— 6-7 —
6.3.3. Load Inertia
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Generally, the load inertia is much bigger than the rotor inertia of the Motor. The following table
shows the approximate inertia capacity. (Inertia is shown as J in kg·m
2
.)
Table 6-3 : Inertia Capacity
(Unit: kgm
2
)
High speed positioning
General use
Large inertia
(Low speed positioning)
YS2005
0.006 ~ 0.25
0.25 ~ 0.5
–
YS2020
0.025 ~ 1
1 ~ 2
–
YS3008
0.01 ~ 0.4
0.4 ~ 0.8
–
YS3040
0.05 ~ 2
2 ~ 4
–
YS4080
0.1 ~ 4
4 ~ 8
–
YS5120
0.15 ~ 6
6 ~ 12
12 ~ 30
YS5240
0.3 ~ 12
12 ~ 24
24 ~ 125
JS0002
0.003 ~ 0.1
0.1 ~ 0.2
–
JS1003
0.004 ~ 0.15
0.15 ~ 0.3
–
JS2006
0.008 ~ 0.3
0.3 ~ 0.6
–
JS2014
0.018 ~ 0.7
0.7 ~ 1.4
–
Caution : Refer to “4.1. Motor Specification” for allowable axial load and moment load to
confirm the Motor capacity for actual use conditions.
6.3.4. Fluctuating Load Inertia
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Changes in the inertia load directly influence the performance and stability of direct drive motors. In
the case of large changes in the load inertia it may be necessary to change the servo loop gain. To
minimize the effect of load inertia fluctuations, the ratio of inertia fluctuation should be kept as small
as possible, preferably less than 1:
Jmax - Jmin
Ri =
Jmin
(Where Ri = ratio of inertia fluctuation, Jmax = load inertia at maximum, Jmin = load inertia at
minimum, Jrotor = rotor inertia)
6.3.5. Motor Operating Condition
◊
Ambient Temperature : 0 ~ 40°C.
◊
Relative Humidity
: 20 ~ 80 % (Non-condensing)
◊
Indoor use only
◊
The area where the Motor is mounted must be free of corrosive gas, dirt, dust and any
other contamination.
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YS and JS Motor series are not water-tight. If the Motor is to be used where smaller particles
and/or water may be present, it must be protected by another cover or enclosure.
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Do not apply any machining, such as drilling or cutting.
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