KR100385074B1 - Vibration motor - Google Patents

Abstract

The present invention discloses a vibration motor.

The present invention is a cylindrical case in which a magnet is fixed to an inner circumferential surface, a cylindrical core provided with a space inside the magnet and having a vertical shaft hole, and rotatably supported in the case while being inserted into the shaft hole of the core. It consists of a shaft coupled to the eccentric induction weight, and a sheet coil of a sheet that generates electromagnetic force by interaction with a magnet having an air gap attached to the outer circumferential surface of the core, and has no unnecessary air gap compared to the conventional vibration motor structure. Since this eliminates the leakage magnetic field is minimized to improve the driving characteristics of the motor, and in particular, it is easy to miniaturization and thinning has the effect of promoting the miniaturization and thinning of the equipment used.

Description

Vibration Motor

The present invention relates to a vibration motor, and more particularly, to a vibration motor that can ensure the maximum degree of freedom of design while precisely managing the air gap.

In general, one of the functions required for a portable communication device is the incoming call function, and the most commonly used type for the incoming call function is the vocal sound such as a melody or a bell and the vibration that shakes the device. In other words, if the user selects a function required for the incoming call in advance, the selected function is acted upon so that the user can detect the incoming call.

Among these types of incoming calls, the vibration function is especially used in consideration of preventing many people from harming noise pollution in crowded places. Voice function such as melody or bell among incoming types mainly detects incoming call by transmitting various kinds of melody or bell pre-input to outside through small speaker, and vibration function drives small vibration motor. The vibration force is transmitted to the case of the device so that the device can vibrate.

On the other hand, the vibration function used in the past is operated by a vibration motor mounted separately in the device, the most typical of such a vibration motor is a coin type vibration motor (coin type) vibration motor having a larger diameter than the thickness and the outside, It is classified into a cylindrical vibration motor having a weight attached to the shaft protruding into, and the cylindrical vibration motor is mounted on most mobile communication terminals because it has excellent vibration characteristics compared to the coin type vibration motor.

1 is a cross-sectional view showing a vibration motor according to the prior art, Figure 2 is a cross-sectional view showing a line "AA" of Figure 1, as shown, the vibration motor 100 is formed by a current flowing in the coil 130 The shaft 140 is rotated by the electromagnetic force generated by the interaction between the magnetic field and the magnetic field formed by the magnet 120, and the shaft 140 is attached with a weight (w) for inducing eccentric rotation, thereby causing vibration. Will be generated.

Looking at the structure of the conventional vibration motor 100 is largely divided into a stator composed of a case 110 and a magnet 120, and a rotor composed of a coil 130, a commutator 155 and a shaft 140. .

The case 110 has a cylindrical shape and a coil 130 wound to have a cylindrical shape with a predetermined interval on its inner circumferential surface, and a magnet for generating an electromagnetic force with the coil 130 on the inner circumferential surface of the coil 130. 120 is provided while forming a spaced interval.

On the other hand, the coil 130 is coupled to the commutator 155 is configured such that the lower inner peripheral surface is integrally rotated with the shaft 140, it is provided in the form of a sheet (sheet) pressed in the axial direction in a state of being wound in a conventional polygon. The coil 130 is firmly hardened by a chemical composition to maintain its shape even at high speed.

In addition, the magnet 120 has a top end fixed to the case 110 and the bottom end is connected to a bearing (b) rotatably supporting the shaft 140 to form a stator integrally with the case 110 as shown in the drawing. Done.

On the other hand, the inside of the case 110, the brush 150 is fixed through the base (110a), the brush 150 is configured to receive power from the outside to deliver to the commutator 155. And the shaft 140 is rotatably supported by a plurality of bearings (b) in the center of the case 110, one end thereof is projected to the outside of the case 110 to induce an eccentric weight (w) is coupled do.

In the conventional vibration motor 100 configured as described above, when current flows in the coil 130 by the commutator 155 and the brush 150 sequentially, the magnet 120 is formed to face the coil 130. Rotation force is generated in the coil 130 while electromagnetic force is generated therebetween. The shaft 140 fixed to the hole 130 (not shown) of the coil 130 and the commutator 155 by the rotation force is a bearing (b). It is rotated while being supported. At this time, the shaft 140 is coupled to the weight (w) to induce an eccentricity, so that the shaft 140 rotates to cause vibration, which is used as a silent call means of the mobile communication terminal.

However, the conventional vibration motor 100 as described above has a disadvantage in that the void management and assembly work are very poor due to the structure in which the coil 130, which is a rotating body, is disposed between the magnet 120 and the case 110.

That is, since the coil 130 rotates at high speed when the motor is driven, in order to prevent contact with the case 110 and the magnet 120 and to ensure stable driving characteristics, the coil 130 necessarily closes the gap between the case 110 and the magnet 120. As a result, the air gap management is not precisely made, so there is a problem in that the thickness of the vibration motor 100 is limited in a situation in which a miniaturization of the device is urgently required.

In addition, in the assembling process, the coil 130 needs to be assembled in a state having a predetermined gap between the case 110 and the magnet 120, and thus there is a problem in that the assembly work is very poor and productivity is lowered.

The present invention was created in order to solve such a conventional problem, and an object of the present invention is to form a cylindrical core in the inner circumference of the coil to precisely manage the air gap, while minimizing the product and minimizing the leakage magnetic field of the motor. The purpose is to provide a vibration motor that can improve the performance.

In addition, the present invention has another object to simplify the structure to significantly reduce the manufacturing cost of the device.

1 is a cross-sectional view showing a vibration motor according to the prior art,

FIG. 2 is a cross-sectional view illustrating a line “A-A” of FIG. 1;

3 is a cross-sectional view showing a vibration motor according to the present invention,

4 is an exploded perspective view showing a core in a vibration motor according to the present invention;

FIG. 5 is a cross-sectional view illustrating a line “B-B” of FIG. 3;

Figure 6 is a side view showing a sheet coil attached to the outer peripheral surface of the core in the vibration motor of Figure 3,

7 is a cross-sectional view showing another embodiment of FIG. 5;

Figure 8 is a side view showing a flexible circuit board attached to the outer peripheral surface of the core in the vibration motor of Figure 5;

<Explanation of symbols for main parts of drawing>

10: vibration motor 11: case

12: magnet 14: shaft

15: brush 15a: commutator

20: core 30: electromagnetic force generating means

31: sheet coil 32: flexible substrate

b: bearing w: weight

c: washer

In order to achieve the above object, the vibration motor according to the present invention includes a cylindrical case in which a magnet is fixed on an inner circumferential surface thereof, a cylindrical core having a space in the inner side of the magnet, and having a vertical shaft hole, and a shaft hole of the core. It is rotatably supported on the case while being inserted into the shaft is composed of a thin sheet coil that generates an electromagnetic force by interaction with a magnet coupled to the circumference inducing eccentricity, and attached to the outer peripheral surface of the core and having a void It is characterized by.

The core of the present invention is characterized in that a plurality of ring cores having a predetermined thickness are formed with shaft holes in the center thereof.

The sheet coil of the present invention is characterized by being wound to have a three-phase connection and a phase difference of 120 degrees.

The magnet of the present invention is characterized in that the upper side coincides with the upper side of the core and the lower side extends more than the lower side of the core.

The case of the present invention is characterized in that the washer is attached to the shaft through the upper inner surface.

Another characteristic of the vibration motor according to the present invention is a cylindrical case in which a magnet is fixed to an inner circumferential surface, a cylindrical core having a space inside the magnet and having a vertical shaft hole, and a case being inserted into the shaft hole of the core. It consists of a flexible substrate which is rotatably supported at one end, and has a shaft coupled with an eccentric induction at one end and an electromagnetic force generated by interaction with a magnet having an air gap attached to an outer circumferential surface of the core.

The core of the present invention is characterized in that a plurality of ring cores having a predetermined thickness are formed with shaft holes in the center thereof.

The flexible substrate of the present invention is characterized in that a pattern is printed to have a three-phase connection and a phase difference of 120 degrees.

The magnet of the present invention is characterized in that the upper side coincides with the upper side of the core and the lower side extends more than the lower side of the core.

The case of the present invention is characterized in that the washer is attached to the shaft through the upper inner surface.

Hereinafter, a preferred embodiment of a vibration motor according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view showing a vibration motor according to the present invention, Figure 4 is an exploded perspective view showing a core in the vibration motor according to the present invention, as shown, the vibration motor 10 is largely divided into stators and rotors. The stator includes a case 11, a magnet 12, a brush 15, and the like, and the rotor includes a shaft 14, a commutator 15a, a core 20, and an electromagnetic force generating means 30.

The case 11 forms the outer body of the motor, and various components are embedded therein, and are usually manufactured in a cylindrical shape having a predetermined length. The case 11 is a magnet 12 is fixed to the inner peripheral surface.

Magnet 12 is usually used Nd sintered magnet, and interacts with the electromagnetic force generating means 30 to be described later to generate the electromagnetic force.

On the other hand, the case 11 is provided with a base (11a) fixed to the brush 15 on the lower inner peripheral surface as shown in Figure 3, the brush 15 is supplied with power from the outside commutator (to be described later) 15a).

The shaft 14 is disposed in the center of the case 11 so that the upper and lower ends are rotatably supported by the bearing b, and the upper end extends to the outside of the case 11 when viewed in the drawing. The shaft 14 is coupled to a weight (w) to induce an eccentricity to one end extending to the outside of the case 11 to generate a vibration.

In addition, the shaft 14 has a core 20 and an electromagnetic force generating means 30 are sequentially provided on the outer circumferential surface thereof, and at one side of the lower end thereof, a commutator 15a electrically contacting the brush 15 is applied. Combined.

The core 20 is coupled to the outer circumferential surface of the shaft 14 and is integrally rotated. As shown in FIG. 4, the ring core 21 has a predetermined thickness and has a shaft hole through which the shaft 14 is inserted. It consists of several sheets laminated.

The electromagnetic force generating means 30 is attached to the outer circumferential surface of the core 20 and is provided while forming a gap at a predetermined interval with the aforementioned magnet 12. The electromagnetic force generating means 30 is provided in a sheet coil as shown in FIGS. 5 and 6.

The sheet coil 31 is usually wound to form a hexagonal pillar shape, and then a pair of opposing surfaces are pressed to advance in opposite directions to form a sheet. The coil deformed in the sheet form is After the outer circumferential surface of the core 20 is wrapped again, it is fixed through an epoxy resin material having excellent heat resistance. In order to ensure stable driving characteristics, the sheet coil 31 has been wound to have a phase difference of 120 degrees while connecting in three phases.

On the other hand, the above-described electromagnetic force generating means 30 is not limited to the sheet coil 31 can be used as a flexible substrate 32 of a thin film as shown in Figure 7 and 8 attached. Like the sheet coil 31 described above, the flexible substrate 32 has a three-phase connection structure and a circuit pattern is printed to have a phase difference of 120 degrees, and the core 20 is formed through an adhesive glass tape formed of an epoxy resin material. It is fixed to the outer circumferential surface of the.

In addition, the vibration motor 10 according to the present invention configured as described above is the core 20 to minimize the interference with the peripheral components as the rotor including the core 20 and the shaft 14 is moved in the axial direction during driving. ) And the magnetic center of the magnet 12 are arranged to be offset from each other.

That is, as shown in FIG. 3, the upper side of the magnet 12 and the upper side of the core 20 have the same height, but the lower side of each of the magnets 12 is lower than the core 20. Is made to extend.

Therefore, since the magnetic center of the magnet 12 is located below the magnetic center of the core 20 when viewed from the drawing, the rotor core 20 is consequently applied to the magnetic force of the magnet 12 to be matched to the magnetic center of the magnet 12. Will always be forced to move downward. Therefore, since the rotor maintains a constant friction load during rotation, the driving characteristics are stable.

That is, the vibration motor 10 is a state in which the magnetic center of the magnet 12 and the core 20 do not match, so that the magnet 12 as the stator pulls the core 20 as the rotor. Flotation is reduced when the rotor rotates.

On the other hand, the vibration motor 10 of the present invention is a washer under the upper shaft system of the case 11, as shown in Figure 3 to prevent the rotor rotated at high speed to be in direct contact with the case 11 by the floating force ( c) is provided. That is, the washer (c) is a configuration in which a through hole (not shown) of a predetermined size is formed so that the shaft 14 penetrates to the center thereof, and an upper surface thereof is attached to the upper inner surface of the case 11.

Therefore, the washer (c) is to prevent the rotor rotating at high speed to be in direct contact with the case 11 by the floating force to reduce the wear and breakage of the parts. Such a washer (c) is usually configured to be larger than the outer diameter of the bearing (b) rotatably supporting the shaft (14) is preferably configured to ensure falling reliability of the bearing (b).

Referring to the operation of the vibration motor according to the present invention made as described above are as follows.

When power is applied to the electromagnetic force generating means 30 through the commutator 15a in electrical contact with the brush 15, between the magnet 12 arranged on the outer circumferential surface of the electromagnetic force generating means 30 and having a gap therebetween. The electromagnetic force is generated by the interaction between the magnetic fields. At this time, the rotation force is generated in the electromagnetic force generating means 30 by the electromagnetic force.

Therefore, the rotor composed of the electromagnetic force generating means 30, the core 20 and the shaft 14 to which the electromagnetic force generating means 30 is attached, rotates about the stator.

Here, since the shaft 14 is rotated in an eccentric state by the weight (w) to induce an eccentricity at one end, such an eccentric driving force is transmitted to the outside through the case 11 to vibrate the device. do.

On the other hand, the core 20, which is a rotor in the vibration motor 10, driven as described above has a force to be matched to the magnet 12 is located in the relatively lower magnetic field center to maintain a constant friction load during rotation stable drive Characteristics are guaranteed.

On the other hand, the above-described embodiment is merely described one preferred embodiment of the present invention, the scope of application of the present invention is not limited to such, and can be changed as appropriate within the scope of the same idea. For example, the shape and structure of each component shown in the embodiment of the present invention can be modified.

As described above, according to the vibration motor according to the present invention, since the sheet coil or the flexible substrate is formed to form a cylindrical core and generates electromagnetic force by interaction with the magnet, the pore management can be precisely controlled. have.

Therefore, compared to the structure of the conventional vibration motor, unnecessary voids are eliminated, thereby minimizing the leakage magnetic field to improve the driving characteristics of the motor, and in particular, it is easy to miniaturize and thinner, thereby promoting the miniaturization and thinning of the used equipment. .

In addition, the workability is improved by the structure of attaching the sheet coil or the flexible substrate to the core, thereby greatly reducing productivity and manufacturing costs.

Claims (10)

A cylindrical case having a magnet fixed to an inner circumferential surface thereof; A cylindrical core provided with a space inside the magnet and having a vertical shaft hole; A shaft which is rotatably supported by the case while being inserted into the shaft hole of the core and has one end coupled with a weight for inducing an eccentricity; A thin sheet coil attached to an outer circumferential surface of the core and generating electromagnetic force by interaction with a magnet having voids; Vibration motor, characterized in that consisting of. The vibration motor of claim 1, wherein a plurality of ring cores having a predetermined thickness are formed by forming a shaft hole in the center thereof. The vibration motor of claim 1, wherein the sheet coil is wound in a three-phase connection and has a phase difference of 120 degrees. The vibration motor of claim 1, wherein the magnet has an upper side coinciding with an upper side of the core and a lower side extends more than the lower side of the core. The vibration motor as set forth in claim 1, wherein the case has a washer attached to the upper inner surface thereof through which a shaft passes. A cylindrical case having a magnet fixed to an inner circumferential surface thereof; A cylindrical core provided with a space inside the magnet and having a vertical shaft hole; A shaft which is rotatably supported by the case while being inserted into the shaft hole of the core and has one end coupled with a weight for inducing an eccentricity; A flexible substrate attached to an outer circumferential surface of the core and generating electromagnetic force by interaction with a magnet having voids; Vibration motor, characterized in that consisting of. 7. The vibration motor of claim 6, wherein the core is formed by stacking a plurality of ring cores having axial holes in the center thereof and having a predetermined thickness. 7. The vibration motor of claim 6, wherein the flexible substrate has a three-phase connection and a circuit pattern is printed to have a phase difference of 120 degrees. 7. The vibration motor of claim 6, wherein the magnet has an upper side coinciding with an upper side of the core and a lower side extends more than the lower side of the core. The vibration motor of claim 6, wherein the case has a washer attached to the upper inner surface thereof to allow the shaft to pass therethrough.