The Pacific Scientific SN Synchronous Motors series is a line of AC synchronous motors designed for low-speed constant-speed drives with bidirectional operation.
These motors are driven directly from standard AC line voltage, and their running speed is tied to the supply frequency rather than varying with load in normal synchronous operation. The series includes SN3 and SN4 frame groups in NEMA 34 and NEMA 42 sizes, with multiple stack lengths and torque levels offered within each frame family. Available product options include different connection styles such as flying leads, terminal box, connector, and shaft extension arrangements, along with associated resistor-capacitor kits for phase shifting. Overall, the SN series is intended for applications that need fixed synchronous speed, relatively simple AC-powered motor operation, and a choice of frame sizes and torque ratings within the same motor family.
