11.1 Reference Information for Servomotor Capacity Selection
11.1.1 GD
2
for Simple Diagrams
11-2
11.1
Reference Information for Servomotor Capacity Selection
11.1.1
GD
2
for Simple Diagrams
When Rotary Shaft Is
Aligned with Center Line
of Cylinder
When Rotary Shaft Runs
Through Gravitational
Center
When Rotary Shaft Is on
One End
When Rotary Shaft Is
Outside Rotating Body
General Formula When
Rotary Shaft Is outside
Rotating Body
GD
2
= Weight × (Diameter of rotation)
2
Solid cylinder
OR
: Density (g/cm
3
)...Copper: 7.866
: Length (m)
( = /2 )
=125π
D
GD
L
: Diameter (m)
D
D
0
D
0
2
24
2
ρ
ρ
LD
Hollow cylinder
OR
:Density (g/cm
3
)
: Length (m)
= /2
=125π
D
GD
L
:Diameter (m)
D
0
2
2
2
D
1
2
D
0
4
D
1
4
ρ
ρ
( + )
( + )
L
D
0
D
1
,
D
0
D
1
= ( + )/3
Rectangular solid
Db
b
c
c
222
=
/3 + /4
Cylindrical body
DL
L
D
0
D
0
22 2
D
0
D
1
=
-
Hollow sphere
5
2
D
2
D
0
5
D
1
3
-
D
0
3
D
1
3
c
b
C
= (4 + )/3
Rectangular solid
Db
222
D
0
=+
Cylindrical body
L
L
3
4
4
D
22
D
0
2
b
d
b
bd d
c
C
=
+4( + )
Rectangular solid
3
4+
D
2
22
2
D
0
L
L
D
0
+
4
dL d
d
=
+4( + )
Cylindrical body
3
4
D
2
2
2
2
d
Center of gravity
Rotary shaft
: Diameter of rotation when shaft that is parallel to rotary shaft and
runs through center of gravity virtually operates as a rotary shaft
General Formula for Diameter of Rotation When Rotary Shaft Is
Outside Rotating Body
=
+4
D
2
2
D
1
22
d
D
1
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