Product Description:

The S34GNNA-RNNM-00 is a Pacific Scientific servo unit in the S Brushless Motors series. It is a 6-pole Neodymium magnet brushless motor built to deliver controlled rotary power to automated machinery such as gantry axes, indexing tables, and material-handling actuators. A size 21 frameless resolver supplies primary feedback to the drive so the position and velocity loops remain closed during operation. The motor follows the NEMA frame mounting convention and is supplied without a holding brake or shaft seal, which suits installations that already use external braking or separate sealing at the machine interface.

At the shaft, this model can maintain a continuous stall torque of 6.6 Nm, while short bursts up to 25.3 Nm are available for acceleration or shock loads. Each ampere of RMS phase current produces about 2.1 Nm/ARMS of torque, which helps match the motor to the drive and load requirements. The three-phase stator windings have a line-to-line resistance of 7.2 Ω, and this affects copper loss during sustained duty. The windings also have a line-to-line inductance of 23.7 mH, which helps smooth current ripple and influences how quickly the drive can change phase current during dynamic motion.

Mechanical inertia is limited to 0.64 × 10⁻³ kg·m², so the rotor responds quickly to torque changes without making lightly loaded axes harder to control. Back EMF develops at 1.32 VRMS / rad / sec, which the controller can use when estimating motor behavior at higher speed. With a motor weight of 8.1 kg, the unit offers a favorable torque-to-mass ratio for mobile or cantilevered axes. The housing fits the NEMA 34 frame envelope, and both power and resolver leads exit through a motor-mounted MS connector for quick connection on standardized machine layouts.