S31GNNA-RNNM-00 Pacific Scientific
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The Pacific Scientific S31GNNA-RNNM-00 is a 6-pole Neodymium magnet brushless servo motor from the S Brushless Motors series. It features a continuous stall torque of 2.2 Nm, peak torque of 6.2 Nm, and uses a size 21 frameless resolver as the primary feedback device. The motor follows the NEMA 34 frame standard, weighs 3.2 kg, and has a winding type G.
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Product Description:
Pacific Scientific builds the S31GNNA-RNNM-00 as part of its S Brushless Motors series. The unit is a 6-pole brushless servo motor with neodymium magnets for position and speed control in automated machinery where repeatable torque and quick acceleration are required. It is suitable for compact motion axes that need accurate starts, stops, and stable low-speed operation. Its servo-oriented design supports repeated indexing, feed, and positioning cycles where motion must reverse quickly without losing control accuracy.
The motor develops a continuous stall torque of 2.2 Nm, allowing it to hold load when commanded current is sustained, while a peak capability of 6.2 Nm supports transient moves such as rapid indexing. Its torque constant is 1.3 Nm/ARMS, which states how much torque is produced per ampere delivered by the drive. Phase windings have a line-to-line resistance of 16.4 Ohms and an inductance of 41.2 mH, values that influence current rise time, thermal loading, and current-loop tuning in the servo amplifier. The motor uses one stack length and a G-type winding for its rated speed range. Primary feedback comes from a size 21 frameless resolver, wiring is routed through a motor-mounted MS connector, and the assembly mounts on equipment that follows the NEMA frame standard. This arrangement supports closed-loop motion control with a compact electrical interface at the motor body.
The electrical constant of 0.82 VRMS/rad/sec describes the back EMF generated per unit speed and is used by the controller for velocity estimation. Dynamic response is aided by a rotor inertia of 0.18 ×10−3 kg·m², enabling rapid acceleration without excessive drive current. Overall mass is 3.2 kg, permitting installation on medium-sized axes that accept a NEMA 34 flange. There is no brake, no shaft seal, and no secondary feedback device, so holding torque during power loss and protection against fluid ingress must be provided externally.
