JP2002325413A - Flat rotary yoke type brushless motor and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spindle motor for driving a media disk, in which a stator can be fixed using a simple constitution, in spite of its being a rotary yoke type, which can be attached directly onto a printed wiring board on the apparatus side and from which low consumption current is obtained. SOLUTION: The stator (S) composed of a plurality of air-core armature coils (1) is arranged to a holder section (B1) erected from a stator base (B); Flat magnets (2) and resin magnets (3), having a turntable function receiving the magnetic fields of the magnets (2) are made to be opposed via axial air gaps respectively interposing the stator; and at least parts of the holder section are formed in feed terminals (B2), while the feed terminals are embedded into a resin constituting a part of the stator base, and led out to the side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat rotary yoke type brushless motor suitable for use in a silent communication means of a mobile communication device, a slide motor for detecting disk media signals, a spindle motor for driving disk media, and the like. It relates to a manufacturing method.

[0002]

2. Description of the Related Art Heretofore, as a flat, small brushless vibration motor used for silent sound notification means of a mobile communication device, the present applicant has previously disclosed Japanese Utility Model Laid-Open No. 4-137463 (Japanese Utility Model Registration No. 2549357), No. -248203. In addition, a similar one is disclosed in
As shown in -98761, there has been proposed a rotor case in which the side surface of the rotor case is folded and decentered. However, since these are not the rotating yoke type but the cored type, there is a problem that the current consumption increases due to the magnet attraction loss and eddy current loss. Also, JP-A-11-987
In such a configuration as shown in No. 61, since the material of a normal rotor case is a thin steel having a specific gravity of about 7, the amount of eccentricity is small, and it is 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 a semi-cylindrical tungsten alloy is formed outside the rotor case.
There is also one as shown in FIG. As a pick-up motor for detecting a signal of a medium by integrating a pinion with a rotor, the present applicant has proposed a coreless brush type motor as shown in FIG. 5 of JP-A-2000-286030. Further, as a spindle motor for driving a disk medium, a cored brushless motor having a turntable for mounting a medium on an output shaft is known.

[0003]

However, in the structure of the vibration motor as disclosed in Japanese Patent Application Laid-Open No. 2000-166173, this danger is avoided because the eccentric weight portion must protrude from the outer diameter of the rotor. , The cover must be attached for easy handling,
There is a dislike that the size becomes large in the radial direction. In other words, the larger the eccentric weight to increase the amount of vibration,
There is a problem that the size in the radial direction is sacrificed. By the way, as shown in FIG. 6, a flat magnet M and a magnetic field of this magnet are interposed between a stator St composed of a plurality of printed wiring coils C as a flat brushless motor used in a rotating yoke type, for example, a headphone stereo or the like. If the rotatable yoke-type rotor Ro, in which the receiving magnetic material m is opposed to the central pulley via an axial gap, is provided, the brake loss due to the magnetic attraction force of the rotor is reduced, and the current consumption is expected to be reduced. Although it is possible, since the stator is separated from the stator base because of the rotating yoke type, a power supply lead is necessary to supply power to the stator in a configuration that tries to avoid exposing one rotating part,
There is a problem that the device cannot be directly attached. Also, in the rotating yoke type, since the stator comes in between, the rotating yoke facing the magnet must be
To assemble the other parts without change, they usually have to be simply placed without fixing. Therefore,
It was difficult to use a spindle motor in which a media disk had to be mounted on the rotating yoke portion, even if low current consumption could be expected.

A first object of the present invention is to make it possible to easily fix a stator with a simple structure in spite of a rotating yoke type, and to directly attach it to a printed wiring board on a device side. The second object is to make the rotary yoke part a turntable so that the turntable does not need to be considered separately and to reduce the thickness.
A spindle motor for driving a media disk that can obtain low current consumption. A third object is to make the rotary yoke portion eccentric so that it can be applied to a vibration motor. And
A fourth object is to provide a geared motor having a pinion in a rotating yoke portion.

[0005]

In order to solve the above-mentioned problems, a stator comprising a plurality of air-core armature coils is arranged on a holder portion raised from a stator base as in the first aspect of the present invention. In a flat rotary yoke type brushless motor including a rotary yoke type rotor in which the flat magnet and the magnetic body receiving the magnetic field of the magnet are opposed to each other through an axial gap between the stator,
This can be achieved by forming at least a part of the holder portion as a power supply terminal and embedding the power supply terminal in a resin constituting a part of the stator base and leading it to the side. A specific structure of the invention can be achieved by the magnetic material comprising a magnet and a magnetic path plate of the magnet. It is preferable that a through hole is provided in the magnetic path plate so that a part of the magnet functions as a medium disk suction. Such a motor
According to a fourth aspect of the present invention, the magnet may be formed of a resin magnet also serving as a turntable, and the magnetic path plate may be made of thin stainless steel and function as a media disk chucking spring. Such a motor is configured as an eccentric rotor by adding a high specific gravity resin body having a density of 3 or more to the magnetic body and cutting off a part of the high specific gravity resin body as described in claim 5 to form an eccentric rotor during rotation. The vibration may be generated, and the resin body attached to the magnetic path plate may be formed in a geared shape by forming a pinion into the pinion. These motors are preferably integrated with a magnetic path plate provided with a falling-off preventing portion as means for attaching a resin body to the magnetic path plate. In order to manufacture such a motor, as shown in claim 8, after the media mounting portion on the outer peripheral portion of the turntable is leveled out with reference to the shaft, the metal portion of the rotor and the shaft are aligned. In manufacturing the flat rotary yoke type brushless motor according to any one of claims 1 to 4 by welding a tip or as shown in claim 9, an outer peripheral portion of the turntable with respect to an axis. This can be achieved by leveling the media mounting portion and then fixing the rotating yoke rotor and the shaft with an anaerobic adhesive.
As a method of using the anaerobic adhesive, as set forth in the tenth aspect, the leveling jig of the media mounting portion on the outer peripheral portion of the turntable is a media disk type, and corrects surface runout using inertia during rotation. Such a configuration may be used.

According to the first aspect of the present invention, the stator can be easily fixed, and the power supply lead is not required, and the stator can be directly mounted on the printed wiring board. According to the second aspect of the invention, the characteristics of the motor can be improved by increasing the air gap magnetic flux density. According to the third and fourth aspects of the present invention, the disk medium can be placed with a simple configuration. In the invention according to claim 5,
A brushless vibration motor can be achieved with a simple configuration. Claim 6
In the invention described in (1), a geared motor can be provided without a special pinion. In the invention according to claim 7, even if the resin body is a magnet, there is no possibility that the resin body will fall off due to the magnetic force of the facing magnet. By employing the manufacturing method according to the eighth, ninth and tenth aspects, the levelness of the turntable can be easily obtained.

[0007]

FIG. 1 shows a first embodiment of the present invention and is a longitudinal sectional view of a flat rotary yoke type brushless spindle motor. FIG. 2 is a longitudinal sectional view of a modified example of the motor of FIG. FIG. 3 shows a second embodiment of the present invention and is a longitudinal sectional view of a flat rotary yoke type brushless vibration motor. FIG. 4 is a plan view of FIG. FIG. 5 shows a third embodiment of the present invention and is a longitudinal sectional view of a flat rotary yoke type brushless geared motor.

Hereinafter, the configuration of the present invention will be described based on each embodiment shown in the drawings. FIG. 1 shows a three-phase axial gap type rotary yoke type brushless spindle motor, that is, a stator S is a wound type air-core armature coil 1.
Are mounted on the printed wiring board 1a. Although not described in detail here, the wound-type air-core armature coil 1 is composed of nine coils each having three phases connected in series. This stator S has a power supply terminal B
Start-up part B of resin-made stator base B with embedded 1
2 and a power supply terminal 1b of the wire wound air core armature 1
Is soldered to the tip of the power supply terminal B1. Inside the rising portion B2, a flat ring-shaped magnet 2 having 12 poles of NS alternately magnetized (not shown) with the stator S interposed therebetween and a resin magnet 3 as a magnetic material are each provided with a gap. The magnetic poles are closed with the NS poles opposed to each other via a magnetic field. The magnet holder 4 holds the flat ring-shaped magnet 2 and the magnetic holder holds the resin magnet 3 functioning as a turntable. The magnetic path plate 5 is provided.
Is a thin magnetic stainless steel, and has at least one chucking spring portion 5a having a function of mounting and lightly holding a media disk, and a flat portion 5b having a function as a magnetic path.
Consists of The magnetic path plate 5 is further provided with a hole 5c and a fall prevention portion 5d through which a resin such as a cut-and-raised part is inserted so as not to be peeled off by the magnetic force of the flat ring-shaped magnet 2 facing thereto. A part of the resin magnet 3 is extended upward using the hole 5c to form a media disk attracting magnet portion 5e also serving as a disk mounting guide. ing. The magnet holder 4 is provided with a recess 4 for escaping the shaft support B2 raised from the resin stator base B.
a and a burring portion 4b at the center following the recess 4a, and the shaft 6 is press-fitted and fixed to the burring portion 4b. In the outer peripheral portion 3a of the resin magnet 3, a media disk mounting portion 3b is bulged. Here, a thin friction sheet F is affixed and completed as a rotary yoke rotor R. As a manufacturing method for achieving horizontality as a turntable, the flat ring-shaped magnet 2 and the magnet holder 4 are mounted on a shaft 6. Later, the stator S
Is mounted on the reference jig J1, and the magnetic path plate 5 functioning as a turntable on the rotating yoke side is set at 0.1 to the axis.
mm and a flattening jig J2 is applied to the friction sheet F, and the run-out is corrected by using the gap. It is welded. If such a manufacturing method is adopted, the turntable and the shaft are securely fixed, and the variation in the thickness of the friction sheet F and the runout of the turntable can be corrected. In the drawing, B4 is a bearing stored in the shaft support portion B2 and rotatably supporting the shaft 6. As a driving method of such a motor, a three-phase unipolar or bipolar sensorless method is used, but its driving principle is well known, and a description thereof will be omitted.
In this way, the magnet in which the two magnets are opposed to each other improves the magnetic flux density by about 1.6 times as compared with the one in which one magnet is provided.

Hereinafter, modifications and other embodiments of the above-described embodiment will be described, but the same members or members having the same functions will be denoted by the same reference numerals and description thereof will be omitted. FIG. 2 shows a rotary yoke type rotor R1 which is a modified example of the first embodiment, in which the magnetic path plate 55 is made relatively thick and the magnetic path plate 55 becomes a skeleton instead of a resin magnet. The turntable 7 is made of an ordinary resin body. In this case as well, it is desirable that the leveling of the turntable 7 be the same as that shown in FIG. 1. Here, the gap between the shaft and the rotating yoke rotor is 0.1 mm or less, which is sealed with an anaerobic adhesive N. . The disc chucking spring 7a is formed integrally with the turntable 7 by a resin body, and the media disc attracting magnet 8 is formed integrally with a magnet formed of sintered rare earth. Here, the leveling jig J2 uses the hardening time of the anaerobic adhesive while horizontalizing during rotation by imparting inertia to the media disk size. In this way, centering can be performed by the horizontal extension jig J2 using the curing time, and the cost of the turntable can be reduced. The fixing time can be shortened by making the anaerobic adhesive UV-curable. In addition to the power supply terminals, a reference motor mounting terminal may be separately derived.

FIGS. 3 and 4 show a brushless vibration motor in which the rotor is eccentric. That is, the eccentric rotor R2 is formed of a resin magnet 33 having a density of about 5 to 6 opposite to the flat ring-shaped magnet 2 and is integrally formed with the magnetic plate 5g. Eccentric.
In this case, the magnetic plate 56 has a portion 3 with one side cut out.
A concave portion 5g is formed at the position 3a, and is made flush with the one that is not cut out so as not to cause a gap loss. Further, since the central portion 33b of the resin magnet 33 is swelled downward and adsorbed to the magnet holder 4, mounting is simple and reliable. Here, the air-core armature coil 11 is configured as a stator S2 of a printed wiring type having four layers. In the above embodiment, although the eccentric rotor, the turning outer diameter portion is circular, so there is no danger at the time of turning, so the cover is omitted, but at the time of reflow soldering, etc. A stainless steel cover (not shown) having a low thermal conductivity may be covered.

FIG. 5 shows an axial gap type brushless geared motor according to a third embodiment of the present invention. The rotor R3 is provided with a pinion P integrated with a magnetic plate 57. I have. The pinion P has a beveled outer gear portion so that the rotor does not fly, and is used in combination with a first gear G as indicated by an imaginary line. In each of the above-described embodiments, a stator in which an air-core armature coil is formed in a winding type as a stator has been described. However, a configuration in which a printed wiring-type air-core armature coil is used can also be employed.

The present invention can take various other embodiments without departing from the technical concept and characteristics thereof. Therefore, the above-described embodiments are merely examples and should not be construed as limiting. The technical scope of the present invention is defined by the appended claims, and is not limited by the description.

[0013]

According to the present invention, with the above-described structure, the stator can be easily fixed with a simple structure in spite of the rotary yoke type, and can be directly mounted on the printed wiring board on the equipment side. The present invention can be applied to a spindle motor for driving a media disk that can obtain a low current consumption by using a portion as a turntable, or can be applied to a vibration motor with an eccentric rotating yoke portion. According to the first aspect of the present invention, the stator can be easily fixed, and the power supply lead is not required, and the stator can be directly mounted on the printed wiring board. In the invention according to claim 2,
The motor characteristics can be improved by increasing the air gap magnetic flux density. According to the third and fourth aspects of the present invention, the disk medium can be placed with a simple configuration. According to the fifth aspect of the invention, a brushless vibration motor can be provided with a simple configuration. According to the invention as set forth in claim 6, the geared motor can be provided without a special pinion. According to the invention described in claim 7, there is no possibility that the magnetic body will fall off due to the magnetic force of the facing magnet. According to the eighth, ninth, and tenth aspects of the present invention, it is possible to manufacture a disk drive spindle motor with less runout of the turntable.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an axial gap type rotary yoke type brushless spindle motor according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a modified example of the motor of FIG.

FIG. 3 is a longitudinal sectional view of an axial gap type rotary yoke type brushless vibration motor according to a second embodiment of the present invention.

FIG. 4 is a plan view of the motor of FIG. 3;

FIG. 5 is a longitudinal sectional view of an axial gap type rotary yoke type brushless geared motor according to a third embodiment of the present invention.

FIG. 6 is a partial longitudinal sectional view of a main part of a conventional rotary yoke type brushless motor.

[Explanation of symbols]

 1} Air-core armature coil 2} Flat ring-shaped magnet 3} Resin magnet 4} Magnet holder 5} Magnetic path plate B {Resin stator base 6} Shaft 7} Turntable S {Stator R, R1} Rotor R2 Eccentric rotor P ‥ pinion

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[Procedure amendment]

[Submission date] April 27, 2001 (2001.4.2
7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

FIG. 5 shows an axial gap type brushless geared motor according to a third embodiment of the present invention, in which a rotor R 3 is provided with a pinion P integrated with a magnetic plate 57. I have. This pinion P is used in combination with a first gear G as shown by an imaginary line with a collar Pa at the lower end so that the rotor does not fly. In each of the above-described embodiments, a stator in which an air-core armature coil is formed in a winding type as a stator has been described. However, a configuration in which a printed wiring-type air-core armature coil is used can also be employed.

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

FIG. 5

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Claims (10)

[Claims] 1. A stator comprising a plurality of air-core armature coils is disposed on a holder portion raised from a stator base,
In a flat rotary yoke type brushless motor including a rotary yoke rotor in which a flat magnet and a magnetic body receiving a magnetic field of the magnet are opposed to each other with an axial gap therebetween, at least one of the holder portions is provided. A flat rotary yoke type brushless motor in which the power supply terminal is formed as a power supply terminal and the power supply terminal is embedded in a resin constituting a part of the stator base and is led out to the side. 2. The flat rotary yoke type brushless motor according to claim 1, wherein said magnetic body is composed of a magnet and a magnetic path plate of said magnet. 3. The flat rotary yoke type brushless motor according to claim 2, wherein a through hole is provided in said magnetic path plate so that a part of the magnet functions as a medium disk suction. 4. The flat rotating yoke type according to claim 3, wherein said magnet is formed of a resin magnet also serving as a turntable, and said magnetic path plate is made of thin stainless steel and functions as a media disk chucking spring. Brushless motor. 5. A high specific gravity resin body having a density of 3 or more is added to the magnetic body, and a part of the high specific gravity resin body is cut out to form an eccentric rotor to generate vibration during rotation. Item 2. A flat rotary yoke type brushless motor according to item 1. 6. The flat rotary yoke type brushless motor according to claim 1, wherein the resin body attached to the magnetic path plate is formed as a pinion to form a geared type. 7. The flat rotary yoke type brushless motor according to claim 1, wherein a fall-off preventing portion is provided as means for attaching a resin body to the magnetic path plate and integrated. 8. A flat rotatable yoke type brushless motor according to claim 1, wherein a jig is used to level out a media mounting portion on an outer peripheral portion of the turntable. And then welding the metal part of the rotor and the tip of the shaft to produce a flat rotary yoke type brushless motor. 9. In manufacturing the flat rotary yoke type brushless motor according to claim 1, a jig is used to level out a media mounting portion on an outer peripheral portion of the turntable. A method of manufacturing a flat rotary yoke type brushless motor, wherein a rotary yoke type rotor and a shaft are fixed with an anaerobic adhesive while the rotation is performed. 10. The flattening jig of a media mounting portion on an outer peripheral portion of the turntable is a media disk type, and is used to correct surface runout by using inertia at the time of rotation.
4. The method for manufacturing a flat rotary yoke type brushless motor according to item 1.