JP2000343033A - Vibration motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the rational generation of vibration while decreasing the number of parts and the number of assembly man-hours and making a size and weight smaller. SOLUTION: The rotor assembly 13 itself on a revolving shaft 15 supported at bearings on both sides is provided with unbalance elements consisting of one or >=2 combined means of mechanical means, magnetical means or electrical means. As a result, the rotation accompanied by the vibration is obtained. The rotation accompanied by the vibration is obtained by shifting centroid as the mechanical means, unbalancing the specifications of coil windings 17 as the electrical means and unbalancing the state of laminated core 14 as the magnetical means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration motor which is built in a portable electronic device such as a portable telephone or an electronic organizer or a game machine and functions as a vibration source.

[0002]

2. Description of the Related Art When notifying an incoming call such as a mobile phone or a PHS instead of an acoustic alarm, when notifying a user of time with an electronic organizer or other portable device, or using vibrations of various simulated operation objects or the like in a game machine. 2. Description of the Related Art A small vibration motor is widely used as a vibration source for transmitting vibrations to a human body, for example, in a case where a human body is sensed. In a conventional vibration motor of this type, a semicircular unbalanced weight is attached to an output shaft of a normal small motor, and a vibration is generated by rotation of the centrifugal force by the unbalanced weight during rotation.

In such a vibration motor of the type in which an unbalanced weight is added to a rotating shaft, the length of the shaft is long, and a semicircular unbalanced weight is provided around the shaft. As a part to be attached to the device, it must be surprisingly large. In addition, the unbalanced weight causes vibration when rotating, and there is a problem that some extra space must be added around the unbalanced weight in order to avoid contact with surrounding parts.

However, for example, in the case of a cellular phone which is one of the typical devices equipped with such a vibration motor, competition for the development of new models is remarkable, and various functions are required. There is a tendency for small and light weights to be required, and from such a viewpoint, various electronic components and substrates are also being miniaturized, and naturally, vibration motors are also required.

[0005] In this type of vibration motor, an unbalanced weight is added to the outside of one of the rotating shafts supported by two bearings. Rotational vibration is to be generated with the bearing as a fulcrum. That is, this is due to the fact that an unbalanced weight is simply coupled to a rotating shaft having a structure to drive a balanced load.

Accordingly, a large eccentric force is applied to the portion of the rotating shaft farther from the unbalanced weight, so that the bearing is partially reduced, and the life of the motor is extremely shortened as compared with the case where the bearing is used for a balanced load. It will be. In order to prevent such a shortening of the service life, it is necessary to employ stronger bearings and rotating shafts, which leads to an increase in manufacturing costs.

Further, in this type of motor, since the semicircular unbalanced weight is press-fitted to the rotary shaft and attached, the other end of the rotary shaft is pressed by the pressure applied at the time of press-fitting. Since there is a possibility that the abutting shaft end receiving portion may be damaged, it is necessary to construct this portion to have a sufficient strength.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above problems of the conventional vibration motor, reduces the number of parts and the number of assembling steps, and can generate vibrations rationally while reducing the size and weight. It is an object of the present invention to provide a vibration motor.

[0009]

SUMMARY OF THE INVENTION The present invention provides a housing assembly comprising a cylindrical housing, a ring-shaped magnet disposed on the inner peripheral surface thereof, and a bearing metal disposed at the center of the bottom of the cylindrical housing. A stator comprising a disk-shaped end bracket for closing an opening of a cylindrical housing, a pair of brushes fixed to the side surfaces of the disk-shaped housing via an insulator, and an end bracket assembly comprising a bearing metal disposed at the center of the disk-shaped end bracket. A rotating shaft that constitutes an assembly and is rotatably supported by the bearing metal; a laminated core externally fixed to the rotating shaft facing the ring-shaped magnet; a rotor formed by winding a conductor around the laminated core In a vibration motor in which a rotor assembly is constituted by a coil and a commutator fixed to the surface of the rotation shaft, The rotor assembly itself, a vibration motor having the unbalanced element by mechanical means, means combining one or two or more magnetic means or electrical means.

[0010] The unbalance element of the rotor assembly itself by the mechanical means is that a part of the rotor assembly, for example, a part of a pole piece of the laminated core is cut out to form a cavity,
A part is deleted or added to obtain an imbalance. This may also result in imbalance of the magnetic means. The unbalanced element of the rotor assembly by the magnetic means means that an unbalance is obtained by increasing or decreasing a part of the magnetic path. In this case, a part of the laminated core (iron core) often forms a magnetic path, and increasing or decreasing a part thereof is often not only a magnetic means but also an unbalance means by a mechanical means.

[0011] The unbalanced element by the electric means is to obtain the unbalance by reducing or increasing the number of turns or the wire diameter of the rotor coil of a specific pole. When the number of the rotor coils is increased or decreased, the generated magnetic flux is also increased or decreased in the same manner as the magnetic means, and therefore, the rotor coil is used as an electric and magnetic means. An increase or decrease in the number of windings or a wire diameter or the like often changes the mass, and in this case, it can also be a mechanical means.

Thus, according to the vibration motor of the present invention, the rotor assembly is principally attached to the rotor assembly by the action of the unbalanced element formed by mechanical means, magnetic means, or electric means, or a combination thereof. An unbalanced torque is generated, and inevitably rotates with vibration.

Further, the vibration generated by the vibration motor of the present invention is different from the prior art in which a smooth rotation is vibrated by an unbalanced weight, and the generated torque itself of the rotor assembly itself including the unbalanced element is unbalanced. Thus, vibration can be generated without difficulty. Further, since the vibration motor of the present invention constitutes an unbalanced element in the rotor assembly itself, the size and weight can be reduced as compared with a conventional vibration motor in which an unbalanced weight is added to the outside of the motor body. In addition, it is possible to increase the energy efficiency required for generating vibration, and it is particularly suitable for use in a portable device using a small secondary battery as a power source.

Further, the vibration motor of the present invention can obtain an unbalanced state of the rotor assembly itself by reducing the mass of a part of the component, the number of windings of the coil, the diameter of the winding, and the like. Mass and dimensions can be easily reduced. Since the number of parts does not increase, not only does the number of assembling steps not increase, but also there are many solutions that can reduce the number of steps. In addition, since there is no need to add an unbalanced weight to the rotating shaft outside the motor body, the overall length is shortened, and a very thin flat motor can be obtained depending on the application.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail based on embodiments with reference to the accompanying drawings. FIG. 1 is a schematic sectional view showing a basic configuration of an embodiment of a vibration motor to which the present invention is applied, FIG. 2 is a schematic front view of a rotor assembly of Embodiment 1, and FIG. 3 is a schematic front view of a rotor assembly of Embodiment 2. FIG. 4 is an explanatory view of a rotor coil according to the third embodiment.
FIG. 6 is a schematic front view of a rotor assembly according to a fourth embodiment, FIG. 6 is a schematic front view of a rotor assembly according to a fifth embodiment, FIG. 7 is an explanatory diagram of a rotor coil according to the fifth embodiment, and FIG. 9 is a schematic front view of a rotor assembly according to a seventh embodiment, FIG. 10 is a schematic front view of a rotor assembly having no unbalanced element, and FIG. 11 is a rotor having no unbalanced element. It is explanatory drawing of a coil.

First, an overall image of a vibration motor to which the present invention is applied will be described. As shown in FIG. 1, this vibration motor is roughly composed of a housing (stator) assembly 1, an end bracket assembly 6, and a rotor (rotor) assembly 13.

As shown in FIG. 1, the housing assembly 1 includes a cylindrical housing 2 having a bottom and made of a magnetic material, a ring-shaped magnet 3 installed on an inner peripheral surface of the housing 2, and a bottom portion of the housing 2. The center recess is composed of a bearing metal 4 fitted therein and a pivot bearing plate 5 disposed behind it.

As shown in FIG. 1, the end bracket assembly 6 has a pair of disc-shaped end brackets 7 formed so as to close the opening of the housing 2 and attached to the inner peripheral edge of the disc-shaped end bracket 7 with an insulator 8 interposed therebetween. Brush 9, a bearing metal 10 fitted in a recess in the center of the disc-shaped end bracket 7, and a pivot bearing plate 11 disposed behind the metal 9.
And a lead wire 12 for connecting to an external power supply (not shown).

As shown in FIG. 1, the rotor assembly 13 has a laminated core 14 disposed opposite to the ring-shaped magnet 3 of the housing assembly 1, and is fixed through the center of the laminated core 14. A rotating shaft 15; an insulating layer 16 covering the surface of the laminated core 14;
And a commutator 18 fixed to the surface of the rotating shaft 15 via an insulating material and connected to a wire end of the rotor coil 17. Have been. Here, since the rotating shaft 15 does not need to take out power, it does not protrude outside as an output shaft.

In the rotor assembly 13 described above, specifically, in the rotor assembly or the rotor coil of the embodiment described later, an unbalanced element such as an electric, mechanical or magnetic means, which is an unbalanced element, is provided. Elements are configured.

Although not an essential element of the present invention, in an actual motor, a non-linear resistor 19 for improving the commutation characteristics between the brush 9 and the commutator 18 and a leakage from the bearing metal 10 are provided. An oil drain 20 and the like for protecting the commutator 18 from the generated oil are appropriately added.

In the above-described vibration motor, a magnetic circuit is formed by the path of the laminated core 14, the ring-shaped magnet 3, and the magnetic metal housing 2. Here, when the lead wire 12 is connected to a power supply (not shown), an exciting current flows through the rotor coil 17 to generate a magnetic flux of a predetermined polarity, and this magnetic flux generates a torque in a desired direction by a magnetic action with the ring-shaped magnet 3. As a result, the rotor assembly rotates in a predetermined direction.
At this time, vibration occurs due to the unbalanced element formed in the rotor assembly 13.

Hereinafter, an embodiment of a rotor assembly having an unbalanced element incorporated in the vibration motor will be described.
Prior to the description, the rotor assembly 13g having no unbalanced element will be described.

As shown in FIG. 10, the laminated core 14 is point-symmetric with respect to the rotation axis 15 in each of the poles 14-1, 14-2, and 14-3, and has the poles 14-1 and 14-. Two, one
Both the cross-sectional area and the tip shape of 4-3 are balanced. Further, as shown in FIG. 11, the diameters and the number of turns of the windings constituting the coils 17-1, 17-2, 17-3 of the rotor coil 17 are also determined by the poles 14-1, 14-2, 14 -3, so-called equilibrium state. Thus, the rotor assembly 13g is electrically, mechanically and magnetically balanced, so that rotational power with less vibration is extracted.

The present invention incorporates an unbalanced element into one or more of the above elements of rotor assembly 13g in such a balanced state, ie, one or more of the electrical, mechanical and magnetic means. , To obtain rotation accompanied by vibration. A description will now be given of a rotor assembly according to an embodiment which is incorporated in the vibration motor having the basic configuration. The rotor assembly of the embodiment described below is an example applied to that of three magnetic poles, but is not limited to this. Further, the rotor assembly of the embodiment described below is one in which the specifications of one pole are mainly different from those of the other two poles, but the specifications of the two poles are simultaneously different, or each pole is different. All specifications can be different.

<Embodiment 1> As shown in FIG. 2, a rotor assembly 13a of this embodiment has two poles 14-2, 1
A plastic intercalator 21 filled and kneaded with a non-magnetic metal powder or other high specific gravity material is disposed and fixed between 4-3. This rotor assembly 13a
All other elements, ie, electrical or magnetic elements, are configured to maintain balance.

Thus, the rotor assembly 13a
The center of gravity moves outward from the axis of the rotating shaft 15 on one side of the interposed weight body 21, that is, the center of gravity is eccentric, and a mechanical unbalance element is inherent. Therefore, when the rotor assembly 13a is incorporated in the vibration motor, when the rotor assembly 13a is driven to rotate, a rotational movement of centrifugal force occurs due to mechanical imbalance caused by the interposed weight body 21, thereby causing vibration. Will occur.

In the rotor assembly 13a of the first embodiment, the basic structure can be manufactured in the same manner as that of the conventional one, and the degree of unbalance is determined by the material of the interposed weight body 21,
It is possible to arbitrarily adjust by changing the type or the filling amount of the high specific gravity substance to be filled. Therefore, the vibration motor incorporating the rotor assembly 13a has an advantage that a desired vibration state can be easily obtained.

The vibration motor incorporating the rotor assembly 13a according to the first embodiment does not have a semicircular unbalanced weight outside the motor body as in the prior art, and therefore does not need to be used. The rotating shaft 15 is not extended outside the motor body. Moreover, the only newly added element is the interposed weight body 21 which is inserted and fixed between the two poles 14-2 and 14-3 of the rotor assembly 13a. There is no reason to expand. Therefore, the vibration motor incorporating the rotor assembly 13a according to the first embodiment can be reduced in size at least because there is no semicircular unbalanced weight outside the main body.

Further, as described above, since the semicircular unbalanced weight is not attached to the outside, in equipments equipped with the vibration motor, it is necessary to avoid contact with the vibration area around the rotation area. There is no need to make room. Therefore, according to the vibration motor incorporating the rotor assembly 13a of the first embodiment, it is convenient to equip a small portable device such as a mobile phone.

Further, in the vibration motor incorporating the rotor assembly 13a of the first embodiment, an unbalanced weight is not added to the outside of the two bearing metals 4 and 10 on the rotating shaft 15, but to the inside thereof. The vibration caused by the rotational movement of the centrifugal force during its rotation is transmitted to both bearing metals 4 and 10 on average, and is transmitted to both sides in an enlarged manner. There is no. Therefore, a sufficiently long life can be achieved without using a strong bearing or a rotating shaft as required in this type of conventional vibration motor.

Furthermore, the vibration motor provided with the rotor assembly according to the first embodiment does not require the semicircular unbalanced weight used in the conventional motor of this type, and is therefore manufactured in the same manner. In this case, the step of press-fitting the rotary shaft 15 into the rotary shaft 15 is eliminated, so that there is no danger that the pivot bearing plate 5 or 11 with which the other end of the rotary shaft 15 abuts is damaged by the pressure applied at the time of press-fitting. Needless to say, there is no need to increase the strength.

In addition, the rotor assembly 13a of the first embodiment
The vibration motor provided with is compared with the conventional vibration motor provided with the semicircular unbalanced weight, and the only additional element is the interposed weight body 21, and the other is removed. The elements include the semicircular unbalanced weight and the protruding portion of the rotating shaft 15 to the outside of the motor body. Further, the bearing metal 4, 10 can be replaced with an existing one having lower strength or the like.
And pivot bearing plates 5 and 11.

Accordingly, in the manufacture thereof, the number of steps is slightly reduced and the parts can be replaced with inexpensive ones, so that the manufacturing cost can be considerably reduced as a whole.

<Embodiment 2> As shown in FIG. 3, a rotor assembly 13b according to this embodiment has a pole piece of a laminated core 14 having one pole 14-1 and a cavity 22 opened to the outer periphery side. It is. The rotor assembly 13b is configured so as to keep the balance of all other elements.

Thus, this rotor assembly 13b
The center of gravity is eccentric to the outside of the axis of the rotating shaft 15, that is, by the amount of mass reduction due to the cavity 22, and is eccentric in the opposite direction, so that a mechanical unbalance element is present. In addition to this,
In the rotor assembly 13b, the effective surface area of the portion of the laminated core 14 facing the ring-shaped magnet 3 is reduced, so that the magnetic core becomes unbalanced. Therefore, when the rotor assembly 13b is incorporated in the vibration motor, when the rotor assembly 13b is driven to rotate, a rotational movement of centrifugal force occurs due to a mechanical imbalance and a magnetic imbalance caused by the cavity 22. Will occur.

In the rotor assembly 13b of the second embodiment, the basic structure can be manufactured in the same manner as that of the conventional one, and the degree of mechanical and magnetic imbalance changes the size of the cavity 22. This makes it possible to arbitrarily adjust. Therefore, the vibration motor incorporating the rotor assembly 13b has an advantage that a desired vibration state can be easily obtained.

The vibration motor incorporating the rotor assembly 13b according to the second embodiment can be miniaturized for the same reason as the vibration motor incorporating the rotor assembly 13 according to the first embodiment. A long service life can be obtained without using a specially high-strength material for 5 and 11.

In addition, the rotor assembly 13b of the second embodiment
The vibration motor provided with the above has only the cavity 22 as an additional element as compared with the conventional vibration motor provided with the semi-circular unbalanced weight, and this means that it is added. It is also added as a configuration, and is omitted in manufacturing. On the other hand, the other unremoved elements include the semicircular unbalanced weight and the protruding portion of the rotating shaft 15 protruding outside the motor body. The bearing metals 4 and 10 and the pivot bearing plates 5 and 11 which can be replaced with existing ones having lower strength and the like are provided.

Therefore, in the manufacture thereof, the man-hour is slightly reduced, the number of parts is reduced, and some of the parts can be replaced with inexpensive ones, so that the manufacturing cost can be considerably reduced as a whole.

<Embodiment 3> As shown in FIG. 4, the rotor assembly 13 of this embodiment is configured such that the number of turns of one pole coil 17-1 in the rotor coil 17 is changed to that of the other two pole coils 17a.
-2, 17-3. The rotor assembly 13 including the rotor coil 17 is
All other elements are configured to be balanced.

Thus, this rotor assembly 13
The different amperage and winding resistance of the pole coil 17-1 will result in electrical and magnetic imbalances, and a shorter overall length of the coil wire, thus reducing the mass of that location. As a result, it becomes mechanically unbalanced. Therefore, when the rotor assembly 13 provided with the rotor coil 17 is incorporated in the vibration motor, when the rotor is driven to rotate, the combined unbalanced element included in the rotor assembly 13 is present. , Vibration will occur.

In the rotor assembly 13 of the third embodiment, the structure excluding the rotor coil 17 can be manufactured in the same manner as the conventional one, and the degree of electrical, magnetic and mechanical unbalance is determined by the rotation It is possible to arbitrarily adjust the degree of reduction in the number of amps of the coil 17-1 at the corresponding portion of the child coil 17 by variously changing it. Therefore, the vibration motor incorporating the rotor assembly 13 has an advantage that a desired vibration state can be easily obtained.

The vibration motor having the rotor coil 17 of the third embodiment can be made compact for the same reason as the vibration motor incorporating the rotor assembly 13a of the first embodiment.
The service life is sufficiently long without using specially strong materials for the bearing metals 4 and 10 and the pivot bearing plates 5 and 11.

In addition, the vibration motor having the rotor coil 17 according to the third embodiment has no particular additional elements compared to the conventional vibration motor having the semicircular unbalanced weight. 17, the number of amps of the coil 17-1 is reduced, and the semicircular unbalanced weight and the rotating shaft 15 are reduced.
Of the present invention is removed, and the bearing metals 4, 10 and the pivot bearing plates 5, 11 can be changed to those having lower strength than the conventional one.

Therefore, in the manufacture thereof, the number of steps is slightly reduced, the number of parts is reduced, and some of the parts can be replaced with inexpensive ones, so that the manufacturing cost can be considerably reduced as a whole.

In contrast to the rotor coil 17 of the third embodiment, the number of windings of a part of the coil is increased, a thin wire is used, and a thick wire is used. , A plurality of conductors can be wound in parallel, and the like can be adopted. By appropriately combining them, the unbalanced state can be variously changed, and a desired result can be obtained.

<Embodiment 4> As shown in FIG. 5, a rotor assembly 13c of this embodiment has a small diameter as a conductor constituting a coil 17-1 of one pole 14-1 of the rotor assembly. Is adopted. Therefore, as shown in the figure, the winding occupation space of the coil 17-1 is changed to the coils 17-2, 17- in the other poles 14-2, 14-3.
2 is smaller than the two-dot chain line that indicates the same space as the solid line. Other elements are configured to maintain balance.

Thus, this rotor assembly 13c
The winding diameter of the coil 17-1 of the one pole 14-1 is small,
Therefore, the space occupied by the winding becomes small, and in part, the winding resistance becomes large, resulting in electrical and magnetic imbalance. Moving. Therefore, this rotor assembly 1
When the vibration motor provided with 3c is driven to rotate, vibration is generated due to the presence of the composite unbalanced element existing in the rotor assembly 13c.

In the rotor assembly 13c of the fourth embodiment, the structure of the rotor assembly 13c except for the single pole 14-1 coil 17-1 can be manufactured in the same manner as the conventional one, and its electrical, magnetic, and mechanical The degree of unbalance is determined by the coil 17
It is possible to arbitrarily adjust by changing the degree of decrease of the wire diameter of −1 in various ways. Therefore, the vibration motor incorporating the rotor assembly 13c has an advantage that a desired vibration state can be easily obtained.

The vibration motor provided with the rotor assembly 13c according to the fourth embodiment is different from the rotor motor 13 according to the first embodiment.
For the same reason as the vibration motor incorporating the a, the motor can be made compact, and the life is sufficiently long without using specially high-strength bearing metals 4, 10 and pivot bearing plates 5, 11.

In addition, the rotor assembly 13c of the fourth embodiment
The vibration motor provided with, compared to the conventional vibration motor having the semicircular unbalanced weight, there is no particular element to add,
The wire diameter of the coil 17-1 is reduced, and the semicircular unbalanced weight and the protruding portion of the rotating shaft 15 protruding outside the motor main body are removed, and the bearing metals 4, 10 and the pivot bearing plate 5, Numeral 11 indicates that the strength can be changed to a lower strength.

Therefore, in the manufacture thereof, the number of steps is slightly reduced, the number of parts is reduced, and some of the parts can be replaced with inexpensive ones. it can.

<Embodiment 5> The rotor assembly 13d of this embodiment has a structure in which a coil normally used for one pole 14-1 of the rotor assembly is removed, as shown in FIGS. Other elements are configured in a balanced state.

Thus, the rotor assembly 13d is
Since the coil which should be in the one pole 14-1 is removed, it becomes extremely unbalanced electrically and magnetically, and since the mass is reduced by the amount of the coil, it becomes mechanically unbalanced. Has become. Therefore, the rotor assembly 13
When the vibration motor provided with d is driven to rotate, vibration is generated due to the presence of the composite unbalanced element inherent in the rotor assembly 13d.

The vibration motor provided with the rotor assembly 13d of the fifth embodiment is the same as that of the first embodiment.
For the same reason as the vibration motor incorporating a, it can be made compact, and it is not necessary to use particularly high-strength bearing metals 4, 10 and pivot bearing plates 5, 11.

In addition, the rotor assembly 13d of the fifth embodiment
The vibration motor provided with, compared to the conventional vibration motor having the semicircular unbalanced weight, there is no particular element to add,
Removing a part of the coil, and on the other hand, removing the semicircular unbalanced weight and the protruding part of the rotating shaft 15 outside the motor body,
Further, the bearing metals 4, 10 and the pivot bearing plates 5, 1
1 can be changed to one having lower strength than the conventional one.

Therefore, in the manufacture thereof, the number of steps is slightly reduced, the number of parts is reduced, and some of the parts can be replaced with inexpensive ones. it can.

<Embodiment 6> As shown in FIG. 8, a rotor assembly 13e of this embodiment has both pole piece extensions A and B extending on both sides in the rotation direction at one pole 14-1. It has been removed. Other elements are configured to maintain balance.

Thus, this rotor assembly 13e
Since the extension portions A and B of the pole piece of the one pole 14-1 have been removed, a magnetic and mechanical unbalance state has occurred.
That is, when the extension portions A and B of the pole pieces are deleted, as shown in FIG. 1, the magnetic flux distribution between the facing ring-shaped magnet 3 and the other poles 14-2 and 14-3 is smaller than that of the other poles 14-2 and 14-3. The unbalance causes a magnetic unbalance, and at the same time, the mass of the pole 14-1 also decreases, resulting in a mechanical unbalance and a shift of the center of gravity. Therefore, when the vibration motor provided with the rotor assembly 13e is driven to rotate, vibration is generated due to the presence of the composite unbalanced element inherent in the rotor assembly 13e.

The vibration motor provided with the rotor assembly 13e according to the sixth embodiment has no additional elements in comparison with the conventional vibration motor provided with the semicircular unbalanced weight.
The extensions A and B of the pole piece are removed, and the semi-circular unbalanced weight and the rotating shaft 15 are formed similarly to the first embodiment.
In addition, the protruding portion of the motor body outside is also removed, and the bearing metals 4, 10 and the pivot bearing plates 5, 11 can be changed to those having lower strength than the conventional one.

Therefore, in the manufacture thereof, the number of steps is slightly reduced, the number of parts is reduced, and some of the parts can be replaced with inexpensive ones, so that the manufacturing cost can be considerably reduced as a whole. In addition, the third embodiment has the same functions and effects as the first embodiment.

When one of the extension portions A and B of the pole piece is omitted, the state of magnetic and mechanical unbalance changes from that of the sixth embodiment. Therefore, by selecting one as needed, the unbalanced state can be changed, and the change in the vibration state corresponding thereto can be ensured.

<Embodiment 7> As shown in FIG. 9, the rotor assembly 13f of this embodiment has one pole 14-1 except for the entire pole piece except for the legs, and additionally has the same pole 14-. The coil which should have been wound around the leg of the first leg is also removed. Other elements are configured to maintain balance.

Thus, the rotor assembly 13f is
Since the entire pole piece of the pole 14-1 has been removed, a magnetic and mechanical imbalance occurs and the pole 14-1
The coil to be wound on one leg has also been removed, creating an electrical, magnetic and mechanical imbalance. That is, when the entire pole piece is removed, the magnetic flux distribution between the ring magnet 3 and the ring magnet 3 becomes extremely unbalanced as compared with the other poles, and magnetic unbalance occurs. 1 is also reduced, so that it becomes mechanically unbalanced. Further, since the coil is removed, no magnetic field is generated and the mass is lost due to the absence of the coil. Therefore, electric, magnetic, and mechanical Will be unbalanced.

Therefore, when the vibration motor provided with the rotor assembly 13f is driven to rotate, a large vibration is generated due to the presence of the composite unbalanced element inherent in the rotor assembly 13f. .

The vibration motor provided with the rotor assembly 13f according to the seventh embodiment has no particular additional elements as compared with the conventional vibration motor provided with the semicircular unbalanced weight.
While removing the pole piece and the coil, the embodiment 1
Similarly, the semicircular unbalanced weight and the protruding portion of the rotating shaft 15 protruding outside the motor body are also removed, and the bearing metals 4, 10 and the pivot bearing plates 5, 11 are reduced in strength compared to the conventional one. It can be changed to something.

Therefore, in the manufacture thereof, the number of steps is slightly reduced, the number of parts is reduced, and some of the parts can be replaced with inexpensive ones, so that the manufacturing cost can be considerably reduced as a whole. In addition, the third embodiment has the same functions and effects as the first embodiment.

[0069]

According to the vibration motor of the present invention,
Due to the action of the unbalanced element formed by mechanical, magnetic or electrical means or a combination of these, an unbalanced torque is generated in the rotor assembly in principle, which necessarily involves vibration. Will rotate. That is,
According to the vibration motor of the present invention, elements that contribute to the generation of torque of the motor are electrically or magnetically unbalanced (asymmetric), or the center of gravity of the rotor assembly is displaced from the rotation axis to be mechanically unbalanced. By doing so, vibration is generated during the rotation.

The vibration generated by the vibration motor of the present invention is different from the prior art in which smooth rotation is vibrated by an unbalanced weight, and the generated torque itself of the rotor assembly itself including the unbalanced element is unbalanced. Thus, vibration can be generated without difficulty. Further, since the vibration motor of the present invention constitutes an unbalanced element in the rotor assembly itself, the size and weight can be easily reduced as compared with the conventional vibration motor in which an unbalanced weight is added to the outside of the motor body. In addition, it is also possible to increase the energy efficiency required for generating vibration, and it is particularly suitable for use in a portable device that uses a small secondary battery as a power source.

Further, the vibration motor of the present invention can obtain an unbalanced state of the rotor itself by reducing the mass of a part of the parts, the number of windings of the coil, the winding diameter, and the like. And the size can be easily reduced. Since the number of parts does not increase, not only does the number of assembling steps not increase, but also there are many solutions that can reduce the number of steps. In addition, since there is no need to add an unbalanced weight to the rotating shaft outside the motor body, the overall length is shortened, and a very thin flat motor can be obtained depending on the application.

Further, in the vibration motor of the present invention, since the vibration generated in the rotor assembly itself is supported by the two bearings, there is no loss and the life of the device is extended.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a basic configuration of an embodiment of a vibration motor to which the present invention is applied.

FIG. 2 is a schematic front view of the rotor assembly according to the first embodiment.

FIG. 3 is a schematic front view of a rotor assembly according to a second embodiment.

FIG. 4 is an explanatory diagram of a rotor coil according to a third embodiment.

FIG. 5 is a schematic front view of a rotor assembly according to a fourth embodiment.

FIG. 6 is a schematic front view of a rotor assembly according to a fifth embodiment.

FIG. 7 is an explanatory diagram of a rotor coil according to a fifth embodiment.

FIG. 8 is a schematic front view of a rotor assembly according to a sixth embodiment.

FIG. 9 is a schematic front view of a rotor assembly according to a seventh embodiment.

FIG. 10 is a schematic front view of a rotor assembly having no unbalanced elements.

FIG. 11 is an explanatory view of a rotor coil having no unbalanced element.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Housing assembly 2 Housing 3 Ring magnet 4 Bearing metal 5 Pivot bearing plate 6 End bracket assembly 7 Disc-shaped end bracket 8 Insulator 9 Brush 10 Bearing metal 11 Pivot bearing plate 12 Lead wire 13, 13a, 13b, 13c, 13e , 13f, 13
g Rotor assembly 14 Laminated core 14-1, 14-2, 14-3 Pole 15 Rotation axis 16 Insulation layer 17 Rotor coil 17-1, 17-2, 17-3 Coil 18 Commutator 19 Nonlinear resistor 20 Oil Cutting 21 interpolated body 22 cavity

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D107 AA12 AA13 BB08 CC09 DD08 DD09 5H607 BB01 BB04 BB14 CC01 DD17 EE40 GG09 JJ07 5H623 AA10 BB07 GG16 HH04 LL14

Claims (7)

[Claims] 1. A housing assembly comprising a cylindrical housing, a ring magnet disposed on an inner peripheral surface thereof, and a bearing metal disposed at a center of a bottom of the cylindrical housing, and an opening of the cylindrical housing is closed. A stator assembly is constituted by a disc-shaped end bracket, a pair of brushes fixed to the side surfaces thereof via an insulator, and an end bracket assembly comprising a bearing metal disposed at the center of the disc-shaped end bracket. A rotating shaft rotatably supported by a bearing metal, a laminated core externally fixed to the rotating shaft facing the ring-shaped magnet, a rotor coil formed by winding a conductor around the laminated core, and a surface of the rotating shaft. In a vibration motor in which a rotor assembly is constituted by a fixed commutator, the rotor assembly itself Mechanical means, the vibration motor with one or unbalanced element according means combining two or more magnetic means or electrical means. 2. The vibration motor according to claim 1, wherein said unbalanced element is constituted by an interposed weight body additionally disposed between poles of said rotor assembly. 3. The vibration motor according to claim 1, wherein the unbalanced element is constituted by a cavity opening on the outer surface of the laminated core facing the ring-shaped magnet at the pole of the rotor assembly. 4. The vibration motor according to claim 1, wherein said unbalanced element is configured by changing a specification of at least one pole coil of said rotor assembly. 5. The vibration motor of claim 1 wherein said unbalanced element is constructed by removing a single pole coil of said rotor assembly. 6. The vibration motor according to claim 1, wherein said unbalanced element is constituted by removing at least a part of a pole piece of a single pole core of said rotor assembly. 7. The rotor of claim 1 wherein the unbalanced element is constructed by removing at least a portion of a pole piece of a single pole core of the rotor assembly and removing a coil of the pole.
Vibration motor.