JP3310248B2 - Square vibration motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration motor, and more particularly, to a cellular phone or a cellular phone.
PCS Phone) or pager (registered trademark) (Radio Pag)
The present invention relates to a small rectangular vibration motor that is mounted on a mobile communication terminal such as an er (radio caller) and generates a vibration used to notify that a radio signal has been received.

[0002]

2. Description of the Related Art Generally, a motor converts electric energy into mechanical energy, and is usually called an electric motor. Such an electric motor mediates an electromagnetic field in an air gap between a stator and a rotor by a so-called Fleming's left-hand rule that a conductor through which a current passes is subjected to a force in a magnetic field. It is converted into mechanical energy called torque. There are DC synchronous motors and AC commutator motors as electric motors, in which a rotating coil is placed between the N and S poles of an electromagnet and energized and rotated. The principle is based on the "Arago's disc" principle. There are an AC induction motor and a synchronous motor as types using eddy current.

[0003] Such electric motors are not only applied in various fields depending on their types or sizes, but also have a considerably wide range of application. That is, the purpose differs depending on the device installed on the shaft of the electric motor. Such electric motors are used in various electric and electronic machines, for example, a motor for vibration of a pager or a mobile phone, a motor for blowing an electric fan, a motor for hydraulic or pneumatic, or an acupressure machine or a grinder. It is used in quite a lot of fields, such as motors mounted on vehicles.

[0004] In particular, vibration motors used for general cellular phones or pagers can be broadly classified into cylinder type, bar type and coin type.

FIGS. 1 (a) and 1 (b) show a conventional cylinder type vibration motor, in which a bearing 4, a permanent magnet 5 and a moving coil 6 are built in a vibration motor 1. Unlike a general electric motor, only the coil 6 is wound without steel teeth (Steel teeth) inside. Permanent magnet 5 and outer back iron (Backir
on) 7, the coil 6 exists in the gap. When classified according to the position of the air gap, it is a radial air gap (Radial Airgap), and the eccentric mass exists outside the vibration motor 1, and the eccentric weight 2 is formed on the axis of the movable coil 6.

As the permanent magnet 5, a two-pole rare earth permanent magnet magnetized in the radial direction in the form of a cylinder is used. The commutation is performed using a mechanical brush (contact angle: 180 °) and commutator (3-
Segment), driven by a three-phase current input, and rectified to a 60 ° angle.

FIGS. 2 (a) and 2 (b) show a conventional coin-type vibration motor, which has no metal teeth inside like the cylinder-type vibration motor 1. FIG. However, unlike the cylinder type, the air gap is formed in the vertical direction (axial direction), and a large number of coils 10 are built in the eccentric rotor 8. This rotor 8 also has the function of the eccentric mass. Axial gap (Axia
l Airgap) form.

The shape of the permanent magnet 9 is an annular shape, the magnetization direction is the axial direction, and a 4-pole or 8-pole rare-earth permanent magnet is used. Rectification is a mechanical brush (contact angle; 90 °)
And a commutator (6-segment), driven by a three-phase current input, and rectified to an angle of 30 °.

[0009]

However, conventional cylinder type vibration motors and coin type motors are
When incorporated in a terminal device, a new and expensive vibration motor was required due to restrictions. That is, since the eccentric weight is provided outside the cylinder type vibration motor, it is mounted at a specific position where there is no interference with other parts in the device, and thus there is a disadvantage that it is not easy to secure a space.

Also, in the case of a coin-type vibration motor, since it must be always mounted horizontally in a round shape like a coin, it cannot be used in a narrow space or a corner space. It is not easy to secure the space.

Further, the conventional vibration motor is not suitable for a device to be miniaturized due to its large size and weight, and the vibration force is so small that the user cannot feel it easily. There were also problems.

Since the cylinder type vibration motor uses a two-pole permanent magnet whose air gap is magnetized in a radial form,
Since the magnetic flux density of the permanent magnet is low and the torque of the motor is small, there is a problem that the rotational force is small. The coin type vibration motor uses 4 poles or 8 poles as the permanent magnet. There was an insufficient problem to increase the torque in the directional gap.

[0013] As described above, the cylinder type and coin type vibration motors have a problem that the unit price is higher than the shape, size or torque thereof, and that the space for the built-in device is not sufficiently secured.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has been made to reduce the size of a vibration motor by using a permanent magnet having a four-pole outer-circle inner circle magnetized in a radial direction. It is an object of the present invention to provide a square vibration motor capable of generating a sufficient torque and easily securing a space for a built-in device.

According to the present invention, the rotor of the vibration motor also serves as an eccentric weight, and a plurality of coils are wound and fixed at a predetermined angle, thereby simplifying the structure and easily bonding the segment PCB in contact with the brush. Another goal is to reduce design defects and reduce manufacturing costs by designing to gain.

[0016]

According to a first aspect of the present invention, in order to achieve the above object, a hole having a predetermined size is formed in the center of an upper portion, a metal bearing is inserted into the hole, and one side is provided on one side. A rectangular upper case in which a concave groove is formed, and a permanent magnet made up of a plurality of magnets that are attached to the four inner corners of the rectangular upper case, the outer side is a right angle, and the inner side is a circle, A plurality of seating portions are formed at an upper portion, and coils are wound around a plurality of winding protrusions formed on a side surface, respectively, and a rotor holder that rotates inside the permanent magnet, and between the metal bearing and the eccentric weight. An interposed washer, an eccentric weight having an eccentric mass, which is mounted on one side of the rotor holder, and a protruding piece formed at the center, is mounted on the other side of the rotor holder, and is mounted on the other side of the rotor holder. one A common terminal but which is grounded is connected to the protruding piece includes a plurality of segments, selectively the contact piece is formed at one end of the segment, and the segment PCB mounted to the lower end of the rotor holder, the upper end portion,
One end is connected to a conductor to which a current signal is applied from the outside, and the other end is connected to the flexible PCB to which a plurality of elastic brushes are connected so as to be in contact with the segment PCB. A lower part of a square having a predetermined size formed in the center, a metal bearing inserted in the hole, and a concave groove formed on one side surface; A metal bearing, a washer, an eccentric weight, a rotor holder, and a shaft penetrating the flexible PCB fixed to the case and the lower case, respectively.

According to a second aspect, in the first aspect, the permanent magnet is a quadrupole magnet composed of four magnets, and a spacer is mounted between the upper case and the permanent magnet. And

According to a third aspect, in the first aspect, a gap formed between the permanent magnet and the rotor holder around which the plurality of coils are wound is of a radial type in a radial direction.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a perspective view showing a rectangular vibration motor according to the present invention, and FIG. 4 is an exploded perspective view.

The external appearance of the rectangular vibration motor of the present invention is a rectangular parallelepiped from the upper case 11 and the lower case 13 made of a metal material.

The upper case 11 has a hole 38 of a predetermined size formed on one side of the upper center, the metal bearing 12 is inserted into the hole 38, and a concave groove 35 is formed on one side. A spacer 21 is fixed inside the upper case 11, and a plurality of inner magnets having an inner circle with outer angles are magnetized on the inner wall.

As shown in FIG. 5, a plurality of permanent magnets 20a are mounted at the four corners of the rectangular upper case 11, and are rectangular at the outside and circular at the inside.
~ 20d. The permanent magnet 20 preferably has four magnets 20a to 20d attached to four corners.
The magnetization direction of the permanent magnet 20 is magnetized in the radial direction with reference to the inner arc.

Referring to the exploded perspective view of FIG. 4 and the cross-sectional view of FIG. 6, the spacer 21 is interposed between the inner surface of the upper case 11 and the permanent magnet 20 so that the permanent magnet 20 is This is for maintaining a predetermined distance from the side.

Next, a rotor holder 24 made of a synthetic resin material is inserted into the upper case 11, and the rotor holder 24 has an eccentric weight 16, a plurality of coils 26a to 26c,
The common terminal 18 and the segment PCB 22 are integrally formed.

That is, the eccentric weight 16 is formed in a semicircular shape, and the seating portion 29 formed on the rotor holder 24 is formed.
And has an eccentric mass. And
The eccentric weight 16 is preferably made of a material having a large mass such as tungsten. A plurality of winding projections 2 are provided on the rotor holder 24 where the eccentric weight 16 is mounted.
5a to 25c are formed, and coils 26a to 26c are wound around the winding protrusions 25a to 25c respectively by a predetermined number of times. Winding projection 25 around which each coil 26a to 26c is wound
Preferably, three of a to 25c are formed at intervals of 60 °.

A semicircular common terminal 18 is mounted on the other seating portion of the rotor holder 24. The common terminal 18 is for connecting and fixing one end of each of the coils 26a to 26c wound around the winding protrusions 25a to 25c to be grounded. A projecting piece 19 is formed on one side of the common terminal 18 so that one ends of the coils 26a to 26c are connected by soldering.

FIG. 7 shows a bottom view of the rotor holder 24.
As shown in FIG. 7, the segment PCB 22 is adhered, and the segment PCB 22 is divided into a plurality of segments. That is, each of the segments 23a to 23f is made of a conductive material, and is preferably composed of six segments. Contact pieces 27a to 27c are selectively provided at one ends of the segments 23a to 23f.
Are connected to the other ends of the coils 26a to 26c to conduct current. The contact pieces 27a to 27c are the segments 23a
It is preferable to form every other 〜23f.

A washer 15 is interposed between the metal bearing 12 and the eccentric weight 16.
5 is attached to the seating portion 17 of the eccentric weight 16. The washer 15 is for minimizing the mechanical friction between the rotating rotor holder 24 and the metal bearing 12 fixed to the upper case 11.

On the other hand, a flexible PCB 34 is provided at the lower end of the rotor holder 24, and a flexible PCB 3 is provided.
4 is fixed to the lower case 13.

The flexible PCB 34 is a flat cable, to which a pair of electric wires are connected and to which a DC power is applied. At the upper end of the flexible PCB 34, a pair of elastic brushes 32, 33 are provided.
One end of each wire (pattern) of flexible PCB34
And the other end is connected to the segment PCB2.
2 is contacted. That is, the brushes 32 and 33 have a function of supporting the rotor holder 24 with one end connected to the flexible PCB 34 and the other end protruding at a predetermined angle.

In the step of connecting the pair of brushes 32, 33 to the pair of wire ends of the flexible PCB 34, a predetermined hole is formed at each end of the flexible PCB 34, and an integrally formed brush is placed in the hole. After soldering to each hole portion where the electric wire is formed, a portion where the brush is connected is subjected to a cutting process to form a pair of brushes 3.
By manufacturing the brushes 2 and 33, the work process is simplified, and the positions of the symmetric brushes 32 and 33 are fixed.

The lower case 13 has a seating portion 37 on the inside where the flexible PCB 34 is seated, and a hole 39 of a predetermined size formed on one side of the center, and a metal bearing 14 in the hole 39. It is inserted and has a groove 3 on one side.
6 are formed.

The concave groove 36 of the rectangular lower case 13 has the same size as the concave groove 35 of the upper case 11, and when the upper case 11 and the lower case 13 are connected, the electric wire of the flexible PCB 34 is outside. This is to provide a space to be connected.

The connection between the upper case 11 and the lower case 13 is preferably performed by caulking (pressing or pressing to form a groove).

The metal bearings 12, 1 fixed to the upper case 11 and the lower case 13, respectively.
4, washer 15, eccentric weight 16, rotor holder 2
4 and a shaft 30 penetrating the flexible PCB 34
The shaft 30 is fixed to the eccentric weight 16 so that the rotor holder 24 can rotate.

In the present invention having such a configuration, the power supplied from the flexible PCB 34 is a pair of brushes 3.
2 and 33 are applied to the corresponding segments 23a to 23f of the segment PCB 22 which comes into contact with the brushes 32 and 33, and the segments 23a to 23f
By passing a current through 6a-26c, the magnet rotates in a predetermined direction and at a predetermined speed depending on the magnetization direction of the adjacent permanent magnet 20.

At this time, the rotor holder 24 to be rotated is caused to vibrate by the eccentric weight 16 installed therein.
This vibration is transmitted as a driving force for vibrating the cases 11 and 12 about the shaft 30.

As described above, in the present invention, the square permanent magnet ironless DC vibration motor 100 having an inner circle with an outer angle
This is a method in which the rotor having unbalance is driven by an unbalance force generated while rotating, and adopts a method invisible to the coin-type vibration motor 2. Further, the appearance is a rectangular parallelepiped, and has a structure having a radial gap as in the case of the cylinder-type vibration motor 1. When classified according to the position of the gap, the form is a radial gap.

However, while the cylinder type vibration motor 1 has an eccentric rotator on the outside, in the rectangular vibration motor 100 of the present invention, the rotator having the coils 26a to 26c mounted therein serves as an eccentric rotator. The rotor also serves as eccentricity. Therefore, the coin type vibration motor 2
However, the operation method is different in that the coin-type vibration motor 2 uses a gap in the axial direction and the square vibration motor 100 uses a gap in the radial direction.

Further, since the shape of the permanent magnet is in the form of an inner circle with an outer angle, the cylinder-type permanent magnet of the cylinder-type vibration motor 1 and the annular-type permanent magnet of the coin-type vibration motor are different from each other in shape and function. There are big differences. The cylinder type and coin type vibration motors 1 and 2 are both three-dimensional,
The square vibration motor 100 has four magnets 20a-2
The permanent magnet 20 is magnetized in the radial direction with reference to the inner arc of the permanent magnet 20, and the motor uses four-pole magnets 20a to 20d as a whole.

The commutation is performed by mechanical brushes 32, 33 (contact angle;
90 °) and a commutator (six segments), driven by three-phase current input, and rectified to an angle of 60 °.

As described above, the size (preferably, 10 × 10 × 4 mm) of the square vibration motor 100 has a smaller maximum space than that of the conventional vibration motors 1 and 2, and the rectangular vibration motor 100 is mounted upright on the inner wall surface of the device. Since it can be attached to a corner or the like, it is easy to secure a space. Further, since the flexible PCB 34 (or the lead wire) is built in and can be connected, there is no need to attach another lead wire or the like. Further, it has a feature that the coils 26a to 26c mounted on the rotor holder 24 can be easily wound.

On the other hand, the reason for making the vibration motor of the present invention rectangular is that in the form having a gap in the deformation direction, the size of the permanent magnet 20 is inevitably reduced as the size is reduced. Is proportional to the magnetic flux density in the air gap and proportional to the motor torque and speed.
When the corners of the rectangular cases 11 and 12 are used, the permanent magnet 2
The shape of 0 becomes an inner circle with an outer angle, the central portion of the permanent magnet 20 becomes thicker, and the magnetic flux density increases. Therefore, in order to reduce the size of the vibration motor and increase the torque, the vibration motor is designed in a rectangular shape.

The permanent magnet uses a rare earth magnet and uses an anisotropic magnet sintered of Nd (Neodymium), so that the manufacturing cost can be reduced. The initial driving force for the electric power is made sensitive.

Further, by changing the connection method of the coils, not only three phases (three coils) but also two phases (two coils) and a single phase (one coil) can be transformed. In each case, it is possible only by changing the number of coils, the coil arrangement angle, the segment PCB and the brush.

In the present invention, not only a coreless type but also a form having teeth using iron can be deformed, and the shaft is protruded to the outside to be used for driving other than a vibration motor. be able to.

Therefore, it can be easily understood by those skilled in the art that the rectangular vibration motor pursued in the present invention can be deformed, and other embodiments are possible within the scope of the present invention. As such, the scope of the invention is not limited.

[0049]

As described above, the rectangular vibration motor of the present invention is mounted in a mobile phone or a pager,
It is used as a means for notifying of signal reception.A permanent magnet having an inner circle with an outer angle is provided in a rectangular parallelepiped case, and a coil is wound at a predetermined angle around the rotor holder on which the eccentric weight, the common terminal and the segment PCB are mounted. ,
A built-in flexible PCB with a brush is installed, so that vibration can be generated by the torque increased by imbalanced driving of the rotor due to the magnetic flux density of the square permanent magnet. In this case, it is easy to secure the space required for the operation, the initial driving force is excellent, the manufacturing process is simple, and the manufacturing cost is reduced.

[Brief description of the drawings]

FIG. 1 is a view showing a conventional cylinder type vibration motor;
(A) shows a perspective view and (b) shows a cross-sectional view.

FIG. 2 is a diagram showing a conventional coin-type vibration motor;
(A) shows a perspective view and (b) shows a cross-sectional view.

FIG. 3 is a perspective view showing a rectangular vibration motor according to the present invention.

FIG. 4 is an exploded perspective view of a rectangular vibration motor according to the present invention.

FIG. 5 is an exploded perspective view of an upper case of the vibration motor according to the present invention.

FIG. 6 is a sectional view of a rectangular vibration motor according to the present invention.

FIG. 7 is a rear view of the rotor holder.

[Explanation of symbols]

 1, 3, 100 Vibration motor 2, 16 Eccentric weight 11 Upper case 12, 14 Metal bearing 13 Lower case 15 Washer 17 Washer seat 18 Common terminal 19 Projection piece 20 Permanent magnet 20a to 20d Magnet 21 Spacer 22 Segment PCB 23a to 23f segment 24 rotor holder 25a-25c winding projection 26a-26c coil 27a-27c contact piece 28 common terminal mounting part 29 eccentric weight mounting part 30 shaft 32, 33 brush 34 flexible PCB 35, 36 concave groove 37, flexible PCB safety 38, 39 holes

Continuing on the front page (72) Inventor Jang Sang-Moon Dong-Rang Bok Chong-Dong Hyundai APT 101-1002 (56) References JP-A 8-331812 (JP, A) 323 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B06B 1/04 B06B 1/16 H02K 7/065 H02K 23/40

Claims (3)

(57) [Claims] A hole (38) having a predetermined size is formed in the center of an upper portion, and a metal bearing (1) is formed in the hole (38).
2), a rectangular upper case (11) in which a concave groove (35) is formed on one side, and four inner corners of the rectangular upper case (11). A permanent magnet (20) formed of a plurality of magnets having a right angle and a circular inside, and a plurality of seating portions (28, 29) formed on an upper portion, and a plurality of winding protrusions (25a to 25a) formed on side surfaces. 25c) are wound with coils (26a to 26c) respectively, the rotor holder (24) rotating inside the permanent magnet (20), the metal bearing (12) and the eccentric weight (16).
A washer (15) interposed between the eccentric weight, an eccentric weight (16) mounted on one side mounting portion (29) of the rotor holder (24) and having an eccentric mass, and a protruding piece (19) at the center. Formed and the rotor holder (2
4) a common terminal (18) attached to the other-side seating portion (28), one end of each of the coils (26a to 26c) is connected to the protruding piece (19) and grounded; To 23f), and one end of each of the segments (23a to 23f) is selectively provided with a contact piece (27a).
27c), a segment PCB (22) mounted at the lower end of the rotor holder (24), and one end connected to a conductor to which a current signal is applied from the outside at the upper end, and the other end connected to the segment. PCB (2
A plurality of elastic brushes (3
Flexible PCB (34) to which 2, 33) are connected
A seating portion (37) is formed inside the flexible PCB (34), and a hole (3) of a predetermined size is formed in the center.
9) is formed, a metal bearing (14) is inserted into the hole (39), and a concave groove (36) is formed on one side surface. 11) and a metal bearing (12, 14), a washer (15), an eccentric weight (16), a rotor holder (24) and a shaft (30) penetrating the flexible PCB (34) fixed to the lower case (13), respectively. A rectangular vibration motor characterized by comprising: 2. The permanent magnet (20) is a quadrupole magnet composed of four magnets (20a to 20d),
The rectangular vibration motor according to claim 1, wherein a spacer (21) is mounted between the upper case (11) and the permanent magnet (20). 3. A rotor holder (24) around which said permanent magnet (20) and a plurality of coils (26a to 26c) are wound.
2. The rectangular vibration motor according to claim 1, wherein a gap formed between the first and second motors is of a radial type in a radial direction.