Yaskawa Sigma-5 User Manual: Setup for Linear Motors - Manual (Page 43)

2.2 Linear Servomotor Installation
2-21
2
Installation
(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.
∗1. Indicates an air gap when one side is +0.3 mm and the other side −0.3 mm relative to the
design values.
∗2. Indicates the magnetic attraction at maximum force.
∗3. The value in parentheses is the dimensions when the magnet protection cover is used.
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
Δ
F
(N)
20A170
1.3
(1.1)* 3
0.7
(0.5)* 3
760 1030 270
20A320 1510 2040 530
20A460 2260 3050 790
35170
1.3
(1.1)*
3
0.7
(0.5)*
3
1330 1800 470
35320 2650 3570 920
35A460 4000 5400 1400
40400
1.7
(1.5)* 3
1.1
(0.9)* 3
4700 5900 1200
40600 7000 8700 1700
50170
1.3
(1.1)*
3
0.7
(0.5)*
3
1900 2600 700
50320 3750 5100 1350
80400
1.7
(1.5)* 3
1.1
(0.9)* 3
9200 11400 2200
80600 13600 16900 3300
Air gap
G1
Magnetic
attraction
F1
Moving coil
Magnetic way
Magnetic way
Magnetic
attraction
F2
Air gap
G2