JP3537816B1 - A stator with a built-in Hall sensor and drive circuit, and an axial gap type brushless motor having the same stator - Google Patents

Abstract

An object of the present invention is to obtain a sufficient strength even when each member is made extremely thin while making each member thin. A yoke bracket (1) comprising a magnetic yoke plate (1a) having a detent torque generating portion (1f) and a nonmagnetic space portion, a nonmagnetic bracket plate (1b) bonded to the magnetic yoke plate, and a central portion of the yoke bracket. A shaft support 1c, a stator base 3 attached to the magnetic yoke plate outside the shaft support, a single-phase air-core armature coil 5A, 5B disposed on the stator base, and an air-core armature coil. A hall sensor H arranged on the stator base so as not to overlap with each other in a plan view, a drive circuit member D receiving an output of the hall sensor, and a power supply terminal 3a input to the drive member.

Description

DETAILED DESCRIPTION OF THE INVENTION 【Technical field】

[0001] The present invention relates to a stator in which a hall sensor and a drive circuit member are incorporated, and a brushless motor in the axial direction provided with the stator, which is suitable for use as a silent notification means of a mobile communication device.

[Background Art]

A brushless motor requires a drive circuit in place of a brush and a commutator, but the above-mentioned conventional structures do not have a built-in drive circuit, and require at least four lead terminals for external attachment. Become normal 2
There was a problem that it could not be handled like a terminal type DC motor. In addition, in a normal brushless motor, the stator has a plurality of armature coils arranged evenly over the entire circumference, and the driving circuit components need other electronic components such as ICs, so that they cannot be built in very much. .

The present applicant has previously proposed a flat axial gap type brushless vibration motor which is a coreless slotless type and does not incorporate a drive circuit member. (See Patent Documents 1 and 2) As a brushless vibration motor with a drive circuit, a cored type drive circuit member having a cored type in which an armature coil is wound around a plurality of equally arranged salient poles. A non-circular type is known in which is disposed on the side of the stator. However, such a device has a large size in the side direction, and the mounting efficiency of the SMD method on the printed wiring board on the set side is poor.
Also, since it is a cored type, the thickness must be large, and it is not practical. Therefore, the applicant of the present invention has previously prepared a cored, slotless coreless type including a part of a plurality of armature coils, and provided a space, and provided a drive circuit member in this space. is suggesting. (See Patent Document 4)

[Patent Document 1] Japanese Utility Model Laid-Open No. 4-137463

[Patent Document 2] JP-A-2002-143767

[Patent Document 3] JP-A-2000-245103

[Patent Document 4] Japanese Patent Application Laid-Open No. 2002-142427 (FIGS. 8 to 11)

DISCLOSURE OF THE INVENTION [Problems to be solved by the invention]

[0004] In view of this, the present invention relates to FIGS. 8 to 8 of JP-A-2002-142427 disclosed in the above-mentioned Patent Document 4.
The axial gap type brushless vibration motor shown in FIG. 11 is further improved to have a thin and simple structure, and a drive circuit component can be incorporated so that the same handling as a normal DC motor can be performed. It is intended to provide an extremely thin small brushless vibration motor with sufficient strength.

[Means for Solving the Problems]

In order to solve the above problems, a magnetic yoke plate (1a, 11a) and a nonmagnetic metal bracket plate (1b, 1b, 1b ) bonded to the magnetic yoke plate by a plurality of spot weldings (L) are provided . 11b) , the yoke bracket (1, 11) is provided.
The pivots (1c, 11c) are further arranged in the center of the
The magnetic yoke plate extends radially outward from the shaft support.
At least one detent torque generator (1f)
And a protection formed outside this detent torque generating section.
Holding portion (1g) and a non-magnetic space portion (1
h), and a stator base (3) is additionally provided ,
It is arranged to face this stator base through the center.
The two single-phase air-core armature coils (5A, 5B) are not overlapped with the air-core armature coils in plan view.
One Hall sensor (H) disposed on the stator base at the position of the detent torque generating section , and a Hall sensor that receives an output from the Hall sensor via a center;
And said stator base arranged a drive circuit member at the position of the non-magnetic space (D) so as to be opposed to, the driving times
A power supply terminal (3a) input to the road member is provided with the stator base.
This can be achieved by being provided on the radial side integrally with the base.

[0006] Specifically, the magnetic as shown in claim 2
The non-magnetic metal bracket plate and the conductive plate are 0.12 mm or less
The detent torque generating section is
Extended radially from Part to three approximately equal portions, wherein at least the air-core armature coil of each member provided on the stator base ultraviolet curable adhesive (4), the ultraviolet curable
Make sure the adhesive does not enter the gap from the minimum gap of each member
It is, they are fixed to the stator base.

Further, in order to provide an axial gap motor with such a stator, a shaft having a hall sensor and a drive circuit according to claim 1 or 2 is built into a shaft ( An eccentric rotor (R) rotatably mounted via the rotor yaw ( 2, 22).
(6, 66) and the flat portion (6a) of the rotor yoke.
It is arranged on the outer hanging part (6b) formed following the flat part.
The axial gap type magnet (7)
Following the outer hanging part radially outward of the gap type magnet
The recess (9a) is formed in the tongue piece (6c) extending outward in the horizontal direction.
Eccentric weight (9) received by fitting
And the eccentric weight is connected to the magnet surface.
The cover (10, 100) is fixed to the stator at the opening so as not to protrude into the axial gap from the flat portion and to cover the rotor.

[0008] Specifically, the fixing is performed as described in claim 4.
The means for performing this is preferably by laser welding. To make the shaft fixed type, as shown in claim 5, the eccentric rotor is
Flan inward from the hanging part (6c) on the inner diameter side of the rotor yoke
The flange (6e) is projected and this flange is used as a shaft bearing.
A bearing (8) is disposed, and is rotatably mounted on the shaft (2) via the bearing. The tip of the shaft (2) is a cover member.
The laser is inserted into the central recess (10a) of (10)
What has just been fixed by welding may be used.

According to a sixth aspect of the present invention, the shaft (22) has a tip at the rotor yoke (6).
Bearing that is welded to the center of 6) and rotatably supports this shaft
(77) is disposed on the shaft support (11c) of the stator ,
Proximal end of the shaft to the shaft support may be in what is pivot supports.

【The invention's effect】

[0010] In the invention shown in Claim 1, will be able built easily drive circuit member, the feeding terminal also can also be two terminals of positive and negative, can be obtained day tent torque magnetic yoke plate, to Sufficient strength can be obtained by the non-magnetic bracket plate bonded by spot welding .

According to a second aspect of the present invention, a yoke bracket is provided.
The unit can be made extremely thin, making it a thin motor.
, The day tent torque can be reliably obtained, and the air core armature coil can be fixed without employing molding means, etc.
The adhesive improves the strength.

According to the third aspect of the present invention, the magnet
Is secured by a flat part and a hanging part on the outer diameter side to secure the fixing strength
The arc-shaped weight is positioned by the tongue,
Degree can be secured sufficiently, the rotor can be made extremely thin,
Is not sacrificed, and the recess that fits in the tongue is
There is a large loss at the center of gravity because it is so small relative to the total weight
No eccentric weight moves radially by tongue
Can be prevented and vibration can be generated by the rotor itself.
A brushless vibration motor with a fixed shaft or a rotating shaft with a thinner motor portion can be obtained.

According to the fourth aspect of the present invention, the welding assembly
Since the housing has a monocoque structure, sufficient strength can be obtained.

According to the fifth aspect of the present invention, since the shaft is held by the yoke bracket and the cover, a shaft-fixed vibration motor having sufficient impact resistance can be obtained.

According to the sixth aspect of the present invention, since the base end of the shaft is pivotally supported, a shaft rotary vibration motor capable of reducing sliding loss can be obtained.

BEST MODE FOR CARRYING OUT THE INVENTION

A yoke bracket comprising a magnetic yoke plate having a detent torque generating portion and a non-magnetic space portion, and a non-magnetic bracket plate attached to the magnetic yoke plate is used. Phase air-core armature coil, one Hall sensor arranged on the stator base so as not to overlap with the air-core armature coil in plan view, a drive circuit member receiving an output of the Hall sensor, and a drive member A power supply terminal unit for inputting the power was provided.

Embodiment 1

FIG. 1 is a plan view of main members constituting the stator of the present invention, and FIG. 2 is a plan view of a stator including the same members. The yoke bracket 1 is a magnetic stainless steel plate weaker than an iron plate and has a thickness of 0.1 mm. A thin yoke plate 1a of 0.05 mm to 0.12 mm, and a bracket plate 1b bonded to the yoke plate 1a with a plurality of spot welds L or the like.
Consists of In the center of this bracket plate 1b, a shaft support 1
c is raised in a burring shape, and a cylindrical reinforcing member 1d made of free-cutting brass is press-fitted so as to press down the central portion 1e of the yoke plate 1a. The yoke plate 1a has a central portion 1e pressed by the cylindrical reinforcing member 1d, and a radially extending portion 12a from the central portion 1e.
Three detent torque generators 1 extended at 0 degree angle
f, and a holding portion 1g for closing the detent torque generating portion 1f. The width of these three detent torque generating portions 1f is set to a value that substantially matches the neutral zone of the axial gap type magnet to be combined. Therefore, a non-magnetic space 1h is formed between the detent torque generating sections 1f.

The outer shape of the bracket plate 1b is substantially matched with the yoke plate 1a, and a part thereof is further protruded in the radial direction to form a power supply terminal mounting portion 1k. A thin shaft 2 of 0.5 to 0.6 mm is press-fitted at the base end into the shaft support 1c of the yoke bracket 1 configured as described above, and a stator base 3 made of a flexible printed wiring board is mounted around the shaft. And a part thereof is superimposed on the power supply terminal mounting portion 1k as a power supply terminal portion 3a.

Two air-core armature coils 5A and 5B are mounted on the stator base 3 so as to face each other, and are connected in series so as to form a single phase. In the space between these air-core armature coils 5A and 5B, one Hall sensor H is provided.
Opposite to this, a drive circuit member D made into an IC is arranged. Here, the Hall sensor H is a detent torque generator 1
On f, the drive circuit members D are set so as to be respectively located in the space portions in plan view.

Here, the positional relationship between the detent torque generator and the single-phase air-core armature coil is determined by setting the effective conductor of the air-core armature coil in accordance with the magnetic pole of the magnet described later. Is preferably set such that a minimum stop torque can be obtained when the magnet is stopped by the magnetic force of the magnet.

The stator as described above is fixed to the stator base 3 with an ultraviolet curing adhesive 4 from the periphery of the reinforcing member 1d to the two air-core armature coils 5A and 5B, the Hall sensor H and the drive circuit member. . Here, the reinforcement by the ultraviolet-curing adhesive 4 requires at least a part of the air-core armature coil and the periphery of the reinforcing member. Naturally, a member (in this case, air-core) The casting amount is controlled so as not to protrude above the armature coil). Here, the periphery of the reinforcing member 1d is preferably welded to the yoke plate by laser welding. Therefore, these stator members are not superimposed in a plan view, and can be configured to be thin, and the impact resistance is improved by the ultraviolet curable adhesive.

As a modification of the above embodiment, the reinforcing portion
Although not particularly shown, the material is formed in a simple sleeve, and
The yoke bracket is attached to the outer portion of the yoke plate 1a
Combine the ket plates 1b together to form a burring shape
May be press-fitted. By doing so, the outer shape of the reinforcing member with respect to the shaft becomes large, so that press-fit strength is secured.
it can. Also, a part of the outer periphery of the reinforcing member and the yoke bra
The burring tip of the bracket may be fixed by laser welding.
No.

Embodiment 2

FIG. 3 is a longitudinal sectional view of a coreless slotless brushless vibration motor of a fixed shaft type provided with a stator shown in FIG. The eccentric rotor R rotatably mounted on the shaft 2 includes a thin rotor yoke 6 made of magnetic stainless steel, an axial gap type magnet 7 disposed on the thin rotor yoke 6, and a flange disposed on the inner diameter of the magnet 7. The rotor yoke 6
Is a thin 0.1 mm and surrounds the flat portion 6 a receiving the magnetic field of the magnet 7 and the outer diameter portion of the magnet.
Outer diameter side depending portion 6b to secure the sea urchin arcuate eccentric weight 9
And a tongue piece 6d integrally protrudes outward in the horizontal direction from the outer diameter side hanging portion 6b, and a flange 6e is horizontally inwardly extended from the inner diameter side hanging portion 6c. protrudes, the eccentric weight 9 recess 9
a by fitting it with the tongue piece 6d
Do not protrude axially from the flat part and the magnet surface
The flanged sintered oil-impregnated bearing 8 is attached to the inner diameter side flange 6e by caulking or spot welding. By doing so, the eccentric weight 9
Is composed of the tongue 6 d fixed with brazing or adhesive bonding, the magnet 7 in the case of bonding or rare earth sintered metallic magnet attached by spot welding or the like.

The eccentric rotor R configured as described above is rotatably mounted on the shaft 2 via at least two laminated thrust washers S1 in order to reduce brake loss. Thereafter, a cover member 10 made of a thin non-magnetic stainless steel material is covered, and the tip of the shaft is fitted into a burring hole 10a formed in the center of the cover member 10 via a thrust washer S2. Here, the burring hole is smaller than the shaft diameter so that the tip of the shaft 2 does not protrude. This tip portion is laser-welded to the cover member 10 to prevent deformation, and the cover member is The opening 10 is the yoke bracket 1
It is assembled by laser spot welding on the outer periphery of. Therefore, since it is assembled by welding as described above, the structure becomes a monocoque structure as a whole, so that sufficient strength can be obtained even when a thin member is used.

Embodiment 3

FIG. 4 is a longitudinal sectional view of a shaftless brushless vibration motor of a coreless slotless type in an axial gap type. Hereinafter, the same members or substantially the same members having the same functions as those of the above-described embodiment are denoted by the same reference numerals, and description thereof may be omitted. That is, in the center of the yoke bracket 11, the slightly larger shaft support portion 11c has the magnetic yoke plate 11a protruding upward in a burring shape, and the same sintered oil-impregnated bearing 77 as described above is stored therein. Other parts of the yoke bracket 11 are the first parts.
The description is omitted because it is similar to the embodiment.

On the other hand, the tip of the shaft 22 of 0.6 mm is directly press-fitted into the center of the rotor yoke 66, and the eccentric rotor R1 is laser spot welded to the rotor yoke 66. The other end of the shaft 22 is pivotally supported on a bracket plate 11b of the yoke bracket 11 via a ball bearing B of about 0.3 mm via a thrust washer S3. Here, instead of the ball bearing B, the base may be formed with a round base. Of course, the cover member 100 may be a blind type.

[Industrial applicability]

The stator of the present invention can be applied not only to a vibration motor but also to a normal rotary motor. The present invention can take various other embodiments without departing from the technical idea and characteristics thereof. Therefore, the above 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.

[Brief description of the drawings]

[0028]

FIG. 1 is a plan view of main members constituting a stator of the present invention.

FIG. 2 is a plan view of a stator including the same member. (Example 1)

FIG. 3 is a longitudinal sectional view of a fixed shaft type axial gap type coreless slotless type brushless vibration motor having the stator of FIG. 2; (Example 2)

FIG. 4 is a vertical cross-sectional view of a shaftless brushless vibration motor of a coreless slotless type in an axial gap type. (Example 3)

[Explanation of symbols]

[0029] 1,11 Yoke bracket 1a, 11a Magnetic yoke plate 1b, 11b Non-magnetic bracket plate 2, 22 axes 3 Stator base 4 UV curable adhesive 5A, 5B air core armature coil 6, 66 Rotor yoke R, R1 Eccentric rotor H Hall sensor D drive circuit members 7 Axial gap type magnet 8 Sintered oil-impregnated bearing with flange 9 Arc-shaped eccentric weight 10, 100 cover member

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-154250 (JP, A) JP-A-8-154356 (JP, A) JP-A 2002-142427 (JP, A) JP-A 2003-88805 ( JP, A) JP 2000-60054 (JP, A) JP 2001-339915 (JP, A) JP 2001-286089 (JP, A) JP 2000-82252 (JP, A) JP 2003-180050 ( JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B06B 1/16 H02K 7/065 H02K 11/00 H02K 21/00 H02K 29/08

Claims (6)

(57) [Claims] 1. A magnetic yoke plate(1a, 11a)And this magnet
To the yoke boardWith multiple spot welding (L)Competing
Non-magneticmetalBracket plate(1b, 11b)Consists of
Yoke bracket(1, 11) is provided and this yoke
The bracket is further provided with pivots (1c, 11c) at the center.
The magnetic yoke plate extends radially outward from the shaft support.
At least one detent torque generating section (1
f), formed outside the detent torque generating portion.
Holding part (1g) and non-magnetic space part surrounded by these
(1h), andStator base(3)Is attached
This stator baseFacing each other through the center
Two of the arrangedSingle phase air core armature coil(5A, 5B)
Do not overlap with this air-core armature coil in plan view
likeAt the position of the detent torque generatorThe stay
One Hall sensor arranged on the database(H)And the e
Receiving the output from theThings in the center through the hall
At the position of the non-magnetic space so as to face the sensorSaid
Drive circuit members arranged on the stator base(D)And this
DrivecircuitPower supply terminal for input to members(3a)ButThe step
Radially sideways with the motor baseIt is special that
A stay with built-in hall sensor and drive circuit
Ta. 2. The magnetic plate and the non-magnetic metal bracket
The board has a thickness of 0.12mm or less, and the detent
The luk generating part is radially divided into three equal parts from the shaft support part.
The air core armature coil of at least one of the members extended and arranged on the stator base is made of an ultraviolet curable adhesive.
In (4) , the ultraviolet-curable adhesive is applied to a minimum gap portion of each member.
The stator according to claim 1, wherein the hall sensor and the drive circuit are fixed to the stator base so as not to go out of the gap . 3. An eccentric rotor (R) rotatably mounted via a shaft (2, 22) to a stator containing the Hall sensor and the drive circuit according to claim 1 or 2, wherein the rotor is provided. Are the rotor yokes (6, 66) and the rotor yokes
Flat part (6a) and the outer part formed following the flat part
Axial gap type magnet arranged in the side hanging part (6b)
(7) and the radially outer side of the axial gap magnet
A tongue extending horizontally outwardly following the outer hanging part
The recess (9a) was fitted to (6c) and received.
And an eccentric weight (9).
Project from the magnet surface and the flat part into the axial gap.
It becomes as to not cover so as to cover the rotor
(10, 100) is an axial gap type brushless motor fixed to the stator at the opening. 4. The fixing means is formed by laser welding.
The axial gap type brushless motor according to claim 3, wherein 5. The eccentric rotor according to claim 1, wherein the eccentric rotor is an inner diameter side of a rotor yoke.
The flange (6e) protrudes inward from the hanging part (6c).
A bearing (8) is disposed on the flange as a shaft bearing, and is rotatably mounted on the shaft (2) via the bearing.
The tip of the shaft (2) is a recess at the center of the cover member (10).
The axial gap type brushless motor according to claim 3 , wherein the motor is fitted in (10a) and fixed by laser welding . 6. The shaft (22) has a tip welded to the center of the rotor yoke (66), and a bearing (77) for rotatably supporting the shaft is disposed on a shaft support (11c) of the stator. 4. The brushless motor according to claim 3 , wherein a base end of the shaft is pivotally supported on a support.