JP2001062398A - Vibration generating motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extremely superior vibration generating motor of simple constitution to be formed into a small size in which the cost is reduced. SOLUTION: A rotor 12 on which coils 14a, 14b and 14c are wound respectively on three coil winding wire sections 13a, 13b and 13c of a three-pole core 13 is included in a small direct current motor 10 for generating the vibration, and the vibration generating motor 10 is so constituted as to provide a weight 15 inserted at least into two adjacent coil winding wire sections 13a and 13c and fixed therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration generating motor for generating vibration as a vibrator call at the time of reception in, for example, a portable telephone, a pager or the like, and for generating vibration in a game machine controller. .

[0002]

2. Description of the Related Art Conventionally, such a vibration generating motor has
For example, it is configured as shown in FIG. That is, FIG.
4, the vibration generating motor 1 includes a small DC motor 2 having a known configuration, and an eccentric balancer 3 attached to a rotating shaft of the motor 2.

The small DC motor 2 is constructed by winding coils 5a, 5b and 5c around coil winding portions 4a, 4b and 4c of a core 4 shown in FIG. A rotor supported on the shaft 6,
A permanent magnet (not shown) disposed around the rotor;
It is composed of Then, each of the coils 5a, 5
By applying a DC voltage in an appropriate direction to the coils b and 5c via a slip ring (not shown) provided on the rotating shaft, the magnetic flux generated in each of the coils 5a, 5b and 5c and the magnetic flux of the permanent magnet With the above, the rotor can be driven to rotate in one direction.

The balancer 3 has a notch 3 a so that the center of gravity is shifted from the center of the rotating shaft 6.

[0005] The vibration generating motor 1 thus configured
According to the above, each coil 5a, 5b, 5c of the rotor is externally provided.
By appropriately energizing the rotating shaft, the rotor
It is driven to rotate around. At this time, since the balancer 3 is attached to the rotating shaft 6, the center of gravity of the rotor is shifted from the center of the rotating shaft 6 to one side, that is, the direction of the notch 3a of the balancer 3, so that the entire motor vibrates. Will occur.

[0006]

However, in the vibration generating motor 1 having such a configuration, since the balancer 3 is attached to the rotating shaft 6 of the small DC motor 2, the number of parts is large and assembly is troublesome. However, there is a problem that the cost increases. In addition, since the balancer 3 is provided outside the small DC motor 2, there is a problem that the entire vibration generating motor 1 becomes large.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a vibration generating motor which can be simply and miniaturized and can reduce the cost.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided, in accordance with the present invention, a small DC motor comprising a rotor having coils wound around three coil windings of a three pole core. This is achieved by a vibration generating motor, characterized in that a weight inserted and fixed between the two coil winding portions is provided.

[0009] Further, according to the present invention, there is provided a small DC power supply including a rotor having a coil wound around each of two coil winding portions among three coil winding portions of a three-pole core. The motor is provided with a weight inserted and fixed between two cores around which the coil is wound.

In the vibration generating motor according to the present invention, the weight preferably extends in the axial direction between the coil winding portions, and is formed on one axial side of the main body for positioning during insertion. And a step.

In the vibration generating motor according to the present invention, preferably, the weight main body has a shape corresponding to a space shape between the coil winding portions.

In the vibration generating motor according to the present invention, preferably, the weight main body is formed in a cylindrical shape.

In the vibration generating motor according to the present invention, preferably, the main body of the weight is formed in a rhombic column shape.

In the vibration generating motor according to the present invention, preferably, the weight extends radially inward from one end of the main body in a direction perpendicular to the axis and has a tip into which the rotating shaft of the rotor is inserted. It has a mounting part with a hole.

In the vibration generating motor according to the present invention, preferably, the weight mounting portion is formed in a substantially sector shape.

In the vibration generating motor according to the present invention, the weight main body and the mounting portion are preferably formed as separate members.

In the vibration generating motor according to the present invention, the weight body is preferably made of a copper-based sintered material, and the mounting portion is made of a high-strength iron-based steel plate.

In the vibration generating motor according to the present invention, preferably, a projection is provided at a tip of the main body of the weight, and a projection of the main body is provided at a mounting portion on a side opposite to a mounting hole into which a rotating shaft of the rotor is inserted. A mounting hole to be press-fitted is provided, and a projection of the main body is press-fitted into the mounting hole of the mounting portion, and then fixed by caulking.

In the vibration generating motor according to the present invention, preferably, the coil winding portion on which the coil is not wound is:
Lightweight.

Further, according to the present invention, the above object includes a rotor having a coil wound on each of two coil winding portions among three coil winding portions of a three-pole core.
In a small DC motor, the present invention is achieved by a vibration generating motor, wherein a weight is attached to a coil winding portion where the coil is not wound.

[0021]

According to the above construction, by appropriately energizing the respective coils of the rotor from the outside, the rotor is driven to rotate around the rotation axis, and the weight is attached eccentrically to the core. The center of gravity of the rotor is shifted to one side from the center of the rotation axis,
The entire motor will vibrate. Here, since the weight is provided on the core not inside the motor but inside the motor, the rotating shaft does not need to extend to the outside as the output shaft, and the entire motor is configured to be small. At the same time, the number of parts can be reduced, and the cost of parts and assembly can be reduced.

The weight can be attached to the core by being inserted into the space between the coil windings or being attached to the coil winding itself, so that a special weight for attaching the weight is provided. No members are required, and the weight can be easily attached with a simple configuration. Furthermore, when the coil is wound only in two coil winding parts among the three coil winding parts of the three poles, the coil is not wound in one coil winding part, Since the weight of the coil winding is lighter than the weights of the other coil windings and the eccentricity of the center of gravity due to the weight is greater, vibration is generated more efficiently.

In the case where the weight includes a body extending in the axial direction between the coil winding portions, and a positioning step formed on one side in the axial direction of the body for positioning at the time of insertion, When the weight is inserted into the space between the coil windings, the step is brought into contact with the coil windings to perform axial positioning, so that the weight can be easily assembled. become.

When the weight main body is formed in a shape corresponding to the shape of the space between the coil windings, preferably in the shape of a cylinder or a rhombic column, the weight is formed in the space between the coil windings. When inserted in the weight, the weight will be retained by the coil windings in a direction perpendicular to the axis, and the fit between the coil windings will be good.

In the case where the weight extends radially inward from the end on one side of the main body in a direction perpendicular to the shaft and has a mounting portion provided with a mounting hole at the end for inserting the rotation shaft of the rotor. The weight is held with respect to the rotating shaft by inserting the rotating shaft of the rotor into the mounting hole.

In the case where the coil winding portion on which the coil is not wound is lightened by, for example, a notch, a hollow portion or a thinner wall, the weight of the coil winding portion is reduced by that of the other coil winding portion. Since the weight becomes lighter than the weight of the center of gravity, the amount of eccentricity of the center of gravity due to the weight becomes larger, so that the vibration is generated more efficiently.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments shown in the drawings. 1 to 3
1 shows a first embodiment of a vibration generating motor according to the present invention. That is, the vibration generating motor 10 includes a rotor 12 rotatably supported by a rotating shaft 11 and a permanent magnet (not shown) disposed around the rotor, similarly to a small DC motor having a known configuration. It is composed of

The rotor 12 is constituted by winding coils 14a, 14b, 14c around three coil winding portions 13a, 13b, 13c of a core 13, respectively. Each of the coils 14a, 14b, 1
Slip ring 1 provided on rotating shaft 11 for 4c
1a, a direct current voltage is applied in an appropriate direction, and the interaction between the magnetic flux generated in each of the coils 14a, 14b, 14c and the magnetic flux of the permanent magnet causes the rotor 12 to rotate.
Can be driven to rotate in one direction.

Here, as shown in FIGS. 1 to 3, the core 13 has three coil winding portions 13a, 13b, 13b.
c, two coil winding portions 13a, 13a,
The weight 15 is inserted and fixed in the space between 13c. The weight 15 is made of, for example, Fe + Cu + W. Fe has a low material cost, Cu is relatively soft, and therefore can be easily processed, and W has a high specific gravity and is optimal for weight. Further, as shown in FIG. 4, the weight 15 includes a cylindrical main body 15a and a step 15b having a slightly larger diameter at one end of the main body 15a, and is inserted between the coil winding portions 13a and 13c. In this case, as shown by a dotted line in the drawing, at the final stage of insertion, the stepped portion 15b comes into contact with the coil winding portions 13a, 13b so that the positioning is performed in the axial direction. The weight 15 thus inserted is fixed at the other end by caulking or using, for example, a chloroprene rubber-based adhesive. The weight 15 only needs to be formed so that the shape of the main body 15a corresponds to the shape of the space between the coil winding portions 13a and 13c. For example, as shown in FIGS. A weight 16 having a rhombic column shape and having a similar step 16b may be used.

The vibration generating motor 1 according to the embodiment of the present invention
0 is configured as described above, and the rotor 12
By appropriately energizing each of the coils 14a, 14b, 14c, as in a known small DC motor,
The rotor 12 is driven to rotate around the rotation axis 11. At this time, the two coil winding portions 13a, 1
Since the weight 15 (or 16) is inserted and fixed in the space between 3c, the center of gravity of the core 13 and the rotor 12 is shifted from the center of the rotating shaft 11 to one side. Therefore, the whole motor 10 generates vibrations with the rotation of the rotor 12.

In this case, since the weight 15 is provided on the core 13 inside the motor 10 instead of outside the motor 10, the rotating shaft 11 does not need to extend to the outside as an output shaft. In addition, the entire motor 10 can be made compact, the number of parts can be reduced, and the cost of parts and assembly can be reduced. The weight 15 is inserted into the space between the coil winding portions 13a and 13c and fixed to the core 13 by caulking, bonding, or the like.
A special member for attaching the weight 15 to the core 13 is not required, and the weight can be easily attached with a simple configuration.

FIGS. 7 and 8 show a second embodiment of the vibration generating motor according to the present invention. 7 and 8, the vibration generation motor 20 is replaced by a weight 21 instead of the weight 15 in the vibration generation motor 10 shown in FIG.
It has a different configuration in that it has Here, similarly, the weight 21 is made of, for example, Fe + Cu + W, and the like.
The main body 21a includes a cylindrical main body 21a, a step portion 21b having a slightly larger diameter at one end of the main body 21a, and a mounting portion 21c extending in an L shape from one end of the main body 21a. The mounting portion 21c has a mounting hole 21d at a tip thereof into which the rotating shaft 11 of the motor 20 is inserted.

According to such a configuration, when the weight 21 is inserted between the coil winding portions 13a and 13c, the step portion 21b is connected to the coil winding portions 13a and 13c at the final stage of insertion.
b, it is positioned in the axial direction, and the rotating shaft 11 is inserted into the mounting hole 21d of the mounting portion 21c.
Is inserted, thereby positioning in the radial direction. And the weight 2 inserted in this way
1 is fixed at the other end by caulking or using, for example, a chloroprene rubber-based adhesive. Further, when the rotating shaft 11 is press-fitted into the mounting hole 21d, the press-fitting causes the weight 21 to be fixedly held to the rotating shaft 11, so that the above-described caulking, bonding, and the like are unnecessary.

The weight 21 only needs to be formed so that the shape of the main body 21a corresponds to the shape of the space between the coil winding portions 13a and 13c. For example, as shown in FIGS. A weight 22 in which the main body 22a has a rhombic columnar shape and includes a similar step portion 22b and a mounting portion 22c may be used.

Further, in consideration of the centrifugal force at the time of high-speed rotation, the weights 21 and 22 may be used as the fan-shaped mounting portions 23c as shown in FIGS. In addition, it is possible to obtain a structure with increased strength, and to increase the weight of the entire weight 23.

Further, the weights 21 and 22 made of Fe + Cu + W and the like described above are provided with main bodies 21a and 22a of the weights 21 and 22 in order to increase the strength of the mounting portions 21c and 22c which receive the strongest centrifugal force during high-speed rotation. Attachments 21c, 2
2c is a separate member, and the main body 24a of the weight 24 is made of a heavy copper-based sintered material.
14 and 15 are made of a high-strength iron-based material, for example, SECC (lead-plated steel plate).
As shown in the figure, a projection 24e is provided at the tip of the main body 24a,
Separately from the mounting portion 24c, a mounting hole 24f into which the protrusion 24e of the main body 24a is inserted is provided on a side opposite to the mounting hole 24d into which the rotating shaft 11 of the motor 20 is inserted. The protrusion 24 of the main body 24a is inserted into the hole 24f.
After press-fitting / inserting e, its tip is fixed by caulking.
Therefore, since the main body 24a of the weight 24 and the mounting portion 24c are formed as separate members and fixed by a simple configuration, the cost can be reduced and the strength can be increased as compared with the conventional one.

The above-described vibration generating motors 10 and 20
Weight 15 or 16, 21 or 22, 23 or 24
, Which are configured schematically as shown in FIG. That is, in FIG. 16, the three coil winding portions 13a, 13b, 13c of the three-pole core 13 are used.
Of the two coil winding portions 13a, 1
A weight W1 (actually, 15 or 16, 21, 22, 23, 24) is inserted in the space between 3c.

On the other hand, in the third embodiment of the vibration generating motor according to the present invention, as shown in FIG. 17, not only between the coil winding portions 13a and 13c, but also between the coil winding portions 13b and 13c. Even if the weight W2 is inserted between them, the center of gravity of the rotor 13 will be eccentric. In this case, the weights of the weights W1 and W2 may be the same or different. The vibration generating motor 3 having such a configuration.
According to 0, since the weights W1 and W2 are inserted between the coil winding portions 13a and 13c and between the coil winding portions 13b and 13c, respectively, the center of gravity of the core 13 is displaced from the center of rotation. At this time, the entire motor generates vibration.

Further, in the fourth embodiment of the vibration generating motor according to the present invention, as shown in FIG. 18, a weight W3 may be inserted between the coil winding portions 13a and 13b. In this case, if the weights W1, W2, and W3 all have the same weight, the center of gravity of the rotor 13 coincides with the center of the rotating shaft 11, so that at least one weight W1,
W2 and W3 are selected to be different in weight from other weights. According to the vibration generating motor 40 having such a configuration, the weights W1, W2, and W3 are respectively provided between the coil winding portions 13a and 13c, between the coil winding portions 13b and 13c, and between the coil winding portions 13a and 13b. By being inserted, core 1
Since the center of gravity of 3 is displaced from the center of rotation, the entire motor will vibrate during rotational driving.

FIG. 19 shows a fifth embodiment of the vibration generating motor according to the present invention. 19, the vibration generating motor 50 is the vibration generating motor 1 shown in FIG.
0, except that the coil 14b is not wound around the coil winding portion 13b located on the opposite side of the weight 15. According to the vibration generating motor 50 having such a configuration, since the coil 14b is not wound around the coil winding portion 13b on the side opposite to the weight 15, the weight of the coil winding portion 13b is reduced. The center of gravity of the core 13 is further shifted from the rotation center to the opposite side, and the amount of eccentricity increases. Therefore, a larger vibration can be obtained due to the eccentricity during the rotation driving.

FIG. 20 shows a sixth embodiment of the vibration generating motor according to the present invention. 20, the vibration generating motor 60 has the same configuration as the vibration generating motor 50 shown in FIG. 19, but a hollow portion 13d is provided in the coil winding portion 13b located on the side opposite to the weight 15. It has a different configuration in that According to the vibration generating motor 60 having such a configuration, the hollow portion 13d is provided in the coil winding portion 13b on the side opposite to the weight 15, so that
Since the weight of the coil winding portion 13b is further reduced, the center of gravity of the core 13 is further shifted from the rotation center to the opposite side, and the amount of eccentricity is increased. Therefore, a larger vibration can be obtained due to the eccentricity during the rotation driving.

FIG. 21 shows a seventh embodiment of the vibration generating motor according to the present invention. 21, the vibration generating motor 70 has the same configuration as the vibration generating motor 50 shown in FIG. 19, except that the coil winding portion 13b located on the opposite side to the weight 15 is formed thin. Has a different configuration. According to the vibration generating motor 70 having such a configuration, the coil winding portion 13 on the opposite side to the weight 15 is provided.
b is formed thin, so that the coil winding portion 1
Since the weight of 3b is further reduced, the center of gravity of the core 13 is further shifted from the rotation center to the opposite side, and the amount of eccentricity is increased. Therefore, a larger vibration can be obtained due to the eccentricity during the rotation driving.

FIG. 22 shows an eighth embodiment of the vibration generating motor according to the present invention. In FIG. 22, the vibration generating motor 80 has the same configuration as the vibration generating motor 50 shown in FIG. 19, but instead of the weight 15, the coil winding portion 13b in which the coil 14b is not wound is used. Thus, the configuration is different in that a weight 81 is mounted. The weight 81 is made of, for example, Fe + Cu + W, and is formed in a “U” shape as shown in FIG. 23. The weight 81 is formed on the coil winding portion 13b so that the coil winding portion 13b enters the opening portion 81a. It is attached to the main body and fixed by, for example, bonding.

According to the vibration generating motor 80 having such a configuration, the weight 81 is attached to the coil winding portion 13b where the coil 14b is not wound, so that the core 13
Is shifted to the weight 81 side. Therefore, at the time of rotation driving, a larger vibration can be obtained by this eccentricity.

In the above embodiment, the vibration generating motors 10, 20, 30, 40, 50, 60, 70, 8
0 is provided with three coil windings, but the present invention is not limited to this. Even in a small DC motor in which a core having two or four or more coil windings is used. Obviously, the invention can be applied.

[0046]

As described above, according to the present invention, by appropriately energizing each coil of the rotor from the outside, the rotor can be driven to rotate around the rotation axis and the core can be rotated. Since the weight is attached in an eccentric state, the center of gravity of the rotor is shifted to one side from the center of the rotating shaft, so that the entire motor generates vibration.

Here, since the weight is provided on the core inside the motor instead of outside the motor, the rotating shaft does not need to extend to the outside as the output shaft. And the number of parts can be reduced, and parts costs and assembly costs can be reduced. In addition, the weight is inserted into the space between the coil windings or is attached to the coil winding itself,
Since it can be attached to the core, a special member for attaching the weight is not required, and the weight can be easily attached with a simple configuration.

Thus, according to the present invention, it is possible to provide a very excellent vibration generating motor which can be simply and miniaturized and can be reduced in cost.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a rotor in a first embodiment of a vibration generating motor according to the present invention.

FIG. 2 is an axial sectional view of the rotor of FIG. 1;

FIG. 3 is an end view of the rotor of FIG. 1;

FIG. 4 is an enlarged perspective view of a weight used in the rotor of FIG. 1;

FIG. 5 is an end view showing a modified example of the rotor of FIG. 1;

FIG. 6 is an enlarged perspective view of a weight used in the rotor of FIG. 5;

FIG. 7 is an axial sectional view of a rotor in a second embodiment of the vibration generating motor according to the present invention.

FIG. 8 is an end view of the rotor of FIG. 7;

FIG. 9 is an enlarged perspective view of a weight used in the rotor of FIG. 7;

FIG. 10 is an end view showing a modified example of the rotor of FIG. 7;

FIG. 11 is an enlarged perspective view of a weight used in the rotor of FIG. 10;

FIG. 12 is an end view showing a second modification of the rotor of FIG. 7;

FIG. 13 is an enlarged perspective view of a weight used in the rotor of FIG. 11;

FIG. 14 is an end view showing a third modified example of the rotor of FIG. 7;

FIG. 15 is an enlarged perspective view of a weight used in the rotor of FIG. 14;

FIG. 16, FIG. 5, FIG. 8, FIG. 10, FIG. 12, and FIG.
FIG. 4 is a schematic end view showing the rotor in FIG.

FIG. 17 is a schematic end view of a rotor in a third embodiment of the vibration generating motor according to the present invention.

FIG. 18 is a schematic end view of a rotor in a vibration generating motor according to a fourth embodiment of the present invention.

FIG. 19 is a schematic end view of a rotor in a fifth embodiment of the vibration generating motor according to the present invention.

FIG. 20 is a schematic end view of a rotor in a vibration generating motor according to a sixth embodiment of the present invention.

FIG. 21 is a schematic end view of a rotor in a vibration generating motor according to a seventh embodiment of the present invention.

FIG. 22 is a schematic end view of a rotor in an eighth embodiment of the vibration generating motor according to the present invention.

FIG. 23 is an enlarged perspective view of a weight used in the rotor of FIG. 22;

FIG. 24 is a schematic perspective view showing an example of a conventional vibration generating motor.

FIG. 25 is a side view of a core in the vibration generating motor of FIG. 24;

[Explanation of symbols]

10, 20, 30, 40, 50, 60, 70, 80
Vibration generating motor 11 Rotary shaft 12 Rotor 13 Core 13a, 13b, 13c Coil winding part 14a, 14b, 14c Coil 15, 16, 21, 22, 23, 24, 81 Weight 15a, 16a, 21a, 22a, 23a, 24a
Main body 15b, 16b, 21b, 22b Stepped portion 21c, 22c, 23c, 24c Mounting portion 21d, 22d, 24d, 24e Mounting hole 24f Projection W1, W2, W3 Weight

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[Procedure amendment]

[Submission Date] May 12, 2000 (2000.5.1)
2)

[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] Vibration generating motor

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration generating motor for generating vibration as a vibrator call at the time of reception in, for example, a portable telephone, a pager or the like, and for generating vibration in a game machine controller. .

[0002]

2. Description of the Related Art Conventionally, such a vibration generating motor has
And it is configured as shown for example in FIG. That is, in FIG. 7 , the vibration generating motor 1 includes a small DC motor 2 having a known configuration and an eccentric balancer 3 attached to a rotating shaft of the motor 2.

[0003] Rotation said small DC motor 2 through the coil winding portion 4a of the core 4 shown in FIG. 8, 4b, against 4c, the coil 5a respectively, 5b, a and center is configured by winding the 5c It comprises a rotor supported on the shaft 6 and a permanent magnet (not shown) disposed around the rotor. Then, each of the coils 5a, 5b,
By applying a DC voltage in an appropriate direction to the coil 5c via a slip ring (not shown) provided on the rotating shaft, the magnetic flux generated in each of the coils 5a, 5b, 5c and the magnetic flux of the permanent magnet are changed. The interaction allows the rotor to be driven to rotate in one direction.

The balancer 3 has a notch 3 a so that the center of gravity is shifted from the center of the rotating shaft 6.

[0005] The vibration generating motor 1 thus configured
According to the above, each coil 5a, 5b, 5c of the rotor is externally provided.
By appropriately energizing the rotating shaft, the rotor
It is driven to rotate around. At this time, since the balancer 3 is attached to the rotating shaft 6, the center of gravity of the rotor is shifted from the center of the rotating shaft 6 to one side, that is, the direction of the notch 3a of the balancer 3, so that the entire motor vibrates. Will occur.

[0006]

However, in the vibration generating motor 1 having such a configuration, since the balancer 3 is attached to the rotating shaft 6 of the small DC motor 2, the number of parts is large and assembly is troublesome. However, there is a problem that the cost increases. In addition, since the balancer 3 is provided outside the small DC motor 2, there is a problem that the entire vibration generating motor 1 becomes large.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a vibration generating motor which can be simply and miniaturized and can reduce the cost.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided, in accordance with the present invention, a small DC motor comprising a rotor having coils wound around three coil windings of a three pole core. heavy between the two coil winding which
The weight is inserted and fixed between the coil windings.
An axially extending body, formed on one axial side of the body;
And a step for positioning during insertion.
The main body is a square square corresponding to the shape of the space between the coil windings.
It is formed in the shape of a rectangular rhombus, and the step is
Characterized by being formed on two sides near the rotation axis of the body ,
This is achieved by a vibration generating motor.

[0009]

According to the above construction, by appropriately energizing the respective coils of the rotor from the outside, the rotor is driven to rotate around the rotation axis, and the weight is attached eccentrically to the core. The center of gravity of the rotor is shifted to one side from the center of the rotation axis,
The entire motor will vibrate. Here, since the weight is provided on the core not inside the motor but inside the motor, the rotating shaft does not need to extend to the outside as the output shaft, and the entire motor is configured to be small. At the same time, the number of parts can be reduced, and the cost of parts and assembly can be reduced.

Also, the weight can be attached to the core by being inserted into the space between the coil windings or being attached to the coil winding itself, so that a special weight for attaching the weight is provided. No members are required, and the weight can be easily attached with a simple configuration.

In the case where the weight includes a main body extending in the axial direction between the coil winding portions, and a positioning step formed on one side in the axial direction of the main body for positioning at the time of insertion, When the weight is inserted into the space between the coil windings, the step is brought into contact with the coil windings to perform axial positioning, so that the weight can be easily assembled. become.

When the weight main body is formed in a shape corresponding to the space between the coil windings, preferably in a cylindrical or rhombic column shape, the weight is formed in the space between the coil windings. When inserted in the weight, the weight will be retained by the coil windings in a direction perpendicular to the axis, and the fit between the coil windings will be good.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments shown in the drawings. 1 to 3
1 shows a first embodiment of a vibration generating motor according to the present invention. That is, the vibration generating motor 10 includes a rotor 12 rotatably supported by a rotating shaft 11 and a permanent magnet (not shown) disposed around the rotor, similarly to a small DC motor having a known configuration. It is composed of

The rotor 12 is constructed by winding coils 14a, 14b, 14c around three coil winding portions 13a, 13b, 13c of a core 13, respectively. Each of the coils 14a, 14b, 1
Slip ring 1 provided on rotating shaft 11 for 4c
1a, a direct current voltage is applied in an appropriate direction, and the interaction between the magnetic flux generated in each of the coils 14a, 14b, 14c and the magnetic flux of the permanent magnet causes the rotor 12 to rotate.
Can be driven to rotate in one direction.

Here, as shown in FIGS. 1 to 3, the core 13 has three coil winding portions 13a, 13b, 13b.
c, two coil winding portions 13a, 13a,
The weight 15 is inserted and fixed in the space between 13c. The weight 15 is made of, for example, Fe + Cu + W. Fe has a low material cost, Cu is relatively soft, and therefore can be easily processed, and W has a high specific gravity and is optimal for weight. Further, as shown in FIG. 4, the weight 15 includes a cylindrical main body 15a and a step 15b having a slightly larger diameter at one end of the main body 15a, and is inserted between the coil winding portions 13a and 13c. In this case, as shown by a dotted line in the drawing, at the final stage of insertion, the stepped portion 15b comes into contact with the coil winding portions 13a, 13b so that the positioning is performed in the axial direction. The weight 15 thus inserted is fixed at the other end by caulking or using, for example, a chloroprene rubber-based adhesive. The weight 15 only needs to be formed so that the shape of the main body 15a corresponds to the shape of the space between the coil winding portions 13a and 13c. For example, as shown in FIGS. A weight 16 having a square quadrangular rhombic column shape and having a similar step 16b may be used. The step 16b is formed on two sides near the rotation shaft 11.
Have been.

A vibration generating motor 1 according to an embodiment of the present invention.
0 is configured as described above, and the rotor 12
By appropriately energizing each of the coils 14a, 14b, 14c, as in a known small DC motor,
The rotor 12 is driven to rotate around the rotation axis 11. At this time, the two coil winding portions 13a, 1
Since the weight 15 (or 16) is inserted and fixed in the space between 3c, the center of gravity of the core 13 and the rotor 12 is shifted from the center of the rotating shaft 11 to one side. Therefore, the whole motor 10 generates vibrations with the rotation of the rotor 12.

In this case, since the weight 15 is provided on the core 13 inside the motor 10 instead of outside the motor 10, the rotating shaft 11 does not need to extend to the outside as an output shaft. In addition, the entire motor 10 can be made compact, the number of parts can be reduced, and the cost of parts and assembly can be reduced. The weight 15 is inserted into the space between the coil winding portions 13a and 13c and fixed to the core 13 by caulking, bonding, or the like.
A special member for attaching the weight 15 to the core 13 is not required, and the weight can be easily attached with a simple configuration.

In the above embodiment, each of the cores 13 of the vibration generating motor 10 has three coil winding portions. However, the present invention is not limited to this, and two or four or more coil winding portions may be provided. It is clear that the present invention can be applied to a small DC motor using a core having the following.

[0019]

As described above, according to the present invention, by appropriately energizing each coil of the rotor from the outside, the rotor can be driven to rotate around the rotation axis and the core can be rotated. Since the weight is attached in an eccentric state, the center of gravity of the rotor is shifted to one side from the center of the rotating shaft, so that the entire motor generates vibration.

Here, since the weight is provided on the core not inside the motor but inside the motor, the rotating shaft does not need to extend to the outside as an output shaft, and the whole motor is small. And the number of parts can be reduced, and parts costs and assembly costs can be reduced. In addition, the weight is inserted into the space between the coil windings or is attached to the coil winding itself,
Since it can be attached to the core, a special member for attaching the weight is not required, and the weight can be easily attached with a simple configuration.

Thus, according to the present invention, it is possible to provide an extremely excellent vibration generating motor which can be simply and miniaturized and can reduce the cost.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a rotor in a first embodiment of a vibration generating motor according to the present invention.

FIG. 2 is an axial sectional view of the rotor of FIG. 1;

FIG. 3 is an end view of the rotor of FIG. 1;

FIG. 4 is an enlarged perspective view of a weight used in the rotor of FIG. 1;

FIG. 5 is an end view showing a modified example of the rotor of FIG. 1;

FIG. 6 is an enlarged perspective view of a weight used in the rotor of FIG. 5;

FIG. 7 is a schematic perspective view showing an example of a conventional vibration generating motor.

FIG. 8 is a side view of a core in the vibration generating motor of FIG. 7;

DESCRIPTION OF SYMBOLS 10 Vibration generation motor 11 Rotary shaft 12 Rotor 13 Core 13a, 13b, 13c Coil winding part 14a, 14b, 14c Coil 15, 16 Weight 15a, 16a Main body 15b, 16b Step

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Claims (13)

[Claims] 1. A small DC motor including a rotor having coils wound around three coil winding portions of a three-pole core, wherein the small DC motor is inserted and fixed between at least two adjacent coil winding portions. A motor for generating vibration, comprising a weight. 2. A three-pole core having three coil windings.
A small DC motor including a rotor having a coil wound around each of two coil winding portions, wherein a weight inserted and fixed between the two coil winding portions around which the coil is wound is provided. A motor for generating vibration. 3. The method according to claim 1, wherein the weight includes a main body extending in the axial direction between the coil windings, and a positioning step formed on one side of the main body in the axial direction for positioning during insertion. The vibration generating motor according to claim 1 or 2, wherein 4. The vibration generating motor according to claim 3, wherein the weight main body has a shape corresponding to a space shape between the coil winding portions. 5. The vibration generating motor according to claim 4, wherein the body of the weight is formed in a cylindrical shape. 6. The vibration generating motor according to claim 4, wherein the main body of the weight is formed in a rhombic column shape. 7. The weight has a mounting portion extending radially inward from one end of the main body in a direction perpendicular to the shaft and having a mounting hole at a tip end into which a rotation shaft of the rotor is inserted. The motor for generating vibration according to claim 3, wherein 8. The vibration generating motor according to claim 7, wherein the attachment portion of the weight is formed in a substantially sector shape. 9. The vibration generating motor according to claim 7, wherein the weight main body and the mounting portion are formed as separate members. 10. The vibration generating motor according to claim 9, wherein the body of the weight is made of a copper-based sintered material, and the mounting portion is made of a high-strength iron-based steel plate. 11. A projection is provided at a tip of the main body of the weight,
On the other hand, the mounting portion is provided with a mounting hole into which the projection of the main body is press-fitted on the side opposite to the mounting hole into which the rotating shaft of the rotor is inserted, and the projection of the main body is press-fitted into the mounting hole of the mounting portion, and then caulked and fixed. The vibration generating motor according to claim 9, wherein: 12. The vibration generating motor according to claim 2, wherein a coil winding portion on which the coil is not wound is reduced in weight. 13. A small DC motor including a rotor having a coil wound around each of two coil winding portions of the three coil winding portions of a three-pole core, wherein the coil is wound. A motor for generating vibrations, wherein a weight is attached to a coil winding part that does not have a coil.