KR200246187Y1 - Flat type vibration motor - Google Patents

Abstract

The present invention relates to a flat vibration motor used in a mobile communication terminal, etc. The present invention is a rotor, a stator inserted into the case, a rotor including a plurality of armature coils and commutator unit inserted into the case, In the flat vibration motor including a brush installed in the case for supplying a current to the commutator unit, the armature coil is trapezoidal shape, three are formed of the first armature coil, the second armature coil, the third armature coil, The arrangement angle of the armature coil and the third armature coil is 120 ° ± 3 ° Is installed.

As described above, the flat vibration motor according to the present invention has a trapezoidal shape in which the armature coil shape is similar to the magnet shape of one pole among the eight permanent magnets, and has a phase angle of 12 °, and the first armature coil and the third armature coil. This arrangement angle is installed to have a 120 °, the magnetization angle of the permanent magnet magnetized to the case is installed at 7.5 ° bar, compared to the conventional flat vibration motor, while the rotational speed is improved about 15% under the same conditions, but excellent vibration force Can be obtained.

Description

Flat type vibration motor

The present invention relates to a flat vibration motor, and more particularly, to a flat vibration motor used for a mobile communication terminal, such that an incoming signal is detected by vibration.

With the recent development of communication technology, one of the most widely distributed to the public is a mobile communication terminal. These mobile communication terminals are getting smaller and smaller, which makes them easy to carry and can be used for voice and data communication anytime, anywhere. It is true.

Since the mobile communication terminal can communicate in a public place such as a library or a conference room unlike a general landline telephone, a separate incoming call signal is required so that only a user can know in addition to a sound signal such as a bell sound.

Therefore, in order to implement this, conventionally, a method of allowing a user to detect an incoming signal by vibration is mainly used, which is implemented by a vibration motor, and particularly by a flat vibration motor in the case of a thin mobile communication terminal. do.

The conventional flat vibration motor is composed of a case (Case), a stator fixed inside the case, and a rotor rotated by the interaction with the stator, the rotor is a circular rotor body, and A rotating shaft formed at the center of the rotor body, a commutator unit mounted on one side of the rotor body to change the flow of current, and an armature coil mounted on the other side of the rotor body to which current is applied. It is composed of

At this time, the stator of the conventional flat vibration motor is formed of eight-pole permanent magnets alternately located between the N pole and the S pole so that the magnetization angle is precisely magnetized at the center of the case at a magnetization angle of 0 °, and the armature coil of the rotor has three triangular shapes. The rotor body is disposed at one side in one direction of the rotor body, but is individually arranged to have a placement angle of 120 ° while having a phase angle of 60 °.

In the conventional flat vibration motor configured as described above, when a current is applied to the commutator unit, the current is transmitted to the armature coil. Accordingly, a predetermined force such as attraction and repulsive force is generated between the armature coil and the permanent magnet. The motor is rotated at a predetermined speed, and the motor is vibrated.

However, the conventional flat vibration motor configured as described above is composed of an armature coil having a triangular shape with a phase angle of 60 ° and an arrangement angle of 120 °. Not only this is weak, but the rotational speed is lowered compared to the applied value of the current in the arrangement of the armature coil and the permanent magnet.

Accordingly, the present invention has been made in view of such a problem, and an object of the present invention is to provide a flat vibration motor having a higher rotational speed than the conventional condition under the same conditions while having a high degree of eccentricity of the rotor.

1 is an exploded perspective view showing an embodiment of a flat vibration motor according to the present invention.

FIG. 2 is a cross-sectional view of the flat vibration motor shown in FIG. 1. FIG.

Figure 3 is a plan view showing a rotor used in the flat vibration motor according to the present invention.

Figure 4 is a rear view showing the rotor used in the flat vibration motor according to the present invention.

Figure 5 is a plan view showing a state in which the stator is magnetized to the bracket according to the present invention.

The present invention for realizing the above object is a stator, a stator made of a permanent magnet inserted and fixed in the case and having a plurality of alternating N and S poles, and inserted into the case and rotated, and a plurality of armature coils and the armature A flat vibration motor comprising a rotor including a commutator unit connected to a coil, and a brush installed in a case to supply current to an armature coil through a commutator unit,

The armature coil has a trapezoidal shape, and three of the first armature coil, the second armature coil, and the third armature coil are formed, and the first armature coil, the second armature coil, and the third armature coil may be disposed continuously in the rotor. At this time, the placement angle formed by the distance between the first armature coil and the third armature coil is 120 ° ± 3 °. Characterized in that installed.

Further, the phase angle formed by the trapezoid of the armature coil is characterized in that 12 ° ± 3 °.

In addition, the magnetization angle of the stator formed by the N-pole / S-pole boundary of the stator and the center line for virtually dividing the center of the case is characterized in that 7.5 °.

Hereinafter, an embodiment of the flat vibration motor according to the present invention with reference to the drawings in detail.

1 is a perspective view showing an embodiment of a flat vibration motor according to the present invention, referring to FIG. 1, the flat vibration motor 100 according to the present invention is generally viewed as a case (Case) 130 and the case 130. It consists of a stator 170 and a rotor 150 inserted therein.

In more detail, the case 130 is divided into an upper cover Cover 110 and a lower bracket 120 coupled thereto, and has a predetermined size so that the stator 170 and the rotor 150 are seated. It provides a space and serves to protect the stator 170 and the rotor 150.

At this time, the upper cover 110 has a predetermined thickness and has a cylindrical lid shape having a lower opening, and at one end of the rotating shaft 155 of the rotor 150 to be described later in the center of one surface in a direction opposite to the lower bracket 120. The first bearing (Bearing, 115) is installed to be inserted and rotated.

In addition, the lower bracket 120 has a circular bowl shape having an upper opening so as to be coupled to the upper cover 110 described above, and the other end of the rotating shaft 155 to be described later in the center of one surface in a direction opposite to the upper cover 110. Is inserted into the second bearing 125 is rotated, and around the second bearing 125, a brush base (127) and a brush (Brush base) for applying a current to the rotor 150 129 is installed.

Here, the brush base 127 has a circular ring shape that is circumferentially installed around the second bearing 125, and one end of the brush base 127 has a predetermined length in one direction from the lower bracket 120. It protrudes and receives a current from the outside to apply a current to the brush 129, the brush 129 is a wire shape, one end is connected to the brush base 127, the other end of the rotor (to be described later) It is connected to the commutator 153 of 150 to serve to transmit the current applied from the outside through the brush base 129 to the commutator 153.

On the other hand, the rotor 150 is composed of a rotor body 152, a rotating shaft 155, a commutator unit and an armature coil 160, it is installed in the case 130 serves to rotate at a predetermined speed.

Here, the rotor body 152 serves as a body of the rotor 150 in a circular shape in which the diameter of one semicircle and the diameter of the other semicircle are different from each other, and in the center of the rotor body 152 When the 150 is rotated, a rotating shaft 155 is formed as a center. At this time, one end of the rotating shaft 155 is inserted into the first bearing 115 of the upper cover 110, the other end is inserted into the second bearing 125 of the lower bracket 120.

And, the commutator unit is the same shape as the rotor body 152, is located on one surface of the rotor body 152 and integrally coupled with the rotor body 152, the rotor 150 continues in the same direction It acts to change the flow of current as the pole of the magnetic force line to receive the force, and is connected to the brush 129 described above, and receives a current from the brush 129 to transmit to the armature coil 160 to be described later It consists of a commutator 153 which is a copper wire of and a commutator substrate 154 connected to the commutator 153 to support the commutator 153 and to control the flow of current.

In addition, the armature coil 160 is a winding of a copper wire, such as a current flowing several times in the form of a concentric circle, the armature coil 160 according to the present invention is wound in a trapezoidal shape similar to the pole shape of one of the permanent magnets to be described later, The other side of the electronic body 152, that is, the rotor body 152 in the commutator unit is not coupled to the rotor body 152 integrally coupled, one side is connected to the commutator unit and the current from the commutator unit When is applied to interact with the stator 170 to generate a force, such as attraction and repulsive force serves to rotate the rotor 150.

Here, the armature coil 160 according to the present invention, when the rotor body 152 is formed in the shape of a semicircle of two different diameters as described above, three armatures in the semicircle of the larger diameter of the two semicircles The coils 160 are continuously arranged in a radial shape. In this case, the armature coils 160 are sequentially arranged in the order of the first armature coil 156, the second armature coil 157, and the third armature coil 158. If so, the first armature coil 156 and the third armature coil 158, which are both armature coils based on the central second armature coil 157, are installed to be symmetrical with each other, particularly from the first armature coil 156 to the first armature coil 156. When the gap between the three armature coils 158 is referred to as the placement angle θ ₁ , the placement angle θ _{1 is} provided at 120 ° ± 3 °.

Here, the placement angle θ ₁ connects the center of the third armature coil 158 and the center of the rotation axis 155 in an imaginary line connecting the center of the first armature coil 156 and the center of the rotation axis 155. The angle to the imaginary line is measured. In addition, the shape of each armature coil 160 has a trapezoidal shape, as described above, each phase angle (θ ₂ ) of each armature coil 160, that is, the open angle (θ ₂ ) of the two non-parallel sides of the trapezoid It is installed at 12 ° ± 3 °.

On the other hand, the stator 170 is inserted into and fixed inside the case 130, that is, the lower bracket 120, and induces attraction and repulsive force so that the rotor 150 is rotated when a current is applied to the rotor 150. It serves as a bar, a donut-shaped circular bar shape, and the eight-pole permanent magnet in which the N pole and the S pole are alternately positioned is inserted into the lower bracket 120 to serve as the stator 170.

At this time, when the stator 170 is inserted into and fixed to the lower bracket 120, the magnetization angle θ ₃ is inserted and fixed to about 7.5 ° at the center line of the lower bracket 120. That is, the lower bracket 120 sets an imaginary line that divides the center orthogonally to each other by a horizontal line (the 'L' line in FIG. 5) and a vertical line (the 'M' line in FIG. 5) with respect to the center, When the imaginary line is referred to as the center line of the lower bracket 120, the angle between the center line and the N pole / S pole boundary line between the stator 170 is called a magnetization angle θ ₃ , and the stator 170 according to the present invention is described. The magnetizing angle of θ ₃ is fixed to be inserted by about 7.5 °.

Hereinafter, the operation and effects of the flat vibration motor 100 which is an embodiment of the present invention configured as described above will be described in detail.

When a current is applied to the flat vibration motor 100, which is an embodiment of the present invention, the current flows to the brush 129 through the brush base 127, and the brush 129 is a commutator 153 of the rotor 150. ) To transfer current to the commutator 153.

Thereafter, the current delivered to the commutator 153 flows to the armature coil 160 under the control of the commutator substrate 154, whereby a predetermined electromagnetic force is generated in the armature coil 160.

Accordingly, the predetermined electromagnetic force generated in the armature coil 160 of the rotor 150 interacts with the magnetic force of the permanent magnet, which is the stator 170 fixed to the case 130, to generate forces such as attraction and repulsive force. Thus, the rotor 150 is rotated at a predetermined speed by this force.

Hereinafter, the flat vibration motor 100 of the present invention configured as described above and the conventional flat vibration motor (not shown) will be described with reference to Table 1, which is a test data. Here, Table 1 is the data measured after each injection (Insert) injection molding the same load (0.1g) to the rotor 150, A refers to a conventional flat vibration motor, B is a flat vibration according to the present invention It refers to the motor 100.

Motor type Applied voltage Current applied Armature coil shape Armature coil number Placement angle (θ ₁ ) Phase angle (θ ₂ ) Magnet pole Magnetizing angle (θ ₃ ) Revolutions Remarks A 3.0 V 70 mA triangle 3 120 ° 60 ° 8-pole 0 ° 4500 rpm B 3.0 V 70 mA Trapezoid 3 120 ° 12 ° 8-pole 7.5 ° 5140 rpm 15% up

As described above, referring to Table 1, three trapezoidal armature coils 160 having an arrangement angle (θ ₁ ) 120 ° and a phase angle (θ ₂ ) 12 °, an 8 pole number of magnet poles, and a magnetization angle (θ ₃ ) Flat vibration motor 100 according to the present invention having a permanent magnet of 7.5 ° is about 15% increase in the number of revolutions under the same conditions (applied voltage, applied current, etc.) compared to the conventional flat vibration motor. This is because the shape of the armature coil 160 disposed according to the present invention is similar to that of one of the eight permanent magnets opposed to the armature coil 160, compared to the armature coils used in conventional flat vibration motors. It is considered to be because of the trapezoidal shape, and another reason is that the magnetization angle (θ ₃ ) of the permanent magnet, which is the stator, is twisted about 7.5 ° from the centerline of the lower bracket 120, so that the repulsive force and attraction force between the armature coil 160 and the permanent magnet are changed. It seems to be because it makes it easier.

Therefore, the flat vibration motor 100 according to the present invention according to the increase in the rotational speed as described above can obtain a superior vibration force under the same conditions as the conventional flat vibration motor. In particular, the armature coil according to the present invention is installed so that the three trapezoidal armature coils 160 have an arrangement angle (θ ₁ ) 120 °, phase angle (θ ₂ ) 12 °, the armature coil (in the rotor than the conventional armature coil ( Since the eccentricity of the 160 is higher, a superior vibration force can be obtained under the same conditions as compared with the conventional flat vibration motor.

As described above, the flat vibration motor according to the present invention has a trapezoidal shape in which the armature coil shape is similar to the magnet shape of one pole among the eight permanent magnets, and has a phase angle of 12 °, and the first armature coil and the first arm. 3 The placement angle of the armature coil is installed to have 120 °, and the magnetization angle of the permanent magnet magnetized to the case is installed at 7.5 °, even though the rotational speed is improved by about 15% under the same conditions compared to the conventional flat vibration motor. Excellent vibration force can be obtained.

Claims (3)

A rotor including a case, a stator made of a permanent magnet inserted into and fixed to the case and alternately having an N pole / S pole, and a rotor unit inserted into the case and rotating and connected to a plurality of armature coils and the armature coils. In the flat vibration motor comprising an electron and a brush provided in the case for supplying current to the armature coil through the commutator unit, The armature coil is formed by arranging a first armature coil, a second armature coil, and a third armature coil in a trapezoid shape in succession to the rotor, and the arrangement angle between the first armature coil and the third armature coil is 120. ° ± 3 ° Flat vibration motor characterized in that the. The phase angle of the trapezoid of the armature coil is 12 ° ± 3 ° Flat vibration motor, characterized in that. The flat vibration motor according to claim 1, wherein a magnetization angle of the stator formed by the N pole / S pole boundary of the stator and a center line that virtually divides the center of the case is 7.5 °.