Product Description:

The S33GNNA-RNVM-00 is a brushless servo motor manufactured by Pacific Scientific as part of the S Brushless Motors series. Built around a 6-pole neodymium magnet rotor, it converts precisely metered stator current into rotary motion for pick-and-place heads, indexing tables, and other axes that demand repeatable positioning. Integrated into a drive system, the motor provides bidirectional speed control and rapid acceleration while fitting the NEMA 34 frame size often found on legacy machinery. Its brushless construction supports clean operation and steady response in automated equipment that runs through frequent start-stop cycles.

At the shaft, the motor delivers a continuous stall torque of 5.3 Nm, and short-duty surges can reach a peak of 15.3 Nm for rapid indexing moves. Output is linearly related to a torque constant of 1.9 Nm/ARMS, while the generated back EMF follows a voltage constant of 1.19 VRMS/rad/sec; together, these values help match the motor to a compatible servo amplifier. A rotor inertia of 0.48 × 10⁻³ kg·m² supports fast reversals, and the three-stack G winding increases copper fill without enlarging the frame. Position data is supplied by a size 21 frameless resolver mounted on the rear housing, allowing closed-loop control through a single primary feedback device.

Electrically, the phase inductance is 25.2 mH line to line, and the winding resistance is 8.4 Ω; together they influence current rise time and copper loss during high-frequency servo cycles. The motor mass of 6.5 kg suits slide or gantry installations, and mounting follows the standard NEMA bolt pattern for this frame class. A Viton shaft seal protects the front bearing from coolant splash, and power plus resolver leads terminate through a motor-mounted MS connector for a compact external connection point. The design is supplied without a holding brake and without a secondary feedback device, so static load retention must be handled elsewhere when the axis is stopped.