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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Limited availability outside North America

Features

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-cm (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

Specifications

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

Media & Downloads

Manuals Literature Drawings Certifications

Title	Language	Date	Share URL
Kollmorgen Catalogo Automazione e Motion Control IT	Italian	2020-01-01	Share URL view
Kollmorgen Automation and Motion Control	English	2021-06-14	Share URL view
Kollmorgen otomasyon ve hareket kontrol çözümleri kataloğu TR	Turkish	2016-02-12	Share URL view
Stepper and Synchronous Motors Catalog EN Rev C	English	2014-02-19	Share URL view
科尔摩根运动控制及伺服系统解决方案	Chinese, Simplified	2018-01-26	Share URL view

These 3D models are intended to guide your design activities and may be used as reference information. Be sure to consult a Kollmorgen expert to ensure you have the most current and accurate information for critical aspects of design work.

Title	File Language	Date	Share URL
Superior Stepper Connection Diagrams EN.pdf	English	29 Sep 2011	Share URL /sites/default/files/public_downloads/Superior-Stepper-Connection-Diagrams_en-US.pdf
Superior Synchronous Connection Diagrams en US.pdf	English	29 Sep 2011	Share URL /sites/default/files/public_downloads/Superior-Synchronous-Connection-Diagrams_en_US.pdf

Title	File Language	Date	Share URL
Blue Guide	English, German	29 Jun 2022	Share URL https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=OJ%3AC%3A2022%3A247%3ATOC
Kollmorgen EU Declaration of Conformity PowerPac K-N-SN	English	25 May 2016	Share URL /sites/default/files/public_downloads/Kollmorgen%20EU%20Declaration%20of%20Conformity%20PowerPac%20K-N-SN.pdf