5
EDH0398En1011 — 09/18
IMS-LM-S Series High-Performance Long-Travel Linear Motor Stages
3.3
Hard Stop: Speed Limitation Versus Load
IMS-LM-S stage uses electrical end-of-run and elastomer hard stops to stop
the carriage as smoothly as possible past the end-of-runs. The overtravel
allowed by the hard stops is 8 mm.
When the stage is used with Newport controllers, the factory settings of
the "software limits" prohibit any commanded motion beyond this travel
range.
Nevertheless, for safety reasons, follow the recommendations
above to minimize risk of mechanical damage, in case of failure
or incorrect adjustment of parameters.
The maximum speed of the stage must be limited so that the
hard stops will always stop the carriage in 8 mm or less, to
avoid any shock between the carriage and stage body.
The graph at left, provides stage speed as a function of applied
load. This curve defines allowed operating conditions to stop
within the 8 mm over-travel allowed by the hard stops. To stop
within this distance, the user must maintain speed and load
within this tolerance. This graph assumes correct wiring of the
electrical end of runs will cut motor power before contact with
the hard stop.
3.4
Load Characteristics and Stiffness
Normal Load Capacity (Cz)
Maximum load a stage can move while maintaining specifications.
3.5
Stage Weights
The stage weights indicated below do not include the cables.
Load on Carriage (kg)
Maximum Speed for Hard Stoppers
200
280
360
440
520
600
680
760
840
920
1000
0
5
10
15
20
25
30
35
40
45
50
55
60
S
p
e
e
d
(
m
m
/s
)
IMS-LM-S IMS-LM-SA-S
Cz, Normal center load capacity on bearings 600 N 100 N
k
a
x, Angular stiffness (Roll) 1 µrad/Nm 2 µrad/Nm
k
a
y, Angular stiffness (Pitch) 0.2 µrad/Nm 2 µrad/Nm
k
a
z, Angular stiffness (Yaw) 1 µrad/Nm 1 µrad/Nm
Q, Off-center load Q
≤
Cz/(1 + D/90)
D, Cantilever distance in mm
Z
Y
Q
H
D
Cz
X
Weight [lb (kg)]
-LM -LM-SA
IMS300-S 37.5 (17) –
IMS400-S 41.9 (19) –
IMS500-S 46.3 (21) –
IMS600-S 50.7 (23) –
IMS800-S 52.9 (24) 52.9 (24)
IMS1000-S 61.7 (28) 61.7 (28)
IMS1200-S 70.5 (32) 70.5 (32)