JP2000032707A - Vibration motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration motor which can generate vibration efficiently with a simple construction. SOLUTION: The rotor 2 of a vibration motor which vibrates in accordance with the rotation of the rotor 2 has 1st and 2nd salient poles 21 and 22 to which exciting coils 21a and 22a are respectively applied, and a 3rd salient pole 23 to which an exciting coil is not applied. The 3rd salient pole 23 has a shape different from the shapes of the 1st and 2nd salient poles. Further, a weight is attached to the rotor 2 so as to make the center of gravity of the rotor 2 rotate with the rotary shaft 2a of the rotor as the center of rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration motor that vibrates as a rotor rotates.

[0002]

2. Description of the Related Art In recent years, as a calling function of a cellular phone, a pager or the like, an incoming call is transmitted by vibrating these devices themselves in order to avoid noise to the surroundings in addition to the conventional ringing sound. The method has been adopted.

As a vibrator used in this type of equipment, a vibration motor that vibrates with rotation of a rotor is used.

[0004] Generally, such a vibration motor is configured to generate vibration by appropriately providing a weight to a rotor or displacing a rotation axis of the rotor.

[0005]

Meanwhile, there is a tendency that a more compact portable telephone, pager, or the like as described above is desired. A light thing is needed.

However, in the case of a conventional vibration motor,
In order to obtain sufficient vibration, it is necessary to increase the weight provided on the rotor and increase the eccentric width of the rotating shaft, which results in the disadvantage that the motor becomes larger and heavier. there were.

Accordingly, an object of the present invention is to provide a vibration motor capable of efficiently generating vibration with a simple configuration in view of such a problem.

[0008]

According to a first aspect of the present invention, there is provided a vibration motor which vibrates with rotation of a rotor, wherein the rotor has first and second excitation coils mounted thereon. This is a vibration motor having a configuration including a salient pole and a third salient pole without an excitation coil.

As described above, according to the vibration motor of the present invention, the rotor includes the first and second salient poles each having the excitation coil mounted thereon and the third salient poles not having the excitation coil mounted thereon. As a result, vibration occurs due to an imbalance between the torque generated at the first and second salient poles and the torque generated at the third salient pole. That is, vibration can be obtained without providing a weight to the rotor or decentering the rotation axis of the rotor.

In particular, the third salient poles are generated at the first and second salient poles, because when the first and second salient poles are respectively excited, the third salient poles have a polarity corresponding to their excited state. The magnetic flux is induced in a closed curve by the third salient pole. Therefore, in these salient poles, the magnetic field is stabilized, and a strong torque can be generated.

If there is no third salient pole, if the first and second salient poles are excited to have the same polarity, most of those magnetic fluxes are canceled out, so that it is difficult to form a stable magnetic field.
Although this may hinder motor drive and startup, such a situation is avoided in the present invention.

According to a second aspect of the present invention, in the first aspect, a rotor yoke in which the first and second salient poles and the third salient pole are integrally formed is used. It is a vibration motor.

As described above, according to the vibration motor of the present invention, since the rotor yoke in which the first and second salient poles and the third salient pole are integrally formed is used, these salient poles are used. Easy and accurate assembly.

According to a third aspect of the present invention, in the first or second aspect, the vibration motor includes a commutator comprising first to third commutator pieces, and the first and second protrusions are provided. One end of the excitation coil attached to the pole is connected to the first and second commutator pieces, respectively, and the other end of these excitation coils is connected to the third commutator piece by a vibration motor. is there.

As described above, according to the vibration motor of the present invention, the commutator including the first to third commutator pieces is provided, and one end of the exciting coil mounted on the first and second salient poles is connected to the first and second salient poles, respectively. The first and second salient poles are connected to the first and second commutator segments, and the other ends of these exciting coils are connected to the third commutator segment. Then, by the combination of the polarities of these salient poles, it is possible to increase the fluctuation of the torque.

In particular, in such a commutator, one or both of the first and second salient poles are excited even when each commutator piece is short-circuited by, for example, a brush. Therefore, start-up failure is avoided.

According to a fourth aspect of the present invention, in the vibration motor according to any one of the first to third aspects, the third salient pole has a different shape from the first or the second salient pole. It is.

As described above, according to the vibration motor of the present invention, the shape of the third salient pole is different from that of the first or second salient pole. Vibrations also occur due to the imbalance in the weights of.

The shapes of these salient poles are made different by changing the shape of the tip or by changing the width or thickness.

In particular, since the third salient pole is not provided with an exciting coil, its shape can be arbitrarily set.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the rotating shaft of the rotor is
This is a vibration motor configured to be housed inside the case of the motor.

As described above, according to the vibration motor of the present invention, since the rotating shaft of the rotor is housed inside the case of the motor, when the motor is installed, there is no movable part outside the motor. There is no need to worry about interference with other parts. Therefore, it is easily installed.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the rotor is provided with a weight whose center of gravity rotates about the rotation axis of the rotor. Vibration motor.

As described above, according to the vibration motor of the present invention, since the rotor is provided with the weight whose center of gravity rotates about the rotation axis of the rotor, the vibration accompanying the rotation of the rotor is further increased. .

Such a weight is disposed by being supported on the rotating shaft or being formed integrally with the rotating shaft.

[0026]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIGS. 1 and 2, the vibration motor 1 of the present invention does not have the first and second salient poles 21 and 22 respectively having the excitation coils 21a and 22a mounted thereon and no excitation coil. The rotor 2 has a third salient pole 23 and is configured to generate vibration as the rotor 2 rotates about its rotation shaft 2a.

That is, the N pole 3 and the S pole 4 of the permanent magnet are arranged on the outer periphery of the rotor 2, and the motor 1 applies a current to each of the exciting coils 21a and 22a to
And by appropriately exciting the second salient poles 21 and 22,
It is configured to generate torque.

Further, since the third salient pole 23 does not perform excitation by the exciting coil, when the rotor 2 rotates, the torque generated by the first and second salient poles 21 and 22 and the third Due to the imbalance with the torque generated by the salient poles 23, vibration occurs.

In FIG. 1, reference numeral 5 denotes a rotating shaft 2a of the rotor 2.
And a case for holding the permanent magnet.

In the case of this example, the first to third salient poles 2
1, 2 and 23 are integrally formed rotor yokes, and the rotor 2 is provided with an exciting coil 2 and first and second salient poles.
1a and 22a are wound, and the rotary yoke is inserted through the center of the rotor yoke.

As shown in FIG. 3, a current is supplied to each of the excitation coils 21a and 22a by the first to third commutator pieces 61,
A commutator 6 composed of 62 and 63 and electrodes (+ pole,-
(Pole).

That is, one end of each of the excitation coils 21a and 22a is connected to the first and second commutator pieces 61 and 62, respectively, and the other end is connected to the third commutator piece 63. And the first and second salient poles 21 and 22
Are excited when the first to third commutator segments 61, 62, 63 come into sliding contact with the brushes 7, 7, respectively.

According to such a configuration, the first to third salient poles 21, 22, and 23 are formed according to the rotation angle of the rotor 2.
Polarities as shown in FIGS. 4A to 4D are generated. FIG. 5 is a table summarizing the relationship between the rotation angles of the rotor 2 and the polarities of the salient poles 21, 22, and 23 shown in these figures.

The first salient pole 21 or the second salient pole 22 shown by a broken line in FIG.
Is a state in which no current is supplied to the power supply.

4 (2), 4 (4) and 4
In (6), FIG. 4 (8), FIG. 4 (10), and FIG. 4 (12), one of the brushes 7, 7 is one of the first to third commutator pieces 61, 62, 63. The two commutator segments are short-circuited because they are in sliding contact with each other.

As shown in these figures, the first salient pole 21
Or, when the second salient pole 22 is excited to the N pole or the S pole,
The second salient pole 22 or the first salient pole 21 and the third salient pole 23 have an S pole or an N pole (FIGS. 4A and 4B).
(3), FIG. 4 (4), FIG. 4 (6), FIG. 4 (7), FIG.
(9), FIG. 4 (10), FIG. 4 (11)).

Further, when the first and second salient poles 21 and 22 are simultaneously excited to the N pole or the S pole, a relatively strong S pole or N pole is generated in the third salient pole 23 ( FIG. 4 (2),
FIG. 4 (8)).

If there is no third salient pole 23, most of the magnetic fluxes of the first and second salient poles 21 and 22 cancel each other out, so that it is difficult to form a stable magnetic field. However, in this example, such a situation is avoided.

That is, when the first and second salient poles are excited, the third salient poles have polarities in accordance with their excitation states, and thus are generated at the first and second salient poles. The magnetic flux is induced in a closed curve by the third salient pole. Therefore, the magnetic field is stabilized at these salient poles,
It is possible to generate a strong torque.

Further, the first salient pole 21 or the second salient pole 22
Is excited to the N pole, and the second salient pole 22 or the first
When the salient pole 21 is excited to the S pole, the third salient pole 23 does not have any polarity (FIG. 4 (5), FIG. 4 (1)).
1)).

The torque ratio of the rotor 2 varies as shown in FIG. 6 due to the combination of the polarities of the salient poles 21, 22, and 23. It should be noted that the numbers (1) to (12) given in FIG. 6 indicate locations corresponding to FIGS. 4 (1) to 4 (12), respectively.

As shown in the figure, the torque ratio of the rotor 2 temporarily increases in the state shown in FIG. 4 (2) and the state shown in FIG. 4 (8).

That is, at the moment when the first commutator piece 61 and the second commutator piece 62 are short-circuited by one brush 7,
The respective excitation coils 21a and 22a are electrically connected in parallel,
And the second salient pole 22 are excited to have the same polarity, and the third salient pole 23 has a relatively strong polarity.
The torque of the rotor 2 is sharply increased.

The motor 1 of this embodiment can vibrate greatly due to such a sudden change in torque.

In this embodiment, the exciting coils 21a, 2a
The wiring connecting the 2 a and the third commutator piece 63 may be configured to be wound around the third salient pole 23 several times. Such a wiring can be compared to a coil mounted on the third salient pole 23, but is insufficient to generate a torque for rotating the rotor 2, so that the first and second salient poles 21, 2
2 are distinguished from the excitation coils 21a and 22a.

The rotating shaft 2a of the rotor 2 is
Of the motor 1 so as not to be exposed to the outside of the motor 1.

According to such a configuration, when the present motor 1 is installed, since there is no movable portion outside the motor 1, there is no need to worry about interference with other parts.

The third salient pole 23 may have a different shape from the first or second salient poles 21 and 22, as shown in FIGS.

That is, the shape of the third salient pole 23 is as shown in FIG.
The shape of the tip may be changed as shown in FIG. 8, or the width and thickness may be changed as shown in FIG.

According to such a configuration, when the rotor 2 rotates, vibration can be generated due to the imbalance of the weights of the salient poles 21, 22, and 23.

The center of gravity of the rotor 2 is
A weight that rotates about the rotation shaft 2a may be provided.

That is, such a weight is caused by the rotation shaft 2a
Or formed integrally with the rotating shaft 2a.

According to such a configuration, the vibration accompanying the rotation of the rotor 2 can be further increased.

As described above, according to the vibration motor of this embodiment, the rotor is the first motor having the excitation coil mounted thereon.
And the second salient poles, and the third salient poles without the excitation coil, so that the torque generated by the first and second salient poles is different from the torque generated by the third salient poles. Equilibrium can cause vibration. That is, vibration can be obtained without providing a weight to the rotor or eccentrically rotating the rotation axis of the rotor, and vibration can be efficiently generated with a simple configuration.

In particular, the third salient poles are generated at the first and second salient poles, because when the first and second salient poles are respectively excited, the third salient poles have a polarity corresponding to their excited state. The magnetic flux can be guided in a closed curve by the third salient pole. Therefore, in these salient poles, the magnetic field is stabilized, and a strong torque can be generated.

If there is no third salient pole, if the first and second salient poles are excited to have the same polarity, most of those magnetic fluxes are canceled out, so that it is difficult to form a stable magnetic field.
Although this may hinder motor drive and startup, such a situation can be avoided in this example.

Further, according to the vibration motor of this embodiment, since the rotor yoke in which the first and second salient poles and the third salient pole are integrally formed is used, these salient poles can be formed easily and easily. Can be assembled correctly.

Further, according to the vibration motor of this embodiment, the commutator comprising the first to third commutator pieces is provided, and the first and second commutator pieces are provided.
And the other ends of these exciting coils were connected to the third commutator piece, respectively, so that the rotor was connected to the first and second commutator pieces. The first and second salient poles can be excited by the rotation angle, respectively, and the variation in torque can be increased by the combination of the polarities of these salient poles.

In particular, in such a commutator, even if each commutator piece is short-circuited by a brush, the first commutator can be used.
Since either one or both of the first and second salient poles can be excited, it is possible to avoid poor starting.

Further, according to the vibration motor of this embodiment, the rotor has a plurality of salient poles, and at least one of the salient poles has
The shape is different from other salient poles, that is, the third salient pole is
Since the shape is different from the first or second salient poles, when the rotor rotates, due to the imbalance of the weight of these salient poles,
Vibration can occur.

The shape of these salient poles can be changed by changing the shape of the tip or by changing the width or thickness.

In particular, since the third salient pole is not provided with an exciting coil, its shape can be arbitrarily set.

Further, according to the vibration motor of the present embodiment, the rotating shaft of the rotor is housed inside the case of the motor.
When installing the motor, since there is no movable part outside the motor, there is no need to worry about interference with other parts. Therefore, it can be easily installed.

Further, according to the vibration motor of this embodiment, the rotor is provided with the weight whose center of gravity rotates around the rotation axis of the rotor, so that the vibration accompanying the rotation of the rotor can be further increased. it can.

Further, such a weight can be disposed by being supported on the rotating shaft or integrally formed with the rotating shaft.

[0067]

According to the first aspect of the present invention, there is provided a vibration motor which vibrates with rotation of a rotor, wherein the rotor has first and second salient poles each having an excitation coil mounted thereon, This is a vibration motor having a configuration including a third salient pole to which no excitation coil is attached.

As described above, according to the vibration motor of the present invention, the rotor has the first and second salient poles each having the excitation coil mounted thereon and the third salient pole not having the excitation coil mounted thereon. With this configuration, vibration can be generated due to an imbalance between the torque generated by the first and second salient poles and the torque generated by the third salient pole. That is, vibration can be obtained without providing a weight to the rotor or eccentrically rotating the rotation axis of the rotor, and vibration can be efficiently generated with a simple configuration.

In particular, the third salient poles are generated at the first and second salient poles, because when the first and second salient poles are respectively excited, the third salient poles have polarities corresponding to their excitation states. The magnetic flux can be guided in a closed curve by the third salient pole. Therefore, in these salient poles, the magnetic field is stabilized, and a strong torque can be generated.

If there is no third salient pole, if the first and second salient poles are excited to have the same polarity, most of those magnetic fluxes are canceled out, so that it is difficult to form a stable magnetic field.
This may hinder motor drive and startup, but the present invention can avoid such a situation.

According to a second aspect of the present invention, in the first aspect, a rotor yoke in which the first and second salient poles and the third salient pole are integrally formed is used. It is a vibration motor.

As described above, according to the vibration motor of the present invention, the rotor yoke in which the first and second salient poles and the third salient pole are integrally formed is used. It can be easily and accurately assembled.

According to a third aspect of the present invention, in the first or second aspect, the vibration motor includes a commutator comprising first to third commutator pieces, and the first and second protrusions are provided. One end of the excitation coil attached to the pole is connected to the first and second commutator pieces, respectively, and the other end of these excitation coils is connected to the third commutator piece by a vibration motor. is there.

As described above, according to the vibration motor of the present invention, the commutator including the first to third commutator pieces is provided, and one end of the exciting coil mounted on each of the first and second salient poles is connected to the first and second salient poles, respectively. Since the other ends of these exciting coils are connected to the third commutator piece while being connected to the first and second commutator pieces, the first and second salient poles are respectively excited according to the rotation angle of the rotor. The variation in torque can be increased by the combination of the polarities of these salient poles.

In particular, in such a commutator, one or both of the first and second salient poles should be excited even when each commutator piece is short-circuited by, for example, a brush. Therefore, it is possible to avoid poor starting.

According to a fourth aspect of the present invention, in the vibration motor according to any one of the first to third aspects, the third salient pole has a different shape from the first or the second salient pole. It is.

As described above, according to the vibration motor of the present invention, the shape of the third salient poles is different from that of the first or second salient poles. Vibration can also be caused by the imbalance of the weights of.

The shapes of these salient poles can be changed by changing the shape of the tip or by changing the width or thickness.

In particular, since the third salient pole is not provided with an exciting coil, its shape can be arbitrarily set.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the rotating shaft of the rotor is
This is a vibration motor configured to be housed inside the case of the motor.

As described above, according to the vibration motor of the present invention, since the rotating shaft of the rotor is housed inside the case of the motor, when the motor is installed, there is no movable part outside the motor. There is no need to worry about interference with other parts. Therefore, it can be easily installed.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the rotor is provided with a weight whose center of gravity rotates about the rotation axis of the rotor. Vibration motor.

As described above, according to the vibration motor of the present invention, since the rotor is provided with the weight whose center of gravity rotates around the rotation axis of the rotor, the vibration accompanying the rotation of the rotor is further increased. be able to.

Further, such a weight can be disposed by being supported on the rotating shaft or integrally formed with the rotating shaft.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a vibration motor according to a specific example of the present invention.

FIG. 2 is an external view showing first to third salient poles according to a specific example of the present invention.

FIG. 3 is an explanatory view showing an exciting coil, a commutator, and a brush according to a specific example of the present invention.

FIG. 4 relates to a specific example of the present invention, and (1) to (12).
FIG. 3 is an explanatory diagram showing polarities of first to third salient poles at each rotational position of the rotor.

FIG. 5 is a table showing a relationship between a rotation angle of a rotor and polarities of salient poles according to a specific example of the present invention.

FIG. 6 relates to a rotation angle of a rotor according to a specific example of the present invention.
It is a schematic diagram which shows a torque ratio characteristic.

FIG. 7 is an external view showing first to third salient poles according to a specific example of the present invention.

FIG. 8 is an external view showing first to third salient poles according to a specific example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration motor 2 Rotor 2a Rotating shaft 3 N pole of permanent magnet 4 S pole of permanent magnet 5 Case 6 Commutator 7 Brush 21 First salient pole 21a Exciting coil 22 Second salient pole 22a Exciting coil 23 Third Salient pole 61 First commutator piece 62 Second commutator piece 63 Third commutator piece

Claims (6)

[Claims] 1. A vibration motor which vibrates with rotation of a rotor, wherein the rotor has first and second salient poles each having an excitation coil mounted thereon, and a third salient pole having no excitation coil mounted thereon. A vibration motor comprising: a pole; 2. The vibration motor according to claim 1, wherein a rotor yoke in which the first and second salient poles and the third salient pole are integrally formed is used. 3. The vibration motor includes a commutator comprising first to third commutator pieces, and one end of an exciting coil mounted on each of the first and second salient poles is connected to the first and second commutators. 3. The vibration motor according to claim 1, wherein the second commutator pieces are connected to each other, and the other ends of the exciting coils are connected to the third commutator pieces. 4. 4. The third salient pole has a different shape from the first or second salient pole.
The vibration motor according to any one of the above. 5. The vibration motor according to claim 1, wherein the rotating shaft of the rotor is housed inside a case of the motor. 6. The vibration motor according to claim 1, wherein the rotor has a weight whose center of gravity rotates about a rotation axis of the rotor.