JP3706016B2 - Flat small brushless vibration motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flat small brushless vibration motor suitable for use as a silence notification means of a mobile communication device.
[0002]
[Prior art]
Conventionally, the present applicant has previously proposed Japanese Utility Model Laid-Open No. 4-137463 (Utility Model Registration No. 2549357), Japanese Patent Laid-Open No. 10-248203, and the like as flat small brushless vibration motors.
Further, as a similar one, as shown in Japanese Patent Application Laid-Open No. 11-98761, a rotor case whose side surface is folded and eccentric is proposed.
However, in such a configuration, since the material of a normal rotor case is steel having a specific gravity of about 7.9, the amount of eccentricity is small and not practical.
For this reason, a shallow cylindrical magnet is arranged inside a rotor case constituting a magnetic circuit as a small brushless vibration motor, and an eccentric weight made of a semi-cylindrical tungsten alloy is arranged outside, for example, Japanese Patent Laid-Open No. 2000-166173. There is something as shown in FIG.
[0003]
[Problems to be solved by the invention]
In such a structure, since the eccentric weight portion has to protrude from the turning outer diameter of the rotor case, this risk is avoided and a cover is attached so as to facilitate handling. Therefore, there is a dislike that the size becomes large in the radial direction. In other words, the larger the eccentric weight in order to increase the amount of vibration, the more sacrificing the radial size.
As a countermeasure, it is necessary to prevent the eccentric weight from protruding from the turning outer diameter of the rotor case.
[0004]
Accordingly, an object of the present invention is to provide a flat, small brushless vibration motor in which the size is not sacrificed and the amount of vibration is not sacrificed by fixing the magnet to the magnet using the substantially thick portion of the rotor case. It is what.
[0005]
[Means for Solving the Problems]
To solve the above problems, the co the rotor case as shown in claim 1 (57) has a central portion the shaft (2) is supported (57a), a plurality of bridging portions from the center portion A plurality of through holes (57c) are formed leaving (57b), and a flat axial gap type magnet (68) is fixed to the bridging portion (57b) from the inner ceiling, and is made of a tungsten alloy eccentric. wait at least with a portion is fixed to a portion of the through hole through the eccentric weight mounted guide provided in the rotor casing, through the central portion through hole in at least the opposite side of the (W3) (57c) is provided, and the axial air-gap type eccentric rotor magnet is positioned so as to face the inside of the eccentric weight, shaft support for rotatably supporting the eccentric rotor (11a) are integrated, the shaft support One around A resin-made stator base (11) provided in the body , and at least one armature coil of a plurality of air-core armature coils (33a, 33b,. magnet There in those receiving the air-core armature coil arranged to be removed, at least positive and negative two terminals disposed on a side of said stator base, the magnetic force of the axial gap-type magnet of the eccentric rotor and diaphyseal having a plurality pieces Do Ri from the predetermined shape to form a magnetic material in order to control the suction force by a magnetic force (11h), the position of the air-core armature coils the deletion in the resin stator base of the upper surface And a cover attached to a side portion of the stator so as to cover the eccentric rotor .
Also, the rotor case (57) as shown in claim 2 and having a central portion axis (2) is supported (57a), leaving a plurality of bridge (57 b) to the least ceiling A plurality of through holes (57c) are formed by closing the bridging portion at the outer peripheral portion, and an eccentric weight (W3) made of tungsten alloy having a portion having the same shape as the through hole in a part of the through holes. An eccentric rotor in which an axial gap magnet (68) is bonded to the ceiling surface facing the bridging portion and the eccentric weight while the opposite side remains a through hole through the central portion, and the eccentric rotor And a resin stator base ( 11) integrally provided around the shaft support, and a plurality of parts that are equally positioned on the top surface of the stator base. Less than one air core armature coil And air-core armature coil arranged to also delete one armature coil component, and at least positive and negative two terminals disposed laterally, the magnetic force of the axial gap-type magnet of the eccentric rotor A skeleton (11h) made of a magnetic material that is received and formed in a predetermined shape to control the attracting force due to the magnetic force of the magnet, and the deleted air-core armature coil on the top surface of the resin stator base It can also be achieved by including an installed drive circuit member and a cover attached to a side portion of the stator so as to cover the eccentric rotor.
[0006]
According to the first aspect of the present invention, it is possible to achieve both a reduction in weight and a centrifugal force while being small in size, and even in an axial gap type coreless slotless type, the amount of magnetic adsorption can be controlled by the diaphysis. By selecting this, reflow soldering can be performed due to its heat insulation, and the eccentric rotor is protected by this cover, so that it is convenient to handle.
The eccentric rotor according to the second aspect of the present invention can be configured as a thin and small axial gap type vibration motor because no consideration is given to the installation space for the eccentric weight. Since the amount of adsorption can be controlled, it can be a motor with less loss, and by selecting a cover material, reflow soldering can be performed due to its heat insulation, and this cover protects the eccentric rotor, so it is convenient to handle .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows the first embodiment of the present invention, and is a plan view of the inside of a small brushless vibration motor of a radial gap type cored system.
FIG. 2 is a longitudinal sectional view of the motor of FIG.
FIG. 3 is a plan view of the inside of a modification of the motor of FIG.
FIG. 4 shows a second embodiment of the present invention and is a longitudinal sectional view of a small brushless vibration motor of an axial air gap type cored system.
FIG. 5 is a plan view of the inside of the motor of FIG.
FIG. 6 shows a third embodiment of the present invention, and is a longitudinal sectional view of a small brushless vibration motor of an axial gap type coreless system.
FIG. 7 is a plan view of the inside of the motor of FIG.
[0008]
Hereinafter, the configuration of the present invention will be described based on each embodiment shown in the drawings.
1 and FIG. 2 are three-phase, radially-voided, cored, flat, small brushless vibration motors, that is, made of heat-resistant resin that is outsert-molded on a skeleton 1h that constitutes a part of the housing H. Further, the shaft support portion 1a is erected from the skeleton 1h at the center of the rectangular stator base 1 as viewed from a plane constituting a part of the housing, and is fixed by press-fitting the shaft 2 into the shaft support portion 1a. Three-phase six poles are provided by attaching a stator core 4 in which armature coils 3a, 3b,..., 3f are wound around salient poles 4a, 4b,. The stator S is composed of Although not shown in detail in the figure, a part of the skeleton 1h forms a terminal part 1t independently of each other except for the common terminal 1k, and the bulge portion around which the armature coils 3a, 3b,. A recess 1n is provided to allow escape.
The armature coils are usually formed by connecting opposing armature coils in series, and their terminals are connected to the exposed portions 1u integrated with the terminal portions 1t.
On the other hand, the rotor R is composed of a shallow cylindrical rotor case 5 provided with a bearing 5a at the center and a shallow cylindrical magnet 6 fixed to the inside thereof. Further, a first notch 5b and a side surface of the rotor case 5 are provided. Eccentric weight attachment guide portions 5bb are provided at both ends, and a second cutout portion 5c is provided as a weight reducing means on the opposite side surface of the first cutout portion 5b through the bearing 5a. In order to further reduce the weight, a substantially half-moon shaped third cutout portion 5d is formed on the ceiling opposite to the first cutout portion 5b.
The semi-cylindrical eccentric weight W, which is the feature of the present application, is fitted into the first cutout portion 5b and fixed at the ceiling portion, and is attached to the outer periphery of the shallow cylindrical magnet 6 by direct bonding or the like. It is.
The eccentric rotor R configured as described above is rotatably mounted on the shaft 2 via the bearing 5a disposed at the center. The eccentric rotor R is attracted to the stator side by the center of the shallow cylindrical magnet 6 and the center of the stator core 4 being shifted in the axial direction, and is rotatably received by two thin thrust washers sw.
Here, the eccentric weight W is a copper tungsten alloy having a density (specific gravity) of about 17.
Here, the cylindrical magnet 6 has eight magnetic poles magnetized NS alternately in the circumferential direction so as to obtain good activation.
In addition, since the eccentric rotor R is exposed, if it is inconvenient to mount on the equipment, as shown by an imaginary line, the cover C made of non-magnetic stainless steel having a thin heat insulating effect constituting a part of the housing is used. The eccentric rotor R may be covered.
The cover C may be attached to the rectangular stator base 1 by bending the skirt portion Ca and insulated from the terminal portions 1t.
In this way, even if there is a leakage flux of the magnet to some extent, there is no risk of disturbing the rotation of the rotor, and heat insulation to the magnet can be achieved even in reflow soldering. Further, each terminal portion is arranged at a corner of the square, and consideration is given so that it does not protrude outward from the outer diameter of the square.
As a drive system having such a configuration, a sensorless system using a three-phase unipolar or bipolar is used. Since the driving principle is known, the description thereof is omitted.
[0009]
Hereinafter, although the modification of said embodiment and other embodiment are described, about the same member or the substantially identical member which has the same function, the same code | symbol may be attached | subjected and the description may be abbreviate | omitted.
FIG. 3 shows a biting portion having an opening angle (90 degrees in this case) that does not cause a problem in starting part of the resin-made shallow cylindrical magnet 66 as the eccentric rotor R1 in the first modified example. And an eccentric weight W1 made of a polyamide resin made of a tungsten alloy containing iron powder and having a density (specific gravity) of about 13 is integrally formed with the shallow cylindrical magnet 66 made of resin. It is attached by. Also here, the side surface of the rotor case 55 is cut out on the opposite side of the eccentric weight W1 so as to have a biting portion 55e, and a part of the shallow cylindrical magnet 66 made of resin bites into this side. That is, it is integrally formed including the rotor case 55.
In the figure, 55f is a through hole provided in the ceiling portion of the rotor case 55 to connect the eccentric weight W1 and the rotor case 55, and functions as an attaching guide portion for the eccentric weight. As a result, the eccentric weight W1 is held by the rotor case 55.
[0010]
4 and 5 are employed in an axial gap type cored flat, small brushless vibration motor according to the second embodiment of the present invention. That is, the eccentric rotor R2 is formed at the center. An arcuate hole 55g for mounting is provided in the corner of the ceiling portion of the rotor case 55 to which the shaft 2 is fixed, and an eccentric weight W2 is fitted into the arcuate hole 55g for attachment to the ring-shaped axial gap magnet 67 directly. Glued. This axial gap type magnet 67 is made to face a blade portion of a salient pole, which will be described later, via a gap, and the rotor case 55 on the opposite side of the eccentric weight W2 has a plane as a weight reducing means. In this case, an arc-shaped first cutout portion 55c and a substantially half-moon-shaped second cutout portion 55d are provided.
On the other hand, the stator S2 for driving the eccentric rotor R2 is made of polyphenylene containing barium titanate whisker having good heat resistance and slidability which is outsert-molded on a diaphysis 11h cut out from a lead frame made of a thin tinned steel plate (tinplate). A shaft support portion 11a that also serves as a bearing in the center of a rectangular stator base 11 made of sulfide resin is raised from the skeleton 11h with a reinforcing tongue 11r included therein, and there are six three-phases around the shaft support portion 11a. A core 44 having the same number of salient poles 44a, 44b,..., 44f around which armature coils 3a, 3b,. In this core 44, the blades a, b,..., F of each salient pole are slightly wide in the radial direction. A part of the diaphysis 11h forms a terminal portion 1t independently of each other except the common terminal 1k. Here, the ring-shaped axial gap type magnet 67 constituting the eccentric rotor R2 is arranged facing the blade portion using the winding thickness of the armature coils 3a, 3b,..., 3f. Since the arrangement space can be ignored, there is no possibility that the attitude of the motor becomes high. Therefore, the eccentric weight W2 that faces the blades a, b,..., F through the radial gap comes to the position of the radial gap magnet in the case of FIG. Centrifugal force is obtained.
In the figure, B is a ball that receives the base end of the shaft in order to reduce brake loss during rotation due to the axial attractive force of the eccentric rotor R2, and 11s is a reinforcing member that leaves a part of the diaphysis 11a. It is a bridge piece.
[0011]
FIG. 6 and FIG. 7 show a small brushless vibration motor of an axial gap type coreless system as a third embodiment of the present invention. The eccentric rotor R3 has a shaft 22 fixed to a central portion 57a and the center. A plurality of through-holes 57c are provided from the portion 57a, leaving a bridging portion 57b, and a rotor case 57 in which a flat axial gap magnet 68 is fixed inside, and a copper having a specific gravity of 17 in a part of the through-hole 57c. A flat eccentric weight W3 made of a tungsten alloy is bonded. In this case, since the flat eccentric weight W3 has a relatively large size, the flat eccentric weight W3 can be made thin enough to be accommodated in the thickness of the flat rotor case 57, and there is no possibility that the posture is increased even with the eccentric weight W3. .
The stator S3 for driving the eccentric rotor R3 is heat-resistant and slidable outsert-molded on a diaphysis 11h cut out from a lead frame made of a thin tinned steel plate (tinplate) as in the case of FIG. A shaft support portion 11a that also serves as a bearing at the center of a rectangular stator base 11 made of polyphenylene sulfide resin containing good barium titanate whisker is raised from the skeleton 11h with a reinforcing tongue 11r included therein, and the shaft support portion 11a Three-phase six air-core armature coils 33a, 33b,..., 33f are disposed around the stator S3. A recess 11n is provided below these air-core armature coils 33a, 33b,..., 33f to lead out the coil terminals so that they are not crushed and disconnected.
A part of the diaphysis 11h forms a terminal portion 11t independently of each other except for the common terminal 1k, and the diaphysis 11h is set in a predetermined shape so as to control the attraction force by the magnetic force of the axial gap magnet. Is done.
Each armature coil is normally formed by connecting opposing armature coils in series, and the terminal is connected to each terminal 1t via a recess 11n.
As shown in FIG. 6, this stator may be composed of three-phase six air-core armature coils, but at least one air-core armature coil is deleted and a drive circuit member is stored in a vacant portion. You may make it.
In this way, only two positive and negative power supply terminals are required.
[0012]
The present invention can take various other embodiments without departing from the technical idea and characteristics thereof. Therefore, the above-described embodiment is merely an example and should not be interpreted in a limited manner. The technical scope of the present invention is indicated by the claims, and is not restricted by the text of the specification.
[0013]
【The invention's effect】
Since the present invention is configured as described above, a flat small brushless vibration motor that does not sacrifice the size and the amount of vibration by fixing the magnet to the magnet using the substantially thick portion of the rotor case. Can be provided.
[Brief description of the drawings]
FIG. 1 is a plan view of the inside of a radial brushed cored small brushless vibration motor showing a first embodiment of the present invention;
FIG. 2 is a longitudinal sectional view of the motor shown in FIG.
FIG. 3 is an internal plan view of a modified example of the motor of FIG. 1;
FIG. 4 is a longitudinal sectional view of a small brushless vibration motor of an axial gap type coreless system showing a second embodiment of the present invention.
FIG. 5 is a plan view of the motor of FIG. 4;
FIG. 6 shows a third embodiment of the present invention and is a longitudinal sectional view of a small brushless vibration motor of an axial gap coreless type.
7 is a plan view of the motor of FIG. 6. FIG.
[Explanation of symbols]
H · Housing 1 · 11 · Stator base 2 · 22 · Shafts 3a to 3f · Armature coils 33a to 33f · Air core armature coils 4 · 44 · Stator cores 4a to 4f · 44a to 44f · Salient poles S, S1 and S2 · · · Stator R, R1, R2 ··· Eccentric rotor 5, 55 · Shallow cylindrical rotor case 5b · First cutout portion 5c and 55c · Second cutout portion 5d and 55d · Third cutout portion 55g · Arc hole 57... Rotor case 57 a center portion 57 b bridge portion 57 c through-holes 6 and 66 shallow cylindrical magnet 67 ring-shaped axial gap magnet 68 ring-shaped flat magnet C cover W, W1, W2, W3 Eccentric weight

Claims (2)

Co the rotor case (57) has a central portion the shaft (2) is supported (57a), a plurality of through holes, leaving a plurality of bridge (57 b) from the central portion (57c) of is formed, the bridging portion inwardly (57 b) of the ceiling portion flat axial air gap-type magnet from (68) is secured, at least a portion of the tungsten alloy eccentric weight (W3) is provided in the rotor case It is fixed to a part of the through hole via an eccentric weight mounting guide, and a through hole (57c) is provided at least on the opposite side via the central portion, and the axial gap type is formed inside the eccentric weight. An eccentric rotor positioned so as to face the magnet and a shaft support portion ( 11a) that rotatably supports the eccentric rotor are integrated, and a resin stator base (11 provided integrally around the shaft support portion ) ) And an air-core armature coil disposed on the upper surface of the stator base so that at least one armature coil of the plurality of air-core armature coils (33a, 33b,...) Is equally divided. And at least two positive and negative terminals arranged on the side of the stator base, and receiving the magnetic force of the axial gap magnet of the eccentric rotor, and having a predetermined shape for controlling the attracting force by the magnetic force of the magnet in the diaphysis (11h) having a Do Ri plurality pieces from the formed magnetic body and a drive circuit member incorporated in the position of the air-core armature coils the deletion in the resin stator base upper surface, said eccentric rotor A flat small brushless vibration motor provided with a cover attached to a side of the stator so as to cover . Rotor case (57) and having a central portion axis (2) is supported (57a), closed at該橋junction outer peripheral portion, leaving a plurality of bridge (57 b) to the least ceiling As a result, a plurality of through holes (57c) are formed, and an eccentric weight (W3) made of tungsten alloy having a portion having the same shape as the through hole is disposed in a part of the through holes. An eccentric rotor in which an axial gap magnet (68) is bonded to a ceiling surface facing the bridge portion and the eccentric weight while the opposite side remains as a through hole, and a shaft support portion that rotatably supports the eccentric rotor. A resin-made stator base ( 11) integrally provided around the shaft support portion, and at least one of a plurality of air-core armature coils, which is equally positioned on the upper surface of the stator base. One armature coil And air-core armature coil arranged a to be divided, at least positive and negative two terminals arranged on the side of the magnet in made of a magnetic material which receives the magnetic force of the axial gap-type magnet of the eccentric rotor A diaphysis (11h) formed in a predetermined shape to control the attracting force by magnetic force, a drive circuit member incorporated in the position of the deleted air-core armature coil on the upper surface of the resin stator base, and A flat, small brushless vibration motor provided with a cover attached to a side portion of the stator so as to cover the eccentric rotor.

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