Motor having resin-made motor base from which bottom face a...

Details Motor having resin-made motor base from which bottom face a... Motor having resin-made motor base from which bottom face a...

2000-09-28

2002-10-15

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S06700R

Reexamination Certificate

active

06465919

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a micro-motor and a device to which the motor is mounted. More particularly, the present invention relates to a motor having a resin-made motor base from which bottom face a metal terminal exposes its lower face, so that the motor can be soldered directly to a device board by re-flow soldering.
BACKGROUND ART
The Japanese Patent Application Non-Examined Publication No. H-10-127031 discloses a technique of improving the productivity of motor. This prior art addresses a brushless motor of an outer-rotor type motor. A metal wiring terminal plate is insert-molded in the motor-base so that the plate is buried in the motor-base. This insert-molding makes the following coupling job with ease, i.e. a first end of terminal plate protrudes as a riser over a stator winding from an upper end of the motor-base, and a winding's terminal is coupled to the riser.
When the motor-base is manufactured by insert-molding the metal wiring terminal plate, the assembling of the motor becomes easier; however, it takes time to supply the plate into a mold, and the time for resin molding increases in general. Further, one mold cannot accommodate numbers of cavities. This method thus yields less numbers of moldings per unit time than a simple resin molding method. As a result, this method incurs an increase of molding cost.
Recently, a motor has been mounted to a device board by re-flow soldering in order to improve the productivity of the device. Because such a motor measures so small that it is effective from the view of assembling efficiency to bury motor-terminals in the motor-base by insert-molding. However, since the problems discussed above are not favorable to the insert-molding, a structure of motor with good workability as well as productivity, and yet, without using the insert-molding has been demanded.
SUMMARY OF THE INVENTION
The present invention addresses the problems discussed above and aims to provide a motor of which motor base can be mounted with motor-terminals without using an insert-molding, and the motor allowing high productivity. More particularly, the present invention aims to provide a structure of the motor measuring so small to be soldered directly to a device board by re-flow soldering.
The motor of the present invention comprises the following elements:
(a) a rotor;
(b) a stator facing to the rotor; and
(c) a motor-base-assembly for journaling the rotor as well as holding the stator; this assembly including:
(c-1) a motor-base made of resin and having openings;
(c-2) terminals made of metal and mated with the motor-base by being inserted from the openings, and exposing a lower face thereof from a bottom face of the motor-base.
This structure allows the motor-terminals to be mounted to the motorbase without using the insert-molding, and also allows high productivity. The motor of this structure can be soldered directly to the device board by re-flow soldering, thereby improving productivity as well as reliability of the device.
The device according to the present invention comprises the following elements:
(a) a motor;
(b) a board on which the motor is mounted; and
(c) a driver for driving the motor,
where the motor includes the following elements:
(a-1) a rotor;
(a-2) a stator facing to the rotor; and
(a-3) a motor-base-assembly for journaling the rotor as well as
holding the stator; this assembly including:
(a-3-1) a motor-base made of resin and having openings;
(a-3-2) terminals made of metal and mated with the motor-base by being inserted from the opening, and exposing a lower face thereof from a bottom face of the motor-base.
This structure allows the device of the present invention to be soldered with the motor terminals to its board directly by re-flow soldering. As a result, the device of high productivity as well as high reliability is obtainable.


REFERENCES:
patent: 4836792 (1989-06-01), Glover
patent: 4969829 (1990-11-01), Sato
patent: 5668423 (1997-09-01), You et al.
patent: 6097121 (2000-08-01), Oku
patent: 6305976 (2001-10-01), Tsuji et al.
patent: 0 511 876 (1992-04-01), None
patent: 0 539 094 (1992-10-01), None
patent: 5-103451 (1993-04-01), None
patent: 10127031 (1998-05-01), None
patent: WO99/41020 (1999-08-01), None

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