EDH0398En1011 — 09/18
6
IMS-LM-S Series High-Performance Long-Travel Linear Motor Stages
4.0 —
Drive and Motor
4.1
Motor characteristics
IMS-LM-S stages are equipped with a 3-phase synchronous ironcore linear
motor and a linear steel scale.
CAUTION
High RMS current will generate motor heating which will degrade
characteristics of the stage, such as repeatability, accuracy, etc…
4.2
Command Signals
NOTE
The values above indicate induced voltages between coils. A positive
value for L-M would indicate a higher voltage on L relative to M.
Magnet Pitch (Commutation period)
24 mm
Motor constant
180 N
2
/W
Force sensitivity
38.9 N/Arms
Back-emf constant
31.7 V/m/s
Motor resistance
5.6
Ω
Motor inductance
36 mH
Thermal resistance
0.7 °C/W
Max. speed @ Max. voltage
8 m/s @ 560 V
Peak current
6 Arms
Peak force
210 N
Max. rms current
3.1 Arms
Max. rms force
120 N
Temperature Sensor
PTC, 1 k
Ω
L-M
-2
0
-0.5
-1
-1.5
0.5
1
1.5
2
A
m
p
lit
u
d
e
L-N
M-N
Induced Voltages Coil Moving
Direction –
MOTION
Dir
R
T
(
Ω
)
2500
2000
1500
1000
500
0
50
T
A
(°C)
100
EHA07248
-50
0
150
Positive Temperature Coefficient
Thermistor, resistance as a function
of temperature. Motor heating is
typically restricted to 20 °C with
Newport Controllers.
Dir
