KR900003887Y1 - Brushless motor - Google Patents

Abstract

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Description

Single-phase, energized disc type brushless motor

1 is a longitudinal sectional view of a conventional single-phase disc-type axial brushless fan motor.

2 is a perspective view of a square case for the disc-shaped axial brushless fan motor of FIG.

3 is a plan view of the stator armature of the brushless fan motor of FIG.

4 is a perspective view of a cap body with a fan of FIG.

5 is a bottom view of a four-pole field magnet using the fan motor of FIG.

6 is an exploded view of the stator armature and field magnet of FIG.

7 is a longitudinal cross-sectional view of the disc-type axial brushless fan motor in which a one-phase energized embodiment of the present invention is applied.

8 is a plan view of the stator armature used in the fan motor of FIG.

9 is a cross-sectional view of the field magnet used for the fan motor of FIG.

10 is a longitudinal cross-sectional view of the motor casing.

FIG. 11 is a longitudinal sectional view in which the printed circuit board and the stator yoke are disposed in FIG. 10 and the stator armature is disposed on the inner surface of the motor casing.

FIG. 12 is a longitudinal sectional view in the case of FIG. 11 in which the projection part is removed and the stator armature is fixed to the inner surface of the motor casing.

13 is a longitudinal sectional view of the motor casing in which the stator armature of the second embodiment of the present invention is fixed.

14 is a longitudinal sectional view of the coater casing in which the stator armature of the third embodiment of the present invention is fixed.

15 is an explanatory diagram of a magnetic substrate.

16 is a longitudinal sectional view of the motor casing in which the stator armature of the fourth embodiment of the present invention is fixed.

* Explanation of symbols for main parts of the drawings

FM, FM ': Disc Type Axial Brushless Fan Motor

1,1 ': motor casing

2: square case for disc type brushless fan motor

3: through-hole 4: bearing

5: axis of rotation 6: stay

7: Part 8-1: Prus Power Cord

8-2: negative power cord 9: stator yoke

9 ': printed circuit board 10: printed circuit board

10 ': stator yoke 11: screw

12-1,12-2: Armature coil 13: Stator armature

14: cap body with fan 15: fan

16: rotor yoke 17: field magnet (magnet rotor)

18: rotating conversion element 19-1, 19-2: screw

22: driving circuit IC 33-1, 33-2: iron bar

34-1,34-2: projection 35: magnetic substrate

36: magnetic plate 37: insulating layer

38: power distribution pattern 39: chip components

The present invention relates to a disk-type brushless motor that is easily energized by one phase by assembling. The disk-less brushless motor, which is energized by one phase, is also usefully applied to a disk-type axial brushless fan motor for use in OA equipment. .

Disc-type brushless motors that are energized in one phase are extremely advantageous for use in disc-type axial brushless fan motors because they can be formed at low cost.

The brushless motor that is energized in one phase has an advantage of being expensive as one position detecting element.

As the position detecting element, a rotating element such as a Hall element, a Hall IC, or a position detecting coil is used.

When the rotation converter is used as the position detector, the rotational direction of the motor is determined, which is useful for a disk-type axial brushless fan motor that needs to rotate in a predetermined direction.

When the position detecting coil is used as the position detecting element, since the rotation direction of the motor is determined, it is useful when used in a disk-type axial brushless fan motor which may rotate in either the positive or the reverse direction.

In the following description, an example in which a magnetoelectric conversion element is used as the position detecting element will be described below.

In addition, the magnetoelectric conversion element is more expensive than the position detection coil at this time.

The disk-type brushless motor that is energized in one phase may have one expensive position detecting element as described above, but this must be taken in its own way.

In other words, the disc-shaped brushless motor in which the position sensing element is energized in one phase has the drawback that if the element detects the boundary between the N pole and the S pole of the field magnet, that is, the dead point, There is this.

Therefore, in a disk-type brushless motor that is energized in one phase, a magnetic bar is placed in the magnetic gap to generate a magnetoresistance (kogging), so that even with one position detecting element, the magnet of the field can always be started when stopped or started at the de-point point. It is an inexpensive and useful disk type brushless motor that can be moved and stopped.

Referring to an example of a disk-type axial brushless fan motor FM using such a conventional one-phase disk-type brushless motor, FIG. 1 shows one position detecting element, two coils, four poles, and one phase disk. It is a longitudinal cross-sectional view of a type | mold axial brushless motor (FM).

This disc-shaped brushless fan motor FM has a motor cap 1 of a cross-sectional cap shape at a plane angle as shown in FIG.

A disc-shaped brushless fan motor has a rectangular case 2, and the case 2 has a through hole 3 formed therein to allow the wind generated by the rotation of the fan, which will be described later. The rotating shaft 5 is supported by the bearing 4 by the rotation material.

6 is a stay formed at the bottom of the case (2), 7 is formed between the casing (1) and the case (2) Buoy The fan mentioned later is accommodated in the part 7.

8-1 and 8-2 are positive power supply cords and negative power supply cords connected to an electric circuit in the motor FM and induced outside the motor FM through the stay 6.

The inner surface of the casing 1 is formed with a screw hole (not shown).

On the inner surface of the casing 1, an annular stator yoke 9 made of magnetic material is disposed, and a printed circuit board 10 is disposed thereon.

In the stator yoke 9 and the printed circuit board 10, perforations are formed at the same position, and a magnetic screw 11 formed thereafter is formed in the stator yoke 9 and the printed circuit board 10 such that its head protrudes. The stator yoke 9 and the printed circuit board 10 are fixed to the inner surface of the casing 1 by screwing into the screw holes formed in the casing 1 through one hole.

The position of this screw 11 is mentioned later.

On the upper surface of the printed circuit board 10, two armature coils 12 are symmetrically disposed 180 degrees as shown in FIG. 3, and the stator armatures (12-1, 12-2) are disposed by the two armature coils 12-1, 12-2. 13) is formed.

At the position facing the stator armature 13, a fan-shaped cap body 14 formed of plastic flat in the axial direction as in FIG. 4 is opposed.

15 is a fan integrally formed with the cap body 14 at the outer circumferential portion of the cap body 14 with a fan.

The boss part 32 is integrally formed in the inner surface of the cap body 14, and generally the center part, and the upper end part of the rotation shaft 5 is fixed to this boss part 32, and it rotates integrally. An annular rotor yoke 16 is fixed to the inner surface portion of the cap body 14.

On the lower surface of the rotor yoke 16, a pole-shaped four-pole field magnet (magnet rotor) 17 in which the magnetic poles of N and S are alternately mounted as shown in FIG. 5 is fixed to face the stator armature 13. Lost

On the side opposite to the field magnet of the printed circuit board 10, as shown in FIG. 3, each arm that contributes to the generated torque is wound around the conductor portion 12a, and the armature coil wound around as substantially as the magnetic pole width of the field magnet 17 12-1 and 12-2 are arranged symmetrically by 180 degrees so as not to overlap with each other as described above.

The driver circuit IC 22 is disposed outside the occupation positions of the two armature coils 12-1 and 12-2 of the printed board 10.

This drive circuit IC 22 is for one-phase power supply formed in the one having a size equal to or less than the thickness of the armature coils 12-1 and 12-2.

Further, since the conductor portion 12b in the circumferential direction of the armature coil 12 does not contribute to the generated torque, the field magnet 17 having a small radius as much as the width of the conductor portion 12b may be used.

In addition, since the field magnet 17 uses four poles, the armature coil 12 forms an angle of 90 degrees for the opening of the conductor portion 12a to contribute to the generated torque.

The magnetoelectric conversion element 18, such as a Hall element or a Hall IC, used as the position detecting element is more appropriately disposed on the conductor portion 12a that will contribute to the generated torque, but in this case, the thickness of the two element 18 is reduced. As it increases, the air cap between the field magnet 17 and the armature coil 12 increases, a large rotational torque cannot be obtained, it is very difficult to excrete, and it is not joined to mass production.

Therefore, the element 18 is disposed in the lower surface portion of the conductor portion 12a.

In order to do this, the magnetoelectric conversion element 18 forms a hole in the printed circuit board 10 to face the conductor portion 12a which will contribute to the generated torque of the armature coil 12, and is accommodated in this hole.

FIG. 1: shows the case of X-X 'line longitudinal cross-sectional view of FIG.

The screws 19-1 and 19-2 use ones having substantially the same shape and size as the areas facing the magnetic poles of predetermined N and S of the field magnet (magnet rotor) 17 when the motor is stopped. have.

By forming such screws 19-1 and 19-2, the field magnet 17 can be rotated in a rotational direction rather than a position opposite to the conductor portion 12a which will contribute to the generated torque of the armature coils 12-1 and 12-2. 4 poles (in this embodiment, the four-pole field magnet 17 is always positioned at the time of stopping or starting up).

That is, as described above, the screws 19-1 and 19-2 are formed at the position before the quarter magnetic pole in the conductor portion 12a which will contribute to the generated torque of the armature coils 12-1 and 12-2. (See Figure 3).

The magnetic screws 19-1 and 19-2 are formed at the positions described above, and when the screws 19-1 and 19-2 are present, the magnet 17 sucks the N pole and the S pole at the center. Opposite this field magnet 17 is stopped.

Accordingly, the magnetoelectric conversion element 18 always detects the N pole or the S pole of the field magnet 17, that is, does not detect the dead point (does not oppose the dead point), so that the magnetoelectric coil 12 has 12- When the predetermined direction current of 1 or 12-2 is energized, the rotor having the field magnet can be rotated in the predetermined direction.

The formation of the screws 19-1 and 19-2 made of the magnetic material is inherently a cause of undesirable magnetoresistance, but in the disk-type axial brushless fan motor FM, the screws 19-1 , 19-2) is effectively used to rotate continuously.

Therefore, since only one position detecting element is sufficient, an inexpensive one-phase energized disc type brushless motor or disc type axial brushless fan motor FM is obtained.

The screws 19-1 and 19-2 may be formed in the portions 20 and 21 surrounded by the dotted lines with reference to FIG. 3, of course.

In addition, if the number of screws 19 is one or more, the objective is generally satisfied, but the number may be selected according to an appropriate specification and the position may be arbitrarily selected.

6 is a development view of the field magnet 17 and the stator armature 13 in a four-pole, two-coil, one-phase reciprocating brushless (fan) motor.

The conductor parts 12a and 12a to contribute to the generated torque of the armature coils 12-1 and 12-2 are arranged at equal intervals of 180 degrees at each electric angle.

The other terminal of the conductor portion 12a, which will contribute to the generated torque of the armature coil 12-1, and the one terminal of the conductor portion 12a, which will contribute to the generated torque of the armature coil 12-2 are connected in common, and the armature coil ( One terminal of the conductor portion 12a, which will contribute to the generated torque of 12-1), is connected to the connection point 25 between the collector of the transistor 23 of the driving circuit IC 22 and the collector of the transistor 24, The other terminal of the conductor portion 12a, which will contribute to the generated torque of the armature coil 12-2, is connected to the connection point 28 between the collector of the transistor 26 and the collector of the transistor 27.

The driving circuit IC 22 is formed of a single-phase reciprocating energization control circuit.

Emitters of transistors 23 and 26 are connected to positive power supply terminals 29, respectively, and emitters of transistors 24 and 27 are connected to ground 30, respectively.

The output terminal 31-1 of the magnetoelectric conversion element 18 is on the base side of the transistors 23, 27 constituting the driving circuit IC 22, and the output terminal 31-2 is the base of the transistors 24, 26. It is connected to the side.

Therefore, when the magnetoelectric conversion element 18 detects the N pole of the field magnet 17 (state of FIG. 6), the transistors 23 and 27 are conducted through the output terminal 31-1, and the armature coil 12- 1, 12-2) flows a current in the direction of arrow B to obtain a rotational force in the direction of arrow A.

When the S pole of the field magnet 17 is detected, the transistors 24 and 26 conduct through the output terminal 31-2, and currents in the opposite directions flow through the armature coils 12-1 and 12-2. The rotational force in the direction of arrow A can be obtained.

The screws 19-1 and 19-2 also function to fix the printed circuit board 10 and the stator yoke 9 to the casing 1 in addition to generating magnetoresistive torque.

The disk-type axial brushless fan motor FM that is supplied with the single phase is certainly inexpensive and is useful because of its ultra-light weight and thinness.

However, according to the fan motor FM, the screws 19-1 and 19-2 for generating the magnetoresistance are used, and the magnitude of the magnetoresistive torque differs depending on the desorption and desorption, and the fan motor FM It will have a big impact on the quality characteristics of.

In addition, since the printed circuit board 10 and the stator yoke 9 are fixed to the casing 1 by one or two screws 19-1 and 19-2, it is impossible to securely and firmly secure them. The screws 19-1 and 19-2 may be loosened by the screw.

Therefore, the present invention aims to obtain a one-phase energized disk-type brushless motor which is easy to assemble and can always generate a constant magnetoresistive torque, and can reliably fix the stator armature to the motor casing. It is an object of the present invention to provide a one-phase energized disk-type brushless motor that can be magnetized by using a magnetoresistive torque, in which at least one protrusion is integrally formed on an inner surface thereof when the motor casing is formed of plastic. At the same time, the magnetoresistive torque generating iron bar is integrally formed to protrude in the plane to form an armature having a hole for inserting the protrusion and the iron rod, and the protrusion and the iron bar are inserted into the hole of the armature coil drop plate. The stator armature is installed on the inner surface of the motor casing, and the armature coil dropping plate is turned on the upper surface. By heat-welding to the front end of the projection to secure the armature's radar as distorted trim on the inner surface of the motor casing can achieve the purpose.

In addition, description is abbreviate | omitted in the place common with the said conventional one-phase energized disk type axial brushless fan motor FM.

7 is a longitudinal cross-sectional view of a one-phase energized disk-type axial brushless fan motor FM ', which the present invention designates as Example 1. FIG.

In the fan motor FM ', the stator armature 13 shown in FIG. 3 and the four-pole field magnet 17 shown in FIG. 5 may be used. The stator armature 13 shown in the figure and the six-pole field magnet 17 shown in Fig. 9 are used.

The armature coils 12-1 and 12-2 in FIG. 8 using the six-pole field magnet 17 are now fan-shaped coils formed with a 60 degree opening angle of the conductor portion 12a to contribute to the generated torque. It is.

In Fig. 8, reference numerals 33-1 and 33-2 denote iron bars, and 34-1 to 34-4 denote protrusions.

The iron bars 33-1 and 33-2 are provided in the conductor portion 12a which will contribute to the generated torque of the armature coils 12-1 and 12-2, so that the field magnet 17 faces the rotation direction (arrow A direction). In general, the purpose of having a position of two minutes up to one pole width (30 degrees) or at this position and in-phase position is achieved. However, in this embodiment, the rods 33-1, 33- 2) is set such that the conductor portion 12a, which will contribute to the generated torque of the armature coils 12-1 and 12-2, is positioned at the front of the magnetic pole width (15 degrees) for 4 minutes in the direction of rotation of the rotor. .

Alternatively, the iron bars 33-1 and 33-2 may be set at positions which are in phase with this position, for example, positions 35 and 36 enclosed by dotted lines.

Moreover, you may set the iron bar 33 so that it may be located in all the said positions.

You may arrange | position the iron bar 33 to one or more places of such a position.

In FIG. 8, the projections 34-1, 34-2, 34-3, 34-4 are formed in four places, but the number thereof stably fixes the stator armature 13 to the inner surface of the casing 1 '. Choose the number you can.

Moreover, the position of the projection part 34 is arbitrary.

A method of forming the iron bar 33 and the protrusion 34 and a method of fixing the stator armature 13 on the inner surface of the casing 1 'will be described.

As shown in FIG. 10, when the motor casing 1 'is formed by injection molding of plastic, the protrusions 34 are integrally formed on the inner surface of the motor casing 1' as shown in FIG. The resistance generating iron bar 33 is integrally planted so as to protrude to the inner surface of the motor casing 1 'at two places as shown in FIG. 8, and then the iron bar 33 and the synchronization part 34 are inserted to insert the iron bar 33 and the synchronization part 34. A stator yoke 10 'having a hole substantially coincident with the protrusion and a printed board 9' used as the armature coil dropping plate are prepared.

The stator yoke 10 'and the printed circuit board 9' are sequentially and through the iron bar 33 and the projection 34 through the perforations formed therein, and the casing 1 'of the casing 1' is shown in FIG. By installing on the inner surface, the stator armature 13 is installed on the inner surface of the casing 1 '.

On the upper surface of the printed board 9 ', armature coils 12-1, 12-2, magnetoelectric conversion elements 18, and driving circuit ICs 22 are provided as shown in FIG. As shown in FIG. 12, the stator armature 13 is fixed to the inner surface of the casing 1 ′ by thermal welding and crushing the tip of the protrusion 34.

In Example 2, the state of FIG. 12 omits the state yoke 10 'in FIG.

In Example 3, the magnetic substrate 35 is used as the armature coil dropping plate in FIG.

As shown in FIG. 15, the magnetic substrate 35 is formed with the insulating worms 37 on the upper and lower surfaces of the magnetic substrate 36, and the print distribution pattern 38 is formed on the surface by etching or the like.

As the magnetic plate 36, an iron plate is mainly used, and this magnetic substrate 35 is called an iron plate.

When the magnetic substrate 35 is used, large rotational torque is obtained by not increasing the air cap in the magnetic circuit of the fan motor FM 'by the thickness of the printed board 9'.

Armature coils 12-1 and 12-2 are disposed on the upper surface of the magnetic substrate 35, and these terminals are connected to the print distribution pattern 38 by soldering.

On the lower surface of the magnetic substrate 35, a chip component 39 as an electric component having a driving circuit is disposed, and the terminal of the chip component 39 is connected to the print distribution pattern 38 by soldering.

In this case, the chip component 39 may be disposed in the space where the upper armature coils 12-1, 12-2 and the magnetoelectric conversion element 18 of the magnetic substrate 35 are left.

In the fourth embodiment, unlike the first embodiment, the stator yoke 10 'is disposed on the upper surface of the printed board 9' and the armature coils 12-1, 12-2 are disposed on the upper surface of the stator yoke 10 '. ) And a rotating conversion element 18 is disposed.

In this case, the stator yoke 10 'is insulated from its upper surface.

In addition, on the lower surface of the print engine 9 'disposed on the lower surface of the stator yoke 10', a chip component 39 serving as an electric component for constituting the driving circuit is disposed.

As is apparent from the above, in the single-phase disc-type brushless motor of the present invention, protrusions and iron bars are formed in the motor casing in advance, so that the printed board or stator yoke or magnetic substrate can be fixed at a predetermined position. And the relationship between the armature coil and the armature coil can be made constant, and the magnetoresistive torque provided at the predetermined position can be generated.

In addition, the magnetic resistance screw is not used to generate the magnetoresistance torque and to fix the state armature, that is, the stator armature is positioned and fixed by the protrusion and the iron rod, so Without adjustment, it is possible not only to generate a more suitable magnetoresistive torque, but also extremely easy to position and fix the stator armature.

In addition, the stator armature can be fixed to the inner surface of the motor casing at low cost because the special member for fixing the stator armature is not required as in the case of fixing the stator armature to the inner surface of the casing.

In addition, the present invention can increase the number of protrusions, so that the stator armature can be reliably fixed to the inner surface of the motor casing without the need for expensive components.

In addition, by appropriately selecting the number of rods or their size, the magnetoresistive torque of a suitable size can be generated over conventional screws.

In addition, according to the present invention, since a certain specification is easily obtained as compared with the conventional one, a disc-type brushless motor and a disc-type axial brushless fan motor that are always supplied with a constant specification of a single phase without any special adjustment are easily provided. There is an effect that can be mass-produced at a low price.

Claims (9)

A rotor magnet is provided with a field magnet 17 formed by alternately forming 2P (P is an integer of 1 or more) having N and S magnetic poles, and the armature coils 12-1, 12- are face-to-face with this field magnet. In the disc-type brushless motor in which one-phase energization is performed by arranging 2) on the fixed side and using magnetic resistance torque, at least one or more protrusions are formed on the inner surface of the plastic-shaped motor casing 1 '. 34 and the armature coils 12-1 and 12-2 on the armature coil distribution plate having the projections and perforations for inserting the iron bars, and having the iron rods 33 for magnetoresistive torque generation protruding on the inner surface. ), Stator armature 13 is formed to install the stator armature 13 on the inner surface of the motor casing 1 ', and at the same time heat-welding the distal end portion of the projection, characterized in that the disc-shaped brushless motor. The one-phase energized disc-shaped brushless motor according to claim 1, wherein the armature coil drop plate is a printed board (9 '). The one-phase energized disc-type brushless motor according to claim 1, wherein the armature coil dropping plate is a stator yoke (10 ') insulated from the armature coil dropping surface. The armature coil excrement plate according to claim 1, wherein the armature coil excrement plate is a magnetic substrate (35) having an insulating layer (37) formed on the surface of the magnetic body plate (36) and a printed distribution pattern (38) formed on the surface thereof. Disc-type brushless motor. 3. The disk-like, one-phase energized disc according to claim 2, wherein a stator yoke (10 ') having a through hole for inserting the protrusion (34) and the iron bar (33) is coupled to the lower surface of the printed board (9'). Brushless motor. 4. The one-phase energized disc-type brushless motor according to claim 3, wherein a printed circuit board (9 ') having a chip component (39) formed thereon is formed on a lower surface of the stator yoke (10'). 5. The one-phase energized disk type brushless motor according to claim 4, wherein a chip component (39) is disposed on a lower surface of the magnetic substrate (35). 8. The field magnet (17) according to any one of the preceding claims, wherein the iron bars (33-1, 33-2) are provided at the conductor portion (12a) that will contribute to the generated torque of the armature coils (12-1, 12-2). Characterized in that the perforations and the armature coils (12-1, 12-2) by setting the position of the armature coils (12-1, 12-2) in the forward position or in phase with this position as much as 1/2 of the magnetic pole width toward the direction of rotation) Disc-type brushless motor. 9. The iron rods 33-1 and 33-2 are directed toward the direction of rotation of the field magnet 17 in the conductor portion 12a which will contribute to the generated torque of the armature coils 12-1 and 12-2. One-phase energized disc-shaped brushless, characterized in that the perforations and armature coils (12-1, 12-2) are set so as to be positioned in the forward position or the in-phase position by a quarter pole width. motor.