Product Description:

The S31ANNH-RNNM-00 is a 6-pole Neodymium magnet brushless servo motor built by Pacific Scientific for the S Brushless Motors series. As a torque-producing motor in industrial automation, it supplies commanded motion to medium-inertia loads where quick acceleration and precise position control are required. Integrated resolver feedback enables closed-loop operation with the matching drive, while the motor’s high-energy magnets and laminated stack reduce losses for continuous-duty applications on packaging lines and small gantries. Its construction follows NEMA mounting conventions to simplify retrofit into existing frames.

This model delivers a continuous stall torque of 2.2 Nm, which indicates the sustained force available at zero speed for holding or low-velocity tasks. When rapid indexing is needed, a peak torque capacity of 6.2 Nm provides short-term acceleration without overheating. Dynamic response is influenced by the rotor inertia, specified at 0.18 kgm² x10^-3, and this low value supports quick speed changes with limited drive current demand. Mechanical attachment uses the NEMA 34 frame size, allowing direct interchange with standard stepper or servo mounts. The high-voltage construction enables operation on drives that supply higher bus levels for improved power density. Primary feedback is handled by a Size 21 frameless resolver, which provides analog sine-cosine signals for reliable position tracking.

Overall mass is 3.2 kg, which keeps the motor manageable on cantilevered axes while still supporting thermal stability. Power and signal conductors terminate through a motor-mounted MS connector, which keeps cable routing compact at the housing. The laminated core uses a 1-stack length, paired with winding type A to balance resistance and inductance for medium speed ranges. The motor is supplied without an integral brake, shaft seal, or secondary feedback, which keeps the assembly simple and limits added inertia.