JPH07284259A - Cup coreless motor - Google Patents

Abstract

PURPOSE:To make fluxes form closed loops sufficiently and eliminate a leakage flux by a method wherein a field magnet is fixed to the outer circumferential part of a stator yoke part which is the magnet attaching part of a cylindrical magnetic metal bearing which has a shaft through-hole piercing through its in an axial direction. CONSTITUTION:One of the end parts of a field magnet 3 is positioned and fixed to the outer circumference of the stator yoke part 2a of a cylindrical metal bearing 2 by the swollen part 2b of the metal bearing 2. The swollen part 2b is pushed into the inner diameter part of the metal-fitting-push-in protruding part 1a of a cylindrical motor housing 1 and fixed so as to make the bearing 2, the magnet 3 and the housing 1 unified. A radial gap 6 in which a cylindrical coreless armature 5 is provided is formed between the inner circumference of the housing 1 and the outer circumference of the magnet 3. A commutator hub 8 in which commutators 7 are provided is fixed to one of the ends of a shaft 9 and the shaft 9 is inserted into the shaft through-hole of the bearing 2 and the armature 5 is supported by the bearing 2 so as to rotate freely in the gap 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a cup type coreless motor.
Regarding data 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 12 'using this conventionally used cup type coreless motor will be described below with reference to FIG.

The motor 12 'passes through the center of the cylindrical coreless armature 5, the commutator hub 8, the commutator 7 composed of a group of commutator pieces formed on the commutator hub 8, and the center of the commutator hub 8. The rotor has a shaft 9 fixed to the commutator hub 8. Cylindrical motor housing 1'made of magnetic material
Attach a cap 13 made of resin to one end of the
Attach a brush stand 11 'that doubles as a cap to the other end
Forming a main body 14 '. The brush 10 is mounted on the brush base 11 ′, and the brush 10 is brought into sliding contact with the commutator 7. The brushes 10 are composed of a pair, one brush 10 is electrically connected to a positive power supply terminal not shown by a lead wire 16, and the other brush 10 is negative power supply terminal not shown by a lead wire 16. Electrically connect to.

A cylindrical field magnet positioning protrusion 15 having a small diameter is integrally formed on the inner surface of the cap 13, and one end of the cylindrical field magnet 3 is fixed to the outer periphery thereof to cap the field magnet 3. Fix at 13. The cap 13 has a shaft through hole at the center thereof, and the shaft 9 of the rotor is passed through the field magnet 3 so that the cap 1
Copper bearing 2'-1 provided in the shaft through hole of 3
And, the other end of the field magnet 3 is rotatably supported by a copper-based metal bearing 2'-2 provided on the inner circumference. An eccentric counter 17 for generating vibration is attached to the shaft 9 protruding from one end of the motor body 14 '.

[0007]

According to such a motor 12 ', since there is a radial gap 18 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 cap 13 is made of resin and is made of non-metal, and the metal bearings 2'-1 and 2'-2 are made of copper-based non-magnetic material, the magnetic field magnet 3 is made of magnetic material. The passage could not be closed, and a leakage magnetic flux was generated from one end of the motor 12 ', resulting in poor motor characteristics.

If the motor 12 'is approached there and an outer diameter of 3-4 mm is to be formed, the field magnet 3 also has a thin outer diameter due to the limitation of the space. There is no choice but to make it small, and the magnetic flux of the field magnet 3 is inevitably weakened, worsening the motor characteristics, and
It is not possible to construct something that can withstand use for generating vibrations such as jas. The leakage flux of the field magnet 3 is
In the case of a certain type of pager, it causes an erroneous signal in a certain frequency band and is very disliked, and a leakage flux countermeasure is required.

The motor 12 'has an outer diameter of 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 2'-1 and 2'-2.
It is designed to pass through the shaft through hole. However, if the concentricity of the shaft through holes of the two separated metal bearings 2'-1 and 2'-2 is not accurately obtained, the shaft through holes of the two metal bearings 2'-1 and 2'-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 2'-1, 2'-2
The relative lateral pressure of the was increased, adversely affecting the life characteristics and noise characteristics.

The eccentric counter 17 rotates while partially eccentric to generate vibrations, but two short metal bearings 2'-1 with a long distance apart from each other as in the motor 12 '.
Even if the shaft 9 is supported by 2 and 2'-2, with such a structure, the deflection of the shaft 9 cannot be sufficiently suppressed. For this reason, the shaft 9 exerts an excessive lateral pressure on the metal bearing 2'-1 or 2'-2 to deteriorate noise characteristics and life characteristics, and the cylindrical coreless armature 5 causes the field magnet 3 or the motor housing 1 to be damaged. ', The cylindrical coreless armature 5 is broken, the motor is damaged, and the shaft 9 having a very small outer diameter is bent, so that the eccentricity counter 17 moves inside the pager. It has a drawback in that it collides with a substrate or the like and generates a large amount of noise, or the motor 12 'cannot be driven.

Also, in the case of this motor 12 ', a cylindrical coreless armature wound in a hexagonal shape [see FIG. 2] 5 is used in consideration of the ease of manufacture and the good motor efficiency. There are many. In the case of this cylindrical coreless armature 5, the portions of the conductor portions [conductor portions 5b shown in FIG. 2] wound diagonally on both ends are portions that do not contribute much to the generation of torque. Here, in the case of this motor 12 ', the field magnet 3 is held in the cap 13 by the field magnet positioning protrusion 15 of the cap 13, but according to such positioning of the field magnet 3, It is necessary to use the one in which one end of the field magnet 3 is formed long to the portion of the conductor of the cylindrical coreless armature 5 that does not contribute much to the generation of the obliquely wound torque, which is expensive. There is a defect that the field magnet 3 is used.

In the case of the motor 12 ', the cap 1
Although the field magnet 3 is held by the cap 13 by the field magnet positioning protrusion 15 of 3, the field magnet 3 cannot be firmly held and the outer diameter is Even if an attempt is made to form a cup-shaped coreless vibration motor having a small outer diameter of 3 mm or 4 mm, the gap length between the field magnet 3 and the coreless armature 5 and between the coreless armature 5 and the cylindrical motor housing 1 '. Since the air gap length is very narrow, around 0.2 mm, the field magnet 3 and the coreless armature 5 or the coreless armature 5 and the cylindrical motor housing 1 ′ come into contact with each other due to generated vibration or the like. There is a drawback that damages the motor.

That is, the object of the present invention is to improve the current characteristics by making it possible to close the magnetic flux of the field magnet sufficiently so that there is almost no leakage magnetic flux from one end of the cup-shaped coreless motor. And the outer diameter is 3 mm
Even in the case of a small cup type coreless motor of 4 mm or 4 mm, the motor efficiency is high, and it can be used sufficiently for vibration generation of a pager or the like.
By using one magnetic metal bearing at the same time, the concentric alignment of the two metal bearings is omitted, the cap 13 is also omitted, the number of parts is reduced, the structure is simplified, and the cup-type coreless motor is easily manufactured. In addition, it should be possible to perform it at low cost, to prevent the shaft from swinging sufficiently, to prevent the shaft from exerting excessive lateral pressure on the metal bearing, and to improve noise characteristics and life characteristics.
Preventing the shaft from bending, facilitating the positioning of the field magnet, and fixing the field magnet so that it does not sway to prevent damage to the motor. The purpose is to make it possible to use a field magnet with a short length and to make it inexpensive.

[0014]

The object of the present invention is as follows.
It can be achieved by the following means. A stator yoke portion 2 serving as a magnet mounting portion of a cylindrical magnetic metal bearing 2 having a shaft through hole 4 axially penetrating therethrough in the center thereof.
A two-pole field magnet 3 having N-pole and S-pole magnetic poles is fixed to the outer peripheral portion of a along the circumferential direction. Metal bearing 2 above
One end of the field magnet 3 is extended and projected from the one end of the field magnet 3, and the one end of the field magnet 3 is positioned by the enlarged portion 2b formed larger than the outer diameter of the stator yoke portion 2a. The leakage magnetic flux of the field magnet 3 is attracted to the outer peripheral side surface of the enlarged portion 2b. A cylindrical motor housing 1 made of a magnetic material is formed by projecting one end in the inner circumferential direction and forming a metal shaft bearing press-fitting protrusion 1a having an inner diameter substantially matching the outer diameter of the enlarged portion 2b. . The axial length of the metal shaft bearing press-fitting protrusion 1a is made sufficiently longer than the thickness of the cylindrical motor housing 1, and the axial length of the enlarged portion 2b is the starter yo-yo. -It is formed to be sufficiently longer than the thickness of the concave portion 2a and to be equal to or longer than the axial length of the metal bearing press-fitting protrusion 1a. Enlarged part 2 of the above metal bearing 2
b is press-fitted into the inner diameter portion of the metal shaft bearing press-fitting projection 1a to fix the metal shaft bearing 2 to the cylindrical motor housing 1, so that the magnetic path of the field magnet 3 becomes the outer peripheral side surface of the enlarged portion 2b. And the cylindrical motor housing 1 via the metal shaft bearing press-fitting protrusion 1a and the cylindrical motor housing 1 is closed.
A radial gap 6 is formed between the outer housing 1 and the field magnet 3 to allow the cylindrical coreless armature 5 to intervene. A shaft 9 having a commutator hub 8 provided with a commutator 7 fixed to the other end is passed through the shaft through hole 4 and rotatably supported by a metal bearing 2. The inner circumference of the other end of the cylindrical coreless armature 5 is fixed to the outer circumference of the commutator hub 8,
The cylindrical coreless armature 5 is rotatably supported in the radial gap 6 between the field magnet 3 and the cylindrical motor housing 1. 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.

[0015]

Function: One end of the field magnet 3 is positioned by the enlarged portion 2b of the cylindrical metal bearing 2 and the field magnet 3 is fixed to the outer circumference of the stator yoke portion 2a of the metal bearing 2. The enlarged portion 2b of the metal bearing 2 is press-fitted and fixed to the inner diameter of the projection 1a for press-fitting the metal bearing of the cylindrical motor housing 1, and the metal bearing 2, the field magnet 3 and the cylindrical motor are fixed.
The motor housing 1 is integrated, and a radial gap 6 for interposing a cylindrical coreless armature 5 is formed between the inner circumference of the cylindrical motor housing 1 and the outer circumference of the field magnet 3. A shaft 9 having a commutator hub 8 provided with a commutator 7 fixed to the other end is passed through a shaft through hole 4 of a metal bearing 2 so that a cylindrical coreless armature 5 is rotatably metal in the radial gap 6. Bearing 2 is used. Metal bearing 2
Is formed by one having a long axial length, and since the enlarged portion 2b is also formed by a long axial length, the shaft through hole 4 of the metal bearing 2 is provided with a shaft. 9
The shaft 9 can be easily passed, and the shake of the shaft 9 can be suppressed to a small level.

As described above, the shaft 9 makes the enlarged portion 2b of the metal bearing 2 form a part of the motor housing 1 and the cap 13 can be omitted, and one metal bearing is provided. As a result, the cap can be eliminated, the number of parts can be reduced, the configuration can be simplified, and the cup-type coreless motor can be mass-produced at low cost. Further, the metal bearing 2 is a magnetic metal bearing, and since the enlarged portion 2b of the metal bearing 2 and the metal bearing press-fitting protrusion 1a of the cylindrical motor housing 1 are also formed to be long in the axial direction, The leakage magnetic flux of the magnetic magnet 3 can be attracted to the cylindrical motor housing 1 via the outer peripheral side surface of the enlarged portion 2b and the side surface of the metal shaft bearing press-fitting projection 1a, and the magnetic field at one end of the field magnet 3 can be magnetized. Since the path can be closed, the magnetic flux of the field magnet 3 is prevented from leaking outside from one end of the cup-shaped coreless motors 12, 12-1, 12-2, 12-3. Therefore, the motor efficiency can be increased.

The enlarged portion 2b is formed so as to extend in the axial direction to a position facing the portion of the conductor portion 5b that does not contribute much to the torque generation of the cylindrical coreless armature 5 in order to reduce the deflection of the shaft 9. Therefore, it is not necessary to form the field magnet 3 having a sufficiently long axial length up to the portion facing the conductor portion 5b, that is, the inexpensive field magnet 3 that is short in the axial direction can be used. Further, since the field magnet 3 can be firmly positioned and fixed at a predetermined position, it is possible to prevent the contact failure between the field magnet 3 and the cylindrical coreless armature 5.

Further, one end of the eccentric counter protection caps 25, 25-1 made of an electrically conductive material is fixed to the outer periphery of one end of the cylindrical motor housing 1, and the eccentric counter 17 is housed therein. A terminal 16'-2 such as a lead wire for protecting and electrically connecting to the brush 10-2 is insulated through the brush base 11 and is also drawn out of the cylindrical motor housing 1 to provide one power supply terminal. And a terminal 16'- such as a lead wire electrically connected to the brush 10-1.
1 is insulated through the brush base 11 and is electrically connected to the cylindrical motor housing 1, and the cylindrical motor housing 1 and the eccentric counter protection caps 25 and 2 are connected.
By electrically connecting the eccentricity counter protection caps 25 and 25-1 as the other power supply terminal by electrically connecting to the 5-1, a cup-shaped coreless vibration motor 12-1 with an eccentricity counter protection cap with a terminal, 12-2 and 12-3 can be easily formed.

[0019]

【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 12 using a cup type coreless motor as an example will be described below.

Like the motor 12 ', this motor 12 also has a cylindrical coreless armature 5, 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. A cylindrical motor housing 1 made of an electrically conductive magnetic material and having an outer diameter of 4 mm is formed of a metal having an inner diameter substantially equal to the outer diameter of a thickened portion 2b, which is formed by projecting one end in the inner circumferential direction. The shaft bearing press-fitting projection 1a is integrally formed to have a thickness of 0.6 mm. The axial length of the metal shaft bearing press-fitting protrusion 1a is 1.5 mm. That is, the axial length of the metal shaft bearing press-fitting projection 1a is made sufficiently longer than the thickness of the cylindrical motor housing 1.

A brush base 11 made of resin is mounted on the opening of the other end of the cylindrical motor housing 1, and a motor main body 14 is formed together with a metal bearing 2 which will be described later. A pair of brush holding protrusions 19 are provided on the outer peripheral portion of the inner surface of the brush base 11.
-1, 19-2 are integrally formed, and the pair of brush holding protrusions 19-1, 19-2 are respectively provided with a pair of brushes 10-1,
10-2 is attached, and the brushes 10-1 and 10-2 are brought into sliding contact with the commutator 7 composed of a commutator piece group. One brush 1
0-1 is electrically connected to a positive power supply terminal not shown by a lead wire 16-1, and the other brush 10-2 is electrically connected to a negative power supply terminal not shown by a lead wire 16-2. Connect to each other.

The metal bearing 2 formed of a cylindrical magnetic system, for example, an iron system, has a shaft through hole 4 formed at the center thereof and penetrating in the axial direction. The shaft through hole 4 is the shaft 9
It has an inner diameter that is substantially the same as the outer diameter. The metal bearing 2 has N-pole and S-pole magnetic poles along the circumferential direction on the outer peripheral portion of the stator yoke portion 2a having a small diameter which is about the same as the axial length of the field magnet 3. The two-pole cylindrical field magnet 3 provided with is inserted and fixed using an adhesive or the like.

The metal bearing 2 has one end portion extended and projected from one end portion of the field magnet 3 to form an enlarged portion 2b formed larger than the outer diameter of the stator yoke portion 2a. -A step is formed on the ridge 2a,
The one end portion of the field magnet 3 is positioned by the step due to b, and the field magnet 3 is inserted and fixed to the outer peripheral portion of the stator yoke portion 2a. The outer diameter of the enlarged portion 2b is formed to have a size substantially equal to the inner diameter of the metal shaft bearing press-fitting protrusion 1a. Therefore, by inserting and fixing the field magnet 3 on the outer peripheral portion of the stator yoke portion 2a until it is positioned in the enlarged portion 2b, the outer diameter of the field magnet 3 and the outer diameter of the enlarged portion 2b are substantially equal to each other. The length of the radial gap 6 between the outer circumference of the field magnet 3 and the metal bearing 2 with the field magnet (including the enlarged portion 2b) and the inner peripheral surface of the cylindrical motor housing 1 becomes equal. Can be constant.

As described above, the thickness of the enlarged portion 2b is made sufficiently thicker than the thickness of the starter yoke portion 2a, but the axial length of the enlarged portion 2b is also the metal shaft bearing press-fitting projection. The length is equal to or longer than the axial length of the portion 1a. In this embodiment, the axial length of the enlarged portion 2b is made sufficiently longer than the axial length of the metal shaft bearing press-fitting projection 1a to sufficiently suppress the runout of the shaft 9.

The metal shaft bearing 2 is fixed to the cylindrical motor housing 1 by press-fitting the enlarged portion 2b of the metal shaft bearing 2 into the inner diameter portion of the metal shaft bearing press-fitting projection 1a of the cylindrical motor housing 1. Then, a radial gap 6 for interposing the cylindrical coreless armature 5 is formed between the inner circumference of the cylindrical motor housing 1 and the outer circumference of the field magnet 3.

The length of the enlarged portion 2b in the axial direction is the same as the portion of the conductor portion 5b at which one end of the cylindrical coreless armature 5 is wound around the enlarged portion 2b and the conductor portion 5b does not contribute much to the generation of torque. It is formed so as to extend to the opposite position. Therefore,
When the cylindrical coreless armature 5 is rotatably supported as will be described later, the field magnet 3 has a length facing the whole portion of the conductor portion 5b that does not contribute much to the torque generation of the cylindrical coreless armature 5. It is possible to use the short one instead of the short one. That is, an inexpensive field magnet 3 having a short length can be used. In the case of the cylindrical coreless armature 5, the central conductor portion 5a 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.

A ring-shaped retainer boss 20 formed by Lumirer or the like is press-fitted onto a shaft 9 having a commutator hub 8 provided with the above-mentioned commutator 7 fixed to the other end thereof and fixed to the other end surface of the commutator hub 8. Then, an annular liner-21 formed of Lumirer or the like is passed therethrough to smooth the sliding between the one end surface of the field magnet 3 and the retaining boss 20.

A shaft in which the inner circumference of the other end of the cylindrical coreless armature 5 is fixed to the outer circumference of the commutator hub 8 by means such as bonding, and penetrates the center of the commutator hub 8 and is fixed to the commutator hub 8. 9 is passed through the shaft through hole 4 of the metal bearing 2 to rotatably support the rotor by the metal bearing 2, so that the cylindrical coreless armature 5 is coupled to the field magnet 3 and the cylindrical motor housing. It is rotatably supported in the radial gap 6 between the two.

As shown in FIG. 2, the bearing metal 2 has bearing portions 2c-1 and 2c-2 which are in contact with the shaft 9 by slightly projecting the inner peripheries of both opening portions thereof to the inner side. Bearing part 2 rather than the inner diameter between parts 2c-1 and 2c-2
The inner diameters of c-1 and c-2 are made slightly smaller.

After passing through the shaft through hole 4 of the metal bearing 2 and passing an annular liner 22 made of Lumirer or the like at one end of the shaft 9 protruding from one end of the bearing metal 2, further, A ring-shaped retainer boss 23 formed of Lumirer or the like is press-fitted to prevent the rotor from coming out toward one end of the motor 12, and the retainer boss 23 is inserted into the shaft passage hole 24 of the eccentric counter 17. Further, one end of the shaft 9 protruding further is inserted and fixed. The eccentricity counter 17 is fixed to one end of the shaft 9 by using an adhesive or by swaging the eccentricity counter 17.

[0031]

[Second Embodiment] A cup-shaped coreless vibration motor 12-1 with an eccentric counter protection cap using a cup-shaped coreless motor according to a second embodiment of the present invention will be described below with reference to FIG. .

The coreless vibration motor 12-1 is formed of a thin piece having good electric conductivity which is electrically connected to the brush 10-2 and a negative power source terminal (not shown) in the coreless vibration motor 12. Terminal 16'-2 (or lead wire 16)
-2 may be used) to be insulated through the brush base 11 and pulled out to the outside of the cylindrical motor housing 1 and bent and extended at a right angle to the brush 10-1 and a positive power supply (not shown). A terminal 16'-1 (or a lead wire 16-1 may be used) formed of a thin piece having good electrical conductivity for electrically connecting to the terminal is passed through the brush base 11 for insulation, and a cylindrical model is also used. -Lead to the motor housing 1 and electrically connect the terminal 16'-1 and the cylindrical motor housing 1 by means such as ultrasonic welding. In the central through hole of the brush base 11 attached to the other end of the cylindrical motor housing 1,
A closing lid 29 made of resin is attached so that the other end surface of the cylindrical motor housing 1 having the terminals 16'-2 becomes a surface having a uniform thickness.

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 5 by means such as ultrasonic welding means, the eccentricity counter 17 is housed and protected in the eccentricity counter protection cap 25, and the cylindrical motor housing 1 and the eccentricity counter protection cap 25 are secured. And are electrically connected. By fixing the electrically conductive terminal 26 to one end portion of the eccentricity counter protection cap 25 by ultrasonic welding means or the like, a part of the terminal 26 is eccentricity counter protection cap 2
5, a brush 10-1, and a terminal 16'-1 for electrically connecting to the positive power supply terminal, which is extended and protruded to the outside of the radius, and a cylindrical motor.
The electrical housing 1, the eccentric counter protection cap 25, and the terminal 26 are electrically connected.

Since the terminals 16'-2 and 26 are formed to extend in the direction perpendicular to the cylindrical motor housing 1, one end 2 is electrically connected to the positive power supply terminal at one end as shown in FIG.
6, a terminal 16 'electrically connected to the negative power supply terminal at the other end
The cup-shaped coreless vibration motor 12-1 with an eccentric counter protection cap having a terminal piece having a -2 can be provided. For this reason, the terminals 16'-2 and 26 are passed through the through holes formed in the substrate 27 of the pager, and the printed wiring pattern on the surface of the substrate 27 is soldered on the surface opposite to the substrate 27 by the solder 30.
The cup-shaped coreless vibration motor 12-1 electrically connected to the surface of the substrate 27 of the pager can be fixed by soldering the terminals 26, 16'-2 to the connector.

[0035]

[Third Embodiment] A cup type coreless vibration motor 12-2 with an eccentric counter protection cap using a cup type coreless motor as a third embodiment of the present invention shown in FIG. "-2" are terminals 26 'and 16 "-2 formed by extending the longitudinal direction of the cylindrical motor housing 1. With the terminals 26 'and 16''-2 having such a shape, as shown in FIG. 6, the cup-shaped coreless vibration motor 12-2 is embedded in the through hole formed in the substrate 27 of the pager, and A cup type coreless vibration motor 12-2 in which the terminals 26 'and 16''-2 are soldered to a printed wiring pattern on the surface of the board 27 and electrically connected to the surface of the board 27 of the pager. Can be fixed.

[0036]

[Fourth Embodiment] A cup-type coreless vibration motor 12 with an eccentric counter protection cap using a cup-type coreless motor according to a fourth embodiment of the present invention shown in FIGS.
3 is a cylindrical eccentric counter protection cap 25 in which a through hole 28 such as a slit is formed in the side surface instead of the eccentric counter protection cap 25 of the coreless vibration motor 12-1.
-1 is used. According to such an eccentricity counter protection cap 25-1, the conductive metal strip is rounded into a cylindrical shape, and the length of the conductive metal strip is set so that the slit-shaped through hole 28 can be formed between both ends thereof. Aunt, very easily and inexpensively, eccentric counter protection cap 2
5-1 can be formed. It is possible to confirm the detachment and operation of the eccentricity counter 17 from the shaft 9 from the outside through the through hole 28. Reference numeral 26 ″ is a terminal in which one end of the eccentric counter protection cap 25-1 is formed to extend toward one end in order to form a terminal similar to the terminal 26 ′.

[0037]

[Effect] According to the metal bearing of the cup-shaped coreless motor of the present invention, the magnetic flux of the field magnet can be sufficiently closed, so that the leakage magnetic flux from one end of the cup-shaped coreless motor can be almost eliminated. By closing the magnetic flux of the field magnet, the current characteristics can be improved and the outer diameter is 3m.
Even in the case of a small cup type coreless motor such as m or 4 mm, the motor efficiency can be improved and it can be sufficiently used for generating vibration of a pager or the like.

According to the cup type coreless motor of the present invention, since there is only one metal bearing, insertion of the shaft is extremely easy. Moreover, since the metal bearing can sufficiently suppress the runout of the shaft, the shaft does not exert excessive lateral pressure on the metal bearing, the noise characteristic and the life characteristic are improved, and the shaft is not bent, so that the radial direction is improved. 3mm with a structure in which the length of the void is only one sheet of thin paper
Even with a cup-shaped coreless motor having a small outer diameter of 4 mm, a highly reliable one can be easily manufactured. Further, according to the metal bearing of the present invention, it is possible to easily position the field magnet, firmly fix the field magnet, and use an inexpensive field magnet having a short length.

In the case of a cup type coreless vibration motor with an eccentric counter protection cap, the above-mentioned effect is further added, and a good performance can be obtained, and the motor
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 an exploded perspective 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 a vertical sectional view of the coreless vibration motor.

FIG. 3 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 second embodiment of the present invention is applied.

FIG. 4 is an explanatory diagram of a case where the cup-shaped coreless vibration motor with an eccentric counter protection cap is attached to a substrate of a pager.

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 third embodiment of the present invention is applied.

FIG. 6 is an explanatory view of a case where the cup-shaped coreless vibration motor with an eccentric counter protection cap is attached to a substrate of a pager.

FIG. 7 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 third embodiment of the present invention is applied.

FIG. 8 is a plan view of the cup-shaped coreless vibration motor.

FIG. 9 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]

1,1 'Cylindrical motor housing 1a Metal shaft bearing press-fitting protrusion 2,2'-1,2'-2 Metal shaft bearing 2a Steader yoke part 2b Enlarged part 2c-1,2c-2 Bearing part 3 Field magnet 4 Shaft through hole 5 Cylindrical coreless armature 5a Conductor part 5b contributing to torque generation 5b Conductor part not contributing to torque generation 6 Radial gap 7 Commutator 8, 8'Commutator hub 9 Shaft 10, 10-1 , 10-2 Brush 11, 11 'Brush stand 12, 12' Cup type coreless vibration motor 12-1, 12-2, 12-3 Cup type coreless vibration motor with eccentric counter protection cap 13 Cap 14, 14 'Motor main body 15 Field magnet positioning protrusion 16-1, 16-2 Lead wire 16'-1, 16'-2, 16''-2 Terminal 17 Eccentricity counter 18 Radial air gap 19-1, 1 -2 brush holding protrusion 20 retaining boss 21 liner - 23 retaining boss 24 shaft through hole 25,25-1 eccentric counter protective cap 26, 26 ', 26''terminals 27 substrate 28 through hole 29 closed lid 30 solder

Claims (1)

[Claims] 1. A cup-shaped coreless motor comprising the following components. Shaft through hole (4) that penetrates the center in the axial direction
A two-pole field having magnetic poles of N-pole and S-pole along the circumferential direction on the outer peripheral portion of the stator yoke portion (2a) serving as the magnet mounting portion of the cylindrical magnetic metal bearing (2) having The magnet (3) is fixed. An enlarged portion (2b) formed by making one end of the metal bearing (2) extend and protrude from one end of the field magnet (3) and formed to be larger than the outer diameter of the stator yoke portion (2a).
The one end portion of the field magnet (3) is positioned by means of and the leakage magnetic flux of the field magnet (3) is attracted to the outer peripheral side surface portion of the enlarged portion (2b). One end is formed so as to project inward, and the enlarged portion (2
Provided is a cylindrical motor housing (1) made of a magnetic material and having a metal shaft bearing press-fitting projection (1a) having an inner diameter substantially matching the outer diameter of (b). The axial length of the metal shaft bearing press-fitting protrusion (1a) is made sufficiently longer than the thickness of the cylindrical motor housing (1), and the axial length of the enlarged portion (2b). The length is formed to be sufficiently longer than the thickness of the stator yoke portion (2a), and is equal to or longer than the axial length of the metal shaft bearing press-fitting protrusion portion (1a). Doing things. The metal bearing (2) is fixed to the cylindrical motor housing (1) by press-fitting the enlarged portion (2b) of the metal bearing (2) into the inner diameter portion of the protrusion (1a) for press-fitting the metal bearing. Then, the magnetic path of the field magnet (3) is connected to the outer peripheral side surface of the enlarged portion (2b) and the metal shaft bearing press-fitting protrusion (1
It is closed by the cylindrical motor housing (1) via a), and the cylindrical coreless armature (5) is interposed between the cylindrical motor housing (1) and the outer circumference of the field magnet (3). Forming a radial void (6) for A shaft (9) having a commutator hub (8) provided with a commutator (7) fixed to the other end is passed through the shaft through hole (4) and is rotatably supported by a metal bearing (2). thing. The inner circumference of the other end of the cylindrical coreless armature (5) is fixed to the outer circumference of the commutator hub (8), and the cylindrical coreless armature (5) is connected to the field magnet (3) and the cylindrical motor. It is rotatably supported in the radial gap (6) 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).