KR900007271Y1 - Brushless 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 field magnets are integrally formed by magnetizing a plurality of N and S driving magnetic poles in a field magnet forming portion formed on the 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 an exemplary 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.

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: case of fan motor 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 storage 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: main axis number

30: inner ring 31: outer ring

32: steel ball 33, 33-1, 33-3, 34, 34 ': cutout

33a: end 35, 35 ': terminal

36, 37: electric parts 38: stay

The present invention is directed to a brushless fan motor which can be mass produced at low cost and therefore low parts.

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 have been widely used in recent years because of their high reliability in addition to the characteristics of DC motors such as greater torque and better controllability than shapes.

Disc type brushless motors (also called flat motors) having an axial gap structure with 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, a circuit (driving circuit: energization control circuit) for switching and energizing the magnetic field magnets N and S to the armature coil using a position detecting element such as a Hall element is required at a high cost. There is a drawback.

Therefore, it is not preferable to apply such an expensive brushless motor to a fan motor used for the purpose of cooling by blowing.

In order to solve this drawback, a single position (one-phase energized) brushless motor is used for a fan motor which has one position detecting element, and the energization switching circuit is also sufficient for only one phase.

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

1 is a plan view of a single-phase disc-type brushless fan motor, and FIG. 2 is a longitudinal cross-sectional view. 3 is a bottom view of the field magnet of the same motor, and FIG. 4 is a plan view of the stator armature of the same motor.

The single-phase disc-shaped brushless fan motor 1 includes a motor case 3 in the center of the planar square fan motor case 2, and a pin 4 described later on the outer peripheral bottom of the motor case 3. Perforations 5 through which the wind generated by the air is formed.

A bearing holder 6 is provided in the center of the motor case 3, and the rotating shaft 8 is supported by a rotating material by the bearing 7 formed in the inner circumference of the holder 6.

The rotary fan 9 is fixed to the top of the rotary shaft 8.

The rotary fan 9 integrally forms a pin 4 for blowing air in the outward direction, that is, the perforation 5 direction, on the outer circumference of the main body 10.

The rear surface of the rotating fan main body 10 is fixed in the order of the rotor yoke 11 and the field magnet 12, and the field magnet 12 is 2P (P is an integer of 2 or more in which the magnetic poles of N and S are alternated). For example, as shown in Fig. 3, a six-pole ring is used.

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

The single-phase disc-type brushless motor 16 is formed mainly from the rotor yoke 11, the field magnet 12, the stator armature 14, the position detecting element 15 and the like, which are mainly supported by the rotating material.

The stator armature 14 arranges the two concentric armature coils 18-1 and 18-2 in an in-phase position symmetrical by 180 degrees on the upper surface portion facing the field magnet 12 of the stator yoke 17. And position detecting elements 15, such as hall elements, and magnetic body projections 19 for magnetoresistance generation, and a printed circuit board 20 is disposed on the lower surface of the stator yoke 17, and the lower surface of the substrate 20 An electric component storage space 21 for forming an energization control circuit (not shown) is formed.

The armature coils 18-1 and 18-2 field open the conductor portions 18a and 18'a to contribute to the radially generated torque in order to be a single-phase disk type brushless motor 16 having good efficiency. The magnet 12 is formed in a concentric shape of a magnetic pole width, that is, a width of 60 degrees.

The magnetic body projection 19 for magnetoresistive torque generation formed on the upper surface of the stator yoke 17 has a field magnet 12 at one armature coil, that is, one effective conductor portion 18'a of the armature coil 18-2. In the direction of rotation (arrow A direction), the center of which is equal to the width of the single magnetic pole (60 degrees in the machine angle) at a position outside the electrical angle of 90 degrees (the magnetic angle, or 45 degrees in the machine angle). Doing.

The position detecting element 15 is arranged in an 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 is capable of self-moving, the field magnet 12 can be formed to be useful as it can be rotated in the direction of arrow A.

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

Therefore, it has a dead point.

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, even if the motor 1 is energized, starting torque cannot be obtained and is suitable for practical use. It is not good.

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 magnetoresistance torque indicated by the magnetoresistance torque curve 26 is generated by the suction force between the projection 19 and the field magnet 12, so as to be the size of one half of the generated torque curve 24. It is preferable.

The combined torque of the curves 24 and 26 is 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, projections 19 must be formed on the upper surface of the stator yoke 17, so there are disadvantages such as an increase in the unit cost of the parts and the number of assembly operations.

In addition, the cutout portion 23 is formed in the stator yoke 17, and the electric component disposed on the printed board 20 on the lower surface of the stator yoke 17 through the cutout portion 23 and the armature on the stator yoke 17. It is necessary to electrically connect the coils 18-1 and 18-2, and if the insulation measures of the stator yoke 17 are not sufficiently taken, there is a possibility that they may be shorted and structurally complicated, which is not suitable for mass production. .

In addition, in the single-phase disk-type brushless fan motor (1) or other fan motors designed to constitute the low cost, the rotor yoke (11) and the field magnet (12) by positioning adjustment to the rotating fan (9) It must be fixed.

In addition, an expensive metal rotating shaft 8 must be used to support the rotating fan 9 as a rotating material. In addition, since the rotating shaft 8 must be positioned and fixed to the rotating fan 9 to an extent, It is complicated in structure and is not suitable for mass-producing the fan motor 1 at low cost.

As described above, in order to make the brushless fan motor inexpensive, even if the single-phase brushless motor is adopted, the assembly of the expensive field magnet 12 and the rotating shaft 8 does not disappear, and the rotor yoke 11 and the field magnet ( 12) and the assembly of the rotary shaft 8 could not be simplified, so that an inexpensive single-phase disc type brushless fan motor could not be obtained.

In addition, since the field magnet 12 and the metal rotating shaft 8 other than plastic or rubber magnets are used, the rotating fan 9 cannot be formed at low cost again in terms of weight reduction.

The present invention is to solve the drawbacks of the conventional fan motor, to facilitate the installation of the rotor yoke, field magnet and the rotating shaft, or to form a rotating fan having a field magnet and the rotating shaft at a low cost, light weight The object of the present invention is to provide a self-operating single-phase disc type fan motor which is easy to assemble and incorporates an energization control circuit, and is improved in terms of manufacturing cost, reliability, and weight reduction. In a fan motor having a rotating fan having a fan for blowing air, the rotating fan is integrally formed with a plastic magnet, and the rotor yoke is integrated therebetween, and the face of the rotating fan faces through the air with the stator armature. A magnet is formed by forming a plurality of magnetic poles of N and S at the same time, and at the same time, the rotating shaft is formed of a plastic magnet. To provide a brushless fan motor using a rotating fan, FIG. 5 is a plastic magnet to be used for the single-phase disc-shaped brushless fan motor 1 'of the present invention. 7 is a perspective view of the rotor yoke mold-molded by a plastic magnet on the inner surface of the rotating fan 9 'of FIG. 6, and FIG. 8 is a A perspective view of the rotating fan 9 'in which the magnets for driving N and S are magnetized in the field magnet forming portion 28 of the rotating fan to form the field magnet 12' integrally, and FIG. 9 is a rotating fan of FIG. 9 ') is a perspective view when two inner rings are fixed to the rotating shaft 8', FIG. 10 is a fixed side perspective view of an example single phase disc type brushless fan motor 1 'of the present invention, and FIG. 11 is a single phase disc type brush 12 and 12 are top views of the stator armature 14 '.

Hereinafter, the present invention will be described in detail with reference to the drawings.

That is, the rotating fan 9 'is a pin 4' for blowing air in the axial direction on the outer circumference of the cap-shaped rotating fan main body 10 'which is formed flat in the axial direction by injection molding of the plastic magnet, and the rotating fan body. A position of the rotating shaft 10 'facing the stator armature 14' through the axial gap of the rotating shaft main body 10 'and the rotating shaft 8' directed to the lower portion of the core 10 'in the axial direction. An annular rotor yoke 11 as shown in FIG. 7, which is disposed at a predetermined position in advance at the time of injection molding of the plastic magnet in a position opposed to the field magnet 12 described later, and is integrated with a plastic magnet mold; It may also be a field magnet forming portion 28 which is formed by injection molding of a plastic magnet on the lower surface of the rotor yoke 11 and integrated with a plastic magnet mold.

Moreover, since the rotating shaft 8 'is integrally formed with the rotating fan main body 10' with a plastic magnet, the sintered metal like oilless bearing is not suitable as the bearing, and it is suitable to use a ball bearing as the bearing.

Therefore, in this case, as described later, it is preferable to fix the inner ring 30 of the shaft to the rotation shaft 8 'and to rotate the rotation shaft 8' and the inner ring 30 fixed thereto integrally.

In this case, the rotor yoke 11 may be integrated into the rotating fan main body 10 'by mold means as shown on the lower surface of the rotating fan main body 10'. In this embodiment, the rotating fan 9 'is rotated. In order to prevent the rotor yoke 11 and the field magnet 12 fixed thereto from escaping from the rotating fan 9 ', the rotor yoke 11 has a rotating fan body 10 as shown in FIG. It is molded and integrated by a plastic magnet so as to be located inside ').

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

Moreover, since the rotating shaft 8 'is integrally formed with the rotating fan main body 10' by a plastic magnet, the sintered metal like oilless metal bearing is unsuitable as the bearing, and it is suitable to use a ball bearing 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 'which will be described later, and to rotate the rotating shaft 8' and the inner ring 30 fixed thereto.

The single-phase disc-type 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 by rotating at the outer peripheral bottom of the motor case 3. A perforation 5 is formed to allow the wind generated by 4 'to pass through.

38 is a stay for connecting the fan motor case (2) and the motor case (3).

A bearing holder 6 is provided at the center of the motor case 3, and the upper and lower ends of the inner circumference of the bearing holder 6 have ball bearings 29'-1, as shown in Figs. 29'-2) is mounted, 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 a steel ball 32 is provided between the inner ring 30 and the outer ring 31. As shown in FIG. Has built in.

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

The rotary fan 9 'is multi-pole magnetized to the field magnet forming portion 28 formed on the inner surface of the main body 10' to form a six-pole toroidal field magnet 12 as shown in FIG. (See Figure 8).

That is, the field magnet 12 'is integrally formed on the rear surface of the rotating fan main body 10' via the rotor yoke.

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 alternated. For example, 6 poles are used as shown in FIG. It is not limited to.

A stator armature 14 'is formed in the field magnet 12 through an axial gap 13, and the field magnet 12, the stator armature 14' and the position detecting element (mainly supported by the rotating material) are formed. 15) etc., the single-phase disc-shaped brushless motor is formed.

The stator armature 14 'is a 180-degree symmetrical statue of two concentric armature coils 18-1 and 18-2 in an upper surface portion facing the field magnet 12' of the stator yoke 17 '. Excreted on location.

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'.

Accordingly, 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 'is not simply a cutout portion, but generates a magnetoresistive torque so that the brushless fan motor 1' can be moved automatically. The ideal synthesized torque curve 27 shown at 5 degrees 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 ( It is an integer smaller than the number of poles of 12).

In this embodiment, the cutout 33 is formed with a width equal to the width of one pole of the field magnet 12, that is, a width of 60 degrees using the field magnet 12 of six poles.

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

In this way, the radial length of the cutout portion 33 is formed to be about one-half the length of the radius of the stator yoke 17 '.

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

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

In this embodiment, the end 33a is positioned at a quarter pole, that is, 15 degrees ahead from the effective conductor portion 18'a of the armature coil 18-1 toward the rotation direction (arrow A direction). The stator yoke 17 'is provided so that it may be.

Small cutouts 34 and 34 'are formed in the outer circumferential portion at the position opposite to the cutout 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 with the electric component 36 for driving circuit formation arrange | positioned at the back surface of the printed circuit board 20 through the printing pattern for power distribution which is not shown in figure.

According to the single-phase disk-type brushless fan motor 1 'having such a configuration, the end portion 33a of the cut-out portion 33 is attracted to the center of the N pole or the S pole of the field magnet 12 at the time of stopping, In addition, since the position detecting element 15 always detects the N pole or the S pole, even if only one position detecting element can be moved, the magnet magnet 12 can be rotated in the direction of arrow A. have.

In the printed board 20 facing the cutout 33, a high electrical component 37 or the like can be disposed on the position detecting element 15.

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

In this way, for example, the N pole of the field magnet 12 completely overlaps one cutout.

Therefore, the suction force is balanced, no radial load is generated, less friction, and longer life span.

The present invention has no convoluted assembly work while balancing the rotating fan and rotor yoke, field magnet and rotating shaft like the conventional brushless fan motor, and the rotating fan and rotor yoke, field magnet and rotating shaft Since the magnet is formed by integral molding of the plastic magnet and then magnetized to the magnet field forming portion, the magnet is not only inexpensive and easily mass-produced, but also can be formed lightly, and no projection is required to obtain the magnetoresistive torque. In addition, the position detecting element can be easily disposed and an electric short can be prevented.

In addition, since the cutout is formed at the same time as the stator yoke is removed, the cost is reduced and the integration is easy.

According to the single-phase disk-type 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 possible to arrange a large number of armature coils on the stator yoke, and high torque is also possible. .

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

Moreover, the rotating fan in the said Example was formed by rotating and sending wind in a radial direction, and you may form a radially blow-type brushless fan motor.

In addition, the present invention is naturally applied to a brushless fan motor, a cam type structure and a iron core structure.

In addition, a brushless fan motor using a six-pole field is shown as a field magnet. However, the number of other poles is not limited thereto, and the armature coils need not be limited to two, but may be one or more.

Claims (12)

In a fan motor having a rotating fan having a pin for blowing wind by rotating, the rotating fan 9 'is provided with a rotor yoke 11 at a position opposite to the field magnet 12 and integrally formed with a plastic magnet. In addition, the magnetic field magnet 12 having a plurality of magnetic poles of N and S is formed on the opposite surface through the stator armature 14 'and the air gap 13 of the rotating fan, and at the same time, the rotary shaft 8' also has a plastic magnet. Brushless fan motor, characterized in that formed integrally with. 2. The rotating fan 9 'is characterized in that the magnet magnet is formed on the surface opposite to the stator armature 14' of the rotating fan through the air gap 13 with a plastic magnet. Brushless fan motor. The field magnet (12) according to claim 1, wherein the magnetic field magnets (12) are provided with a plurality of magnetic poles of N and S at positions of the rotating fan (9 ') opposed to the stator armature (14') disposed at a fixed position opposed to each other through the gap (13). Brushless fan motor characterized in that the magnetized. 4. The field magnet (12) according to claim 3, wherein the field magnet (12) is formed by magnetizing at a position of the stator armature (14) disposed at a fixed shaft position facing through the axial gap (13) and a rotation fan (9 ') facing the surface. Brushless fan motor characterized in that. The brushless fan motor of claim 1, wherein the brushless fan motor is a single-phase brushless fan motor. The brushless fan motor according to claim 5, wherein the brushless fan motor is a single-phase disc type brushless fan motor (1 '). The disk-type brushless fan motor 1 'includes a field stator yoke 17', 17 "having a plurality of magnetic poles of N and S formed in a rotating fan 9 'and the stator. It is fixed on the yoke and detects the magnetic poles of the field magnets 12 and one or more concentric armature coils 18-1 and 18-2 disposed on the stator armature 14 'of the fan motor, and switches them to the armature coils. Brushless fan motor characterized by having an armature circuit for energizing. 8. The stator yokes 17 ', 17 "of the single-phase disc-shaped brushless fan motor 1' are cutouts 33, 33-1, 33 which the disc-shaped brushless fan motors can self-move. -2, 33-3), brushless fan motor characterized in that. 9. The disk-type brushless fan motor according to claim 8, wherein the disk-type brushless fan motor forms the printed circuit board 20 on the lower surface of the stator yoke 17, 17 " The brushless fan motor characterized in that the position detecting element 15 is disposed on the surface facing the cutout portions 36, 37 of the stator yoke of the printed circuit board or at the position opposite to the field magnet 12. . 10. The brushless fan motor according to claim 9, 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). 12. The brush according to claim 10, wherein the cutouts 33-1, 33-2, 33-3 formed on the stator yoke 17 'are formed at two or more positions separated by even-numbered magnetic pole widths. Lease fan motor. 12. The stator yoke 17 "rotates the magnet magnet 12 at a position at which the end 33a of the cutouts 33-1, 33-2, 33-3 obtains the maximum starting torque. Brushless fan motor, characterized in that it is disposed in the position as far as half the width of the magnetic pole in the direction.