KR20070021956A - Stator and axial-gap brushless vibration motor comprising same stator - Google Patents

Abstract

The present invention relates to a stator base comprising a printed wiring board mounted on a nonmagnetic or weak magnetic bracket having a shaft support disposed in the center thereof, a single-phase connection air core armature coil disposed on the stator base, and the air core armature coil. The drive circuit member is disposed on the stator base so as not to overlap with the stator base, and the stator base has a groove hole extending outwardly from the central transmission hole, and has a detent torque made of a magnetic body disposed around the shaft support. The detent torque portion extending radially from the center of the generating member is accommodated in the groove hole so as to be accommodated within the thickness of the stator base.

Description

STATUS AND AXIAL-GAP BRUSHLESS VIBRATION MOTOR COMPRISING SAME STATOR}

1 is a plan view of a stator base as a main member constituting the stator of the present invention.

2 is a plan view of a detent torque generating member mounted to the stator base.

3 is an assembly view of the stator having these members.

4 is a longitudinal sectional view of an axial air gap brushless vibration motor having such a stator.

FIG. 5 is a sectional view of principal parts of a modification of the stator portion shown in FIG. 4. FIG.

6 is a sectional view of principal parts of another modification.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a stator formed in a slim type and an axial air gap brushless vibration motor having the stator, which is suitable for use in a silent notification means of a mobile communication device.

As a flat axial air gap brushless vibration motor, a coreless slotless type of one bearing has been proposed (see Patent Documents 1 and 2).

A brushless vibration motor with a drive circuit is a cored type and is a cored type formed by winding an armature coil around a plurality of equally arranged salient poles, and having a drive circuit member arranged on the side of the stator. Circular ones are known (see Patent Document 3).

However, these devices have a large lateral size, so that the mounting efficiency of the set of printed wiring boards is poor in the SMD method, and because they are cored, they have a thick thickness and are not practical.

In addition, it has been proposed to include a cored and slotless coreless type in which a part of the plurality of armature coils is deleted to create a cavity, and to arrange a driving circuit member in the void space (see Patent Document 4). ).

[Patent Document 1] Japanese Utility Model Publication H4-137463

[Patent Document 2] Japanese Patent Laid-Open No. 2002-143767

[Patent Document 3] Japanese Patent Laid-Open No. 2000-245103

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

By the way, in the single-phase type driven by one hall sensor, a detent torque generating member made of a magnetic material is required in order to stop the position of the magnet of the rotor at a specific place which can be reliably started next time.

Since the detent torque generating member requires a certain thickness in order to obtain the necessary detent torque generating force, it is difficult to make an arrangement space by placing it on the bracket, and thus there is a problem that the detent torque generating member is opposed to the slimming of the motor itself.

In addition, when the detent torque generating member is formed by, for example, printing, a certain thickness and width are required to obtain the necessary detent torque generating force, and when the width is widened, the position of the detent torque generating unit is unstable. If the width is reduced, the width is substantially changed at the expense of thickness.

On the other hand, it has been proposed that the detent torque portion of the detent torque generating member is accommodated in the inner diameter of the air core armature coil so that the thickness of the detent torque generating member can be substantially ignored. There is a problem that can not increase the number of windings. That is, the arrangement position of the detent torque portion needs to be deliberately shifted from the center of the coil so as to stop at the position of the magnetic pole or the neutral portion to avoid starting errors. You cannot increase the angle. Failure to maintain a predetermined shift angle sacrifices the number and position of effective conductor portions contributing to torque, resulting in a reduction in starting torque.

Therefore, the present invention makes it possible to completely ignore the arrangement thickness of the detent torque portion of the detent torque generating member, so that the position (deviation angle) of the optimum optimum detent torque generating member is independent of the size of the inner diameter of the coil. It is an object of the present invention to provide an extremely thin stator and an axially spaced brushless vibration motor having the stator.

In order to solve the above problems, as shown in claim 1, a nonmagnetic or weak magnetic bracket having a shaft support portion disposed in the center;

A stator base comprising a printed wiring board installed on the bracket;

A single-phase concentric armature coil disposed on the stator base;

A drive circuit member disposed on the stator base so as not to overlap the single-phase concentric armature coil;

A detent torque generating member made of a magnetic material is provided;

At least a portion of the detent torque generating member can be achieved by being accommodated within the thickness of the stator base.

Specifically, as shown in claim 2, the stator base is provided with a central through hole and at least one groove hole extending outward from the central through hole.

As the part of the detent torque generating member, the detent torque generating member may have at least one detent torque portion extending in the radial direction, and the detent torque portion may be accommodated in the groove hole.

Specifically, as the shaft support portion, a plurality of support portions protruding from the nonmagnetic or weak magnetic bracket as shown in claims 3 and 4, and a bearing disposed inside the support portion, the reinforcing member on the outer periphery of the support portion Or a cylindrical metal bearing holder integrated with the bracket as the shaft support portion, and a bearing disposed inside the metal bearing holder, and the metal bearing holder may be reinforced with an outer circumference.

In order to form an axially spaced brushless vibration motor using such a stator, as shown in claim 5, the stator according to claim 1, and a rotor in which the stator is combined through an axial gap, are provided with a rotor yoke and a rotor yoke. And an axial air gap magnet fixedly attached to the rotor yoke, and an arc-shaped eccentric weight, wherein the eccentric weight is fixedly attached to the outer circumference of the magnet, and a part of the eccentric weight is fixedly attached to the rotor case. This can be achieved by attaching the outer case to the stator so as to cover it.

A stator base made of a printed wiring board is installed on a non-magnetic or weak magnetic bracket having an axial support in the center, and a single-phase concentric armature coil is disposed on the stator base, and a driving circuit is provided on the stator base so as not to overlap the concentric armature coil. A stator with a member disposed therein, wherein the stator base has a central through hole to which the shaft support is mounted, and two to four groove holes extending outwardly from the central through hole, and have a magnetic body around the shaft support. The detent torque generating member is disposed, and the detent torque portion extending in the radial direction from the detent torque generating member is accommodated in the groove hole.

(Example 1)

In Figures 1 to 3, the bracket 1 constituting the stator of the present invention is a non-magnetic or weak magnetic stainless panel is formed in a slim shape of about 0.2mm thickness, four support pillars (1a) in the center press Punched and erected by processing, the inner bottom portion has a sintered oil-impregnated bearing 2a constituting the shaft support 2 through a thrust washer 2b as shown in FIG. It is stored. The bracket 1 further has a feed terminal mounting portion 1c extending laterally.

On the upper surface of the bracket 1, a detent torque generating member 3 made of a magnetic stainless panel having a thickness of about 0.1 mm is disposed by being fitted to the support pillar 1a of the shaft support 2.

The detent torque generating member 3 has the same pitch as the center portion of the through hole 3a having a guide 3g adapted to the pitch of the support pillar and a groove hole formed in the stator base to be described later in the radial direction from the center portion. The formed detent torque part 3b is formed.

The stator base 4 combined with the detent torque generating member 3 is made of a glass fiber epoxy substrate having a thickness of about 0.15 mm including a printed wiring area, and in the center of the detent torque generating member 3. A perforated hole 4a to be mounted on the outer shape and a guide hole 4b for mounting an air core armature coil formed at a 90 ° pitch on the outside thereof are formed, and are connected to the perforated hole 4a and have three groove holes 4c in the radial direction. ) Is formed at an arrangement opening angle of 90 °, and an air core armature coil connection pattern 4p, with a disposable pattern 4d at a position necessary to cover the lack of strength due to the groove hole. ), The connection pattern 4q of the driving circuit member D is formed.

The groove hole 4c is formed at a position where the opening angle is about 22.5 ° from the center of each armature coil mounting guide hole 4b, which is the center of the air core armature coil to be arranged, to secure the strength of the thin stator base. It is isolated so as not to be connected with each said armature coil mounting guide hole 4b, and is twisted so that it may become almost 90 degrees from the predetermined position of each centerline Y. The feed terminal portion 4e extends at the side of the feed terminal placing portion. Of course, each area pattern is resist-treated except for each solder connection part shown by small dots.

When the opening angle of the detent torque part 3b is set to 22.5 ° from the center of the coil, the opening angle of the magnetic pole of the axial pore magnet of the rotor to be combined is 90 °, whichever peak or neutral of the magnetic pole is. It is determined as a position where the magnet may stop.

In the case of six poles in which the opening angle of the magnetic pole of the axial air gap magnet of the rotor to be combined is 60 °, the arrangement opening angle of the detent torque portion 3b is preferably set to 15 ° from the center of the coil.

In the stator base 4, as shown in the assembly diagram of FIG. 3, three air core armature coils 5 wound by a winding shaft of approximately the same size as the air core armature coil mounting guide hole 4b are mounted. A jig or the like is fixed and attached to the position of the guide hole 4b with a UV-curable anaerobic adhesive, and the terminal is connected to the predetermined wiring pattern 4p by soldering so as to be in a single phase.

In the above description, three air-core armature coils are shown. However, as long as they are connected in a single phase, the thickness may allow the construction of one air-core armature coil. If it does not interfere, it may consist of four coils.

In addition, in FIG. 3, since it is complicated, an air core armature coil terminal, each connection area pattern, etc. are abbreviate | omitted.

Here, the armature coil mounting guide holes 4b adopt a step of covering the stator base 4 by attaching a coil to a jig and applying an adhesive after mounting each air core armature coil 5. If you do not need to form.

The drive circuit-integrated drive circuit member D for driving the air core armature coil 5 is connected by soldering at a position where an appropriate electric neutral point is obtained without overlapping with the air core armature coil 5 in plan view. Here, the position of the built-in Hall sensor is determined according to the magnetic poles of the magnets to be combined, and in the case of the magnetic pole having four poles, any one of 45 °, 90 °, 135 ° and 180 ° from the center of the air core armature coil is used. It is arranged to come to the position of.

This stator base 4 is installed on the bracket 1 via an ultraviolet curable anaerobic adhesive. At this time, the detent torque portion 3b is mounted to the groove hole 4c, and the through-hole 4a is accommodated outside the center portion of the detent torque generating member 3, so that the detent torque generating member ( 3) at least the detent torque part 3b is completely accommodated in the thickness direction in the stator base 4, and as a result, the thickness does not need to be considered at all. In other words, it is possible to set the optimum position to obtain a sufficient starting torque without forcibly accepting the inner diameter of the air core armature coil.

Since it is assembled in this way, since the hole 1d after the support pillar 1a is erected is blocked by the stator base 4, it is possible to prevent foreign matter from entering.

(Example 2)

Fig. 4 shows a brushless vibration motor of the axially rotatable, axially-spaced coreless slotless system with the stator described above.

The stator side has already been described except for a part thereof, so it will be omitted. For the purpose of strength support of the support pillar 1a, here, a ring washer made of vulcanized fiber is used by using a dead space in the thickness direction of the rotor, which will be described later. (ring washer, S) is press-fitted to the outer periphery of the support column 1a, and the lower part is fixedly attached to a part of the upper surface of the air core armature coil 5 with a UV adhesive.

In this case, since it is reinforced by the ring washer (S), even if the support pillar is thin, the impact strength in the radial direction is secured.

The base end of the shaft 7 is supported by the thrust washer 2b inserted below the sintered bearing 2a, and the receiving portion 1e of the bracket 1 is slightly raised. Is supported by

Since the receiving part 1e rises inward in an arc shape, it can fully endure an impact, such as a fall.

The eccentric rotor R is accommodated in the outer case 8 constituting the housing, and is attached to the outer circumference of the bracket 1 by laser welding Y at the opening.

The eccentric rotor R, which faces the stator through the axial gap, includes an axial gap magnet M and an arc-shaped eccentric weight W disposed on a part of the outer circumference of the magnet M. And a rotor case 6 having a thickness of about 0.15 mm fixedly attached thereto, and a shaft 7 fixedly attached to the center of rotation of the rotor case 6, and at the rotation center of the rotor case 6, A shaft 7 is press-fitted, and a burring shaft holder 6b having a small diameter portion 6a that supports the tip is provided, followed by a reinforcing rib (6b). 6c) is formed.

The rotor case 6 is formed with a flat portion 6d to which the upper portion of the magnet M is bonded, followed by a first outer diameter side droop portion 6e and an inner diameter side droop portion 6f. do.

A portion of the outer diameter lower portion extends to become the second outer diameter lower portion 6g and covers a portion of the outer diameter of the eccentric weight W. As shown in FIG.

The reinforcing rib 6c is connected to the inner diameter side drooping portion 6f. For this reason, even a thin rotor case can fully secure strength.

In this case, the tip of the shaft 7 is further laser welded to secure the strength.

In adhering the magnet M, the adhesive strength is secured by the inner diameter dripping portion 6f and the outer diameter dripping portion 6e, and the eccentric weight W is along the outer diameter of the magnet M. By the concave-convex joint fitted to the extended second outer diameter lower part 6g and a part of the rotor case 6, the strength can be sufficiently secured similarly.

The opening of the outer case 8 covering the eccentric rotor is attached by laser spot welding at the outer periphery of the bracket 1 on the stator side.

(Example 3)

FIG. 5 is a configuration in which the cylindrical brass bearing holder H is integrated into the bracket 1 by caulking or the like as a shaft support part by arranging a sintered bearing in the bracket 1.

The same reference numerals are used for the same members as the above-described embodiment, and description thereof will be omitted.

The cylindrical brass bearing holder is bonded and reinforced so that the ultraviolet curable adhesive S is embedded in the air core armature coil 5 or the drive circuit member D on the outer circumference.

In this way, sufficient strength can be ensured even if the caulking strength of the cylindrical brass bearing holder H is insufficient.

(Example 4)

Fig. 6 is a variant of the stator portion as an axial support portion, in which a bearing is made of resin itself having good sliding mobility.

That is, from the bracket 11, the plurality of support pieces 11a which seem to shorten the above-mentioned support column 1a are raised, and the resin support 22a is provided as the axial support part 22 so that the said support piece 11a may be embedded. It is. Since the hole in which the support piece is erected is filled with a part of the resin bearing, the appearance and strength can be secured.

In this way, the sintered bearing can be eliminated.

FIG. 6 further shows that the lower part of the outer case 88 extends as a flange 88a in the circumferential direction so as to be suitable when employed for the central magnetic pole of the electroacoustic transducer, and by the uneven coupling with the bracket 11 of the stator. The magnetic body 8m is arranged around the outer case 88, where Mg is an excitation magnet on the speaker side, C is an excitation coil, and SS is a vibrating thin plate, And SH is the speaker housing.

Here, the outer case 88 is at least a ceiling portion is non-magnetic so that the magnetic force of the excitation magnet (Mg) of the speaker side does not affect the magnet of the rotor, the magnetic field of the excitation magnet (Mg) is the magnetic material (8m) Is accepted. In the case where the size of the magnetic body 8m is separately placed and attached, the diameter of the magnetic body may be fixed to the side circumference while the ceiling is made non-magnetic in the form of a disk panel.

Since the detent torque portion on the stator side is isolated from the outer case 88, the influence of the excitation magnet Mg on the speaker side is not affected.

In the invention described in claim 1, since the detent torque portion of the detent torque generating member is included in the thickness of the stator base, the thickness can be ignored and can be set to a position irrelevant to the inner diameter of the air core armature coil. Since the inner diameter of the air core armature coil is made small, the number of turns can be increased, and sufficient starting torque is obtained, and each member constituting the stator is not overlapped, so that it can be made very thin.

In the invention shown in claim 2, the positioning of the detent torque portion is easy, and the detent torque generating member can be set at a stable constant position.

In the invention described in claim 3, it can be easily configured without using a separate member as the shaft support.

In the invention shown in claim 4, the shaft support portion can also be constituted by a metal bearing holder having sufficient strength.

In the invention shown in claim 5, a thin vibration motor capable of ignoring the thickness of the detent torque generating member as an axial air gap type motor is obtained.

In the invention shown in claim 6, it not only functions as a vibration motor, but also can be used for central stimulation of an electroacoustic transducer. In this case, since the detent torque portion of the detent torque generating member is sufficiently isolated from the magnetic body portion of the outer case, it is not affected by the magnetic field of the excitation magnet of the electroacoustic transducer.

The stator of the present invention is not limited to a vibration motor, but can also be employed in a conventional rotary single-phase brushless motor such as a general fan motor. If the shaft is fixed to the shaft support portion, the shaft can be a stator type stator. In this case, the bearing may be disposed on the rotor and the tip of the shaft may be fixed to the outer case.

The present invention can adopt other various embodiments without departing from the spirit and features thereof. Therefore, the above-described embodiment is merely an example and should not be interpreted limitedly. The technical scope of the present invention is disclosed by the claims, and is not limited to the specification text.

Claims (6)

A nonmagnetic or weak magnetic bracket having a shaft support disposed in the center thereof; A stator base comprising a printed wiring board installed on the bracket; A single-phase concentric armature coil disposed on the stator base; A drive circuit member disposed on the stator base so as not to overlap the single-phase concentric armature coil; A detent torque generating member made of a magnetic material is provided; At least a portion of the detent torque generating member is received within a thickness of the stator base. The method of claim 1, The stator base is provided with a central through hole and at least one groove hole extending outward from the central through hole, The detent torque generating member as part of the detent torque generating member has at least one detent torque portion extending in the radial direction, wherein the detent torque portion is stored in the groove hole. The method of claim 1, A stator comprising: a plurality of support portions protruding from the non-magnetic or weak magnetic bracket as the shaft support portion, and bearings arranged inside the support portion, wherein a reinforcing member is disposed on an outer circumference of the support portion. The method of claim 1, A stator comprising a metal bearing holder having a lower side integrated with the bracket as the shaft support and a bearing disposed inside the metal bearing holder. The stator of Claim 1 and the rotor which were combined with the stator through the axial gap are provided, The rotor is provided with a rotor yoke, an axial void magnet fixedly attached to the rotor yoke, and an eccentric weight of an arc shape, The eccentric weight is fixedly attached to the outer circumference of the magnet, while a part is fixedly attached to the rotor case, An axial air gap brushless vibration motor having an outer case attached to the stator to cover the rotor. The method of claim 5, The outer case has at least a ceiling portion of nonmagnetic or weak magnetic material, at the same time having a magnetic material on the side circumference, and the lower portion of the magnetic material extends as a flange in the circumferential direction and is combined with the bracket of the stator in the axial air gap type. Vibration motor.

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