KR100432608B1 - Coin type vivrating motor and method of connecting commutator and coil - Google Patents

Abstract

The present invention relates to a coin type vibration motor and a method of connecting a commutator and a coil.

The present invention includes a stator having a permanent magnet; A rotor having a coil fixed to an upper surface of the upper substrate rotatably mounted with respect to the stator, an eccentric weight eccentrically positioned on the upper substrate, and an insulator made of resin for integrally supporting the armature and the eccentric weight; And a current path forming means including a brush and a commutator for forming a current supply path to the armature, wherein the permanent magnet 116 is magnetized into four poles in the circumferential direction; The coil is composed of a first coil 124 wound in a single wire, a second coil 125 and a third coil 126 wound in a double line coaxially; The commutator 134 is a commutator piece is attached to the bottom surface of the upper substrate 121 in the circumferential direction of the rotor (120); The brush 132 is attached to the stator 110, characterized in that connected to the commutator 134.

Accordingly, the present invention can minimize the torque ripple and have the same starting torque regardless of the stop position of the rotor, as well as add a DUMMY connection to obtain a large torque.

Description

Coin Type Vibration Motor and How to Connect Commutator and Coil {COIN TYPE VIVRATING MOTOR AND METHOD OF CONNECTING COMMUTATOR AND COIL}

The present invention relates to a coin-type vibration motor, and more particularly, to minimize the torque ripple to have the same starting torque regardless of the rotor stop position, as well as to increase the generated torque by adding a DUMMY connection to improve the amount of vibration. The present invention relates to a doll vibration motor and a method of connecting a commutator and a coil.

BACKGROUND ART Coin-type vibration motors used in small wireless paging devices and mobile telephones are known in which a rotor has an eccentric structure.

Also, in recent years, with the miniaturization of mobile phones and the like, many coin-type vibration motors having one coil or two coils have been proposed in order to have a smaller size and a higher eccentric effect than conventional vibration motors.

In the vibrating motor, most of the four commutator pieces are arranged in the circumferential direction, and commutator pieces of the commutator located in opposite directions to each other are commonly connected.

At the same time, the start and terminal ends of the coil are connected to adjacent commutator pieces, respectively, to supply current to the coil through a brush disposed at a 90 ° angle.

Thus, as the rotor rotates, the direction of the current flowing through the coil by the brush and commutator is reversed and the rotation is maintained in one direction.

However, in such a motor, adjacent commutator pieces are short-circuited to one brush in that the direction of the current flowing through the coil is changed. As a result, there is a dead point where the brush is not connected to any part of the commutator (usually between neighboring commutator pieces) so that such a short circuit of the power supply does not occur, and the next rotation when the rotor stops at this dead point At this time, no current flows through the coil, and starting is impossible.

Therefore, there have been attempts to adjust the starting position with the iron pins in order to prevent the stop of the rotor at these dead points, but the existence of the iron pins itself has various problems such as increasing the rotational load.

On the other hand, Publication No. 10-2001-0078301 (published: 2001.08.20) has been proposed a direct current vibration motor to solve the problem.

1 to 5, the conventional coin-type vibration motor disclosed in Publication No. 10-2001-0078301 is magnetized in the axial direction to have a magnetic pole in a plurality of positions in the circumferential direction to have a ring structure or a ring structure A stator formed of disposed permanent magnets; An armature positioned opposite the magnetic screen of the permanent magnet; Eccentric weights that cause vibrations during rotation; And a rotor having a resin insulator for unifying the armature and the eccentric weight, the rotor being rotatably fixed relative to the stator. And a current path forming means including a brush and a commutator for forming a current path for supplying the armature with a current whose polarity is inverted continuously as the rotor rotates.

The armature 22 has a first coil 24 (outer coil) and a second coil 25 (inner coil) wound coaxially, and a third coil disposed adjacent to the coils 24, 25 in the circumferential direction. (Starting coil: 26).

For example, as illustrated in FIGS. 3 and 4, the first coil 24, the second coil 25, and the third coil 26 are connected in a star connection manner.

The commutator 23 is composed of six commutator pieces, and commutator pieces located opposite to each other are connected to each other, and the pair of commutator pieces connected to each other is one end of the first coil 24, one end and the second coil 25. One end of each of the three coils 26 is connected, and the other ends of the coils 24, 25, and 26 are commonly connected.

Current is supplied from the brushes 14 and 15 arranged with a spatial phase difference of 90 ° with respect to the commutator 23. The brushes 14, 15 are sequentially connected to the commutator 23 connected to one end of each of the first to third coils 24, 25, 26 as the rotor 2 rotates.

As a result, as shown in FIG. 3, when the brush 14 (or 15) is located at the boundary of the commutator piece of the commutator 23, the electric current is applied to the power source → the brush 14 → the commutator 23 → the first to the first. 3 coils (24, 25, 26) → commutator (23) → brush (15) flows in the path of the ground, so that the rotor is rotated.

In addition, as shown in FIG. 4, when the brushes 14 and 15 come into contact with each of the commutator pieces of the commutator 23, the current is changed from the power source → the brush 14 → the commutator 23 → the first to third coils ( At least two of the coils 24, 25 and 26 flow in the path of the commutator 23 → brush 15 → ground, so that the rotor rotates.

FIG. 5 is a torque waveform diagram illustrating the operation of the DC vibration motor, and a portion indicated by hatched lines in FIG. 5 indicates a current supply section.

Referring to Fig. 5, in the conventional coin type vibration motor, current is energized almost continuously through two or more coils, no matter which angle the armature 41 is set to.

That is, in the conventional coin-type vibration motor composed of three coil types, at least two coils of the coils 24, 25, and 26 are separated even when the divided pieces of the adjacent commutator 23 are short-circuited through the brushes 14 and 15. The short-circuit current does not flow because it can be interposed between power supplies without any problem.

Therefore, since the space | interval between adjacent divided pieces can be made as narrow as possible, the dead point which is not energized can be made zero. As a result, it is possible to prevent a phenomenon in which an inoperable state occurs without energizing at start-up.

However, the conventional coin-type vibration motor is a three-phase driving system in which six commutator pieces and three coils are star connected.

Accordingly, the conventional coin-type vibration motor has a problem in that the torque ripple is large according to the stop position of the rotor, so that the fluctuation range of the starting torque is large.

In addition, when the coin-type vibration motor is downsized, there is a problem that the starting torque cannot be increased by a certain amount or more.

The present invention is to overcome the above-mentioned problems, the object of the present invention is to minimize the torque ripple coin-type vibration motor and commutator and coil connection method that can maintain a constant starting torque regardless of the stop position of the rotor To provide.

In addition, another object of the present invention is to provide a coin-type vibration motor and a method of connecting the commutator and the coil to increase the generated torque by adding a DUMMY connection.

As an example of a method of connecting a coin-type vibration motor and a commutator and a coil according to the present invention for achieving the object of the present invention, the present invention has a ring-shaped structure is magnetized in the axial direction to have a magnetic pole in a plurality of positions in the circumferential direction A stator having permanent magnets arranged in a ring or ring structure; A coil fixed to an upper surface of the upper substrate rotatably mounted with respect to the stator and positioned to face the magnetic screen of the permanent magnet, an eccentric weight that is eccentrically positioned on the upper substrate and generates vibration, and the armature and the eccentricity A rotor having an insulator made of resin for integrally supporting the weight; And a current path forming means including a brush and a commutator for forming a current path for supplying the armature with a current whose polarity is continuously reversed as the rotor rotates, wherein the permanent magnet is Magnetized into four poles in the circumferential direction; The coil comprises a first coil wound in a single line, and a second coil and a third coil wound in a double line coaxially and disposed adjacent to the first coil in the circumferential direction; The commutator has an even number of commutator pieces connected in common between oppositely positioned commutator pieces attached to the bottom surface of the upper substrate in the circumferential direction of the rotor, and each pair of commutator pieces is connected to one end and the common end of the coil; The brush is attached to the stator, characterized in that connected to the commutator with a spatial phase difference of 90 °.

1 is an exploded perspective view showing a conventional coin-type vibration motor,

2 is a plan view showing a conventional coin-type vibration motor,

3 is a circuit diagram illustrating a conventional coin-type vibration motor commutator and coil connection method and a state in which one brush is in contact with two commutator pieces simultaneously;

4 is a circuit diagram illustrating a conventional coin-type vibration motor commutator and coil connection method and a state in which each brush is in contact with one commutator piece;

5 is a relationship diagram showing the relationship between the generated torque and time of a conventional coin-type vibration motor,

6 is a plan view showing a stator of the coin-type vibration motor according to the present invention;

7 is a cross-sectional view taken along line AA ′ of FIG. 6;

8 is a plan view showing a rotor of the coin-type vibration motor according to the present invention,

9 is a cross-sectional view taken along line B-B 'of FIG. 8;

10 is a bottom view of a rotor having a commutator composed of eight commutator pieces as one embodiment according to the present invention;

11 is a connection diagram showing a method of connecting a commutator and a coil composed of eight commutator pieces according to one embodiment of the present invention;

12 is a relation diagram showing starting torque for each phase of a rotor having a commutator composed of eight commutator pieces as one embodiment according to the present invention;

13 is a connection diagram showing a method of connecting a commutator and a coil composed of ten commutator pieces according to one embodiment of the present invention;

Fig. 14 is a relation diagram showing starting torque for each phase of a rotor having a commutator composed of ten commutator pieces as one embodiment according to the present invention.

<Description of Symbols for Main Parts of Drawings>

110: stator 112: bracket

114: lower substrate 116: permanent magnet

118: lead wire 119: axis of rotation

120: rotor 121: upper substrate

124: first coil 125: second coil

126: third coil 127: insulator

128: eccentric weight 129: bearing

132: brush 134: commutator

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

6 to 14, the connection structure of the coin-type vibration motor commutator and the coil according to the present invention is shown.

The coin-type vibration motor according to the present invention is electrically inverted according to the rotation of the rotor by electrically connecting the stator 110, the rotating member, the rotor 120, the rotating member, and the stator 110 and the rotor 120 (120). It consists of a current path forming means for supplying a current.

The stator 110 is attached to the lower substrate 114 and the lower substrate 114 printed with a circular flat bracket 112, a circuit attached to the upper surface by bonding or the like, in the axial direction It includes a donut-shaped permanent magnet 116 magnetized into four poles.

In addition, the upper portion of the bracket 112 is covered by a cap-shaped case (not shown in the figure) which is opened downward, the bracket 112 and the case is connected by the rotary shaft 119 is firmly welded or forced by fitting Combined.

The rotor 120 rotatable with respect to the rotor is mounted on the rotation shaft 119 of the stator.

The rotor 120 is positioned to face the magnetic screen of the permanent magnet on the upper substrate 121 that is rotatably fixed to the rotation shaft 119 relative to the stator 110 and the upper surface of the upper substrate 121. The coils 124, 125 and 126, an eccentric weight 128 that is eccentrically positioned adjacent to the coils 124, 125 and 126 on the upper surface of the upper substrate 121 to generate vibrations, and the coils 124, 125, 126 and the eccentric weight 128 are integrated. It has an insulator 127 made of resin for supporting it.

The coils 124, 125 and 126 may include a first coil 124 wound in a single wire; It is composed of a second coil 125 and a second coil 126 that are wound in a double line coaxially and disposed adjacent to the first coil 124 in the circumferential direction.

The current path forming means includes a commutator 134 and a brush 132 in contact therewith, according to the rotation of the rotor 120 to the coils 124, 125, 126 through the lead wire 118 from a current source not shown in the drawing. Supply the inverting current.

The commutator 134 is arranged such that several commutator pieces are minutely spaced apart from the bottom surface of the upper substrate 121 to form a circular shape as a whole.

One end of the brush 132 is attached to the lower substrate 114 and the other end is connected to the commutator 134 with a spatial phase difference of 90 °.

As an embodiment according to the present invention having the configuration as described above, the structure and the connection of the commutator and the coil of the coin-type vibration motor are as follows.

Referring to Fig. 10, the commutator consists of eight commutator pieces, and each pair of opposing commutator pieces is connected in common.

That is, the commutator piece C1 and the commutator piece C5, the commutator piece C2 and the commutator piece C6, the commutator piece C3 and the commutator piece C7, and the commutator piece C4 and the commutator piece C8 are connected to each other by a circuit formed on the upper substrate 121.

11 shows the connection of the commutator element and the coil according to the present embodiment.

Referring to FIG. 11, the commutator piece C1 (or C5) is connected to one end 141 of the second coil 125, and the commutator piece C2 (or C6) is the other end of the second coil 125 and the first coil 124. One end is connected to the common end 142 connected, the commutator piece C3 (or C7) is connected to the common end 143 connected to the other end of the first coil 124 and one end of the third coil 126, and finally The commutator piece C4 (or C8) is connected to the other end 144 of the third coil 126.

On the other hand, Figure 12 shows the starting torque according to the phase of the coin-type vibration motor according to the embodiment shown in order of the combined torque of the first coil, the second coil, the third coil and the entire coil.

The relationship between the commutator 134 and the brush 132, and thus the energization and torque relationship according to the phases of the rotor 120 with reference to FIGS. 11 to 12 are as follows.

When the rotor 120 is in the 0 ° phase, the brush 132 is positioned between the commutator pieces C1 and C2 and between the commutator pieces C3 and C4, so that the terminals 141 and 142 are shorted, and the terminals 143 and 144 are shorted. do.

Therefore, the current does not flow in the second coil and the third coil, but only in the first coil, and the starting torque is the maximum torque generated by the first coil.

Next, when the rotor 120 is located between phase 0 ° and phase 45 °, the brush 132 is connected to the commutator piece C1 and C3, so that the current flows through the second coil to the first coil.

Therefore, the total starting torque is a combination of the torque generated by the first coil and the torque generated by the second coil.

On the other hand, when the rotor 120 is located at 45 ° phase, the brush 132 is positioned between the commutator pieces C8 and C1 and between the commutator pieces C2 and C3, so that the terminals 141 and 144 are short-circuited and the terminals 142 and Terminal 143 is shorted.

Therefore, the current does not flow in the first coil, flows simultaneously in the second coil and the third coil, and the total torque is a combination of the second coil and the third coil torque having the maximum values, respectively.

When the rotor 120 is between the phase 45 ° and the phase 90 °, the brush 132 is connected to the commutator piece C8 and C2, so that the current flows through the third coil to the first coil.

Therefore, the total starting torque is a combination of the torque generated by the first coil and the torque generated by the third coil.

Further, when the rotor is positioned at 90 °, the brush 132 is positioned between the commutator pieces C7 and C8 and between the commutator pieces C1 and C2, so that the terminals 143 and 144 are short-circuited, and the terminals 141 and 142 are short-circuited. Is short-circuited.

Therefore, the current does not flow to the second coil and the third coil, but only to the first coil, and the total starting torque is the maximum torque generated by the first coil.

As described above, not only when the brush 132 is connected to the two commutator pieces but also when the rotor 120 is located at phases 135 °, 180 °, 225 °, etc. and the commutator pieces are shorted, at least the first coil is energized. Therefore, the rotor can be started at any position.

In addition, referring to FIG. 12, each of the coils has a torque ripple in which torque gradually decreases as the phase changes, but the total starting torque is a combination of the torques generated by the coils 124, 125, and 126. The starting torque is almost constant regardless of the rotor position.

13 to 14 illustrate a structure of a commutator and a coil of a coin-type vibration motor and a connection method thereof according to another embodiment of the present invention.

Although the commutator according to the present embodiment is not shown in the drawing (see FIGS. 10 and 13), the commutator is composed of ten commutator pieces, and each pair of opposing commutator pieces is connected in common.

That is, the commutator piece C1 and commutator piece C6, commutator piece C2 and commutator piece C7, commutator piece C3 and commutator piece C8, commutator piece C4 and commutator piece C9, and commutator piece C5 and commutator piece C10 are formed on the upper substrate 121. Interconnected by circuits.

In addition, Fig. 13 shows the connection of the commutator piece and the coil according to the present embodiment.

Referring to FIG. 13, the commutator piece C3 (or C8) is connected to one end 151 of the second coil 125, and the commutator piece C2 (or C7) is the other end of the second coil 125 and the first coil 124. One end is connected to the common end 152 connected, and the commutator piece C1 (or C6) and the commutator piece C5 (or C10) are simultaneously connected to the other end of the first coil 124 and the third coil 126. 153, and finally, the commutator piece C4 (or C9) is connected to the other end 154 of the third coil 126.

Here, the commutator piece C1 connected to the common terminal 153 is due to a dummy pattern.

On the other hand, Figure 14 shows the starting torque according to the phase of the coin-type vibration motor according to the embodiment shown in order of the combined torque of the first coil, the second coil, the third coil and the entire coil.

The relationship between the commutator 134 and the brush 132, and thus the energization and torque relationship according to the phase of the rotor 120 with reference to FIGS. 13 to 14 will be described below.

First, when the rotor 120 is located between phase −9 ° and phase 9 °, the brush 132 is connected to the commutator pieces C2 and C10 so that current flows only in the first coil located between the terminals 152 and 153. do.

Therefore, the total starting torque is the torque generated by the first coil.

In addition, when the rotor 120 is located between the phase 9 ° and the phase 27 °, the brush 132 is connected to the commutator pieces C3 and C10 so that current flows between the terminal 151 and the terminal 153 through the second coil and the first coil. To flow.

Therefore, the total starting torque is torque generated by the first coil and torque generated by the second coil.

On the other hand, when the rotor 120 is located at the 9 ° phase, the brush 132 is positioned between the commutator pieces C2 and C3 and on the commutator piece C10, so that the terminals 151 and the terminal 152 are short-circuited and the phase 9 ° is moved back and forth. The torque generated in the first coil decreases stepwise as the resistance increases due to the second coil connected in series with the first coil, and in the second coil, the torque reduced by the first coil occurs stepwise.

Next, when the rotor 120 is located between the phase 27 ° and the phase 45 °, the brush 132 is connected to the commutator pieces C3 and C1, so the current is the same as when the rotor is located at the phase 27 ° to the phase 27 °. Thus, the terminal 151 and the terminal 153 flow through the second coil to the first coil.

Therefore, the total starting torque is the torque generated by the first coil and the torque generated by the second coil, and no stepwise change of torque occurs before and after the phase 27 °.

Subsequently, when the rotor 120 is positioned between phase 45 ° and phase 63 °, the brush 132 is connected to the commutator piece C4 and C1 so that current flows only in the third coil located between the terminal 154 and the terminal 153.

On the other hand, when the rotor 120 is positioned at 45 ° phase, the brush 132 is positioned between the commutator pieces C4 and C3 and on the commutator piece C1, so that the terminals 151 and 152 are short-circuited and the phase 45 ° is moved back and forth. Torque generated in the first coil and the second coil is 0, and in the third coil, the torque reduced by the first coil and the third coil is generated stepwise.

As described above, FIG. 14 shows that the torque generated by the coil changes stepwise before and after the rotor phases 63 °, 81 °, 99 °, and the like, and the overall torque, which is their synthesis as a whole, is constant. .

The coin-type vibration motor according to the present embodiment has a starting torque at any position where the rotor stops, and since the total starting torque is a combination of the torques generated by the coils 124, 125 and 126, the total starting torque is almost irrespective of the position of the rotor. It will have a constant value.

In addition, the coin-type vibration motor according to the present embodiment can increase the generated torque by the coil by adding a DUMMY pattern connection.

As described above, in the method of connecting the commutator and the coil of the coin-type vibration motor according to the present invention, the first coil is energized irrespective of the phase, and the second coil and the third coil are alternately energized at 45 ° so that torque ripple is applied. By minimizing this, there is an advantage of having the same starting torque regardless of the stop position of the rotor.

In addition, the method of connecting the commutator and the coil of the coin-type vibration motor in which the DUMMY connection is added according to the present method has an advantage of improving the amount of vibration by increasing the generated torque.

What has been described above is just one embodiment for carrying out the method of connecting the commutator and the coil of the coin-type vibration motor according to the present invention, the present invention is not limited to the above embodiment, it is claimed in the claims As will be apparent to those skilled in the art to which the present invention pertains without departing from the gist of the present invention, the technical spirit of the present invention is intended to the extent that various modifications can be made.

Claims (5)

A stator having a permanent magnet magnetized in an axial direction to have magnetic poles at a plurality of positions in the circumferential direction and having a ring-shaped structure or arranged in a ring-shaped structure; A coil fixed to an upper surface of the upper substrate rotatably mounted with respect to the stator and positioned to face the magnetic screen of the permanent magnet, an eccentric weight that is eccentrically positioned on the upper substrate and generates vibration, and the armature and the eccentricity A rotor having an insulator made of resin for integrally supporting the weight; And a current path forming means including a brush and a commutator for forming a current path for supplying the armature with a current whose polarity is continuously reversed as the rotor rotates. The permanent magnet 116 is magnetized into four poles in the circumferential direction, The coil comprises a first coil 124 wound in a single wire; It is made of a second coil 125 and a third coil 126 which is wound in a double line coaxially and disposed adjacent to the first coil 124 in the circumferential direction. The commutator 134 has an even number of commutator pieces commonly connected to opposite commutator pieces, which are commonly connected to the bottom surface of the upper substrate 121 in the circumferential direction of the rotor 120, and each pair of commutator pieces is connected to the coils 124, 125, and 126. Is connected to one end and the common end of The brush 132 is attached to the stator 110, the coin-type vibration motor, characterized in that connected to the commutator with a phase difference of 90 °. The method of claim 1, The commutator 134 is a coin-type vibration motor, characterized in that the pair of commutator pieces are connected in common to the eight commutator pieces are positioned in opposition. The method of claim 2, Each commutator pair pair has one end of the second coil 141, a common end 142 to which the other end of the second coil and the first coil are connected, a common end 143 to which the other end of the first coil and the third coil are connected, and How to connect a commutator and a coil connected to each of the three coils (144) in the rotational direction of the rotor. The method of claim 1, The commutator 134 is a coin-type vibration motor, characterized in that the ten commutator pieces are opposed to each other in common connection consisting of five pairs of commutator pieces. The method of claim 4, wherein Each commutator pair pair is connected to one end of the second coil 151, the common end 152 to which the other end of the second coil and the first coil are connected, the common end 153 to which the other end of the first coil and the third coil is connected, and the first coil. And a common end (153) connected to the other end of the coil and one end of the third coil, and the other end (154) of the third coil in order of rotation direction of the rotor.