Product Description:

The S31HSNA-RNNM-03 belongs to the S Brushless Motors series produced by Pacific Scientific. It is a 6-pole neodymium-magnet brushless servo motor designed for industrial automation tasks that require precise position and speed control. By pairing the magnetic rotor with stator windings driven by a servo amplifier, the unit supplies rotational energy to linear actuators, indexing tables, and material-handling axes where rapid acceleration and repeatable motion are required.

The motor delivers a continuous stall torque of 2.2 Nm, giving machinery a steady holding capability without overheating, while its peak torque reaches 6.2 Nm for brief acceleration or load-surge events. A frame size of NEMA 34 sets its mounting pattern, so it fits standard 3.4-inch square flanges often found on medium-power stages. Electrical behavior is influenced by a line-to-line inductance of 10.3 mH, which limits current rise and smooths converter pulses, and by a phase resistance of 4.1 ohms, which contributes to copper losses. These values match the motor's H winding code and support drive voltage selection for 240 V class servo amplifiers.

Dynamic response is supported by a rotor inertia of 0.18 × 10⁻³ kg·m², which helps reduce mechanical lag, and by a torque constant of 0.7 Nm/ARMS, which links commanded current to produced torque for closed-loop control. The back-EMF voltage constant is 0.44 VRMS/rad/sec, which supports drive commutation algorithms, and the overall mass is 3.2 kg, which eases integration on moving carriages. Feedback comes from a Size 21 frameless resolver, and no secondary feedback is provided. The shaft end is supplied without a shaft seal, and the motor is shipped without a brake, so external holding methods must be used when power is off. The motor uses a single-stack lamination and a motor-mounted MS connector.