KR900003892Y1 - Brushless motor - Google Patents

Abstract

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Description

Single-phase, energized disc type brushless motor

1 and 2 are explanatory diagrams of a method of generating a conventional magnetoresistive torque in a coreless brushless motor which is energized in one phase.

3 is an explanatory diagram of a stop position in the case of FIG.

4 is an explanatory diagram of magnetoresistance torque near dead point in the case of FIG.

5 is a torque one-turn angle curve of the disk-type brushless motor energized in one phase of the present invention.

6 is a longitudinal sectional view of a disk-type brushless motor (fan) as Embodiment 1 applied to the present invention.

7 is a perspective view of the case of the fan motor of FIG.

FIG. 8 is a perspective view of a cap body with a fan of FIG. 6. FIG.

9 is a bottom view of the stator armature in the first embodiment of the present invention.

10 is a bottom view of a four-pole field magnet.

11 is an exploded view of the field magnet of FIG. 10 and the stator armature of FIG.

12 is a plan view of the stator armature of Embodiment 2 of the present invention.

13 is a bottom view of the six-pole field magnet.

14 is a longitudinal sectional view of the magnetic scab for generating magnetoresistance.

FIG. 15 is an exploded view of the stator armature of FIG. 12 and the field magnet of FIG.

* Explanation of symbols for main parts of the drawings

FM: Disc Type Brushless Fan Motor

11: square casing for disc type brushless fan motor

13: stimulation 24-1,24-2,24'-1,24'-2: armature coil

25: printed circuit board 26, 26 ': stator armature

28: cap body with fan 32,32 ': magnet rotor (field magnet)

33,33 ': Magnetic material for generating magnetoresistance

The present invention relates to a disk-type brushless motor in which the position detecting element is energized in one single phase.

In the past, with the appearance of various apparatuses, there is a need for a brushless motor and a divided disk type brushless motor applied thereto.

This disk-type brushless motor can also move as a disk-type brushless fan motor used in office equipment and the like, and it has come to demand that the device to be applied is extremely inexpensive, compact, lightweight, and flat.

Further satisfying this condition is a brushless motor in which one-phase current is supplied with one position detecting element. In addition, this motor is called a two-phase motor by the number of armature coils (for example, two or four), but it is precisely referred to as a one-phase motor by the method of energization.

However, such one-phase (single-phase) motors have a so-called "dead spot" in which torque becomes zero at energization switching points.

Therefore, when the rotor position at the time of starting the motor is sometimes at the dead point, there is a drawback that the position detecting element cannot be operated automatically if the position detecting element detects the boundary between the north pole and the south pole of the magnet rotor, that is, the deed point.

Therefore, in the 1-phase motor, in addition to the torque generated by the armature coil and the magnet rotor, by adding a torque (magnetic resistance torque) by the magnetic material for generating magnetoresistance (steel plate is used), the dead point can be eliminated and the magnetic operation can be performed. .

For example, a method of applying magnetoresistive torque in a coreless motor is shown in FIGS. 1 and 2.

1 and 2, 1 is a rotor yoke, 2 is a 6-pole magnet rotor (field magnet) with alternating magnetic poles of N and S, 3 is a concentric armature coil, 4 is an air gap, 5 is The stator yoke, 6 is a bar.

As a method of attaching a magnetoresistance in a coreless motor, a method of attaching an inclination to the air cap is known as shown in the first illustration, but this method has a drawback in that the efficiency decreases due to the increase in the air gap.

Therefore, in the 1-phase motor, in addition to the torque generated by the armature coil and the magnet rotor, by adding a torque (magnetic resistance torque) by the magnetic material for generating magnetoresistance (steel plate is used), the dead point can be eliminated and the magnetic operation can be performed. .

For example, a method of applying magnetoresistive torque in a coreless motor is shown in FIGS. 1 and 2.

In FIGS. 1 and 2, 1 is a rotor yoke, 2 is a six-pole magnet rotor (field magnet) with alternating magnetic poles of N and S, 3 is an air core type armature, 4 is an air gap, 5 is The stator yoke, 6 is a bar.

As a method of attaching a magnetoresistance in a coreless motor, a method of attaching an inclination to an air gap is known as in the first illustration, but this method has a drawback in that the efficiency decreases due to the increase in the air gap.

In addition, there is a method of inserting the iron rod 6 into a portion of the uniform air gap as shown in the second illustration.

In this method, since the magnetic flux 7 is generated as in the third illustration, the center of the N or S pole of the magnet rotor (hereinafter referred to as the field magnet) 2 and the iron bar 6 correspond to each other. Since the field magnet 2 stops, if the armature coil 3 is disposed at a position where rotation torque can be generated at such a stop position, a coreless motor capable of magnetically moving is obtained. However, if the thickness of the iron bar 6 is increased in order to increase the magnetoresistive torque in the method shown in FIG. 2, the magnetic flux 7 acts as shown in FIG. 4 near the dead point, thereby reducing the torque near the dead point. There is a drawback to the phenomenon.

The present invention has been made in accordance with the above circumstances, and is a coreless type single-phase disc-type brushless motor using magnetoresistive torque, which is sufficient by making the width (individual) of the magnetic body for generating magnetoresistance match the magnetic pole width of the field magnet. It is possible to obtain magnetoresistive torque with an ideal lock 1 rotation angle curve in size and at the same time, and to generate a magnetoresistive torque extremely smoothly even when using the magnetic plate for generating magnetoresistance so that the rotor can rotate smoothly. It is an object of the present invention to provide a disc-type brushless motor that is energized with low noise, and to provide a lower surface of the stator armature without the stator yoke being uniformly disposed as in the prior art. For easily discharging the energization control circuit It is achieved by providing a single-phase, energized disk-type brushless motor incorporating an energization control circuit.

Thus, the single-phase disc-type brushless motor for which the present invention is intended is a magnetic plate for generating magnetoresistance having a width substantially equal to the magnetic pole width of the field magnet on the printed circuit board of the stator armature having the armature coil disposed on the printed circuit board. The center line should be placed at a position separated by about three quarters of the magnetic pole width of the field magnet from the conductor portion where the center line will contribute to the generating torque of the armature coil, and the electrical parts for the energization control circuit will not face the magnetic plate for generating magnetoresistance. In a single-phase, energized disk-type brushless motor provided on a printed circuit board which is not provided (this motor is submitted a little earlier than the present filing date), the conductor part which will contribute to the generating torque of the magnetic plate for generating magnetoresistance and the armature coil This is achieved by forming in the semi-rotation direction of the rotor so as to reduce the area or / and the volume by name.

In order to obtain an ideal torque one-turn angular curve, it is necessary to obtain the combined torque curve 8 shown in FIG.

9 is the armature coil torque curve by the armature coil, 10 is the magnetoresistance torque curve by the magnetic body for generating magnetoresistance.

As in the armature coil torque curve 9 and the magnetoresistance torque curve 10, the magnetoresistive torque is preferably made to be one half the armature torque.

In this way, a synthetic torque curve 8 obtained by combining the armature coil torque, the magnetoresistance torque, etc., which is substantially the same in the entire rotation angle, can be obtained.

In order to obtain such an ideal synthetic torque curve 8, the size and position of the magnetoresistive magnetic body must be properly designed, but according to the present invention, the ideal synthetic torque curve 8 is obtained.

In addition, since the magnetoresistive torque curve 10 is substantially smoothly formed, the motor rotates smoothly.

First, an embodiment of a disc type brushless fan motor to which a disc type brushless motor of the present invention is applied will be described with reference to FIGS. 6 to 12.

In the first embodiment, the same principle can be used for one position detecting element, two coils, a four-pole one-phase disk-type brushless motor, and one coil.

Reference numeral 10 denotes a space portion of the motor casing, which uses the space portion 10 to assemble electrical components for the energization control circuit, to simplify the mass production process, and to provide a disk-type brushless motor or a disk having excellent performance at low cost. To achieve a brushless fan motor (FM).

The angular case 11 (see FIG. 7) for the cap-shaped disc-shaped brushless fan motor which is flat in the axial direction, for example, made of plastic has a cap-shaped motor casing 12 at the center thereof, and this casing 12 At the bottom of the column, struts 13 directed in two directions are formed integrally. The screw hole 14 is formed in the top part of this support | pillar 13.

In the central part of the motor casing 12, bearing bearing numbers 16 and 17 are formed in the upper and lower openings of the bearing housing 15, respectively.

By the shaft numbers 16 and 17, the rotating shaft 18 is rotatably held in the center of the disk-type brushless fan motor FM main body.

A lowering prevention E ring 19 is attached to the lower portion of the rotating shaft 18. Reference numeral 20 denotes a recess (see Article 7) between the case 11 and the casing 12, 21 denotes an air through hole formed at the bottom of the case 11, 22 denotes a stay, and 23-1 and 23-2 respectively. Plus power cord, minus power cord.

On the top of the support 13, as described later, a non-magnetic material is formed through a non-pore formed with the stator armature 26 having the two armature coils 24 disposed on the upper surface of the printed board 25 on the printed board 25. Screw 27 was screwed into the screw hole 14 formed in the top part of the support | pillar 13, and it fixedly installed.

On the printed circuit board 25, two armature coils 24-1 and 24-2 were disposed symmetrically by 180 degrees as shown in FIG. The stator armature 26 is formed by these two armature coils 24-1 and 24-2 and the printed circuit board 25.

On the upper surface portion of the stator armature 26, a fan-shaped cap body 28 formed of a flat plastic in the axial direction as shown in the eighth face is faced with the rotating material.

29 is a fan formed integrally with the cap body 28 on the outer circumference of the cap body 28 with a fan. The boss 30 is formed integrally at the center of the inner surface of the cap body 28, and the upper end of the rotating shaft 18 is fixed to the boss 30 so as to rotate integrally.

An annular rotor yoke 31 is fixed to the inner surface of the cap body 28, and an annular four-pole field in which the magnetic poles of N and S are alternated on the lower surface of the rotor yoke 31 as shown in FIG. The magnet 32 is fixedly mounted to face the stator armature 26.

On the surface opposite to the field magnet 32 of the printed circuit board 25, as shown in FIGS. 1 and 9, the opening of the conductor portion 24a and the conductor portion 24b to contribute to the generated torque is performed by the field magnet 32. The armature coils 24-1 and 24-2 wound in a fan shape are arranged in a symmetrical manner as described above so as not to overlap each other.

The lower surface of the printed circuit board 25 has a width substantially the same as the magnetic pole width of the field magnet 32, that is, the field magnet 32 has four poles. The armature coils 24-2 and 24-1 may be the centerline (see FIG. 9) which becomes the center of the magnetic body plate 33 for magnetic resistance generation.

Also contributes to one-way generating torque (may be both 24-1 and 24-2) .Adhesion such as the position of the conductor magnet 24b to be about three quarters of the magnetic field width 32, that is, about 67.5 degrees apart. To fix it.

In the magnetic plate 33 for magnetoresistance generation, perforations 34 for inserting the screws 27 are formed. The printed circuit board 25 of the stator armature 26 has the sixth illustration on the lower surface except for the part facing the magnetic body plate 33 for magnetoresistance generation and the part facing the armature coils 24-1 and 24-2. Similarly, electrical components 34 (transistor), 35 (resistance), etc. for the energization control circuit are disposed.

In addition, since the conductor portions 24c and 24d in the circumferential direction of the armature coils 24-1 and 24-2 do not contribute to the generated torque, the field magnet 32 having a smaller radius as the width of the conductor portion 24d is provided. ) May be used.

In addition, since the field magnet 32 uses four poles, the armature coils 24-1 and 24-2 form 90 degrees of opening angle between the conductor portion 24a and the conductor portion 24b to gear to the generated torque. have.

The Hall element used as the position detecting element and the position detecting element 36 such as the Hall IC are disposed on the lower surface of the conductor portion 24a which will contribute to the generated torque of the armature coil 24-1.

With reference to FIG. 9, two armature coils 24-1 and 24-2 are disposed symmetrically with each other in order to reduce rotational vibration, but all may be one.

The conductor part 24b which contributes to the generated torque of the armature coils 24-1 and 24-2 by disposing the magnetic body plate 33 for magnetoresistance at the position of the printed circuit board 25 of the stator armature 26 described above. In the position to be opposed to the direction of rotation (arrow A), approximately one quarter of the magnetic field width of the magnet 32 (in this embodiment, the magnetic field magnet 32 of 4 poles, which is 22.5 degrees) The field magnet 32 is always positioned at the time of stopping or starting, as shown in FIG. 9, for example.

That is, the magnetic plate for magnetic resistance generation 33 is formed at the position formed under the above conditions, and the magnetic pole plate 33 stops so that the N pole and the S pole of the field magnet 32 face each other. Therefore, since the position detecting element 36 always detects the N pole or the S pole of the field magnet 32, that is, does not detect the dead point (dead spot), the armature coil 24-1 or the armature coil 24-2. When a predetermined direction current is supplied to the rotor, the rotor having the field magnet 32 can be rotated in the predetermined direction.

The formation of the magnetic resistance plate 33 for magnetoresistance on the printed circuit board 25 causes magnetoresistance, but in the present invention, the magnetic resistance torque by the magnetic body plate 33 can be effectively used to continuously rotate. To make it work.

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

In addition, the magnetic plate 33 formed on the printed circuit board 25 allows the rotor to always move automatically, but the magnetic plate 33 has the area ratio of the N pole and the S pole of the magnet 32 in the field. To face the magnetic plate 33 so as to be the same, and the rotor is a position that can be magnetically moved.

Here, the magnetic plate 33 is formed to generate a magnetoresistive torque, so that a magnetically actuated disk type brushless motor or a disk type brushless fan motor can be obtained, but the magnetic plate 33 If the width indicated by the dotted line 46 is used, the magnetoresistive torque rises sharply and rapidly, so that the motor cannot rotate smoothly.

Therefore, in the present invention, as shown by the solid line 47, generation of the magnetic body plate 33 for magnetoresistance generation and the electric magnetic coil 24-1 located closer to the rotation direction (arrow A direction) of the rotor. It cuts out again so that the volume and area from one end 33a near the conductor part 24b which will contribute to torque to the other end 33b gradually decrease.

In this way, since the magnetoresistive torque gradually increases, and the maximum starting torque is obtained thereafter, by rotating the motor smoothly as a whole as compared with the conventional one, there is no generation of a large rotary sound by the conventional magnetoresistive torque.

11 is a developed view of the field magnet 32 and the stator armature 26 in a four-pole, two-coil, single-phase reciprocating brushless (fan) motor.

The conductor portions 24a and 24b to contribute to the generated torque of the armature coils 24-1 and 24-2 are arranged at equal intervals of 180 degrees (90 degrees for the machine angle in this embodiment), respectively. .

One terminal of the conductor portion 24a to contribute to the generated torque of the armature coil 24-1 and the other terminal of the conductor portion 24a to contribute to the generated torque of the armature coil 24-2 are commonly connected, and the armature coil 24 The other terminal of the conductor portion 24b which will contribute to the generated torque of -1) is connected to the connection point 39 of the collector of the transistor 37 and the emitter of the transistor 38 in the energization control circuit, and the electric coil 24 One terminal of the conductor portion 24a which will contribute to the generation torque of -2) is connected to the connection point 42 between the collector of the transistor 40 and the emitter of the transistor 41.

The energization control circuit is formed of one phase reciprocation energization control circuit.

Emitters of the transistors 37 and 41 are connected to the flask power supply terminal 43, respectively, and emitters of the transistors 38 and 41 are connected to the stop 44, respectively.

The output terminals 45-1, 45-2 of the position detection element 36 are connected to an energization control circuit. Therefore, when the position detecting element 36 detects the N pole of the field magnet 32, the position detecting element 36 conducts the transistors 37 and 41 through the output terminal 45-1, and thus the armature coils 24-1 and 24-2. The rotational force in the direction of arrow A can be obtained by flowing a current in the direction of the arrow.

When the position detecting element 36 detects the S pole of the field magnet 32, the transistor 38.41 is turned on through the output terminal 45-2, and the armature coils 24-1 and 24-2 are described above. Current in the opposite direction flows to obtain the rotational force in the direction of arrow A.

In addition, in the state shown in FIG. 11, the position of the field magnet 32 drawn by a solid line indicates the position where the maximum starting torque will occur, and the position of the field magnet 32 indicated by the dotted line indicates the position where the magnetoresistive torque will occur. Is displayed. As shown in Fig. 11, the magnetoresistive torque is generated at the position of the field magnet 32 indicated by the dotted line, and if the field magnet 32 is located at the position indicated by the solid line, the maximum starting torque is generated. At the same time, a disc-shaped brushless motor or a disc-type brushless fan motor (FM) that is lossless and has excellent performance and has a good performance is obtained.

A second embodiment of the present invention will be described with reference to FIGS. 12 to 14.

12 is a plan view of the stator armature 26 'when the six-pole toroidal field magnet 32' of FIG. 13 is used.

The armature coils 24'-1 and 24'-2 are fan-shaped in which the openings of the conductor portion 24'a and the conductor portion 24'b which contributed to the generated torque are formed at 60 degrees.

Each of these armature coils 24'-1 and 24'-2 is disposed on the printed circuit board 25 in symmetry with each other by 180 degrees.

The magnetic plate 33 'for magnetoresistance generation having an opening width of 60 degrees has a field magnet at the conductor portion 24'1b where the center line 50, which is the center thereof, contributes to the generation torque of the armature coil 24'-2. It is fixedly mounted on the upper surface of the printed circuit board 25 as shown in FIG. 12 so that it becomes the position of three quarter pole width of 32 ', that is, about 45 degrees apart.

The position detecting element 36 is a printed circuit board 25 at an intermediate position between the conductor portion 24'b of the armature coil 24'-1 and the conductor portion 24'a of the armature coil 24'-2. Excreted on the face.

In this embodiment, the magnetic body plate 33 'does not gradually reduce the area and volume from one end 33'a to the other end 33'b, as in the first embodiment, and as shown in FIG. As shown in the figure, the taper 48 is formed on the other end 33'b to reduce the volume of the end 33b 'and to generate the magnetoresistive torque slightly smoothly.

When the position detecting element 36 is disposed a at the position of the printed circuit board 25, the magnetic plate 33 is not present at the position facing the printed circuit board 25 facing the element 36. Since the magnetic plate 33 is not present at the position where the terminal of the terminal 36 faces the printed circuit board 25, the terminal of the element 36 is projected on the lower surface of the printed circuit board 25 so that the terminal is printed on the printed circuit board 25. Soldering can be removed from the bottom.

15 is an exploded view of the field magnet 32 'and the stator armature 26'.

A position detecting element 36 to be disposed at a portion of the armature coil 24'-1 opposite to the conductor portion 24'a, for example, at a portion facing the dotted line 49 It is arranged in the position of the printed circuit board 25 which opposes the part 51 enclosed by the dotted line used as an in-phase position (refer FIG. 12).

In the above example, a four-pole field magnet 32 or a six-pole field magnet 32 'and two armature coils 24-1, 24-2, 24'-1 and 24'-2 are used. Although an example is shown, one armature coil or more may be sufficient.

In the case where a six-pole field magnet 32 'is used, three armature coils may be disposed at equal intervals.

In the case where an eight-pole field magnet is used, four armature coils may be arranged at equal intervals. In addition, the field magnets are integrated in such a way that the magnetic poles of the N pole and the S pole are alternately formed. You may form with a disk-shaped magnet.

In addition, the shape of the armature coil is not limited to that of the above-described embodiment, for example, an air core type formed in a ring shape or the like in a plane may be used.

The same applies to the magnetic plate for magnetoresistance generation.

In addition, the shapes and positions of the field magnet, the armature coil and the magnetoresistance generating magnetic body can be appropriately designed without departing from the spirit of the present invention.

The present invention is a single-phase energization of one position detection element as described above, it is possible to obtain a disk-type brushless motor or a disk-type brushless fan motor with a variety of low-cost and excellent performance.

In addition, even if only one position detecting element is used, the stator yoke does not need to be uniformly provided on the lower surface of the stator armature, so that the energization control circuit can be easily located at the position of the printed circuit board without the magnetic body for generating magnetoresistance and the armature coil. Since it can be disposed, it is easy to mass-produce a low-cost, single-phase disc-type brushless motor incorporating a miniaturized energization control circuit or a disc-type brushless fan motor using the same.

In addition, the present invention has the effect that the magnetic plate for generating the magnetoresistive torque is formed so as to smoothly generate the magnetoresistive torque, so that it rotates smoothly and does not generate a more lethal loud rotating sound in the fan motor.

As described above, the present invention has a great effect in practical use.

Claims (3)

A magnet rotor 2 having 2P (P is an integer of 1 or more) alternating magnetic poles of the N pole and the S pole, and at least one air core type armature coil 3 formed to face the magnet rotor. And stator armature disposed on the printed board so as not to overlap with the other armature coils, one position detecting element, and a magnetic body for generating magnetic resistance having a width substantially equal to the magnetic pole width of the magnet rotor. The magnetic resistance plate for magnetoresistance is fixedly installed at a position in which the center line is approximately three quarters of the magnetic pole width of the magnetic pole of the magnet rotor in the conductor portion that will contribute to the generated torque of the armature coil. In the case where the electrical component is disposed on the surface of the printed board not facing the magnetic plate, the magnetic plate for generating magnetoresistance is a conductor portion 24a which will contribute to the generated torque of the armature coil. Standing in a rotor of a half, depending on the rotation direction the disc name that is the first power application, characterized in that configured in the form which reduce the area and / or volume-type brushless motor. 2. The magnetism for generating magnetoresistance according to claim 1, wherein the magnetic body for generating magnetoresistance is provided at the other end portion 33 'at one end portion 33'a close to the conductor portion which will contribute to the generated torque of the armature coil to be located at a position closer to the direction of rotation of the rotor. A single-phase energized disk-type brushless motor, characterized in that it is formed to reduce the volume or / and area of the magnetic body for generating magnetoresistance up to b). The disk type brushless motor as claimed in claim 1 or 2, wherein a taper (48) is formed at an end portion (33'b) of a magnetic resistance generation plate (33 ').