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Title:
DISK TYPE TWO PHASE VIBRATION MOTOR
Document Type and Number:
WIPO Patent Application WO/2002/015369
Kind Code:
A1
Abstract:
The present invention relates to a disk type vibration motor of a cellular phone, and in particular to a disk type vibration motor which adapts two phase direct current motor. The disk type two phase vibration motor according to the present invention includes circular upper and lower covers, a stator fixed to the lower cover and formed of two permanent magnets which divide a circular ring into two parts, the brushes fixed to the lower cover in the inner side of the circular ring of the stator and having the angle of 180° between them, a circular type commutator, and a circular plate shape rotor formed of three rotor coils and a rotary shaft. The rotor is fixed to the upper and lower covers by the center rotary shaft, and the rotor is rotated by asymmetrically arranged three rotor coils for thereby generating vibrations.

Inventors:
Jae, Hwan-young (Daeryung Town II, #569-21, Kasan-dong Kumcheon-ku Seoul 153-023, KR)
Application Number:
PCT/KR2001/001384
Publication Date:
February 21, 2002
Filing Date:
August 14, 2001
Export Citation:
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Assignee:
EMBEST CO., LTD (Daeryung Town II, #569-21, Kasan-dong Kumcheon-ku Seoul 153-023, KR)
Jae, Hwan-young (Daeryung Town II, #569-21, Kasan-dong Kumcheon-ku Seoul 153-023, KR)
International Classes:
H02K35/04; H02K7/06; (IPC1-7): H02K35/04; H02K33/18; H02K7/065
Foreign References:
JPH11191950A1999-07-13
JPS63290140A1988-11-28
Attorney, Agent or Firm:
Suh, Jang-chan (Choi, Kim & Partners Yuwha Building 49-2, Banpo-dong Seocho-ku Seoul 137-040, KR)
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Claims:
What is claimed is:
1. A disk type two phase vibration motor, comprising: circular upper and lower covers; a stator fixed to the lower cover and formed of two permanent magnets which divide a circular ring into two parts; a brush fixed to the lower cover in an inner side of the circular ring of the stator and having an included angle of 180° ; and a circular plate shape rotor formed of a circular rectifier, three rotor coils and a rotary shaft, wherein the circular plate shape rotor includes a hand fan shape coil having an included angle of 90° of both sides of three portions except for one portion of the circular plate formed of four portions and a circular rectifier formed by dividing a lower side of the rotor into four parts, the start and end terminals of three rotor coils are sequentially connected with the fourdivided circular rectifier, three rotor coils are wound in the same direction, a start terminal of the first coil is connected with the first rectifier, an end terminal of the first coil and a start terminal of the second coil are connected with the second rectifier, an end terminal of the second coil and a start terminal of the third coil are connected with a third rectifier, an end terminal of the third coil is connected with the fourth rectifier, two permanent magnets which divide the circular ring into two parts have an included angle of an arc smaller than 180°, and the brush is installed in a boundary line portion of the polar of the permanent magnet, so that the rotor is continuously rotated when a power is supplied even when the rotor is stopped in a state that the boundary line of the rotor coil and the boundary line of the polar of the permanent magnet are coincided.
2. The vibration motor of claim 1, wherein a vibrator having a larger viscosity is inserted into a coil installed in a center rotor coil among three rotor coils, or a portion of the circular plate shape rotor in which there are not coils for thereby increasing the magnitude of vibrations.
3. The vibration motor of claim 1, wherein a bearing is installed in a center potion of the circular plate shape rotor, and the rotary shaft is fixed to the lower cover.
Description:
DISK TYPE TWO PHASE VIBRATION MOTOR Technical Field The present invention relates to a disk type vibration motor of a cellular phone, and in particular to a disk type vibration motor which uses a two-phase direct current motor.

Background Art Generally, a disk type vibration motor used in a cellular phone uses a three phase direct current motor. The construction of the above type vibration motor is complicated, and since a rotor is formed in a semicircular shape and is used as a vibrator, so that the valid area of the coil is decreased. Therefore, it is impossible to obtain an enough rotation power.

Disclosure of Invention Accordingly, it is an object of the present invention to provide a disk type two phase vibration motor which overcomes the problems encountered in a conventional vibration motor.

It is another object of the present invention to provide a disk type two phase vibration motor which is capable of simplifying the construction of a disk type vibration motor for thereby minimizing the size of a motor, and increasing a

valid area of a coil for thereby increasing a rotation power.

To achieve the above objects, there is provided a disk type two phase vibration motor which includes circular upper and lower covers, a stator fixed to the lower cover and formed of two permanent magnets which divide a circular ring into two parts, a brush fixed to the lower cover in an inner side of the circular ring of the stator and having an included angle of 180°, and a circular plate shape rotor formed of a circular rectifier, three rotor coils and a rotary shaft, wherein the rotor is fixed to the upper and lower covers by the center rotary shaft, and the rotor is rotated by asymmetrically arranged three rotor coils for thereby generating vibrations.

In the present invention, the circular plate shape rotor includes a hand fan shape coil having an included angle of 90° of both sides of three portions except for one portion of the circular plate formed of four portions and a circular rectifier formed by dividing a lower side of the rotor into four parts, the start and end terminals of three rotor coils are sequentially connected with the four-divided circular rectifier, three rotor coils are wound in the same direction, a start terminal of the first coil is connected with the first rectifier, an end terminal of the first coil and a start terminal of the second coil are connected with the second rectifier, and an end terminal of the second coil and a start terminal of the third coil are connected with a third rectifier, an end terminal of the third coil is connected with the fourth rectifier.

Two permanent magnets which divide the circular ring into two parts have an included angle of an arc smaller than 180°, and the brush is installed in a boundary line portion of the polar of the permanent magnet, so that the rotor is continuously rotated when a power is supplied even when the rotor is stopped in a state that the boundary line of the rotor coil and the boundary line of the polar of the permanent magnet are coincided.

A vibrator having a larger viscosity is inserted into a coil installed in a center rotor coil among three rotor coils for thereby increasing the magnitude of vibrations.

A vibrator having a larger viscosity is inserted into a portion of the circular plate shape rotor in which there are not coils for thereby increasing the magnitude of vibrations.

A bearing is installed in a center potion of the circular plate shape rotor, and the rotary shaft is fixed to the lower cover.

Brief Description of Drawings The present invention will become better understood with reference to the accompanying drawings which are given only by way of illustration and thus are not limitative of the present invention, wherein; Figure 1 is a view illustrating the construction of a disk type two phase vibration motor according to the present invention;

Figures 2A and 2B are views illustrating the construction of a rotor which has a vibrator in a disk type two phase vibration motor according to the present invention; Figures 3A and 3Ba re views illustrating an installation state of a rectifier and rotor coil of a disk type two phase vibration motor according to the present invention; and Figures 4A, 4B, 4C and 4D are views for explaining an operation principle of a disk type two phase vibration motor according to the present invention.

Best Mode for Carrying Out the Invention The present invention will be explained with reference to the accompanying drawings.

Figure 1 is a view illustrating the construction of a disk type two phase vibration motor according to the present invention. As shown therein, a disk type two phase vibration motor according to the present invention includes a disk type rectifier 3, a rotor coil 1 formed of three coils on an upper portion of the rectifier, and a stator 2 formed of a circular ring shape permanent magnet having two polar on a lower portion of the rectifier.

A lower cover 9 is attached on a lower portion of the stator 2 formed of the permanent magnet for thereby supporting the stator. A brush 4 is attached to a circular inner center portion of the stator 2, namely, in the center portion of the

lower cover 9. A rotary shaft 6 is installed in the center portion of the rotor coil 1 and the center portion of the rectifier, and the rotary shaft 6 is fixed to a bearing 7 of the upper cover and a bearing (not shown) of the lower cover 9 of the vibration motor. Therefore, the rotor is rotated with respect to the rotary shaft. The permanent magnet which is the stator is formed of a Neodymium (Nd) magnet having a large magnetic force, and the upper and lower covers are formed of a steel core which is a magnetic material.

Figures 2A and 2B illustrate another embodiment of the present invention and illustrate the construction of a rotor of a disk type twp phase vibration motor having a vibrator installed in a rotor of a vibration motor. As shown in Figure 2A, a rotor coil is installed on a disk at a certain distance for thereby obtaining a space in which the rotor is not installed, and the vibrator is installed in the portion in which he rotor is not installed for thereby enhancing the amount of vibration. As shown in Figure 2B, the vibrator is inserted into the center coil of three rotor coils. In this embodiment, it is possible to obtain a large amount of vibration when rotating the rotor coil in the same manner as the embodiment of Figure 2A. In addition, it is possible to obtain the same effects as when the rotor is inserted by asymmetrically installing the rotor coil on the disk without inserting an additional vibrator.

Figures 3A and 3B are views illustrating the installation state of a rectifier and a rotor coil of the disk type two phase vibration motor according to the present invention. In the embodiment of Figures 3A and 3B, three rotor coils are installed

three portions except for one portion of the disk which includes four portions. At this time, the rotor coil is a hand fan shape in which an included angle between both sides when seeing from the center of the disk is 90°. Numerals () through @ represent a start terminal and an end terminal of each rotor coil, namely, a flow of the current when the power is supplied.

As shown in Figure 3B, the circular rectifier 3 in which the shape of the same is obtained by dividing a circular shape into fur parts is attached to the bottom side of the rotor coil. The start and end terminals of the hand fan-shaped rotor coil are sequentially connected to four rectifiers, and an external power is connected with a corresponding coil through the brush 4 in which the included angle is 180° and the rectifier. Namely, assuming that three rotor coils are a coil A, a coil B and a coil C, and four rectifiers are a rectifier P, a rectifier Q, a rectifier R and a rectifier S, the start terminal of the coil A is connected with the first rectifier P, and the end terminal of the coil A and the start terminal of the coil B are connected with the second rectifier Q. The end terminal of the coil B and the start terminal of the coil C are connected with the third rectifier R. In addition, the end terminal of the coil C is connected with the fourth rectifier S.

Figures 4A, 4B, 4C and 4D are views for explaining the operation principle of the disk type two phase vibration motor according to the present invention. As shown therein, the rectifiers and rotator coils are installed with respect to the permanent magnet, stator, based on the rotation of the rotor in a sequence of

Figures 4A, 4B, 4C and 4D.

As shown in Figure 4A, the flow of the current is as follows. Namely, the current flows in the sequence of the start terminal O of the coil A, the end terminal O of the coil A, the start terminal @ of the coil B, the end terminal @ of the coil B, the third rectifier R, and the brush. At this time, since the magnetic field of the polar N of the permanent magnet, and the magnetic field of the coil A and the coil B are repulsive to each other, as the rotor is rotated, the arrangement of the rectifier and rotor coil is changed to the arrangement of Figure 4B.

As shown in Figure 4B, the current flows in the sequence of the brush, the second rectifier Q, the start terminal @, the end terminal of the coil B, the start terminal of the coil C, the end terminal of the coil C, the fourth rectifier S, and the brush. At this time, since the magnetic field of the polar N of the permanent magnet and the magnetic fields of the coil B and the coil C are repulsive each other, the rotor is rotated, and the arrangement of the rectifier and the rotor is changed like Figure 4C.

As shown in Figure 4C, the current flows in the sequence of the end terminal @ of the coil B, the start terminal O of the coil B, the end terminal O of the coil A, the first rectifier P and the brush. At this time, since the magnetic field of the polar S of the permanent magnet and the magnetic fields of the coil B and the coil A are repulsive each other, the rotor is rotated, and the arrangement of the rectifier and the rotor are like Figure 3D.

As shown in Figure 4D, the current flows in the sequence of the brush, the fourth rectifier S, the end terminal @ of the coil C, the start terminal of the coil C, the end terminal (D of the coil B, the start terminal @ of the coil B, the second rectifier Q, and the brush. At this time, since the magnetic field of the polar S of the permanent magnet and the magnetic fields of the coil C and the coil B are repulsive each other, the rotor is rotated, and the rectifier and the rotor are arranged like Figure 4a.

The rotor is rotated based on the above-described operation, and two permanents which divide the circular ring into two parts has an included angle of arc smaller than 180°, and the brush is installed in a boundary portion of the polar of the permanent magnet, so that the boundary line of the rotor and the boundary line of the permanent magnet are coincided. Therefore, even when the rotor is stopped, the rotor is continuously rotated by re-supplying the power.

Accordingly, the disk type two phase vibration motor according to the present invention includes a simplified construction and a small and light system compared to the three phase vibration motor. In addition, the valid area of the rotor coil which attributes the rotation operation is increased for thereby increasing the rotation force and generating an enough vibration.

As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the

details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.