JP3305241B2 - Small motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small motor,
Pager, it relates to an optimum small motors as a small vibration motor used as a vibration generating source such as a mobile phone.

[0002]

2. Description of the Related Art Hitherto, a so-called small DC motor having a brush and a commutator has been used as a vibration source for silent calling of a pager, a cellular phone or the like. This small vibration motor is disclosed, for example, in Japanese Utility Model Laid-Open Publication No. 7-16573. This small vibration motor is shown in FIG. As shown in FIG. 9, in this type of small vibration motor 30, a weight portion 33 is attached to a rotating shaft 32 protruding from a motor main body 31 in an eccentric state.
By rotating 3, vibration (vibration) is generated. Also, two lead wires 3
4 protrudes from the motor main body 31, and when the small vibration motor 30 is incorporated in an embedded device, the small vibration motor 3
The lead wire 34 of No. 0 was manually positioned at the connection portion of the embedded device, and the lead wire 34 was connected by soldering. Then, through these lead wires 34, the motor body 31
Powering.

The structure of a commutator for a small vibration motor of this type is disclosed in Japanese Patent Application Laid-Open No. 7-39115. FIG. 10 schematically shows a commutator of such a small vibration motor. As shown in FIG. 10, the coil tap 41 whose coating has been removed in advance is disposed on a riser 43 provided at an end of the commutator 42, and the coil tap of the rotor is provided with two electrodes 44 and 45 for spot welding. 41 and the riser 43 of the commutator 42 are energized, and a spot welding between the riser 43 and the coil tap 41 is performed by using Joule heat generated at that time.
2 are electrically connected to each other.

[0004] As a method of removing the coating of the coil tap 41, a so-called dip method in which the coating is melted by placing it in a solder bath, or a method of dissolving the coating using a solvent is employed.

[0005]

In such a small vibration motor, it is desired that the size of the built-in device, such as a pager or a mobile phone, into which the small vibration motor is built be reduced further. . In addition, in order to reduce the cost of the embedded device, not only the cost of the small vibration motor itself, which is one of its components, is reduced, but also the work of attaching the small vibration motor to the embedded device is simplified, There is also a demand for a small-sized vibration motor that can reduce the number of man-hours for mounting a motor in a maker that performs the above-mentioned steps, and can achieve cost reduction by reducing the number of steps.

[0009] However, as shown in FIG. 9, when power is supplied to the motor main body 31 through the lead wire 34, the positioning and soldering of the lead wire 34 must be performed manually, which increases the man-hour for mounting the small motor. It took a lot of trouble and time.

Further, according to the commutator structure of the conventional small vibration motor as shown in FIG. 10, in order to spot-weld the coil tap 41 and the riser 43 of the commutator 42, the coil tap 41 is required as a separate step in advance. In this case, the step of removing the insulating coating is necessary, and in this case also, the number of steps for mounting the small motor increases. Further, when the insulating coating is removed by solder, there is a problem that the core wire becomes thin and thin and easily broken due to the copper being eroded by the solder. Further, if the insulating coating was removed with a solvent, there was a risk that the solvent would cause environmental destruction.

[0008] The present invention is intended to solve the above problems, by a Turkey to reduce motor mounting man-hours in manufacturer assembling the small motor, capable of simplifying the electrical connection to the embedded system for a small motor an object of the present invention is to provide a small motor.

[0009]

In order to solve this problem, the present invention provides a stator having a frame, a bearing, and a magnet, a shaft rotatably supported inside the stator, and a shaft. A rotor having a fixed commutator and a coil electrically connected to the commutator, a terminal plate having a pair of brushes in contact with the commutator, and an external terminal electrically connected to the brush; And a bracket assembly fixed to the stator side, comprising a pair of energizing terminals for power supply protruding to the energizing terminal, and a bracket and holder made of an insulating material for supporting the energizing terminal or a component to which the energizing terminal is fixed. , The current-carrying terminal is a leaf spring having a certain length.
The bracket and the holder of a bracket assembly
Between the terminal plate and the current-carrying terminal.
And the current-carrying terminal are electrically connected, and the bracket is
With the current assembly attached to the frame
The child is configured to be substantially parallel to the shaft .

According to this small motor, the man-hour for mounting the small motor on the manufacturer side can be reduced.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION
A small motor in which a shaft is driven to rotate with respect to a frame, wherein a plate-shaped energizing terminal having a fixed length is provided on the frame so as to be substantially parallel to the shaft.

According to this small-sized motor, the small-sized motor is arranged such that the current-carrying terminal formed in the shape of a spring plate comes into contact with the connection point to the current-carrying terminal of the assembling device incorporating the motor. The electrical connection with the mounting device can be made to supply power to the small vibration motor, eliminating the need for the positioning of the motor lead wires and the soldering of the lead wires, which were conventionally required by the manufacturer to assemble the small motor. Therefore, the number of man-hours for mounting the motor can be reduced .

[0013] Also, as the small motor, is fixed eccentric weight for vibration generating shaft, it is also suitable small vibration motor vibration is generated by rotation of the shaft. Following <br/> under embodiments of the present invention will be described with reference to FIGS.

Embodiment 1 FIGS. 1 and 2 are a side view and a bottom view, respectively, of a small vibration motor according to Embodiment 1 of the present invention. (A), (b), and (a) and (b) of FIG. 4 are an exploded front view, an exploded side view, an assembly front view, and an assembly side view of a bracket assembly of the small vibration motor (coreless motor). .

The small vibration motor 1 has a stator in which a substantially cylindrical metal bearing and a substantially cylindrical magnet are mounted in a substantially cup-shaped frame 2 (see FIG. 1) made of a magnetic material. A rotor comprising a shaft 3 (see FIG. 2) rotatably supported inside the stator, a commutator fixed to the shaft 3, and a coil electrically connected to the commutator; As shown in FIG. 4, an eccentric weight 4 for vibration generation fixed to the shaft 2, a pair of brushes 5 contacting the commutator, a terminal plate 6 electrically and physically connected to the brush 5, and a power supply And a bracket assembly 10 including a bracket 8 and a holder 9 made of an insulating material such as nylon. 1 and 2
1, the bracket assembly 10 is disposed at the open end of the frame 1.

As shown in FIGS. 3A and 3B, the bracket 8 has a pair of positioning pins 8a projecting therefrom.
The positioning pins 8 are provided on the holder 9 and the terminal plate 6.
a are formed in the holder 9.
The terminal plate 6 is positioned by positioning pins 8a. The brush 5 and the terminal plate 6 are sandwiched and fixed between the bracket 8 and the holder 9.

Each of the pair of energizing terminals 7 is formed of a leaf spring. The energizing terminals 7 are sandwiched between the bracket 8 and the terminal plate 6, and are further connected by means such as caulking or spot welding. It is electrically and mechanically connected to the plate 6. As shown in FIG. 2, the pair of conducting terminals 7
The surfaces along the longitudinal direction and the thickness direction are projected side by side in parallel so as to face each other.

FIGS. 5 and 6 are views showing an image when the small vibration motor is set and mounted on a board on the side of the embedded device. As shown in FIGS. 5 and 6, the board 1 on the embedded device side
By contacting the power supply terminal 12 provided in 1 with the power supply terminal 7 on the small vibration motor side, power can be supplied to the small vibration motor 1 from the embedded device side.

Further, in the above embodiment, the brush 5 and the terminal plate 6 are shown as being integrated. However, the present invention is not limited to this, and the brush 5 and the terminal plate 6 are separately provided. the brush 5 and the terminal plate 6 by means such as spot welding or caulking, electrical and I be constructed by mechanically connecting <br/> Ikoto course. Further, the energizing terminal 7 does not necessarily need to be formed of a spring plate, and it is sufficient that at least a portion exposed to the outside is a spring plate shape. Further, it is desirable that the energizing terminal 7 be plated with gold in order to ensure the stability of contact with the power supply terminal on the side of the built-in device in which the small vibration motor 1 is incorporated.

Further, in this embodiment, the case of a coreless motor has been described, but it goes without saying that a cored motor may be similarly configured. As described above, according to this embodiment, the energizing terminal 7 that receives power supply from the embedded device is formed in a spring plate shape, so that when the small vibration motor 1 is incorporated in the embedded device, Is determined, the position of the power supply terminal is also determined, and power can be supplied to the small vibration motor 1. Therefore, it is possible to reduce the number of manual steps such as positioning of the lead wire and soldering of the lead wire as in the case of connecting with the lead wire.

Further, since the energizing terminal 7 is formed in a spring plate shape, even if the relative position between the small vibration motor 1 and the substrate 11 on the side of the built-in device changes within the dimensional error range at the time of manufacturing, this is not considered. The dimensional error maintains a good contact state due to the spring property of the current-carrying terminal 7. Similarly, even if the vibration generating eccentric weight 4 is rotated to generate vibration, the contact state is favorably maintained by the spring property of the conducting terminal 7.

(Embodiment 2) FIG. 7 is a bottom view of a small vibration motor according to Embodiment 2 of the present invention. The components having the same functions as those of the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted. As shown in FIG. 7, the difference between the small vibration motor 13 and the small vibration motor 1 according to the first embodiment is that the opposing surfaces of the small-size vibration motor 13 That is, the tapered surface 7a is provided so as to be further away from the side.

With such a configuration, even when the distance between the roots of the energizing terminals 7 is set to be small, the distal ends of the energizing terminals 7 are separated from each other, and when this small vibration motor 13 is mounted on an embedded device, The distal ends of the current-carrying terminals 7 formed of the leaf springs bend so as to be separated from each other, preventing the current-carrying terminals 7 from contacting each other, and improving reliability.

[0024] Third Embodiment FIG. 8 is a fragmentary cross-sectional view of the commutator and the portion of the coil of the small type vibration motor (coreless motor).

This small vibration motor also includes a stator, a rotor, a bracket assembly, and the like, as in the above-described embodiment, and the rotor is rotatably supported inside the stator. A commutator 22 fixed to the shaft, and a coil 23 electrically connected to the commutator 22 are provided (see FIG. 8). Then, a coil tap 24 as a connecting portion of the coil 23 covered with the insulating coating and a riser 25 as a connecting portion of the commutator 22 are connected by spot welding.

Reference numerals 26 and 27 denote spot welding electrodes. One of the electrodes 26 to be brought into contact with the coil tap 24 has a substantially U-shape so that the electrode 26 can be energized only. A small cross-sectional area portion 26a is formed in which a cross-sectional area of a portion to be brought into contact with 24 is made smaller than a cross-sectional area of other portions.

When connecting the coil tap 24 and the riser 25, a current is first applied between both ends 26b and 26c of the electrode 26 while the electrode 26 is in contact with the coil tap 24. As a result, the small cross-sectional area 26a having a high resistance value in the electrode 26 generates heat, and this heat destroys the insulating coating of the coil tap 24.

Next, one end 26c of the electrode 26 is opened, and the electrode 26 (the electrode 26) in contact with the coil tap 24 is opened.
Current flows between the end 26 b) of the commutator 22 and the electrode 27 that is in contact with the riser 25 of the commutator 22. Thus, the spot welding of the coil tap 24 and the riser 25 is performed as in the related art. At this time, it goes without saying that the open side of the electrode 26 may be the end 26c. Further, in order to further stabilize the welding, a metal having a relatively low melting point, such as tin, or a metal which is easily compatible with copper, such as silver, is plated or clad on the welded portion between the surface of the riser 25 and the coil tap 24. It is desirable to arrange by means.

According to the method of manufacturing a small vibration motor using this spot welding machine, the coil tap 24 and the commutator 22
In order to spot-weld the riser 25 of the coil tap, the insulating coating removal process of the coil tap, which was conventionally required as a separate process, was performed by a method of melting the coating with a solder bath or a method of melting the coating with a solvent. It becomes unnecessary. In addition, when the insulating coating is removed with solder, the conventional problem that the core wire becomes thin and easily broken due to the copper erosion by the solder is solved, and environmental destruction which has been a problem in recent years is caused. It also has the effect that it is not necessary to use potentially dangerous solvents.

In this case as well, a description has been given of a coreless motor as in the above embodiment, but it goes without saying that a cored motor may be used. Further, the above-described first to third embodiments may be individually adopted, but it goes without saying that these may be adopted together.

Further, in each of these embodiments, an example of a small vibration motor has been described, but the present invention is not limited to this, and it is needless to say that the present invention can be applied to other small motors.

[0032]

As described above, according to the present invention, the position of the energizing terminal is determined only by positioning the motor when the motor is mounted on the built-in device by forming the energizing terminal for electric power supply into a spring plate shape. Therefore, the man-hour for manipulating the lead wire, which could not be automated with the conventional motor with a lead wire and required a human hand, becomes unnecessary. In addition, since power is supplied to the motor by contact between the power supply terminal and the power supply terminal of the embedded device, there is no need to solder the spring plate-shaped power supply terminal, thereby reducing the number of soldering steps and improving production efficiency. Can be improved .

[Brief description of the drawings]

FIG. 1 is a side view of a small vibration motor according to a first embodiment of the present invention.

FIG. 2 is a bottom view of the small vibration motor according to the embodiment;

FIG. 3A is an exploded front view of a bracket assembly of the small vibration motor according to the embodiment; FIG. 3B is an exploded side view of the bracket assembly of the small vibration motor according to the embodiment;

FIG. 4A is a front view of assembling a bracket assembly of the small vibration motor according to the embodiment; FIG. 4B is a side view of assembling the bracket assembly of the small vibration motor according to the embodiment;

FIG. 5 is a front view showing a state before mounting the small vibration motor in the embodiment.

FIG. 6 is a front view showing a state after mounting the small vibration motor according to the embodiment;

FIG. 7 is a bottom view of the small vibration motor according to the second embodiment of the present invention.

8 fragmentary sectional view of a commutator and portion of the coil of the small type vibration motor of the present invention

FIG. 9 is a perspective view of a conventional small vibration motor.

FIG. 10 is a sectional view of a main part of a commutator and a coil of a conventional small vibration motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 13 Small vibration motor 2 Frame 3 Shaft 4 Eccentric weight for vibration generation 5 Brush 6 Terminal plate 7 Current terminal 7a Tapered surface 8 Bracket 9 Holder 10 Bracket assembly 11 Substrate 12 Power supply terminal 22 Commutator 23 Coil 24 Coil tap (coil 25 riser (commutator connection) 26, 27 electrode 26a small cross section

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroshi Adachi 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. (56) References JP-A-10-117460 (JP, A) JP-A-2000-299961 (JP, A) JP-A-2000-60058 (JP, A) JP-A-11-136327 (JP, A) JP-A-56-51460 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , (DB name) H02K 5/22 H02K 3/50 H02K 15/04

Claims (3)

(57) [Claims] 1. A fixed body having a frame, a bearing, and a magnet.
A stator and a shaft rotatably supported inside the stator and
The commutator fixed to the shaft and the commutator are electrically connected to the commutator.
A rotor having a connected coil, and a terminal plate on which a pair of brushes contacting the commutator are formed;
And a power supply electrically connected to the brush and protruding outside.
Supports a pair of current-carrying terminals and a component to which the current-carrying terminals or the current-carrying terminals are fixed
Bracket and holder made of insulating material
A bracket assembly fixed to the stator side,
The current-carrying terminal is in the form of a leaf spring having a fixed length,
The terminal plate is connected to the bracket and the holder of the assembly.
And the energizing terminal, and the brush and the energizing terminal
Are electrically connected and the bracket assembly is
The current-carrying terminal is configured to be substantially parallel to the shaft.
Small motors. 2. A pair of positioning pins are provided on the bracket.
The terminal board provided with the holder and the brush is
Forming a fitting hole for fitting to the positioning pin, the holder and the terminal plate are formed by the positioning pin.
The brush is attached to the bracket together with the terminal board.
2. The small motor according to claim 1, wherein the small motor is sandwiched and fixed between the holder and the holder . 3. An eccentric weight for generating vibration is fixed to the shaft, and vibration is generated by rotation of the shaft.
Or the small motor according to 2.