Kinetic energy / Rotation time
In rotating movement, inertia of load may cause damage to interior parts even if the required
torque of load is small. Select a model after considering moment of inertia of load, kinetic
energy, and rotation time. (The graph of moment of inertia and rotation time is useful for
selecting models.)
Allowable kinetic energy and adjustable range of rotation time
Table 5.
Allowable kinetic energy and adjustable range of rotation time
Size
Allowable kinetic energy (J)
adjustable range of rotation time
safe
in operation
(
s/90°
)
*
MSAU 1
0.0065
0.07
~
0.3
MSAU 3
0.017
MSAU 7
0.042
MSAU 20
0.073
Operation at speed lower than the adjustable range of rotation time may cause stick slip phenomenon
or operation stop.
Moment of inertia
The moment of inertia indicates how hard it is to rotate an object, and also how hard it is to stop the object
once it is rotating.
An object started by the rotary table is getting to have inertial force.
When the rotary table stops at the stroke end, the actuator will receive a big impact (kinetic energy) due to
the inertial force.
Please refer below for calculation of kinetic energy.
2
)
(
2
1
O
I
I
E
E: Kinetic energy [
J
]
I: Moment of inertia of load [
2
m
kg
]
Io: Moment of inertia of load [
2
m
kg
]
ω: Angular speed [
s
rad
]
The following table shows moment of inertia of table.
Table 6.
Moment of inertia of table
(kg
・
m
2
)
Size
Allowable kinetic energy (J)
MSAU 1
2.5x10
-6
MSAU 3
6.2x10
-6
MSAU 7
16.0x10
-5
MSAU 20
28.0x10
-5
- 24
–
Date 3
2020-10-13 11:15
DI987004