JP2001062395A - Flat type vibration motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat type vibration motor in which the manufacturing cost is reduced by providing only two armature coils and eliminating dead points for starting. SOLUTION: An annular starter 4 divided into eight equal sections in the peripheral direction and alternately magnetized to N poles and S poles and a rotor 5 of almost fan shape having its face facing the starter 4 and rotatable freely are disposed in a casing, and two armature coils 11 of the 60 deg. coil winding angle are provided at the 150 deg. disposing pitch on the rotor 5, and a non-magnetic weight member 21 is provided between two armature coils 11, and a commutator base 14 with twelve commutators provided in parallel with in the peripheral direction is fixed and a pair of brushes 12 are brought into contact with the above commutators 10 at the 135 deg. electric angle in a casing 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small flat vibration motor used for notifying an incoming call by vibration using a cellular phone, a pager (registered trademark) or the like.

[0002]

2. Description of the Related Art Conventionally, as a flat type vibration motor of this type, for example, a flat iron coreless vibration motor disclosed in Japanese Patent Application Laid-Open No. 6-205565 has been known. The flat iron coreless vibration motor includes a magnet section fixed to the bottom of the casing, a rotatable substantially fan-shaped rotor arranged to face the magnet section, and a main part of the rotor. The rotor is composed of three armature coils arranged in a fan shape and molded integrally with a resin material. It works so as to generate vibration, and is designed so that starting dead center does not occur by mounting three armature coils on the rotor.

[0003]

However, in the above-mentioned flat type vibration motor, torque is generated by the magnetic field with the magnet for the three coils in which the current flows alternately, so that at least three coils are used. Will be needed. This is because, when the rotor stops with an armature coil having a rotation angle of about 90 ° or less, no rotation force is generated in the armature coil positioned within the polarity of the magnet. It has not been possible to simply reduce the number of armature coils from a rotor having a number of armature coils.

An object of the present invention is to solve the above-mentioned problems, to reduce the manufacturing cost by using two armature coils, and to provide a flat type vibration motor having no starting dead center.

[0005]

In order to solve the above-mentioned problems, a flat type vibration motor according to the present invention is characterized by having the following requirements. (B) A ring-shaped stator is provided in a flat cylindrical casing, and the stator is circumferentially divided into eight equal parts and alternately magnetized to N poles and S poles. B) A substantially fan-shaped rotor is rotatably supported in the casing so as to face the stator and to be rotatable. Two armature coils having a coil winding angle of 60 ° are arranged on the rotor at an arrangement pitch of 150 °. And a non-magnetic weight member is disposed between the two armature coils. (C) The rotor is provided with a commutator substrate in which 12 commutators are juxtaposed in the circumferential direction. First, fourth,
The seventh and tenth commutators are first conductors, and second and
The fifth, eighth, and eleventh commutators are third conductors,
The third, sixth, ninth, and twelfth commutators are each short-circuited by a second conductor, and the first conductor has a first armature coil winding start, and the second conductor has a second conductor. The winding start of the armature coil is connected to the third conductor, and the winding ends of the first and second armature coils are connected to the third conductor. The brush shall be formed so as to contact the commutator at an electrical angle of 135 °.

[0006]

1 and 2 show an exploded perspective view and a longitudinal sectional view of a main part of a flat type vibration motor (hereinafter referred to as a motor) according to the present invention. A ring-shaped stator 4 and a substantially fan-shaped rotor 5 are provided inside a casing 3 having a flat cylindrical case 1 and a disc-shaped bracket 2 fitted into an opening at the lower end of the case 1. And are arranged.

The bracket 2 has a ring-shaped stator 4,
A commutator 10 described below provided on the lower surface of the rotor 5
And a pair of brushes 12a and 12b that contact the armature coil 11 and allow current to flow through the armature coil 11 are arranged.
b denotes a positive brush 12a and a negative brush 12a, which are soldered on a brush base 13 formed so that a lead wire (not shown) can be connected to a power source by soldering to a power supply.
b, as shown in FIG.
It is formed so as to contact the commutator 10 at 5 °.

The stator 4 is divided into eight equal parts in the circumferential direction, each of which is composed of eight stators 4a to 4h formed in a fan shape with an expansion of 45 °. Each stator has an N pole and an S pole. The two brushes 12a and 12b are alternately magnetized at the boundaries of the magnetic poles.
Is fixed on the bracket 2 by an appropriate means such as an adhesive so that the contact portions that come into contact with the commutator 10 coincide with each other.

The rotor 5 is provided at a main part of the rotor 5 as shown in the plan view, the bottom view and the sectional view taken along the line XX 'in FIGS. The first and second two armature coils 11 of a substantially fan-shaped flat plate having an expansion degree of 60 ° arranged at an arrangement pitch of 120 ° with the rotating shaft 16 interposed therebetween.
a, 11b and a non-magnetic metal plate disposed between the first armature coil 11a and the second armature coil 11b, and a flat weight member formed in a substantially fan shape with an expansion degree of 90 °. 21
The resin 1 is placed on a commutator substrate 14 having a substantially fan-shaped plate shape.
5 and are integrally formed.
As shown in FIG. 5, the commutator substrate 14 includes a metal 18 in which the rotating shaft 16 fits in an opening 17 formed in the center of the case 1 and a metal 18 fitting in an opening 19 formed in the center of the bracket 2. Face the stator 4 and are rotatably supported by the casing 3.

FIGS. 5A and 5B show the commutator substrate 14 before the first armature coil 11a, the second armature coil 11b, and the weight member 21 are fixed with the resin 15. FIG.
2 shows a plan view and a bottom view of the commutator substrate 14.
Are printed conductors 20a, 20b, and 20c, which are conductors for soldering the start and end of the first armature coil 11a and the second armature coil 11b, respectively.
Is formed, and the starting end of the first armature coil 11a is attached to the soldered portion 22 of the printed wiring 20a which is the first conductor.
The starting end of the second armature coil 11b is connected to the soldered portion 23 of the printed wiring 20b, which is the second conductor, and the end of the first armature coil 11a and the second armature coil 11b is connected to the third conductive member. Soldering part 24 of printed wiring 20c as a body
Are soldered respectively.

Further, as shown in FIG. 5 (b), commutators 10a to 10l
Are radially arranged, and commutators 10a, 10d, 1
0g and 10j are short-circuited to the printed wiring 20a through the through holes 30a to 30d, and the commutators 10c and 1j are short-circuited.
0f, 10i, and 10l are short-circuited to the printed wiring 20b through the through holes 31a to 31d.
Reference numerals 0b, 10e, 10h, and 10k are short-circuited by the ring-shaped printed wiring 32 and short-circuited to the printed wiring 20c through the through hole 33, and as shown in the bottom view of FIG. The commutators 10a to 10l formed on the back side of the commutator substrate 14 corresponding to the commutators 10a to 11l correspond to the commutators 10a to 11l.
10l and the armature coils 11a and 11b are shown in FIG.
Are connected as shown in FIG.

In FIG. 6A, reference numeral 35 denotes a resistor for preventing electric noise. FIG. 6B shows the rotor 5, the commutators 10a to 101, and the stators 4a to 4l.
h is a developed view showing the relative positions of the contacts a and b of the brushes 12a and 12b.

Next, with reference to FIGS. 7 to 9, the operation mode of the above-mentioned flat type vibration motor will be described, and the absence of the starting dead center will be described.

While a voltage is applied to the coil via the brush, a force acts on the coil in a fixed direction according to Fleming's law by the direction of the current flowing through the coil and the magnetic field of the stator. When the rotor rotates and no voltage is applied, no current flows through the coil, so that the rotor stops rotating without being affected by the force of the magnetic field of the stator, but the stop position is specified. Never.

FIG. 7 (a) shows the position when the rotor is at 0 °, and the electric current is the brush 12a → commutator 10h → armature coil 11b → commutator 10f → commutator 10
c → brush 12b flows in the direction of the arrow in the order, so that a rotating force of 2F is generated between the stator 4d, the stator 4e and the armature coil 11b in the directions of the arrows A and A ′ according to Fleming's left-hand rule, The rotor 5 can be started.

FIG. 7 (b) shows the position when the rotor is at 15 °, and the current is changed from the brush 12a to the commutator 10g.
-> Commutator 10d-> armature coil 11a-> commutator 10h-> commutator 10b-> flows in the direction of the arrow in the direction of the brush 12b. A rotation force of 2F is generated in the direction of ', and the rotor 5 can be started.

FIG. 7 (c) shows the position when the rotor is at 30 °, and the current is changed from the brush 12a to the commutator 10
f → armature coil 11b → commutator 10h → commutator 10b → brush 12b and commutator 10g
→ Since commutator 10d → armature coil 11a → commutator 10h → commutator 10b → brush 12b, current flows in the direction of the arrow, so that stator 4a, armature coil 11a and stator 4 are arranged according to Fleming's left hand rule.
f and the armature coil 11b in the directions of arrows C and C ′.
The rotation force of F is generated, and the rotor 5 can be started.

FIG. 7D shows the position when the rotor is at 45 °, and the current is changed from the brush 12 a to the commutator 10.
f → armature coil 11b → commutator 10h → commutator 10b → brush 12b flows in the direction of the arrow, so that arrows D, D are provided between the stator 4e, the stator 4f and the armature coil 11b according to Fleming's left-hand rule. A rotation force of 2F is generated in the direction of ', and the rotor 5 can be started.

Similarly, as shown in FIGS. 8 (a) to 8 (d), when the rotor is at 60 °, 75 °, 90 °, 105 °, FIG.
As shown in FIGS.
The rotor can be started in the same manner even at the positions of 5 °, 150 °, 165 °, and although not shown, the rotor can be operated at 165 ° to 165 °.
The rotor 5 can be started at any position of 360 °.

As described above, no matter what position the rotor 5 stops, the brushes 12a and 12b always contact the commutator 10, so that the current supplied through the brushes is affected by the magnetic field of the stator. Armature coils 11a, 11
b so that a force that always acts in one or both directions in the same direction is generated with a constant torque (2F) and selectively flows through one or both of the armature coils 11a and 11b. Even if the position is not restricted to a predetermined position, it is possible to realize a motor having no starting dead center.

FIGS. 7A to 7D and FIGS.
9 (d) and FIGS. 9 (a) to 9 (d) explain that the rotor can be started in any position, and show that the rotor continuously rotates in the same direction. During this time, a current flows in one or both of the armature coils 11a and 11b so that a constant torque (2F) is always generated in a fixed direction with respect to the stator 4, so that rotation can be continued.

FIGS. 10A to 10D show a case where the arrangement pitch of the armature coils 11a and 11b is set to 165 °. In the case of FIG. 10A, the armature coils 11b and the stator are arranged. 4d, a rotational force of F is generated in the direction of arrow V,
In the case of FIG. 10B, the armature coil 11a and the stator 4
a and 4b, a rotational force of 2F is generated in the directions of the arrows W and W ′. In the case of FIG. 10C, the armature coil 11a and the stator 4a, and the armature coil 11b and the stator 4e, 4f
10F, a rotational force of 3F is generated in the directions of arrows X, X ′, and X ″. In the case of FIG. 10D, the rotation of F in the direction of arrow Y occurs between the armature coil 11b and the stator 4e. A torque is generated, the rotational force is not stable at F to 3F, and there is a possibility that the motor cannot be started at the rotational force of F. The motor in which the arrangement pitch of the present invention is 150 ° always has the same rotational force (2F). Unlike this, it cannot be rotated with a stable torque.

[0023]

According to the present invention, even when the supply of voltage to the motor is stopped and the rotor is stopped, the brush is always in contact with the commutator, and the brush is always connected to the armature coil by the magnetic field of the stator. Since current can be passed through the armature coil so that forces acting in the same direction are generated with a constant torque, the stop position of the rotor is not restricted. The rotor can be reliably started and rotated in a certain direction. Further, since a large weight member is provided as a whole, a larger vibration can be generated while being small.

Further, by reducing the number of coils to two, it is possible to reduce the manufacturing cost, and it is necessary to perform special processing on the coil to specify the stop position of the rotor or to add a special part. Since there is no motor, the manufacturing process can be simplified and the product yield can be improved, and a motor with high production efficiency can be realized.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a flat type vibration motor according to the present invention.

FIG. 2 is a longitudinal sectional view of a main part of the flat type vibration motor.

FIG. 3 is a plan view of a brush.

FIGS. 4A to 4C are a plan view, a bottom view, and a cross-sectional view taken along line XX ′ in the plan view of the rotor.

5A and 5B are a plan view and a bottom view of a commutator substrate.

6 (a) and 6 (b) are schematic views of a motor connection showing a rotor connection diagram and relative positions of a rotor, a commutator, a stator, and brush contacts.

FIGS. 7A to 7D are operation explanatory diagrams showing the principle of rotation of the motor when the rotor is at 0 ° to 45 °.

FIGS. 8A to 8D are operation explanatory diagrams showing the principle of rotation of the motor when the rotor is at 60 ° to 105 °.

9 (a) to 9 (d) show the case where the rotor is 120 ° to 165 °.
Operation explanatory diagram showing the principle of rotation of the motor in FIG.

FIG. 10 is a diagram illustrating the operation of a motor in which the arrangement pitch of armature coils is set to 165 °.

[Explanation of symbols]

 Reference Signs List 3 casing 4 stator 5 rotor 10 commutator 11 armature coil 12 brush 14 commutator substrate 20a first conductor (printed wiring) 20b second conductor (printed wiring) 20c third conductor (printed wiring) 21 weight Element

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 23/58 H02K 23/58 Z F-term (Reference) 5D107 AA02 AA13 AA20 BB08 CC08 DD09 5H603 AA01 AA09 BB01 BB04 BB14 BB19 CA02 CA05 CB01 CC14 CC19 CD05 CD21 CE01 5H607 AA00 BB01 BB04 BB13 BB25 CC05 DD02 DD16 EE57 GG01 5H623 AA05 AA10 BB06 GG13 GG17 GG25 GG28 HH02 HH06 HH09 JJ01 JJ05 JJ06 JJ06

Claims (1)

[Claims] 1. A flat type vibration motor having the following requirements. (B) A ring-shaped stator is provided in a flat cylindrical casing, and the stator is circumferentially divided into eight equal parts and alternately magnetized to N poles and S poles. B) A substantially fan-shaped rotor is rotatably supported in the casing in such a manner as to face the stator and to be rotatable. The rotor includes two first and second rotors having a coil winding angle of 60 °. Armature coils are arranged at an arrangement pitch of 150 °, and a non-magnetic weight member is arranged between the two armature coils. (C) The rotor has 12 circumferential members. A commutator substrate provided with a plurality of commutators is provided, and first, fourth,
The seventh and tenth commutators are first conductors, and second and
The fifth, eighth, and eleventh commutators are third conductors,
The third, sixth, ninth, and twelfth commutators are each short-circuited by a second conductor, and the first conductor has a first armature coil winding start, and the second conductor has a second conductor. The winding start of the armature coil is connected to the third conductor, and the winding ends of the first and second armature coils are connected to the third conductor. The brush must be formed to contact the commutator at an electrical angle of 135 °