SME 12 - Dimensions & Weights; Drive System; Speed Range

7
3. DIMENSIONS & WEIGHTS
Turntable mm (inch)
 Width 370(14.57)
 Depth 350(13.80)
 Height(topoftonearm) 178(7.0)
 PlaerDiameter 304(11.97)
 SpindletoArm 215.35(8.48)
Speed Control Unit
 Width 170(6.70)
 Depth 305(12.0)
 Height 68(2.67)
Power Unit
 Height 83(3.26)
 Width 190(7.48)
 Depth 243(9.56)
Plaer 305(12.0)
Weight kg (Ib)
 Turntable 21.16(46.64)
 PowerUnit 4.04(8.9)
 SpeedControlUnit 2.88(6.34)
 Shipping 33.0(72.7)
4. DRIVE SYSTEM
The turntable is driven by a custom made bi-phase AC synchronous
motor.ThespeedcontrolunitusesadedicatedDSPenginetogenerate
two independent pure mathemacal sine waves which provide total
controloffrequency,phaserelaonshipandamplitude.Theseinturnare
matched (tuned)tothe motor foraccuracyto obtainthe bestpossible
performance. The output driver stage is a 2 channel, class AB Bi-polar
designwith low distoronandrelay coupled directlytothe motor. The
enredesignisimplementedusinghighqualitysurfacemounttechnology
onagoldplatedFR4PCB.
5. SPEED RANGE
Thespeedrangeis33
1
/
3
and45rpmwithindependentmemorysengsvia
a switched encoder.