KR20030087988A - Vibration motor - Google Patents

Abstract

(Problem) A vibration motor can be obtained in which a sufficient amount of vibration can be obtained, and also a high degree of freedom of mounting space for the equipment to be mounted, and also sufficient strength against impact.

(Solution means) The upper end portion of the stator yoke 3 having the ring-shaped magnet 5 on its outer periphery is fixed to the top plate of the cylindrical housing 2 fixed on the base 1, and the upper end portion is fixed to the stator yoke. The lower end of the fixed shaft 4 to which the shaft is fixed is fixed to the base, and the lower part is a cylindrical portion 7a serving as a commutator 11, a flange portion 7b provided on the cylindrical portion, and an upper portion from the outer peripheral portion of the flange portion. In the support body 7 which consists of several support protrusions 7c which protrude, the core 8 which has several extreme values inside the ring-shaped main-body part, and the core 8 which attached the eccentric weight 13 to the outer periphery part is adjacent between the extreme values which adjoin. The support protrusion of the said support body was inserted, the core was mounted, and the support body 7 was rotatably installed around the fixed shaft 4.

Description

Vibration Motors {VIBRATION MOTOR}

The present invention relates to a small vibration motor having an eccentric weight and suitable for calling a vibrator of a small telephone such as a mobile telephone or a personal handyphone system (PHS).

BACKGROUND ART Vibrating motors having eccentric weights have various structures conventionally.

In recent years, in a small telephone such as a mobile phone or a PHS, as a means of informing an incoming call without ringing a ringing tone, instead of installing a small vibration motor in the telephone and ringing the ringing ring tone, the oscillating motor is driven to vibrate the phone itself. There is a call to notify the user. The function of such a telephone is a vibration function, which is installed in almost all small telephones.

The vibration motor generally used conventionally for the above-mentioned uses is as shown in FIG. 9, and the eccentric weight 33 is attached to the front-end | tip of the rotating shaft 32 drawn out from the motor main body 31. As shown in FIG.

Since such a vibrating motor is housed in a mobile telephone or the like, which is further miniaturized in recent years, an extremely small one having a diameter of about 6 mm and a length of about 12 mm is used, and the diameter of the rotating shaft 32 is As for 0.7 mm and the eccentric weight 33, about 0.5-0.7 g in weight is generally used.

However, since the eccentric weight 33 is provided outside the motor main body 31, the conventional vibrating motor described above does not allow the eccentric weight to come into contact with other constituent members such as an electronic circuit inside the telephone. Since there is a need to mount at a sufficient interval there is a problem that the degree of freedom of the mounting position is low.

In addition to the small size as described above, the eccentric motor used in the small telephone is also required to have sufficient strength against dropping impacts.

However, since the eccentric weight 33 is provided at the tip of the thin rotary shaft 32 having a diameter of about 0.7 mm, the conventional technique described above is applied from the motor main body 31 when a radial shock is applied to the rotary shaft 32. The force caused by the impact is concentrated at the base of the portion to be drawn out, and it is easy to bend at this portion, and the problem arises that the eccentric weight is in contact with the peripheral member in the telephone and cannot be rotated.

In particular, when the amount of eccentricity and weight of the eccentric weight are increased for the purpose of increasing the amount of vibration (intensity of vibration), the force applied to the rotating shaft at the time of falling is further increased, and the strength against drop impact is lowered.

In addition to the above-mentioned small-sized telephone, the vibration motor generates a predetermined vibration in a measuring instrument such as an industrial test apparatus, uses as a vibration generating source for virtual reality experience in a game machine, or as a massage vibration generating source for a small massager. Also in such a use purpose, the impact resistance and further miniaturization are desired in the same manner as the vibration motor for the small telephone described above.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vibration motor capable of obtaining a sufficient amount of vibration, having a high degree of freedom in mounting space for a mounted device such as a small telephone, and having sufficient strength against impact.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal front view which shows 1st Example of the vibration motor which concerns on this invention.

FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1. FIG.

3 is a vertical front view showing a second embodiment of the vibration motor according to the present invention;

4 is a cross-sectional view taken along line IV-IV of FIG. 3.

5 is a vertical front view showing a third embodiment of the vibration motor according to the present invention.

6 is a vertical front view showing a fourth embodiment of the vibration motor according to the present invention.

FIG. 7 is a cross sectional view taken along line VII-VII of FIG. 6. FIG.

8 is a longitudinal perspective view of a bearing sleeve;

9 is a perspective view showing an example of a conventional vibration motor.

Explanation of symbols on the main parts of the drawings

1: base 2: housing

3: Stator yoke 4: fixed shaft

5: magnet 6: base

7: support 8: core

9: protective member 10: coil

11: commutator 12: brush

13: weight 14: runner

15: terminal 16a, 16b: weight

17: stator yoke 18: support

19: Stator York 20: Thruster

21: bearing sleeve 22: rotating shaft

23: support 24: dynamic pressure groove

In order to achieve the above object, in the vibration motor according to claim 1 of the present invention, a cylindrical housing having a top plate but having an open bottom is fixed on a base, and magnetized in a radial direction to the top plate of the housing. The upper end of the stator yoke having the ring-shaped magnet on its outer periphery is fixed, and the upper end is inserted into the vertical hole opened in the center of the stator yoke, and the fixed shaft lower end is fixed to the base, and the lower part serves as a commutator. A plurality of extreme values in which the inner side faces the outer circumferential surface of the magnet, on a support including a portion, a flange portion directed outwardly from the cylindrical portion, and a plurality of support protrusions projecting upward from the outer peripheral portion of the flange portion. ) Inside the main body of the ring shape, the coil is wound around the leg of each extreme value, and the core with the eccentric weight mounted on the outer periphery is Put between the extremes of fit to the supporting protrusions of the support equipped with the core, and will have a commutator at the bottom of the supporting member pivotally mounted to the support around a fixed shaft so as to be in contact with a brush mounted on the base.

In the vibration motor according to claim 2 of the present invention, the stator yoke is formed in a cylindrical shape in which a lower part is opened, and the upper part of the cylindrical part of the support faces the stator yoke.

In the vibration motor according to claim 3 of the present invention, the lower end of the fixed shaft is fitted into a central concave portion formed on an upper surface of a cylindrical seat having an outer circumferential flange at an upper portion thereof, and the lower seat of the seat is fixed to a base. The pedestal is fixed to the base such that the pedestal is opened in the center hole so that the inner diameter is larger than the outer diameter of the pedestal bottom.

The vibration motor according to claim 4 of the present invention forms a large inner diameter portion on the inner surface of the cylindrical portion of the support having a larger inner diameter than the upper and lower portions, and provides an oil collection portion between the fixed shaft and the cylindrical portion.

In the vibration motor according to claim 5 of the present invention, the horizontal plane passing through the center of the magnet is located above the horizontal plane passing through the center of the core, and the core is always sucked upward by the magnetic force of the magnet.

In the vibration motor according to claim 6 of the present invention, the cylindrical housing having a top plate but having a bottom opening is fixed on the base, and a ring-shaped magnet magnetized in a radial direction, the top of which is closed on the top of the housing but closed at the bottom. The upper end of the stator yoke provided on the outer periphery, a cylindrical bearing sleeve is fitted and fixed in the stator yoke, the cylindrical portion serving as a commutator in the lower portion, the flange portion facing outward from the cylindrical portion, and The support body consisting of a plurality of support protrusions projecting upwardly from the outer periphery of the flange portion is fixed around the axis of rotation, and the inner side has a plurality of extreme values opposed to the outer peripheral surface of the magnet inside the ring-shaped main body portion, Coils are wound around the legs and cores with eccentric weights on the outer periphery The support protrusion of the support is inserted to mount the core to the support, and the upper part of the rotating shaft is rotatably mounted in the bearing sleeve so that the commutator at the bottom of the support contacts the brush provided on the base.

The vibration motor according to claim 7 of the present invention forms a dynamic pressure groove in an inner surface of the bearing sleeve.

In the vibration motor according to claim 8 of the present invention, the eccentric weight is mounted on the core such that at least a portion thereof overlaps the upper and lower surfaces of the ring-shaped main body of the core.

The first embodiment of the vibration motor according to the present invention comprises the housing with a material having a slightly elasticity and a thickness. When the housing is subjected to an impact from the outside, the housing is elastically deformed to contact the upper end surface of the weight, and the impact applied to the weight is Dispersed in the housing is configured to mitigate the impact.

In a second embodiment, the housing is made of stainless steel having a thickness of 0.10 to 0.15 mm.

In the third embodiment, the clearance gap α between the lower end of the cylindrical portion and the base upper surface of the support and the clearance gap β between the lower surface of the weight and the upper surface of the base are set to almost the same dimensions, and the thrust impact is applied to the weight. The bottom surface of the ground weight and the bottom surface of the support are configured to be in contact with the base upper surface at the same time to distribute the impact.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of the vibration motor which concerns on this invention is described in detail with reference to the specific example shown in an accompanying drawing.

Reference numeral 1 denotes a base, 2 denotes a housing, and an upper end of the stator yoke 3 is caulked in a hole 2b opened in the center of the top plate 2a of the housing 2 formed in a cylindrical shape with a lower portion opened. have.

The stator yoke 3 is formed in a cylindrical shape in which the lower part is opened, and the upper end of the fixed shaft 4 is fixed in the vertical hole 3a opened at the center of the government by press-fitting or bonding, and the outer periphery of the stator yoke. The ring-shaped magnet 5 was attached to the magnet, and the magnet was magnetized in the radial direction.

A base 6 is provided at the lower end of the fixed shaft 4, and the lower base of the fixed shaft is fitted into the central recess 6a formed on the upper surface of the fixed shaft 4, and the lower surface of the outer circumferential flange 6b is fixed to the base. It is supported by the upper surface of the stepped portion 1b formed on the upper inner circumferential surface of the central hole 1a, and is fixed to the stepped portion through an adhesive.

In addition, the pedestal 6 formed an appropriate clearance between the outer periphery of the pedestal 6c and the inner periphery of the center hole 1a of the base so that the pedestal 6 could move in the horizontal direction before adhesion to the stepped portion, and after the alignment of the fixed shaft 4 was performed, It is comprised so that a fixed shaft may be installed correctly with respect to a base by fixing a base to a step part by means of adhesion | attachment.

And on the outer periphery between the stator yoke 3 and the pedestal 6 of the fixed shaft 4, the support 7 is rotatably provided around the fixed shaft, and the upper portion of the cylindrical portion 7a of the support is placed on the stator yoke ( 3) The support body has a flange portion 7b on the outer circumference of the central portion of the axial direction of the cylindrical portion 7a, and a plurality of support protrusions 7c, 7c protruding upward from the outer peripheral portion of the flange portion are formed. The cylindrical part, the flange part, and the support protrusion were integrally formed of the same material by synthetic resin materials such as polyphenylene sulfide, for example.

In the central portion in the axial direction in the inner surface of the cylindrical portion 7a, a large inner diameter portion 7d having a larger inner diameter than the upper and lower portions of the inner surface of the cylindrical portion is formed, and the large inner diameter portion is formed between the fixed shaft 4 and the oil. It functions as a collection part, and the rotation of the support body 7 with respect to the fixed shaft 4 is made smoother.

The upper support 7 supports the inner periphery of the core 8, which protrudes inward from the inside of the ring-shaped core main body 8a, and the inner side faces the outer circumferential surface of the magnet 5. Has extreme values 8b and 8b.

The support protrusions 7c and 7c of the support 7 are sandwiched between the extremes 8b and 8b where the core 8 is adjacent and the inner circumferential surface of the core main body 8a. The support protrusions support the support protrusions 7c and 7c. Alignment of the core with respect to the arrangement is made and also to support the core together with the flange portion.

The core 8 is formed of, for example, a silicon steel sheet, and at least around the upper and lower surfaces and the leg portions of the extremities, for example, a protective member 9 made of a synthetic resin material such as polybutylene terephthalate is formed by mold molding, and each extreme value is formed. The coil 10 was wound around the leg part of 8b, and it was comprised so that the winding of a coil may not directly contact a core.

The winding end of the coil 10 is connected to a commutator 11 provided below the cylindrical portion 7a of the support 7, and the commutator is provided so as to contact the brush 12 provided on the base 1. have.

In addition, an outer circumferential portion of the core 8 is equipped with an eccentric weight and a weight 13, which is made of, for example, tungsten, and a groove 13a formed in the longitudinal direction of the inner circumferential surface is inserted in the outer circumferential portion of the core. It was fixed with an adhesive or the like accordingly. In this way, when grooves are formed in the weight and fitted to the core, the weight overlaps the upper and lower surfaces of the core by the depth of the groove, so that the radius of rotation of the weight can be made smaller than when the weightless groove is mounted on the outer periphery of the core. The vibration motor can be miniaturized.

The core 8 is positioned below the magnet 5 in the axial direction, and more specifically, the horizontal plane CP passing through the center of the core through a horizontal plane MP passing through the center of the magnet 5. It is located above, and the core is always sucked upward by the magnetic force of the magnet.

Therefore, the support body rotates in the state where the upper end of the cylindrical part 7a abuts the runner 14, and there exists a clearance gap between the lower end of a cylindrical part and a base, and a cylindrical lower end does not contact the upper surface of a base in normal use, There is an advantage that a vibration motor having a long life can be realized without the risk of damage or wear caused by contact between the lower end of the cylindrical portion and the upper surface of the seat.

Reference numeral 14 denotes a ring-shaped runner made of a low friction coefficient synthetic resin material interposed between the upper end surface of the cylindrical portion 7a and the inner surface of the stator yoke 3, and 15 is connected to the brush 12. And the terminals drawn out of the housing 2.

The vibrating motor of the present invention configured as described above is energized to the coil 10 via the brush 12 and the commutator 11 when the driving current is supplied to the terminal 15, and is generated at the extreme value of the core 8. The core is rotated and driven around the fixed shaft 4 together with the support 7 and the weight 13 by the magnetic attraction and the repulsive force between the magnet 5 and the eccentric rotation of the weight 13. Vibration is generated.

When the vibrating motor is impacted by a drop or the like, the fixed shaft 4 has a short shaft length, and both ends thereof are supported by the stator yoke 3 and the pedestal 6 so that the support 7 is provided between the support portions at both ends. The impact force is concentrated on a part of the rotating shaft, and there is no fear of damaging the rotating shaft.

Moreover, since the upper part of the cylindrical part 7a faces inside in the lower part of the opening part of the stator yoke 3, and the contact length in the axial direction of the support body and the rotating shaft was enlarged, the support body 7 is applied from the support body to the rotating shaft. Since the force is sufficiently dispersed and the horizontal plane passing through the center of the weight passes through the upper portion of the cylindrical portion 7a of the support, the radial direction component of the force applied to the weight by drop impact is applied to the upper portion of the cylindrical portion. Twisting is unlikely to occur, and therefore the strength against the impact force in the radial direction is large.

In addition, the vibration motor of the present embodiment has a gap between the lower end face of the cylindrical portion of the support 7 and the upper end face of the pedestal 6 and the interval between the lower end face of the weight 13 and the upper end face of the base 1. In the case where the weight 13 and the support 7 are moved downward by the thrust direction component of the drop impact force, the dimensions of β are almost the same, and the bottom face of the weight and the bottom face of the support are substantially simultaneously at the base 1 Contact with the upper surface of the C) to disperse the impact.

In addition, since the core 8 is magnetically attracted by the magnet 5 even when the motor is stopped, the gap α between the lower end surface of the support 7 and the upper end surface of the pedestal 6 is controlled to rotate and stop the motor. Regardless of whether it is always constant

In addition, the housing 2 is made of thin stainless steel (for example, SUS 303) having a thickness of about 0.10 to 0.15 mm so that the housing 2 is slightly elastic, and when the shock is applied to the vibration motor, the housing 2 is slightly deformed and the weight 13 In contact with the upper end surface of the structure, the load applied to the weight was received by the housing to mitigate the impact from the weight to the support. If the thickness of the housing is less than 0.10 mm, the support of the stator yoke by the housing may become unstable, and if it is larger than 0.15 mm, the above-mentioned shock alleviating effect is not sufficiently obtained.

Therefore, sufficient strength is obtained also with respect to the impact force in the thrust direction.

Next, the manufacturing process of the vibration motor of the above-mentioned embodiment is demonstrated.

First, the coil 10 is wound around the leg portion of each extreme value 8b of the core 8 in which the protection member 9 is molded in advance, and the support is supported between the adjacent extreme values 8b and 8b and the core body part 8a. The support protrusion 7c of (7) is inserted, and the outer periphery of the flange part 7b abuts on the inner periphery lower side of the core 8 to adhesively fix between the support protrusion and the core.

Then, after connecting the winding end of the coil 10 to the commutator 11, the groove 13a of the weight is fitted to the outer periphery of the core 8 to be adhesively fixed.

By the above process, the rotating member which consists of a support body 7, the core 8, and the weight 13 is produced.

Apart from the above-described manufacturing process of the rotating member, the stator yoke 3 is caulked and fixed in the center hole 2b of the housing 2, and the magnet 5 is fixed to the outer circumferential surface of the stator yoke through adhesion. The upper end of the fixed shaft 4 is fixed in the longitudinal hole 3a of the stator yoke by press fitting or adhesion.

And the runner 14 is loosely fitted to the fixed shaft 4 at the lower end side, and the cylindrical part 7a of the support body 7 which mounted the core 8 and the weight 13 previously by the above-mentioned process is fixed. After fitting to the shaft 4, the center concave portion 6a of the base 6 is fixed to the lower end of the fixed shaft 4 by pressing or bonding.

Next, the base 1 is mounted in its center hole 1a so that the base seat 6c faces, and in this state, the lower end of the housing 2 is caulked from the outside, and further around the base 1 through the adhesive. Fix it to

Then, an adhesive agent flows and hardens between the small diameter part 6c of the base 6 and the inner surface of the center hole 1a of the base. By doing so, an error in the horizontal direction occurs in the mounting position of the stator yoke 3 supporting the upper end of the fixed shaft 4 with respect to the housing 2 or the mounting position with respect to the base 1 of the housing 2. Even if the upper end position of the fixed shaft 4 is shifted due to such an error, the horizontal position of the base 6 supporting the lower end of the fixed shaft in response to the shift of the upper position of the fixed shaft is within the center hole 1a of the base. Since it moves, there is no possibility that an inclination may arise in a fixed shaft by the mounting error at the time of manufacture.

Therefore, the generation of defective products due to the mounting error at the time of manufacture such that the rotating member contacts the housing or the base due to the inclination of the fixed shaft is almost eliminated, and the product yield can be improved.

Moreover, it is suitable to use the adhesive agent of the ultraviolet curing type or the mixing agent type which can be hardened | cured quickly by arbitrary timing for the adhesion between the base 6 and the base 1.

In the vibration motor of the first embodiment described above, the groove 13a formed on the inner surface of the weight 13 is fitted to the outer periphery of the core 8 to be fixed, but as in the second embodiment shown in Figs. The upper and lower weights 16a and 16b may be adhesively fixed to the upper and lower surfaces of the outer periphery of the core 8 so that the entire weight overlaps with the upper and lower surfaces of the core. In this case, the outer peripheral surface of each weight is the outer peripheral surface of the core 8. The protective member 9 is interposed between the weight and the coil so that the inner circumferential surface of the weight does not come into contact with the coil 10 in conformity with.

In the second embodiment, since the weights 16a and 16b are two-divided types, the weights of the weights are slightly the same as those of the first embodiment, but the maximum rotation radius of the weights is equal to the maximum rotation radius of the core 8. There is an advantage that the vibration motor can be further miniaturized.

In the above-described first and second embodiments, the upper surface of the cylindrical portion 7a of the support 7 is formed in the stator yoke 3 formed in a cylindrical shape, but as in the third embodiment shown in FIG. The stator yoke 17 is formed in a cylindrical shape having a vertical hole 17a for inserting and fixing the fixed shaft 4, and the support 18 is placed on the cylindrical portion 18b above the flange portion 18b. 18a) may be shaped so that it does not protrude, and it may be set as the structure which a cylindrical part does not face in a stator yoke. In addition, in FIG. 5, the code | symbol 18c represents a support protrusion.

In addition, as shown in FIG. 5, the lower end of the fixed shaft 4 may be inserted directly into the recessed part 1c formed in the upper surface of the base 1, and may be fixed, and the base 6 may not be provided.

Although all of the first to third embodiments described above are shaft fixed types in which the axes do not rotate, there are cases in which the rotary shaft type is used as in the fourth embodiment shown in FIGS. 6 and 7.

In the fourth embodiment, the low friction coefficient is synthesized in the same manner as the disk-shaped thruster 20 made of a synthetic resin material having a low friction coefficient in the cylindrical stator yoke 19 in which the upper part is closed but the lower part is opened. A cylindrical bearing sleeve 21 made of a resin material and having an upper and lower opening is provided. An upper half of the rotating shaft 22 is rotatably inserted into the bearing sleeve 21, and an upper end of the rotating shaft 22 is thruster. (20) abuts.

On the inner circumferential surface of the bearing sleeve 21, as shown in FIG. 8, for example, a herringbone-shaped dynamic pressure groove 24 is formed to reduce friction between the rotating shaft and the like.

Moreover, the upper end of the rotating shaft 22 is formed in spherical shape, and the contact area with respect to thrust is made small, and stability at the time of rotation improves.

The support 23 was fixed to the lower half of the rotating shaft 22, which is a cylindrical portion 23a serving as a commutator, a flange portion 23b facing outward from the upper end of the cylindrical portion, and an outer peripheral portion of the flange portion. It consists of several support protrusion 23c which protrudes upwards from the back.

The other configuration of the vibration motor of this embodiment is the same as that of the first embodiment, and the horizontal plane MP passing through the center of the magnet 5 is positioned above the horizontal plane CP passing through the center of the core 8. The rotating member which consists of the core 8, the support body 23, and the rotating shaft 22 is attracted upward by the magnetic attraction force with respect to the core of a magnet.

Therefore, the upper end of the rotating shaft 22 always abuts against the thruster 20, and a gap γ is formed between the lower end of the rotating shaft and the upper surface of the base, and the gap γ is formed between the lower surface and the base of the weight 13. (1) It is almost the same as the clearance gap (beta) between upper surfaces.

Since the vibration motor according to the present invention has a weight installed in the housing, it is not necessary to consider the driving space of the weight at all when the vibration motor is mounted in the equipment to be mounted such as a small telephone, and the freedom of design of the equipment to be mounted is significantly improved. In addition, since the shaft has a short shaft length, there is almost no fear of breakage due to the impact from the outside.

Moreover, since the upper part of the cylindrical part of the support body is faced in the stator yoke in which the lower part is opened, the mounting length of the support member with respect to the fixed shaft is large, and a horizontal plane passing through the center of the weight passes through the upper part of the cylindrical part, and thus from the outside The radial direction component of the force applied to the weight due to the impact is dispersed over almost the entire length of the fixed shaft, so that there is little fear of twisting or breaking of the support, and vibration data with high durability can be realized.

In addition, since the lower end of the fixed shaft is fixed to the base through the base, the lower part of the base is set to a dimension movable in the horizontal direction with respect to the center hole of the base, so that the base and the base are adhesively fixed at the end of the manufacturing process of the vibration motor, At this time, by adjusting the horizontal position of the seat, the mounting angle of the fixed shaft can be set accurately, and even if a mounting error of each member occurs during manufacture, there is no risk of inclination on the fixed shaft due to the mounting error. As a result, the generation of defective products due to the mounting error at the time of manufacturing such that the rotating member is in contact with the housing or the base is virtually eliminated, and the product yield can be improved.

In addition, since the horizontal plane passing through the center of the magnet is positioned above the horizontal plane passing through the center of the core, the core is attracted upward by the magnetic force of the magnet, and thus the support is lifted upward together with the core. There is no fear that the support or the rotating shaft will come into contact with the base when the motor is driven, i.e., without being impacted from the outside, and the durability is large because there is almost no damage or wear of each member when these supports or the rotating body come into contact with the base. Long life vibration motor can be realized.

In addition, since the weight is mounted on the core so that at least a part of the weight overlaps the upper and lower surfaces of the ring-shaped body portion of the core, the rotation radius of the weight can be reduced compared to the case where the weight is mounted on the outer periphery of the core, thereby realizing a small vibration motor. have.

Claims (8)

A cylindrical housing having a top plate but opening at the bottom thereof is fixed on the base, and an upper end portion of the stator yoke having a ring-shaped magnet magnetized in a radial direction to the top plate of the housing is fixed to the base, and the center of the stator yoke is opened. The lower end of the fixed shaft is inserted into one vertical hole and the lower end of the fixed shaft is fixed to the base, and the lower part serves as a commutator, the flange part facing outward from the cylinder part, and protrudes upward from the outer peripheral part of the flange part. In the support body consisting of a plurality of supporting projections, the inner surface has a plurality of extreme values opposed to the outer circumferential surface of the magnet inside the ring-shaped main body portion, the coil is wound around the leg portion of each extreme value, the eccentric weights on the outer peripheral portion The core is mounted by sandwiching the support protrusion of the support between the adjacent cores adjacent to each other. A vibrating motor formed by rotatably installing a support around a fixed shaft such that a commutator at the bottom contacts a brush provided on a base. 2. The vibration motor according to claim 1, wherein the stator yoke is formed in a cylindrical shape with a lower opening, and the upper part of the cylindrical portion of the support faces the stator yoke. 2. The lower end of the fixed shaft is fitted into a central concave portion formed on an upper surface of a circumferential seat having an outer circumferential flange at an upper portion thereof, and the lower seat is opened in a base and is smaller than the outer diameter of the lower seat. Vibration motor, the base is fixed to the base so as to face the inner hole of the large inner diameter. The vibration motor according to claim 1, wherein a large inner diameter portion is formed on the inner surface of the cylindrical portion of the support portion, the inner diameter being slightly larger than the upper and lower portions, and an oil collection portion is provided between the fixed shaft and the cylindrical portion. The vibration motor according to claim 1, wherein a horizontal plane passing through the center of the magnet is located above the horizontal plane passing through the center of the core, and the core is always sucked upward by the magnetic force of the magnet. The upper end of the stator yoke having a base plate but having a cylindrical housing having a bottom opening fixed on the base, a top of which is closed to the top plate of the housing but having a bottom opening, and having a ring-shaped magnet magnetized in a radial direction It is fixed, and a cylindrical bearing sleeve is inserted and fixed in this stator yoke, and the lower part is a cylindrical part which serves as a commutator, the flange part which goes outward from this cylindrical part, and protrudes upwards from the outer periphery part of this flange part. A support body consisting of a plurality of support protrusions is fixed around the rotational axis, and the inner side has a plurality of extreme values opposed to the outer circumferential surface of the magnet inside the ring-shaped body portion, and a coil is wound around the leg portion of each extreme value, and the outer peripheral portion The support protrusion of the support is inserted between the cores with the eccentric weight mounted on the core It mounted on the support, and the vibration motor is a commutator at the bottom of the support formed by rotatably mounted within the bearing sleeve the upper portion of the rotary shaft so as to be in contact with a brush mounted on the base. The vibration motor according to claim 6, wherein a dynamic pressure groove is formed on an inner surface of the bearing sleeve. 7. The vibration motor according to claim 1 or 6, wherein the eccentric weight is mounted on the core such that at least a portion thereof overlaps the upper and lower surfaces of the ring-shaped body portion of the core.