KR100220648B1 - Vibration generator for mobile terminal - Google Patents

Abstract

The present invention relates to a vibration generator, in particular, a structure that can increase the effective space for the winding of the rotor while maintaining the height of the motor to minimize the performance of the motor and at the same time easy to respond to high applied voltage vibration It is about a generator.

A housing consisting of a quadrangular shape in which a flat surface and a curved surface of the present invention are alternately disposed, the left / right width of the longitudinal section being larger than the height, a bearing house extending in a cylindrical shape from one end of the housing into the housing, and A pair of sleeve bearings coupled to both ends of the bearing house, an shaft rotatably supported by the pair of bearings, an unbalanced weight for generating vibration by generating centrifugal force in accordance with the rotation of the shaft, and the bearing house And a cylindrical drive coil arranged at a predetermined interval in the axial direction to form a rotor, a rotor support for supporting and integrating the inner end portion of the shaft and the inner end portion of the drive coil at an inner circumferential portion and an outer circumferential portion, and a tip of the rotor support. Three rectifiers fixedly installed at the outer circumference and connected to the driving coil, respectively; A pair of brushes mounted on the other end of the housing for applying a DC applied power applied from the outside to the rectifier segment, and disposed in the left and right curved surface inner circumference of the housing with a predetermined distance from the drive coil Characterized in that consists of a pair of magnets to form a.

Description

Miniature vibration generator for mobile communication

The present invention relates to a vibration generator, in particular, a structure that can increase the effective space for the winding of the rotor while maintaining the height of the motor to minimize the performance of the motor and at the same time easy to respond to high applied voltage vibration It is about a generator.

Vibration generator, which is conventionally used for the transmission of incoming calls in most pagers and mobile phones, is known as "pager motor", which is manufactured in extremely small diameters of about 6 (m / m) and is extremely small. Composed of motor and unbalance weight of artificial center of gravity combined with its rotating shaft, it adopts static unbalance excitation method that uses centrifugal force generated by rotation of motor as a source of vibration. .

The basic configuration of the conventional vibration generator is a permanent magnet (4) inside the cylindrical housing (3) forming the outer shape of the motor 1, as shown in Figure 1 (a) and 1 (b) and 2 ) Is bound, and the center of the rotor (R) in which the core (6) is wound around the drive coil (5) is located. Coupling members (or bearings) 8A and 8B are formed between the housing 3 and both ends of the rotation shaft S of the rotor R to facilitate the rotation of the rotor, respectively. 3) The unbalance weight 2 for centrifugal force generation is attached to one side rotation shaft S of the rotor R which protrudes outward.

The vibration generator having such a structure applies an electric current to the drive coil 5 (via the brush B) through the input line or the terminal 9, and is generated by the electromagnetic force and the permanent magnet 4 by the drive coil 5. Between the magnetic fields, a rotational force in the direction based on Fleming's left hand law is generated in the rotor R inside the motor 1. The rotational force of the rotor R is transmitted to the unbalanced weight 2 for the center of gravity movement assembled by artificial manipulation, and the centrifugal force is generated. As a result, the centrifugal force acts as a vibration for moving the entire motor.

이상으로 크게 이루어지는 단점을 안고 있다. 따라서 무선 호출기와 같이 사이즈가 초소형으로 축소되고 있는 제품에는 채용이 곤란하였다.In the motor 1 having the core 6 in the rotor R as described above, the size of the motor, in particular, the diameter D1 (height) is 6

It has a disadvantage that is made larger than above. Therefore, it is difficult to adopt the product which size is reduced to microminiature like a pager.

A structure for improving the disadvantages of such a cored motor is shown in FIG.

The motor shown in FIG. 3 is a coreless motor, in which a drive coil 12 forming a rotor is disposed in a cylindrical housing 11 with a space therebetween, and is tightly coupled to the rotating shaft 15 at one side not shown. In addition, both ends of the rotation shaft 15 are rotatably supported by the sleeve bearing 14, and an unbalanced weight is coupled to an end portion extending out of the motor. The sleeve bearing 14 is supported inside the cylindrical bearing house 16 integrally formed with the housing 11, and the cylindrical magnet 13 is tightly fixed to the outer circumference of the bearing house 16.

가 넘는 사이즈를 갖게 된다. 따라서 초소형 무선 호출기 등에는 채용이 어려운 문제점이 있다.The coreless cylindrical motor described above reduces the diameter (height) (D2) of the motor by removing the rotor core when used as a vibration generator, but still has a diameter (D2) of 5

Will have a size over. Therefore, there is a problem in that it is difficult to employ a micro pager.

Accordingly, a coreless motor as shown in FIG. 4 has been proposed as a structure for reducing the height of the cylindrical phaser motor.

The structure of the motor except for the shape of the housing 21, the drive coil 22, the magnet 23, the sleeve bearing 24, the rotating shaft 25, and the bearing house 26 in the housing is a motor of FIG. Is the same as

Here, the housing 21 has flat portions 21A and 21B parallel to the upper and lower portions in order to facilitate mounting on the apparatus main body and to lower the height D3 of the motor, and curved portions 21C and 21D on the left and right sides. Has

이하로 제작하는 경우는 각종 부품의 소형화에 따른 제조공정의 난이도가 증가하고, 불량률이 높아지며, 모터의 성능이 떨어지는 문제점이 발생된다.However, in the motor structure in which the upper and lower heights D3 and the left and right widths are different from each other, only the outermost housing is changed in shape, and the internal structure has the same structure as the conventional example of FIG. Therefore, it is difficult to lower the height (D3) of the motor as compared with the prior art, and by lowering it excessively, for example, 5

In the case of manufacturing below, the difficulty of the manufacturing process according to the miniaturization of various components increases, the defective rate increases, and the performance of the motor is deteriorated.

On the other hand, the applied voltage supplied to the vibration DC motor of the above-mentioned pager is currently used, whereas the applied voltage of the mobile telephone is higher than that of 3 (V) or 6 (V).

Therefore, in a structure in which the excessive motor height is lowered, it is difficult to cope with high voltage and there may be a problem in performance.

In addition, a method of increasing the number of windings of the driving coil may be considered to increase the vibration force. However, in the conventional motor structure, since the effective space required to increase the number of windings of the coil is small, the performance of the motor is limited. have.

Therefore, the present invention has been made in view of the problems of the prior art, the purpose of which is to maintain the height of the motor while maintaining the minimum height of the motor by a coreless motor structure of the outer magnet type that can increase the effective space for the winding of the rotor The present invention provides an ultra-small vibration generator for mobile communication that improves the performance and easily copes with high applied voltage.

1 is a front view of a conventional vibration generator, in which FIG. 1 (a) is a front view and FIG. 1 (b) is a left side view.

2 is a longitudinal cross-sectional view of one example of the vibration generator shown in FIG.

3 is a longitudinal sectional view of another example of the vibration generator shown in FIG.

4 is a longitudinal sectional view of another vibration generator similar to the example of FIG.

5 is a longitudinal sectional view of a vibration generator according to the invention.

6 is a sectional view taken along line VI-VI in FIG.

7 is a longitudinal cross-sectional view of the rotor assembly in FIG.

8 is a plan view of the brush assembly in FIG.

* Explanation of symbols for main parts of the drawings

31 housing 31A, 31B: flat surface

31C, 31D: Curved surface 32: Drive coil

33A, 33B: Magnet 34A, 34B: Sleeve Bearing

35: axis 36: bearing house

37 ringlet 38 rotor support

38: through groove 39A-39C: rectifier segment

40A, 40B: Brush 41: Brush Body

42A, 42B: External terminal 43: Unbalanced weight

In order to achieve the above object, the present invention is a four-cylindrical shape in which a flat surface and a curved surface are alternately arranged, the housing made of a left / right width of the longitudinal section larger than the height between the flat surface, and at one end of the housing. A bearing house formed in a cylindrical shape extending into the housing, a pair of sleeve bearings coupled to both ends of the mall bearing house, a shaft rotatably supported by the pair of bearings, and an outer end extending outside the housing. And an unbalanced weight for generating vibration by generating centrifugal force according to the rotation of the shaft, a cylindrical drive coil disposed at a predetermined interval in the axial direction with the bearing house to form a rotor, and an inner end of the shaft and the drive coil. A rotor support for supporting and integrating an inner end portion from an inner circumferential portion and an outer circumferential portion, and the rotor Three rectifier segments fixedly installed at equal intervals on the outer periphery of the support and connected to the drive coils, and a pair of brushes mounted on the other end of the housing to apply DC applied power applied from the outside to the rectifier segments. And a pair of magnets arranged at an inner circumference of the left and right curved surfaces of the housing with a predetermined distance from the driving coil to form a stator.

The left / right width of the housing is made longer by at least two lengths of the magnet thickness than the height, each magnet is characterized in that it is made of a quarter-cylindrical shape.

In addition, the sleeve bearing is made of an iron-based oilless metal, as a result it can omit the yoke for the magnet as conventional.

Furthermore, the present invention further includes a ringlet having a circumferential through-groove for pressing the inner end of the shaft and preventing the axial flow of the rotor support and increasing the coupling force between the rotor support and the shaft.

As described above, in the present invention, the height of the longitudinal section of the housing is set to the minimum height, and the left / right width of the longitudinal section is formed longer than the height, and a pair of magnets for the stator are separated from the left / right and fixed to the housing. have.

Therefore, if the height of the housing is the same as before, the effective space in which the rotor drive coil can be disposed can be secured relatively larger than that of the conventional inner magnet structure motor, and the performance of the motor is improved by increasing the number of windings. And, the design corresponding to the high voltage application can be easily made and the production failure can be reduced. In addition, when the driving coil is the same as in the related art, in the present invention, the height of the housing, that is, the mounting height of the motor can be reduced by the length corresponding to the magnet thickness twice that of the conventional inner magnet structure. To realize.

EXAMPLE

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

5 is a longitudinal sectional view of the micro vibration generator according to the present invention, FIG. 6 is a sectional view taken along line VI-VI in FIG. 5, FIG. 7 is a longitudinal sectional view of the rotor assembly in FIG. FIG. 5 is a plan view of the brush assembly in FIG.

First, referring to FIG. 5, the housing 31 has a flat surface 31A and 31B formed on the upper and lower sides, and curved surfaces 31C and 31D formed on the left and right sides, as shown in FIG. 6. Has In this case, for example, when mounted on a radio pager, the flat surface 31A or 31B of the housing is disposed below. In addition, the height D4 of the housing 31 is set to have the smallest possible height, and the distance between the left and right curved surfaces 31C and 31D, that is, the width W is at least twice as large as the height D4. It is formed longer by the thickness of the magnet.

In addition, the housing 31 has one end bent inwardly and extends in a cylindrical shape, and the cylindrical portion constitutes a bearing house 36 supporting a pair of inner and outer sleeve bearings 34A and 34B at both ends.

The pair of sleeve bearings 34A and 34B are made of iron-based oilless metal and rotatably support the shaft 35 of the motor inserted therein. In addition, at the inner end of the shaft 35, that is, the end extending outward of the inner sleeve bearing 34A, the ringlet 37 is press-fitted to the outer circumference to make contact with the inner sleeve bearing 33A.

The ringlet 37 has a through hole 37A formed therein to form a structure capable of improving the bonding force with the rotor support 38 formed of a resin.

Meanwhile, as shown in FIG. 7, one end of the cylindrical drive coil 32 forming the rotor in the rotor assembly is fixed to the rotor support 38 by using an adhesive, and an insert molding method is provided at the front end of the support 38. The three rectifier segments 39A-39C are fixed and soldered. In this case, the three rectifier segments 39A-39C are positioned to have a 180 ° spacing from each other. The rotor assembly is thus integrally supported on the shaft 35 and rotatably supported on the sleeve bearings 34A, 34B.

In addition, the brush assembly has a pair of brushes 40A and 40B connected to a pair of external terminals 42A and 42B, respectively, inside the brush body 41 coupled to one end of the housing 31 as shown in FIG. It is fixedly installed, and both ends of the brushes 40A and 40B alternately elastically contact with the three rectifier segments 39A-39C as the rotor rotates to apply external power to the drive coil 32 of the motor. .

Referring back to FIG. 5, the outer end of the shaft 35 extends outward of the outer sleeve bearing 34B and the unbalance weight 43 is fixedly installed.

In addition, in the present invention, the pair of magnets 33A and 33B forming the stator of the motor have a rotor in the inner circumference of the left and right curved surfaces 31C and 31D of the housing 31, as shown in FIG. The cylindrical drive coil 32 to be formed is provided at a predetermined interval. Each of the magnets 33A and 33B has a quarter portion in the concentric cylinder with the shaft 35.

The operation of the vibration generator of the present invention configured as described above will be described in detail below.

When current is applied to the drive coil 32 from the external terminals 42A and 42B through the brushes 40A and 40B and the rectifier segments 39A to 39C, the electromagnetic force and the magnets 33A and 33B by the drive coil 32 are applied. The rotational force is generated in the rotor made of the drive coil 32 according to the Fleming's left hand law between the magnetic field.

The rotational force of the rotor is transmitted to the unbalanced weight 43 mounted on the shaft 35 so that the centrifugal force generated as the unbalanced weight 43 rotates vibrates the set equipped with the motor, that is, the mobile communication device.

In this case, in the vibration generator according to the present invention, the magnet 33A, 33B forming the stator is an outer magnet type disposed outside the cylindrical drive coil 32 forming the rotor, and the magnets 33A, 33B are divided into housings. Since the mount D is mounted on the left and right curved surfaces 31C and 31D of the 31, the height D4 of the housing 31 can be determined according to the diameter of the drive coil 32 regardless of the magnets 33A and 33B.

Therefore, if the height (D4) of the housing 31 is set to the same as the housing of the conventional motor, the space between the inner surface of the housing and the cylindrical magnet forms a drive coil space, but in the present invention, Since the wider space between the inner side and the outer side of the bearing house 36 constitutes the drive coil space, it is possible to increase the winding amount of the drive coil 32 relatively, and as a result, to increase the vibration force of the motor. Will be. On the other side, even if it is adopted by a mobile phone and driven at a high voltage, it can have a design margin for it.

Contrary to the above, when the driving coil of the present invention has the same thickness as the conventional driving coil space, the height D4 of the housing 31 can be lowered by twice the thickness of the magnet of the conventional motor housing.

On the other hand, in the present invention, it is possible to omit the yoke for the magnet used in the conventional motor by using the material of the shaft support bearing of the motor as iron.

, 길이(L)-20

로 설정한 경우에 모터의 특성을 측정하여 하기 표 1에 도시하였다.In the following, the motor of the present invention and a conventional motor of the inner magnet type are each outer diameter (that is, height) (H) = 4

, Length (L) -20

When it is set to the characteristics of the motor is shown in Table 1 below.

As can be seen in Table 1, the motor of the present invention has a smaller current consumption than that of the conventional motor, resulting in longer battery life. In general, a motor with a large starting torque can be safely operated even when the applied voltage decreases, thereby ensuring a long service life.

Furthermore, in the structure of the present invention, it is possible to design the diameter of the shaft to have a relatively larger diameter compared to the conventional motor, and as a result, it is possible to improve the mechanical strength of the vibration generator to increase the reliability. In addition, by adopting an amorphous cover on the outer periphery of the motor, the EMI effect can be enhanced.

As described above, in the present invention, the height of the longitudinal section of the housing is set to the minimum height, and the left / right width of the longitudinal section is formed longer than the height, and a pair of magnets for the stator are separated from the left / right and fixed to the housing. have.

Therefore, the effective space in which the rotor driving coil can be disposed can be secured relatively larger than that of the conventional inner magnet structure motor, and the design of the motor can be easily improved and the design corresponding to the application of high voltage can be easily achieved by increasing the number of windings. Can reduce production defects. In addition, in the motor of the present invention, the height of the motor can be reduced by the length corresponding to twice the magnet thickness of the conventional inner magnet structure motor, thereby realizing a very small motor.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments and is not limited to the spirit of the present invention. Various changes and modifications can be made by those who have

Claims (5)

A four-cylindrical shape in which a flat surface and a curved surface are alternately arranged, a housing having a left / right width of the longitudinal section greater than a height between the flat surfaces, a bearing house extending cylindrically from one end of the housing into the housing; A pair of sleeve bearings coupled to both ends of the bearing house, an axis rotatably supported by the pair of bearings, and an outer end extending outwardly of the housing and generating centrifugal force as the shaft rotates. An unbalanced weight for generating vibration, a cylindrical drive coil disposed at a predetermined interval in the axial direction with the bearing house to form a rotor, and an inner end portion of the shaft and an inner end portion of the drive coil on an inner circumference and an outer circumference thereof. The rotor support for integration and the outer peripheral portion of the tip of the rotor support at equal intervals Three rectifier segments fixedly installed and connected to the drive coils, a pair of brushes mounted on the other end of the housing to apply DC applied power applied from the outside to the rectifier segments, and left / right sides of the housing. Miniature vibration generator for mobile communication, characterized in that composed of a pair of magnets disposed at a predetermined interval with the drive coil in the inner peripheral surface to form a stator. The ultra-small vibration generator for mobile communication according to claim 1, wherein each magnet has a quarter cylindrical shape. The miniature vibration generator according to claim 1, wherein the left / right width of the housing is at least twice as long as the magnet thickness than the height. The ultra-small vibration generator for mobile communication according to claim 1, wherein the sleeve bearing is made of iron-based oilless metal. The method of claim 1, further comprising a ringlet having a circumferential through groove for pressing the inner end of the shaft to inhibit the axial flow of the rotor support and to increase the coupling force between the rotor support and the shaft. Miniature vibration generator for mobile communication, characterized in that.

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