JP2002254029A - Dc brushless vibration motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a DC brushless vibration motor whose service life is prolonged by causing mechanic vibration by a revolution of eccentric rota, so as to prevent a mechanical abrasion of construction parts. SOLUTION: A stator has an upper magnetic pole piece 111, lower magnetic pole piece 112, and a stator field magnet coil. A ring space made by top and bottom magnetic poles pieces has a stator field magnetic coil in it. The center of gravity of inside rotor having a ring magnet 129 and eccentric weight 124 strains from a center axis of revolution. Eccentric weight is ring structure, and a ring magnet 129 is firmly fixed to outside surface of eccentric weight. A driving circuit 130 has a driving integrated circuit to control rotor revolution supplied by outside electric power. As when a stator makes rotor revolution, mechanical vibration occures, a casing firmly surrounds a stator and a rotor with spacing therebetween.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vibration motor, and more particularly, to a DC brushless vibration motor having a rotor having an eccentric weight.

[0002]

2. Description of the Related Art Mechanical vibrations are required for various uses. Examples of practical use are vibrations used industrially for material crushing and sorting, vibrations of household massage machines, portable telephone handsets and pagers. For example, there is only a small number of silent notifications of incoming calls and message reception.

Various methods can be used to generate mechanical vibration, for example, using an electric motor. At least two types of vibration generators are known as motors used to generate vibration. The first type is to attach an eccentric weight to the output shaft of a conventional motor that normally rotates smoothly without vibration. The vibration is caused by the eccentricity of the rotating part of the system due to the mounting of the eccentric weight on the output shaft of the motor. However, in this case, since the eccentric weight is attached to the outside of the motor housing, it may be necessary to add shielding means to prevent the rotating part of the system from adversely affecting the surroundings. Vibration with the second type of motor is caused by a rotor whose own center of gravity is eccentric. In this case, since the vibration is generated by the rotation of its own rotor, it is not necessary to attach an additional device to the rotor shaft of the motor.

Accordingly, the vibration motor of the present invention is a vibration generator of the type that generates mechanical vibration by rotation of its own rotor. Usually, the purpose of a conventional motor is to reduce vibration as much as possible, but the purpose of the vibration motor of the present invention is to intentionally generate mechanical vibration. Hereinafter, the description of the term “vibration motor” in the present specification means, specifically, a motor-type vibration device having a built-in eccentric rotor. A commutator-type DC motor having a left-right asymmetric rotor eccentric from the rotation axis of the rotor is disclosed in one U.S. Pat.
No. 348 ("flat two-phase vibration motor"). Wang discloses a flat two-phase commutator type DC motor using a rotor having a mechanically asymmetric structure. Since the center of gravity of the asymmetric rotor is displaced from the rotation center axis of the rotor, when the rotor of the vibration motor is driven, mechanical vibration occurs. However, one vibration motor requires the use of a pair of commutators / brushes to power the armature coils of its rotor.

In order to rectify the electric power required to operate one vibration motor, mechanical rubbing between the brush and the commutator is essential, and the rectifying segments and brushes of the commutator are worn by the mechanical rubbing. Inevitable. In addition, a short circuit between the continuous segments of the commutator due to accumulation of carbon caused by mechanical rubbing is inevitable. In addition, the intermittent conduction between the brush and the commutator segments emits electromagnetics that can interfere with surrounding electronic devices. If not properly shielded, excessive controllable EM interference can damage the motor control electronics circuitry and the like. Furthermore, as the brushes and commutators wear, this type of vibration motor has a short life. Further, the configuration of one two-phase vibration motor requires a more complicated power supply circuit because the two power supplies need to be phase-separated. Compared to a single-phase power supply, this type of commutator-type vibration motor has a higher overall cost and a complicated circuit.

[0006]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a mechanical vibration generated by the rotation of an eccentric rotor, and to prolong the service life by avoiding mechanical wear of components.
The object is to provide a DC brushless vibration motor.

Another object of the present invention is to provide a DC brushless vibration motor that generates mechanical vibration by rotation of an eccentric rotor and has almost no electromagnetic interference with the surrounding environment.

It is still another object of the present invention to provide a DC brushless vibration motor that operates with a simple single-phase power supply that generates mechanical vibration by rotation of an eccentric rotor and reduces the complexity of a motor drive circuit. It is.

It is still another object of the present invention to provide a DC brushless vibration motor which generates mechanical vibration by rotation of an eccentric rotor and is inexpensive to manufacture.

[0010]

SUMMARY OF THE INVENTION The present invention has achieved the above object by a DC brushless vibration motor having a stator, a rotor, a drive circuit, and a casing. The stator has an upper pole piece, a lower pole piece and a stator field winding, and the annular space formed by the upper and lower pole pieces has the stator field winding therein. The built-in rotor eccentric from the rotation center axis has an annular magnet and an eccentric weight. The eccentric weight has an annular structure, and the annular magnet is firmly fixed on the outer peripheral surface of the eccentric weight. The drive circuit has a drive integrated circuit for controlling rotation of the rotor by external power.
The casing surrounds the stator and the rotor in a state in which the stator and the rotor are firmly fixed while maintaining a gap between the stator and the rotor so that mechanical vibration is generated by the rotation of the stator by driving the rotor.

[0011]

FIG. 1 is an exploded perspective view showing the structure of a preferred embodiment of the present invention. Each feature is represented by showing all the components of the vibration motor separately.
FIG. 2 is a sectional view of the vibration motor of FIG. 1 completely assembled as a vibration motor, taken along an arbitrary cross section in the radial direction. Hereinafter, a preferred embodiment of the vibration motor of the present invention will be described in detail with reference to FIGS.

As shown in the embodiment of FIG. 1, the DC brushless vibration motor of the present invention has a rotor structure with a built-in magnet which rotates inside a stator having windings wound thereon. Since the function required of the vibration motor is to generate mechanical vibration, which is different from driving a typical external load, it is not necessary to have an external rotation output shaft extending from the motor body. Therefore, the structure with a built-in rotor is simpler than the structure of a motor having an external rotor.
Further, the stator of the vibration motor with a built-in rotor serves as a shield for the movable portion (vibration rotor) of the device, and can protect the movable portion from the environment around the motor.

As shown in the cross-sectional view of FIG. 2, the DC brushless vibration motor 100 of the present invention includes an external stator 110 and an internal rotor.
Has 120. The stator 110 and the rotor 120 are disposed at appropriate positions in the protective casing 190 of the motor while maintaining an appropriate air gap 140 between the opposing members. As is well known to those skilled in the art, the radial length of the air gap between the stator and rotor of the motor is preferably shorter. The actual size of the motor gap is determined by various manufacturing errors. In the embodiment shown in FIG. 1, the motor casing 190 has a substantially cylindrical cup 191 and an end plate 192. The stator and rotor assembly of the vibration motor is a cylindrical cup that effectively surrounds the stator and rotor.
It is firmly fixed in a recessed space consisting of 191 and end plate 192.

A DC brushless motor requires that an electronic drive circuit has a similar function as compared to a commutator motor that mechanically combines a brush and a commutator. As shown in FIGS. 1 and 2, in an embodiment of the vibration motor of the present invention, a driving circuit 130 based on an integrated circuit (IC) 132 soldered to a printed circuit board (PCB) 131 includes a stator 110 and a rotor 110. Along with 120, it is arranged inside the motor casing 190. Therefore, the rotor 120 of the vibration motor 100 supported by an appropriate bearing device 150 described below is driven inside the stator 110 under the control of the electronic drive circuit 130 to generate mechanical vibration.

As shown in the sectional view of FIG. 2, the stator 110 has a conductor coil having an arbitrary number of turns wound around the bobbin reel 113. The conductor wound on the bobbin reel 113 is provided in an annular space in which upper and lower magnetic pole pieces 111 and 112 are appropriately arranged, and forms an annular field winding 114 for the stator 110. The bobbin reel 113 can be made of, for example, a plastic material that functions as a multi-turn conductor support frame for the stator field windings 114.

The upper pole piece 111 and the lower pole piece 112
It has a number of radially inwardly facing pole plates 115 facing 140.
In the embodiment of FIG. 1 shown in perspective, the four pole plates 115 and 116 on the upper pole piece 111 and the lower pole piece 112, respectively, are arranged on a 360-degree circumference. Adjacent magnetic pole plates 115 or 116 are separated from each other by 90 degrees.
When the vibration motor 100 is assembled, the pole plates 115 and 116 on the upper pole piece 111 and the lower pole piece 112 are staggered to form an eight pole motor. As those skilled in the art are aware, the vibration motor of the present invention can be configured with various numbers of magnetic poles.

The upper and lower pole pieces 111 and 112 may be, for example, low carbon thin steel sheets. Pole pieces 111 and 112
Is assembled, an annular space for forming the stator field winding 114 therein is formed. As described above, the stator field winding 11
4 has a bobbin reel 113 for winding a multi-conductor coil. The conductor of the stator field winding 114 is applied by a passing current, and the pole pieces 111 and 112 constitute a magnetic flux path for a motor magnetic circuit. The pole pieces 111 and 112 of the present invention can be manufactured by low cost methods such as hydraulic pressing of metal plates.

The operating stator field winding 114 acts as an electromagnetic source that generates a magnetic flux by the applied excitation current. The generated magnetic flux flows longitudinally through the substantially cylindrical body of the stator 110 along the magnetic circuit inside the upper and lower pole pieces 111 and 112 at both ends of the cylindrical stator. That is, the magnetic flux is applied between the pole plates 115 and 116 of each pole piece 111 and 112 and the rotor 12.
Flow between 0 and.

Depending on the current excitation polarity of the stator field winding 114, magnetic flux flows radially through the air gap 140 to or from the corresponding magnetic pole of the annular magnet 129 of the rotor 120. When the magnetic flux passes through the closed loop of the magnetic circuit formed by the stator 110, the air gap 140, and the rotor 120, a mechanical driving force is exerted, the rotor 120 is driven to rotate, and vibration is generated. Depending on the relative angular position of the rotor 120, the drive circuit 130 supplies a drive current of either positive or negative polarity to the stator field winding 114. As a result, the pole plates 115 and 116 of the upper and lower pole pieces 111 and 112 are each applied as either an N pole or an S pole. By appropriate drive timing control, the stator 110 drives the rotor 120 to rotate in a desired rotation direction.

As is well known to those skilled in the art, during this time a special sensor provides information about the angular position of rotor 120 to drive circuit 130.
Give to. This information is necessary to control the timing and polarity of the drive current supply to the stator field winding 114. In the preferred embodiment, the PCB 131 of the drive circuit 130
Provides the drive IC 132 with the angular position information of the rotor 120.

It is preferable that a positioning hole 138 for receiving the stud bolt 119 projecting from the surface of the bobbin reel 113 is formed at an appropriate position on the PCB 131. The positioning joint of the hole 138 and the stud 119 allows the sensor to be set at a predetermined relative angular position on the PCB on which the sensor is mounted.

The pole plates 115 and 1 of the upper and lower pole pieces 111 and 112
Reference numerals 16 each have a surface configuration that is asymmetric with respect to the longitudinal center axis of the vibration motor. For example, in the perspective view of FIG.
One side edge in the direction of rotation 115 has a greater slope than the opposite side edge. This asymmetry provides the starting torque for the vibration motor. Non-asymmetric rotor 120
Each of the magnetic poles keeps a substantially balanced state, so that when the motor stops, it stops at the center position of the magnetic poles of the stator 110, so that no starting torque is generated even when the motor is restarted. When the motor is started from the stopped state, the magnetic pole is regenerated by the field winding 114 of the stator 110 through the corresponding magnetic pole plate.

The above-described stator structure of the vibration motor according to the present invention is suitable for single-phase operation. Single-phase DC brushless motors are advantageous in terms of circuit simplicity and electronic feedback, and in addition to their advantages and design efficiency, manufacturing costs are also relatively inexpensive. However, when a motor having a two-phase or three-phase structure is suitable for a specific application, the vibration motor of the present invention can be applied to a two-phase or three-phase structure by matching the configuration.

As described above, when assembling the vibration motor, the pole plates 115 and 116 of the upper and lower pole pieces 111 and 112 must maintain their relative angular positions. In the embodiment described in the present specification, as shown in FIGS. 1 and 2, at least one stud bolt 119 is protruded from both longitudinal end surfaces of the motor of the bobbin reel 113. The positioning holes 117 and 118 for receiving this are fitted with the corresponding upper and lower pole pieces.
It is preferably provided at 111 and 112. By properly arranging these positioning studs and holes, the correct relative angular positions of the upper and lower pole pieces 111 and 112 can be set. Further, the Hall sensor 134 of the drive circuit 130 can also be correctly disposed by the positioning studs 119 of the bobbin reel 113.

On the other hand, in order to maintain a sufficient gap between the continuous parts at both ends of the motor, it is preferable that the stud bolt 119 projecting from the bobbin reel 113 in the longitudinal direction of the vibration motor has an appropriate length. For example, PCB13 with drive circuit 130
1 in the motor casing 190, since the pole pieces are made of conductive laminated steel sheet, the PCB 131
A sufficient air gap must be provided between the upper pole piece 111 and the lower pole piece 112. If the air gap is not enough, a short circuit may occur. Since the vibration motor of the present invention is required to be downsized depending on the application, the above-mentioned gap must be minimized. This can be achieved by adjusting the length of the stud 119.

In the embodiment shown in FIGS. 1 and 2, the drive circuit 130 is mounted on a PCB, but the drive circuit may be mounted in another form. FIG. 7 is a perspective view showing an example in which the electronic drive circuit 130 is provided on the upper surface of the upper pole piece 111. Usually, since the pole piece 111 itself is conductive, an insulating film 135 is provided on the surface, and the drive electronic circuit 130 is disposed so as to be exposed on the uppermost surface. The current path is formed on the surface of the insulating layer 135,
Circuit components including the drive IC 132 and the Hall sensor 134 are mounted on the circuit. External power is supplied to the circuit through the power line 133.

As shown in the sectional view of FIG. 2, the rotor 120 has a mechanical structure that is asymmetric with respect to the rotation center axis 121.
With the asymmetric structure, the center of gravity of the entire rotor 120 is shifted from the rotation shaft 121. In the embodiment of FIG. 2, the rotor 120 of the vibration motor of the present invention has a shaft center along the center axis 121.
Supported by 122.

As is apparent from the perspective view of FIG. 1, the rotor 120 has a rotor frame 123 having a substantially cylindrical structure.
One end surface of the cylindrical body is depressed inward to form an annular concave space portion 125. As shown in the perspective view, the rotor frame 12
The 3 geometric structure can be formed, for example, by a low-cost metal plate press.

The annular rotor magnet 129 surrounds the outer peripheral surface of the cylindrical body of the rotor frame 123 while being firmly fixed. In the embodiment described herein, the annular rotor magnet 129 is magnetized by a total of eight alternating north and south poles. This is because the upper and lower pole pieces 111 and 112 each have four pole pieces, for a total of eight pole pieces.

On the other hand, an eccentric weight 124 is fitted into the annular concave space 125 formed by the rotor frame 123 and is firmly fixed. In an embodiment of the present invention, the eccentric weight 124 preferably has a structure that fits into the recess 125 in the rotor frame 123. It is preferable that the fitted weight 124 be firmly fixed in the space 125 using, for example, an adhesive.

In the center of the rotor frame 123, a bearing housing space 126 is further provided. The bearing device 150 can be housed in this space while being firmly fixed. The bearing device 150 plays a role of supporting the rotor 120 within the casing 190 of the vibration motor and rotatably supporting the rotor 120 about the axis 122. The structure of the rotor 120 in the preferred embodiment is a structure in which the bearing device 150 is installed on a shaft 122 fixed to a motor casing. However, as will be apparent to those skilled in the art, other forms of bearing support are within the scope of the invention and may be used as well. For example, the entire rotor 120 may be fixed to a shaft center supported at both ends by bearings installed in a casing 190 of the vibration motor 100.

The eccentric weight structure shown in FIGS. 1 and 2 is not the only eccentric way to generate mechanical vibration for the vibration motor of the present invention. 3 to 6 show still another four structures of the eccentric weight of the present invention. These all have the advantage of being simple and of low production cost. For example, a rotor 120A shown in the perspective view of FIG. 3 has an annular magnet 129, an eccentric weight 124A, and a rotor bearing 150. The structure of the annular magnet 129 and the bearing 150 is
It is substantially the same as the embodiment of FIGS. However, it differs in that the shape of the eccentric weight 124A is substantially partially annular. This eccentric weight 124A is partially annular,
It has a circumferential length close to the entire circumference of the complete ring. In other words, the eccentric weight 124A has a circumferential length of about two-thirds of the full 360 degree circumference. In other words, about one third of the ring
Is removed to form a space 127A. By removing about one third, the partial annular eccentric weight 124A can be easily fixed to the bearing device 150 by, for example, an adhesive. Since the eccentric weight 124A is clearly eccentric, mechanical vibration occurs when the rotor 120A is rotationally driven.

The rotor 120B of FIG. 4 has a different mass asymmetric structure from that of FIG. Although the eccentric weight 124B shown in FIG. 4 is also the basic structure of the annular body, a concave space portion 127B is formed by shaving an arbitrary portion on the outer peripheral surface of the annular body thickly and sufficiently deep in the radial direction. I have. The formation of the concave space portion 127B causes a bias in mass.

The rotor 120C of FIG. 5 shows another embodiment of the eccentric weight. Many holes 12 in the eccentric weight 124C of a substantially annular body
7C (four in the figure) are formed. That is, a hole 127C is provided in the eccentric weight 124C in a direction parallel to the rotation center axis. As will be apparent to those skilled in the art, these holes 127C may or may not be through holes. Regardless of the number and size of the holes, if the holes are arranged asymmetrically with respect to the center axis 12l of the vibration motor, the center of gravity of the weight 124C is shifted from the rotation axis.

FIG. 6 shows the structure of still another eccentric weight 124D applicable to the rotor 120D. As shown in the drawing, except that a part of one end surface in the longitudinal direction of the annular body is provided with an inclined surface 127D formed by a perpendicular to the rotor rotation center axis,
124D is almost cyclic. The center of gravity of the rotor 120D is shifted from the rotation center axis by the whole or partly elliptical contour obtained by providing the inclined surface as illustrated.

Therefore, in any case where the structure of the embodiment of FIGS. 3-6 or a similar structure not described herein is applied to the rotor, a gap 140 is provided between the stator of the vibration motor and the rotor. Must be provided. In other words, the upper magnetic pole piece 111 of the stator 110 used in the vibration motor 100 of the present invention, which faces the outer peripheral surface of the annular magnet 129 of the rotor 120.
A gap 140 must be provided between the lower pole piece 112 and the surface of the pole plates 115 and 116.

Power line 1 communicating with drive circuit 130 on PCB 131
33 supplies power to the drive circuit 130 from an external power supply. Under the control of the drive IC 132 by feedback from a sensor such as the Hall sensor 134, the external power supply supplies an appropriate amount of current to the stator field winding 114, and as a result, the rotor 120 is driven to rotate. Due to the eccentric characteristic of the rotor 120, when the vibration motor is driven, mechanical vibration occurs.

According to the disclosure of the present invention, when the vibration motor of the present invention for generating mechanical vibration is reduced in size, it can be used for mobile devices such as a mobile phone handset and a pager. Mechanical vibration is suitable for silent notification of incoming calls and / or messages. On the other hand, an enlarged version of the vibration motor of the present invention is suitable for applications such as massage machines. The present invention covers all applications using mechanical vibration.

While the specific embodiments have been described in detail, they can be modified in various ways, and other structures and alternatives can be applied. For example, in the embodiment of the present invention, the PCB is mounted in the casing of the vibration motor as a drive circuit, but may be mounted outside if miniaturization of the motor is required. Further, the Hall sensor used as the rotor angle position observing means can be replaced by another means such as an optical sensor. Further, the stator and the rotor of the vibration motor of the present invention each have the same number of magnetic poles, but it is within the scope of the present invention that the total number of magnetic poles is different. Further, the casing for the vibration motor according to the embodiment of the present invention is constituted by a cylindrical cup and an end plate. For example, two simple ends fixed to each of upper and lower magnetic pole pieces capable of supporting a bearing device for rotating the rotor. It may have a plate structure. Obviously, when a casing for a vibration motor having this structure is used, for example, the upper and lower magnetic pole pieces are firmly surrounded by the inner peripheral surface of one magnetic pole piece firmly surrounding the corresponding outer peripheral surface of the other magnetic pole piece. It is necessary to fix. As described above, the present specification and the drawings do not limit the scope of the present invention described in the claims.

[Brief description of the drawings]

The features and advantages of the present invention will be apparent from the description, the claims, and the accompanying drawings of the present specification.

FIG. 1 is an exploded perspective view of a DC brushless vibration motor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the vibration motor of FIG. 1 along one radial cross section.

FIG. 3 is a perspective view showing a preferred embodiment of the structure of the eccentric rotor for the DC brushless vibration motor of the present invention.

FIG. 4 is a perspective view showing another preferred embodiment of the structure of the eccentric rotor for the DC brushless vibration motor of the present invention.

FIG. 5 is a perspective view showing still another preferred embodiment of the structure of the eccentric rotor for the DC brushless vibration motor of the present invention.

FIG. 6 is a perspective view showing still another preferred embodiment of the structure of the eccentric rotor for the DC brushless vibration motor of the present invention.

FIG. 7 is a perspective view showing the arrangement of an electronic drive circuit on the upper pole piece surface.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 29/08 H02K 29/08 (72) Inventor Chin Shen Horn Taiwan 120 -3 (72) Inventor Zhu Quo Inn Nyaosung Sui Guan Road, Gao Shan Province, Taiwan 2-36-F F-term (reference) BB14 CC01 DD02 DD16 EE58 FF12 GG01 HH01 HH09 JJ04 5H615 AA01 BB01 BB04 BB07 BB14 PP01 PP02 SS18 SS20 TT05 5H621 BB07 GA07 GB10 HH01 JK01 JK07 JK14

Claims (52)

[Claims] 1. A stator having a field winding, a rotor disposed inside the stator substantially coaxially with the stator, having a rotor magnet built therein, and eccentric from a rotation center axis; A drive circuit for controlling a drive current supplied to the field winding for electromagnetically inducing rotation, and a casing for accommodating the stator and the rotor in a firmly fixed state while providing a gap therebetween. A DC brushless vibration motor. 2. The vibration motor according to claim 1, wherein
The stator is characterized in that an upper magnetic pole piece and a lower magnetic pole piece are disposed substantially coaxially to form an annular space, and a field winding of the stator is provided in the annular space.
DC brushless vibration motor. 3. The vibration motor according to claim 1, wherein
The rotor has an annular magnet and an eccentric weight, the annular magnet being substantially coaxial with the rotor, the eccentric weight being a partial annular body having a circumferential length near the entire circumference of the complete ring; A vibration motor, wherein the annular magnet is firmly fixed to an outer peripheral surface of the eccentric weight. 4. The vibration motor according to claim 3,
A vibration motor, wherein the circumferential length of the partial annular body is approximately two thirds of the entire circumference of the complete ring. 5. The vibration motor according to claim 1, wherein
The rotor has a rotor frame, an annular magnet, and an eccentric weight. The rotor frame and the annular magnet are substantially coaxial with the rotor, and the rotor frame has an annular concave shape for firmly fitting the eccentric weight. It has a space,
The vibration motor according to claim 1, wherein the annular magnet is firmly fixed to an outer peripheral surface of the rotor frame. 6. The vibration motor according to claim 1, wherein
The rotor has an annular magnet and an eccentric weight, and the annular magnet is substantially coaxial with the rotor, and the eccentric weight has a thick and sufficiently deep cut to form a concave space at any point on the outer peripheral surface. A basic structure of an annular body provided in the radial direction, wherein the annular magnet is firmly fixed to the outer peripheral surface of the eccentric weight. 7. The vibration motor according to claim 1, wherein
The rotor has an annular magnet and an eccentric weight, the annular magnet being substantially coaxial with the rotor, the eccentric weight providing at least one hole asymmetrically with respect to the axis parallel to a central axis of rotor rotation. A vibration motor having a basic structure of an annular body, wherein the annular magnet is firmly fixed to an outer peripheral surface of the eccentric weight. 8. The vibration motor according to claim 7, wherein
The vibration motor according to claim 1, wherein the at least one hole is a through hole. 9. The vibration motor according to claim 7, wherein
The at least one hole is not a through hole. 10. The vibration motor according to claim 1,
The rotor has an annular magnet and an eccentric weight, the annular magnet is substantially coaxial with the rotor, and the eccentric weight has all or one of the elliptical contours by partially providing an inclined surface on one end surface in the longitudinal direction. A vibration motor having a basic structure of an annular body showing a portion, wherein the annular magnet is firmly fixed to an outer peripheral surface of the eccentric weight. 11. The vibration motor according to claim 1,
A vibration motor, wherein the drive circuit includes a drive integrated circuit mounted on a printed circuit board for controlling rotation of the rotor by external power. 12. The vibration motor according to claim 11,
The vibration motor is characterized in that the drive circuit is mounted in the casing. 13. The vibration motor according to claim 11,
A vibration motor, wherein the drive circuit is mounted outside the casing. 14. The vibration motor according to claim 1,
A vibration motor, wherein the drive circuit has an integrated circuit mounted on a surface of the stator. 15. A stator having an upper pole piece, a lower pole piece and a stator field winding, wherein the upper and lower pole pieces are respectively disposed substantially coaxially to form an annular space,
A stator in which the stator field winding is provided in the annular space, and a rotor eccentric from a rotation center axis, having an annular magnet and an eccentric weight, wherein the annular magnet is substantially coaxial with the rotor. The eccentric weight has an annular structure, the annular magnet is firmly fixed to the outer peripheral surface of the eccentric weight, and the field winding of a drive current for electromagnetically inducing the rotation of the rotor. A DC brushless vibration motor, comprising: a drive circuit for controlling feeding to the housing; and a casing for accommodating the stator and the rotor in a state in which the stator and the rotor are firmly fixed while providing a gap therebetween. 16. The vibration motor according to claim 15,
The eccentric weight is a partial annular body having a circumferential length close to the entire circumference of a complete ring, and the annular magnet is firmly fixed to an outer peripheral surface of the eccentric weight. 17. The vibration motor according to claim 16,
A vibration motor, wherein the circumferential length of the partial annular body is approximately two thirds of the entire circumference of the complete ring. 18. The vibration motor according to claim 15,
The rotor further has a rotor frame substantially coaxial with the rotor, the rotor frame has an annular concave space portion for firmly fitting the eccentric weight, and the annular magnet is provided on an outer periphery of the rotor frame. A vibration motor, which is firmly fixed to a surface. 19. The vibration motor according to claim 18,
The vibration motor according to claim 1, wherein the rotor frame is substantially a cylindrical body, and the annular concave space portion is formed by a concave portion provided at one longitudinal end surface of the cylindrical body. 20. The vibration motor according to claim 19,
The vibration motor according to claim 1, wherein the eccentric weight has a shape and a size suitable for being assembled in an annular concave space of the rotor frame. 21. The vibration motor according to claim 15,
The eccentric weight has a basic structure of an annular body provided with a thick and sufficiently deep cut in a radial direction to form a concave space portion at an arbitrary position on an outer peripheral surface, and the annular magnet has an outer peripheral surface of the eccentric weight. A vibration motor, which is firmly fixed to the motor. 22. The vibration motor according to claim 15,
The eccentric weight has a basic structure of an annular body provided with at least one hole, the at least one hole is provided asymmetrically with respect to the axis and parallel to a central axis of rotor rotation, and the annular magnet is A vibration motor, which is firmly fixed to an outer peripheral surface of the eccentric weight. 23. The vibration motor according to claim 22,
The vibration motor according to claim 1, wherein the at least one hole is a through hole. 24. The vibration motor according to claim 22,
The at least one hole is not a through hole. 25. The vibration motor according to claim 15,
The eccentric weight has a basic structure of an annular body that partially or entirely has an elliptical contour by partially providing an inclined surface at one end surface in the longitudinal direction, and the annular magnet is firmly attached to the outer peripheral surface of the eccentric weight. A vibration motor, which is fixed. 26. The vibration motor according to claim 15,
A vibration motor, comprising: a driving integrated circuit mounted on a printed circuit board for controlling rotation of the rotor by supplying external power. 27. The vibration motor according to claim 26,
The vibration motor is characterized in that the drive circuit is mounted in the casing. 28. The vibration motor according to claim 26,
A vibration motor, wherein the drive circuit is mounted outside the casing. 29. The vibration motor according to claim 15,
A vibration motor, wherein the drive circuit has an integrated circuit mounted on a surface of the stator. 30. The vibration motor according to claim 15,
The upper magnetic pole piece and the lower magnetic pole piece of the stator each have the same number of magnetic pole plates that radially oppose the air gap of the inner peripheral portion of the stator, and the plural magnetic pole plates of the upper magnetic pole piece. The vibration motor according to claim 1, wherein the plurality of magnetic pole plates of the lower magnetic pole piece are arranged alternately. 31. The vibration motor according to claim 15,
The said stator further has a several conductor coil wound around a bobbin reel, The vibration motor characterized by the above-mentioned. 32. The vibration motor according to claim 15,
The casing has a cylindrical cup and an end plate, and the cylindrical cup and the end plate form a protective closed space for enclosing the stator and the rotor in a firmly fixed state. Vibration motor. 33. The vibration motor according to claim 32,
A vibration motor, wherein the casing further has a bearing device for supporting the rotor. 34. The vibration motor according to claim 33,
The bearing device has a cylindrical shaft core having one end firmly fixed to the cylindrical cup and the other end firmly to the end plate, and a peripheral surface of the shaft core carries a bearing for rotatably supporting the rotor. A vibration motor characterized by being suitable for mounting. 35. The vibration motor according to claim 33,
The bearing device has the cylindrical shaft center having one end pivotally supported by the cylindrical cup by a first bearing and the other end pivotally supported by the end plate by a second bearing. A vibration motor fixed to the rotor to rotatably support the rotor. 36. The vibration motor according to claim 15,
The vibration motor is characterized in that the drive circuit is mounted in the casing. 37. The vibration motor according to claim 15,
A vibration motor, wherein the drive circuit is mounted outside the casing. 38. The vibration motor according to claim 31,
The bobbin reel has at least one positioning stud bolt protruding in the longitudinal direction on both side surfaces thereof, and the upper and lower pole pieces have at least one positioning hole on each corresponding surface, and the at least one positioning stud is provided. A vibration motor, wherein the bobbin reel is sandwiched between a lower pole piece and an upper pole piece by adjusting a relative position of a positioning hole corresponding to a bolt. 39. The vibration motor according to claim 38,
The drive circuit has a printed circuit board on which a rotor angular position sensor is mounted, and the printed circuit board has at least one positioning hole connected to the at least one positioning stud provided on the bobbin reel; And a stud connected to the stud to determine a relative angular position of the sensor on the printed circuit board. 40. The vibration motor according to claim 39,
The vibration motor according to claim 1, wherein the rotor angular position sensor is a hall sensor. 41. A stator having an upper pole piece, a lower pole piece, and a stator field winding, wherein the upper and lower pole pieces are disposed substantially coaxially with each other to form an annular space. A plurality of pole plates of the same number of pole pieces are alternately opposed in the radial direction inside the stator, and the annular space has the stator field winding therein, and a plurality of conductor coils wound around a bobbin reel. And a rotor eccentric from the rotation center axis,
An annular magnet and an eccentric weight, wherein the annular magnet is substantially coaxial with the rotor, the eccentric weight has the shape of a partial annular body, and the partial annular body has a circumference close to the entire circumference of the complete ring. The annular magnet has a length in the direction, and the annular magnet controls a rotor firmly fixed to an outer peripheral surface of the eccentric weight and a drive current for electromagnetically inducing the rotation of the rotor to be supplied to the field winding. A drive circuit having a drive integrated circuit, a cylindrical cup and an end plate for accommodating the stator and the rotor in a firmly fixed state, and further providing the rotor while providing a gap between the stator and the rotor. A DC brushless vibration motor, comprising: a casing having a bearing device that supports the shaft. 42. A stator having an upper pole piece, a lower pole piece, and a stator field winding, wherein the upper and lower pole pieces are disposed substantially coaxially with each other to form an annular space. A plurality of pole plates of the same number of pole pieces are alternately opposed in the radial direction inside the stator, and the annular space has the stator field winding therein, and a plurality of conductor coils wound around a bobbin reel. And a rotor eccentric from the rotation center axis,
A rotor frame, an annular magnet and an eccentric weight, wherein the rotor frame and the annular magnet are substantially coaxial with the rotor, and a recess for firmly fitting the eccentric weight to one longitudinal end surface of the rotor frame; A rotor having an annular recessed space made of a magnetic material, wherein the annular magnet is firmly fixed to the outer peripheral surface of the rotor frame, and a drive current for electromagnetically inducing the rotation of the rotor is transmitted to the field winding. A drive circuit having a drive integrated circuit for controlling feeding, a cylindrical cup and an end plate for accommodating the stator and the rotor in a firmly fixed state, and further providing a gap between the stator and the rotor. And a casing having a bearing device that supports the rotor while supporting the rotor. 43. A stator having an upper pole piece, a lower pole piece, and a stator field winding, wherein the upper and lower pole pieces are disposed substantially coaxially with each other to form an annular space. The same number of pole plates of the pole pieces are alternately opposed in the radial direction inside the stator, and the annular space has the stator field winding therein and a plurality of conductor coils wound on a bobbin reel. A stator and a rotor eccentric from the center axis of rotation, having an annular magnet and an eccentric weight, wherein the annular magnet is substantially coaxial with the rotor, and the eccentric weight is recessed at an arbitrary position on an outer peripheral surface. A rotor having a basic structure of an annular body provided with a thick and sufficiently deep cut in the radial direction to form a cylindrical space, wherein the annular magnet is firmly fixed to the outer peripheral surface of the eccentric weight, and A drive current for electromagnetically inducing rotation is applied to the field winding. A drive circuit having a drive integrated circuit for controlling feeding, a cylindrical cup and an end plate for accommodating the stator and the rotor in a firmly fixed state, and further providing a gap between the stator and the rotor. And a casing having a bearing device that supports the rotor while supporting the rotor. 44. A stator having an upper pole piece, a lower pole piece, and a stator field winding, wherein the upper and lower pole pieces are disposed substantially coaxially with each other to form an annular space. The same number of pole plates of the pole pieces are alternately opposed in the radial direction inside the stator, and the annular space has the stator field winding therein and has a plurality of conductor coils wound on a bobbin reel. A stator and a rotor eccentric from a rotation center axis, the annular body having an annular magnet and an eccentric weight, the annular magnet being substantially coaxial with the rotor, and the eccentric weight having at least one hole. The at least one hole is provided asymmetrically with respect to the axis in parallel with the central axis of the rotor rotation, and the annular magnet is firmly fixed to the outer peripheral surface of the eccentric weight, and is fixed. A rotor rotatably driven by a child, and the rotor A drive circuit having a drive integrated circuit for controlling supply of a drive current for electromagnetically inducing rotation to the field winding; a cylindrical cup and an end for accommodating the stator and the rotor in a firmly fixed state; A DC brushless vibration motor, comprising: a plate; and a casing having a bearing device that supports the rotor while providing a gap between the stator and the rotor. 45. A stator having an upper pole piece, a lower pole piece, and a stator field winding, wherein the upper and lower pole pieces are disposed substantially coaxially with each other to form an annular space. The same number of pole plates of the pole pieces are alternately opposed in the radial direction inside the stator, and the annular space has the stator field winding therein and a plurality of conductor coils wound on a bobbin reel. A stator and a rotor eccentric from a center axis of rotation, comprising an annular magnet and an eccentric weight, wherein the annular magnet is substantially coaxial with the rotor, and the eccentric weight is partially inclined to one end surface in a longitudinal direction. A rotor having a basic structure of an annular body having an entire surface or an elliptical outline by providing a surface, wherein the annular magnet is firmly fixed to the outer peripheral surface of the eccentric weight; Controls the supply of induced drive current to the field winding A drive circuit having a drive integrated circuit, and a cylindrical cup and an end plate for accommodating the stator and the rotor in a firmly fixed state, and further providing the rotor with a gap between the stator and the rotor. And a casing having a bearing device for supporting the brushless DC motor. 46. The vibration motor according to claim 41, wherein the bearing device has one end in a cylindrical cup,
Vibration characterized by having a cylindrical shaft core the other end of which is firmly fixed to an end plate, and a peripheral surface of the shaft center being suitable for mounting a bearing for rotatably supporting the rotor. motor. 47. The vibration motor according to claim 41, wherein the bearing device includes one end pivotally supported by the cylindrical cup by a first bearing and the end plate by a second bearing. A vibration motor having the cylindrical shaft center having the other end supported by the shaft, the shaft center being fixed to the rotor to rotatably support the rotor. 48. The vibration motor according to claim 41, wherein the drive circuit is mounted in a casing. 49. The vibration motor according to claim 41, wherein the drive circuit is mounted outside a casing. 50. The vibration motor according to claim 41, wherein at least one positioning stud is protruded from a surface at both ends in a longitudinal direction of the bobbin reel, and at least one positioning hole is provided. The at least one positioning stud, which is formed on each corresponding surface of the upper and lower pole pieces and is connected to a corresponding positioning hole, is disposed between the lower pole piece and the upper pole piece. And a vibration motor. 51. The vibration motor according to claim 41, wherein the drive circuit has a printed circuit board on which a rotor angle position sensor is mounted, and the printed circuit board is the at least one of the bobbin reels. Having at least one locating hole for coupling with two locating studs, said hole coupling with said stud to determine the relative angular position of said sensor on said printed circuit board;
At least one positioning stud protrudes from both end surfaces in the longitudinal direction of the bobbin reel, and at least one positioning hole is formed on each corresponding surface of the upper and lower pole pieces, and the at least one positioning bolt is formed. A vibration motor, which is disposed so as to be sandwiched between the lower magnetic pole piece and the upper magnetic pole piece by a relative arrangement of studs and corresponding positioning holes. 52. The vibration motor according to claim 41, wherein the driving circuit has a printed circuit board on which a rotor angle position sensor is mounted, and the printed circuit board is the at least one of the bobbin reels. Having at least one locating hole for coupling with two locating studs, said hole coupling with said stud to determine the relative angular position of said sensor on said printed circuit board;
At least one positioning stud protrudes from both end surfaces in the longitudinal direction of the bobbin reel, and at least one positioning hole is formed on each corresponding surface of the upper and lower pole pieces, and the at least one positioning bolt is formed. A vibration motor which is disposed so as to be sandwiched between the lower magnetic pole piece and the upper magnetic pole piece by a relative arrangement of studs and corresponding positioning holes, and wherein the angular position sensor is a Hall sensor.