ST/SN Series AC Synchronous Motors

ST and SN Series synchronous motors provide high performance in three frame sizes, NEMA 23, 34 and 42 (60, 90 and 110 mm). Resistor-capacitor kits are also available. These motors are driven economically from standard AC line voltage and the synchronous speed is related to the line frequency.

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  • ST models: NEMA 23 (60 mm), three stack length options with torque ratings to 131 N-cm (185 oz-in)
  • SN3 models: NEMA 34 (90 mm), three stack lengths with torque ratings from 198 to 636 N-cm (280 to 900 oz-in)
  • SN4 models: NEMA 42 (110 mm), three stack lengths with torque ratings from 500 to 1059 N-m (715 to 1500 oz-in)
  • All models offer flying lead, terminal box, connector and shaft extension options
  • 72 rpm motor speed (with 60 Hz voltage)
  • Constant speed does not vary with load
  • 120 volt AC models
  • Fast starting, stopping and reversing
  • Can be stalled indefinitely without overheating
  • Standard connections include leaded, terminal box, MS connectors, rear shaft

 

Model NEMA Frame Sizes Rated Torque (oz-in) Max Load Inertia (oz-in-s1) Standard Options
ST Series 23 4 80-185 0.02 - 0.15 L, T, MS, RS
 SN3 Series 34 4 280-900 0.19 - 0.46 L, T, MS, RS
SN4 Series 42 3 715-1,500 0.32 - 0.69 L, T, MS, RS
TypeTitleSizeDate 

Agency Approvals

Kollmorgen EU Declaration of Conformity PowerPac K-N-SNKollmorgen EU Declaration of Conformity PowerPac K-N-SN114.5 KB5/25/2017Email
US Production