S31HNAA-RNNE-00 Pacific Scientific
Wake Industrial LLC is not an authorized distributor of this product.
The Pacific Scientific S31HNAA-RNNE-00 is a 6-pole Neodymium magnet brushless servo motor from the S Brushless Motors series. This NEMA 34 frame motor offers a continuous stall torque of 2.2 Nm and peak torque of 6.2 Nm. It features a size 21 frameless resolver as its primary feedback device and weighs 3.2 kilograms.
Internal Product Review
The Pacific Scientific S31HNAA-RNNE-00 is a 6-pole neodymium magnet brushless servo motor in a NEMA 34 frame. Continuous stall torque of 2.2 Nm and peak torque of 6.2 Nm give the motor strong low-speed authority and responsive acceleration in servo applications. A size 21 frameless resolver and 24 Vdc holding brake make this model especially attractive for precise axis control.
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Product Description:
The S31HNAA-RNNE-00 is a brushless servo motor produced by Pacific Scientific within the S Brushless Motors series. Classified as a six-pole neodymium-magnet brushless servo motor, it converts controlled current from a drive into rotary motion for indexing tables, pick-and-place axes, and other industrial automation tasks that demand accurate torque and speed regulation. A NEMA-frame mechanical footprint allows the unit to fit standard motor brackets without custom adapters.
Under continuous load, the motor delivers 2.2 Nm of stall torque, allowing it to hold that load without exceeding its rated temperature. For short acceleration bursts, it supplies up to 6.2 Nm, providing additional torque for overcoming system inertia. Each ampere of phase current produces 0.7 Nm/ARMS, a torque constant that simplifies drive tuning. Electrical response is influenced by a phase inductance of 10.3 mH, which filters current ripple, and a line-to-line resistance of 4.1 ohms, which contributes to copper losses during operation. The H winding code pairs these electrical values with a voltage constant of 0.44 VRMS/rad/s, allowing the motor to reach rated speed with common 120/240 V servo amplifiers. The housing conforms to the NEMA 34 frame size, allowing direct coupling to compatible gearheads or lead screws.
The integrated 24 V DC brake locks the shaft when power is removed, preventing back-driving on vertical axes. Rotor inertia is 0.18 × 10⁻³ kg·m², a low value that supports fast start-and-stop cycles when paired with the single-stack magnetic length. Overall mass is 3.2 kg, which supports installation on moving gantries without adding excessive weight. The motor is built without a shaft seal, so it should be installed in dry environments where the shaft opening is protected from moisture and contaminants. A size 21 frameless resolver provides rotor feedback, and the motor does not include a secondary feedback device. Intercontec connectors provide quick cable termination, while the NEMA mounting face maintains compatibility with standard brackets and the one-stack stator minimizes the motor’s overall depth.
