JP3314160B2 - Eccentric commutator and manufacturing method of the commutator and flat coreless vibration motor using the commutator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eccentric commutator used as a silent call means of a mobile communication device and to an improvement in an assembly structure of a small vibration motor using the eccentric commutator.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 8, an eccentric weight W made of a tungsten alloy is arranged on an output shaft S of a cylindrical DC motor M as a silent call means for a pager, a portable telephone or the like. There is known an apparatus which generates vibration by utilizing a difference in centrifugal force of the vibration.

However, in the case where the eccentric weight W is added to the conventional output shaft S, there is a design limitation such that the turning space of the eccentric weight W must be taken into consideration on a device such as a pager. However, there is a problem in cost because an expensive tungsten alloy is used.

For this reason, the present applicant has previously disclosed a cylindrical coreless type vibration motor in which the output shaft is eliminated and the built-in rotor is eccentric, as disclosed in Japanese Patent Application No. 2-309070 (US Pat.
No. 155).

Since the motor has no output shaft and no eccentric weight, it has been well received in the market because it has no design restrictions, is easy to use, and has no danger during turning. Since it has three cylindrical coreless windings,
The problem that the number of parts and the number of processing steps increase is included.

In order to vibrate the rotor itself with an iron core type in place of the cylindrical coreless winding type, the applicant of the present invention has disclosed one of three salient pole type iron cores as disclosed in Japanese Patent Application No. 2-294482. Is proposed.

However, the two salient pole type iron core type as described above is suitable for a motor having a relatively large output with a large output, such as a massager, but is a portable device using a low voltage such as a portable terminal. Is not suitable because the center of gravity moves little and the amount of vibration is small.

Further, the present applicant has previously disclosed USP-53410
As disclosed in Japanese Patent No. 57, an eccentric armature core formed by facing a rotor in which three salient poles made of a magnetic material are all biased to one side on a four-pole field magnet magnetized by NS alternately. We propose a small vibration motor equipped with it. Furthermore, there is one disclosed in Japanese Patent Application Laid-Open No. 9-261918 as a disclosure of a similar technical idea. However, in such a motor, since the three armature cores made of a magnetic material are biased to one side, the cogging torque (the force attracted to the field magnet) is large, so that the air gap is relatively large. As a result, the diameter of the motor itself cannot be reduced.

[0009]

In the motor having the built-in eccentric rotor as described above, the distance between the armature windings is reduced as the size of the rotor is reduced, so that the terminal of the rotor is prevented from damaging the armature windings. Connecting to the commutator is a very difficult technique. In particular, when the printed wiring board is a flat commutator as it is, and the terminal of the armature winding is directly raised and soldered and connected, it separates from the printed pattern due to the elasticity of the terminal and is easily soldered. I couldn't do it.

A first object of the present invention is to provide a commutator with an eccentric member attached to the commutator so that the center of gravity can be moved by the commutator itself. So that there is no need to place That is, an object of the present invention is to provide an eccentric commutator that can be a vibration motor with a reduced number of parts. A second object of the present invention is to provide an eccentric commutator in which the strength of a commutator substrate having a specific shape is ensured. A third object of the present invention is to provide a configuration of an eccentric commutator that can easily connect each terminal by separating a terminal connection portion from an armature coil. A fourth object of the present invention is to allow the eccentric commutator to double as a bearing. A fifth object of the present invention is to provide a vibration motor having a small number of parts and thus being advantageous in cost by using such an eccentric commutator.

[0011]

According to the first aspect of the present invention , a through hole (T) is provided at the center as in the first aspect of the present invention.
And at least two air-core armature coils
A commutator substrate (1, 1) made of a printed wiring board having a mounting portion
A 11), the winding start of each air-core armature coils on the other surface with a plurality of commutator segments on one surface is formed,
The air-core armature coil is mounted for connection at the end of winding.
So that it does not come to the inside diameter of the coil
Terminal connection patterns (1a, 11a) are provided so as not to come out
The bearing holder is raised on the other surface at the position of the through hole (T) and slightly protrudes from the one surface.
And an air-core armature coil positioning guide outside the bearing portion.
Air core armature coil positioning guide
One surface of the core armature coil (3, 33) is
It is placed so that it is placed and the other surface is exposed, and is integrated with the resin body (2) partially including the metal body having the specific gravity of 3.5 or more. The part of the resin body included in the part is used as one of the eccentric means, and the resin body and the one
The part (1c) of the bearing part protruding from the surface of
This can be achieved by holding the sponge base material (1, 11) . A concrete means is the air-core electric machine as in the invention as set forth in claim 2.
Two child coils (33) are eccentrically arranged, and
Represents one surface passing between the air-core armature coils (33).
An arc-shaped second bank is protruded from an outer peripheral portion of the commutator.
Reinforce and hold each other so that base materials (1, 11) become diaphysis
You can achieve what you are doing . Also, the commutator base member as in the invention shown in claim 3 (1, 11) is formed in a non-circular when viewed from above, the commutator segments are slit non-normal direction
It can be achieved with what is formed. Further, the resin body has a dynamic friction coefficient of 0.4 (1.
5 kg / cm ² ) or less slidability, with a bearing hole in the center
It is preferable to provide a resin bearing portion . further,
As a method of manufacturing such an eccentric commutator , a through hole (T) is provided at the center as in the invention as set forth in claim 5, and a small number is provided.
Without even forming a two air-core commutator base material made of printed wiring board having an armature coil mounting portion (1, 11) one double <br/> several commutator segments on the surface of each air-core Beginning of armature coil winding
The air cored armature coil
So that it does not come to the inner diameter of the coil on the
The terminal connection pattern (1a, 11
Step a) is provided , and this commutator substrate is formed into a molding die.
A step of setting, the other bearing part at the position of the through hole (T)
Up on one side and stick it out slightly from the other side.
And a resin body partially including a metal body having a specific gravity of 3.5 or more
Can be used as part of the eccentric means.
Eccentrically and integrally forming;
At least two air-core armature coils are mounted on the
And fixing with resin, and the air-core armature coil
This can be achieved by wiring a terminal to the terminal connection pattern . To flat type vibration motor with such an eccentric commutator, the claims 1 as in the invention shown in claim 6, 7
Armature coil positioning arranged on the eccentric commutator according to Item 4.
Insert the air-core armature coil into the guide,
And fix the end of each air core armature coil
At least a part of the rectification so as not to go out of the rotor thickness
Air-core armature coil terminal lead-out groove provided in part of armature base
(1g) and connected to the connection terminal through the housing
Non-moulding that is rotatably mounted on a shaft fixed to a part of
5. An apparatus according to claim 1, further comprising:
The eccentric commutator according to claim 1, wherein the armature core
Using the air positioning armature coil
Attach the terminal of each air-core armature coil to the connection terminal
And the metal within the thickness of the air-core armature coil.
The eccentric rotor integrated with the resin
Of the housing and the tip protrudes from the housing.
Achievable by rotatably mounting on a shaft that is not

According to the means for achieving the object set forth in claim 1, since the center of gravity can be moved by the commutator itself, the eccentric rotor does not require another eccentric member on the output shaft . According to the means for achieving the object, a high-density tree formed by a commutator substrate is provided.
The strength of the fat body can be secured . Means for achieving the object set forth in claim 3
According to the eccentric rotor can be easily made, each brush
Prevents sparks when switching commutator segments
You. According to the means for achieving the object, there is no need for a special bearing. According to the means for achieving the object described in claim 5, the eccentric commutator can be manufactured in large quantities at low cost. According to the means for achieving the object set forth in claim 6, an air-core armature coil is provided.
Since it is not molded, disconnect the end of the air-core armature coil.
A flat type vibration motor that eliminates wire problems can be easily configured.
You. According to the means for achieving the object, an air-core armature is provided.
Make sure that the coil does not adhere to the eccentric commutator
Can be embodied.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below based on embodiments shown in the drawings. FIG. 1 is a plan view showing a first embodiment of the eccentric commutator of the present invention, FIG. 2 is a plan view of a flat coreless vibration motor using the eccentric commutator of FIG. 1, and FIG. FIG. 4 is a plan view showing an internal embodiment of the motor using an eccentric commutator according to a second embodiment of the present invention, and FIG. 5 is a third embodiment as a modification of FIG. FIG. 6 is a plan view showing an internal embodiment of the motor using the eccentric commutator of the embodiment, FIG. 6 is a vertical sectional view taken along line YX of FIG. 5, and FIG. FIG.

In FIG. 1, reference numeral 1 denotes an eccentric commutator base made of a printed wiring board .
It is formed in a fan shape (half-moon shape) that is provided with a large shaft insertion hole K and is expanded when viewed from a plane. This eccentric commutator substrate
1 on one side to prevent sparking.
9 commutator pieces 1s
On the other surface, the eccentric commutator substrate 1 is thinly covered with a high specific gravity high slidable resin body 2 having a specific gravity of 3.5 or more (preferably a specific gravity of 6) as a half-moon when viewed from a plane. The eccentric commutator S1 is integrally formed and forms a part of the eccentric commutator S1. Where
Since the high specific gravity and high slidability resin body 2 has a specific gravity of 3.5 or more,
However, it cannot be constituted only by resin but contains metal.
Of the commutator pieces 1s, three commutator pieces extending from the center of gravity side
And long protrudes from the bottom of the half-moon as the terminal connection terminal unit 1a. The eccentric commutator base material 1 is further cut into the inside of both ends 2a of a half-moon shape integrally formed on both surfaces of the base material 1 with a high specific gravity and high slidability resin body 2.
Is extended as a reinforcing portion 1b which does not come off in the axial direction . The commutator segments 1s # are short-circuited every two commutator segments 1s # from the principle of rotation using the back surface or the like via the front surface or through hole. A bearing hole is provided on one surface (the back surface in the figure) of the eccentric commutator substrate 1 .
1c is provided at the center, and the shaft insertion hole K
Through the shaft insertion hole in the other surface (the surface in the figure)
By integrally molding a bank 1d with a diameter larger than K,
The core commutator substrate 1 is held. Sand
A part of the shaft insertion hole K of the eccentric commutator substrate 1 is
To prevent the bearing from dropping in the axial direction by cutting into 1d
I keep it. Eccentric commutator substrate 1 thus configured
, The second bank portion 1e is Ru provided as a further eccentric emphasis on the outer peripheral portion of the half-moon in high density and high sliding resin body 2. This
The second bank 1e has an arc shape, and both ends are
As described above, the eccentric commutator substrate 1 is cut into the both ends 2a of the half-moon shape integrally formed on both surfaces to thereby achieve the same.
A reinforcing portion 1b is provided in the circumferential direction on both sides of the terminal connection terminal portion 1a so as to prevent the resin from coming off in the axial direction . The other surface of the eccentric commutator substrate 1 is further provided with an opening angle 160
As shown by a broken line on the back side of the nine commutator pieces 1s #, air-core armature coil positioning and fixing pieces 1f described later,
1f constitute an eccentric commutator S1 is integrally formed form at the high density and high sliding resin body 2. The specific gravity is 3.5 or more (this
In this case, the high specific gravity and high slidability resin body 2 preferably having a specific gravity of 6) is made of a metal powder bound with polyamide, and thus has a resistance of 9 kΩ.
Since it has a certain volume resistance, it is as if the resistance has entered between the commutator pieces, which is effective in preventing sparking.

Next, a first embodiment of a flat coreless vibration motor using the above-described eccentric commutator will be described with reference to FIGS. 2 and 3. The eccentric commutator S1 further includes an eccentric commutator substrate.
Air-core armature coils 3, 3 formed by winding self-fusing wires on the other surface of 1 are mounted by fitting into the air-core armature coil positioning and fixing pieces 1f, 1f to be integrated to start winding. , End the winding from within the thickness of the rotor
The eccentric rotor R1 is formed by winding around the air-core armature coil terminal connection terminal portion 1a through a predetermined groove 1g and soldering it by dipping. These sky
In order to increase the amount of eccentricity between the core armature coils 3, 3,
A high specific gravity slide having a specific gravity of 3.5 or more (preferably a specific gravity of 6)
Fill with the thickness of the air-core armature coil with the dynamic resin body 2
I have to. This part is the bearing part, the second bank part
The second bank has come off in the radial direction.
It is designed to prevent injuries. The means for fixing the air-core armature coils 3, 3 is preferably fixed by reflow using powder or solid epoxy. The one provided with such an eccentric rotor R <b> 1 is of an axial gap type and is driven by a flat magnet 4. Reference numeral 5 denotes a tin-plated steel plate bracket that holds the magnet 4 and serves as a magnetic path. The eccentric commutator S1 is rotatably mounted on a shaft J fixed to the center of the bracket 5 through a bearing hole 1c of the eccentric commutator S1, and a pair of brushes 7, 7 arranged on the bracket 5 is attached to the eccentric commutator S1. The armature coils 3 and 3 are supplied with electric power by sliding contact with the armature coils 3 and 4 at an opening angle of 180 °.

FIG. 4 shows a second embodiment of the eccentric commutator of the present invention, that is, reference numeral 11 denotes an eccentric commutator substrate formed of a printed wiring board, and a shaft as shown by an inner broken line at the center.
It is provided with a shaft insertion hole larger than the receiving hole 1c and is formed in a fan shape which is expanded when viewed from a plane. This eccentric commutator substrate 11
On one side, there is a diagonal slit for spark prevention
Six commutator pieces 1s # provided are arranged, and
On the other side, a high specific gravity and high slidable resin body 22 having a specific gravity of 3.5 or more (here, preferably a specific gravity of 6) as a half-moon type as viewed from a plane so as to enclose the eccentric commutator base material 11 thinly. The eccentric commutator S2 is formed by integrally forming the eccentric commutator S2. It is the same as the above that the armature coil terminal connection terminal portion 1a protrudes from the bottom of the half-moon shape from the three commutator pieces on the center of gravity side of the commutator pieces 11s . In the eccentric commutator substrate 11, the commutator pieces 11s # are short-circuited from each other on the principle of rotation using the front surface or the back surface via through holes. This eccentric commutator substrate 1 is a half-moon type molded integrally with both surfaces of the substrate 1 with a high specific gravity and high slidability resin body 22.
The resin is made into a shaft by digging into the inside of both ends 2a.
It extends as a reinforcing portion 1b so as not to come off in the direction . One surface of this eccentric commutator substrate 11 (back surface in the figure)
Is provided at the center with a bearing portion having a bearing hole 1c,
The other surface (the surface in the figure) through the shaft insertion hole
It is possible to integrally mold the bank 1d with a diameter larger than the shaft insertion hole K.
This allows the eccentric commutator substrate 11 to be held.
ing. That is, the portion of the shaft insertion hole of the eccentric commutator substrate 11
The part does not cut into the bank 1d and the bearing does not fall off
It has been reinforced. Such eccentric commutator base member 1 configured 1, the second bank portion 1e as further FIG 1 and eccentric emphasis on the outer peripheral portion of the half-moon in high density and high sliding resin body 2 2 similarly It provided Ru. The eccentric commutator substrate 11
The further arrangement opening angle 1 2 0 the six in-degree commutator segments 1
s ‥‥ air-core armature as indicated by a broken line in the back coil positioning fixing frame 1 1f, 1 1f is integrally molded with the high specific gravity and high sliding resin body 2 2, air-core armature coils 33, 33
Eccentric row consisting of eccentric commutator S2
Data R2 .

FIGS. 5 and 6 show the same vibration motor using the eccentric commutator of the third embodiment, which is a modification of the above-described FIG. The armature coil terminal connection terminal portion 11a is provided on the side opposite to the center of gravity opposite to the above-mentioned one. These armature coil terminal connection terminal portions 11a are further provided with notches a for latching. The position of the armature coil terminal connection terminal portion 1a does not overlap the air-core armature coils 33, 33 when viewed from a plane, so that terminal connection is facilitated. Other configurations are the same as those of the first and second embodiments, and therefore, the same reference numerals are given and explanations thereof are omitted. However, the brushes 8 and 8 have a sliding contact opening angle of 90 degrees and the magnet 44 has N and N S
The difference is that four poles are alternately magnetized.

As the resin having high specific gravity and high slidability, a resin having a specific gravity of 3.5 to 10 is selected from the viewpoint of a balance between high specific gravity and high slidability. When used for a motor, it is preferably a metal body.
It is preferable that the specific gravity containing the metal powder is about 6. Further, in order to shift the center of gravity and increase the weight, a heavy metal having a specific gravity of about 12 can be used. However, such a ratio
When the weight 12 is used , the amount of the metal powder increases,
Although the volume resistance is about 400Ω and the spark elimination property is improved, the slidability deteriorates, so the sliding oil is applied or partially impregnated so that the center bearing has a different oil content. It is preferable to use a united resin or a porous metal oil-impregnated bearing. The lower the volume resistance is, the greater the effect of extinguishing the spark is.
At 0 KΩ or more, the spark elimination effect tends to be weak. Although the above description has been made in the case of the star connection type, the delta connection can be achieved by changing the position of the brush or the position of the magnetic pole of the field magnet.

FIG. 7 is an explanatory view of a method of manufacturing the eccentric commutator of FIG. 5. The base material 111 of the eccentric commutator S3 is formed in ten rows and two rows via a connecting portion r #, and the injection molding metal is used as it is. It is set in a mold and integrally molded with the high-density, high-sliding resin having a specific gravity of 6 to form a group of connected eccentric commutators and cut off as they are, or use air-core armature coils 33, 33
After disposing the eccentric commutator, the eccentric commutator is separated from the eccentric rotor assembly. It is needless to say that such a manufacturing method can be used in the other embodiments described above.

[0020]

Since the eccentric commutator according to the present invention and the small vibration motor using the eccentric commutator are constructed as described above, the commutator itself can move the center of gravity, and each air-core armature coil can If a non-mold type is used for mounting , even if the armature coil is made of a thin wire, disconnection can be prevented, and since each armature coil is separated from the connection terminal, the terminal can be easily connected to the commutator. The child can be easily assembled.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of an eccentric commutator of the present invention.

FIG. 2 is a plan view of a flat coreless vibration motor using the eccentric commutator of FIG. 1;

FIG. 3 is a vertical sectional view taken along the line YX of the motor.

FIG. 4 is a plan view showing an internal embodiment of the motor using an eccentric commutator according to a second embodiment of the present invention.

FIG. 5 is a plan view showing an internal embodiment of the motor using an eccentric commutator of a third embodiment as a modification of FIG.

6 is a vertical sectional view taken along the line YX in FIG. 5;

FIG. 7 is a plan view for explaining a method of manufacturing the same eccentric commutator.

FIG. 8 is a perspective view of a conventional small vibration motor.

[Explanation of symbols]

1, 11, 111 Eccentric commutator base material 1s, 11s Commutator piece 1a, 11a Connection terminal 1c Bearing hole 1d Bank 1e Second bank 2,22 High-density high-sliding resin bodies S1, S2, S3 Eccentric commutator 3, 33 Air core armature coil 4, 44 Magnet 5 Bracket 6 Case 8 Brush J axis

Claims (7)

(57) [Claims] A through hole (T) is provided at the center and a small number of holes are provided.
A commutator substrate (1 , 11) comprising a printed wiring board having at least two air-core armature coil mounting portions ,
A plurality of commutator pieces are formed on one side and
Start and end of winding of each air core armature coil
The inner diameter of the coil on the air-core armature coil mounting surface
Terminal connection so that it does not come in
The pattern (1a, 11a) is provided, and when the bearing holder is raised at the position of the through hole (T) on the other surface,
The slightly protrude from one surface to the outer side of the bearing portion
An air core armature coil positioning guide is
Air core armature coils (3,
33) one surface is placed on the commutator substrate and the other surface
Are exposed so as to be integrated with a resin body (2) partially including the metal body having the specific gravity of 3.5 or more. It is used as a One
And at the same time the resin body and the
The commutator substrate (1, 11) is formed in a part (1c) of the bearing part.
Eccentric commutator that holds 2. The air-core armature coil (33) has two biases.
And the resin body is the air-core armature coil.
(33) An arc-shaped second soil is formed on the outer periphery of one surface passing through
The hand part is protruded and the commutator base material (1, 11) is
The eccentric commutator according to claim 1, wherein the eccentric commutators are reinforced and held together so that Wherein the commutator base (1, 11) is formed in a non-circular when viewed from above, the slits dividing the commutator segments
The eccentric commutator according to claim 1 , wherein the eccentric commutator is formed in a non-normal direction . 4. The resin body has a dynamic friction coefficient of 0.4 (1.5).
kg / cm ² ) or less, with a bearing hole at the center
The eccentric commutator according to claim 1, further comprising a resin bearing portion that performs the operation . 5. A through hole (T) is provided at the center and a small number of holes are provided.
Printing with at least two air-core armature coil mounting parts
One side of the commutator substrate (1, 11 ) composed of a wiring board
Form several commutator strips and start winding each air core armature coil
The air cored armature coil
So that it does not come to the inner diameter of the coil on the
The terminal connection pattern (1a, 11
Step a) is provided , and this commutator substrate is formed into a molding die.
A step of setting, the other bearing part at the position of the through hole (T)
Up on one side and stick it out slightly from the other side.
And a resin body partially including a metal body having a specific gravity of 3.5 or more
Can be used as part of the eccentric means.
Eccentrically and integrally forming;
At least two air-core armature coils are mounted on the
And fixing with resin, and the air-core armature coil
A method for manufacturing an eccentric commutator in which a terminal is wired in the terminal connection pattern . 6. An eccentric rectifier according to claim 1, wherein :
Armature coil positioning guide
Insert the secondary coil and fix it by means other than resin molding.
At least a part of the end of each air-core armature coil is
Provided on a part of the commutator base so as not to go out of the thickness of the
Through the air core armature coil terminal groove (1g)
A shaft connected to the connection terminal and fixed to a part of the housing
Equipped with a non-molded eccentric rotor rotatably mounted on
Flat coreless vibration motor. 7. An eccentric rectifier according to claim 1, wherein :
Armature coil positioning guide
The air-core armature coils are mounted using
Connect the terminal of the core armature coil to the connection terminal,
The resin body containing the metal body within the thickness of the air-core armature coil
Integrated eccentric rotor fixed to part of housing
And the tip does not protrude from the housing
Flat coreless vibration motor that is rotatably mounted on a shaft .