JPH1175355A - Structure of armature of flat motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rotate a motor surely and smoothly at its starting time, by providing permanent magnets having N and S poles in an armature, and constituting it so that the permanent magnets may be at the boundaries of the N and S magnetic poles of field magnets when the armature stops. SOLUTION: A permanent magnet 20 is provided by projecting laterally from one side edge of a resin frame. When a power to the coreless armature coil 12 of an armature 10 is cut off, after the armature 10 was rotated clockwise or counter-clockwise, the south and north poles of the permanent magnet 20 are attracted by the N and S poles of a field magnet 21, and stop with its longitudinal center on a boundary line 22 between the N and the S poles of the field magnet 21. Consequently, one side part 12a of the coreless armature coil 12 protrudes more to the S pole side than the inside of region Z of the field magnet 21 where it is considered difficult to start the armature 10, so the armature 10 rotates smoothly when it starts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armature structure of a flat motor applied to a device for transmitting vibrations to a human body, and more particularly to an armature constituted by one or a plurality of coreless armature coils. This is for a smooth restart.

[0002]

2. Description of the Related Art Devices for transmitting vibrations to the human body include a radio telephone calling device (hereinafter referred to as a pager), a cellular phone, a massage machine for giving a light vibration to the human body to exert a massage effect, and a signal for the visually impaired. Various types of receivers and the like are known, and include a flat motor in which an armature is eccentric.

As such a flat motor, for example, FIG.
1 and FIG. 12 are known (JP-A-6-205565). The vibration generator 1 includes a circular plate-shaped field magnet 3 fixed to the bottom of a casing 2, a rotatable armature 4 disposed to face the field magnet 3, and an armature 4. And a shaft 5 which is arranged in a slanting manner. The armature 4 has three coils 6a, 6b, 6c arranged in a reverse fan shape and is integrally formed with the resin frame 7. The armature 4 includes coils 6a, 6b, 6
c, and a commutator 8 that rotates together with two electrode brushes 9 extending from the lower portion of the casing 2.
, The polarity of the three coils 6a, 6b, 6c is alternately switched, and each time the attracting force and the repulsive force are generated with the field magnet 3, the armature 4 continues to rotate. In particular, when used as a vibration generating device, the armature 4 itself is largely eccentric as described above, so that the armature 4 rotates with a large centrifugal force. Become.

[0004]

By the way, recently, the miniaturization of the pager, the mobile phone, the massage machine, the signal receiver for the visually impaired, and the like has been progressing more and more, and the miniaturization and the weight reduction of the vibration generator have been correspondingly performed. There are also severe demands. However, as described above, at least three armatures 4 are generated because rotation force is generated by repetition of attraction force and repulsion force between the field magnet 3 and the coils 6a, 6b, 6c whose polarity is alternately switched. Coil 6a,
6b and 6c are required. That is, as shown in FIG. 13, when the armature 4 is constituted by one coil 6 having a rotation center angle of approximately 90 °, when the armature 4 is stopped, the N and S poles are divided into four equal parts. One polarity (S in FIG. 13)
This is because, if the armature 4 enters the pole, when the armature 4 is to be started next time, a situation occurs in which the rotation direction of the armature 4 is not determined and the armature 4 does not start smoothly. This corresponds to the area Z on the magnet 3 corresponding to the winding width of the coil 6.
This phenomenon is observed when both sides 6d and 6e of the coil 6 remain inside.

Accordingly, the present invention provides an armature structure in which even when an armature is constituted by one or two coils, the armature can be reliably and smoothly rotated when starting. It is intended to further reduce the size and weight of the motor.

Further, the present invention aims at simplifying the manufacturing process and reducing the manufacturing cost by reducing the number of coils constituting the armature.

[0007]

That is, the armature structure of the flat motor according to the present invention is provided on a field magnet having N and S magnetic poles alternately via a gap in the axial direction with the field magnet. An armature of a flat motor having one or a plurality of coreless armature coils provided so as to rotate at a time, a permanent magnet having N and S poles is provided on the armature, and rotation of the armature is stopped. Then, the permanent magnet is positioned at the boundary between the N and S poles of the field magnet, and the N and S poles of the field magnet and the N and S poles of the permanent magnet are attracted. The feature is that the coreless armature coil is brought to a startable position by making it fit.

In the armature structure of a flat motor according to the present invention, the coreless armature coil is constituted by one piece, and N, S is provided on one side of a frame holding the coreless armature coil.
The present invention is also characterized in that a permanent magnet having a magnetic pole is projected.

In the armature structure of a flat motor according to the present invention, the coreless armature coil is constituted by one piece, and a permanent magnet having N and S poles is embedded in a frame holding the coreless armature coil. Is also characterized.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an armature structure of a flat motor according to the present invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of an armature structure of a flat motor according to the present invention. Armature 1
Numeral 0 indicates that one coreless armature coil 12 is disposed inside a substantially quarter-circular resin frame 11 and both are integrally formed. The commutators 14 a, 14 b, 14 c, 1 which are obtained by dividing a circle into four parts are provided on the key portion 13 of the resin frame 11.
4d is provided, and a shaft hole 15 serving as a rotation center of the armature 10 is formed at the center thereof. The coreless armature coil 12 is a one-turn coil having a shape substantially corresponding to the shape of the resin frame 11, and the opening angle θ1 of both side edges is about 90 degrees. The commutators 14a, 14b, 14c, 14d
Are two in the diagonal direction 14a and 14c, 14b and 1
4d are connected in common, and one of them is connected to the inner winding end 25 of the coreless armature coil 12, and the other is connected to the outer winding end 26. Note that armature 1
0 is used as a vibration generating motor, the air core 1 of the coreless armature coil 12 is used to increase the centrifugal force.
It is desirable to dispose a weight 17 at 6 (a part of the weight 17 is cut away in the figure). Further, the armature 10 shown in FIG.
Has a rotation center angle of about 90 degrees, but is not particularly limited to about 90 degrees.

In this embodiment, a permanent magnet 20 projects laterally from one side edge 11a of the resin frame 11.
The permanent magnet 20 is formed in a thin round bar shape or a cylindrical shape, and is slightly curved inward so as to form a part of an arc centered on the shaft hole 15. That is, the permanent magnet 2
The 0 projecting direction is substantially parallel to the rotation direction or the reverse rotation direction of the armature 10, and is orthogonal to the one side edge 11a. In addition, by making the cross-sectional shape of the permanent magnet 20 into a round bar shape, it becomes easy to form an N pole and an S pole on both sides of the permanent magnet 20. Of course, the same effect can be obtained even if the permanent magnet 20 has a cylindrical shape.

The strength of the magnetic force of the permanent magnet 20 depends on the length and the cross-sectional area of the permanent magnet 20, and must be appropriately selected. That is, when the armature 10 is stopped, a magnetic force for forcibly stopping the armature 10 at a predetermined position is required, while when the armature 10 is rotating, the magnetic force must be such that the rotation is not hindered. Need to be considered. The shape of the permanent magnet 20 is not limited to a thin round bar or a cylindrical shape like the above-described permanent magnet 20, and the same effect can be obtained by projecting a small flat plate or projecting an ellipsoid. .

FIG. 3 shows a positional relationship when the armature 10 having the above configuration is stopped by the field magnet 21. The field magnet 21 is obtained by dividing a disk into four equal parts and alternately arranging N poles and S poles.
The center portion 1 supports the keyed portion 13 of the armature 10 rotatably. After the armature 10 is rotated clockwise or counterclockwise on the field magnet 21 and the power supplied to the coreless armature coil 12 of the armature 10 is turned off, the S and N poles of the permanent magnet 20 Is the field magnet 21
The armature 10 is stopped in a state where the center in the longitudinal direction is located on the boundary line 22 between the N pole and the S pole of the field magnet 21. That is, the armature 1
0 always stops on the N pole of the field magnet 21 with the angle θ2 shifted by half the length of the permanent magnet 20;
One side 12a of the coreless armature coil 12 protrudes into the adjacent S pole on the other side. This is because when the armature 10 stops, the permanent magnet 20 and the field magnet 21
Is the permanent magnet 2 for the N pole of the field magnet 21.
For the S and S poles of 0, the N poles attract each other,
The armature 10 overcomes the free rotation and is forcibly stopped at that position. As described above, one side portion 12a of the coreless armature coil 12 protrudes to the S pole side more than in the region Z on the field magnet 21 where the armature 10 is hard to start. When the is started, it rotates smoothly.

Next, the principle of rotation of the armature according to the present invention will be described with reference to FIGS. Field magnet 21
Two electrode brushes 23 and 24 extend above, and the commutators 14a, 14b, 14c and 14 of the armature 10
d contacts. The electrode brushes 23 and 24 are driven by the commutators 14 a, 14 b, and 14 with the rotation of the armature 10.
It moves sequentially while sliding on c and 14d with a shift of about 90 degrees. FIG. 4 shows a state when the armature 10 is stopped. As described above, at this time, the permanent magnet 20 is located on the boundary between the N1 pole and the S2 pole of the field magnet 21,
Most of the coreless armature coil 12 is composed of the field magnet 2
1, and one side portion 12a is located on the S1 pole of the field magnet 21. When the switch is turned on in this state, the winding end 26 outside the coreless armature coil 12 is connected to the coreless armature coil 12 via the commutator 14d with which the tip of the electrode brush 23 contacts and the commutator 14b common to the commutator 14d. A current flows, and the electrode brush 24 is further fed from the inner winding end 25 through the commutators 14a and 14c.
When a current flows to the side, a magnetic field is generated in the coreless armature coil 12. At this time, assuming that the polarity of the magnetic field generated on the side of the coreless armature coil 12 facing the field magnet 21 is the N pole, the field magnet 21 immediately below it is
N1 is the same polarity as the polarity N1, and a repulsive force is generated. On the other hand, since the repulsive force is generated between the field magnet 21 and the polarity S1 adjacent to the field magnet 21, a rotational force is generated in the direction (clockwise direction) to generate electric power. The child 10 starts.

When the armature 10 rotates to the position shown in FIG. 5, the tip contact portion of one electrode brush 23 is in the gap between the commutators 14c and 14d, and the tip contact portion of the other electrode brush 24 is in the gap. Since the current enters the gap between the commutators 14a and 14b and no current flows through the coreless armature coil 12, magnetism disappears, but the armature 10 continues to rotate as it rotates.

Further, when the armature 10 is rotated to the position shown in FIG. 6, the current supplied from the electrode brush 23 is reversed from the inner winding end 25 through the commutators 14c and 14a. It flows to the armature coil 12 and passes through the commutator 14d from the outer winding end 26 to the electrode brush 24. Therefore, the coreless armature coil 12 has an opposite polarity S pole on the side facing the field magnet 21 and repels the lower pole S1 on the lower side of the field magnet 21 to apply a rotational force in the same direction. It will keep turning.

As described above, the armature 10 can keep rotating by repeating N and S alternately while rotating, and repeating repulsion and inquiries with the field magnet 21. In addition, as described above, the armature 10 is constituted by one coreless armature coil 12 and the provision of the weight 17 allows a large centrifugal force to be obtained, which has a great effect when used as a vibration generator.

When the armature 10 is rotated in the opposite direction (counterclockwise), the current supply direction is reversed or the winding direction of the coreless armature coil 12 is reversed. The rotation direction can be easily changed.

In the above embodiment, the permanent magnet 20 is projected in a direction substantially perpendicular to the one side edge 11a of the resin frame 11. However, if the permanent magnet 20 can generate N and S poles on both sides, it is not necessarily perpendicular. It is not necessary. In addition to providing the permanent magnet 20 on the other side edge 11b of the resin frame 11, it is also possible to protrude from the air core 16 of the coreless armature coil 12, as shown in FIG. Further, as shown in FIG. 8, the arm portion 30 may be extended to the opposite side to the coreless armature coil 12 with the key portion 13 interposed therebetween, and the permanent magnet 20 may protrude from the arm portion 30. As shown in FIG. 9, one side 1 of the resin frame 11 integrally formed with the coreless armature coil 12.
1a is formed wide, and a permanent magnet 20
May be embedded. With this configuration, the holding of the permanent magnet 20 becomes more reliable, and the permanent magnet 2
Since 0 can be molded together with the resin frame 11, the manufacturing process is facilitated. In the above-described embodiment, the case where the field magnet 21 is divided into four equal parts and the N and S polarities are alternately applied is described. May be appropriate.

The above is an embodiment in which the number of the coreless armature coils 12 constituting the armature 10 is one. However, as shown in FIG. The problem concerning the rotation start of the motor is the same. In this case as well, just like the armature 10 having the single coreless armature coil 12, the rotation start can be smoothly performed only by projecting the permanent magnet 20 to one side edge 11a of the resin frame 11 of the coreless armature coil 12. It can be done.

Although the above embodiment has described the case where the armature structure of the flat motor according to the present invention is applied to a vibration generator, the present invention can also be applied to an ordinary rotary motor or a stepping motor.

[0023]

According to the armature structure of the flat motor of the present invention thus constituted, a permanent magnet is provided on the armature, and when the rotation of the armature is stopped, the permanent magnet is switched to the N of the field magnet. Since the coil is located at the boundary between the pole and the S pole so that the coil is at the startable position, even when the armature has two or one coil, the rotation at the time of starting the armature is ensured. Smoothly performed, as a result, the flat motor can be further miniaturized and lightened, and it is effective in realizing a one or two armature motor from the viewpoint of reducing the number of manufacturing steps and manufacturing cost. In addition, as a motor as a vibration generating device, there is a great effect that one motor having a large eccentric action is provided for the purpose of obtaining a larger vibration.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of an armature structure of a flat motor according to the present invention.

FIG. 2 is a perspective view showing a main part of the armature.

FIG. 3 is a plan view showing a stop position of an armature on a field magnet.

FIG. 4 is an explanatory diagram at the time of starting showing the principle of rotation of an armature constituted by one coil.

FIG. 5 is an explanatory diagram immediately after starting showing the principle of rotation of an armature constituted by one coil.

FIG. 6 is an explanatory view of continuation of rotation showing the principle of rotation of an armature composed of one coil.

FIG. 7 is a plan view when a permanent magnet is arranged inside an armature.

FIG. 8 is a plan view when a permanent magnet is provided on an arm portion on a side opposite to a coil.

FIG. 9 is a plan view of an armature in which a permanent magnet is embedded in a resin frame.

FIG. 10 is a plan view of an armature constituted by two coils.

FIG. 11 is a longitudinal sectional view showing one example of a conventional flat motor.

FIG. 12 is a plan view showing an example of an armature used for a conventional flat motor.

FIG. 13 is a plan view showing a positional relationship when a conventional armature does not start on a field magnet.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 armature 11 resin frame 12 coreless armature coil 13 key portion 14, 14 a, 14 b, 14 c, 14 d commutator 15 shaft hole 25, 26 winding end 16 air core 17 weight 20 permanent magnet 21 field magnet 22 boundary line 30 arm

[Procedure amendment]

[Submission date] December 5, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Armature structure of flat motor

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armature structure of a flat motor applied to a device for transmitting vibrations to a human body, and more particularly to an armature constituted by one or a plurality of coreless armature coils. This is for a smooth restart.

[0002]

2. Description of the Related Art Devices for transmitting vibrations to the human body include a radio telephone calling device (hereinafter referred to as a pager), a cellular phone, a massage machine for giving a light vibration to the human body to exert a massage effect, and a signal for the visually impaired. Various types of receivers and the like are known, and include a flat motor in which an armature is eccentric.

As such a flat motor, for example, FIG.
1 and FIG. 12 are known (JP-A-6-205565). The vibration generator 1 includes a circular plate-shaped field magnet 3 fixed to the bottom of a casing 2, a rotatable armature 4 disposed to face the field magnet 3, and an armature 4. And a shaft 5 which is arranged in a slanting manner. The armature 4 has three coils 6a, 6b, 6c arranged in a reverse fan shape and is integrally formed with the resin frame 7. The armature 4 includes coils 6a, 6b, 6
c, and a commutator 8 that rotates together with two electrode brushes 9 extending from the lower portion of the casing 2.
, The polarity of the three coils 6a, 6b, 6c is alternately switched, and each time the attracting force and the repulsive force are generated with the field magnet 3, the armature 4 continues to rotate. In particular, when used as a vibration generating device, the armature 4 itself is largely eccentric as described above, so that the armature 4 rotates with a large centrifugal force. Become.

[0004]

By the way, recently, the miniaturization of the pager, the mobile phone, the massage machine, the signal receiver for the visually impaired, and the like has been progressing more and more, and the miniaturization and the weight reduction of the vibration generator have been correspondingly performed. There are also severe demands. However, as described above, at least three armatures 4 are generated because rotation force is generated by repetition of attraction force and repulsion force between the field magnet 3 and the coils 6a, 6b, 6c whose polarity is alternately switched. Coil 6a,
6b and 6c are required. That is, as shown in FIG. 13, when the armature 4 is constituted by one coil 6 having a rotation center angle of approximately 90 °, when the armature 4 is stopped, the N and S poles are divided into four equal parts. One polarity (S in FIG. 13)
This is because, if the armature 4 enters the pole, when the armature 4 is to be started next time, a situation occurs in which the rotation direction of the armature 4 is not determined and the armature 4 does not start smoothly. This corresponds to the area Z on the magnet 3 corresponding to the winding width of the coil 6.
This phenomenon is observed when both sides 6d and 6e of the coil 6 remain inside.

Accordingly, the present invention provides an armature structure in which even when an armature is constituted by one or two coils, the armature can be reliably and smoothly rotated when starting. It is intended to further reduce the size and weight of the motor.

Further, the present invention aims at simplifying the manufacturing process and reducing the manufacturing cost by reducing the number of coils constituting the armature.

[0007]

That is, the armature structure of the flat motor according to the present invention is provided on a field magnet having N and S magnetic poles alternately via a gap in the axial direction with the field magnet. An armature of a flat motor having one or a plurality of coreless armature coils provided so as to rotate at a time, a permanent magnet having N and S poles is provided on the armature, and rotation of the armature is stopped. Then, the permanent magnet is positioned at the boundary between the N and S poles of the field magnet, and the N and S poles of the field magnet and the N and S poles of the permanent magnet are attracted. The feature is that the coreless armature coil is brought to a startable position by making it fit.

[0008] In the armature structure of the flat motor according to the present invention, the coreless armature coil is constituted by one or a plurality of coreless armature coils.
The present invention is also characterized in that a permanent magnet having N and S magnetic poles protrudes from the side.

In the armature structure of a flat motor according to the present invention, the coreless armature coil is constituted by one or more, and a permanent magnet having N and S poles is provided in a frame holding the coreless armature coil. It is also characterized by being embedded.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an armature structure of a flat motor according to the present invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of an armature structure of a flat motor according to the present invention. Armature 1
Numeral 0 indicates that one coreless armature coil 12 is disposed inside a substantially quarter-circular resin frame 11 and both are integrally formed. The commutators 14 a, 14 b, 14 c, 1 which are obtained by dividing a circle into four parts are provided on the key portion 13 of the resin frame 11.
4d is provided, and a shaft hole 15 serving as a rotation center of the armature 10 is formed at the center thereof. The coreless armature coil 12 is a one-turn coil having a shape substantially corresponding to the shape of the resin frame 11, and the opening angle θ1 of both side edges is about 90 degrees. The commutators 14a, 14b, 14c, 14d
Are two in the diagonal direction 14a and 14c, 14b and 1
4d are connected in common, and one of them is connected to the inner winding end 25 of the coreless armature coil 12, and the other is connected to the outer winding end 26. Note that armature 1
0 is used as a vibration generating motor, the air core 1 of the coreless armature coil 12 is used to increase the centrifugal force.
It is desirable to dispose a weight 17 at 6 (a part of the weight 17 is cut away in the figure). Further, the armature 10 shown in FIG.
Has a rotation center angle of about 90 degrees, but is not particularly limited to about 90 degrees.

In this embodiment, a permanent magnet 20 projects laterally from one side edge 11a of the resin frame 11.
The permanent magnet 20 is formed in a thin round bar shape or a cylindrical shape, and is slightly curved inward so as to form a part of an arc centered on the shaft hole 15. That is, the permanent magnet 2
The 0 projecting direction is substantially parallel to the rotation direction or the reverse rotation direction of the armature 10, and is orthogonal to the one side edge 11a. In addition, by making the cross-sectional shape of the permanent magnet 20 into a round bar shape, it becomes easy to form an N pole and an S pole on both sides of the permanent magnet 20. Of course, the same effect can be obtained even if the permanent magnet 20 has a cylindrical shape.

The strength of the magnetic force of the permanent magnet 20 depends on the length and the cross-sectional area of the permanent magnet 20, and must be appropriately selected. That is, when the armature 10 is stopped, a magnetic force for forcibly stopping the armature 10 at a predetermined position is required, while when the armature 10 is rotating, the magnetic force must be such that the rotation is not hindered. Need to be considered. The shape of the permanent magnet 20 is not limited to a thin round bar or a cylindrical shape like the above-described permanent magnet 20, and the same effect can be obtained by projecting a small flat plate or projecting an ellipsoid. .

FIG. 3 shows a positional relationship when the armature 10 having the above configuration is stopped by the field magnet 21. The field magnet 21 is obtained by dividing a disk into four equal parts and alternately arranging N poles and S poles.
The center portion 1 supports the keyed portion 13 of the armature 10 rotatably. After the armature 10 is rotated clockwise or counterclockwise on the field magnet 21 and the power supplied to the coreless armature coil 12 of the armature 10 is turned off, the S and N poles of the permanent magnet 20 Is the field magnet 21
The armature 10 is stopped in a state where the center in the longitudinal direction is located on the boundary line 22 between the N pole and the S pole of the field magnet 21. That is, the armature 1
0 always stops on the N pole of the field magnet 21 with the angle θ2 shifted by half the length of the permanent magnet 20;
One side 12a of the coreless armature coil 12 protrudes into the adjacent S pole on the other side. This is because when the armature 10 stops, the permanent magnet 20 and the field magnet 21
Is the permanent magnet 2 for the N pole of the field magnet 21.
For the S and S poles of 0, the N poles attract each other,
The armature 10 overcomes the free rotation and is forcibly stopped at that position. As described above, one side portion 12a of the coreless armature coil 12 protrudes to the S pole side more than in the region Z on the field magnet 21 where the armature 10 is hard to start. When the is started, it rotates smoothly.

Next, the principle of rotation of the armature according to the present invention will be described with reference to FIGS. Field magnet 21
Two electrode brushes 23 and 24 extend above, and the commutators 14a, 14b, 14c and 14 of the armature 10
d contacts. The electrode brushes 23 and 24 are driven by the commutators 14 a, 14 b, and 14 with the rotation of the armature 10.
It moves sequentially while sliding on c and 14d with a shift of about 90 degrees. FIG. 4 shows a state when the armature 10 is stopped. As described above, at this time, the permanent magnet 20 is located on the boundary between the N1 pole and the S2 pole of the field magnet 21,
Most of the coreless armature coil 12 is composed of the field magnet 2
1, and one side portion 12a is located on the S1 pole of the field magnet 21. When the switch is turned on in this state, the end of the electrode brush 23 comes into contact with the commutator 14d and the commutator 14b, which are in common with the commutator 14d, from the outer winding end 26 of the coreless armature coil 12 to the coreless armature coil 12. A current flows, and the electrode brush 24 is further fed from the inner winding end 25 through the commutators 14a and 14c.
When a current flows to the side, a magnetic field is generated in the coreless armature coil 12. At this time, assuming that the polarity of the magnetic field generated on the side of the coreless armature coil 12 facing the field magnet 21 is the N pole, the field magnet 21 immediately below it is
, And a repulsive force is generated, and the polarities S1 adjacent to the field magnet 21 are attracted to each other, so that a rotational force is generated in the direction (clockwise) to generate electric power. The child 10 starts.

When the armature 10 rotates to the position shown in FIG. 5, the tip contact portion of one electrode brush 23 is in the gap between the commutators 14c and 14d, and the tip contact portion of the other electrode brush 24 is in the gap. Since the current enters the gap between the commutators 14a and 14b and no current flows through the coreless armature coil 12, magnetism disappears, but the armature 10 continues to rotate as it rotates.

Further, when the armature 10 is rotated to the position shown in FIG. 6, the current supplied from the electrode brush 23 is reversed from the inner winding end 25 through the commutators 14c and 14a. It flows to the armature coil 12 and passes through the commutator 14d from the outer winding end 26 to the electrode brush 24. Therefore, the coreless armature coil 12 has an opposite polarity S pole on the side facing the field magnet 21 and repels the lower pole S1 on the lower side of the field magnet 21 to apply a rotational force in the same direction. It will keep turning.

As described above, the armature 10 can keep rotating by repeating N and S alternately while rotating, and repeating repulsion and inquiries with the field magnet 21. In addition, as described above, the armature 10 is constituted by one coreless armature coil 12 and the provision of the weight 17 allows a large centrifugal force to be obtained, which has a great effect when used as a vibration generator.

When the armature 10 is rotated in the opposite direction (counterclockwise), the current supply direction is reversed or the winding direction of the coreless armature coil 12 is reversed. The rotation direction can be easily changed.

In the above embodiment, the permanent magnet 20 is projected in a direction substantially perpendicular to the one side edge 11a of the resin frame 11. However, if the permanent magnet 20 can generate N and S poles on both sides, it is not necessarily perpendicular. It is not necessary. In addition to providing the permanent magnet 20 on the other side edge 11b of the resin frame 11, it is also possible to protrude from the air core 16 of the coreless armature coil 12, as shown in FIG. Further, as shown in FIG. 8, the arm portion 30 may be extended to the opposite side to the coreless armature coil 12 with the key portion 13 interposed therebetween, and the permanent magnet 20 may protrude from the arm portion 30. As shown in FIG. 9, one side 1 of the resin frame 11 integrally formed with the coreless armature coil 12.
1a is formed wide, and a permanent magnet 20
May be embedded. With this configuration, the holding of the permanent magnet 20 becomes more reliable, and the permanent magnet 2
Since 0 can be molded together with the resin frame 11, the manufacturing process is facilitated. In the above-described embodiment, the case where the field magnet 21 is divided into four equal parts and the N and S polarities are alternately applied is described. May be appropriate.

The above is an embodiment in which the number of the coreless armature coils 12 constituting the armature 10 is one. However, as shown in FIG. The problem concerning the rotation start of the motor is the same. In this case as well, just like the armature 10 having the single coreless armature coil 12, the rotation start can be smoothly performed only by projecting the permanent magnet 20 to one side edge 11a of the resin frame 11 of the coreless armature coil 12. It can be done.

Although the above embodiment has described the case where the armature structure of the flat motor according to the present invention is applied to a vibration generator, the present invention can also be applied to an ordinary rotary motor or a stepping motor.

[0023]

According to the armature structure of the flat motor of the present invention thus constituted, a permanent magnet is provided on the armature, and when the rotation of the armature is stopped, the permanent magnet is switched to the N of the field magnet. Since the coil is located at the boundary between the pole and the S pole so that the coil is at the startable position, even when the armature has two or one coil, the rotation at the time of starting the armature is ensured. Smoothly performed, as a result, the flat motor can be further miniaturized and lightened, and it is effective in realizing a one or two armature motor from the viewpoint of reducing the number of manufacturing steps and manufacturing cost. In addition, as a motor as a vibration generating device, there is a great effect that one motor having a large eccentric action is provided for the purpose of obtaining a larger vibration.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of an armature structure of a flat motor according to the present invention.

FIG. 2 is a perspective view showing a main part of the armature.

FIG. 3 is a plan view showing a stop position of an armature on a field magnet.

FIG. 4 is an explanatory diagram at the time of starting showing the principle of rotation of an armature constituted by one coil.

FIG. 5 is an explanatory diagram immediately after starting showing the principle of rotation of an armature constituted by one coil.

FIG. 6 is an explanatory view of continuation of rotation showing the principle of rotation of an armature composed of one coil.

FIG. 7 is a plan view when a permanent magnet is arranged inside an armature.

FIG. 8 is a plan view when a permanent magnet is provided on an arm portion on a side opposite to a coil.

FIG. 9 is a plan view of an armature in which a permanent magnet is embedded in a resin frame.

FIG. 10 is a plan view of an armature constituted by two coils.

FIG. 11 is a longitudinal sectional view showing one example of a conventional flat motor.

FIG. 12 is a plan view showing an example of an armature used for a conventional flat motor.

FIG. 13 is a plan view showing a positional relationship when a conventional armature does not start on a field magnet.

[Description of Signs] 10 Armature 11 Resin frame 12 Coreless armature coil 13 Kaname portion 14, 14a, 14b, 14c, 14d Commutator 15 Shaft hole 25, 26 Winding end portion 16 Air core portion 17 Weight 20 Permanent magnet 21 Field Magnetic magnet 22 Boundary line 30 Arm

Claims (3)

[Claims] 1. One or a plurality of coreless electric machines provided on a field magnet having N and S magnetic poles alternately so as to rotate relative to the field magnet via an axial gap. An armature of a flat motor having an armature coil, wherein the armature is provided with permanent magnets having N and S magnetic poles,
When the rotation of the armature is stopped, the permanent magnet is positioned at the boundary between the N and S poles of the field magnet, and the N and S poles of the field magnet and the N and S poles of the permanent magnet are positioned. An armature structure for a flat motor, wherein a coreless armature coil is brought to a startable position by attracting magnetic poles of the armature. 2. A coreless armature coil comprising a single piece, and a permanent magnet having N and S poles protrudes from one side of a frame holding the coreless armature coil. Item 2. An armature structure of a flat motor according to item 1. 3. The coreless armature coil is composed of one piece, and a permanent magnet having N and S magnetic poles is embedded in a frame holding the coreless armature coil. Armature structure of flat motor.