YASKAWA SGLGW User Manual page 43

2 Installation
2.2.3 SGLTW and SGLTM Linear Servomotors (T-type Iron Core)
(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.
Moving Coil
Model
SGLTW-
20A170A
20A320A
35A170A
35A170H
35A320A
50A170H


2-20
Air gap
1
G1
in mm
1.3
1.3
1.3
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.
Air gap
G1
www.dadehpardazan.ir 88594014-15
Magnetic
Air gap
attraction
1
G2
F1
in mm
760
0.7
1510
1330
0.7 1330
2650
0.7 1900
Moving coil
Magnetic Magnetic
attraction attraction
F1 F2
Air gap
G2
Magnetic
attraction
2 2
F2
(N) (N)
1030
2040
1800
1800
3570
2600
Attraction
difference

F
(N)
270
530
470
470
920
700