Electrical generator or motor structure – Dynamoelectric – Linear
Reexamination Certificate
2001-02-07
2004-11-30
Lam, Thanh (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Linear
Reexamination Certificate
active
06825580
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus and method for controlling cooling of a gantry having a linear motor, and more particularly to an apparatus and method for controlling cooling of a gantry in which peripheral environment of a linear motor of a gantry is measured, and if a gantry is overheated, it is cooled by using a cooling fan or an air nozzle.
2. Description of the Background Art
Generally, a surface mounting device (SMD) is to mount electronic components on a printed circuit board (PCB), for which an X-Y gantry including a pickup module is employed and a linear motor is adopted to the X-Y gantry as a driving force.
FIG. 1
is a schematic perspective view of a gantry having a linear motor in accordance with a conventional art.
As shown in the drawing, the conventional gantry includes a plurality of linear motors
10
adopted to a Y-axis frame and a linear motor
20
adopted to an X-axis frame.
Each linear motor
10
adopted to the Y-axis frame includes a stator
11
and a mover
12
. The stator
11
includes a ‘U’-type frame
11
a
and a plurality of permanent magnets
11
b
arranged at predetermined intervals at the inner both side surfaces of the ‘U’-type frame
11
a
. The mover
12
includes a flat-type frame
12
a
and a coil block
12
b
formed at the bottom surface of the flat-type frame
12
a
. The coil block
12
b
is formed in a manner that a plurality of coils (not shown) are arranged at predetermined intervals at the bottom surface of the flat type frame
12
a
and molded by an insulating material.
The linear motor
20
adopted to the X-axis frame installed on the mover
12
of the linear motors
10
of the Y-axis frame also includes a stator
21
and a mover
22
, similarly to the linear motors
10
of the Y-axis frame.
The stator
21
includes a ‘U’-type frame
21
a
and a plurality of permanent magnets
21
b
, and the mover
22
includes a flat-type frame
22
a
and a coil block
22
b
with a plurality of coils (not shown) arranged.
With the X-Y gantry constructed as described above, a pickup module (not shown) for pick and place components is installed at a predetermined portion of the mover
22
of the linear motor
20
adopted to the X-axis frame. Movement of the pickup module in the X-axis direction is made by the mover
22
of the X-axis linear motor
20
, while movement of the pickup module in the Y-axis direction is made by the mover
12
of the plurality of linear motors
10
of the Y-axis frame.
In order for the pickup module to pick up and place electronic components on a printed circuit board (not shown), the upper portion of the printed circuit board is moved in the X-Y direction by the mover
12
of the Y-axis linear motor
110
and the mover
22
of the X-axis linear motor
20
.
In order to move the pickup module in a predetermined direction, the Y-axis linear motor
10
and the X-axis linear motor
20
are used for a long time. In this case, heat is generated from the coil blocks
12
b
and
22
b
formed at each stators
12
and
22
. That is, the coil blocks
12
b
and
22
b
formed at the stators
12
and
22
includes the plurality of coils, so that when a driving power source is continuously supplied to the plurality of coils, heat is inevitably generated.
Conventionally, however, there is no method for removing the heat generated from the Y-axis linear motors
10
and the X-axis linear motor
20
, so that the linear motor is overloaded, causing that the gantry is stopped or malfunctioned.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide an apparatus and method for controlling cooling of a gantry having a linear motor which is capable of controlling a velocity of an Y-axis linear motor and an X-axis linear motor to lower down heat of a linear motor when the linear motor of a gantry is overheated.
Another object of the present invention is to provide an apparatus and method for controlling cooling of a gantry having a linear motor which is capable of cooling an overheated linear motor by driving a cooling unit when the linear motor of a gantry is overheated.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided an apparatus for controlling cooling of a gantry having a linear motor including: a stator provided with a first temperature sensor, having a heat sink and a cooling fan at predetermined portions of an X-axis and an Y-axis linear motors; a mover provided with a second temperature sensor, having a heat sink installed on the upper surface of an X-axis and a Y-axis linear motors; an encoder for sensing a position and velocity of the mover; an encoder periphery sensor part for measuring surroundings (a temperature, a humidity and a pressure) of the encoder; an A/D converter for receiving a first and a second temperature signals and converting them from an analog signal to a digital signal and outputting the same; a controller for controlling a drive signal outputted from a mover driver unit to control the velocity of the Y-axis linear motor and the X-axis linear motor; a D/V converter for converting digital signals, that is, a cooling fan control signal and an air valve control signal to a plurality of drive signals, that is, analog signals; and a mover driver for providing the drive signal to a coil block.
To achieve to above objects, there is also provided a method for controlling cooling of a gantry including the steps of: operating at least one mover (S
11
); measuring temperatures of an X-axis and a Y-axis stators (Txs, Tys) by means of temperature sensors (S
12
); measuring temperatures of an X-axis and a Y-axis movers (Txm, Tym) by means of temperature sensors (S
13
); storing the measured temperature (Txs, Tys, Txm and Tym) on the stators and movers and comparing them with a pre-set temperature, that is, a comparative value (S
14
); storing the temperature information (Txs, Tys, Txm and Tym), comparing them with the comparative value of the pre-set temperature, and computing a difference between them in case that the temperatures (Txs, Tys, Txm and Tym) are greater than the pre-set comparative value (S
15
); computing a temperature gain corresponding to the computed temperature difference (S
16
); and driving a first and a second cooling fans
14
a
and
14
b
and an air valve
33
as long as the temperature gain, to perform cooling (S
17
).
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
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Hwang Ji Hyun
Kim Do Hyun
Lee Ki Ha
Jones Judson H.
Lam Thanh
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