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2 Installation
2.2.3 SGLTW and SGLTM Linear Servomotors (T-type Iron Core)
2-20
(3)
Magnetic Attraction
The linear servomotor is constructed of an opposing moving coil and magnetic way.
So, the magnetic attraction is offset when the air gaps between the moving coils and
the magnetic way are even.
However, achieving an even air gap is difficult due to the accuracy of the linear ser-
vomotor itself and the customer’s machine, and because of errors in the assembly of
the linear servomotor at installation. Consider the magnetic attraction values (calcu-
lated values) shown in the following table when designing the system.
Indicates an air gap when one side is +0.3 mm and the other side
0.3 mm relative to the
design values.
Indicates the magnetic attraction at maximum force.
Moving Coil
Model
SGLTW-
Air gap
G1
1
in mm
Air gap
G2
1
in mm
Magnetic
attraction
F1
2
(N)
Magnetic
attraction
F2
2
(N)
Attraction
difference
F
(N)
20A170A
1.3
0.7
760
1030
270
20A320A
1510
2040
530
35A170A
1.3
0.7
1330
1800
470
35A170H
1330
1800
470
35A320A
2650
3570
920
50A170H
1.3
0.7
1900
2600
700
Air gap
G1
Magnetic
attraction
F1
Moving coil
Magnetic way
Magnetic way
Magnetic
attraction
F2
Air gap
G2
