Electrical generator or motor structure – Dynamoelectric – Linear
Reexamination Certificate
2000-06-05
2003-03-04
Nguyen, Tran (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Linear
Reexamination Certificate
active
06528905
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cooling apparatus for an XY gantry, and more particularly to a cooling apparatus which cools an X-axis and Y-axis linear motors used when linear motors are employed for the XY gantry adapted to travel on the plane to perform works.
2. Description of the Conventional Art
An XY gantry is used in various kinds of machine tools, parts assembling apparatus, etc., which travel on the plane defined by an X-axis and Y-axis for performing predetermined works. For example, the XY gantry is used in high-speed, accurate surface mounting apparatus for performing picking up and transferring of the parts and accurately guiding the moved parts to a printed circuit board (PCB) for their surface mounting.
With reference to the accompanying drawings, the XY gantry will be explained which guides in traveling on the X-Y plane.
FIG. 1
is a perspective view of the XY gantry. As shown in
FIG. 1
, the XY gantry includes an X-axis linear motor
10
and a Y-axis linear motor
20
. The Y-axis linear motor
20
is disposed to travel along the Y-axis in the plane. The X-axis linear motor
10
disposed on a frame
30
bridging two Y-axis linear motors
20
travels along the X-axis in the plane to be moved to a predetermined position designated on the plane. The X-axis and Y-axis linear motors
10
,
20
which are moved to the designated position on the plane consist of stator elements
11
,
21
and moving elements
12
,
22
, respectively.
The stator elements
11
,
21
have a plurality of permanent magnets
11
a,
21
a
arranged inside U-shaped frames
11
b,
21
b,
while the moving elements
12
,
22
have armature frames
12
b,
22
b
and coil blocks
12
a,
22
a.
The X-axis and Y-axis linear motors
10
,
20
provide propelling power generated between the coil blocks
12
a,
22
a
and each of the plurality of permanent magnets
11
a,
21
a,
when a current is supplied to each of the coil blocks
12
a,
22
a.
The propelling power allows the moving elements
12
,
22
to be moved to the position designated on the plane defined by the X-axis and Y-axis.
In case the conventional XY gantry employs the X-axis and Y-axis linear motors
10
,
20
, the supply of a current into each of the coil blocks
12
a,
22
a
is needed to be moved to the designated position along the X-axis and Y-axis in the plane. A large amount of heat is generated from the coil blocks
12
a,
22
a
to which the current is supplied.
There occurred problems in that heat generated from each of the coil blocks
12
a,
22
a
constituting the X-axis and Y-axis linear motors
10
,
20
weakens the propelling power of each of moving elements
12
,
22
, or further causes malfunction of devices (not shown) for driving the linear motors.
SUMMARY OF THE INVENTION
Therefore, it is an object of the present invention to solve problems mentioned above, by providing a cooling apparatus for cooling heat generated from coil blocks by using air introduced through a plurality of through-holes formed in X-axis and Y-axis liner motor employed in a XY gantry which travels on a plane defined by an X-axis and Y-axis to perform predetermined works.
To accomplish an object of the present invention, a cooling apparatus for the XY gantry is provided which comprises: X-axis and Y-axis linear motors having respective stator element and moving element, the stator element and moving element having through-holes formed in one side thereof so that external air is introduced therethrough to flow along surface of coil blocks included in the respective moving element of the X-axis and Y-axis linear motors, thereby cooling heat generated from the coil blocks.
According to the present invention, an advantage is provided in that heat generated from each of the coil blocks can be cooled by air flowing through the air passages provided by respective through-holes of the X- and Y-axis linear motors applied to the XY gantry,
REFERENCES:
patent: 3852627 (1974-12-01), Davis
patent: 4836111 (1989-06-01), Kaufmann
patent: 5703420 (1997-12-01), Kamata et al.
patent: 5834862 (1998-10-01), Hartzell, Jr.
patent: 5886433 (1999-03-01), Oda et al.
patent: 6089262 (2000-07-01), Hart
patent: 405162040 (1993-06-01), None
Chun Jang Sung
Hwang Hyun Joo
Hwang Ji Hyun
Kim Do Hyun
Fleshner & Kim LLP
Jones Judson H.
Mirae Corporation
Nguyen Tran
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