Product Description:

The R31SSNC-R2-NS-NV-02 is an AC servo-class rotary actuator manufactured by Pacific Scientific. It belongs to the R Servomotors series and is used on indexing tables, pick-and-place axes, and general positioning stations in automated assembly lines. The unit is intended for servo systems that regulate speed and position through closed-loop control. By combining a compact housing with high-energy magnetics, the motor converts drive current into proportional torque and speed, allowing motion controllers to maintain precise motion under changing loads during repeated duty cycles.

Mechanical design follows housing style C, which uses a square aluminum frame that aligns with common NEMA mounting patterns and leaves clearance for adjacent drivetrain components. The square frame format also fits many standard machine layouts without unnecessary overhang. Continuous torque capability is supported by rare earth samarium cobalt magnets, whose high coercivity helps maintain magnetic flux at elevated operating temperatures and permits a smaller rotor diameter. Rotor position is measured by frameless resolver feedback, a transformer-based sensor that produces analog sine and cosine voltages proportional to shaft angle. This feedback method avoids optical disc wear and tolerates oil vapor in industrial environments with light contamination.

Resolver mounting matches the size 21 transmitter envelope, so standard converters can be fitted without adapter plates. The motor is supplied without a holding brake, so load holding during power loss must be provided by external mechanics. Omitting the brake also avoids adding inertia to the load train. It has no secondary feedback, so all commutation and position data come from the primary resolver. The shaft exit has no shaft seal, so a separate seal or enclosure-level protection is needed where splash or airborne particles are present.