JP2003018814A - Compressed coreless oscillating motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized compressed coreless oscillating motor capable of preventing degradation in performance because of size reduction, which is caused by degradation in the basic characteristics of the motor due to reduction in the flux of a field magnet and reduction in a winding amount because of size reduction, and degradation of oscillation strength due to reduction in the eccentricity amount of an eccentric coil which generates oscillation, and attaining more size reduction. SOLUTION: The size of an opening for accommodating brushes 16 is reduced in order to avoid reduction in the area of the field magnet and reduction in flux caused by downsizing the motor and to increase the flux. The diameter of the opening is made closer to the outer periphery of a fixed bearing or a fixed shaft of a contracted housing and fitted to a bottom surface of the housing 2, a pair of the brushes 16 at the opening part are accommodated in an opening part of a hollow disc plate-shaped yoke 15, and high-density focusing of flux at a cavity is performed by a strong magnetic body yoke in order to increase the area. Full-pitching is performed to a conventional short- pitch coil. Oscillation is increased by twice by applying the weight for a high specific gravity non-magnetic body on the opposite side of the eccentric coil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small vibration motor and relates to a flat coreless vibration motor.

As a call signal of a mobile phone or a terminal device, there is a vibration call by this vibration motor in addition to a tone transmission by a buzzer.

[0003]

2. Description of the Related Art As a vibration motor, a small cylindrical type is provided with a weight for rotary vibration, and a flat type is an unbalanced one in which non-overlapping three coils are unevenly distributed on the same plane to generate rotary vibration. Using rotational vibration (Japanese Patent Publication No. 8-1097)
There is 2).

[0004]

The portable telephones and terminal devices have been downsized, and the vibration motors for call signals incorporated therein have been reduced in performance due to downsizing.
This is due to the reduction of the flux of the field magnet due to the miniaturization and the reduction of the basic characteristics of the motor due to the reduction of the winding dose, and the vibration due to the reduction of the eccentricity of the uneven distribution coil (the product of the coil mass and the center of gravity distance). With the decrease in strength, it is necessary to measure this improvement and further miniaturization.

[0005]

The present invention has been made to achieve the above object. Even if it is downsized, the inner diameter of the hollow disk magnet is made as small as possible in order to measure the increase in the flux of the field magnet, and the field magnet is attached to the bottom of the cup-shaped housing while avoiding the conventional accommodating of the brush in the hollow part. In order to increase the area and strengthen the vibration strength by minimizing its inner diameter by bringing it closer to the outer diameter of the fixed bearing or fixed shaft,
In the armature, the weight of the non-magnetic material of high specific gravity of copper-tungsten alloy having an eccentricity amount three times that of the uneven distribution coil is arranged at 120 °,
At 240 °, the arrangement of the eccentric coils of all the nodes in which the winding dose was increased in place of the conventional eccentric coil of short segments was measured.

Here, the disk-shaped commutator is mounted on the plane opposite to the surface facing the field magnet of the armature, and a hollow disk-shaped ferromagnetic yoke is arranged on the end bracket. We decided to house a brush that slidably contacts the hollow part.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings based on an embodiment. FIG. 1 (a) shows a sectional view of an embodiment of the present invention, in which a fixed bearing 3 is provided on the bottom surface of a cup-shaped housing 2. Is provided and the perforated field magnet 1 having a hole 22 close to the outer diameter is inserted and mounted on the bottom surface of the housing 2. FIG. 1B is a cross-sectional view taken along the line AA of FIG. 1A. The three magnets 5, 6 and 7 showing that the magnet 1 has four poles, the figure (c) shows the armature 4 and the side facing the four-pole perforated field magnet 1 are shown. The coil 5 in the center is distributed at 240 °.
The two sides have an average opening angle of 90 °, which is a full node with respect to the four-pole field pole, and the peripheral opening angle is 120 °, which are superposed on the left and right coils 6.7. FIG. 6D shows the opposite surface of the armature 4 facing the field magnet 1 and the average opening angle of each of the two sides of the left and right coils 6, 7 is 90 °.
Two of them are arranged at 240 °, and a 6-segment flat plate-like commutator 8 is attached to the central plane to make a three-phase connection.

240 ° of three unevenly distributed coils as shown in FIG.
A weight 9 of a non-magnetic material having a high specific gravity such as a copper-tungsten alloy is arranged at 120 ° on the opposite side of and is fixed to the shaft 10. The eccentric coil of the armature 4 and the disk-shaped space of the weight (transparent for clarifying the configuration) are filled with a resin mold, and the recess 11 of the space for the fixed bearing 3 is formed, and the periphery is integrated with 12 to form the armature 4. I am configuring. In the figure (e), a yoke 15 made of a ferromagnetic hollow disk such as an iron plate is arranged on the end bracket 13 with an insulating sheet 14 interposed therebetween.
A pair of brushes 16 and 17 having an opening angle of 0 ° are accommodated and the root thereof is fixed by a seat 14. The rotating shaft 10 of the armature 4 shown in FIGS.
The flat coreless vibration motor is completed by inserting the end bracket 13 into the housing 2 and receiving the tip of the rotary shaft 10 while sliding the brushes 16 and 17 onto the plate-like commutator 8 of the armature 4. .

FIG. 2 (a) is a sectional view of another embodiment of the present invention, in which the perforated field magnet 1 having the hole 22 close to the outer diameter of the fixed shaft 20 of the housing 2 is inserted into the housing 2. FIG. 2B, which is attached to the bottom surface, shows that the perforated field magnet 1 has 6 poles in the AA sectional view of FIG. 2A, and FIG. The three coils 5, 6, 7 showing the side facing the 6-pole perforated field magnet 1 are unevenly arranged at 240 °, and the average opening angle of the two sides of each coil is 60 °.
The opening angle around the pole is 80 ° in all sections, and 240 ° with 3 pieces.
The arrangement is taken.

In FIG. 3D, a non-magnetic weight 9 having a high specific gravity such as a copper-tungsten alloy is arranged at 120 ° on the opposite side of 240 ° of the unevenly distributed 3 coils, and a disc of 9 segments is provided on the flat portion. A commutator 8 having a circular shape is mounted and a shaft-integrated resin mold 19 including the peripheral portion 12 is formed to constitute an armature 4 that can rotate with respect to a fixed shaft 20.

In FIG. 1E, a yoke 15 of a hollow disk made of a ferromagnetic material such as an iron plate is arranged on the end bracket 13 via an insulating adhesive sheet 14, and a pair of brushes 16 and 17 facing each other at 180 ° are provided in a central opening 18. , The root of which is fixed by the sheet 14. The armature 4 shown in FIGS. (C) and (d) is inserted into the fixed shaft 20 of the housing 2, the end bracket 13 is fitted into the housing 2, and the brushes 16 and 17 are slid onto the plate-shaped commutator 8 of the armature 4. The flat coreless vibration motor is completed by contacting them.

FIG. 3 (a) is a sectional view of another embodiment of the present invention, in which the perforated field magnet 1 has a hole 22 in the center thereof and the outer diameter of the fixed shaft 21 fixed to the end bracket 13. It is a disk-shaped object having a hole close to it and is attached to the bottom surface of the housing 2. Figure (b) is a cross-sectional view taken along the line AA of Figure (a), showing that the perforated field magnet 1 has 6 poles, and Figure (c) is the armature 4.
, And the three coils 5, 6 and 7 showing the side facing the 6-pole field magnet 1 are eccentrically arranged at 240 °, the coil 5 is the central coil, and the coils 6 and 7 are the left and right coils. The average open angle of the two sides of each coil is 60 °, which is a full node for the 6 poles of the field, and the open angle of the periphery is 80 °. Therefore, as shown in FIG. Placed at ° 1
An electric machine in which a weight 9 is arranged at 20 °, a disc-shaped commutator 8 of 9 segments is mounted on a flat surface, and a bearing integrated resin mold 19 including a peripheral portion 12 is performed to rotate with respect to a fixed shaft 21. It constitutes the child 4.

In FIG. 1 (e), a yoke 15 of a hollow disk made of a ferromagnetic material such as an iron plate is arranged on the end bracket 13 via an insulating adhesive sheet 14, and a pair of brushes 16 and 17 facing each other at 180 ° are provided in a central opening 18. The root of the housing is fixed by the seat 14 and has the fixed shaft 21 at the center. The armature 4 shown in FIGS. (C) and (d) is inserted into the fixed shaft 21, and the fixed shaft 21 is inserted into the center hole 22 of the perforated field magnet fixed to the housing 2. The end bracket 13 is inserted into the housing 2. The flat coreless vibration motor is completed by sliding the fitting brushes 16 and 17 onto the plate-shaped commutator 8 of the armature 4.

FIG. 4A shows a conventional embodiment (Japanese Patent Publication No. 8-1).
0972) is a sectional view, and FIG. 4B shows a part of the end bracket 13 on the cutting plane BB of FIG. 4A. The 4-pole field magnet 1 has an opening 18 in the center, and Brush 1
There is a fixed bearing 23 in which the rotation 10 of the armature 4 is inserted, and the roots of the pair of brushes 16 and 17 are fixed by an insulating sheet 14. In the armature 4 facing the field magnet 1 shown in FIG. 3C, 6, 7 coils are arranged on the left and right sides of the central coil 5 of the unevenly distributed 3 coils, and each coil has an average opening angle of 2 sides. Is 50 ° and the polar angle is 90 ° for the 4 poles of the field, and the open angle of the periphery is narrow at 70 °, but the uneven distribution of 3 coils forms an angle of 210 °, and the flat commutator 8 is placed on the plane. (D) shows a surface facing the housing 2 on the opposite side. The angle of the unevenly distributed coil is 180 °
When the center of gravity is exceeded, the center of gravity distance approaches the center, and the amount of eccentricity is small. The vibration is weakened.
Indicated with a short angle of 0 °, an opening angle of the circumferential deviation of 60 °, and an angle of three unevenly distributed coils of 180 °. The short length coil becomes too small and the rotational vibration becomes weak, so there is a limit to miniaturization.

From the embodiment of the present invention shown in FIGS. 1, 2 and 3 and the conventional embodiment shown in FIG. 4, the area is reduced by reducing the outer diameter of the small magnet and the outer diameter of the field magnet. In order to avoid the reduction of the area, which is caused by the reduction of the flux, the present invention is shown in FIG. 4 as shown in the above-mentioned FIG. 1, FIG. 2, and FIG.
The diameter of the opening 18 is reduced so that it is mounted on the bottom surface of the housing by approaching the fixed bearing in the center and the fixed shaft, the pair of brushes in the opening is accommodated in the opening in the yoke of the hollow disk, and the flux is strong in the yoke. Enables high-density focusing with a magnetic material,
Next, for the unevenly distributed coils of the armature, in order to avoid a decrease in winding dose (length per turn x number of turns) that accompanies miniaturization, the conventional short-coil coils are fully reduced. Avoided deterioration of characteristics (flux x winding dose).
However, if the eccentric coil is fully noded, strong vibration cannot be obtained because the eccentricity decreases due to occupying 240 ° of the entire 360 ° of the armature. For this reason, a high-density non-magnetic weight is used at 120 °. Arranged, the armature has an eccentricity of 240 ° and 12
Eccentricity of 0 ° is equally balanced (eg 1
Since it is a 20 ° equally divided 3 coil), a weight having a specific gravity of 3 times the average of the coil is canceled by 1 time, but a vibration effect of 2 times in the case of only an unevenly distributed coil can be obtained, which is suitable for miniaturization.

[0016]

In the flat coreless vibration motor, it is necessary to increase the flux x winding dose, which is a basic characteristic of the motor, in order to avoid performance deterioration due to size reduction. Increase the surface area of the field magnet to increase the flux. Avoid the brush in the opening of the field magnet that houses the conventional brush, and reduce the opening. Close to the fixed bearing of the housing, the outer diameter of the fixed shaft. I made it and achieved it. The increase in winding dose was obtained by replacing the conventional short-coil coil with a full-coil coil. The vibration was strengthened by doubling the eccentricity of the conventional eccentric coil only by adding a weight of a non-magnetic material having a high specific gravity to the opposite side of the eccentric coil. This has made it possible to avoid further reductions in basic performance and vibration strength, and to achieve further miniaturization.

[Brief description of drawings]

FIG. 1A is a sectional view of an embodiment of the present invention. (B) AA sectional view showing a field magnet (C) Diagram of the facing surface of the armature and field magnet (D) Armature, opposite side view (E) Diagram of end bracket

FIG. 2 (a) is a sectional view of another embodiment of the present invention. (B) AA sectional view showing a field magnet (C) Diagram of the facing surface of the armature and field magnet (D) Armature, opposite side view (E) Diagram of end bracket

FIG. 3A is a sectional view of another embodiment of the present invention. (B) AA sectional view showing a field magnet (C) Diagram of the facing surface of the armature and field magnet (D) Armature, opposite side view (E) Diagram of end bracket

4A is a cross-sectional view of a conventional embodiment, FIG. 4B is a cross-sectional view taken along line BB showing a field magnet and an end bracket, FIG. 4C is a view of a surface facing a field magnet, and FIG. View of opposite side (unevenly distributed 210 ° 3 coil) (e) Armature, other example (unevenly distributed 180 ° 3 coil)

[Explanation of symbols]

1 Perforated Field Magnet 15 Yoke 2 Housing 16 Brush 3 Fixed Bearing 17 Brush 4 Armature 18 Opening 5 Central Coil 19 (Mold) Bearing 6 Left and Right Coil 20 Fixed Axis 7 Left and Right Coil 21 Fixed Axis 8 Commutator 22 Hole (Perforated Field magnet) 9 Weight 23 Fixed bearing (end bracket) 10 Rotating shaft 11 Recess 12 (mold) Outer periphery 13 End bracket 14 Sheet

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02K 23/58 H02K 23/58 ZF term (reference) 5D107 AA13 BB08 CC08 DD09 5H603 AA00 BB01 BB14 CA02 CA05 CB01 CC14 CC19 CD02 CD13 CE01 5H607 AA00 BB01 BB13 CC01 CC03 DD01 DD02 DD03 DD05 DD08 DD09 DD16 EE57 EE58 GG01 GG09 JJ01 5H613 AA00 AA03 BB04 BB14 GA03 PP05 5H623 AA00 BB06 GG12 GG17 GG23 GH10JJ06H01 JJ09H06 JJ06

Claims (5)

[Claims] 1. A bearing is fixed to the bottom surface of a cup-shaped housing, and a perforated field magnet having a hole having a diameter close to the outer diameter of the bearing is attached to the bottom surface of the housing, The armature, which faces the open surface and has a gap, inserts a shaft into the fixed bearing and rotates, arranges an eccentrically distributed coil at 240 ° on the entire circumference 360 °, and vibrates with rotation at 120 °. A weight that is a non-magnetic material having a high specific gravity is arranged, and a disc-shaped commutator is mounted on the plane opposite to the surface facing the perforated field magnet in the armature, the tip of the armature shaft. A hollow disk-shaped ferromagnetic yoke is arranged in the end bracket that receives the magnet, and a pair of brushes that slidably contact the commutator of the armature is housed in the hollow portion. The end bracket is attached to the cup-shaped housing. A flat coreless vibration motor that is fitted together. 2. A shaft is fixed to the bottom surface of the cup-shaped housing, and a perforated field magnet having a hole having a diameter close to the shaft is attached to the bottom surface of the housing, and the armature is a shaft integrated with a bearing. A flat coreless vibration motor that is designed to rotate around. 3. A cup-shaped housing according to claim 1, wherein the bottom surface of the cup-shaped housing is fitted with a perforated field magnet having a hole for inserting a shaft fixed to the end bracket, and the armature is a bearing integrated mold. A flat coreless vibration motor that rotates around a shaft fixed to the. 4. The perforated field magnet according to claim 1 has four poles,
Flat coreless vibration motor 5. The perforated field magnet according to claim 1 has 6 poles,
Flat coreless vibration motor