JPH07298590A - Coreless cup motor - Google Patents

Abstract

PURPOSE:To manufacture a coreless cup motor having a small outer diameter readily at low cost by forming an end cap, a bearing holder and a stator yoke as a one body, using only one bearing metal and reducing the number of parts. CONSTITUTION:A bearing holder part 2c is formed at a hollow end cap 2 of the magnetic body at one-end opening part of a cylindrical motor housing 1 as a one body. A stator yoke part 2e having the small outer diameter is further formed at the other end part as a unitary body. A field magnet 3 is fixed to the stator yoke part. A metal bearing 6 is inserted into a metal-bearing containing part 2b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-bearing (bearing) cup-type coreless motor. More specifically, the present invention is suitable for a cup-shaped coreless vibration motor which is used in a vibration alarm device such as a pager [calling device] and has an extremely small outer diameter of 3 mm or 4 mm.

[0002]

2. Description of the Related Art In a pager [so-called pager], in order to notify that a telephone call is made, in recent years, a vibration method is used instead of sound. The type of page that causes this vibration
In the jar, a semi-circular eccentric counter [weight] is fixed to the motor shaft. When the shaft rotates, the eccentric counter rotates with partial circle eccentricity, and its vibration is
Since it is transmitted to the housing, the vibration propagates to the housing of the pager equipped with the motor with the eccentricity counter, and the person wearing the pager senses the vibration and calls the telephone. Get to know that

Most of the motors used in this pager are coreless motors, and core type motors are rarely seen. There are various reasons why a coreless motor is used, but it has better start-up characteristics and shock resistance than a core type motor, so there is a risk of damage to the motor even if the pager is dropped. This is because it has the advantages of low power consumption and low current consumption.

A cup type coreless vibration motor 13 'using this conventionally used cup type coreless motor will be described below with reference to FIG.

The motor 13 'penetrates through the center of the cylindrical coreless armature 4, the commutator hub 8, the commutator 7 composed of a group of commutator pieces formed on the commutator hub 8, and the commutator hub 8. The rotor has a shaft 9 fixed to the commutator hub 8. A hollow end cap 2'made of resin is attached to one end of a cylindrical motor housing 1 made of a magnetic material, and a brush base 11 'also serving as a cap is attached to the other end of the motor main body 12'. To form. Brushes 10-1 and 10-2 are mounted on the brush base 11 ′, and the brush 10 is brought into sliding contact with the commutator 7. One brush 10-1 is electrically connected to a positive power supply terminal (not shown) by a lead wire 14, and the other brush 10-2 is electrically connected to a negative power supply terminal (not shown) by a lead wire 14. Connect to.

A cylindrical field magnet positioning protrusion 15 having a small diameter is integrally formed on the inner surface of the end cap 2 ', and one end of the cylindrical field magnet 3 is positioned and fixed on the outer periphery of the field magnet positioning protrusion 15. 3 to end cap 2 '
Fixed to. The end cap 2'has a shaft through hole at the center, and the shaft 9 of the rotor passes through the field magnet 3 and a copper metal bearing 6'provided in the shaft through hole of the end cap 2 '. -1 and a copper-based metal bearing 6'-2 provided on the inner circumference of the other end of the field magnet 3 so as to be rotatable. An eccentric counter 16 for generating vibration is attached to the shaft 9 protruding from one end of the motor body 12 '.

[0007]

According to such a motor 13 ', since there is a radial gap 17 between the shaft 9 and the field magnet 3, the magnetic flux of the field magnet 3 cannot be closed sufficiently. The motor was inefficient.
Moreover, since the end cap 2'is made of resin and is non-metallic, and the metal bearings 6'-1 and 6'-2 are also made of copper-based non-magnetic material, the field magnet 3 Could not close the magnetic path of the motor, and the motor 13 '
Leakage magnetic flux was generated from one end of the motor, resulting in poor motor characteristics. At one end of the motor 13 ', the magnetic flux leaks due to the short distance between the field magnet 3 and the end cap 2', but at the other end there is a commutator hub 8 etc. Magnetic magnet 3 and brush stand 1
Since the distance to 1'is short, the magnetic flux leakage is small and can be ignored.

In case of the motor 13 ', there is an outer diameter of 6 mm, but the outer diameter is further reduced to 3 to 4 m.
If it is attempted to form a magnet having a size of m, the field magnet 3 must be thin and has a small outer diameter because of the space limitation, and the magnetic flux of the field magnet 3 is inevitably weaker. The motor characteristics are deteriorated, and it is not possible to construct one that can withstand use as a vibration generator such as a pager.
Further, the leakage magnetic flux of the field magnet 3 causes an erroneous signal in a certain frequency band in the case of a certain type of pager, and is very disliked, and a countermeasure against the leakage magnetic flux is required.

Therefore, it is conceivable to provide a cylindrical stator yoke on the inner circumference of the field magnet 3, but there is a drawback that the number of parts is increased by the amount of the stator yoke. Since it is very difficult to assemble a motor having a very small outer diameter, it is necessary to reduce the number of fixtures as much as possible in order to facilitate the assembly.

The outer diameter of the motor 13 'is 6 m.
It is a very small m, and the precision of parts is required to be severe. Even a slight error has a great influence on the motor characteristics. Nevertheless, the shaft 9 fixed to the commutator hub 8 has two separate metal bearings 6'-1 and 6'-2.
It is designed to pass through the shaft through hole. However, if the concentricity of the shaft through holes of the two separate metal bearings 6'-1 and 6'-2 is not accurately obtained, the shaft through holes of the two metal bearings 6'-1 and 6'-2 are not provided. A manufacturing problem arises in that the shaft 9 cannot be passed through.
Alternatively, the shaft 9 and the metal bearings 6'-1, 6'-2
The relative lateral pressure of the was increased, adversely affecting the life characteristics and noise characteristics.

The eccentricity counter 16 rotates while partially eccentrically rotating to generate vibrations, but two short metal bearings 6'-1 having a long distance like the motor 13 'described above.
Even if the shaft 9 is supported by 6 and 6′-2, with such a structure, the deflection of the shaft 9 cannot be sufficiently suppressed. In particular, the end cap 2'is thin, and the metal bearing 6'-1 is also formed to be short in the axial direction, and the metal bearing 6'-2 is also small on the inner circumference of the other end of the field magnet 3. Since the length is short, the shake of the shaft 9 cannot be suppressed sufficiently. For this reason, the shaft 9 applies excessive lateral pressure to the metal bearings 6'-1 or 6'-2 to deteriorate noise characteristics and life characteristics, and the cylindrical coreless armature 4 causes the field magnet 3 or the motor housing 1 to be damaged. The cylindrical eccentric armature 4 is broken and the motor is damaged, and the shaft 9 having a very small outer diameter is bent. However, it has a drawback in that it collides with the vehicle and produces a loud noise, and the motor 13 'cannot be driven.

Further, in the case of this motor 13 ', a cylindrical coreless armature wound in a hexagonal shape [see FIG. 2] 4 is used in consideration of the ease of manufacture and the good motor efficiency. Often. In the case of this cylindrical coreless armature 4, the conductor portions which are diagonally wound at both ends [conductor portion indicated by 4b in FIG. 2]
The part of is a part that does not contribute much to the generation of torque.
Here, in the case of this motor 13 ', the field magnet 3 is held in the end cap 2'by the field magnet positioning protrusion 15 of the end cap 2',
According to the positioning of the field magnet 3 as described above, one end of the field magnet 3 is extended to one end of the cylindrical coreless armature 4 even to a portion of the conductor portion that does not significantly contribute to the generation of the obliquely wound torque. Since a long one must be used, there is a drawback that it becomes an expensive field magnet 3.

In the case of the motor 13 ', the field magnet 3 is held on the end cap 2'by the field magnet positioning protrusion 15 of the end cap 2', but the field magnet 3 is positioned in this way. If fixed, the field magnet 3 cannot be held firmly and the outer diameter is 3 m.
Even if an attempt is made to form a cup-shaped coreless vibration motor having a small outer diameter such as m or 4 mm, the gap length between the field magnet 3 and the coreless armature 4 and the gap between the coreless armature 4 and the cylindrical motor housing 1 Since the length is very small, around 0.2 mm, the field magnet 3 and the coreless armature 4 or the coreless armature 4 may be affected by generated vibration or the like.
The cylindrical motor housing 1 and the cylindrical motor housing 1 come into contact with each other, resulting in damage to the motor.

That is, an object of the present invention is to reduce the number of parts to be assembled so that a small cup-shaped coreless motor having an outer diameter of 3 mm or 4 mm can be easily and inexpensively manufactured, and the magnetic flux of the field magnet can be reduced. Use a stator yoke so that it can be sufficiently closed so that there is almost no leakage magnetic flux from one end of the cup-shaped coreless motor, so that the adverse effect of the leakage magnetic flux on the outside is prevented. In addition to improving the current characteristics, even in the case of a small cup type coreless motor having an outer diameter of 3 mm or 4 mm, the motor efficiency is improved and it can be sufficiently used for vibration generation of a pager or the like. By using only one metal bearing, the troublesome concentric alignment of two metal bearings is omitted, the number of parts is reduced, and the structure is simplified. The coreless motor can be manufactured easily and inexpensively, the runout of the shaft can be sufficiently suppressed, the shaft does not give excessive lateral pressure to the metal bearing, and the noise characteristics and the life are improved. The characteristics are improved, the shaft is not bent, the positioning of the field magnet is facilitated, and the field magnet is firmly fixed so that there is no shaking, and damage to the motor is prevented. Planning,
The purpose is to make it possible to use a field magnet having a short length and to make it inexpensive.

[0015]

The object of the present invention is as follows.
A cylindrical type motor housing 1 made of a magnetic material is used as a cup-shaped coreless motor in which one end opening is closed by a hollow end cap made of a magnetic material, and one end opening of the cylindrical motor housing 1 of the motor is made. The hollow end cap attached to the
This can be achieved by configuring the hollow end cap, the metal bearing holder and the stator yoke to have all the functions.

More specifically, the hollow end cap 2 described above.
The outer peripheral portion of the end cap portion 2a is attached to one end opening portion of the cylindrical motor housing 1. A cylindrical bearing holder portion 2c is integrally formed at the central portion of the end cap portion 2a of the hollow end cap 2 so as to project toward the other end portion and have a metal bearing housing portion 2b on the inner peripheral portion and one end portion of which is opened. . Further, a cylindrical shape made of a magnetic material is formed at the other end of the bearing holder portion 2c with an outer diameter smaller than the outer diameter of the bearing holder portion 2c, and has a shaft through hole 2d penetrating in the axial direction at the center. The stator yoke portion 2e is integrally formed.

The field magnet 3 having N-pole and S-pole magnetic poles along the circumferential direction is positioned by positioning the one end of the field magnet 3 by the other end of the bearing holder 2b. -Fixed to the outer peripheral portion of the concave portion 2e. As a result, a radial gap 5 is formed between the outer periphery of the field magnet 3 and the motor housing 1 for interposing the cylindrical coreless armature 4.

From the one end opening of the bearing holder portion 2c, the metal bearing 6 having a shaft through hole 6a penetrating in the axial direction at the center is inserted into the metal bearing housing portion 2b of the bearing holder portion 2c. A shaft 9 having a commutator hub 8 provided with a commutator 7 fixed to the other end is connected to the shaft through hole 2d,
It is rotatably supported by a metal bearing 6 through 6a. The inner circumference of the other end of the cylindrical coreless armature 4 is fixed to the outer circumference of the commutator hub 8, and the cylindrical coreless armature 4 is fixed to the radial gap 5 between the field magnet 3 and the cylindrical motor housing 1. It is rotatably supported inside. A brush base 11 holding a brush 10 which is in sliding contact with the commutator 7 is attached to the other end of the cylindrical motor housing 1. The object of the present invention can be achieved by providing the cup-shaped coreless motor having the above structure.

[0019]

Function: End cap portion 2a of hollow end cap 2
A cylindrical bearing holder portion 2c is integrally formed at the central portion of the cylindrical bearing holder portion 2c, which projects toward one end portion and has a metal bearing accommodating portion 2b in the inner peripheral portion and one end portion of which is opened. Further, the bearing holder portion 2c
A cylindrical stator yoke portion 2e made of a magnetic material and having a shaft through hole 2d penetrating in the axial direction at the center, formed at the other end of the bearing holder 2c with an outer diameter smaller than that of the bearing holder 2c. Are integrally formed. By mounting the hollow end cap 2 formed as described above on one end of the motor housing 1, the hollow end cap 2 serves as an end cap, a metal bearing holder, and a stator yoke.
Furthermore, it can function as a field magnet positioning member.

One end of the field magnet 3 having a length of 5.95 mm is positioned by the other end of the bearing holder 2b having a length of 2 mm, and the field magnet 3 is moved to a station having a length of 5.95 mm. It is fixed to the outer circumference of the take-up portion 2e. The bearing holder portion 2b is formed to have a diameter larger than the outer diameter of the stator yoke portion 2e, and the bearing holder portion 2b forms a step at one end of the stator yoke portion 2e. The position of the one end of the magnet 3 can be easily positioned. In addition, a stator yoke portion 2e having a long axial length is provided.
Since the field magnet 3 is fixed to the outer periphery of the field magnet 3, the field magnet 3 can be firmly positioned and fixed at a predetermined position, the swing of the field magnet 3 is reduced, and the field magnet 3 is fixed.
It is possible to prevent a contact failure between the coreless armature 4 and the cylindrical coreless armature 4.

The outer peripheral portion of the end cap portion 2a of the hollow end cap 2 having the field magnet 3 fixed to the outer periphery of the stator yoke portion 2e is attached to one end opening of the cylindrical motor housing 1. Since the hollow end cap 2 is made of a magnetic material, it is possible to prevent the leakage magnetic flux from being generated by the field magnet 3 from one end of the cup-shaped coreless vibration motor 13.

Since the hollow end cap 2 is provided with the only metal bearing 6 in the bearing holder portion 2b formed to be relatively long in the axial direction, the metal bearing 6 rotatably supports the shaft 9. However, even if only one metal bearing 6 is formed, it is formed to be relatively long in the axial direction, so that the runout of the shaft 9 can be suppressed to a small level.
Since only one shaft bearing hole 6a of the metal bearing 6 needs to be passed through, the manufacturing becomes relatively easy in mass production.

The bearing holder portion 2b is extended in the axial direction to a position facing the portion of the conductor portion 4b which does not contribute much to the torque generation of the cylindrical coreless armature 4 in order to reduce the deflection of the shaft 9. Since it is formed, it is not necessary to use the field magnet 3 having a sufficiently long axial length up to the portion facing the conductor portion 4b, that is, it is possible to use the inexpensive field magnet 3 which is short in the axial direction. it can.

[0024]

【Example】

[First Embodiment] Referring to FIGS. 1 and 2, a first embodiment of the present invention will be described.
A cup type coreless vibration motor 13 using a cup type coreless motor as an example will be described below.

Like the motor 13 ', the motor 13 also has a cylindrical coreless armature 4, a commutator hub 8, a commutator 7 composed of commutator pieces formed on the commutator hub 8, and a commutator hub 8.
Shaft 9 fixed to the commutator hub 8 through the center of
It has a rotor consisting of. Cylindrical motor housing 1
Is formed into a cylindrical shape with an outer diameter of 4 mm and an inner diameter of 3.6 mm, which is open at both ends and has a length of 12.5 mm. A hollow end cap 2 fitted with a metal bearing 6 to be described later is fixed to one end opening of the motor housing 1 by means of press fitting or the like, and brushes 10-1 and 10 to be described later to the other end opening of the motor housing 1. The motor main body 12 is formed by fixing the brush base 11 made of resin with -2 attached thereto by means such as press fitting.

The brush base 11 has a pair of brush holding protrusions 18-1 and 18-2 integrally formed on the outer peripheral portion of the inner surface thereof, and a pair of brush holding protrusions 18-1 and 18-2 is provided on each of the pair of brush holding protrusions 18-1 and 18-2. 10-1 and 10-2 are mounted, and the brushes 10-1 and 10-2 are brought into sliding contact with a commutator 7 including a commutator piece group described later. One brush 10-1 is electrically connected to a positive power supply terminal not shown by a lead wire 14-1, and the other brush 10-2 is negative power supply not shown by a lead wire 14-2. Electrically connect to terminals.

The hollow end cap 2 is made of a magnetic material in order to close the magnetic flux of the field magnet 3 and to prevent the leakage magnetic flux generated by the field magnet 3 from leaking out from one end of the motor 13. Form. The hollow end cap 2 forms an end cap portion 2a by integrally forming an annular flange on an upper portion of a cup-shaped bearing holder portion 2c described later. A step is provided on the outer peripheral portion of the end cap portion 2a so that it can be fixed to the opening at one end of the motor housing 1 by means such as press fitting. It is press-fitted and the hollow end cap 2 is attached to one end opening of the cylindrical motor housing 1.

A cylinder having an opening at the center of the end cap portion 2a of the hollow end cap 2 with one end having a metal bearing accommodating portion 2b projecting toward the other end [downward in FIG. 1] and having an inner peripheral portion. The bearing holder portion 2c having a substantially rectangular shape is integrally formed. Further, a cylinder having a shaft through hole 2d penetrating in the axial direction at the center thereof, which is formed at the other end [lower end in FIG. 1] of the bearing holder 2c to have an outer diameter smaller than that of the bearing holder 2c. The shaped stator yoke portion 2e is integrally formed.

A two-pole cylindrical field magnet 3 having magnetic poles of N pole and S pole is inserted along the circumferential direction on the outer peripheral portion of the stator yoke portion 2e, and an adhesive or the like is used. Fix it. In this case, the bearing holder portion 2c is a stator yo-yo.
Since it is formed to have a larger diameter than the outer diameter of the tapered portion 2e,
Since the step portion formed by the bearing holder portion 2c is formed on the tee portion 2e, one end portion of the field magnet 3 is positioned by the step portion formed by the bearing holder portion 2b, and the staked portion is formed. The field magnet 3 is inserted and fixed to the outer peripheral portion of 2e. Therefore, the field magnet 3
A radial gap 5 for forming the cylindrical coreless armature 4 is formed between the outer periphery of the cylindrical motor housing 1 and the inner peripheral surface of the cylindrical motor housing 1. Since the field magnet 3 is positioned and fixed to the bearing holder portion 2b on the outer peripheral portion of the long stator yoke portion 2e, the field magnet 3 can be firmly held.

As described above, when one end of the field magnet 3 is positioned by the step formed by the bearing holder 2b,
The bearing holder portion 2b projects toward the other end and extends long to a position facing the portion of the conductor portion 4b in which one end of the cylindrical coreless armature 4 is diagonally wound and does not contribute much to torque generation. Therefore, when the cylindrical coreless armature 4 is rotatably supported as will be described later, the field magnet 3 includes all the conductor portion 4b that does not contribute much to the torque generation of the cylindrical coreless armature 4. It is possible to use a short length instead of a length opposite to. That is, an inexpensive field magnet 3 having a short length can be used. In the case of the cylindrical coreless armature 4, the central conductor portion 4a extending straight in the axial direction parallel to the magnetic pole boundary portion between the N pole and the S pole of the field magnet 3 serves as a conductor portion that contributes to torque generation. Has become.

Bearing holder portion 2c of the hollow end cap 2
The metal bearing 6 is inserted and fixed in the inside from one end of the motor 13 by means such as press fitting. The bearing metal 6 is made of copper and penetrates in the axial direction around a shaft through hole 6a having the same inner diameter as that of the shaft 9 having an outer diameter of 0.6 mm.

A shaft in which the inner circumference of the other end of the cylindrical coreless armature 4 is fixed to the outer circumference of the commutator hub 8 by means such as adhesion, and penetrates the center of the commutator hub 8 and is fixed to the commutator hub 8. An annular liner 19 in which 9 is formed by Lumirer or the like
Shaft through hole 19a, shaft through hole 2d of stator yoke portion 2e, and shaft through hole 6d of metal bearing 6
It is made to project from one end surface of the motor 13 through the inside. By supporting the shaft 9 rotatably by the metal bearing 6, the rotor is rotatably supported, and the cylindrical coreless armature 4 is interposed between the field magnet 3 and the cylindrical motor housing 1. It is rotatably supported in the radial gap 5.
The liner 19 is interposed between the other end surface of the field magnet 3 and one end surface of the commutator hub 8 to reduce friction between them and allow the rotor to rotate smoothly.

The brush base 11 is attached to the opening of the other end of the motor housing 1 by means such as press fitting, and the brushes 10-1 and 10-2 attached to the brush base 11 are brought into sliding contact with the commutator 7.

An annular retainer boss 20 formed by Lumirer or the like is press-fitted into one end of a shaft 9 protruding from one end of the metal bearing 6 so that the rotor is directed toward one end of the motor 13. Try not to get out. Insert one end of the shaft 9 further protruding from the retaining boss 20 into the shaft through hole 16a of the eccentricity counter 16 formed of high ratio heavy alloy such as tungsten alloy and use an adhesive or caulking the eccentricity counter 16. Then, the eccentricity counter 16 is fixed to one end of the shaft 9.

[0031]

[Second Embodiment] FIG. 3 is a vertical cross-sectional view of a cup-shaped coreless vibration motor 13-1 using a cup-shaped coreless motor as a second embodiment of the present invention. Since they have the same structure, the same parts are designated by the same reference numerals, and only different parts will be described.

Although the motor 13 has an outer diameter of 4 mm, the field magnet 3 used for such a motor is shown.
Has a small outer diameter of about 3 mm. It is difficult to machine the field magnet 3 because it is difficult to machine the field magnet 3 having a small outer diameter in the direction of the central axis of the field magnet 3 so that the through-hole for allowing the stator yoke portion 2e to pass therethrough is formed. In addition to being expensive, the field magnet 3 may be damaged and quality control of the field magnet 3 becomes difficult. In this case, when the field magnet 3 has a very short length, it becomes extremely easy to open a through hole for passing the stator yoke portion 2e, and the above problems are eliminated.

Therefore, in this motor 13-1, the field magnet 3 is formed by annular field magnet segments 3A, ..., 3D having a short axial length, and the field magnet segment 3A is formed.・ ・ ・ ・ ・ ・ 3D starter
It is laminated and fixed on the outer periphery of the curved portion 2e.

[0034]

[Third Embodiment] A cup-shaped coreless vibration motor 13-2 with a terminal using a cup-shaped coreless motor according to a third embodiment of the present invention will be described below with reference to FIG.

This coreless vibration motor 13-2 is formed by a thin piece having good electrical conductivity which is electrically connected to the brush 10-2 and a negative power source terminal (not shown) in the coreless vibration motor 13 described above. The terminal 21-2 is insulated through the brush base 11 and pulled out to the outside of the cylindrical motor housing 1 and bent at right angles to electrically connect to the brush 10-1 and a positive power supply terminal (not shown). The terminal 21-1 formed of a thin piece having good electrical conductivity to be connected is insulated through the brush base 11 and guided to the cylindrical motor housing 1.
The terminal 21-1 and the cylindrical motor housing 1 are electrically connected by means such as ultrasonic welding means. Cylindrical mode
The inner peripheral surface of the housing 1 is preliminarily plated with good electrical conductivity. One end of the cylindrical motor housing 1 is extended and bent at a right angle to the outside of the motor housing 1 and is used as a terminal 21-3 for electrically connecting to a positive power supply terminal (not shown). ing. In this case, the terminal 21-
3, the motor housing 1 is not extended and bent, and a terminal formed of a thin piece having good electric conductivity is separately provided, and one end of this terminal is ultrasonically welded to one end of the motor housing 1. It may be attached by means such as the above and electrically connected to the motor housing 1. At the center through hole of the brush base 11 attached to the other end of the cylindrical motor housing 1, the terminal 21-
A closing lid 22 made of a resin is attached so that the other end surface of the cylindrical motor housing 1 having 2 is a surface having a uniform thickness.

Since the terminals 21-3 and 21-2 are formed extending in the direction perpendicular to the cylindrical motor housing 1, the terminal piece 21-3 electrically connected to the positive power supply terminal is provided at one end and the other end is provided at the other end. A cup-shaped coreless vibration motor 13-2 with a terminal having a terminal 21-2 electrically connected to the negative power source terminal can be provided. For this reason, terminals 21-3 and 21-2 are
Through the through hole formed in the circuit board of the jar and soldering the terminals 21-3 and 21-2 to the printed wiring pattern on the surface of the board by soldering on the surface opposite to the circuit board. The cup-shaped coreless vibration motor 13-2 electrically connected to the circuit board surface of the jar can be fixed.

[0037]

[Fourth Embodiment] A cup-shaped coreless vibration motor 13-3 with an eccentric counter protection cap using a cup-shaped coreless motor according to a fourth embodiment of the present invention will be described below with reference to FIG. .

Like the coreless vibration motor 13-2, the coreless vibration motor 13-1 is a thin piece having good electrical conductivity which is electrically connected to the brush 10-2 and a negative power source terminal (not shown). The formed terminal 21-2 is insulated through the brush base 11 and is drawn out of the cylindrical motor housing 1 to extend toward the other end to form a brush 10-1 and a positive power supply terminal (not shown). A terminal 21-1 formed of a thin piece having good electrical conductivity to be electrically connected is guided through the brush base 11 to the cylindrical motor housing 1 and is guided to the cylindrical motor housing 1 by ultrasonic welding means or the like. -1 and the cylindrical motor housing 1 are electrically connected.

A cup-type eccentric counter protection cap 2 is formed by cutting the outer periphery of one end of a cylindrical motor housing 1 to form a small radius and forming an electrically conductive material in that portion.
By fixing the opening of the other end of 3 by means such as ultrasonic welding means, the eccentricity counter 16 is housed and protected in the eccentricity counter protection cap 23, and the cylindrical motor housing 1 and the eccentricity counter protection cap 23 are protected. And are electrically connected. By fixing the electrically conductive terminal 21-3 to one end of the eccentricity counter protection cap 23 by means such as ultrasonic welding means, a part of the terminal 21-3 is lengthened at one end of the eccentricity counter protection cap 25. Extend it toward the hand,
The brush 10-1, the terminal 21-1 electrically connected to the positive power supply terminal, the cylindrical motor housing 1, the eccentric counter protection cap 23, and the terminal 21-3 are electrically connected. It is more preferable to plate the outer periphery of one end portion of the cylindrical motor housing 1 whose outer periphery is cut off with good electrical conductivity.

The terminals 21-3 and 21-2 having such a shape
Then, the cup-shaped coreless vibration motor 13-3 is embedded in the through hole formed in the circuit board of the pager, and the terminals 21-3, 21- are formed in the printed wiring pattern on the surface of the circuit board.
2 can be soldered to fix the cup-shaped coreless vibration motor 13-3 electrically connected to the circuit board surface of the pager.

[0040]

According to the cup type coreless motor of the present invention, a hollow end cap made of a magnetic material, which is the same as the hollow end cap, stator yoke, bearing holder, and field magnet positioning member, is used. Since only one metal bearing is required and the number of parts is small as a whole, a small cup-shaped coreless motor having an outer diameter of 3 mm or 4 mm can be easily and inexpensively manufactured.

Since the hollow end cap is formed integrally with the stator yoke, the magnetic flux of the field magnet can be sufficiently closed and the outer diameter is 3 mm or 4 m.
Even in the case of a small cup type coreless motor such as m,
The motor efficiency and current efficiency can be improved, and a device that can be sufficiently used for vibration generation of a pager can be configured. In addition, since there is almost no leakage flux from one end of the cup-shaped coreless motor, the leakage flux does not adversely affect the outside.

The hollow end cap is formed integrally with the bearing holder. According to this bearing holder, it is only necessary to mount the metal bearing in the one bearing holder, and the runout of the shaft can be sufficiently suppressed by the metal bearing. Since it is possible to use only one metal bearing, it is possible to omit the troublesome concentric alignment of two metal bearings, reduce the number of parts, simplify the structure, and easily and inexpensively manufacture a cup-shaped coreless motor. it can.

Since the shaft does not apply excessive lateral pressure to the metal bearing and the shaft does not bend, it is possible to obtain a cup type coreless motor with improved noise characteristics and life characteristics.

Further, the field magnet can be easily positioned, the field magnet can be firmly fixed so that the field magnet does not sway, and the damage of the motor can be prevented, and the length is short. A field magnet can be used, and there is an advantage that it can be constructed at low cost.

In the case of a cup type coreless vibration motor with an eccentric counter protection cap, the above effect is further added, and a good performance can be obtained.
It is possible to almost eliminate the bad external influence due to the magnetic flux leaking from one end. Moreover, by using the eccentric counter protection cap as a terminal, a cup-type coreless vibration motor with an eccentric counter protection cap can be easily constructed, which is extremely desirable in mass production of pagers.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a cup-shaped coreless vibration motor to which a cup-shaped coreless motor according to a first embodiment of the present invention is applied.

FIG. 2 is an exploded perspective view of the coreless vibration motor.

FIG. 3 is a longitudinal sectional view of a cup-shaped coreless vibration motor to which the cup-shaped coreless motor according to the second embodiment of the present invention is applied.

FIG. 4 is a vertical cross-sectional view of a cup type coreless vibration motor with a terminal to which a cup type coreless motor according to a third embodiment of the present invention is applied.

FIG. 5 is a vertical cross-sectional view of a cup type coreless vibration motor with an eccentric counter protection cap to which a cup type coreless motor according to a fourth embodiment of the present invention is applied.

FIG. 6 is a longitudinal sectional view of a cup-shaped coreless vibration motor to which a conventional cup-shaped coreless motor is applied.

[Explanation of symbols]

1 Cylindrical motor housing 2, 2'Hollow end cap 2a End cap part 2b Metal bearing housing part 2c Bearing holder part 2d Shaft through hole 2e Steader yoke part 3 Field magnet 3A, ..., 3D field Magnetic magnet segment 4 Cylindrical coreless armature 4a Conductor part that contributes to torque generation 4b Conductor part that does not contribute to torque generation 5 Radial gap 6,6'-1,6'-2 Metal bearing 7 Commutator 8 Commutator hub 9 Shaft 10, 10-1, 10-2 Brush 11, 11 'Brush base 12, 12' Motor body 13, 13-1, 13 'Cup type coreless vibration motor 13-2 Terminal type cup type coreless vibration motor -Ter 13-3 Cup type coreless vibration motor with eccentric counter protection cap 14, 14-1, 14-2 Lead wire 15 Field magnet positioning protrusion 16 Eccentricity Counter 16a Shaft Through Hole 17 Radial Gap 18-1, 18-2 Brush Holding Protrusion 19 Liner 19a Shaft Through Hole 20 Detachment Boss 21-1, ..., 21-3 Terminal 22 Closing Lid 23 Eccentricity Counter 23 Protective cap

Claims (1)

[Claims] 1. A cup comprising the following components in which a cylindrical motor housing (1) made of a magnetic material has one end opening closed by a hollow end cap (2) made of a magnetic material. Shaped coreless motor. The outer peripheral portion of the end cap portion (2a) of the hollow end cap (2) is attached to one end opening portion of the cylindrical motor housing (1). Cylindrical bearing holder with one end opened at the center of the end cap portion (2a) of the hollow end cap (2) and having a metal bearing storage portion (2b) at the inner peripheral portion projecting toward the other end. The part (2c) is integrally formed. The other end of the bearing holder (2c) is made of a magnetic material having a shaft through hole (2d) penetrating in the axial direction at the center, which is formed with an outer diameter smaller than the outer diameter of the bearing holder (2c). The cylindrical stator yoke portion (2e) is integrally formed. A field magnet (3) having N-pole and S-pole magnetic poles along the circumferential direction is arranged by positioning one end of the field magnet (3) by the other end of the bearing holder part (2b). It is fixed to the outer periphery of the stator yoke portion (2e), and the outer periphery of the field magnet (3) and the motor housing (1).
Forming a radial gap (5) for interposing a cylindrical coreless armature (4) therebetween. A metal bearing (6) having a shaft through hole (6a) penetrating in the axial direction at the center in the metal bearing housing part (2b) of the bearing holder part (2c) from the one end opening of the bearing holder part (2c). Being inserted. A shaft (9) having a commutator hub (8) provided with a commutator (7) fixed to the other end is provided with the shaft through hole (2d,
It is rotatably supported by a metal bearing (6) through 6a). The inner circumference of the other end of the cylindrical coreless armature (4) is fixed to the outer circumference of the commutator hub (8), and the cylindrical coreless armature (4) is connected to the field magnet (3) and the cylindrical motor. It is rotatably supported in the radial gap (5) between the housings (1). A brush stand (11) holding a brush (10) in sliding contact with the commutator (7) is attached to the other end of the cylindrical motor housing (1).