fixed position facing the field magnet (12) and the gap (13). 2. The field magnet 12 is fixed to the position of the stator armature 14 disposed at the fixed shaft position opposed to the stator arm 14 through the axial air gap 13 at the position of the rotating fan 9 'facing the surface. Featuring a brushless fan motor. The brushless fan motor according to claim 2, wherein the brushless fan motor is a single-phase disc type brushless fan motor (1 '). The single-phase disc-shaped brushless fan motor 1 'according to any one of claims 1 to 3 has a field magnet 12 having a plurality of magnetic poles of N and S magnetized in the rotating fan 9'. Stator yokes 17 'and 17 "opposed to each other through the axial air gap 13, and at least one air-core armature fixed on the stator yoke and disposed in the stator armature 14' excretion of the fan motor. A brushless fan motor comprising: coils (18-1, 18-2) and an electric circuit for detecting magnetic poles of the field magnet (12) and for energizing and switching the armature coils. 5. The stator yokes 17 'and 17 "of the single-phase disc type brushless fan motor 1' are cutouts 33, 33-1 and 33- which the disc type brushless fan motor is capable of self-moving. 2, 33-3) formed brushless fan motor. 6. The disk-type brushless fan motor (1) according to claim 5, wherein the disc-shaped brushless fan motor (1) forms a printed circuit board (20) on the lower surfaces of the stator yokes (17 ', 17 ") and constitutes an electric current control circuit (36). 37) and the position detecting element 15 on the surface facing the cutouts 36 and 37 of the stator yoke of the printed circuit board or at the position opposite to the field magnet 12. Lease fan motor. The brushless fan motor according to claim 6, wherein the cutout portion (33) formed in the stator yoke (17 ') is formed to have the same width as the magnetic pole width of the field magnet (12). 8. The brush according to claim 7, wherein the cutouts (33-1, 33-2, 33-3) formed in the stator yoke (17 ') are formed at two or more positions separated from each other by an even number of magnetic poles. Lease fan motor. 9. The stator yoke 17 " according to claim 8, wherein the stator yoke 17 " rotates the field magnet 12 in a position where the end portion 33a of the cutouts 33-1, 33-2, 33-3 is obtained with the maximum torque. Brushless fan motor, characterized in that disposed in the front position by a half stimulus width toward.