JP2001178071A - Motor for generation of vibration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor for generation of vibration which can be constituted simply in small size and can reduce cost, without increasing the cogging and power consumption. SOLUTION: In a small-sized motor 10 for generation of vibrations, which include field magnets 14 arranged in circular form and in which N poles and S poles are magnetized alternately and an iron core 13, which is supported rotatably inside these field magnets by a rotary shaft 12 and has six pieces of salient poles 13a to 13f, extending outwardly in the radial direction, coils 15a, 15b, and 15c are wound only on the salient poles on one side from the center out of plural pieces of salient poles.

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 or a pager.

[0002]

2. Description of the Related Art Conventionally, such a vibration generating motor has
For example, it is configured as shown in FIGS. FIG.
5 to 5, 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.

In the small DC motor 2, coils 5a, 5b, 5c are wound around coil winding portions (salient poles) 4a, 4b, 4c of a core (iron core) 4 shown in FIG. And a field magnet 7 arranged around the rotor and having N and S poles alternately magnetized in the circumferential direction. Have been. Here, the field magnet 7 is connected to the case 2a.
It is attached to the inner surface.

Then, a DC voltage is applied in an appropriate direction to each of the coils 5a, 5b, 5c via a commutator 8 provided on the rotating shaft 6, so that each of the coils 5a, 5b, 5c.
The interaction between the magnetic fluxes generated in b and 5c and the magnetic flux of the field magnet 7 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 rotation 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 side opposite to the cutout 3a of the balancer 3, so that the entire motor is Vibration 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.

On the other hand, for example, Japanese Patent Application Laid-Open No. H8-3775
Japanese Patent Publication No. 3 discloses an eccentric iron core in which salient poles extending radially outward from the iron core are provided only on one side of the rotating shaft. According to such an eccentric iron core, vibration can be generated without using a separate balancer,
Since the balance is large, cogging becomes large and the driving current becomes large. Particularly, for example, in the case of a battery-operated mobile phone or a pager, there is a problem that it is not preferable.

The present invention has been made in view of the above points, and has as its object to provide a vibration generating motor which can be simply and miniaturized, and which can reduce cost without increasing power consumption. The purpose is.

[0009]

SUMMARY OF THE INVENTION According to the present invention, there is provided a field magnet (14) which is annularly arranged and has N and S poles alternately magnetized in the circumferential direction. Magnetic magnet (14)
A plurality of salient poles (13) rotatably supported by a rotation shaft (12) inside and extending radially outward.
a), (13b), (13c), (13d), (13)
e) and (13f), a plurality of salient poles (13a) and (13f).
b), (13c), (13d), (13e), (13)
f), salient poles (13a) and (13) on one side from the center.
b) and (13c) only, the coils (15a) and (15c)
b) and (15c) are wound,
This is achieved by the vibration generating motor (10).

The vibration generating motor according to the present invention (10)
Preferably, the field magnet (14) has four poles, and the iron core has six salient poles (13
a), (13b), (13c), (13d), (13)
e) and (13f).

[0011]

According to the above construction, the coils (15a), (15b), (15b), (15b), (15b),
The magnetic flux generated in (15c) interacts with the magnetic flux of the field magnet (14) to drive the rotor (13) to rotate around the rotation axis (12) and to be positioned on one side of the iron core. Only the salient poles (13a), (13b) and (13c) have coils (1
Since 5a), (15b) and (15c) are wound, the center of gravity of the iron core including the coil is shifted to one side from the center of the rotating shaft (12), so that the entire motor generates vibration. Will be.

Here, the eccentricity of the iron core, which is a rotating body, is not caused by the weight provided outside the motor, but by the salient poles (13) of the iron core.
a), (13b), the coil (1) wound around (13c)
5a), (15b) and (15c) are realized by the weight, so that the rotating shaft (12) does not need to extend to the outside as an output shaft, so that the whole motor can be made compact and In addition, the number of parts can be reduced, and parts costs and assembly costs can be reduced.

The iron cores have salient poles (13a), (13b), (13c), (1) extending outward at equal angular intervals.
3d), (13e), and (13f), it is possible to use a normal iron core, so that there is no need to manufacture a dedicated iron core, and it can be easily configured at low cost. In addition, since the iron core itself has a good rotational balance, it can be driven with a small drive current, so that power consumption can be reduced.

The field magnet (14) has four poles, and the iron core has six salient poles (13a),
(13b), (13c), (13d), (13e),
In the case of having (13f), the so-called cogging / attraction force generated when the iron core and the rotating shaft (12) are rotated is reduced, so that the electromotive force and current required for rotational driving are reduced. , A comfortable vibration is generated.
The reference numerals in the parentheses are provided for easy understanding, are merely examples, and are not limited to the illustrated embodiments.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments shown in the drawings. 1 and 2 show an embodiment of a vibration generating motor according to the present invention. In FIG. 1 and FIG.
0 is the case 1 as in the case of a small DC motor having a known configuration.
1, a rotor 13 rotatably supported by a rotating shaft 12 and a field magnet 1 disposed on an inner peripheral surface of a case 11.
4.

The case 11 is formed in a substantially hollow cylindrical shape, and rotatably supports the rotating shaft 12 by bearings 11a and 11b provided at both ends.

As shown in FIG. 2, the rotor 13 is composed of a core (iron core), and a plurality (six in the illustrated case) of coil windings extending radially outward at equal angular intervals from each other. Parts (salient poles) 13a, 13b, 13c, 13d, 1
By having 3e and 13f, a so-called six-pole configuration is obtained.

Of these coil winding portions 13a to 13f, one of the coil winding portions 13a,
13b and 13c have coils 15a, 15b,
15c is wound. Then, each of the coils 15
The winding terminals of a, 15b, and 15c are connected to a commutator 16 provided on the rotating shaft 12, and a DC voltage is externally applied to the coils 15a, 15b, The rotor 13 can be driven to rotate in one direction by the interaction between the magnetic fluxes generated in the coils 15a, 15b, 15c and the magnetic flux of the field magnet 14 by applying the magnetic flux to the coil 15a in an appropriate direction. It has become.

The field magnet 14 has a plurality of poles, in the illustrated case, a four-pole configuration, in which N and S poles are alternately magnetized at equal angular intervals in the circumferential direction. .

The vibration generating motor 1 according to the embodiment of the present invention.
0 is configured as described above, and lead 1
7 and each coil 15 of the rotor 13 via the commutator 16
a, 15b, and 15c, the rotor 13 is driven in the same manner as a known small DC motor.
Is driven to rotate around the rotation axis 11. At this time, the six coil winding portions 13a to 13f of the rotor 13
Of these, only the coil winding portions 13a, 13b, 13c located on one side with respect to the
Since b and 15c are wound, the center of gravity of the rotor 13 is shifted from the center of the rotating shaft 12 to one side. Therefore, the entire motor 10 vibrates with the rotation of the rotor 13.

In this case, the eccentricity of the rotor 13 is
The rotation of the rotating shaft 11 does not need to extend to the outside as the output shaft because the coil is provided by one side of the coil inside the motor 10 instead of the weight provided outside the motor 10, so that the entire motor 10 has a small size. And the number of parts can be reduced, and the cost of parts and assembly can be reduced. In addition, since the rotor 13 can use an ordinary iron core having six salient poles, a dedicated iron core is not required, and the rotor 13 can be easily configured as an eccentric rotor at low cost. Further, since the rotor 13 has six poles and the field magnet 14 has four poles, cogging / shock during rotation is small, so that an electromotive force and a driving current at the time of rotation driving are small, and power consumption is small. Can be reduced and pleasant vibrations will occur.

In the above-described embodiment, the rotor 13 as the iron core has the coil winding portions as the six salient poles. However, the present invention is not limited to this, and the rotor 13 may have five or less or seven or more salient poles. Rotor may be used. Further, in the above embodiment, the field magnet 14 is magnetized to four poles, but is not limited to this, and may be magnetized to two poles or six or more poles. In this case, if the number of poles of the field magnet 14 is the same as the number of salient poles of the iron core, the magnetic circuit and the core are in an equilibrium state, and a large current is required for the rotor 13 to start rotating. Therefore, since the rotor 13 does not rotate, it is necessary to set the number of poles different from the number of salient poles of the iron core. Further, in the above embodiment, a brush type DC motor in which a DC current is supplied to each of the coils 15a, 15b, 15c via the commutator 16 is used. It is clear that the present invention can be applied to the above.

[0023]

As described above, according to the present invention, by appropriately energizing the coils of the iron core from the outside, the rotor is driven to rotate around the rotation axis and the iron core is rotated. Since the coil is wound only on the salient pole located on one side, the center of gravity of the iron core including the coil is shifted to one side from the center of the rotating shaft, so that the entire motor generates vibration. .

Here, the eccentricity of the iron core as the rotating body is set by the weight of the coil wound around the salient poles of the iron core, not by the weight provided outside the motor.
The rotating shaft does not need to extend to the outside as the output shaft, and the entire motor can be made compact, the number of parts can be reduced, and the cost of parts and assembly can be reduced.

Further, since the iron core has salient poles extending outward at equal angular intervals from each other, a normal iron core can be used, so that there is no need to manufacture a dedicated iron core. It can be easily configured at low cost,
Since the iron core itself has a good rotational balance, it can be driven with a small drive current, so that power consumption can be reduced.

Thus, according to the present invention, it is possible to provide a vibration generating motor which can be simply and miniaturized, and which can reduce the cost without increasing the power consumption.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a configuration of an embodiment of a vibration generating motor according to the present invention.

FIG. 2 is a schematic sectional view of the vibration generating motor of FIG. 1;

FIG. 3 is a schematic plan view showing an example of a conventional vibration generating motor.

FIG. 4 is a schematic front view of the vibration generating motor of FIG. 3;

FIG. 5 is a schematic sectional view showing an internal configuration of the vibration generating motor of FIG. 3;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Vibration generation motor 11 Case 12 Rotating shaft 13 Rotor (iron core) 13a, 13b, 13c, 13d, 13e, 13f Coil winding part (salient pole) 14 Field magnet 15a, 15b, 15c Coil 16 Commutator 17 Lead line

Claims (3)

[Claims] 1. A field magnet which is annularly arranged and has N and S poles alternately magnetized in a circumferential direction, and is rotatably supported by a rotating shaft inside the field magnet and is arranged in a radial direction. A core having a plurality of salient poles extending outward and having equal angular intervals with each other, wherein a coil is formed only in one salient pole from the center of the plurality of salient poles. A motor for generating vibration, which is wound. 2. The vibration generating device according to claim 1, wherein the field magnet has four poles, and the iron core has six salient poles. motor. 3. The three salient poles on one side from the center of the six salient poles.
A vibration generating motor, wherein a coil is wound around each salient pole.