Electrical generator or motor structure – Dynamoelectric – Linear
Reexamination Certificate
2001-09-06
2004-06-22
Lam, Thanh (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Linear
Reexamination Certificate
active
06753626
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a linear motor having an air bearing integrally, and more particularly, to a linear motor having an air bearing for guiding the linear motion of a separately constructed linear motor integrally.
2. Description of the Related Art
Generally, in a linear motor including a stator and a mover, it is necessary that the stator is spaced from the mover at a constant interval in order to directly perform a linear motion. In addition, an air bearing for guiding a precise linear motion is used.
The construction and operation of a conventional linear motor having an air bearing will now be described with reference to the accompanying drawings.
FIG. 1
is a side cross-sectional view illustrating the construction of a conventional linear motor and a conventional air bearing. As illustrated in
FIG. 1
, the linear motor
10
and the air bearing
20
are installed on the bottom surface of a frame
30
, being separated from each other at a predetermined interval. The linear motor
10
includes a stator S and a mover M and the air bearing
20
includes an inverted “U” shaped frame
21
and a guide block
22
.
The stator S of the linear motor
10
has a “U” shaped frame
11
and a plurality of permanent magnets
12
. The permanent magnets
12
are installed on inner walls of the “U” shaped frame
11
at a predetermined interval. The mover M is installed internally in the stator S having the “U” shaped frame
11
and the permanent magnet
12
, and has a straight line type frame
13
and an armature coil
14
. The armature coil
14
is installed on the bottom surface of the straight line type frame
13
, i.e., “−” shaped type. When a thrust force is generated by the interaction between the permanent magnets
12
installed on the inner walls of the “U” shaped frame at the predetermined interval and the armature coil
14
, the mover M performs a linear motion in the longitudinal direction of the stator S.
In the case that the mover M performs the linear motion in the longitudinal direction of the stator S, the air bearing
20
is used for keeping a constant interval between the stator S and the mover M or for smoothly stopping the linear motion. The air bearing
20
is constructed such that the inverted “U” shaped frame
21
is installed to protect the guide block
22
fixedly installed on the ground. The air bearing
20
having the inverted “U” shaped frame
21
and the guide block
22
and the linear motor
10
are installed on the bottom surface of the frame
30
.
The linear motor
10
is constructed such that the straight line type frame
13
is installed on the bottom surface of the frame
30
, and the air bearing
20
is constructed such that the inverted “U” shaped frame
21
is installed on the bottom surface of the frame
30
, for thereby supporting the linear motor
10
by the air bearing
30
. In order to support the linear motor
10
by the air bearing
20
, air is injected into an air supplying pipe
32
in an arrow direction via an air through hole
31
through which the installation surfaces of the frame
30
and the inverted “U” shaped frame
21
are penetrated.
As described above, in the conventional linear motor and air bearing, the thrust force of the linear motor is degraded by installing a separate frame in order to connect the linear motor and the air bearing. In addition, with an asymmetric structure, the rigidity and precision of the linear motor are degraded when a linear motion is conducted by means of the air bearing connected at one side of the linear motor, and a step difference equal to a height h is generated when the linear motor and the air bearing are installed, for thereby causing inconveniency in the installation.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a linear motor having an air bearing integrally.
It is another object of the present invention to provide a linear motor which have a symmetric structure in the linear motion, can be structured simply and can be removed a step difference equal to a height generated when the air bearing and the linear motor are installed.
It is another object of the present invention to provide a linear motor that since the air bearing is formed integrally with the linear motor, the linear motor can be cooled using the air applied to the air bearing.
To achieve the above object, there is provided a linear motor having an air bearing integrally comprising: a “U” shaped frame having a plurality of permanent magnets spaced from each other on its inner walls; an inverted “U” shaped frame spaced from outer walls of the “U” shaped frame at a predetermined interval, having extension frames for protecting the “U” shaped frame and having a plurality of air injection openings for injecting air into both ends of a center frame; and an armature coil unit installed on the bottom surface of the inverted “U” shaped frame and the center frame and spaced from the permanent magnets installed to the inner walls of the “U” shaped frame at a predetermined interval.
In addition, at least one inverted “U” shaped frame is installed in the longitudinal direction of the “U” shaped frame, an air supplying pipes for receiving air from the outside and injecting the same is installed to the air injection openings formed at both ends of the center frame of the inverted “U” shaped frame, and the air supplied to the air injection openings of the inverted “U” shaped frame is supplied between the armature coil unit and the plural permanent magnets.
REFERENCES:
patent: 4114060 (1978-09-01), McLean et al.
patent: 4749921 (1988-06-01), Chitayat
patent: 4798985 (1989-01-01), Chitavat
patent: 5072144 (1991-12-01), Saito et al.
patent: 5668421 (1997-09-01), Gladish
patent: 5838079 (1998-11-01), Morohashi et al.
patent: 6215260 (2001-04-01), Hinds
patent: 63-140657 (1988-06-01), None
Hwang Ji Hyun
Kim Do Hyun
Park Sang Shin
Fleshner & Kim LLP
Jones Judson H.
Lam Thanh
Mirae Corporation
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