Product Description:

The S31GMNH-RNNE-00 is a 6-pole neodymium magnet brushless servo motor built by Pacific Scientific for the S Brushless Motors series. This model provides closed-loop torque and velocity control in automated machinery such as pick-and-place arms and index tables. It follows the metric mounting standard and uses a NEMA 34 frame to simplify mechanical integration, while Interconnectron connectors support straightforward electrical hookup. The motor has a high-voltage construction with winding code G and uses a size 21 frameless resolver for primary feedback. No secondary feedback device or holding brake is fitted.

Operational torque begins with a continuous stall capability of 2.2 Nm, allowing the rotor to maintain load without overheating, while short bursts may reach 6.2 Nm to cover acceleration peaks. The three-phase stator has 16.4 Ω of line-to-line resistance and 41.2 mH of inductance, values that affect copper loss and current rise time when driven by a regulated amplifier. A NEMA 34 frame keeps the mounting face compatible with common gearheads, and stack length is limited to one lamination stack to keep axial size compact. Because the build omits a shaft seal, the installation must prevent fluid ingress at the coupling end.

Dynamic response is assisted by a rotor inertia of 0.18 × 10⁻³ kg·m², allowing rapid speed changes when commanded through a drive tuned to the motor’s 1.3 Nm/ARMS torque constant. Back electromotive force is rated at 0.82 VRMS/rad/sec, so the controller can calculate real-time voltage demand during regenerative events. Despite the six-pole magnet layout, total mass stays at 3.2 kg, which helps reduce load on linear slides and smaller robot joints. The metric mounting pattern, combined with Interconnectron power and signal connectors, supports modular machine layouts. Without a secondary feedback channel, resolver data provides the only commutation and position information to the host servo amplifier, and the lack of a brake means standstill holding must come from external hardware.