Product Description:

The S31GNAA-RNNM-00 is a 6-pole Neodymium magnet brushless servo motor produced by Pacific Scientific within the S Brushless Motors series. As a NEMA-frame unit, it installs directly into machinery that follows that mechanical standard. It supplies closed-loop rotary actuation for industrial automation axes that need mid-range torque with resolver feedback.

This model delivers a continuous stall torque of 2.2 Nm and can reach a peak of 6.2 Nm during short accelerations. Torque per ampere is fixed by a constant of 1.3 Nm/ARMS, while back-EMF rises at 0.82 VRMS/rad/sec; together these parameters guide drive selection and current loop tuning. The three-phase stator presents a line-to-line inductance of 41.2 mH, providing natural filtering of current ripple. A 24 V dc brake is fitted to hold position when power is removed, and the single stack length keeps the overall motor shorter without sacrificing thermal mass. Position feedback is supplied by a size 21 frameless resolver, and no secondary feedback device is present. The winding code G matches the resistance, inductance, and thermal characteristics used with medium-voltage servo amplifiers.

Electrical losses are influenced by a line-to-line resistance of 16.4 Ohms, and dynamic response is shaped by a rotor inertia of 0.18×10⁻³ kg·m². The motor weighs 3.2 kg, so it adds minimal load to moving carriages. It mounts on a NEMA 34 frame, simplifying retrofit into standard gearheads or brackets, and uses a motor-mounted MS connector for power, brake, and resolver terminations. Because there is no shaft seal, the installation area must be free of fluid ingress. The design follows the NEMA frame mounting standard and relies on convection through the housing surface to manage temperature generated in the single stator stack.