Stator for reciprocating motor

Details Stator for reciprocating motor Stator for reciprocating motor

2002-12-26

2004-05-25

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S256000, C310S256000

Reexamination Certificate

active

06741008

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a stator for a reciprocating motor, and particularly, to a stator for a reciprocating motor of which components can be fabricated in simple way.
BACKGROUND ART
Generally, a motor is a device for changing electric energy into kinetic energy, and can be classified into a rotary motor changing the electric energy into rotating movements and a reciprocating motor changing the electric energy into linear reciprocating movements.
The motor can be used in various fields as a power source. Especially, the above motor is applied to most electric devices such as refrigerator, air conditioner, etc.
In the refrigerator and the air conditioner, the motor is used to rotate a blast fan, however, it can be also used as a power source by being mounted on a compressor of cooling cycle device included in the refrigerator and the air conditioner.
FIGS. 1 and 2
are showing an example of a reciprocating motor under development by the present applicant. As shown therein, the reciprocating motor comprises: a bobbin
100
of ringular shape having a coil
110
wound therein; a terminal portion formed on one side of the bobbin
100
for electrically connecting the coil
110
wound in the bobbin
110
to outer electric source; an outer core
200
in which a plurality of lamination sheets
210
which are thin plates of U-shape are laminated in radial direction so as to make a cylindrical shape centering around the bobbin
100
; an inner core
300
, in which a plurality of lamination sheets
310
having predetermined area and length, and having asymmetric upper and lower parts centering around length direction are laminated in radial direction so as to make a cylinder shape, inserted into the outer core
200
; and an armature
400
inserted between the outer core
200
and the inner core
300
.
The outer core
200
and the inner core
300
including the bobbin
100
construct a stator (S).
On the other hand, the inner core
300
may be located on an outer side of the outer core
200
. That is, the bobbin
100
is located on the inner core
300
side, and the bobbin
100
may not be included in the outer core
200
.
The lamination sheets
210
constructing the outer core
200
are laminated so that the bobbin
100
can be inserted into opening recess (H) formed inside of the lamination sheet
210
. In addition, both ends of the lamination sheet
210
are pole portion
211
forming the poles, and remained part is path portion
212
on which flux flows.
The lamination sheet
310
constructing the inner core
300
is formed to have long portion facing the lamination sheet
210
of the outer core
200
, short opposite portion, and coupling recesses
311
with opened ends formed on both end portions of the lamination sheet.
The armature
400
comprises a magnet holder
410
of cylindrical shape and a plurality of permanent magnets
420
fixedly coupled on an outer circumferential surface of the magnet holder
410
.
In addition, as shown in
FIG. 3
, a laminated body (L) which is made by laminating the plurality of lamination sheets
310
in radial direction to make a cylinder shape is fixedly coupled by press-fitting a fixing ring
312
of ringular shape into a ring coupled recess
311
of ringular shape formed by a concave recess of the lamination sheets.
Unexplained reference numeral
220
represents a fixing ring of the outer core.
As shown in
FIG. 4
, when electric current is flowed on the winding coil
110
, a flux is formed around the winding coil
110
by the electric current flowing on the winding coil
110
, and the flux flows along with the outer core
200
and the inner core
300
as forming a closed loop.
The armature
400
is moved toward a center axis direction by an interaction between the flux caused by the current flowing on the winding coil
110
and the permanent magnet
420
constructing the armature
400
.
In addition, when the direction of electric current flowing on the winding coil
110
is changed, the direction of the flux formed on the outer core
200
and the inner core
300
, and the armature
400
moves toward opposite direction.
When the electric current is supplied as changing its direction, the armature
400
undergoes linear reciprocating movements between the outer core
200
and the inner core
300
. Accordingly, the armature
400
is to have linear reciprocating power.
On the other hand, since the outer core
200
and the inner core
300
making the stator (S) are constructed by the laminated body of the plurality of lamination sheets, the loss of flux flowing on the stator can be reduced.
However, according to the above conventional structure, when the stator (S) is fabricated, the lamination sheet
310
constructing the inner core
300
in the stator (S) is formed as an asymmetric shape for a center line in length direction, and therefore, the directions of the lamination sheets
310
should be coincided and laminated in laminating the plurality of lamination sheets
310
as a cylinder shape. Thus, the laminating operation is complex, and productivity is lowered and it is not suitable for mass production.
TECHNICAL GIST OF THE PRESENT INVENTION
Therefore, an object of the present invention is to provide a stator for a reciprocating motor of which components can be fabricated in simple way and assembling property can be improved.
In order to achieve the above objects, there is provided a stator for a reciprocating motor comprising: a bobbin of insulating material on which a coil is wound; a terminal portion formed integrally with the bobbin for electrically connecting the coil to outer electric source a first lamination core in which a plurality of lamination sheets formed as thin plates of predetermined shape are laminated in radial direction along with the bobbin; and a second lamination core, in which a plurality of lamination sheets formed to have predetermined area and length and formed to have symmetric upper and lower sides for a center line of length direction are laminated in radial direction to make a cylinder shape, coupled to the first lamination core to be located on inner or outer side of the first lamination core.


REFERENCES:
patent: 4827163 (1989-05-01), Bhate et al.
patent: 4937481 (1990-06-01), Vitale
patent: 6060810 (2000-05-01), Lee et al.
patent: 2002/0135264 (2002-09-01), Song et al.
patent: 994253 (2000-04-01), None
patent: 97-59497 (1997-08-01), None
patent: 98-20961 (1998-07-01), None
patent: 98-66464 (1998-12-01), None

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