Linear motor

Details Linear motor Linear motor

2001-05-21

2003-03-04

Mullins, Burton S. (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Linear

C310S016000, C310S052000, C310S064000

Reexamination Certificate

active

06528907

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a linear motor, and more particularly to a linear motor capable of effectively cooling heat generated when the linear motor is driven.
2. Prior Art
As shown in
FIG. 1
, a moving magnet type of linear motor
101
, having two movable tables, is equipped with long plate-shaped stator base
102
. Linear guide projection
103
is formed into a single structure to compose a linear guide by protruding to the outside on the lateral surface of this stator base
102
. A printed circuit board, not shown, is arranged on the upper surface of stator base
102
, and stator armature
107
is formed by adjacently arranging armature coils
104
in close contact so as not to overlap on top of the printed circuit board. Armature coil
104
is formed by winding a large number of turns of a conductor. Each armature coil
104
is arranged adjacent to another armature coil
104
.
Each armature coil is formed by winding so that a single magnetic pole of field magnets
105
and
106
is taken to be the space T. Conducting portions
104
c
and
104
d
are portions that do not contribute to generation of thrust.
A first position detection device group
108
and a second position detection device group
109
are arranged on stator armature
107
. Hall effect ICs, Hall elements, and electromagnetic conversion devices such as electromagnetic resistors can be used for position detection devices
108
and
109
. Reference numerals
104
a
and
104
b
denote conducting portions, respectively.
Field magnets
105
and
106
have a horizontal width that is equal to the horizontal width of armature coil
104
. As a result, since both first and second position detection device groups
108
and
109
will end up detecting the magnetic poles of first and second field magnets
105
and
106
, unless some action is taken to prevent this, first and second moving elements
110
and
111
end up moving on their own. In order to prevent this, field magnet
105
is arranged on the main body (not shown) of first moving element
110
shifted by a prescribed width (width of conducting portion
104
d
of armature coil
104
) in the direction of the lateral surface of one of stator armatures
107
. The above-mentioned constitution is such that first position detection device group
108
and second position detection device group
109
are arranged by shifting by a prescribed width, in advance, so that first moving element
110
and second moving element
111
are not detected simultaneously. Further, with an absence of a cooling system, a load due to overheating of the stator and moving elements occurs when the motor is used for a long time period.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a linear motor capable of accurately maintaining motor characteristics through an effective cooling of the moving element and the stator element of the linear motor.


REFERENCES:
patent: 3668444 (1972-06-01), Davey
patent: 3801843 (1974-04-01), Corman et al.
patent: 3835339 (1974-09-01), Laronze
patent: 6005310 (1999-12-01), Mosciatti et al.
patent: 6300691 (2001-10-01), Hwang et al.
patent: 6339269 (2002-01-01), Hsiao
patent: 57-062754 (1982-04-01), None
patent: 60-118038 (1985-06-01), None
patent: 60-118039 (1985-06-01), None
patent: 62-262832 (1987-11-01), None
patent: 4-183259 (1992-06-01), None

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