Linear motor with an improved cooling structure

Details Linear motor with an improved cooling structure Linear motor with an improved cooling structure

2000-04-10

2001-10-09

Ramirez, Nestor (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Linear

Reexamination Certificate

active

06300691

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a linear motor with an improved cooling structure for cooling heat generated from a coil block of the motor.
2. Description of the Conventional Art
A conventional linear motor, shown in
FIG. 1
, is comprised of a stator element
10
, and a movable element
20
adapted to move along the stator element
10
. The stator element
10
has a U-shaped stator element frame
11
provided with sequentially arranged permanent magnets
12
thereon each having polarity of N- and S-poles. Inside the stator element
10
, is provided the movable element
20
being comprised of a coil block
21
and a movable element frame
22
. The coil block is provided with a coil (not shown). When an external electric current is applied to the coil block
22
, a thrust, being capable of pushing the movable element
20
, is generated according to Fleming's left-hand rule. The thus generated thrust force permits direct linear motion of the movable element
20
along the stator
10
.
In contrast, a linear motor having a movable element
20
provided with permanent magnets includes a stator element
10
having a coil block
21
. When electric current is supplied to the coil block
21
, the movable element
20
having permanent magnets performs a linear motion along the stator element
10
. With the continued supply of current to the coil block
21
so as to drive the linear motor, the coil generates heat causing a problem of current loss which may weaken the thrust or cause malfunction of the linear motor.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a linear motor with an improved cooling structure for cooling heat generated from a coil block of the motor.
Another object of the present invention is to provide a linear motor with an improved cooling structure which provides an air circulation to cool heat generated from a coil block of the motor.
Another object of the present invention is to provide a linear motor with an improved cooling structure being capable of reducing noise and air consumption amount by selectively opening/closing an air valve using a shoe provided at a stator element.
The above objects can be accomplished by the present invention providing a linear motor with an improved cooling structure, the linear motor comprising: a stator element having a stator element frame; a movable element having a movable element frame, adapted to linearly move along the stator; and a heat dissipation plate mounted on the stator element frame and the movable element frame, for externally dissipating heat generated from a coil block.


REFERENCES:
patent: 4916340 (1990-04-01), Negishi
patent: 5825104 (1998-10-01), Kondo et al.
patent: 5831352 (1998-11-01), Takei
patent: 6130490 (2000-10-01), Lee

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