Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2000-07-28
2003-09-23
Tugbang, A. Dexter (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S606000, C029S732000, C029S602100, C156S297000, C156S330000
Reexamination Certificate
active
06622369
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an armature of a moving coil type linear motor and a method for assembling the same.
2. Description of the Conventional Art
FIG. 1
shows a perspective view of a moving coil type linear motor consisting of a movable element
20
and a stator element
10
. The stator element
10
includes a U-shaped armature frame
11
and permanent magnets
12
arranged on inner surfaces of the armature frame
11
. The movable element
20
disposed in the U-shaped armature frame
11
consists of a frame
21
and a coil block
22
. When the coil block
22
, formed by molded coils (not shown), is supplied with electric current, a thrust is generated between the coil block and the permanent magnets
12
, causing the movable element
20
to be linearly moved.
In order to couple the coil block
22
into the armature frame
21
as shown in
FIG. 2
a
, there are formed a groove
21
a
in a central region of the armature frame
21
, and spacers
21
b
located at a constant interval in the groove
21
a
. The coil block is formed as follows: the coils
22
a
are first placed between the spacers
21
b
; and the electrical wiring between the coils
22
a
and then the molding for forming the coil block
22
are sequentially conducted. The groove
21
a
and the spacers
21
b
are needed to regulate the pitch between the coils
22
a
and the height thereof in assembling the coils.
In the prior art described above, when the coreless coils
22
a
are assembled, the coil sizes are utilized to maintain the constant height of the coils, and therefore the precise assembling becomes required. Further, to maintain a constant pitch between the coils
22
a
, the machined spacers
21
b
are also needed.
The movable element
20
is assembled in such a manner that a linear movement of the movable element
20
along the axial direction of the stator element
10
becomes made possible. For this, it is required to wire and assemble the coils
22
a
at a constant interval, which will be described below with reference to
FIG. 2
b.
As shown in
FIG. 2
b
, the armature, i.e., movable element
20
, includes the armature frame
21
and the armature coils
22
a
forming the coil block
22
, wherein the armature frame
21
is formed with the groove
21
a
in a central portion thereof and has one side thereof formed with a hole
21
c
through which lead lines
21
d
are placed for external connection.
The armature coils
22
a
to be assembled into the groove
21
a
formed in the armature frame
21
are individually wound in numerous turns and then wired to the lead lines by soldering.
The electrically wired coils
22
a
are arranged and assembled at a predetermined spacing with respect to the armature frame
21
, at the time of which an insulating member
21
e
is used for an insulation between the lead lines of the coils
22
a
. However, those procedures have the problems in that appropriate lengths of the lead lines
22
a
have to be maintained and insulation between the lead lines
22
d
are required.
The detailed procedures of assembling the movable element
20
will be described with reference to
FIGS. 3
a-c
. As shown in
FIGS. 3
a
and
3
b
, at first, the armature frame
21
and the spacers
21
b
are assembled together, to which the coils
22
a
are coupled. Following these procedures, the coils
22
a
are wired to the lead lines. Next, as shown in
FIG. 3
c
, the coils
22
a
are molded
22
b
to form the coil block
22
.
In case of coupling the coils to the prior art armature frame
21
assembled with the spacers
21
b
, the groove
21
a
for assembling the coils has to be sealed. This makes it difficult to mold.
SUMMARY OF THE INVENTION
Therefore, it is an object of the present invention to provide a method for assembling an armature in which inner holes of coils are used to maintain a constant pitch between the coils and height of the coils, whereby a coil block can be readily assembled.
Another object of the present invention is to provide an armature making it possible to easily insulate lead lines of armature coils to each other and to readily perform the wiring of the coils, by using a printed circuit board.
Another object of the present invention is to provide an armature having two layered structure of armature frame facilitating to perform the wiring and molding of the coils.
According to one aspect of the present invention, there is provided a method for assembling an armature of a moving coil type linear motor, the method comprising the steps of: mounting coils, each having an inner hole, into a coil alignment block; covering a top surface of the coil alignment block with an upper cover so as to maintain a constant height of and pitch between the coils, and wiring the coils with each other; assembling a fixing cover and the coil alignment block to fix the coils; covering a bottom surface of the coil alignment block with a lower cover; and adhering with an epoxy adhesive the coils mounted onto the armature frame, and thereby fixing the coils.
According to another aspect of the present invention, there is provided a linear motor comprising: an armature frame; a plurality of armature coils, each coil having a plurality of leads; and a printed circuit board for use in the wiring of the leads and which is incorporated into the armature frame.
According to another aspect of the present invention, there is also provided a moving coil type linear motor comprising: a lower frame having therein a groove for assembling armature coils and integrally formed with spacers at a constant interval along the groove therein; and an upper frame over the lower frame and for sealing the groove at the time of molding the armature coils.
REFERENCES:
patent: 4246694 (1981-01-01), Raschbichler et al.
patent: 5464494 (1995-11-01), Bolte et al.
patent: 5565718 (1996-10-01), Takei
patent: 5712608 (1998-01-01), Shimomura et al.
patent: 4-338617 (1992-11-01), None
Chun Jang Sung
Hwa Hyun Joo
Hwang Ji Hyun
Kim Do Hyun
Mirae Corporation
Rosenberg , Klein & Lee
Tugbang A. Dexter
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