KR101056265B1 - Vibration motor - Google Patents

Abstract

Provided is a vibration motor capable of reducing the size of the outline and improving the amount of vibration while keeping the manufacturing cost low. The vibrating motor 1 according to the present invention has a field magnet 2 made up of an even number of magnetic poles in which the N poles and the S poles are alternately arranged in the circumferential direction, the rotation shaft 7 and the rotation shaft 7. Coils are respectively formed on three salient poles each consisting of a center salient pole 4 arranged in asymmetrically and asymmetrically centered and a pair of bilateral salient poles 5 and 6 arranged at a predetermined angle θ at both sides of the center salient pole 4. A vibrating motor having an armature iron core 3 wound around (8, 9, 10), wherein the field magnet 2 is in the rotational surface of the armature core 3 and radially outward from the tip of the armature core 3. The three salient poles are arranged so that when the center salient poles 4 coincide with the magnetic pole center with respect to one field magnet, the two salient poles 5 and 6 are arranged so as to shift the magnetic pole center with respect to the other field magnets, The center 21 is provided at the position on the opposite side in the radial direction through the central salient pole 4 and the rotation shaft 7.

Description

Vibration Motors {VIBRATION MOTOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration motor, and more particularly, to a vibration motor constituted by a flat iron core motor having a three-pole poled armature.

BACKGROUND OF THE INVENTION [0002] Vibration motors driven by direct current power sources such as rechargeable batteries are used in portable telephones and pagers. The vibration motor is roughly classified into a so-called flat type and a cylindrical shape. For example, as a flat type vibration motor, as shown in Japanese Patent Laid-Open No. 2006-325384 (Patent Document 1), an iron-free core having an eccentric rotor is disclosed. The structure by the electric motor is proposed.

As shown in FIG. 12, the vibration motor 100 described in Patent Document 1 includes a board 131 having an insertion hole 131a and a plurality of pattern coils above the board 131. And a commutator 133 formed on the back surface of the board 131 and electrically connected to the pattern coil, and formed by multiples of the constant of the pattern coil. And the board 131 has a configuration with an eccentric rotor 103 eccentric with respect to the insertion hole 131a, and generates vibrations.

On the other hand, as another system of the flat vibration motor, the structure by the flat iron core motor which has a three-pole poled armature is proposed as Unexamined-Japanese-Patent No. 2005-185078 (patent document 2).

As shown in FIG. 13, the vibration motor 200 of the said patent document 2 has non-point symmetry centering around the field magnet 202 and the rotating shaft 207 which magnetized 6 pole magnetic poles in the circumferential direction. The armature core 203 wound around the coil is provided with three salient poles consisting of a central salient pole 204 and a pair of right and left both side salient poles 205 and 206 arranged unevenly, respectively, and an excitation force by the center salient pole 204. Is formed to be larger than the excitation force of the pair of left and right bilateral poles 205 and 206, and at the time of starting, the opposite pole of the field magnet 202 and the pole of the same pole are generated at the center pole 204. The armature core 203 is rotated by the repulsive force, and the vibration is generated by the mass of the armature core 203 and its unbalance.

Prior art literature

Patent Document 1: Japanese Patent Application Laid-Open No. 2006-325384

Patent Document 2: Japanese Patent Application Laid-Open No. 2005-185078

In recent years, with the further thinning of mobile telephones and the like, further thinning and miniaturization of vibration motors used for vibration generating sources of mobile telephones and the like has been requested. In addition, the vibration amount improvement and the rotational torque improvement of a vibration motor are also requested | required. However, for their realization, the manufacturing cost should not increase.

The present invention has been made in view of the above circumstances, and a flat iron core motor having a three-pole poled armature capable of reducing the size and size of the outer dimensions and improving the amount of vibration and rotational torque while keeping the manufacturing cost low. An object of the present invention is to provide a vibration motor configured.

This invention solves the said subject by the solving means as described below.

The vibrating motor includes a field magnet composed of an even number of magnetic poles in which the N poles and the S poles are alternately disposed in the circumferential direction, a central protrusion pole which has a rotation axis and is arranged asymmetrically around the rotation axis, and An oscillating motor having armature cores each of which is wound around three center poles consisting of a pair of both side poles arranged at a predetermined angle on both sides of the central salient pole, wherein the field magnet is in the rotational surface of the armature core and The three salient poles are provided at a position outside in the radial direction from the tip of the armature core, and the two salient poles are arranged in the field when the center salient poles coincide with one magnetic pole of the field magnet. It is arranged so that the magnetic pole center is shifted with respect to the other magnetic pole of the magnet, and at the position on the opposite side in the radial direction through the central salient pole and the rotation axis, And the requirement that the (重錘) is provided.

ADVANTAGE OF THE INVENTION According to this invention, in the vibration motor comprised by the flat iron core motor which has a three-pole pole-shaped armature, thickness reduction and the amount of vibration can be improved.

1A and 1B are schematic diagrams showing an example of a vibration motor according to a first embodiment of the present invention.
2A and 2B are schematic views showing the structure of an armature core and a center of the vibration motor shown in Figs. 1A and 1B.
3A to 3F are explanatory diagrams showing the rotational operation of the vibration motor shown in FIGS. 1A and 1B.
4A and 4B are schematic diagrams showing an example of a core top of a vibration motor according to a second embodiment of the present invention.
5A and 5B are schematic diagrams showing a modification of the core top of the vibration motor according to the second embodiment of the present invention.
6A and 6B are schematic diagrams showing a modification of the core top of the vibration motor according to the second embodiment of the present invention.
7A and 7B are schematic diagrams showing an example of a vibration motor according to a third embodiment of the present invention.
8A to 8F are explanatory diagrams showing the rotational operation of the vibration motor shown in FIGS. 7A and 7B.
9A and 9B are schematic diagrams showing an example of a vibration motor according to a fourth embodiment of the present invention.
10A and 10B are schematic diagrams showing an example of a vibration motor according to a fifth embodiment of the present invention.
11A and 11B are schematic diagrams showing an example of a vibration motor according to a sixth embodiment of the present invention.
12 is a schematic diagram showing an example of a vibration motor constituted by an ironless motor having an eccentric rotor according to a conventional embodiment.
Fig. 13 is a schematic diagram showing an example of a vibration motor constituted by a flat iron core motor having a three-pole poled armature according to a conventional embodiment.

An ironless motor having an eccentric rotor represented by the vibration motor 100 described in Patent Document 1 is an electric motor compared to a flat iron core motor having a three-pole poled armature represented by the vibration motor 200 described in Patent Document 2. There is a problem that thinning is difficult due to the difference in the basic structure. Specifically, since the field magnet, the substrate (commutator), the coil, and the center are provided in the axial direction of the rotation axis, in the example of the outline 10 [mm], the thickness in the axial direction is limited to about 2.7 [mm]. have. Nevertheless, the ironless motor having an eccentric rotor has a high employment rate, particularly as a vibration motor for a mobile phone. One reason for this is that it has a merit that the amount of vibration that can be generated is large compared with a flat iron core motor having a three-pole pole-shaped armature of equal size.

However, with further thinning of mobile telephones and the like, the vibration motor 1 used for vibration generating sources of mobile telephones and the like has been required to further downsize and thinner.

Conventionally, in a vibrating motor using an ironless motor having an eccentric rotor, an external dimension (diameter in the radial direction) of 10 [mm] and a thickness (dimension in the axial direction) of 2.7 [mm] is realized. However, when the thickness of the magnetic field is reduced to about 2.0 [mm], the magnetic field of the magnet and the coil are inevitably thin. Therefore, the rotational torque decreases. In addition, since the weight cannot be made thin, the amount of vibration decreases. In addition, when the field magnet becomes thinner, it becomes impossible to secure the space for installing the brush, which is inevitably a brushless motor. Since the brushless motor requires a drive circuit separately, the cost increases.

In contrast, the vibration motor according to the present embodiment is a flat iron core motor having a three-pole pole localized armature having a configuration described below, and has an outer diameter of 10 [mm] by a non-ferrous motor having a conventional eccentric rotor. It is possible to realize a thinner outer diameter of 10 [mm] and an outer dimension of 2.0 [mm] in thickness while maintaining performance equivalent to that of a vibration motor having a thickness of 2.7 [mm] and equivalent cost.

First, the vibration motor 1 which concerns on 1st Embodiment of this invention is demonstrated. This is an embodiment in the case of a DC motor in which the field magnet 2 has six poles and the commutator 11 is configured in three three phases each.

FIG. 1: is a schematic diagram of the vibration motor 1 which concerns on this embodiment, FIG. 1A is sectional drawing, and FIG. 1B is a top view.

On the inner circumferential surface of the case 20 formed in the shape of a roughly plate, a flat ring-shaped (approximately cylindrical) field magnet 2 having a total of six poles in which the N and S poles are alternately magnetized in the circumferential direction is provided. .

As for magnetization to the field magnet 2, either sine wave magnetization or trapezoidal magnetization is implemented. As the field magnet 2, a sintered magnet, a bond magnet, a plastic magnet, or the like mainly composed of ferrite, neodymium, iron, boron, or the like is used. Moreover, in order to obtain larger vibration and rotational torque as the vibration motor 1, it is suitable to use the sintered magnet which has a rare earth element as a main component.

As described above, the field magnet 2 of the present embodiment has a ring shape made up of six poles in total in which the N poles and the S poles are alternately arranged in the circumferential direction. However, in the present state, an integrally formed ring-shaped sintered magnet having a size corresponding to the vibration motor 1 having an outer diameter of 10 [mm] and a thickness of 2.0 [mm] and a magnetization direction in a radial direction is integrally formed. It is impossible or extremely difficult to do.

Therefore, in the present embodiment, the sintered magnets magnetized with one pole, two poles or three poles are bonded to each other or bonded to the case 20 to form the field magnets 2. As a result, the six-pole ring-shaped field magnet 2 can be realized.

In addition, as another example in the present embodiment, it is also possible to form the field magnet 2 by the bonded magnet using neodymium. However, the problem is that the bonded magnet has a smaller magnet strength (energy product) than the sintered magnet.

In this regard, in the conventional vibrating motor using an ironless motor having an eccentric rotor, a ring-shaped sintered magnet having a size corresponding to an outer diameter of 10 [mm] and an outer dimension of 2.7 [mm] in thickness is used. It is possible to use as a field magnet. This is because the magnetization direction of the field magnet is in the axial direction.

Here, Table 1 shows a comparison between a conventional vibration motor using a sintered magnet and a factor for determining rotational torque in the vibration motor 1 of the present embodiment using a bonded magnet. By the way, the price of both magnets is equal.

(Table 1)

Comparing the values multiplied by all the above factors for determining the rotational torque shown in Table 1,

Conventional Vibration Motor: Vibration Motor of the Present Embodiment = 1: 0.936

Becomes Although the above is an example, even when a bond magnet is used, it can be seen that the vibration motor 1 of the present embodiment illustrated in Table 1 can generate rotational torque equivalent to that of the conventional vibration motor illustrated in Table 1. have. That is, when the vibration motor 1 of this embodiment is comprised using a sintered magnet, the improvement of the rotational torque of a further layer, or miniaturization and thickness can be achieved.

Next, the armature core 3 will be described. In the radially inner side of the field magnet 2, the armature core 3 rotated about the rotating shaft 7 supported by the case 20 and the lid 17 is disposed. As described above, the field magnet 2 is provided in the rotational surface of the armature core 3 and is provided at a position outside the radial direction from the tip of the armature core 3, for example, and described in Patent Document 1, for example. Like the motor 100, compared with the structure where a coil and a field magnet overlap with the axial direction of a rotating shaft, it becomes possible to thin the dimension of an axial direction, ie, thickness. In this embodiment, since the vibration amount and rotation torque are improved by the structure mentioned later, it is possible to reduce thickness to about 2.0 [mm] while maintaining the performance equivalent to the conventional vibration motor.

Moreover, the armature core 3 is a pair arrange | positioned to the left and right of the center salient pole 4 and the said center salient pole 4, as shown to FIG. 1, FIG. 2 (FIG. 2A is sectional drawing, FIG. 2B is a top view). It has three salient poles which consist of both side salient poles 5 and 6, and is arrange | positioned non-symmetrically about the rotating shaft 7 centeringly. Incidentally, the distance (opposing gap) between the field magnet 2 and each of the salient tip ends is the same dimension.

As shown in FIG. 1, the armature core 3 has an angle θ formed between the center of the center salient pole 4 and the center of the left and right pair of both salient poles 5 and 6 with θ = 80 [. °] is set. The angle is that when the center salient poles 4 coincide with one magnetic pole of the field magnet 2 with respect to the three salient poles, both the salient poles 5 and 6 become different magnetic poles of the field magnet 2. It is arranged so that the center of magnetic poles are shifted with respect to the magnetic poles adjacent to both magnetic poles in this case (1), which prevents the impossibility of starting due to the stop position, and is suitable for rotationally adding the armature core 3 to rotation. Angle.

More specifically, since the magnetic pole of the field magnet 2 is six poles, one period of the current becomes 120 [°]. In addition, since the current is three phases of U, V, and W, there are three timings and the phases must be shifted by 40 [deg.], Respectively. Therefore, when the center salient poles 4 coincide with one magnetic pole of the field magnet 2, the two salient poles 5 and 6 are shifted by 40 [deg.], So that between the magnetic poles of the field magnets 2 ( It is necessary to dispose 10 [deg.] From the positions of the poles of the N pole and the S pole so as to arrange the two protruding poles 5,6. Here, when both the side poles 5 and 6 are provided symmetrically with respect to the center pole pole 4, it is considered that θ = 80 [°] or 100 [°]. However, as a result of the magnetic field analysis, the flux does not match at θ = 100 [°], and θ = 80 [°] is appropriate.

Here, each of the protrusions of the center protrusion 4 and the both side protrusions 5 and 6 is formed by connecting the core saws 4b, 5b, and 6b to the radially distal ends of the core bodies 4a, 5a, and 6a, respectively. do. In addition, the method of connecting and fixing is not specifically limited, As an example, it fixes by laser welding etc.

Coils 8, 9, and 10 are wound around the core body 4a of the central salient pole 4 and the core bodies 5a and 6a of the both side salient poles 5 and 6, respectively. In addition, in this embodiment, the coil diameter and the number of turns of the coils 8, 9 and 10 are made the same.

On the other hand, core tops 4b, 5b, and 6b have larger dimensions in the circumferential direction and in the axial direction than core bodies 4a, 5a, and 6a. As an example, as shown in FIG. 2, it is formed in the shape of a curved board which draws the circular arc centered on the rotating shaft 7. As shown in FIG. Thereby, it becomes possible to enlarge the opposing surface with the field magnet 2. As a result, the effective magnetic flux can be increased and the motor efficiency can be improved.

In the vibrating motor 1 having an external diameter of about 10 [mm] and a thickness of about 2.0 [mm], the core saws (slots) between the core bodies 4a, 5a, and 6a, and furthermore, the core saws serving as inlets thereof ( 4b, 5b, 6b) Since the space | interval between each other is inevitably narrow, for example, when both (core body and core top) are integrally formed, the coils 8, 9, and 10 will be called so-called "aligning contact winding ( It is a problem that it is impossible or extremely difficult to wind (machine winding) by the method.

In contrast, in the present embodiment, the core saws 4b, 5b, and 6b are formed by forming the core saws 4b, 5b, and 6b as separate members to the core bodies 4a, 5a, and 6a that are integrally formed. It becomes possible to wind the coils 8, 9 and 10 on the core bodies 4a, 5a and 6a, respectively, in a non-connected state. As a result, since the coils 8, 9, and 10 can be wound on the core saws 4b, 5b, and 6b by the "alignment tight winding" method, the rotational torque of the vibration motor 1 can be improved. In that case, since the winding of the coils 8, 9, and 10 can be performed not by "hand winding" by a human hand, but by "machine winding" by a mechanical apparatus, the increase of manufacturing cost is also suppressed. Of course, integral formation of the core bodies 4a, 5a, and 6a is also effective for suppressing the increase in cost.

Here, as a characteristic feature of the present invention, a central weight 21 is provided at a position opposite to the radial direction with the center salient pole 4 and the rotational shaft 7 interposed therebetween (see FIGS. 1 and 2). The pivot 21 rotates integrally with the armature core 3 to produce an action of generating vibration of the vibration motor 1. In other words, the vibrational action is obtained by eccentricizing the center of mass of the rotating armature core 3 with respect to the rotation axis 7 in the radial direction.

Here, since the center of mass of the armature core 3 is eccentric, even when it is in a state as it is, vibration occurs when it rotates. In this case, since the center of mass position can be further eccentric from the center of the rotation shaft 7 to the vicinity of the radial tip of the central salient pole 4, the action of increasing the amount of vibration can be obtained. However, in the method of providing the center 21 at the distal end of the central salient pole 4, the large center 21 is moved to the center salient pole 4 without reducing the rotational torque, that is, reducing the number of turns of the coil 8. In forming at the leading edge of, the restrictions of the village law are severe.

On the other hand, in this embodiment, the structure which pinches | interposes the center salient pole 4 and the rotating shaft 7, and arrange | positions the weight 21 in the position on the opposite side to radial direction is employ | adopted (refer FIG. 1 etc.). In the armature core 3, in which the center of mass is eccentric about the radial distal end of the central salient pole 4 with respect to the axis of rotation 7, the center 21 is sandwiched between the central salient pole 4 and the axis of rotation 7. Providing at the position on the opposite side of the direction usually eliminates the eccentric state and coincides with the center of mass and the center of rotation, that is, to reduce the amount of vibration. However, as a result of the research and development of the present inventors, the center portion 21 is provided by maximizing the space portion formed at the position opposite to the central protrusion 4 and the rotational shaft 7 and providing the center portion 21. Is compared with the structure provided near the front end of the center salient pole 4, and the structure which can make the center of mass more eccentric from the rotation center (rotation shaft 7) to radial direction farther was devised. As a result, it becomes possible to generate a more powerful vibration amount even when compared with the vibration motor 200 of the conventional patent document 2, and also the vibration motor of the structure which provided the center part in the center salient tip of the said vibration motor. (Details will be described later.)

In other words, it becomes possible to achieve thinner and smaller size than them, while ensuring the vibration amount equivalent to those conventional vibration motors.

In addition, in order to maximize the amount of vibration, it is appropriate to maximize the weight 21 in the space portion and to form a larger specific gravity alloy.

In this embodiment, the weight 21 is comprised using the metal material or metal alloy material with a specific gravity larger than the magnetic material which comprises the armature core 3. According to this configuration, since the mass unbalance of the armature core 3, that is, the distance between the center of mass of the armature core 3 and the rotational shaft 7 can be further increased, the rotation of the armature core 3 is accompanied. This makes it possible to make the amount of vibration generated more powerful.

Here, as the metal material or metal alloy material, for example, tungsten, bronze, brass, molybdenum, or alloys thereof can be used. In particular, the armature core 3 constituted by tungsten or tungsten alloy having a specific gravity is high. It is suitable in terms of increasing the mass unbalance of.

In the present embodiment, in order to produce the effect of improving the amount of vibration, the present embodiment is realized without increasing the axial thickness of the armature core 3, that is, without increasing the thickness of the vibration motor 1, Without expanding the armature core 3 in the radial direction, i.e. without increasing the outer diameter of the vibrating motor 1, in addition, without reducing the coil winding space, i.e. without reducing the coil excitation force. This is a very big effect in realizing it. As a synergistic effect, it becomes possible to provide a vibration motor constituted by a flat iron core motor having a three-pole poled armature capable of reducing the size and size of the dimensions and improving the amount of vibration and rotational torque.

Here, Table 2 shows a comparison between the conventional vibration motor and the vibration amount in the vibration motor 1 of the present embodiment. In addition, when the motor rotation speed is the same, the amount of vibration can be compared by comparing the amount of bias. Here, the calculation of the amount of deflection blocks the shape of the center, calculates the weight and center of each block, multiplies the weight by the distance from the rotational axis to the center, and adds the total amount of deflection as their sum. Calculated.

(Table 2)

From the above Table 2, in realizing a vibration motor having a thickness of 2.0 [mm], the vibration motor 1 according to the present embodiment brushlessizes a conventional eccentric rotor ironless motor and vibrates with a thickness of 2.0 [mm]. It is advantageous in that it is possible to generate a large amount of vibration than to achieve a motor. In addition, the advantage in terms of cost is as described above.

Next, the electrical connection structure will be described. The armature core 3 is connected to a planar commutator 11 around the rotation shaft 7. In the commutator 11, nine segments 13 (three each of three phases of U, V, and W) formed in a substantially trapezoidal shape formed by printed wiring on one surface of the insulating plate 12 are arranged in a circumference. have. A terminal portion 14 is formed in the segment 13, and the start and end of the three coils 8, 9, and 10 described above are electrically connected to the predetermined terminal portion 14. In addition, the in-phase segments 13 are electrically connected by wiring which is not shown in figure. In addition, the commutator 11 is not limited to a flat shape, and cylindrical adoption is also conceivable.

A pair of brushes 18 arranged at an opening angle of 180 [deg.] Is in sliding contact with the segment 13 of the commutator 11. This brush 18 is formed of a conductive metal plate or the like having elasticity. The base end of the brush 18 is fixed to the lid 17. This cover 17 is piped to the case 20 mentioned above. In addition, the base end of the brush 18 is connected to a DC power supply via the wiring which is not shown in figure.

Next, the fixing structure of a structural member is demonstrated. In this embodiment, as shown to FIG. 1, FIG. 2, the holder 19 is provided, and the holder 19 has the armature iron core 3, the core 21, the board | substrate 16 with commutator (commutator ( 11) is a substrate provided on the surface). More specifically, the armature iron core 3 (in this case, the core bodies 4a, 5a, 6a formed integrally) is placed in a holder 19 manufactured as a single component using a synthetic resin, and commutator The pinned portion 19a of the holder 19 is thermally deformed and caulked to fit into the sub substrate 16, thereby fixing them integrally. Subsequently, the coils 8, 9 and 10 are wound around the armature iron core 3 (here, the core bodies 4a, 5a and 6a), and then the core saws 4b and 5b to the core bodies 4a, 5a and 6a. , 6b) is fixed by laser welding or the like, followed by caulking the pivot 21 to the pin-shaped portion 19a of the holder 19. Thereafter, the start and end of the coils 8, 9, and 10 are soldered to the terminal portion 14. In this way, a rotating body is formed. Instead of the caulking, or with the caulking, fixing by adhesion may be performed.

With this configuration, for example, as in the conventional vibration motor 200 shown in FIG. 13, the manufacture of the vibration motor 1 is more convenient than the case where the armature core 3 is insert-molded to the holder 19, or the like. It is possible to obtain an effect of facilitating a reduction in manufacturing cost.

In addition, in this embodiment, the rotating shaft 7 is fixed by the case 20 and the lid 17, and the holder 19 has a structure which also serves as the bearing of the rotating shaft 7. Thereby, since it is not necessary to provide a dedicated bearing, the cost reduction effect can be acquired and the effect which makes the internal diameter of the commutator 11 small is also acquired.

Since the number of poles of the armature core 3 is small, the vibration motor 1 which has the above structure can obtain the rotation speed of several thousand to ten thousand thousand [rpm], and can obtain a big vibration by this rotation.

In general, iron core electric motors have merit that can be manufactured at a lower cost than ironless electric motors, but have a large torque ripple as a drawback. That is, while the ironless motor has a substantially constant rotational torque, the iron core motor has a large average starting torque, but a starting torque (lowest starting torque) decreases at the bottom of the torque ripple. Therefore, normally, the circumferential width of the core top of each salient pole is formed by the length equal to or smaller than the circumferential width of the magnetic pole of a field magnet, and respond | corresponds.

On the other hand, in this embodiment, the circumferential width of the core saws 4b, 5b, and 6b may be made 5 to 15 [°] larger than the circumferential width of the magnetic pole of the field magnet 2 (not shown). . This makes it possible to reduce the torque ripple, so that the average starting torque is somewhat reduced, but it is possible to increase the minimum starting torque.

In addition, from the viewpoint of starting torque improvement, a difference may be provided between the center of the magnetic pole of the field magnet 2 and the magnetic center of the central salient pole 4. For example, the magnetic center of a pair of both side poles differs from left to right, and it is also considered to be set as the structure which provides a difference in the center of both. More specifically, by forming the opening angles of the pair of both side poles 5 and 6 asymmetrically from side to side, the magnetic center of the two side poles 5 and 6 can be displaced.

In this way, by varying the magnetic centers of the two side poles from the left and the right side, since the magnetic center of the center salient pole 4 with respect to the center of the magnetic pole of the field magnet 2 is displaced, a large repulsive force can be obtained. The starting current can be reduced.

Next, Table 3 shows an example of numerical data of performance that the vibration motor 1 according to the present embodiment achieves, and the effectiveness thereof will be described. First, compared with the conventional vibrating motor by an ironless motor having an eccentric rotor, a thinning is achieved, and an amount of vibration up to an equivalent level is generated. In the vibration motor of this external dimension, the thickness of 0.7 [mm] can be said to be a remarkable effect. In other words, a larger vibration amount can be generated as long as the external dimensions are the same.

On the other hand, compared with the vibration motor by the conventional three-pole pole-distributed armature flat iron core motor, thickness reduction is achieved and the improvement of the vibration amount is achieved.

In addition, the numerical value in a table | surface does not show the threshold value which can be achieved by this invention.

(Table 3)

In general, the thinner the outer shape (thickness) is, the lower the torque and vibration amount are. However, as described above, the present invention can solve the problem.

In addition, when the minimum thickness of the height (thickness) of the small semiconductor chip to be assembled to a mobile phone on which the vibration motor 1 is mounted is 2.3 [mm], the thickness of the vibration motor 1 is enlarged to 2.2 [mm]. It is good also as a structure. According to this, compared with the structure of thickness 2.0 [mm], since the rotation torque can be enlarged further and the weight 21 can also be formed large, the effect that a vibration amount can also be enlarged can be obtained (Table | 3).

Then, the vibration motor 1 which concerns on 2nd Embodiment of this invention is demonstrated.

In this embodiment, the angle (theta) which the center of the center salient pole 4 and the center of the left and right pair of both salient poles 5 and 6 make is set to 80 [degree] <(theta) <90 [degree], and is arrange | positioned do. At this time, as described in FIG. 4 (FIG. 4A is a top view, FIG. 4B is a front view), the core tops 5b and 6b of both side protrusions 5 and 6 have diameters closer to the center protrusions. It is formed in a thick shape in the direction or the axial direction. In addition, FIG. 4 has shown the both-side salient pole 5 as an example, and both side salient pole 6 may be considered symmetrical with this (not shown).

This configuration causes the magnetic pole centers of the two salient poles 5 and 6 to be closer to the center salient pole 4 in the circumferential direction than the center line of each salient pole. That is, θ = 80 [°] is ideal as described in the above-described first embodiment, but the center of magnetic poles of the both side salient poles 5, 6 is set at 80 [°] <θ <90 [°]. = 80 [°] and equivalent position. In addition, the structure of 80 [°] <θ <90 [°] has a wider slot compared to the case of θ = 80 [°], so that the coils 8, 9, The work of winding 10) can be easily performed by a machine, thereby improving workability and reducing the manufacturing cost.

Here, the modification of the core saws 5b and 6b of the both side poles 5 and 6 is demonstrated by FIG. 5 (FIG. 5A is a top view, and FIG. 5B is a front view). The above-described effects can be obtained even when the end portion of the position far from the central salient pole 4 is formed in a thin shape in the radial direction or the axial direction. Another modification is described with reference to FIG. 6 (FIG. 6A is a plan view, and FIG. 6B is a front view). Even if the end portion of the position near the center salient pole 4 is formed relatively long in the circumferential direction, and the end of the position far from the center salient pole 4 is formed relatively short in the circumferential direction, the above-described effects can be obtained. . Of course, you may implement them simultaneously.

5 and 6 show the two salient poles 5 as an example, and the two salient poles 6 may be considered to be symmetrical with this (not shown).

Subsequently, the vibration motor 1 according to the third embodiment of the present invention will be described. This is an embodiment in the case of a DC motor in which the field magnet 2 has eight poles and the commutator 11 is composed of four three phases each. 7 is a schematic view of the vibration motor 1 according to the present embodiment, in which FIG. 7A is a sectional view, and FIG. 7B is a plan view.

Also in this embodiment, by providing the structure demonstrated below, compared with the vibration motor of 10 [mm] and thickness of 2.7 [mm], the outer diameter which is conventionally realized is a thinner outer diameter of 10 [mm] and thickness more. It is possible to realize the external dimension of 2.0 [mm].

Hereinafter, this embodiment is demonstrated centering on the difference with the said 1st Embodiment.

In the present embodiment, a flat ring-shaped field magnet (approximately cylindrical) having magnetic poles in total of eight poles in which the N poles and the S poles are alternately magnetized in the circumferential direction on the inner circumferential surface of the case 20 formed in the shape of a roughly plate shape ( 2) is provided.

However, similarly to the first embodiment, in the present state, the ring-shaped sintered magnet corresponding to the vibration motor 1 having an outer diameter of 10 [mm] and a thickness of 2.0 [mm] is integrally formed. It is impossible or extremely difficult. Therefore, in the present embodiment, the sintered magnets magnetized with one pole, two poles, or four poles are bonded to each other or bonded to the case 20 to form the field magnets 2. As a result, an eight-pole ring field magnet 2 can be realized.

In addition, as another example in the present embodiment, it is also possible to form the field magnet 2 by the bonded magnet using neodymium.

In this embodiment, as shown in FIG. 7B, the armature core 3 includes an angle θ formed between the center of the central salient pole 4 and the center of the left and right pair of both salient poles 5 and 6, and arranged at θ = 105 [°]. The angle is that when the center salient poles 4 coincide with one magnetic pole of the field magnet 2 with respect to the three salient poles, both the salient poles 5 and 6 become different magnetic poles of the field magnet 2. It is arranged so that the center of magnetic poles may be displaced with respect to each of the magnetic poles in the second to the second magnetic poles, and this is suitable for preventing the impossibility of starting due to the stop position and for further adding the armature core 3 to rotation. Angle.

In addition, in this embodiment, the clearance gap (slot) between the core main bodies 4a, 5a, and 6a, and also the clearance gap between the core saws 4b, 5b, 6b which become its inlet, are the same as the said 1st Embodiment. In comparison, it becomes possible to form large.

That is, even when the core bodies 4a, 5a, 6a and the core saws 4b, 5b, 6b are integrally formed, the coils 8, 9, 10 are wound by a so-called "align tight winding" method (machine winding). It becomes possible. This means that the armature core 3 (before winding of the coils 8, 9, 10) can be integrally formed by a press or the like, and the productivity can be improved and the cost can be reduced.

Also in this embodiment, the center 21 is provided in the position on the opposite side to the radial direction pinching the center salient pole 4 and the rotating shaft 7 (refer FIG. 7B). The operation of the pivot 21 is similar to that of the first embodiment. However, since the size of the space portion formed between the central salient pole 4 and the rotary shaft 7 at the position opposite to the radial direction is relatively smaller than that of the first embodiment, the size of the center 21 is also relatively Becomes smaller.

Next, a planar commutator 11 is connected to the armature core 3 with the rotation axis 7 as the center. In the commutator 11, 12 segments 13 (four each of three phases of U, V, and W) formed in a substantially trapezoidal shape formed by printed wirings on one surface of the insulating plate 12 are arranged in a circumference. It is. A terminal portion 14 is formed in the segment 13, and the start and end of the three coils 8, 9, and 10 described above are electrically connected to the predetermined terminal portion 14. In addition, the in-phase segments 13 are electrically connected by wiring which is not shown in figure.

In addition, in this embodiment, the opening angle of the pair of brushes 18 which make sliding contact with the segment 13 of the commutator 11 is 135 [degrees] (narrow angle side).

Subsequently, the vibration motor 1 according to the fourth embodiment of the present invention will be described. This is an embodiment in the case of a DC motor in which the field magnet 2 has four poles and the commutator 11 is formed in two three-phase locations. 9 is a schematic view of the vibration motor 1 according to the present embodiment, where FIG. 9A is a sectional view and FIG. 9B is a plan view.

Also in this embodiment, by providing the structure demonstrated below, compared with the vibration motor of 10 [mm] and thickness of 2.7 [mm], the outer diameter which is conventionally realized is a thinner outer diameter of 10 [mm] and thickness more. It is possible to realize the external dimension of 2.0 [mm].

Hereinafter, this embodiment is demonstrated centering on the difference with the said 1st Embodiment.

In the present embodiment, a flat ring-shaped field magnet (approximately cylindrical) having magnetic poles in total of four poles in which the N poles and the S poles are alternately magnetized in the circumferential direction on the inner circumferential surface of the case 20 formed in the shape of a roughly plate shape ( 2) is provided.

However, similarly to the first embodiment, in the present state, the ring-shaped sintered magnet corresponding to the vibration motor 1 having an outer diameter of 10 [mm] and a thickness of 2.0 [mm] is integrally formed. It is impossible or extremely difficult. Thus, in the present embodiment, the sintered magnets magnetized with one pole or two poles are bonded to each other or bonded to the case 20 to form the field magnet 2. As a result, the four-pole ring-shaped field magnet 2 can be realized.

In addition, as another example in the present embodiment, it is also possible to form the field magnet 2 by the bonded magnet using neodymium.

In this embodiment, as shown in FIG. 7B, the armature core 3 includes an angle θ formed between the center of the central salient pole 4 and the center of the left and right pair of both salient poles 5 and 6, and arranged at θ = 105 [°]. The angle is that when the center salient poles 4 coincide with one magnetic pole of the field magnet 2 with respect to the three salient poles, both the salient poles 5 and 6 become different magnetic poles of the field magnet 2. It is arranged so that the center of magnetic poles may be shifted with respect to each magnetic pole adjacent to the one magnetic pole in this case, and it is prevented from being disabled by the stop position, and the armature core 3 is rotated. Is the right angle.

In addition, in this embodiment, the clearance gap (slot) between the core main bodies 4a, 5a, and 6a, and also the clearance gap between the core saws 4b, 5b, 6b which become its inlet, are the same as the said 1st Embodiment. In comparison, it becomes possible to form large.

That is, even when the core bodies 4a, 5a, 6a and the core saws 4b, 5b, 6b are integrally formed, the coils 8, 9, 10 are wound by a so-called "align tight winding" method (machine winding). It becomes possible. This means that the armature core 3 (before winding of the coils 8, 9, 10) can be integrally formed by a press or the like, and the productivity can be improved and the cost can be reduced.

Also in this embodiment, the center part 21 is provided in the position on the opposite side to the radial direction pinching the center salient pole 4 and the rotating shaft 7 (refer FIG. 9B). The operation of the pivot 21 is similar to that of the first embodiment. However, since the size of the space portion formed between the central salient pole 4 and the rotary shaft 7 at the position opposite to the radial direction is relatively smaller than that of the first embodiment, the size of the center 21 is also relatively Becomes smaller.

Next, a planar commutator 11 is connected to the armature core 3 with the rotation axis 7 as the center. In the commutator 11, six segments 13 (two each of three phases of U, V, and W) formed in a substantially trapezoidal shape formed by printed wiring on one side of the insulating plate 12 are arranged in a circumference. It is. A terminal portion 14 is formed in the segment 13, and the start and end of the three coils 8, 9, and 10 described above are electrically connected to the predetermined terminal portion 14. In addition, the in-phase segments 13 are electrically connected by wiring which is not shown in figure.

In addition, in this embodiment, the opening angle of the pair of brushes 18 which make sliding contact with the segment 13 of the commutator 11 is 90 degrees (narrow angle side).

Subsequently, the vibration motor 1 which concerns on 5th Embodiment of this invention is shown to FIG. 10A and FIG. 10B (FIG. 10A is sectional drawing, FIG. 10B is a top view). The vibration motor 1 which concerns on this embodiment is a modification of the vibration motor 1 which concerns on said 4th embodiment.

As a characteristic configuration, as shown in FIG. 10B, the centerlines 5c and 6c of the pair of left and right bilateral protrusions 5 and 6 are arranged with respect to the line of θ = 105 [°] from the center of the central salient pole 4. The arrangement is parallel and close to the center salient pole 4.

According to this, the weight 21 can be formed relatively large compared with the vibration motor 1 which concerns on 4th Embodiment.

Then, the vibration motor 1 which concerns on 6th Embodiment of this invention is demonstrated. This is an embodiment in the case of a DC motor in which the field magnet 2 has a pole of two poles and the commutator 11 is configured in each one of three phases. 11 is a schematic view of the vibration motor 1 according to the present embodiment, in which FIG. 11A is a sectional view and FIG. 11B is a plan view.

Also in this embodiment, by providing the structure demonstrated below, compared with the vibrating motor of 10 [mm] and thickness of 2.7 [mm] conventionally realized, the outer diameter which is thinner is 10 [mm] and thickness more thinly. It is possible to realize the external dimension of 2.0 [mm].

Hereinafter, this embodiment is demonstrated centering on the difference with the said 1st Embodiment.

In the present embodiment, a flat ring-shaped field magnet (approximately cylindrical) having magnetic poles of a total of two poles in which the N poles and the S poles are alternately magnetized in the circumferential direction on the inner circumferential surface of the case 20 formed in the outline dish shape ( 2) is excreted. Unlike the first embodiment, when the field magnet 2 has two poles, a ring-shaped sintered magnet corresponding to the vibration motor 1 having an outer diameter of 10 [mm] and a thickness of 2.0 [mm] is used. It is possible to form integrally. This is because the magnetizing jig does not need to be inserted inside the ring.

In addition, as another example in the present embodiment, it is also possible to form the field magnet 2 by the bonded magnet using neodymium.

In the present embodiment, as shown in FIG. 11B, the center lines 5c and 6c of the pair of left and right both side poles 5 and 6 are θ = 115 from the center of the center protrusion 4 as shown in FIG. 11B. It is an arrangement parallel to the line of [°] and close to the center salient pole 4. In this arrangement, when the central salient poles 4 coincide with one magnetic pole of the field magnet 2 with respect to the three salient poles, the two salient poles 5 and 6 become different magnetic poles of the field magnet 2. It is arranged so that the magnetic pole center can be shifted with respect to the magnetic pole, and it is an angle suitable for preventing the impossibility of starting due to the stop position and for rotating the armature core 3.

In addition, in this embodiment, the clearance gap (slot) between the core main bodies 4a, 5a, and 6a, and also the clearance gap between the core saws 4b, 5b, 6b which become its inlet, are the same as the said 1st Embodiment. In comparison, it becomes possible to form large.

That is, even when the core bodies 4a, 5a, 6a and the core saws 4b, 5b, 6b are integrally formed, the coils 8, 9, 10 are wound by a so-called "align tight winding" method (machine winding). It becomes possible. This means that the armature core 3 (before winding the coils 8, 9, 10) can be integrally formed by a press or the like, and the productivity can be improved and the cost can be reduced.

Also in this embodiment, the center 21 is provided in the position on the opposite side to the radial direction pinching the center salient pole 4 and the rotating shaft 7 (refer FIG. 11B). The operation of the pivot 21 is similar to that of the first embodiment. However, since the size of the space portion formed between the central salient pole 4 and the rotary shaft 7 at the position opposite to the radial direction is relatively smaller than that of the first embodiment, the size of the center 21 is also relatively Becomes smaller.

Next, a planar commutator 11 is connected to the armature core 3 with the rotation axis 7 as the center. In the commutator 11, three segments 13 (one each of three phases of U, V, and W) formed in a substantially trapezoidal shape formed by printed wiring on one surface of the insulating plate 12 are arranged in a circumference. It is. A terminal portion 14 is formed in the segment 13, and the start and end of the three coils 8, 9, and 10 described above are electrically connected to the predetermined terminal portion 14. In addition, the in-phase segments 13 are electrically connected by wiring which is not shown in figure.

In addition, in this embodiment, the opening angle of the pair of brushes 18 which make sliding contact with the segment 13 of the commutator 11 is 180 degrees.

Subsequently, a rotation operation of the vibration motor 1 according to the first embodiment will be described with reference to FIG. 3.

As shown in Fig. 3A, a description will be given starting from a position where the circumferential center of the central salient pole 4 and the circumferential center of the opposing magnetic pole (here, the uppermost N pole in the figure) coincide. Incidentally, θ = 80 [°].

As shown in Fig. 3A, from the state in which the vibration motor 1 is stopped (state not energized by the respective coils 8, 9 and 10), both coils are energized through the commutator 11 to each coil. The S pole is provided to the salient pole 5, and the N pole is excited to the other two salient poles 6. However, at this position, since the coil 8 is not energized, the magnetic pole is not excited to the central salient pole 4. As a result, the S pole excited by one of the two side poles 5 is repelled with the S pole near the field magnet 2 and is attracted to the neighboring N pole, and the other side side pole 6 The armature core 3 displaces in the clockwise direction of the arrow by the N pole excited by being attracted to the N pole in the vicinity of the field magnet 2 and being attracted to the S pole in the vicinity. In this way, the vibration motor 1 is started.

In addition, the hatched part of the tip of each brush 18 in each figure is a contact part with the commutator 11.

The state immediately after starting is shown in FIG. 3B. The figure shows the position where the armature core 3 is rotated 5 [°] from the starting point. At this time, the magnetic pole (N pole) is excited to the central salient pole 4. In addition, the magnetic poles of both side poles 5 and 6 do not change. Thereby, the N pole of the center salient pole 4 receives the repulsion force by the N pole of the field magnet 2 in the rotation direction back, and receives the suction force by the S pole of the field magnet 2 in front of a rotation direction, and it rotates. do. The S poles of one of the two protruding poles 5 are subjected to the repulsive force by the S pole of the field magnet 2 in the rear of the rotational direction, and are subjected to rotational force under the suction force of the N pole of the field magnet 2 in the front of the rotational direction. The N poles of the other two side poles 6 are subjected to the repulsive force by the N pole of the field magnet 2 in the rear of the rotational direction, and are attracted to rotation by receiving the suction force of the S pole of the field magnet 2 in the front of the rotational direction. . In this way, the armature core 3 continues to rotate in the clockwise direction.

Further, the thick line arrow indicates that the rotational force is relatively large, and the thin line arrow indicates that the rotational force is relatively small (also in the following drawings).

The state in which the armature core 3 is rotated 20 [°] from the starting point is shown in Fig. 3C. At this time, the magnetic poles (N poles) excited by the central salient pole 4 do not change. The magnetic poles (S poles) that are excited by the two opposite poles 5 do not change. The stimulus is not excited to the other two side poles 6. Thereby, the N pole of the center salient pole 4 receives the repulsion force by the N pole of the field magnet 2 in the rotation direction back, and receives the suction force by the S pole of the field magnet 2 in front of a rotation direction, and it rotates. do. The S poles of one of the two protruding poles 5 are subjected to the repulsive force by the S pole of the field magnet 2 in the rear of the rotational direction, and are subjected to rotational force under the suction force of the N pole of the field magnet 2 in the front of the rotational direction. The rotational force does not arise in the other both side poles 6. In this way, the armature core 3 continues to rotate in the clockwise direction.

Subsequently, the state immediately after the armature core 3 is rotated 20 [°] from the starting point is shown in Fig. 3D (shown at the position of 25 [°]). At this time, the magnetic poles (N poles) excited by the central salient pole 4 do not change. The magnetic poles (S poles) that are excited by the two opposite poles 5 do not change. In addition, the direction of the current supplied to the coil 10 by the commutator 11 (segment 13) is reversed from the direction immediately before the rotation of 20 °, so that the other two side poles 6 are connected to the S pole. Become a woman. Thereby, the N pole of the center salient pole 4 receives the repulsion force by the N pole of the field magnet 2 in the rotation direction back, and receives the suction force by the S pole of the field magnet 2 in front of a rotation direction, and it rotates. do. The S poles of one of the two protruding poles 5 are subjected to the repulsive force by the S pole of the field magnet 2 in the rear of the rotational direction, and are subjected to rotational force under the suction force of the N pole of the field magnet 2 in the front of the rotational direction. The S poles of the other two side poles 6 receive a repulsive force by the S pole of the field magnet 2 in the rear of the rotational direction, and receive a suction force by the N pole of the field magnet 2 in front of the rotational direction. do. In this way, the armature core 3 continues to rotate in the clockwise direction.

The state in which the armature core 3 is rotated 40 [°] from the starting point is shown in Fig. 3E. At this time, the magnetic poles (N poles) excited by the central salient pole 4 do not change. The stimulus is not excited to the two opposite poles 5. The magnetic poles (S poles) that are excited by the other two side poles 6 do not change. Thereby, the N pole of the center salient pole 4 receives the repulsion force by the N pole of the field magnet 2 in the rotation direction back, and receives the suction force by the S pole of the field magnet 2 in front of a rotation direction, and it rotates. do. Rotational force does not occur in one of both side poles 5. The S poles of the other two side poles 6 are subjected to the repulsive force by the S pole of the field magnet 2 in the rear of the rotational direction, and are subjected to rotational force under the suction force of the N pole of the field magnet 2 in the front of the rotational direction. . In this way, the armature core 3 continues to rotate in the clockwise direction.

Subsequently, the state immediately after the armature core 3 has rotated 40 [°] from the starting point is shown in Fig. 3F (shown at the position of 45 [°]). At this time, the magnetic poles (N poles) excited by the central salient pole 4 do not change. The magnetic poles (S poles) that are excited by the other two side poles 6 do not change. In addition, the direction of the current passing through the coil 9 by the commutator 11 (segment 13) is reversed to the direction immediately before the rotation of 40 [°], so that both of the two poles 5 are N poles. Be a girl on. Thereby, the N pole of the center salient pole 4 receives the repulsion force by the N pole of the field magnet 2 in the rotation direction back, and receives the suction force by the S pole of the field magnet 2 in front of a rotation direction, and it rotates. do. The N pole of one of the both side pole electrodes 5 receives the repulsion force by the N pole of the field magnet 2 behind the rotation direction, and receives the suction force by the S pole of the field magnet 2 in the rotation direction forward, and is rotated. The S poles of the other two side poles 6 receive a repulsive force by the S pole of the field magnet 2 in the rear of the rotational direction, and receive a suction force by the N pole of the field magnet 2 in front of the rotational direction. do. In this way, the armature core 3 continues to rotate in the clockwise direction.

Thereafter, the nine segments 13 of the commutator 11 appropriately switch the energization directions to the respective coils 8, 9, and 10 for each rotation angle of 20 [°], thereby making the respective poles of the armature iron core 3 each pole. The repulsion and suction are repeated and rotationally applied to the magnetic pole of the field magnet 2. When the energization to each of the coils 8, 9, and 10 is stopped, the magnetic poles of the salient poles 4, 5, and 6 are demagnetized, and the rotation of the armature core 3 stops.

In the case where the position other than the above is the starting point, the rotational force generated between the magnetic pole of each salient pole and the field magnet 2 at the position in the middle of the above description may be regarded as the driving force.

In addition, the rotation operation of the vibration motor 1 which concerns on the said 2nd Embodiment may be considered similarly to the rotation operation of the vibration motor 1 which concerns on said 1st Embodiment.

That is, the angle θ formed between the center of the central salient pole 4 and the center of the left and right pair of both salient poles 5 and 6 is 80 [°] <θ <90 [°], but the two salient poles 5, This is because the magnetic pole center generated in 6) is equivalent to θ = 80 [°].

Subsequently, the rotation operation of the vibration motor 1 according to the third embodiment will be described with reference to FIG. 8.

As shown in FIG. 8A, a description will be given starting from a position where the circumferential center of the central salient pole 4 and the circumferential center of the opposing magnetic pole (here, the uppermost N pole in the figure) coincide. Incidentally, θ = 105 [°].

As shown in FIG. 8A, the central rotor poles are energized by energizing each coil through the commutator 11 from the state in which the vibration motor 1 is stopped (states not energized by the respective coils 8, 9, and 10). In 4), the north pole is excited, and the north pole of one of the two side protrusions 5 is excited. However, at this position, since the coil 10 is not energized, the magnetic poles are not excited to the other two side poles 6. As a result, the N pole excited on one of the two side pole poles 5 repels the N pole near the field magnet 2 and is attracted to the nearby S pole, whereby the armature core 3 moves to the arrow clock. Displace in the direction. In this way, the vibration motor 1 is started. In this position, the rotational force (moving force) does not occur in the central salient pole 4 and the other two salient poles 6.

Here, the hatched part of the tip of each brush 18 in each figure is a contact part with the commutator 11.

The state immediately after starting is shown in FIG. 8B. The figure shows that the armature core 3 is 8 [°] from the starting point.

It is shown in the rotated position. At this time, the magnetic poles (N poles) that are excited by the central salient poles 4 and the magnetic poles (N poles) that are excited by the two opposite poles 5 do not change. The N poles are excited to the other both side poles 6. Thereby, the N pole of the center salient pole 4 receives the repulsion force by the N pole of the field magnet 2 in the rotation direction back, and receives the suction force by the S pole of the field magnet 2 in front of a rotation direction, and it rotates. do. The N pole of one of the both side pole electrodes 5 receives the repulsion force by the N pole of the field magnet 2 behind the rotation direction, and receives the suction force by the S pole of the field magnet 2 in the rotation direction forward, and is rotated. At this time, the N poles of the other two side poles 6 receive the repulsive force by the N pole of the field magnet 2 in the front of the rotational direction, and the suction force of the S pole of the field magnet 2 in the rear of the rotational direction. Therefore, the rotational force is generated in the rotational direction (here clockwise) and in the reverse direction (here counterclockwise) of the armature core 3. Here, the arrow displayed corresponding to the position of each salient pole indicates that the rotation line has a relatively large rotational force, and the thin line arrow has a relatively small rotational force (also in the following drawings). That is, the rotational force (clockwise) of the relatively large central salient pole 4, the rotational force (clockwise) of one of the relatively smaller bilateral salient poles 5, and the rotational force of the other relatively smaller bilateral salient poles 6 ( Since the armature core 3 is added to the clockwise rotation by the sum of the counterclockwise direction), the clockwise rotation continues. Incidentally, the difference in the rotational force is caused by the difference in the current flowing through the coils 8, 9, and 10, the positional relationship with the opposing magnetic poles, and the like.

The state in which the armature core 3 is rotated 15 [°] from the starting point is shown in Fig. 8C. At this time, the magnetic poles (N poles) excited by the central salient pole 4 do not change. The stimulus is not excited to the two opposite poles 5. The magnetic poles (N poles) that are excited by the other two side poles 6 do not change. Thereby, the N pole of the center salient pole 4 receives the repulsion force by the N pole of the field magnet 2 in the rotation direction back, and receives the suction force by the S pole of the field magnet 2 in front of a rotation direction, and it rotates. do. At this time, the rotational force does not generate | occur | produce on one both side pole 5 and the other side side pole 6. In this way, the armature core 3 continues to rotate in the clockwise direction.

Subsequently, the state immediately after the armature core 3 is rotated 15 [°] from the starting point is shown in Fig. 8D (shown at the position of 23 [°]). At this time, the magnetic poles (N poles) excited by the central salient pole 4 do not change. The magnetic poles (S poles) that are excited by the other two side poles 6 do not change. Further, the direction of the current passing through the coil 9 by the commutator 11 (segment 13) is reversed in the direction immediately before the rotation of 15 [°], so that one of the two side pole poles 5 is the S pole. Be a girl on. Thereby, the N pole of the center salient pole 4 receives the repulsion force by the N pole of the field magnet 2 in the rotation direction back, and receives the suction force by the S pole of the field magnet 2 in front of a rotation direction, and it rotates. do. The N poles of the other two side poles 6 receive a repulsion force by the N pole of the field magnet 2 in the rear of the rotational direction, and receive a suction force by the S pole of the field magnet 2 in front of the rotational direction. do.

At this time, the S pole of one of the both side pole electrodes 5 receives the repulsive force by the S pole of the field magnet 2 in the front of the rotational direction and the suction force of the N pole of the field magnet 2 in the rear of the rotational direction. The rotational force is generated in the rotational direction (here clockwise) and in the reverse direction (here counterclockwise) of the armature core 3. However, the rotational force (clockwise) of the relatively small central salient pole 4, the rotational force (clockwise) of the other two larger salient poles 6, and the rotational force of the two relatively smaller salient poles 5 ( Since the armature core 3 is added to the clockwise rotation by the sum of the counterclockwise direction), the clockwise rotation continues.

The state in which the armature core 3 is rotated 30 [°] from the starting point is shown in Fig. 8E. At this time, the magnetic pole is not excited to the central salient pole 4. The magnetic poles (S poles) that are excited by the two opposite poles 5 do not change. The magnetic poles (N poles) that are excited by the other two side poles 6 do not change. Thereby, the north pole of the other both side poles 6 receives the repulsion force by the north pole of the field magnet 2 in the rotation direction back, and the suction force by the south pole of the field magnet 2 in front of the rotation direction is received. Pick up and rotate. At this time, the rotational force does not arise in the center salient pole 4 and the other both salient poles 6. In this way, the armature core 3 continues to rotate in the clockwise direction.

Subsequently, the state immediately after the armature core 3 is rotated 30 [°] from the starting point is shown in Fig. 8F (shown at the position of 38 [°]). At this time, the magnetic poles (S poles) that are excited by the two opposite poles 5 do not change. The magnetic poles (N poles) that are excited by the other two side poles 6 do not change. In addition, the direction of the current passing through the coil 8 by the commutator 11 (segment 13) is reversed to the direction immediately before rotation of 30 [°], so that the center salient pole 4 is excited to the S pole. do. As a result, the S pole of one of the two protruding poles 5 receives a repulsion force by the S pole of the field magnet 2 in the rear of the rotational direction, and receives the repulsive force of the N pole of the field magnet 2 in the rotational direction forward. Will be added. The N poles of the other two side poles 6 receive a repulsion force by the N pole of the field magnet 2 in the rear of the rotational direction, and receive a suction force by the S pole of the field magnet 2 in front of the rotational direction. do.

At this time, the S pole of the central salient pole 4 receives the repulsive force by the S pole of the field magnet 2 in the front of the rotational direction and the suction force of the N pole of the field magnet 2 in the rear of the rotational direction. The rotation force is generated in the direction of rotation of the iron core 3 (here clockwise) and in the reverse direction (here counterclockwise). However, the rotational force (clockwise) of one of the relatively large two-sided salient poles 5, the rotational force (clockwise) of the two relatively smaller side salients 6, and the rotational force of the relatively smaller central salient poles 4 ( Since the armature core 3 is added to the clockwise rotation by the sum of the counterclockwise direction), the clockwise rotation continues.

Thereafter, the twelve segments 13 of the commutator 11 each pole of the armature iron core 3 by appropriately switching the energization direction to each coil 8, 9, 10 for each rotation angle of 15 [°]. The repulsion force and the suction force are generated with respect to the magnetic pole of the field magnet 2. The armature core 3 is rotated in a fixed direction (here clockwise) with the total of them as the rotational force. When the energization to each of the coils 8, 9, and 10 is stopped, the magnetic poles of the salient poles 4, 5, and 6 are demagnetized, and the rotation of the armature core 3 stops.

In the case where the position other than the above is the starting point, the rotational force generated between the magnetic pole of each salient pole and the field magnet 2 at the position in the middle of the above description may be regarded as the driving force.

As described above, according to the vibration motor 1 according to the present invention, in the configuration using a flat iron core motor having a three-pole poled armature, it is possible to reduce the size and reduce the size of the outer dimensions while suppressing the increase in cost. It becomes possible and the vibration amount and rotation torque can be improved.

In addition, this invention is not limited to the Example demonstrated above, Needless to say that various changes are possible in the range which does not deviate from this invention. In particular, the number of magnetic poles of the field magnet is not limited to 2 poles, 4 poles, 6 poles, and 8 poles, and 10 poles (5 rectifiers each 5 positions), 12 poles (6 rectifiers 6 positions each),... Applicable as

Claims (12)

Field magnets comprising an even number of magnetic poles in which the N poles and the S poles are alternately arranged in the circumferential direction; A vibrating motor having an armature iron core wound around three coils each consisting of a pair of bilateral salient poles, which are spaced apart,
The overall external dimension is 10 mm or less in the radial direction, and 2.2 mm or less in the axial direction,
The field magnet is provided in the rotational surface of the armature core and at a position outside in the radial direction from the tip of the armature core,
The three salient poles are arranged such that when both the center salient poles coincide with one magnetic pole of the magnetic field magnets, the two salient poles are displaced with respect to the other magnetic poles of the magnetic field magnets,
The center salient pole and the both side salient poles each have a core body and a core top formed as separate members,
The core top has a dimension larger in the circumferential direction than the core body, and is fixedly connected to a radially distal end portion of the core body in a coil wound state.
The armature core has a shape in which the center of mass is located near the radial tip of the central salient pole with respect to the rotation axis,
And a center weight connected to the armature core in a direction opposite to the radial direction through the rotation axis and the direction in which the center of mass of the armature core is located. The method of claim 1,
The magnetic pole of the field magnet is a six pole magnetic pole,
And the predetermined angle is 80 °. delete delete The method of claim 1,
The magnetic pole of the field magnet is a six pole magnetic pole,
The predetermined angle is greater than 80 ° and less than 90 °,
The core top of each of the two protrusions has a thick end portion in a radial direction or an axial direction close to the central protrusion, or an end portion far from the central protrusion has a thin shape in a radial direction or an axial direction. The vibration motor according to claim 2, wherein the position of the magnetic pole center of each of the two salient poles is set to a shape that is equivalent to the case where the predetermined angle is 80 degrees. The method of claim 1,
The magnetic pole of the field magnet is a six pole magnetic pole,
The predetermined angle is greater than 80 ° and less than 90 °,
The core top of each of the two side protrusions is formed by the end of the position close to the central protrusion is relatively long in the circumferential direction, and the end of the position away from the center protrusion is formed relatively short in the circumferential direction, The position of the magnetic pole center is set to the shape which becomes a distribution equivalent to the case where the said predetermined angle is 80 degrees, The vibration motor characterized by the above-mentioned. The method of claim 1,
The magnetic pole of the field magnet is an 8 pole magnetic pole,
And the predetermined angle is 105 °. delete delete The method according to any one of claims 1, 2, 5, 6, and 7,
The field magnet has a ring shape in which a sintered magnet that magnetizes any one pole of one pole, two poles, three poles, or four poles is bonded or bonded to a case, respectively, and has a plurality of poles of which the magnetization direction is in the radial direction. Vibration motor, characterized in that formed as. The method according to any one of claims 1, 2, 5, 6, and 7,
The pivot is a vibration motor, characterized in that formed using tungsten or tungsten alloy. The method according to any one of claims 1, 2, 5, 6, and 7,
The rotating shaft is provided with a holder that is freely rotated,
The core and the substrate with a commutator are fixed to the holder, and the armature core is fixed by fitting the holder and the substrate with the commutator.
The rotating shaft is fixed to the case and the cover piped to the case.

Images