Rotary Table SRT-208KM
 Click to enlarge |
Diameter 338 mm Aperture 208 mm Height 60 mm ... 110 mm Load 100 kg |
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ServoRing rotary tables provide superior angular positioning and are designed to eliminate backlash, friction and wear problems associated with worm, gear and belt drives. Low maintenance and high throughput characteristics of the ServoRing Stage yields the lowest total cost of ownership
Compact package and superior design of the ServoRing rotary stages was optimized to provide highest torque density in the smallest volume. ServoRing stage has clear center aperture that can be used for air or wire line feed-through or beam delivery
To maximize positioning performance ServoRing rotary tables utilizes direct drive three phase segmented brush-less motor technology which allows to optimize torque-speed performance of the stage. "Lo-Cog” magnetic design assures smooth rotation and dynamic performance.
Accurate Positioning performance is assured with precision encoder that provides sub arc-sec positioning resolution. The motor and rotary encoders are directly coupled to eliminate coupling backlash.
Precision preloaded cross-roller bearing for combined axial and radial loads are used to maximize performance with respect to wobble and moment stiffness |
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Parameter |
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Unit |
SRT-208KM-25 |
SRT-208KM-50 |
SRT-208KM-75 |
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Tabletop diameter |
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mm |
338 |
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Height |
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mm |
60 |
85 |
110 |
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Aperture |
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mm |
208 |
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Motor type |
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Three phase brushless Direct drive |
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Number of pole pairs |
P |
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20 |
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Peak Torque (note 1) |
Tp |
Nm |
62 |
124 |
185 |
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Continuous torque (note 2) |
Tc |
Nm |
23 |
46 |
67 |
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Peak current |
Ip |
Amp |
14 |
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Continuous current |
Ic |
Amp |
6 |
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Sine encoder (note 3) standard optional |
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Lines/rev |
5.400 18,000
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Digital encoder (note 4) standard optional |
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Counts/rev |
1,080,000 2,260,000 to 7,200,000 |
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Axial load |
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Kg |
300 |
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Bus voltage (Line voltage) |
V |
VDC VAC |
310 220 |
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Rated speed @ Tc (note 5) |
Nc |
RPM |
250 |
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Radial/axial run-out (note 6) |
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Microns |
30 (-N), 20 (-P), 10 (-SP) |
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Rotating inertia |
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Kg·m2 |
0.006 |
0.012 |
0.018 |
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Stage weight |
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Kg |
17 |
20 |
23 |
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Construction |
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Rotor – steel Stator - aluminum |
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Note 1 |
1sec. duration, coil at 20°C |
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Note 2 |
Coil at 120°C, convection (air) cooling |
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Note 3 |
1Vpp differential, quadrature, index mark Interpolation factor (amplifier): x256, x512, x1024 Digitized resolution (amplifier) = Fundamental resolution * Interpolation Factor |
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Note 4 |
RS422, TTL, 5VDC, differential, quadrature, index mark Interpolation factor (encoder): x50 (standard), x100 Digital resolution (encoder) = Fundamental resolution * Interpolation Factor * 4 |
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Note 5 |
Rated speed based on amplifier bus voltage and motor “Y” winding. Higher speed (Δ) winding on request. Actual speed depends on the encoder resolution, interpolation factor, load, eddy current losses and bearing type |
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Note 6 |
-N standard ABEC 5 bearing, -P precision ABEC 7 bearing, -SP special |
