Rotary Tables SRT23-SRT67

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

Parameter

Unit

SRT23.

153.25

SRT46.

153.50

SRT67.

153.75

Tabletop diameter

mm

225

Height

mm

115

140

165

Aperture

mm

95

Motor type

Three phase brushless

Direct drive

Number of pole pairs

P

20

Peak Torque   (note 1)                     

Tp

Nm

62

124

185

Continuous torque  (note 2)

Tc

Nm

23 

46

67

Peak current

Ip

Amp

14

Continuous current

Ic

Amp

6

Sine encoder   (note 3)

standard

optional

Lines/rev

5.400

18,000

Digital encoder   (note 4)

standard

optional

Counts/rev

1,080,000

2,260,000 to 7,200,000

Axial load                  

Kg

300

Bus voltage

(Line voltage)

V

VDC

VAC

310

220

Rated speed @ Tc     (note 5)

Nc

RPM

250

Radial/axial run-out   (note 6)

Microns

30 (-N),  20 (-P),  10 (-SP)

Rotating inertia

Kg·m²

0.006 

0.012

0.018

Stage weight

Kg

17

20

23

Construction

Rotor – steel

Stator - aluminum

Note 1

1sec. duration, coil at 20°C

Note 2

Coil at 120°C, convection (air) cooling

Note 3

1V_pp differential, quadrature, index mark

Interpolation factor (amplifier): x256, x512, x1024

Digitized resolution (amplifier) = Fundamental resolution * Interpolation Factor

Note 4

RS422, TTL, 5VDC, differential, quadrature, index mark

Interpolation factor (encoder): x50 (standard), x100

Digital resolution (encoder) = Fundamental resolution * Interpolation Factor * 4

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

Note 6

-N standard ABEC 5 bearing, -P precision ABEC 7 bearing, -SP special